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Chang F, Wang Y, Zhang J, Tu T, Luo H, Huang H, Bai Y, Qin X, Wang Y, Yao B, Wang Y, Wang X. Efficient production of γ-aminobutyric acid using engineered Escherichia coli whole-cell catalyst. Enzyme Microb Technol 2024; 174:110379. [PMID: 38103484 DOI: 10.1016/j.enzmictec.2023.110379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 12/07/2023] [Accepted: 12/11/2023] [Indexed: 12/19/2023]
Abstract
γ-Aminobutyric acid (GABA) has been widely used in the food, feed, pharmaceutical, and chemical industry fields. Previously, we developed a whole-cell catalyst capable of converting L-glutamate (L-Glu) into GABA by overexpressing the glutamate decarboxylase gene (gadz11) from Bacillus sp. Z11 in Escherichia coli BL21(DE3). However, to enhance cell permeability, a freeze-thaw treatment is required, and to enhance GADZ11 activity, pyridoxal 5'-phosphate (PLP) must be added to the reaction system. The aim of this study is to provide a more efficient approach for GABA production by engineering the recombinant E. coli above. First, the inducible expression conditions of the gadz11 in E. coli were optimized to 37 °C for 6 h. Next, an ideal engineered strain was produced via increasing cell permeability by overexpressing sulA and eliminating PLP dependence by constructing a self-sufficient system. Furthermore, an efficient whole-cell biocatalytic process was optimized. The optimal substrate concentration, cell density, and reaction temperature were 1.0 mol/L (the molecular ratio of L-Glu to L-monosodium glutamate (L-MSG) was 4:1), 15 and 37 °C, respectively. Finally, a whole-cell bioconversion procedure was performed in a 3-L bioreactor under optimal conditions. The strain could be reused for at least two cycles with GABA yield, productivity and conversion ratio of 206.2 g/L, 117.8 g/L/h and 100.0%, respectively. This is currently the highest GABA productivity from a mixture of L-Glu and L-MSG reported without the addition of cofactors or additional treatment of cells. This work demonstrates that the novel engineered E. coli strain has the potential for application in large-scale industrial GABA production.
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Affiliation(s)
- Fangfang Chang
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Yuheng Wang
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Jie Zhang
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Tao Tu
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Huiying Luo
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Huoqing Huang
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Yingguo Bai
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Xing Qin
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Yaru Wang
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Bin Yao
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Yuan Wang
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
| | - Xiaolu Wang
- State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
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Anfimova PA, Pankrasheva LG, Emanuilov AI, Moiseev KY, Maslyukov PM. Expression of GAD65/67 and VGLUT2 in Mediobasal Nuclei of Rat Hypothalamus during Aging. Bull Exp Biol Med 2023; 176:232-234. [PMID: 38194067 DOI: 10.1007/s10517-024-06001-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Indexed: 01/10/2024]
Abstract
The expression of glutamate decarboxylase GAD65/67, an enzyme of GABA synthesis, and vesicular glutamate transporter 2 (VGLUT2) in the arcuate, dorsomedial, and ventromedial nuclei of the hypothalamus of young (3 months), adult (12 months), and old male rats (24 months) was studied by Western blotting. In old rats, an increase in the expression of GAD65/67 in the arcuate and dorsomedial, VGLUT2 in the arcuate, dorsomedial, and ventromedial nuclei was observed. Thus, an increase in opposite processes of inhibition and excitation is observed in the hypothalamic nuclei during aging.
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Affiliation(s)
- P A Anfimova
- Yaroslavl State Medical University, Ministry of Health of the Russian Federation, Yaroslavl, Russia
| | - L G Pankrasheva
- Yaroslavl State Medical University, Ministry of Health of the Russian Federation, Yaroslavl, Russia
| | - A I Emanuilov
- Yaroslavl State Medical University, Ministry of Health of the Russian Federation, Yaroslavl, Russia
| | - K Yu Moiseev
- Yaroslavl State Medical University, Ministry of Health of the Russian Federation, Yaroslavl, Russia
| | - P M Maslyukov
- Yaroslavl State Medical University, Ministry of Health of the Russian Federation, Yaroslavl, Russia.
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Ivlev AP, Naumova AA. Postnatal development of the hippocampal GABAergic system in rats genetically prone to audiogenic seizures. Int J Dev Neurosci 2023; 83:703-714. [PMID: 37655366 DOI: 10.1002/jdn.10298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 07/24/2023] [Accepted: 07/26/2023] [Indexed: 09/02/2023] Open
Abstract
Epileptogenesis can be associated with altered genetic control of the GABAergic system. Here we analyzed Krushinsky-Molodkina (KM) rats genetically prone to audiogenic epilepsy. KM rats express fully formed audiogenic seizures (AGSs) not early, then they reach 3 months. At the age of 1-2 months, KM rats either do not express AGS or demonstrate an incomplete pattern of seizure. Such long-term development of AGS susceptibility makes KM rats an especially convenient model to investigate the mechanisms and dynamics of the development of inherited epilepsy. The analysis of the GABAergic system of the hippocampus of KM rats was done during postnatal development at the 15th, 60th, and 120th postnatal days. Wistar rats of corresponding ages were used as a control. In the hippocampus of KM pups, we observed a decrease in the expression of glutamic acid decarboxylase 67 (GAD67) and parvalbumin (PV), which points to a decrease in the activity of GABAergic neurons. Analysis of the 2-month-old KM rats showed an increase in GAD67 and PV expression while synapsin I and vesicular GABA transporter (VGAT) were decreased. In adult KM rats, the expression of GAD67, PV, and synapsin I was upregulated. Altogether, the obtained data indicate significant alterations in GABAergic transmission in the hippocampus of audiogenic KM rats during the first postnatal months.
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Affiliation(s)
- Andrey P Ivlev
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, Russia
| | - Alexandra A Naumova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, Russia
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Benidickson KH, Raytek LM, Hoover GJ, Flaherty EJ, Shelp BJ, Snedden WA, Plaxton WC. Glutamate decarboxylase-1 is essential for efficient acclimation of Arabidopsis thaliana to nutritional phosphorus deprivation. New Phytol 2023; 240:2372-2385. [PMID: 37837235 DOI: 10.1111/nph.19300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 09/15/2023] [Indexed: 10/15/2023]
Abstract
Glutamate decarboxylase (GAD) is a Ca2+ -calmodulin-activated, cytosolic enzyme that produces γ-aminobutyrate (GABA) as the committed step of the GABA shunt. This pathway bypasses the 2-oxoglutarate to succinate reactions of the tricarboxylic acid (TCA) cycle. GABA also accumulates during many plant stresses. We tested the hypothesis that AtGAD1 (At5G17330) facilitates Arabidopsis acclimation to Pi deprivation. Quantitative RT-PCR and immunoblotting revealed that AtGAD1 transcript and protein expression is primarily root-specific, but inducible at lower levels in shoots of Pi-deprived (-Pi) plants. Pi deprivation reduced levels of the 2-oxoglutarate dehydrogenase (2-OGDH) cofactor thiamine diphosphate (ThDP) in shoots and roots by > 50%. Growth of -Pi atgad1 T-DNA mutants was significantly attenuated relative to wild-type plants. This was accompanied by: (i) an > 60% increase in shoot and root GABA levels of -Pi wild-type, but not atgad1 plants, and (ii) markedly elevated anthocyanin and reduced free and total Pi levels in leaves of -Pi atgad1 plants. Treatment with 10 mM GABA reversed the deleterious development of -Pi atgad1 plants. Our results indicate that AtGAD1 mediates GABA shunt upregulation during Pi deprivation. This bypass is hypothesized to circumvent ThDP-limited 2-OGDH activity to facilitate TCA cycle flux and respiration by -Pi Arabidopsis.
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Affiliation(s)
| | - Lee Marie Raytek
- Department of Biology, Queen's University, Kingston, ON, K7L 3N6, Canada
| | - Gordon J Hoover
- Department of Plant Agriculture, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Edward J Flaherty
- Department of Plant Agriculture, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Barry J Shelp
- Department of Plant Agriculture, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Wayne A Snedden
- Department of Biology, Queen's University, Kingston, ON, K7L 3N6, Canada
| | - William C Plaxton
- Department of Biology, Queen's University, Kingston, ON, K7L 3N6, Canada
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Sirchi MM, Motaghi S, Hosseininasab NS, Abbasnejad M, Esmaili-Mahani S, Sepehri G. Age-related changes in glutamic acid decarboxylase 1 gene expression in the medial prefrontal cortex and ventral hippocampus of fear-potentiated rats subjected to isolation stress. Behav Brain Res 2023; 453:114630. [PMID: 37586565 DOI: 10.1016/j.bbr.2023.114630] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/10/2023] [Accepted: 08/13/2023] [Indexed: 08/18/2023]
Abstract
Gamma-aminobutyric acid (GABA) plays a crucial role as a neurotransmitter in anxiety circuits, prominently in the hippocampus, amygdala, and prefrontal cortex. The synthesis of GABA in the central nervous system is primarily governed by glutamic acid decarboxylase 67 (GAD67). Aging is associated with emotional alterations, and isolation stress has been linked to increased anxiety. This study aimed to investigate the impact of aging on the gene expression of GAD67 (Gad1) in the medial prefrontal cortex (m PC) and ventral hippocampus (v Hip) of fear-potentiated rats subjected to isolation stress. To conduct the study, Wistar rats of different age groups 21-day-old (immature), 42-day-old (peri-adolescent), and 365-day-old (mature adult) were utilized. Each age level was categorized into four groups: 1) Control group - no pre-stressor, no maze, no drug, 2) Innate fear group (M) - no pre-stressor, maze, no drug, 3) Fear-potentiated group (IM) - isolation pre-stressor for 120 min, maze, no drug, and 4) Diazepam-treated group (IMD) - isolation pre-stressor for 120 min, maze, and diazepam administration. Following the tests, the (m PC) and (v Hip) regions were dissected, and Gad1 gene expression changes were assessed using Real-time PCR technique. The results revealed that, across all age groups, Gad1 expression in both the (m PC) and (v Hip) was significantly higher in the fear-potentiated groups (IM) compared to the control and innate fear (M) groups. Notably, in aged 365-day-old rats from the innate fear group (M), the expression of Gad1 in (v Hip) was also higher than that in the control group. Additionally, aged fear-potentiated rats exhibited elevated Gad1 gene expression in both structures compared to other age groups. These findings suggest that isolation stress before exposure to the elevated plus maze (EPM) can elevate Gad1 gene expression in both the (v Hip) and (m PC), and age may play a role in modulating its expression.
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Affiliation(s)
- Mahya Moradi Sirchi
- Department of Basic Sciences, Faculty of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Sahel Motaghi
- Department of Basic Sciences, Faculty of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran.
| | - Narges Sadat Hosseininasab
- Department of Basic Sciences, Faculty of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Mehdi Abbasnejad
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Saeed Esmaili-Mahani
- Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
| | - Gholamreza Sepehri
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
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Dowling KF, Dienel SJ, Barile Z, Bazmi HH, Lewis DA. Localization and Diagnostic Specificity of Glutamic Acid Decarboxylase Transcript Alterations in the Dorsolateral Prefrontal Cortex in Schizophrenia. Biol Psychiatry 2023; 94:322-331. [PMID: 37061080 PMCID: PMC10524522 DOI: 10.1016/j.biopsych.2023.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/24/2023] [Accepted: 04/03/2023] [Indexed: 04/17/2023]
Abstract
BACKGROUND Working memory (WM) deficits in schizophrenia are thought to reflect altered inhibition in the dorsolateral prefrontal cortex (DLPFC). This interpretation is supported by findings of lower transcript levels of the 2 enzymes, GAD67 and GAD65, which mediate basal and activity-dependent GABA (gamma-aminobutyric acid) synthesis, respectively. However, the relative magnitude, location within the depth of the DLPFC, and specificity to the disease process of schizophrenia of alterations in GAD67 and/or GAD65 remain unclear. METHODS Levels of GAD67 and GAD65 messenger RNAs (mRNAs) in superficial (layers 2/superficial 3) and deep (deep layer 6/white matter) zones of the DLPFC were quantified by quantitative polymerase chain reaction in subjects with schizophrenia (n = 41), major depression (n = 42), or bipolar disorder (n = 39) and unaffected comparison (n = 43) subjects. RESULTS Relative to the unaffected comparison group, GAD67 and GAD65 mRNA levels in the schizophrenia group were lower (p = .039, effect size = -0.69 and p = .027, effect size = -0.72, respectively) in the superficial zone but were unaltered in the deep zone. In the major depression group, only GAD67 mRNA levels were lower and only in the superficial zone (p = .089, effect size = 0.70). No differences were detected in the bipolar disorder group. Neither GAD67 nor GAD65 mRNA alterations were explained by psychosis, mood disturbance, or common comorbid factors. CONCLUSIONS Alterations in markers of GABA synthesis demonstrated transcript, DLPFC zone, and diagnostic specificity. Given the dependence of WM on GABA neurotransmission in the superficial DLPFC, our findings suggest that limitations to GABA synthesis in this location contribute to WM impairments in schizophrenia, especially during demanding WM tasks, when GABA synthesis requires the activity of both GAD67 and GAD65.
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Affiliation(s)
- Kevin F Dowling
- Medical Scientist Training Program, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; Translational Neuroscience Program, Department of Psychiatry, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Neuroscience, Dietrich School of Arts and Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Samuel J Dienel
- Medical Scientist Training Program, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; Translational Neuroscience Program, Department of Psychiatry, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Neuroscience, Dietrich School of Arts and Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania; Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, Pennsylvania
| | - Zackery Barile
- Translational Neuroscience Program, Department of Psychiatry, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - H Holly Bazmi
- Translational Neuroscience Program, Department of Psychiatry, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - David A Lewis
- Translational Neuroscience Program, Department of Psychiatry, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; Department of Neuroscience, Dietrich School of Arts and Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania; Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, Pennsylvania.
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García E. Two putative glutamate decarboxylases of Streptococcus pneumoniae as possible antigens for the production of anti-GAD65 antibodies leading to type 1 diabetes mellitus. Int Microbiol 2023; 26:675-690. [PMID: 37154976 PMCID: PMC10165594 DOI: 10.1007/s10123-023-00364-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 04/13/2023] [Accepted: 04/21/2023] [Indexed: 05/10/2023]
Abstract
Type 1 diabetes mellitus (T1DM) has been increasing in prevalence in the last decades and has become a global burden. Autoantibodies against human glutamate decarboxylase (GAD65) are among the first to be detected at the onset of T1DM. Diverse viruses have been proposed to be involved in the triggering of T1DM because of molecular mimicry, i.e., similarity between parts of some viral proteins and one or more epitopes of GAD65. However, the possibility that bacterial proteins might also be responsible for GAD65 mimicry has been seldom investigated. To date, many genomes of Streptococcus pneumoniae (the pneumococcus), a prominent human pathogen particularly prevalent among children and the elderly, have been sequenced. A dataset of more than 9000 pneumococcal genomes was mined and two different (albeit related) genes (gadA and gadB), presumably encoding two glutamate decarboxylases similar to GAD65, were found. The various gadASpn alleles were present only in serotype 3 pneumococci belonging to the global lineage GPSC83, although some homologs have also been discovered in two subspecies of Streptococcus constellatus (pharyngis and viborgensis), an isolate of the group B streptococci, and several strains of Lactobacillus delbrueckii. Besides, gadBSpn alleles are present in > 10% of the isolates in our dataset and represent 16 GPSCs with 123 sequence types and 20 different serotypes. Sequence analyses indicated that gadA- and gadB-like genes have been mobilized among different bacteria either by prophage(s) or by integrative and conjugative element(s), respectively. Substantial similarities appear to exist between the putative pneumococcal glutamate decarboxylases and well-known epitopes of GAD65. In this sense, the use of broader pneumococcal conjugate vaccines such as PCV20 would prevent the majority of serotypes expressing those genes that might potentially contribute to T1DM. These results deserve upcoming studies on the possible involvement of S. pneumoniae in the etiopathogenesis and clinical onset of T1DM.
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Affiliation(s)
- Ernesto García
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas Margarita Salas (CSIC), Ramiro de Maeztu 9, 28040, Madrid, Spain.
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Fang X, Zhang Y, Guo Q, Yuan M, Liang X, Liu J, Fang S, Yang Y, Fang C. GadR4 mediates the acid resistance and pathogenicity of Listeria monocytogenes 10403S by negatively regulating the gadT2/gadD2 cluster. Food Microbiol 2023; 112:104248. [PMID: 36906312 DOI: 10.1016/j.fm.2023.104248] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 01/29/2023] [Accepted: 02/23/2023] [Indexed: 03/06/2023]
Abstract
Listeria monocytogenes is an important foodborne pathogen that can survive under acidic conditions. The glutamate decarboxylase (GAD) system is one of the acid resistance systems of L. monocytogenes. It usually comprises two glutamate transporters (GadT1/T2) and three glutamate decarboxylases (GadD1/D2/D3). Among them, gadT2/gadD2 contributes most significantly to the acid resistance of L. monocytogenes. However, the regulation mechanisms of gadT2/gadD2 still remain unclear. The results of this study indicated that gadT2/gadD2 deletion significantly decreases the survival rate of L. monocytogenes under different acidic conditions, including brain and heart infusion (BHI) broth, with a pH of 2.5, 2% citric acid, 2% acetic acid and 2% lactic acid. Further, gadT2/gadD2 cluster was expressed in the representative strains in response to alkaline stress rather than acid stress. To explore the regulation of gadT2/gadD2, we knocked out the five transcriptional factors belonging to the Rgg family in L. monocytogenes 10403S. We found that the deletion of gadR4, which exhibits the highest homology with the gadR of Lactococcus lactis, resulted in a significant increase in the survival rate of L. monocytogenes upon acid stress. Western blot analysis showed that gadR4 deletion significantly increased the gadD2 expression of L. monocytogenes under alkaline and neutral conditions. Furthermore, the gfp reporter gene showed that gadR4 deletion significantly increased the expression of the gadT2/gadD2 cluster. Adhesion and invasion assays indicated that gadR4 deletion significantly increased the rates of adhesion and invasion of L. monocytogenes to epithelial Caco-2 cells. Virulence assays showed that gadR4 knockout significantly improved the colonization ability of L. monocytogenes in the livers and spleens of the infected mice. Taken together, our results showed that GadR4, a transcription factor belonging to the Rgg family, negatively regulates the gadT2/gadD2 cluster, thus, reducing the acid stress tolerance and pathogenicity of L. monocytogens 10403S. Our results provide a better understanding of the regulation of the GAD system of L. monocytogenes and a novel approach to potentially prevent and control listeriosis.
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Affiliation(s)
- Xiaowei Fang
- College of Animal Science, Yangtze University, No.88, Jingmi Road, Jingzhou, 434025, China; College of Agriculture, Yangtze University, No.88, Jingmi Road, Jingzhou, 434025, China
| | - Yu Zhang
- College of Animal Science, Yangtze University, No.88, Jingmi Road, Jingzhou, 434025, China
| | - Qian Guo
- College of Animal Science, Yangtze University, No.88, Jingmi Road, Jingzhou, 434025, China
| | - Mei Yuan
- College of Animal Science, Yangtze University, No.88, Jingmi Road, Jingzhou, 434025, China
| | - Xiongyan Liang
- College of Animal Science, Yangtze University, No.88, Jingmi Road, Jingzhou, 434025, China
| | - Jing Liu
- College of Animal Science, Yangtze University, No.88, Jingmi Road, Jingzhou, 434025, China
| | - Shouguo Fang
- College of Agriculture, Yangtze University, No.88, Jingmi Road, Jingzhou, 434025, China
| | - Yuying Yang
- College of Animal Science, Yangtze University, No.88, Jingmi Road, Jingzhou, 434025, China
| | - Chun Fang
- College of Animal Science, Yangtze University, No.88, Jingmi Road, Jingzhou, 434025, China.
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Yang X, Huo X, Tang Y, Zhao M, Tao Y, Huang J, Ke C. Integrating Enzyme Evolution and Metabolic Engineering to Improve the Productivity of Γ-Aminobutyric Acid by Whole-Cell Biosynthesis in Escherichia Coli. J Agric Food Chem 2023; 71:4656-4664. [PMID: 36881553 DOI: 10.1021/acs.jafc.2c07613] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
γ-Aminobutyric acid (GABA) is used widely in various fields, such as agriculture, food, pharmaceuticals, and biobased chemicals. Based on glutamate decarboxylase (GadBM4) derived from our previous work, three mutants, GadM4-2, GadM4-8, and GadM4-31, were obtained by integrating enzyme evolution and high-throughput screening methods. The GABA productivity obtained through whole-cell bioconversion using recombinant Escherichia coli cells harboring mutant GadBM4-2 was enhanced by 20.27% compared to that of the original GadBM4. Further introduction of the central regulator GadE of the acid resistance system and the enzymes from the deoxyxylulose-5-phosphate-independent pyridoxal 5'-phosphate biosynthesis pathway resulted in a 24.92% improvement in GABA productivity, reaching 76.70 g/L/h without any cofactor addition with a greater than 99% conversion ratio. Finally, when one-step bioconversion was applied for the whole-cell catalysis in a 5 L bioreactor, the titer of GABA reached 307.5 ± 5.94 g/L with a productivity of 61.49 g/L/h by using crude l-glutamic acid (l-Glu) as the substrate. Thus, the biocatalyst constructed above combined with the whole-cell bioconversion method represents an effective approach for industrial GABA production.
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Affiliation(s)
- Xinwei Yang
- National and Local United Engineering Research Center of Industrial Microbiology and Fermentation Technology; College of Life Sciences, Fujian Normal University, Fuzhou 350117, Fujian, People's Republic of China
| | - Xiaojing Huo
- CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, No. 1 West Beichen Road, Chaoyang District, Beijing 100101, China
| | - Yaqian Tang
- National and Local United Engineering Research Center of Industrial Microbiology and Fermentation Technology; College of Life Sciences, Fujian Normal University, Fuzhou 350117, Fujian, People's Republic of China
| | - Mingyue Zhao
- National and Local United Engineering Research Center of Industrial Microbiology and Fermentation Technology; College of Life Sciences, Fujian Normal University, Fuzhou 350117, Fujian, People's Republic of China
| | - Yong Tao
- CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, No. 1 West Beichen Road, Chaoyang District, Beijing 100101, China
| | - Jianzhong Huang
- National and Local United Engineering Research Center of Industrial Microbiology and Fermentation Technology; College of Life Sciences, Fujian Normal University, Fuzhou 350117, Fujian, People's Republic of China
| | - Chongrong Ke
- National and Local United Engineering Research Center of Industrial Microbiology and Fermentation Technology; College of Life Sciences, Fujian Normal University, Fuzhou 350117, Fujian, People's Republic of China
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Lu M, He X, Jiao Z, Hu Z, Guo Z, Dai S, Wang H, Xu D. The upregulation of glutamate decarboxylase 67 against hippocampal excitability damage in male fetal rats by prenatal caffeine exposure. Environ Toxicol 2022; 37:2703-2717. [PMID: 35917217 DOI: 10.1002/tox.23630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 06/25/2022] [Accepted: 07/13/2022] [Indexed: 06/15/2023]
Abstract
As a kind of xanthine alkaloid, caffeine is widely present in beverages, food, and analgesic drugs. Our previous studies have shown that prenatal caffeine exposure (PCE) can induce programmed hypersensitivity of the hypothalamic-pituitary-adrenal (HPA) axis in offspring rats, which is involved in developing many chronic adult diseases. The present study further examined the potential molecular mechanism and toxicity targets of hippocampal dysfunction, which might mediate the programmed hypersensitivity of the HPA axis in offspring. Pregnant rats were intragastrically administered with 0, 30, and 120 mg/kg/day caffeine from gestational days (GD) 9-20, and the fetal rats were extracted at GD20. Rat fetal hippocampal H19-7/IGF1R cell line was treated with caffeine, adenosine A2A receptor (A2AR) agonist (CGS-21680) or adenylate cyclase agonist (forskolin) plus caffeine. Compared with the control group, hippocampal neurons of male fetal rats by PCE displayed increased apoptosis and reduced synaptic plasticity, whereas glutamate decarboxylase 67 (GAD67) expression was increased. Moreover, the expression of A2AR was down-regulated, PCE inhibited the cAMP/PKA/CREB/BDNF/TrkB pathway. Furthermore, the results in vitro were consistent with the in vivo study. Both CGS21680 and forskolin could reverse the above alteration caused by caffeine. These results indicated that PCE inhibits the BDNF pathway and mediates the hippocampus's glutamate (Glu) excitotoxicity. The compensatory up-regulation of GAD67 unbalanced the Glu/gamma-aminobutyric acid (GABA)ergic output, leading to the impaired negative feedback to the hypothalamus and hypersensitivity of the HPA axis.
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Affiliation(s)
- Mengxi Lu
- Department of Pharmacology, School of Pharmaceutical Sciences, Wuhan University, Wuhan, China
| | - Xia He
- Department of Pharmacology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Zhexiao Jiao
- Department of Pharmacology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Zewen Hu
- Department of Pharmacology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Zijing Guo
- Department of Pharmacology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Shiyun Dai
- Department of Pharmacology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
| | - Hui Wang
- Department of Pharmacology, School of Basic Medical Sciences, Wuhan University, Wuhan, China
- Hubei Provincial Key Laboratory of Developmentally Originated Disease, Wuhan, China
| | - Dan Xu
- Department of Pharmacology, School of Pharmaceutical Sciences, Wuhan University, Wuhan, China
- Hubei Provincial Key Laboratory of Developmentally Originated Disease, Wuhan, China
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11
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Ali MH, Alshamrani AA, Napit PR, Briski KP. Single-cell multiplex qPCR evidence for sex-dimorphic glutamate decarboxylase, estrogen receptor, and 5'-AMP-activated protein kinase alpha subunit mRNA expression by ventromedial hypothalamic nucleus GABAergic neurons. J Chem Neuroanat 2022; 124:102132. [PMID: 35772680 PMCID: PMC9474596 DOI: 10.1016/j.jchemneu.2022.102132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/20/2022] [Accepted: 06/24/2022] [Indexed: 12/01/2022]
Abstract
The inhibitory amino acid transmitter γ-aminobutryic acid (GABA) acts within the ventromedial hypothalamus to regulate systemic glucose homeostasis, but the issue of whether this neurochemical signal originates locally or is supplied by afferent innervation remains controversial. Here, combinatory in situ immunocytochemistry/laser-catapult microdissection/single-cell multiplex qPCR techniques were used to investigate the premise that ventromedial hypothalamic nucleus ventrolateral (VMNvl) and/or dorsomedial (VMNdm) division neurons contain mRNAs that encode glutamate decarboxylase (GAD)65 or GAD67 and metabolic-sensory biomarkers, and that expression of these genes is sex-dimorphic. In male and female rats, GAD65 mRNA was elevated in VMNvl versus VMNdm GAD65/67-immunopositive (-ir) neurons, yet the female exhibited higher GAD67 transcript content in VMNdm versus VMNvl GABAergic nerve cells. Estrogen receptor (ER)-alpha transcripts were lower in female versus male GABA neurons from either VMN division; ER-beta and G-protein-coupled ER-1 mRNA expression profiles were also comparatively reduced in cells from female versus male VMNvl. VMNvl and VMNdm GAD65/67-ir-positive neurons showed equivalent levels of glucokinase and sulfonylurea receptor-1 mRNA between sexes. 5'-AMP-activated protein kinase-alpha 1 (AMPKα1) and -alpha 2 (AMPKα2) transcripts were lower in female versus male VMNdm GABAergic neurons, yet AMPKα2 mRNA levels were higher in cells acquired from female versus male VMNvl. Current studies document GAD65 and -67 gene expression in VMNvl and VMNdm GAD65/67-ir-positive neurons in each sex. Results infer that GABAergic neurons in each division may exhibit sex differences in receptiveness to estradiol. Outcomes also support the prospect that energy sensory function by this neurotransmitter cell type may predominate in the VMNvl in female versus VMNdm in the male.
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Affiliation(s)
- Md Haider Ali
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, Monroe, LA 71201, USA
| | - Ayed A Alshamrani
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, Monroe, LA 71201, USA
| | - Prabhat R Napit
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, Monroe, LA 71201, USA
| | - Karen P Briski
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, Monroe, LA 71201, USA.
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12
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Liu Y, Zhu L, Yang M, Xie X, Sun P, Fang C, Zhao J. R2R3-MYB transcription factor FaMYB5 is involved in citric acid metabolism in strawberry fruits. J Plant Physiol 2022; 277:153789. [PMID: 35995002 DOI: 10.1016/j.jplph.2022.153789] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 07/01/2022] [Accepted: 07/31/2022] [Indexed: 06/15/2023]
Abstract
The citrate content of strawberry fruits affects their organoleptic quality. However, little is known about the transcriptional regulatory mechanisms of citric acid metabolism in strawberry fruits. In this study, the R2R3-MYB transcription factor FaMYB5 was identified and placed in the R2R3-MYB subfamily. FaMYB5 is found in the nucleus and shows tissue- and stage-specific expression levels. Citric acid content was positively correlated with FaMYB5 transcript levels. Upregulated FaMYB5 increased citric acid accumulation in transient FaMYB5-overexpressing strawberry fruits, whereas transient RNA silencing of FaMYB5 in strawberry fruits resulted in a reduction of citric acid content. The role of FaMYB5 was verified using stable transgenic NC89 tobacco. Furthermore, a yeast one-hybrid assay revealed that FaMYB5 influences citric acid accumulation by binding to the FaACO (aconitase), FaGAD (glutamate decarboxylase), and FaCS2 (citrate synthase) promoters. Dual-luciferase assays were used to demonstrate that FaMYB5 could activate FaCS2 expression and repress the transcription levels of FaACO and FaGAD. This study identified important roles of FaMYB5 in the regulation of citric acid metabolism and provided a potential target for improving strawberry fruit taste in horticultural crops.
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Affiliation(s)
- Yaxin Liu
- School of Horticulture, Anhui Agricultural University, Hefei, 230036, China
| | - Lin Zhu
- School of Horticulture, Anhui Agricultural University, Hefei, 230036, China
| | - Mingjun Yang
- School of Horticulture, Anhui Agricultural University, Hefei, 230036, China
| | - Xingbin Xie
- School of Horticulture, Anhui Agricultural University, Hefei, 230036, China
| | - Peipei Sun
- School of Horticulture, Anhui Agricultural University, Hefei, 230036, China
| | - Congbing Fang
- School of Horticulture, Anhui Agricultural University, Hefei, 230036, China.
| | - Jing Zhao
- School of Horticulture, Anhui Agricultural University, Hefei, 230036, China.
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13
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Bedi S, Richardson TM, Jia B, Saab H, Brinkman FSL, Westley M. Similarities between bacterial GAD and human GAD65: Implications in gut mediated autoimmune type 1 diabetes. PLoS One 2022; 17:e0261103. [PMID: 35196314 PMCID: PMC8865633 DOI: 10.1371/journal.pone.0261103] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 01/21/2022] [Indexed: 12/25/2022] Open
Abstract
A variety of islet autoantibodies (AAbs) can predict and possibly dictate eventual type 1 diabetes (T1D) diagnosis. Upwards of 75% of those with T1D are positive for AAbs against glutamic acid decarboxylase (GAD65 or GAD), a producer of gamma-aminobutyric acid (GABA) in human pancreatic beta cells. Interestingly, bacterial populations within the human gut also express GAD and produce GABA. Evidence suggests that dysbiosis of the microbiome may correlate with T1D pathogenesis and physiology. Therefore, autoimmune linkages between the gut microbiome and islets susceptible to autoimmune attack need to be further elucidated. Utilizing in silico analyses, we show that 25 GAD sequences from human gut bacterial sources show sequence and motif similarities to human beta cell GAD65. Our motif analyses determined that most gut GAD sequences contain the pyroxical dependent decarboxylase (PDD) domain of human GAD65, which is important for its enzymatic activity. Additionally, we showed overlap with known human GAD65 T cell receptor epitopes, which may implicate the immune destruction of beta cells. Thus, we propose a physiological hypothesis in which changes in the gut microbiome in those with T1D result in a release of bacterial GAD, thus causing miseducation of the host immune system. Due to the notable similarities we found between human and bacterial GAD, these deputized immune cells may then target human beta cells leading to the development of T1D.
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Affiliation(s)
- Suhana Bedi
- Department of Natural Sciences and Mathematics, The University of Texas at Dallas, Richardson, TX, United States of America
| | - Tiffany M. Richardson
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, United States of America
| | - Baofeng Jia
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, CA, United States of America
| | - Hadeel Saab
- Intern, The(sugar)science, Los Angeles, CA, United States of America
| | - Fiona S. L. Brinkman
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, CA, United States of America
| | - Monica Westley
- Founder, The(sugar)science, Los Angeles, CA, United States of America
- * E-mail:
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14
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Huang D, Wang Y, Thompson JW, Yin T, Alexander PB, Qin D, Mudgal P, Wu H, Liang Y, Tan L, Pan C, Yuan L, Wan Y, Li QJ, Wang XF. Cancer-cell-derived GABA promotes β-catenin-mediated tumour growth and immunosuppression. Nat Cell Biol 2022; 24:230-241. [PMID: 35145222 PMCID: PMC8852304 DOI: 10.1038/s41556-021-00820-9] [Citation(s) in RCA: 77] [Impact Index Per Article: 38.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 11/23/2021] [Indexed: 12/18/2022]
Abstract
Many cancers have an unusual dependence on glutamine. However, most previous studies have focused on the contribution of glutamine to metabolic building blocks and the energy supply. Here, we report that cancer cells with aberrant expression of glutamate decarboxylase 1 (GAD1) rewire glutamine metabolism for the synthesis of γ-aminobutyric acid (GABA)-a prominent neurotransmitter-in non-nervous tissues. An analysis of clinical samples reveals that increased GABA levels predict poor prognosis. Mechanistically, we identify a cancer-intrinsic pathway through which GABA activates the GABAB receptor to inhibit GSK-3β activity, leading to enhanced β-catenin signalling. This GABA-mediated β-catenin activation both stimulates tumour cell proliferation and suppresses CD8+ T cell intratumoural infiltration, such that targeting GAD1 or GABABR in mouse models overcomes resistance to anti-PD-1 immune checkpoint blockade therapy. Our findings uncover a signalling role for tumour-derived GABA beyond its classic function as a neurotransmitter that can be targeted pharmacologically to reverse immunosuppression.
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Affiliation(s)
- De Huang
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA
| | - Yan Wang
- Institute of Pathology and Southwest Cancer Center, Chongqing, China
- Southwest Hospital, Chongqing, China
| | - J Will Thompson
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA
- Proteomics and Metabolomics Shared Resource, Center for Genomic and Computational Biology, Duke University, Durham, NC, USA
| | - Tao Yin
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA
| | - Peter B Alexander
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA
| | - Diyuan Qin
- Department of Immunology, Duke University Medical Center, Durham, NC, USA
| | | | | | - Yaosi Liang
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA
| | - Lianmei Tan
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA
| | - Christopher Pan
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA
| | - Lifeng Yuan
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA
| | - Ying Wan
- Southwest Hospital, Chongqing, China
| | - Qi-Jing Li
- Department of Immunology, Duke University Medical Center, Durham, NC, USA.
| | - Xiao-Fan Wang
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA.
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15
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S RM, Bedair MF, Li H, Duff SMG. Phenotypic effects from the expression of a deregulated AtGAD1 transgene and GABA pathway suppression mutants in maize. PLoS One 2021; 16:e0259365. [PMID: 34871322 PMCID: PMC8648116 DOI: 10.1371/journal.pone.0259365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 10/18/2021] [Indexed: 11/18/2022] Open
Abstract
Glutamate decarboxylase (GAD; EC 4.1.1.15) catalyzes the irreversible decarboxylation of glutamate to produce γ-aminobutyric acid (GABA); a ubiquitous non-protein amino acid involved in the regulation of several aspects of plant metabolism and physiology. To study the function of GAD and GABA in maize, we have; 1) introduced native and deregulated forms of AtGAD1 into maize with the intent of increasing the synthesis of GABA and 2) introduced constructs into maize designed to suppress the activity of several GABA shunt, GABA transport and GABA pathway genes. Maize plants expressing the deregulated AtGAD1 exhibit a severe chlorosis and retarded growth phenotype and have high levels of GABA, and Ca++/CaM-independent GAD activity. Plants expressing the suppression constructs for GABA biosynthetic and transport pathway genes had no observable phenotype whereas a knockout of GABA catabolic pathway genes led to growth and developmental defects under standard growth conditions. The implications of this study to our understanding of the action and function of GABA and GAD in crops are discussed.
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Affiliation(s)
- Rajani M. S
- Bayer US, Chesterfield, MO, United States of America
| | | | - Hong Li
- Bayer US, Chesterfield, MO, United States of America
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16
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Alballa T, Boone EL, Ma L, Snyder A, Moeller FG. Exploring the relationship between white matter integrity, cocaine use and GAD polymorphisms using Bayesian Model Averaging. PLoS One 2021; 16:e0254776. [PMID: 34310624 PMCID: PMC8312937 DOI: 10.1371/journal.pone.0254776] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 07/02/2021] [Indexed: 11/30/2022] Open
Abstract
Past investigations utilizing diffusion tensor imaging (DTI) have demonstrated that cocaine use disorder (CUD) yields white matter changes, primarily in the corpus callosum. By applying Bayesian model averaging using multiple linear regression in DTI, we demonstrate there may exist relationships between the impaired white matter and glutamic acid decarboxylase (GAD) polymorphisms. This work explored the two-way and three-way interactions between GAD1a (SNP: rs1978340) and GAD1b (SNP: rs769390) polymorphisms and years of cocaine use (YCU). GAD1a was associated with more frontal white matter changes on its own but GAD1b was associated with more midbrain and cerebellar changes as well as a greater increase in white matter changes in the context of chronic cocaine use. The three-way interaction GAD1a|GAD1b|YCU appeared to be roughly an average of the polymorphism two-way interactions GAD1a|YCU and GAD1b|YCU. The three-way interaction demonstrated multiple regions including corpus callosum which featured fewer significant voxel changes, perhaps suggesting a small protective effect of having both polymorphisms on corpus callosum and cerebellar peduncle.
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Affiliation(s)
- Tmader Alballa
- Department of Statistical Sciences and Operations Research, Virginia Commonwealth University, Richmond, Virginia, United States of America
- Mathematical Sciences Department, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Edward L. Boone
- Department of Statistical Sciences and Operations Research, Virginia Commonwealth University, Richmond, Virginia, United States of America
- Institute of Drug and Alcohol Studies, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Liangsuo Ma
- Department of Psychiatry, Virginia Commonwealth University, Richmond, Virginia, United States of America
- Institute of Drug and Alcohol Studies, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - Andrew Snyder
- C. Kenneth and Dianne Wright, Center for Clinical Translational Research, Virginia Commonwealth University, Richmond, Virginia, United States of America
| | - F. Gerard Moeller
- Institute of Drug and Alcohol Studies, Virginia Commonwealth University, Richmond, Virginia, United States of America
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, Virginia, United States of America
- Department of Neurology, Virginia Commonwealth University, Richmond, Virginia, United States of America
- C. Kenneth and Dianne Wright, Center for Clinical Translational Research, Virginia Commonwealth University, Richmond, Virginia, United States of America
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17
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Pöstyéni E, Kovács-Valasek A, Urbán P, Czuni L, Sétáló G, Fekete C, Gabriel R. Profile of miR-23 Expression and Possible Role in Regulation of Glutamic Acid Decarboxylase during Postnatal Retinal Development. Int J Mol Sci 2021; 22:ijms22137078. [PMID: 34209226 PMCID: PMC8268301 DOI: 10.3390/ijms22137078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/14/2021] [Accepted: 06/28/2021] [Indexed: 11/28/2022] Open
Abstract
As neurotransmitter, GABA is fundamental for physiological processes in the developing retina. Its synthesis enzymes are present during retinal development, although the molecular regulatory mechanisms behind the changes in expression are not entirely understood. In this study, we revealed the expression patterns of glutamic acid decarboxylase 67(GAD67) and its coding gene (GAD1) and its potential miRNA-dependent regulation during the first three postnatal weeks in rat retina. To gain insight into the molecular mechanisms, miRNA-sequencing supported by RT-qPCR and in situ hybridization were carried out. GAD1 expression shows an increasing tendency, peaking at P15. From the in silico-predicted GAD1 targeting miRNAs, only miR-23 showed similar expression patterns, which is a known regulator of GAD1 expression. For further investigation, we made an in situ hybridization investigation where both GAD67 and miR-23 also showed lower expression before P7, with the intensity of expression gradually increasing until P21. Horizontal cells at P7, amacrine cells at P15 and P21, and some cells in the ganglion cell layer at several time points were double labelled with miR-23 and GAD67. Our results highlight the complexity of these regulatory networks and the possible role of miR-23 in the regulation of GABA synthesizing enzyme expression during postnatal retina development.
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Affiliation(s)
- Etelka Pöstyéni
- Department of Experimental Zoology and Neurobiology, University of Pécs, 7624 Pécs, Hungary;
| | - Andrea Kovács-Valasek
- Department of Experimental Zoology and Neurobiology, University of Pécs, 7624 Pécs, Hungary;
- Correspondence: (A.K.-V.); (R.G.)
| | - Péter Urbán
- János Szentágothai Research Centre, 7624 Pécs, Hungary; (P.U.); (L.C.); (C.F.)
| | - Lilla Czuni
- János Szentágothai Research Centre, 7624 Pécs, Hungary; (P.U.); (L.C.); (C.F.)
| | - György Sétáló
- Department of Medical Biology, Medical School, University of Pécs, 7624 Pécs, Hungary;
| | - Csaba Fekete
- János Szentágothai Research Centre, 7624 Pécs, Hungary; (P.U.); (L.C.); (C.F.)
| | - Robert Gabriel
- Department of Experimental Zoology and Neurobiology, University of Pécs, 7624 Pécs, Hungary;
- Correspondence: (A.K.-V.); (R.G.)
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18
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Kogure M, Kanahara N, Miyazawa A, Oishi K, Nakata Y, Oda Y, Iyo M. Interacting Roles of COMT and GAD1 Genes in Patients with Treatment-Resistant Schizophrenia: a Genetic Association Study of Schizophrenia Patients and Healthy Controls. J Mol Neurosci 2021; 71:2575-2582. [PMID: 34125398 DOI: 10.1007/s12031-021-01866-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 06/03/2021] [Indexed: 12/21/2022]
Abstract
The projection from dopaminergic neurons to gamma-aminobutyric acid (GABA) interneurons in the prefrontal cortex is involved in the etiology of schizophrenia. The impact of interacting effects between dopamine signals and the expression of GABA on the clinical phenotypes of schizophrenia has not been studied. Since these interactions could be closely involved in prefrontal cortex functions, patients with specific alleles of these relevant molecules (which lead to lower or vulnerable genetic functions) may develop treatment-refractory symptoms. We conducted a genetic association study focusing on COMT and GAD1 genes for a treatment-resistant schizophrenia (TRS) group (n=171), a non-TRS group (n=592), and healthy controls (HC: n=447), and we examined allelic combinations specific to TRS. The results revealed that the percentage of subjects with Met allele of rs4680 on the COMT gene and C/C homozygote of rs3470934 on the GAD1 gene was significantly higher in the TRS group than the other two groups. There was no significant difference between the non-TRS group and HC groups. Considering the direction of functions of these single-nucleotide polymorphisms revealed by previous studies, we speculate that subjects with the Met/CC allelic combination could have a higher dopamine level and a lower expression of GABA in the prefrontal cortex. Our results suggest that an interaction between the dopaminergic signal and GABA signal intensities could differ between TRS patients and patients with other types of schizophrenia and healthy subjects.
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Affiliation(s)
- Masanobu Kogure
- Department of Psychiatry, Chiba University Graduate School of Medicine, Chiba, Japan
| | - Nobuhisa Kanahara
- Department of Psychiatry, Chiba University Graduate School of Medicine, Chiba, Japan.
- Division of Medical Treatment and Rehabilitation, Center for Forensic Mental Health, Chiba University, Chiba, Japan.
| | - Atsuhiro Miyazawa
- Department of Psychiatry, Chiba University Graduate School of Medicine, Chiba, Japan
- Doujin-kai Kisarazu Hospital, Chiba, Japan
| | - Kengo Oishi
- Department of Psychiatry, Chiba University Graduate School of Medicine, Chiba, Japan
- Department of Cyclic Innovation, Japan Agency for Medical Research Development, Tokyo, Japan
| | - Yusuke Nakata
- Department of Psychiatry, Chiba University Graduate School of Medicine, Chiba, Japan
| | - Yasunori Oda
- Department of Psychiatry, Chiba University Graduate School of Medicine, Chiba, Japan
| | - Masaomi Iyo
- Department of Psychiatry, Chiba University Graduate School of Medicine, Chiba, Japan
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19
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Xu B, Long Y, Feng X, Zhu X, Sai N, Chirkova L, Betts A, Herrmann J, Edwards EJ, Okamoto M, Hedrich R, Gilliham M. GABA signalling modulates stomatal opening to enhance plant water use efficiency and drought resilience. Nat Commun 2021; 12:1952. [PMID: 33782393 PMCID: PMC8007581 DOI: 10.1038/s41467-021-21694-3] [Citation(s) in RCA: 63] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 02/04/2021] [Indexed: 01/26/2023] Open
Abstract
The non-protein amino acid γ-aminobutyric acid (GABA) has been proposed to be an ancient messenger for cellular communication conserved across biological kingdoms. GABA has well-defined signalling roles in animals; however, whilst GABA accumulates in plants under stress it has not been determined if, how, where and when GABA acts as an endogenous plant signalling molecule. Here, we establish endogenous GABA as a bona fide plant signal, acting via a mechanism not found in animals. Using Arabidopsis thaliana, we show guard cell GABA production is necessary and sufficient to reduce stomatal opening and transpirational water loss, which improves water use efficiency and drought tolerance, via negative regulation of a stomatal guard cell tonoplast-localised anion transporter. We find GABA modulation of stomata occurs in multiple plants, including dicot and monocot crops. This study highlights a role for GABA metabolism in fine tuning physiology and opens alternative avenues for improving plant stress resilience.
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Affiliation(s)
- Bo Xu
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, Waite Research Institute, Glen Osmond, SA, Australia
- School of Agriculture, Food and Wine, Waite Research Precinct, University of Adelaide, Glen Osmond, SA, Australia
| | - Yu Long
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, Waite Research Institute, Glen Osmond, SA, Australia
- School of Agriculture, Food and Wine, Waite Research Precinct, University of Adelaide, Glen Osmond, SA, Australia
| | - Xueying Feng
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, Waite Research Institute, Glen Osmond, SA, Australia
- School of Agriculture, Food and Wine, Waite Research Precinct, University of Adelaide, Glen Osmond, SA, Australia
| | - Xujun Zhu
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, Waite Research Institute, Glen Osmond, SA, Australia
- College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Na Sai
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, Waite Research Institute, Glen Osmond, SA, Australia
- School of Agriculture, Food and Wine, Waite Research Precinct, University of Adelaide, Glen Osmond, SA, Australia
| | - Larissa Chirkova
- School of Agriculture, Food and Wine, Waite Research Precinct, University of Adelaide, Glen Osmond, SA, Australia
- ARC Industrial Transformation Research Hub for Wheat in a Hot and Dry Climate, Waite Research Institute, University of Adelaide, Glen Osmond, SA, Australia
| | - Annette Betts
- CSIRO Agriculture & Food, Glen Osmond, SA, Australia
| | - Johannes Herrmann
- Institute for Molecular Plant Physiology and Biophysics, University of Würzburg, Würzburg, Germany
| | | | - Mamoru Okamoto
- School of Agriculture, Food and Wine, Waite Research Precinct, University of Adelaide, Glen Osmond, SA, Australia
- ARC Industrial Transformation Research Hub for Wheat in a Hot and Dry Climate, Waite Research Institute, University of Adelaide, Glen Osmond, SA, Australia
| | - Rainer Hedrich
- Institute for Molecular Plant Physiology and Biophysics, University of Würzburg, Würzburg, Germany
| | - Matthew Gilliham
- Plant Transport and Signalling Lab, ARC Centre of Excellence in Plant Energy Biology, Waite Research Institute, Glen Osmond, SA, Australia.
- School of Agriculture, Food and Wine, Waite Research Precinct, University of Adelaide, Glen Osmond, SA, Australia.
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Jang M, Jeong DW, Heo G, Kong H, Kim CT, Lee JH. Genetic Background Behind the Amino Acid Profiles of Fermented Soybeans Produced by Four Bacillus spp. J Microbiol Biotechnol 2021; 31:447-455. [PMID: 33526757 PMCID: PMC9705888 DOI: 10.4014/jmb.2012.12051] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/21/2021] [Accepted: 01/21/2021] [Indexed: 12/15/2022]
Abstract
Strains of four Bacillus spp. were respectively inoculated into sterilized soybeans and the free amino acid profiles of the resulting cultures were analyzed to discern their metabolic traits. After 30 days of culture, B. licheniformis showed the highest production of serine, threonine, and glutamic acid; B. subtilis exhibited the highest production of alanine, asparagine, glycine, leucine, proline, tryptophan, and lysine. B. velezensis increased the γ-aminobutyric acid (GABA) concentration to >200% of that in the control samples. B. sonorensis produced a somewhat similar amino acid profile with B. licheniformis. Comparative genomic analysis of the four Bacillus strains and the genetic profiles of the produced free amino acids revealed that genes involved in glutamate and arginine metabolism were not common to the four strains. The genes gadA/B (encoding a glutamate decarboxylase), rocE (amino acid permease), and puuD (γ-glutamyl-γ-aminobutyrate hydrolase) determined GABA production, and their presence was species-specific. Taken together, B. licheniformis and B. velezensis were respectively shown to have high potential to increase concentrations of glutamic acid and GABA, while B. subtilis has the ability to increase essential amino acid concentrations in fermented soybean foods.
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Affiliation(s)
- Mihyun Jang
- Department of Food Science and Biotechnology, Kyonggi University, Suwon 16227, Republic of Korea
| | - Do-Won Jeong
- Department of Food and Nutrition, Dongduk Women’s University, Seoul 02748, Republic of Korea
| | - Ganghun Heo
- Department of Food Science and Biotechnology, Kyonggi University, Suwon 16227, Republic of Korea
| | - Haram Kong
- Department of Food Science and Biotechnology, Kyonggi University, Suwon 16227, Republic of Korea
| | | | - Jong-Hoon Lee
- Department of Food Science and Biotechnology, Kyonggi University, Suwon 16227, Republic of Korea
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Chuzho N, Kumar N, Mishra N, Tandon N, Kanga U, Kaur G, Singh P, Mishra G, Sharma S, Mehra NK. Differential HLA Association of GAD65 and IA2 Autoantibodies in North Indian Type 1 Diabetes Patients. J Diabetes Res 2021; 2021:4012893. [PMID: 34988229 PMCID: PMC8723877 DOI: 10.1155/2021/4012893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Revised: 11/23/2021] [Accepted: 12/02/2021] [Indexed: 11/17/2022] Open
Abstract
The human leucocyte antigen (HLA) association with type 1 diabetes (T1D) is well known but there are limited studies investigating the association between β-cell autoantibodies and HLA genes. We evaluated the prevalence of GAD65 and IA-2 autoantibodies (GADA and IA2A) in 252 T1D patients from North India and investigated the genetic association of GADA and IA2A with HLA class I and class II genes/haplotypes. GADA and IA2A were detected in 50.79% and 15.87% of T1D patients, respectively, while only 8.73% had both GADA and IA2A. HLA-DRB1∗03 was observed to be significantly higher in GADA+ T1D patients as compared to GADA- (91.41% vs. 66.13%, Bonferroni-corrected P (P c) = 1.11 × 10-5; OR = 5.45; 95% CI: 2.67-11.08). Similarly, HLA-DQB1∗02 was found to be significantly increased in GADA+ patients (94.53%, P c = 2.19 × 10-5; OR = 6.27; 95% CI: 2.7-14.49) as compared to GADA- (73.39%). The frequencies of HLA-DRB1∗04 and DQB1∗03 were increased in IA2A+ patients (45.0% and 52.5%, respectively) as compared to that in IA2A- (25.94% and 33.96%, respectively). Further, the frequency of DRB1∗03-DQB1∗02 haplotype was found to be significantly increased in GADA+ T1D patients as compared to GADA- (60.55% vs. 41.94%, P = 3.94 × 10-5; OR = 2.13; 95%CI = 1.49-3.03). Similarly, HLA-DRB1∗04-DQB1∗03 haplotype was found to be significantly increased in IA2A+ T1D patients compared to IA2A- patients (22.5% vs. 12.97%; P = 0.041; OR = 1.95; 95%CI = 1.08-3.52). None of the HLA class I genes (HLA-A, B, and Cw) was found to be associated with GADA or IA2A in people with T1D. Our findings suggest that HLA-DRB1∗03/DQB1∗02 and HLA-DRB1∗04/DQB1∗03 might play an important role in the development of GADA and IA2A, respectively.
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Affiliation(s)
- Neihenuo Chuzho
- Indian Council of Medical Research (ICMR)-National Institute of Pathology, Safdarjung Hospital Campus, New Delhi, India
- Symbiosis School of Biological Sciences, Symbiosis International (Deemed University), Pune, India
| | - Neeraj Kumar
- Indian Council of Medical Research (ICMR)-National Institute of Pathology, Safdarjung Hospital Campus, New Delhi, India
| | - Neetu Mishra
- Symbiosis School of Biological Sciences, Symbiosis International (Deemed University), Pune, India
| | - Nikhil Tandon
- Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, New Delhi, India
| | - Uma Kanga
- Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India
| | - Gurvinder Kaur
- Laboratory Oncology Unit, Dr BR Ambedkar Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
| | - Paras Singh
- Department of Molecular Medicine, National Institute of Tuberculosis and Respiratory Diseases, Sri Aurobindo Marg, New Delhi, India
| | - Gunja Mishra
- Indian Council of Medical Research (ICMR)-National Institute of Pathology, Safdarjung Hospital Campus, New Delhi, India
| | - Shreya Sharma
- Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, New Delhi, India
| | - Narinder K. Mehra
- Emeritus Scientist (ICMR), and Former Dean (Research), All India Institute of Medical Sciences, New Delhi, India
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Affiliation(s)
- Jing Fan
- Morgridge Institute for Research, Madison, WI, USA.
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI, USA.
| | - Edward A Phelps
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA.
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Seo S, Song Y, Gu SM, Min HK, Hong JT, Cha HJ, Yun J. D-limonene Inhibits Pentylenetetrazole-Induced Seizure via Adenosine A2A Receptor Modulation on GABAergic Neuronal Activity. Int J Mol Sci 2020; 21:ijms21239277. [PMID: 33291789 PMCID: PMC7730947 DOI: 10.3390/ijms21239277] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 12/02/2020] [Accepted: 12/02/2020] [Indexed: 12/12/2022] Open
Abstract
Background: Epilepsy is a chronic neurological disorder characterized by the recurrence of seizures. One-third of patients with epilepsy may not respond to antiseizure drugs. Purpose: We aimed to examine whether D-limonene, a cyclic monoterpene, exhibited any antiseizure activity in the pentylenetetrazole (PTZ)-induced kindling mouse model and in vitro. Methods: PTZ kindling mouse model was established by administering PTZ (30 mg/kg) intraperitoneally to mice once every 48 h. We performed immunoblot blots, immunohistochemistry (IHC), and high-performance liquid chromatography (HPLC) analysis after the behavioral study. Results: An acute injection of PTZ (60 mg/kg) induced seizure in mice, while pretreatment with D-limonene inhibited PTZ-induced seizure. Repeated administration of PTZ (30 mg/kg) increased the seizure score gradually in mice, which was reduced in D-limonene (10 mg/kg)-pretreated group. In addition, D-limonene treatment increased glutamate decarboxylase-67 (GAD-67) expression in the hippocampus. Axonal sprouting of hippocampal neurons after kindling was inhibited by D-limonene pretreatment. Moreover, D-limonene reduced the expression levels of Neuronal PAS Domain Protein 4 (Npas4)-induced by PTZ. Furthermore, the adenosine A2A antagonist SCH58261 and ZM241385 inhibited anticonvulsant activity and gamma-aminobutyric acid (GABA)ergic neurotransmission-induced by D-limonene. Conclusion: These results suggest that D-limonene exhibits anticonvulsant activity through modulation of adenosine A2A receptors on GABAergic neuronal function.
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Affiliation(s)
- Sowoon Seo
- College of Pharmacy and Medical Research Center, Chungbuk National University, Osongsaengmyeong 1-ro 194-31, Osong-eup, Heungduk-gu, Cheongju, Chungbuk 28160, Korea; (S.S.); (Y.S.); (S.M.G.); (H.K.M.); (J.T.H.)
| | - Yunjeong Song
- College of Pharmacy and Medical Research Center, Chungbuk National University, Osongsaengmyeong 1-ro 194-31, Osong-eup, Heungduk-gu, Cheongju, Chungbuk 28160, Korea; (S.S.); (Y.S.); (S.M.G.); (H.K.M.); (J.T.H.)
| | - Sun Mi Gu
- College of Pharmacy and Medical Research Center, Chungbuk National University, Osongsaengmyeong 1-ro 194-31, Osong-eup, Heungduk-gu, Cheongju, Chungbuk 28160, Korea; (S.S.); (Y.S.); (S.M.G.); (H.K.M.); (J.T.H.)
| | - Hyun Kyu Min
- College of Pharmacy and Medical Research Center, Chungbuk National University, Osongsaengmyeong 1-ro 194-31, Osong-eup, Heungduk-gu, Cheongju, Chungbuk 28160, Korea; (S.S.); (Y.S.); (S.M.G.); (H.K.M.); (J.T.H.)
| | - Jin Tae Hong
- College of Pharmacy and Medical Research Center, Chungbuk National University, Osongsaengmyeong 1-ro 194-31, Osong-eup, Heungduk-gu, Cheongju, Chungbuk 28160, Korea; (S.S.); (Y.S.); (S.M.G.); (H.K.M.); (J.T.H.)
| | - Hye Jin Cha
- Narcotics Policy Division, Ministry of Food and Drug Safety, Osong-eup, Heungduk-gu, Cheongju, Chungbuk 28160, Korea
- Correspondence: (H.J.C.); (J.Y.); Tel.: +82-43-719-5204 (H.J.C.); +82-43-261-2827 (J.Y.)
| | - Jaesuk Yun
- College of Pharmacy and Medical Research Center, Chungbuk National University, Osongsaengmyeong 1-ro 194-31, Osong-eup, Heungduk-gu, Cheongju, Chungbuk 28160, Korea; (S.S.); (Y.S.); (S.M.G.); (H.K.M.); (J.T.H.)
- Correspondence: (H.J.C.); (J.Y.); Tel.: +82-43-719-5204 (H.J.C.); +82-43-261-2827 (J.Y.)
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Zhang F, Hu K, Huang J, Tan Z, Ruan J. Effects of two kinds of fishery drugs on the expressions of GAD and GABA-T mRNA in crucian carp (Carassius auratus gibelio). Fish Physiol Biochem 2020; 46:1965-1973. [PMID: 32671610 PMCID: PMC7584538 DOI: 10.1007/s10695-020-00847-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 07/07/2020] [Indexed: 06/11/2023]
Abstract
The objective of this study was to investigate the effects of difloxacin (DIF) and avermectin (AVM) on glutamate decarboxylase (GAD) and GABA-transaminase (GABA-T) in different tissues of crucian carp (Carassius auratus gibelio). After the treatments of DIF and AVM, the mRNA expressions of GAD and GABA-T in different tissues were detected by quantitative real-time PCR (qPCR). The results showed that the mRNA expressions of GAD65, GAD67, and GABA-T in the telencephalon (Tel), mesencephalon (Mes), cerebella (Cer), and medulla oblongata (Med) were downregulated significantly with the safe dose (SD, 20 mg/kg) of DIF (P < 0.05 or P < 0.01). While the expressions of GAD65 and GAD67 in the kidney at 12 h had strikingly upregulated to 13.81 ± 1.06** and 150.67 ± 12.85** times. Treated with the lethal dose of 50% (LD50, 2840 mg/kg b. W.) of DIF, the mRNA expressions of GAD65, GAD67, and GABA-T in all tissues were increased significantly (P < 0.01). The results of AVM group showed that the mRNA expressions of GAD65, GAD67, and GABA-T both in the central and peripheral tissues were all remarkably downregulated at the safe concentration (SC, 0.0039 mg/L) and the lethal concentration of 50% (LC50, 0.039 mg/L), except for the mRNA inhibitions of GAD65, GAD67, and GABA-T in the muscle at 2 h which sharply downregulated to 0.20 ± 0.02ΔΔ × 10-2, 0.57 ± 0.06ΔΔ × 10-1 and 0.44 ± 0.02ΔΔ × 10-1, respectively (P < 0.01).
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Affiliation(s)
- Fan Zhang
- Department of Aquaculture, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Kun Hu
- National Center for Aquatic Pathogen Collection, College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, 201306, China
| | - Jianzhen Huang
- Department of Aquaculture, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Zhi Tan
- Department of Aquaculture, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Jiming Ruan
- Department of Aquaculture, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, 330045, China.
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Bizzozzero-Hiriart M, Di Giorgio NP, Libertun C, Lux-Lantos V. GABAergic input through GABA B receptors is necessary during a perinatal window to shape gene expression of factors critical to reproduction such as Kiss1. Am J Physiol Endocrinol Metab 2020; 318:E901-E919. [PMID: 32286880 DOI: 10.1152/ajpendo.00547.2019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Lack of GABAB receptors in GABAB1 knockout mice decreases neonatal ARC kisspeptin 1 (Kiss1) expression in the arcuate nucleus of the hypothalamus (ARC) in females, which show impaired reproduction as adults. Our aim was to selectively impair GABAB signaling during a short postnatal period to evaluate its impact on the reproductive system. Neonatal male and female mice were injected with the GABAB antagonist CGP 55845 (CGP, 1 mg/kg body wt sc) or saline from postnatal day 2 (PND2) to PND6, three times per day (8 AM, 1 PM, and 6 PM). One group was killed on PND6 for collection of blood samples (hormones by radioimmunoassay), brains for gene expression in the anteroventral periventricular nucleus-periventricular nucleus continuum (AVPV/PeN), and ARC micropunches [quantitative PCR (qPCR)] and gonads for qPCR, hormone contents, and histology. A second group of mice was injected with CGP (1 mg/kg body wt sc) or saline from PND2 to PND6, three times per day (8 AM, 1 PM, and 6 PM), and left to grow to adulthood. We measured body weight during development and parameters of sexual differentiation, puberty onset, and estrous cycles. Adult mice were killed, and trunk blood (hormones), brains for qPCR, and gonads for qPCR and hormone contents were obtained. Our most important findings on PND6 include the CGP-induced decrease in ARC Kiss1 and increase in neurokinin B (Tac2) in both sexes; the decrease in AVPV/PeN tyrosine hydroxylase (Th) only in females; the increase in gonad estradiol content in both sexes; and the increase in primordial follicles and decrease in primary and secondary follicles. Neonatally CGP-treated adults showed decreased ARC Kiss1 and ARC gonadotropin-releasing hormone (Gnrh1) and increased ARC glutamic acid decarboxylase 67 (Gad1) only in males; increased ARC GABAB receptor subunit 1 (Gabbr1) in both sexes; and decreased AVPV/PeN Th only in females. We demonstrate that ARC Kiss1 expression is chronically downregulated in males and that the normal sex difference in AVPV/PeN Th expression is abolished. In conclusion, neonatal GABAergic input through GABAB receptors shapes gene expression of factors critical to reproduction.
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MESH Headings
- Animals
- Animals, Newborn
- Arcuate Nucleus of Hypothalamus/drug effects
- Arcuate Nucleus of Hypothalamus/metabolism
- Estradiol/metabolism
- Female
- Follicle Stimulating Hormone/metabolism
- GABA-B Receptor Antagonists/pharmacology
- Gene Expression Regulation, Developmental/drug effects
- Gene Expression Regulation, Developmental/physiology
- Glutamate Decarboxylase/genetics
- Glutamate Decarboxylase/metabolism
- Gonadotropin-Releasing Hormone/genetics
- Gonadotropin-Releasing Hormone/metabolism
- Hypothalamus, Anterior/drug effects
- Hypothalamus, Anterior/metabolism
- Kisspeptins/genetics
- Kisspeptins/metabolism
- Luteinizing Hormone/metabolism
- Male
- Mice
- Ovary/drug effects
- Ovary/metabolism
- Phosphinic Acids/pharmacology
- Propanolamines/pharmacology
- Protein Precursors/genetics
- Protein Precursors/metabolism
- Puberty/drug effects
- Puberty/genetics
- Receptors, Estrogen/genetics
- Receptors, Estrogen/metabolism
- Receptors, GABA-B/genetics
- Receptors, GABA-B/metabolism
- Receptors, Progesterone/genetics
- Receptors, Progesterone/metabolism
- Reproduction/drug effects
- Reproduction/genetics
- Reverse Transcriptase Polymerase Chain Reaction
- Sex Differentiation/drug effects
- Sex Differentiation/genetics
- Tachykinins/genetics
- Tachykinins/metabolism
- Testis/drug effects
- Testis/metabolism
- Testosterone/metabolism
- Tyrosine 3-Monooxygenase/genetics
- Tyrosine 3-Monooxygenase/metabolism
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Affiliation(s)
- Marianne Bizzozzero-Hiriart
- Laboratorio de Neuroendocrinología, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Noelia P Di Giorgio
- Laboratorio de Neuroendocrinología, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Carlos Libertun
- Laboratorio de Neuroendocrinología, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
- Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, Argentina
| | - Victoria Lux-Lantos
- Laboratorio de Neuroendocrinología, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
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Kalish BT, Barkat TR, Diel EE, Zhang EJ, Greenberg ME, Hensch TK. Single-nucleus RNA sequencing of mouse auditory cortex reveals critical period triggers and brakes. Proc Natl Acad Sci U S A 2020; 117:11744-11752. [PMID: 32404418 PMCID: PMC7261058 DOI: 10.1073/pnas.1920433117] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Auditory experience drives neural circuit refinement during windows of heightened brain plasticity, but little is known about the genetic regulation of this developmental process. The primary auditory cortex (A1) of mice exhibits a critical period for thalamocortical connectivity between postnatal days P12 and P15, during which tone exposure alters the tonotopic topography of A1. We hypothesized that a coordinated, multicellular transcriptional program governs this window for patterning of the auditory cortex. To generate a robust multicellular map of gene expression, we performed droplet-based, single-nucleus RNA sequencing (snRNA-seq) of A1 across three developmental time points (P10, P15, and P20) spanning the tonotopic critical period. We also tone-reared mice (7 kHz pips) during the 3-d critical period and collected A1 at P15 and P20. We identified and profiled both neuronal (glutamatergic and GABAergic) and nonneuronal (oligodendrocytes, microglia, astrocytes, and endothelial) cell types. By comparing normal- and tone-reared mice, we found hundreds of genes across cell types showing altered expression as a result of sensory manipulation during the critical period. Functional voltage-sensitive dye imaging confirmed GABA circuit function determines critical period onset, while Nogo receptor signaling is required for its closure. We further uncovered previously unknown effects of developmental tone exposure on trajectories of gene expression in interneurons, as well as candidate genes that might execute tonotopic plasticity. Our single-nucleus transcriptomic resource of developing auditory cortex is thus a powerful discovery platform with which to identify mediators of tonotopic plasticity.
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Affiliation(s)
- Brian T Kalish
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115
- Division of Newborn Medicine, Department of Medicine, Boston Children's Hospital, Boston, MA 02115
| | - Tania R Barkat
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138
- Center for Brain Science, Harvard University, Cambridge, MA 02138
| | - Erin E Diel
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138
- Center for Brain Science, Harvard University, Cambridge, MA 02138
| | | | | | - Takao K Hensch
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138;
- Center for Brain Science, Harvard University, Cambridge, MA 02138
- F. M. Kirby Neurobiology Center, Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115
- Child Brain Development, Canadian Institute for Advanced Research, Toronto, ON M5G 1M1, Canada
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Léger C, Dupré N, Aligny C, Bénard M, Lebon A, Henry V, Hauchecorne M, Galas L, Frebourg T, Leroux P, Vivien D, Lecointre M, Marret S, Gonzalez BJ. Glutamate controls vessel-associated migration of GABA interneurons from the pial migratory route via NMDA receptors and endothelial protease activation. Cell Mol Life Sci 2020; 77:1959-1986. [PMID: 31392351 PMCID: PMC7229000 DOI: 10.1007/s00018-019-03248-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 07/08/2019] [Accepted: 07/23/2019] [Indexed: 12/20/2022]
Abstract
During cortex development, fine interactions between pyramidal cells and migrating GABA neurons are required to orchestrate correct positioning of interneurons, but cellular and molecular mechanisms are not yet clearly understood. Functional and age-specific expression of NMDA receptors by neonate endothelial cells suggests a vascular contribution to the trophic role of glutamate during cortical development. Associating functional and loss-of-function approaches, we found that glutamate stimulates activity of the endothelial proteases MMP-9 and t-PA along the pial migratory route (PMR) and radial cortical microvessels. Activation of MMP-9 was NMDAR-dependent and abrogated in t-PA-/- mice. Time-lapse recordings revealed that glutamate stimulated migration of GABA interneurons along vessels through an NMDAR-dependent mechanism. In Gad67-GFP mice, t-PA invalidation and in vivo administration of an MMP inhibitor impaired positioning of GABA interneurons in superficial cortical layers, whereas Grin1 endothelial invalidation resulted in a strong reduction of the thickness of the pial migratory route, a marked decrease of the glutamate-induced MMP-9-like activity along the PMR and a depopulation of interneurons in superficial cortical layers. This study supports that glutamate controls the vessel-associated migration of GABA interneurons by regulating the activity of endothelial proteases. This effect requires endothelial NMDAR and is t-PA-dependent. These neurodevelopmental data reinforce the debate regarding safety of molecules with NMDA-antagonist properties administered to preterm and term neonates.
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Affiliation(s)
- Cécile Léger
- Normandie University, UNIROUEN, INSERM U1245 and Rouen University Hospital, Department of Neonatal Paediatrics and Intensive Care, F 76000, Normandy Centre for Genomic and Personalized Medicine, Rouen, France
| | - Nicolas Dupré
- Normandie University, UNIROUEN, INSERM U1245 and Rouen University Hospital, Department of Neonatal Paediatrics and Intensive Care, F 76000, Normandy Centre for Genomic and Personalized Medicine, Rouen, France
| | - Caroline Aligny
- Normandie University, UNIROUEN, INSERM U1245 and Rouen University Hospital, Department of Neonatal Paediatrics and Intensive Care, F 76000, Normandy Centre for Genomic and Personalized Medicine, Rouen, France
| | - Magalie Bénard
- Normandie University, UNIROUEN, INSERM, PRIMACEN, Rouen, France
| | - Alexis Lebon
- Normandie University, UNIROUEN, INSERM, PRIMACEN, Rouen, France
| | - Vincent Henry
- Normandie University, UNIROUEN, INSERM U1245 and Rouen University Hospital, Department of Neonatal Paediatrics and Intensive Care, F 76000, Normandy Centre for Genomic and Personalized Medicine, Rouen, France
| | - Michelle Hauchecorne
- Normandie University, UNIROUEN, INSERM U1245 and Rouen University Hospital, Department of Neonatal Paediatrics and Intensive Care, F 76000, Normandy Centre for Genomic and Personalized Medicine, Rouen, France
| | - Ludovic Galas
- Normandie University, UNIROUEN, INSERM, PRIMACEN, Rouen, France
| | - Thierry Frebourg
- Normandie University, UNIROUEN, INSERM U1245 and Rouen University Hospital, Department of Neonatal Paediatrics and Intensive Care, F 76000, Normandy Centre for Genomic and Personalized Medicine, Rouen, France
| | - Philippe Leroux
- Normandie University, UNIROUEN, INSERM U1245 and Rouen University Hospital, Department of Neonatal Paediatrics and Intensive Care, F 76000, Normandy Centre for Genomic and Personalized Medicine, Rouen, France
| | - Denis Vivien
- Inserm, Université Caen-Normandie, Inserm, UMR-S U1237 "Physiopathology and Imaging of Neurological Disorders" (PhIND), GIP Cyceron, Caen, France
- Department of Clinical Research, Caen University Hospital, CHU Caen, Caen, France
| | - Maryline Lecointre
- Normandie University, UNIROUEN, INSERM U1245 and Rouen University Hospital, Department of Neonatal Paediatrics and Intensive Care, F 76000, Normandy Centre for Genomic and Personalized Medicine, Rouen, France
| | - Stéphane Marret
- Normandie University, UNIROUEN, INSERM U1245 and Rouen University Hospital, Department of Neonatal Paediatrics and Intensive Care, F 76000, Normandy Centre for Genomic and Personalized Medicine, Rouen, France
| | - Bruno J Gonzalez
- Normandie University, UNIROUEN, INSERM U1245 and Rouen University Hospital, Department of Neonatal Paediatrics and Intensive Care, F 76000, Normandy Centre for Genomic and Personalized Medicine, Rouen, France.
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Yin M, Xia C, Wu C, Ji Y, Zhou Y. Aberrant expression of Nav1.6 in the cochlear nucleus correlates with salicylate-induced tinnitus in rats. Biochem Biophys Res Commun 2020; 526:786-792. [PMID: 32268959 DOI: 10.1016/j.bbrc.2020.03.123] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 03/21/2020] [Indexed: 12/31/2022]
Abstract
Hyperactivity in cochlear nucleus (CN) is one of the major neural correlates for tinnitus induction, yet the molecular factors that participate in the neuronal hyperexcitability remain unclear. The present study showed that acute and chronic administrations of salicylate were both capable of inducing reversible tinnitus in rats. The number of GAD 65/67-immunoreactive neurons in the AVCN and DCN was decreased, while the number of VGLUT 1/2-immunoreactive neurons in the AVCN and DCN was increased when rats were experiencing tinnitus, providing evidence for excitatory-inhibitory imbalance in CN is correlated with tinnitus. Interestingly, the expression level of Nav1.6, an important subtype of voltage-gated sodium channels was significantly increased in the DCN and AVCN of rats experiencing tinnitus, the up-regulation of Nav1.6 was returned to normal level following the disappearance of tinnitus. Double-labeling experiments revealed that Nav1.6 expression was down-regulated in the GAD 65/67-positive neurons in the DCN and AVCN of rats experiencing tinnitus. Notably, the percentage of co-localization of Nav1.6 and NeuN-labeling fusiform neurons was markedly increased in the DCN during tinnitus. These findings uncover the tinnitus-associated alteration in Nav1.6, a potential key contributor that can lead to hyperexcitability in CN and contribute to salicylate-induced tinnitus.
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Affiliation(s)
- Manli Yin
- Institute of Biomembrane and Biopharmaceutics, Shanghai University, Shanghai, 200444, China
| | - Chenchen Xia
- Institute of Biomembrane and Biopharmaceutics, Shanghai University, Shanghai, 200444, China
| | - Cong Wu
- Department of Otolaryngology-Head and Neck Surgery, Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, 200011, China; Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, 200125, China; Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, 200125, China
| | - Yonghua Ji
- Institute of Biomembrane and Biopharmaceutics, Shanghai University, Shanghai, 200444, China; Translational Institute for Cancer Pain, Xinhua Hospital Chongming Branch, Shanghai, 202150, China.
| | - You Zhou
- Department of Otolaryngology-Head and Neck Surgery, Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, 200011, China; Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai, 200125, China; Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, 200125, China.
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Urrutia A, García-Angulo VA, Fuentes A, Caneo M, Legüe M, Urquiza S, Delgado SE, Ugalde J, Burdisso P, Calixto A. Bacterially produced metabolites protect C. elegans neurons from degeneration. PLoS Biol 2020; 18:e3000638. [PMID: 32208418 PMCID: PMC7092960 DOI: 10.1371/journal.pbio.3000638] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Accepted: 02/18/2020] [Indexed: 12/20/2022] Open
Abstract
Caenorhabditis elegans and its cognate bacterial diet comprise a reliable, widespread model to study diet and microbiota effects on host physiology. Nonetheless, how diet influences the rate at which neurons die remains largely unknown. A number of models have been used in C. elegans as surrogates for neurodegeneration. One of these is a C. elegans strain expressing a neurotoxic allele of the mechanosensory abnormality protein 4 (MEC-4d) degenerin/epithelial Na+ (DEG/ENaC) channel, which causes the progressive degeneration of the touch receptor neurons (TRNs). Using this model, our study evaluated the effect of various dietary bacteria on neurodegeneration dynamics. Although degeneration of TRNs was steady and completed at adulthood in the strain routinely used for C. elegans maintenance (Escherichia coli OP50), it was significantly reduced in environmental and other laboratory bacterial strains. Strikingly, neuroprotection reached more than 40% in the E. coli HT115 strain. HT115 protection was long lasting well into old age of animals and was not restricted to the TRNs. Small amounts of HT115 on OP50 bacteria as well as UV-killed HT115 were still sufficient to produce neuroprotection. Early growth of worms in HT115 protected neurons from degeneration during later growth in OP50. HT115 diet promoted the nuclear translocation of DAF-16 (ortholog of the FOXO family of transcription factors), a phenomenon previously reported to underlie neuroprotection caused by down-regulation of the insulin receptor in this system. Moreover, a daf-16 loss-of-function mutation abolishes HT115-driven neuroprotection. Comparative genomics, transcriptomics, and metabolomics approaches pinpointed the neurotransmitter γ-aminobutyric acid (GABA) and lactate as metabolites differentially produced between E. coli HT115 and OP50. HT115 mutant lacking glutamate decarboxylase enzyme genes (gad), which catalyze the conversion of GABA from glutamate, lost the ability to produce GABA and also to stop neurodegeneration. Moreover, in situ GABA supplementation or heterologous expression of glutamate decarboxylase in E. coli OP50 conferred neuroprotective activity to this strain. Specific C. elegans GABA transporters and receptors were required for full HT115-mediated neuroprotection. Additionally, lactate supplementation also increased anterior ventral microtubule (AVM) neuron survival in OP50. Together, these results demonstrate that bacterially produced GABA and other metabolites exert an effect of neuroprotection in the host, highlighting the role of neuroactive compounds of the diet in nervous system homeostasis.
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Affiliation(s)
- Arles Urrutia
- Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago de Chile, Chile
| | - Víctor A. García-Angulo
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago de Chile, Chile
- Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago de Chile, Chile
| | - Andrés Fuentes
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago de Chile, Chile
| | - Mauricio Caneo
- Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago de Chile, Chile
| | - Marcela Legüe
- Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago de Chile, Chile
| | - Sebastián Urquiza
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago de Chile, Chile
| | - Scarlett E. Delgado
- Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago de Chile, Chile
| | - Juan Ugalde
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago de Chile, Chile
| | - Paula Burdisso
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario and Plataforma Argentina de Biología Estructural y Metabolómica (PLABEM), Rosario, Santa Fe, Argentina
| | - Andrea Calixto
- Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor, Santiago de Chile, Chile
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Zhang QF, Hu S, Zhao WR, Huang J, Mei JQ, Mei LH. Parallel Strategy Increases the Thermostability and Activity of Glutamate Decarboxylase. Molecules 2020; 25:molecules25030690. [PMID: 32041144 PMCID: PMC7037157 DOI: 10.3390/molecules25030690] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 01/25/2020] [Accepted: 01/29/2020] [Indexed: 11/29/2022] Open
Abstract
Glutamate decarboxylase (GAD; EC 4.1.1.15) is a unique pyridoxal 5-phosphate (PLP)-dependent enzyme that specifically catalyzes the decarboxylation of L-glutamic acid to produce γ-aminobutyric acid (GABA), which exhibits several well-known physiological functions. However, glutamate decarboxylase from different sources has the common problem of poor thermostability that affects its application in industry. In this study, a parallel strategy comprising sequential analysis and free energy calculation was applied to identify critical amino acid sites affecting thermostability of GAD and select proper mutation contributing to improve structure rigidity of the enzyme. Two mutant enzymes, D203E and S325A, with higher thermostability were obtained, and their semi-inactivation temperature (T5015) values were 2.3 °C and 1.4 °C higher than the corresponding value of the wild-type enzyme (WT), respectively. Moreover, the mutant, S325A, exhibited enhanced activity compared to the wild type, with a 1.67-fold increase. The parallel strategy presented in this work proved to be an efficient tool for the reinforcement of protein thermostability.
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Affiliation(s)
- Qing-Fei Zhang
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, China;
| | - Sheng Hu
- Department of Biological and Pharmaceutical Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China; (S.H.); (W.-R.Z.)
| | - Wei-Rui Zhao
- Department of Biological and Pharmaceutical Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China; (S.H.); (W.-R.Z.)
| | - Jun Huang
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China;
| | - Jia-Qi Mei
- Hangzhou Zhongmei Huadong Pharmaceutical Co. Ltd., Hangzhou 31011, China;
| | - Le-He Mei
- Department of Biological and Pharmaceutical Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China; (S.H.); (W.-R.Z.)
- Correspondence: ; Tel.: +86-571-879-531-61
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Briski KP, Mandal SK. Hindbrain metabolic deficiency regulates ventromedial hypothalamic nucleus glycogen metabolism and glucose‑regulatory signaling. Acta Neurobiol Exp (Wars) 2020; 80:57-65. [PMID: 32214275 PMCID: PMC7325596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The catecholamine norepinephrine (NE) links hindbrain metabolic‑sensory neurons with downstream gluco‑regulatory loci, including the ventromedial hypothalamic nucleus (VMN). Exogenous NE up‑regulates VMN expression of glutamate decarboxylase (GAD), biomarker for the gluco‑inhibitory transmitter γ‑aminobutryic acid (GABA). Brain glycogen phosphorylase (GP)‑muscle (GPmm) and ‑brain (GPbb) variants are stimulated in vitro by NE or energy deficiency, respectively. Current research investigated whether lactoprivic‑driven VMN NE signaling regulates GABA and if VMN GPmm and GPbb profiles react differently to that deficit cue. Male rats were pretreated by caudal fourth ventricle delivery of the selective catecholamine neurotoxin 6‑hydroxydopamine (6OHDA) ahead of the monocarboxylate transporter inhibitor alpha‑cyano‑4‑hydroxycinnamic acid (4CIN). Micropunch‑dissected VMN tissue was analyzed by Western blot and ELISA to assess NE‑dependent 4CIN regulation of GAD and GP variant protein expression and NE activity. 4CIN caused 6OHDA‑reversible augmentation of VMN NE content and plasma glucose and counter‑regulatory hormone levels. 6OHDA stimulated basal VMN GAD expression, but prevented 4CIN stimulation of this profile. Neurotoxin inhibited or increased baseline VMN GPmm and GPbb levels, respectively, in non‑4CIN‑injected rats. 6OHDA deterred 4CIN inhibition of GPmm, but did not prevent drug stimulation of GPbb. Results affirm hindbrain lactoprivic regulation of glucostasis. Hindbrain NE exerts opposite effects on VMN GABA transmission during hindbrain lactostasis vs. ‑privation. VMN norepinephrine‑ vs. energy‑sensitive GP variants are subject to dissimilar NE regulation during energy homeostasis, and respond differently to hindbrain lactoprivation.
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Affiliation(s)
- Karen P Briski
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, United States;
| | - Santosh K Mandal
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana at Monroe, United States
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32
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Shaw JC, Crombie GK, Zakar T, Palliser HK, Hirst JJ. Perinatal compromise contributes to programming of GABAergic and glutamatergic systems leading to long-term effects on offspring behaviour. J Neuroendocrinol 2020; 32:e12814. [PMID: 31758712 DOI: 10.1111/jne.12814] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 10/30/2019] [Accepted: 11/20/2019] [Indexed: 01/01/2023]
Abstract
Extensive evidence now shows that adversity during the perinatal period is a significant risk factor for the development of neurodevelopmental disorders long after the causative event. Despite stemming from a variety of causes, perinatal compromise appears to have similar effects on the developing brain, thereby resulting in behavioural disorders of a similar nature. These behavioural disorders occur in a sex-dependent manner, with males affected more by externalising behaviours such as attention deficit hyperactivity disorder (ADHD) and females by internalising behaviours such as anxiety. Regardless of the causative event or the sex of the offspring, these disorders may begin in childhood or adolescence but extend into adulthood. A mechanism by which adverse events in the perinatal period impact later in life behaviour has been shown to be the changing epigenetic landscape. Methylation of the GAD1/GAD67 gene, which encodes the key glutamate-to-GABA-synthesising enzyme glutamate decarboxylase 1, resulting in increased levels of glutamate, is one epigenetic mechanism that may account for a tendency towards excitation in disorders such as ADHD. Exposure of the fetus or the neonate to high levels of cortisol may be the mediator between perinatal compromise and poor behavioural outcomes because evidence suggests that increased glucocorticoid exposure triggers widespread changes in the epigenetic landscape. This review summarises the current evidence and recent literature about the impact of various perinatal insults on the epigenome and the common mechanisms that may explain the similarity of behavioural outcomes occurring following diverse perinatal compromise.
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Affiliation(s)
- Julia C Shaw
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, Australia
- Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton Heights, NSW, Australia
| | - Gabrielle K Crombie
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, Australia
- Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton Heights, NSW, Australia
| | - Tamas Zakar
- Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton Heights, NSW, Australia
- School of Medicine and Public Health, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, Australia
| | - Hannah K Palliser
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, Australia
- Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton Heights, NSW, Australia
| | - Jonathan J Hirst
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, Australia
- Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton Heights, NSW, Australia
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33
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Fang Q, Chou XL, Peng B, Zhong W, Zhang LI, Tao HW. A Differential Circuit via Retino-Colliculo-Pulvinar Pathway Enhances Feature Selectivity in Visual Cortex through Surround Suppression. Neuron 2019; 105:355-369.e6. [PMID: 31812514 DOI: 10.1016/j.neuron.2019.10.027] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 08/15/2019] [Accepted: 10/17/2019] [Indexed: 01/06/2023]
Abstract
In the mammalian visual system, information from the retina streams into parallel bottom-up pathways. It remains unclear how these pathways interact to contribute to contextual modulation of visual cortical processing. By optogenetic inactivation and activation of mouse lateral posterior nucleus (LP) of thalamus, a homolog of pulvinar, or its projection to primary visual cortex (V1), we found that LP contributes to surround suppression of layer (L) 2/3 responses in V1 by driving L1 inhibitory neurons. This results in subtractive suppression of visual responses and an overall enhancement of orientation, direction, spatial, and size selectivity. Neurons in V1-projecting LP regions receive bottom-up input from the superior colliculus (SC) and respond preferably to non-patterned visual noise. The noise-dependent LP activity allows V1 to "cancel" noise effects and maintain its orientation selectivity under varying noise background. Thus, the retina-SC-LP-V1 pathway forms a differential circuit with the canonical retino-geniculate pathway to achieve context-dependent sharpening of visual representations.
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Affiliation(s)
- Qi Fang
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA; Graduate Program in Neuroscience, University of Southern California, Los Angeles, CA 90089, USA
| | - Xiao-Lin Chou
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA; Graduate Program in Neuroscience, University of Southern California, Los Angeles, CA 90089, USA
| | - Bo Peng
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA; Graduate Program in Neuroscience, University of Southern California, Los Angeles, CA 90089, USA
| | - Wen Zhong
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA
| | - Li I Zhang
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA; Department of Physiology and Neuroscience, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA.
| | - Huizhong Whit Tao
- Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA; Department of Physiology and Neuroscience, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA.
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Lamb-Echegaray ID, Noftz WA, Stinson JPC, Gabriele ML. Shaping of discrete auditory inputs to extramodular zones of the lateral cortex of the inferior colliculus. Brain Struct Funct 2019; 224:3353-3371. [PMID: 31729553 DOI: 10.1007/s00429-019-01979-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 11/05/2019] [Indexed: 12/15/2022]
Abstract
The multimodal lateral cortex of the inferior colliculus (LCIC) exhibits a modular-extramodular micro-organization that is evident early in development. In addition to a set of neurochemical markers that reliably highlight its modular-extramodular organization (e.g. modules: GAD67-positive, extramodular zones: calretinin-positive, CR), mature projection patterns suggest that major LCIC afferents recognize and adhere to such a framework. In adult mice, distinct afferent projections appear segregated, with somatosensory inputs targeting LCIC modules and auditory inputs surrounding extramodular fields. Currently lacking is an understanding regarding the development and shaping of multimodal LCIC afferents with respect to its emerging modular-extramodular microarchitecture. Combining living slice tract-tracing and immunocytochemical approaches in GAD67-GFP knock-in mice, the present study characterizes the critical period of projection shaping for LCIC auditory afferents arising from its neighboring central nucleus (CNIC). Both crossed and uncrossed projection patterns exhibit LCIC extramodular mapping characteristics that emerge from initially diffuse distributions. Projection mismatch with GAD-defined modules and alignment with encompassing extramodular zones becomes increasingly clear over the early postnatal period (birth to postnatal day 12). CNIC inputs terminate almost exclusively in extramodular zones that express CR. These findings suggest multimodal LCIC inputs may initially be sparse and intermingle, prior to segregation into distinct processing streams. Future experiments are needed to determine the likely complex interactions and mechanisms (e.g. activity-dependent and independent) responsible for shaping early modality-specific LCIC circuits.
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Affiliation(s)
- Isabel D Lamb-Echegaray
- Department of Biology, James Madison University, MSC 7801, 951 Carrier Drive, Harrisonburg, VA, 22807, USA
| | - William A Noftz
- Department of Biology, James Madison University, MSC 7801, 951 Carrier Drive, Harrisonburg, VA, 22807, USA
- School of Biomedical Sciences, Kent State University, Kent, OH, USA
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown, OH, USA
| | - Jeremiah P C Stinson
- Department of Biology, James Madison University, MSC 7801, 951 Carrier Drive, Harrisonburg, VA, 22807, USA
| | - Mark L Gabriele
- Department of Biology, James Madison University, MSC 7801, 951 Carrier Drive, Harrisonburg, VA, 22807, USA.
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Singh Y, Leinonen H, Fazaludeen F, Jaronen M, Guest D, Buckley N, Byts N, Oksa P, Jalkanen K, Iqbal I, Huuskonen M, Savchenko E, Keksa-Goldsteine V, Chew S, Myllyharju J, Tanila H, Ooi L, Koistinaho J, Kanninen KM, Malm T. Loss of Cln5 leads to altered Gad1 expression and deficits in interneuron development in mice. Hum Mol Genet 2019; 28:3309-3322. [PMID: 31294445 DOI: 10.1093/hmg/ddz165] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 06/06/2019] [Accepted: 07/08/2019] [Indexed: 11/13/2022] Open
Abstract
The Finnish-variant late infantile neuronal ceroid lipofuscinosis, also known as CLN5 disease, is caused by mutations in the CLN5 gene. Cln5 is strongly expressed in the developing brain and expression continues into adulthood. CLN5, a protein of unknown function, is implicated in neurodevelopment but detailed investigation is lacking. Using Cln5-/- embryos of various ages and cells harvested from Cln5-/- brains we investigated the hitherto unknown role of Cln5 in the developing brain. Loss of Cln5 results in neuronal differentiation deficits and delays in interneuron development during in utero period. Specifically, the radial thickness of dorsal telencephalon was significantly decreased in Cln5-/- mouse embryos at embryonic day 14.5 (E14.5), and expression of Tuj1, an important neuronal marker during development, was down-regulated. An interneuron marker calbindin and a mitosis marker p-H3 showed down-regulation in ganglionic eminences. Neurite outgrowth was compromised in primary cortical neuronal cultures derived from E16 Cln5-/- embryos compared with WT embryos. We show that the developmental deficits of interneurons may be linked to increased levels of the repressor element 1-silencing transcription factor, which we report to bind to glutamate decarboxylase (Gad1), which encodes GAD67, a rate-limiting enzyme in the production of gamma-aminobutyric acid (GABA). Indeed, adult Cln5-/- mice presented deficits in hippocampal parvalbumin-positive interneurons. Furthermore, adult Cln5-/- mice presented deficits in hippocampal parvalbumin-positive interneurons and showed age-independent cortical hyper excitability as measured by electroencephalogram and auditory-evoked potentials. This study highlights the importance of Cln5 in neurodevelopment and suggests that in contrast to earlier reports, CLN5 disease is likely to develop during embryonic stages.
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Affiliation(s)
- Yajuvinder Singh
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Henri Leinonen
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
- Department of Ophthalmology, School of Medicine, University of California Irvine, Irvine, CA, USA
| | - Feroze Fazaludeen
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Merja Jaronen
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Debbie Guest
- Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk CB8 7UU, UK
| | - Noel Buckley
- Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford, OX3 7JX, UK
| | - Nadiya Byts
- Oulu Centre for Cell Matrix Research, Biocenter Oulu and Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Petra Oksa
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Kari Jalkanen
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Imran Iqbal
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Mikko Huuskonen
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Ekaterina Savchenko
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Velta Keksa-Goldsteine
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Sweelin Chew
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Johanna Myllyharju
- Oulu Centre for Cell Matrix Research, Biocenter Oulu and Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland
| | - Heikki Tanila
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Lezanne Ooi
- Illawarra Health and Medical Research Institute, School of Biological Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Jari Koistinaho
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
- Neuroscience Center, Helsinki Institute of Life Science, University of Helsinki, Helsinki Finland
| | - Katja M Kanninen
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Tarja Malm
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
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Shigemura N, Takai S, Hirose F, Yoshida R, Sanematsu K, Ninomiya Y. Expression of Renin-Angiotensin System Components in the Taste Organ of Mice. Nutrients 2019; 11:nu11092251. [PMID: 31546789 PMCID: PMC6770651 DOI: 10.3390/nu11092251] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 09/13/2019] [Accepted: 09/15/2019] [Indexed: 12/20/2022] Open
Abstract
The systemic renin-angiotensin system (RAS) is an important regulator of body fluid and sodium homeostasis. Angiotensin II (AngII) is a key active product of the RAS. We previously revealed that circulating AngII suppresses amiloride-sensitive salt taste responses and enhances the responses to sweet compounds via the AngII type 1 receptor (AT1) expressed in taste cells. However, the molecular mechanisms underlying the modulation of taste function by AngII remain uncharacterized. Here we examined the expression of three RAS components, namely renin, angiotensinogen, and angiotensin-converting enzyme-1 (ACE1), in mouse taste tissues. We found that all three RAS components were present in the taste buds of fungiform and circumvallate papillae and co-expressed with αENaC (epithelial sodium channel α-subunit, a salt taste receptor) or T1R3 (taste receptor type 1 member 3, a sweet taste receptor component). Water-deprived mice exhibited significantly increased levels of renin expression in taste cells (p < 0.05). These results indicate the existence of a local RAS in the taste organ and suggest that taste function may be regulated by both locally-produced and circulating AngII. Such integrated modulation of peripheral taste sensitivity by AngII may play an important role in sodium/calorie homeostasis.
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Affiliation(s)
- Noriatsu Shigemura
- Section of Oral Neuroscience, Graduate School of Dental Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
- Division of Sensory Physiology, Development Center for Five-Sense Devices, Kyushu University, Fukuoka 819-0395, Japan.
| | - Shingo Takai
- Section of Oral Neuroscience, Graduate School of Dental Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
| | - Fumie Hirose
- Section of Oral Neuroscience, Graduate School of Dental Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
- Section of Orthodontics and Dentofacial Orthopedics, Division of Oral Health, Growth, and Development, Faculty of Dental Science, Kyushu University, Fukuoka 812-8582, Japan.
| | - Ryusuke Yoshida
- Section of Oral Neuroscience, Graduate School of Dental Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
- Department of Oral Physiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8525, Japan.
| | - Keisuke Sanematsu
- Section of Oral Neuroscience, Graduate School of Dental Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
- Division of Sensory Physiology, Development Center for Five-Sense Devices, Kyushu University, Fukuoka 819-0395, Japan.
| | - Yuzo Ninomiya
- Section of Oral Neuroscience, Graduate School of Dental Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
- Division of Sensory Physiology, Development Center for Five-Sense Devices, Kyushu University, Fukuoka 819-0395, Japan.
- Monell Chemical Senses Center, Philadelphia, PA 19104, USA.
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Tsuboi M, Kondo K, Masuda K, Tange S, Kajiura K, Kohmoto T, Takizawa H, Imoto I, Tangoku A. Prognostic significance of GAD1 overexpression in patients with resected lung adenocarcinoma. Cancer Med 2019; 8:4189-4199. [PMID: 31207151 PMCID: PMC6675743 DOI: 10.1002/cam4.2345] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 05/27/2019] [Accepted: 05/31/2019] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND AND OBJECTIVES In a previous genome-wide screening, we identified hypermethylated CpG islands around glutamate decarboxylase 1 (GAD1) in lung adenocarcinoma (LADC). In this study, we aimed to investigate the methylation and expression status of GAD1 and its prognostic value in patients with LADC. METHODS GAD1 methylation and mRNA expression status were analyzed using 33 tumorous and paired non-tumorous LADC samples and publicly available datasets. The prognostic value of GAD1 overexpression was investigated using publicly available datasets of mRNA levels and 162 cases of LADC by immunohistochemistry. RESULTS The methylation and mRNA expression levels of GAD1, each having a positive correlation, were significantly higher in LADC tumors than in paired non-tumorous tissues. LADC patients with higher GAD1 mRNA expression showed significantly poorer prognosis for overall survival in publicly available datasets. Higher immunoreactivity of GAD1 was significantly associated with the pathological stage, pleural invasion, lymph vessel invasion, and poorer prognosis for cancer-specific and disease-free survival. Multivariate analysis revealed that GAD1 protein overexpression is an independent prognosticator for disease-free survival. CONCLUSIONS GAD1 mRNA and protein expression levels were significant prognostic factors in LADC, suggesting that they might be useful biomarkers to stratify patients with worse clinical outcomes after resection.
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Affiliation(s)
- Mitsuhiro Tsuboi
- Department of Thoracic, Endocrine Surgery and Oncology, Institute of Biomedical SciencesTokushima University Graduate SchoolTokushimaJapan
| | - Kazuya Kondo
- Department of Oncological Medical Services, Institute of Biomedical SciencesTokushima University Graduate SchoolTokushimaJapan
| | - Kiyoshi Masuda
- Department of Human Genetics, Institute of Biomedical SciencesTokushima University Graduate SchoolTokushimaJapan
- Kawasaki Medical SchoolKurashikiJapan
| | - Shoichiro Tange
- Department of Human Genetics, Institute of Biomedical SciencesTokushima University Graduate SchoolTokushimaJapan
| | - Koichiro Kajiura
- Department of Thoracic, Endocrine Surgery and Oncology, Institute of Biomedical SciencesTokushima University Graduate SchoolTokushimaJapan
| | - Tomohiro Kohmoto
- Department of Human Genetics, Institute of Biomedical SciencesTokushima University Graduate SchoolTokushimaJapan
| | - Hiromitsu Takizawa
- Department of Thoracic, Endocrine Surgery and Oncology, Institute of Biomedical SciencesTokushima University Graduate SchoolTokushimaJapan
| | - Issei Imoto
- Department of Human Genetics, Institute of Biomedical SciencesTokushima University Graduate SchoolTokushimaJapan
- Division of Molecular GeneticsAichi Cancer Center Research InstituteNagoyaJapan
- Department of Cancer GeneticsNagoya University Graduate School of MedicineNagoyaJapan
| | - Akira Tangoku
- Department of Thoracic, Endocrine Surgery and Oncology, Institute of Biomedical SciencesTokushima University Graduate SchoolTokushimaJapan
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Szendy M, Kalkhof S, Bittrich S, Kaiser F, Leberecht C, Labudde D, Noll M. Structural change in GadD2 of Listeria monocytogenes field isolates supports nisin resistance. Int J Food Microbiol 2019; 305:108240. [PMID: 31202151 DOI: 10.1016/j.ijfoodmicro.2019.108240] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 03/15/2019] [Accepted: 05/29/2019] [Indexed: 11/19/2022]
Abstract
The lantibiotic nisin is used as a food additive to effectively inactivate a broad spectrum of Gram-positive bacteria such as Listeria monocytogenes. In total, 282 L. monocytogenes field isolates from German ready-to-eat food products, food-processing environments and patient samples and 39 Listeria reference strains were evaluated for their susceptibility to nisin. The MIC90 value was <1500 IU ml-1. Whole genome sequences (WGS) of four nisin susceptible (NS; growth <200 IU ml-1) and two nisin resistant L. monocytogenes field isolates (NR; growth >1500 IU ml-1) of serotype IIa were analyzed for DNA sequence variants (DSVs) in genes putatively associated with NR and its regulation. WGS of NR differed from NS in the gadD2 gene encoding for the glutamate decarboxylase system (GAD). Moreover, homology modeling predicted a protein structure of GadD2 in NR that promoted a less pH dependent GAD activity and may therefore be beneficial for nisin resistance. Likewise NR had a significant faster growth rate compared to NS in presence of nisin at pH 7. In conclusion, results contributed to ongoing debate that a genetic shift in GAD supports NR state.
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Affiliation(s)
- Maik Szendy
- Coburg University of Applied Sciences and Arts, Institute for Bioanalysis, Friedrich-Streib-Str. 2, D-96450 Coburg, Germany
| | - Stefan Kalkhof
- Coburg University of Applied Sciences and Arts, Institute for Bioanalysis, Friedrich-Streib-Str. 2, D-96450 Coburg, Germany; Fraunhofer Institute for Cell Therapy and Immunology, Protein Biomarker Unit, Perlickstr. 1, D-04103 Leipzig, Germany
| | - Sebastian Bittrich
- University of Applied Sciences Mittweida, Department of Bioinformatics, Technikumplatz 17, D-09648 Mittweida, Germany; Biotechnology Center (BIOTEC), TU Dresden, Tatzberg 47-49, D-01307 Dresden, Germany
| | - Florian Kaiser
- University of Applied Sciences Mittweida, Department of Bioinformatics, Technikumplatz 17, D-09648 Mittweida, Germany; Biotechnology Center (BIOTEC), TU Dresden, Tatzberg 47-49, D-01307 Dresden, Germany
| | - Christoph Leberecht
- University of Applied Sciences Mittweida, Department of Bioinformatics, Technikumplatz 17, D-09648 Mittweida, Germany; Biotechnology Center (BIOTEC), TU Dresden, Tatzberg 47-49, D-01307 Dresden, Germany
| | - Dirk Labudde
- University of Applied Sciences Mittweida, Department of Bioinformatics, Technikumplatz 17, D-09648 Mittweida, Germany
| | - Matthias Noll
- Coburg University of Applied Sciences and Arts, Institute for Bioanalysis, Friedrich-Streib-Str. 2, D-96450 Coburg, Germany.
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Koopman ADM, Beulens JW, Voerman E, Rauh SP, van der Heijden AA, McDonald TJ, Langendoen-Gort M, Rutters F. The association between GAD65 antibody levels and incident Type 2 Diabetes Mellitus in an adult population: A meta-analysis. Metabolism 2019; 95:1-7. [PMID: 30853448 DOI: 10.1016/j.metabol.2019.03.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 02/20/2019] [Accepted: 03/06/2019] [Indexed: 11/15/2022]
Abstract
CONTEXT Antibodies to the 65 kD isoform of glutamic acid decarboxylase (GAD65) have been associated with incident Type 2 Diabetes Mellitus, however results are inconsistent. OBJECTIVE To assess the association between GAD65 antibody positivity and incident Type 2 Diabetes Mellitus in a non-diabetic adult (≥18 years) population, in a systematic review and meta-analysis. DATA SOURCES A systematic literature search was conducted in Pubmed (MEDLINE) and Embase until January 14th, 2019. STUDY SELECTION Included studies were 1) prospective studies on the association between GAD65 antibodies and incident Type 2 Diabetes Mellitus; 2) in a non-diabetic adult (≥18 years) population. To strengthen the review, unpublished data from 1302 Hoorn Study participants were included. DATA EXTRACTION Data extraction and quality assessment were performed independently by two observers. Ten studies were rated for methodological quality and seven were pooled using a random-effects meta-analysis, of which 2 strong, 2 moderate and 3 of low methodological quality. DATA SYNTHESIS The pooled risk estimate of incident Type 2 Diabetes Mellitus for GAD65 antibody positivity, compared to GAD65 antibody negativity was 3.36 (95% CI: 1.9-5.9). This result was robust to sensitivity analyses. Heterogeneity between studies was significant with I2 statistic of 79% (p < 0.0001). However, excluding one study showed a decrease of I2 to 19% (p < 0.0001), explaining a large part of the heterogeneity. CONCLUSION GAD65 antibody positivity was associated with an increased risk of future Type 2 Diabetes Mellitus in adults.
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Affiliation(s)
- Anitra D M Koopman
- Amsterdam UMC, Department of Epidemiology and Biostatistics, Amsterdam Public Health Research Institute, Amsterdam, the Netherlands.
| | - Joline W Beulens
- Amsterdam UMC, Department of Epidemiology and Biostatistics, Amsterdam Public Health Research Institute, Amsterdam, the Netherlands; Julius Centre for Health Sciences and Primary Care, University Medical Centre Utrecht, the Netherlands
| | - Ellis Voerman
- Amsterdam UMC, Department of Epidemiology and Biostatistics, Amsterdam Public Health Research Institute, Amsterdam, the Netherlands
| | - Simone P Rauh
- Amsterdam UMC, Department of Epidemiology and Biostatistics, Amsterdam Public Health Research Institute, Amsterdam, the Netherlands
| | - Amber A van der Heijden
- Amsterdam UMC, Department of General Practice, Amsterdam Public Health Research Institute, Amsterdam, the Netherlands
| | - Timothy J McDonald
- Academic Department of Clinical Biochemistry, University of Exeter Medical School and Royal Devon and Exeter NHS Foundation Trust, Exeter, UK
| | - Marlous Langendoen-Gort
- Amsterdam UMC, Department of General Practice, Amsterdam Public Health Research Institute, Amsterdam, the Netherlands
| | - Femke Rutters
- Amsterdam UMC, Department of Epidemiology and Biostatistics, Amsterdam Public Health Research Institute, Amsterdam, the Netherlands
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Korutla L, Rickels MR, Hu RW, Freas A, Reddy S, Habertheuer A, Harmon J, Korutla V, Ram C, Naji A, Vallabhajosyula P. Noninvasive diagnosis of recurrent autoimmune type 1 diabetes after islet cell transplantation. Am J Transplant 2019; 19:1852-1858. [PMID: 30801971 PMCID: PMC7043773 DOI: 10.1111/ajt.15322] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 02/06/2019] [Accepted: 02/11/2019] [Indexed: 01/25/2023]
Abstract
Islet cell transplantation is curative therapy for patients with complicated autoimmune type 1 diabetes (T1D). We report the diagnostic potential of circulating transplant islet-specific exosomes to noninvasively distinguish pancreatic β cell injury secondary to recurrent autoimmunity vs immunologic rejection. A T1D patient with hypoglycemic unawareness underwent islet transplantation and maintained normoglycemia until posttransplant day 1098 before requiring exogenous insulin. Plasma analysis showed decreased donor islet exosome quantities on day 1001, before hyperglycemia onset. This drop in islet exosome quantity signified islet injury, but did not distinguish injury type. However, analysis of purified transplant islet exosome cargoes showed decrease in insulin-containing exosomes, but not glucagon-containing exosomes, indicating selective destruction of transplanted β cells secondary to recurrent T1D autoimmunity. Furthermore, donor islet exosome cargo analysis showed time-specific increase in islet autoantigen, glutamic acid decarboxylase 65 (GAD65), implicated in T1D autoimmunity. Time-matched analysis of plasma transplant islet exosomes in 3 control subjects undergoing islet cell transplantation failed to show changes in islet exosome quantities or intraexosomal cargo expression of insulin, glucagon, and GAD65. This is the first report of noninvasive diagnosis of recurrent autoimmunity after islet cell transplantation, suggesting that transplant tissue exosome platform may serve as a biomarker in islet transplant diagnostics.
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Affiliation(s)
- Laxminarayana Korutla
- Division of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Michael R. Rickels
- Division of Endocrinology, Diabetes & Metabolism, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
- Institute for Diabetes, Obesity & Metabolism, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Robert W. Hu
- Division of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Andrew Freas
- Division of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Sanjana Reddy
- Division of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Andreas Habertheuer
- Division of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Joey Harmon
- Division of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Varun Korutla
- Division of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Chirag Ram
- Division of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Ali Naji
- Institute for Diabetes, Obesity & Metabolism, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
- Division of Transplantation, Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Prashanth Vallabhajosyula
- Division of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
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Mo Q, Mao A, Li Y, Shi G. Substrate inactivation of bacterial L-aspartate α-decarboxylase from Corynebacterium jeikeium K411 and improvement of molecular stability by saturation mutagenesis. World J Microbiol Biotechnol 2019; 35:62. [PMID: 30923994 DOI: 10.1007/s11274-019-2629-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 03/08/2019] [Indexed: 12/28/2022]
Abstract
Bacterial L-aspartate α-decarboxylase (PanD) is a potential biocatalyst for the green production of β-alanine, an important block chemical for manufacturing nitrogen-containing chemicals in bio-refinery field. It was reported that the poor catalytic stability caused by substrate inactivation limited the large-scale application. Here, we investigated the characters of inactivation by L-aspartate of PanD from Corynebacterium jeikeium (PDCjei), and found that L-aspartate induced a time-, and concentration-dependent inactivation of PDCjei with the values of KI and kinact being 288.4 mM and 0.235/min, respectively. To improve the catalytic stability of PDCjei, conserved amino acid residues essential to catalytic stability were analyzed by comparing the discrepancy in the observed inactivation rate of various sources. By an efficient colorimetric high-throughput screening method, four mutants with 3.18-24.69% higher activity were obtained from mutant libraries. Among them, the best mutation (R3K) also performed 66.38% higher catalytic stability than the wild type, showing great potential for industrial bio-production of β-alanine.
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Affiliation(s)
- Qin Mo
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - An Mao
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Youran Li
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Guiyang Shi
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China.
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China.
- Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China.
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42
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Imam S, Prathibha R, Dar P, Almotah K, Al-Khudhair A, Hasan SAM, Salim N, Jilani TN, Mirmira RG, Jaume JC. eIF5A inhibition influences T cell dynamics in the pancreatic microenvironment of the humanized mouse model of Type 1 Diabetes. Sci Rep 2019; 9:1533. [PMID: 30733517 PMCID: PMC6367423 DOI: 10.1038/s41598-018-38341-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 12/17/2018] [Indexed: 12/14/2022] Open
Abstract
We have developed a transgenic mouse model of Type 1 Diabetes (T1D) in which human GAD65 is expressed in pancreatic β-cells, and human MHC-II is expressed on antigen presenting cells. Induced GAD65 antigen presentation activates T-cells, which initiates the downstream events leading to diabetes. In our humanized mice, we have shown downregulation of eukaryotic translation initiation factor 5 A (elF5A), expressed only in actively dividing mammalian cells. In-vivo inhibition of elF5A hypusination by deoxyhypusine synthase (DHS) inhibitor "GC7" was studied; DHS inhibitor alters the pathophysiology in our mouse model by catalyzing the crucial hypusination and the rate-limiting step of elF5A activation. In our mouse model, we have shown that inhibition of eIF5A resets the pro-inflammatory bias in the pancreatic microenvironment. There was: (a) reduction of Th1/Th17 response, (b) an increase in Treg numbers, (c) debase in IL17 and IL21 cytokines levels in serum, (d) lowering of anti-GAD65 antibodies, and (e) ablation of the ER stress that improved functionality of the β-cells, but minimal effect on the cytotoxic CD8 T-cell (CTL) mediated response. Conclusively, immune modulation, in the case of T1D, may help to manipulate inflammatory responses, decreasing disease severity, and may help manage T1D in early stages of disease. Our study also demonstrates that without manipulating the CTLs mediated response extensively, it is difficult to treat T1D.
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Affiliation(s)
- Shahnawaz Imam
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA.
- Center for Diabetes and Endocrine Research (CeDER), Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA.
| | - R Prathibha
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
- Center for Diabetes and Endocrine Research (CeDER), Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
| | - Pervaiz Dar
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
- Center for Diabetes and Endocrine Research (CeDER), Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
- Faculty of Veterinary Sciences and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir (SKUAST-K), Shuhama, Srinagar, 190006, Jammu and Kashmir, India
| | - Khalil Almotah
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
- Center for Diabetes and Endocrine Research (CeDER), Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
| | - Ahmed Al-Khudhair
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
- Center for Diabetes and Endocrine Research (CeDER), Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
| | - Syed Abdul-Moiz Hasan
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
- Center for Diabetes and Endocrine Research (CeDER), Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
| | - Nancy Salim
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
- Center for Diabetes and Endocrine Research (CeDER), Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
| | - Talha Naser Jilani
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
- Center for Diabetes and Endocrine Research (CeDER), Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA
| | - Raghavendra G Mirmira
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Juan Carlos Jaume
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA.
- Center for Diabetes and Endocrine Research (CeDER), Department of Medicine, College of Medicine and Life Sciences, University of Toledo, Toledo, OH, USA.
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Ziobrowska-Bech A, Winther-Larsen A, Kremke B, Parkner T, Soendersoe Knudsen C. Reference limits for GAD65 and IA-2 autoantibodies by chemiluminescence immunoassay in Northern European adults and children. Scand J Clin Lab Invest 2019; 79:123-125. [PMID: 30727763 DOI: 10.1080/00365513.2019.1566566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 11/04/2018] [Accepted: 01/02/2019] [Indexed: 06/09/2023]
Abstract
The GAD65 and IA-2 antibodies (Abs) are biomarkers of the development of type 1 diabetes mellitus (T1DM) in both children and adults. The upper reference limit for the autoantibodies made by the manufacture was established on an adult Chinese population. Here, we established upper reference limits for Northern European adults and children in accordance with the Clinical and Laboratory Standards Institute (CLSI) guidelines. Serum samples from healthy Danish children (0-18 years) and adults (18-70 years) were analysed for GAD65Ab and IA-2Ab using MAGLUMI 800 Chemiluminescence Immunoassay (CLIA). The Kruskal-Wallis test was used for evaluating differences between gender and age groups. No gender or age differences were found for neither GAD65Ab nor IA-2Ab, and a combined upper reference limit for both children and adults could be established. An upper reference limit of 5.1 IU/mL was defined for GAD65Ab and 11.5 U/mL for IA-2Ab. Our results showed a substantial discrepancy with the reference limits established by the manufacturer.
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Affiliation(s)
- Agnes Ziobrowska-Bech
- a Department of Clinical Biochemistry , Aarhus University Hospital , Aarhus , Denmark
- b Department of Clinical Biochemistry , Aalborg University Hospital , Aalborg , Denmark
| | - Anne Winther-Larsen
- a Department of Clinical Biochemistry , Aarhus University Hospital , Aarhus , Denmark
| | - Britta Kremke
- c Department of Paediatrics , Regionshospitalet Randers , Randers , Denmark
| | - Tina Parkner
- a Department of Clinical Biochemistry , Aarhus University Hospital , Aarhus , Denmark
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Abstract
Pancreatic islets play an essential role in regulating blood glucose levels. Age-dependent development of glucose intolerance and insulin resistance results in hyperglycemia, which in turn stimulates insulin synthesis and secretion from aged islets, to fulfill the increased demand for insulin. However, the mechanism underlying enhanced insulin secretion remains unknown. Glutamic acid decarboxylase 67 (GAD67) catalyzes the conversion of glutamate into γ-aminobutyric acid (GABA) and CO2. Both glutamate and GABA can affect islet function. Here, we investigated the role of GAD67 in insulin secretion in young (3 month old) and aged (24 month old) C57BL/6J male mice. Unlike young mice, aged mice displayed glucose-intolerance and insulin-resistance. However, aged mice secreted more insulin and showed lower fed blood glucose levels than young mice. GAD67 levels in primary islets increased with aging and in response to high glucose levels. Inhibition of GAD67 activity using a potent inhibitor of GAD, 3-mercaptopropionic acid, abrogated glucose-stimulated insulin secretion from a pancreatic β-cell line and from young and aged islets. Collectively, our results suggest that blood glucose levels regulate GAD67 expression, which contributes to β-cell responses to impaired glucose homeostasis caused by advanced aging.
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Affiliation(s)
- Jung Hoon Cho
- School of Interdisciplinary Bioscience and Bioengineering, POSTECH, Pohang, Korea
- Center for Plant Aging Research, Institute for Basic Science, Daegu, Korea
| | - Kyeong-Min Lee
- Laboratory of Biochemistry and Cellular Engineering, DGIST, Daegu, Korea
| | - Yun-Il Lee
- Well Aging Research Center, DGIST, Daegu, Korea
| | - Hong Gil Nam
- Center for Plant Aging Research, Institute for Basic Science, Daegu, Korea
- Department of New Biology, DGIST, Daegu, Korea
| | - Won Bae Jeon
- Laboratory of Biochemistry and Cellular Engineering, DGIST, Daegu, Korea
- Department of New Biology, DGIST, Daegu, Korea
- CONTACT Won Bae Jeon Laboratory of Biochemistry and Cellular Engineering, DGIST, Daegu 42988, Korea
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Li X, Zhang J, Niu R, Manthari RK, Yang K, Wang J. Effect of fluoride exposure on anxiety- and depression-like behavior in mouse. Chemosphere 2019; 215:454-460. [PMID: 30336322 DOI: 10.1016/j.chemosphere.2018.10.070] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 09/29/2018] [Accepted: 10/11/2018] [Indexed: 05/27/2023]
Abstract
We established the mouse model of fluoride (68 mg F ion/L deionized water) exposure for 90 days, 120 days and 150 days, and applied diverse methods as behavioral models of anxiety and depression, and analyzed the levels of the anxiety- and depression-like related genes like BDNF1, BDNF4, 5-HT1A, VGLUT, GAD67, and VGAT in the mouse hippocampus. In the mice exposed to NaF for 120 days, compared to the control group, chalky opacity was observed on the enamel of teeth; the results of anxiety-like behavior, like elevated zero maze, light/dark exploration test, novel object recognition test and emergence test were significantly altered, however in the mice exposed for 150 days, only the elevated zero maze and emergence test were significantly altered. Also, the results of depression-like behavior were significantly altered in the 120 days treated mice. Exposure to NaF for 120 days significantly decreased the mRNA expression levels of the BDNF4 with a concomitant increase in the 5-HT1A compared to the control mice. Especially the mRNA expression levels of GAD67 and VGAT were significantly decreased in all the three NaF treated groups. However, no significant changes were observed in the mRNA expression levels of the VGLUT compared to the control mice. In summary, we speculated that fluoride exposure had adverse effects on nervous system, inducing an imbalance between excitation and inhibition, which resulted in abnormal behavior and depression.
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Affiliation(s)
- Xuehua Li
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi 030801, China
| | - Jianmeng Zhang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi 030801, China
| | - Ruiyan Niu
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi 030801, China
| | - Ram Kumar Manthari
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi 030801, China
| | - Kaidong Yang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi 030801, China
| | - Jundong Wang
- Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi 030801, China.
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Magri C, Giacopuzzi E, La Via L, Bonini D, Ravasio V, Elhussiny MEA, Orizio F, Gangemi F, Valsecchi P, Bresciani R, Barbon A, Vita A, Gennarelli M. A novel homozygous mutation in GAD1 gene described in a schizophrenic patient impairs activity and dimerization of GAD67 enzyme. Sci Rep 2018; 8:15470. [PMID: 30341396 PMCID: PMC6195539 DOI: 10.1038/s41598-018-33924-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 10/08/2018] [Indexed: 12/30/2022] Open
Abstract
Recently, by whole exome sequencing of schizophrenia (SCZ) patients, we identified a subject that was homozygous for a novel missense substitution (c.391 A > G) in the glutamate acid decarboxylase 1 (GAD1) gene. GAD1 encodes for GAD67 enzyme, catalyzing the production of gamma-aminobutyric acid (GABA) from L-glutamic acid. Here, we studied the impact of this mutation on GAD67 activity, dimerization and subcellular localization. Biochemical assay revealed that c.391 A > G reduces GAD67 enzymatic activity by ~30%, probably due to the impaired homodimerization of homozygous mutants as highlighted by proximity ligation assays. The mutational screening of 120 genes of the "GABAergic system" in a cohort of 4,225 SCZ cases and 5,834 controls (dbGaP: phs000473.v1.p2), did not identify other cases that were homozygous for ultra-rare variants in GAD1, but highlighted an increased frequency of cases that were homozygous for rare variants in genes of the GABA system (SCZ: 0.14% vs. Controls: 0.00%; p-value = 0.0055). In conclusion, this study demonstrates the functional impact of c.391 A > G variant and its biological effect makes it a good candidate as risk variant for SCZ. This study also supports an involvement of ultra-rare variants in GABAergic genes in the etiopathogenesis of SCZ.
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Affiliation(s)
- Chiara Magri
- Unit of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy.
| | - Edoardo Giacopuzzi
- Unit of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Luca La Via
- Unit of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Daniela Bonini
- Unit of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Viola Ravasio
- Unit of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Mohammed E A Elhussiny
- Unit of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Flavia Orizio
- Unit of Biotechnology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Fabrizio Gangemi
- Unit of Physics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Paolo Valsecchi
- Neuroscience Section, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
- Department of Mental Health, Spedali Civili Hospital, Brescia, Italy
| | - Roberto Bresciani
- Unit of Biotechnology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Alessandro Barbon
- Unit of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Antonio Vita
- Neuroscience Section, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
- Department of Mental Health, Spedali Civili Hospital, Brescia, Italy
| | - Massimo Gennarelli
- Unit of Biology and Genetics, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
- Genetic Unit, IRCCS Centro S. Giovanni di Dio Fatebenefratelli, Brescia, Italy
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Chen S, Li X, Wang Y, Zeng J, Ye C, Li X, Guo L, Zhang S, Yu X. Induction of Escherichia coli into a VBNC state through chlorination/chloramination and differences in characteristics of the bacterium between states. Water Res 2018; 142:279-288. [PMID: 29890476 DOI: 10.1016/j.watres.2018.05.055] [Citation(s) in RCA: 112] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 05/22/2018] [Accepted: 05/29/2018] [Indexed: 05/22/2023]
Abstract
Many pathogens can enter into a viable but nonculturable (VBNC) state in response to harsh environmental stresses. Bacteria in this state can retain certain features of viable cells, such as cellular integrity, metabolic activity, or virulence and may present health risks associated with drinking water. In this study, we investigated the ability of chlorination and chloramination, which are widely used methods to disinfect drinking water, to induce Escherichia coli into a VBNC state. After treatment with chlorine and chloramine at concentrations of 1, 2, 3, and 4 mg/L, the counts of culturable E. coli cells decreased from 106 CFU/mL to 0 CFU/mL at 5-60 min post treatment. Meanwhile, viable cell counts were still approximately 103-105 cells/mL. These viable E. coli cells may be induced into a VBNC state by chlorination and chloramination. Scanning electron microscopy and laser confocal microscopy showed that some bacteria maintained cellular integrity, but the average length of VBNC cells was less than that of culturable cells. Respiratory activity of VBNC cells decreased approximately 50% relative to that of culturable cells. We also used heavy water (D2O) combined with Raman microspectroscopy to show that E. coli in a VBNC state retained metabolic activity involving water (e.g. condensation reactions) at the single-cell level. Furthermore, soxR, gadA, and katG genes remained highly expressed, suggesting that VBNC cells were physiologically active. Finally, resuscitation of VBNC cells induced by chlorine in Luria-Bertani (LB) broth was identified by calculating the generation time. Results of this study will facilitate a better understanding of the health risks associated with VBNC bacteria and the development of more effective strategies for drinking water disinfection.
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Affiliation(s)
- Sheng Chen
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Xi Li
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yahong Wang
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Jie Zeng
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Chengsong Ye
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China
| | - Xianping Li
- College of Environment & Ecology, Xiamen University, Xiamen 361021, PR China
| | - Lizheng Guo
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Shenghua Zhang
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China.
| | - Xin Yu
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China.
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Kirenskaya AV, Storozheva ZI, Gruden MA, Sewell RDE. COMT and GAD1 gene polymorphisms are associated with impaired antisaccade task performance in schizophrenic patients. Eur Arch Psychiatry Clin Neurosci 2018; 268:571-584. [PMID: 29429137 PMCID: PMC6096577 DOI: 10.1007/s00406-018-0881-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2017] [Accepted: 02/04/2018] [Indexed: 12/19/2022]
Abstract
Genetic influences modulating executive functions engaging prefrontal cortical brain systems were investigated in 141 male subjects. The effects of variations in two genes implicated in dopamine and GABA activities in the prefrontal cortex: rs4680 (Val158/Met polymorphism of the catechol-o-methyltransferase gene-COMT) and rs3749034 (C/T) substitution in the promoter region of the glutamic acid decarboxylase gene (GAD1) were studied on antisaccade (AS) performance in healthy subjects and schizophrenic patients. Genotyping revealed a trend towards a reduced proportion of COMT Val/Met heterozygotes and a significantly increased frequency of the GAD1 rs3749034 C allele in schizophrenic patients relative to controls. Patients had elevated error rates, increased AS latencies and increased latency variability (coefficient of variation) compared to controls. The influence of polymorphisms was observed only in patients but not in controls. A substantial effect of the COMT genotype was noted on the coefficient of variation in latency, and this measure was higher in Val homozygotes compared to Met allele carriers (p < 0.05) in the patient group. The outcome from rs3749034 was also disclosed on the error rate (higher in T carriers relative to C homozygotes, p < 0.01) and latency (increased in C homozygotes relative to T carriers, p < 0.01). Binary logistic regression showed that inclusion of the genotype factor (i.e., selective estimation of antisaccade measures in CC carriers) considerably increased the validity of the diagnostic model based on the AS measures. These findings may well be derived from specific genetic associations with prefrontal cortex functioning in schizophrenia.
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Affiliation(s)
- Anna V Kirenskaya
- Federal Medical Research Centre of Psychiatry and Narcology, Kropotkinsky Lane. 23, 119034, Moscow, Russian Federation
| | - Zinaida I Storozheva
- Federal Medical Research Centre of Psychiatry and Narcology, Kropotkinsky Lane. 23, 119034, Moscow, Russian Federation
| | - Marina A Gruden
- Federal State Budgetary Scientific Institution "P. K. Anokhin Research Institute of Normal Physiology", Baltiskaya St., 8, 125315, Moscow, Russian Federation
| | - Robert D E Sewell
- Cardiff School of Pharmacy and Pharmaceutical Sciences, Redwood Building, Cardiff University, Cardiff, CF10 3NB, UK.
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Huang J, Fang H, Gai ZC, Mei JQ, Li JN, Hu S, Lv CJ, Zhao WR, Mei LH. Lactobacillus brevis CGMCC 1306 glutamate decarboxylase: Crystal structure and functional analysis. Biochem Biophys Res Commun 2018; 503:1703-1709. [PMID: 30049439 DOI: 10.1016/j.bbrc.2018.07.102] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Accepted: 07/20/2018] [Indexed: 01/14/2023]
Abstract
Glutamate decarboxylase (GAD), which is a unique pyridoxal 5-phosphate (PLP)-dependent enzyme, can catalyze α-decarboxylation of l-glutamate (L-Glu) to γ-aminobutyrate (GABA). The crystal structure of GAD in complex with PLP from Lactobacillus brevis CGMCC 1306 was successfully solved by molecular-replacement, and refined at 2.2 Å resolution to an Rwork factor of 18.76% (Rfree = 23.08%). The coenzyme pyridoxal 5-phosphate (PLP) forms a Schiff base with the active-site residue Lys279 by continuous electron density map, which is critical for catalysis by PLP-dependent decarboxylase. Gel filtration showed that the active (pH 4.8) and inactive (pH 7.0) forms of GAD are all dimer. The residues (Ser126, Ser127, Cys168, Ile211, Ser276, His278 and Ser321) play important roles in anchoring PLP cofactor inside the active site and supporting its catalytic reactivity. The mutant T215A around the putative substrate pocket displayed an 1.6-fold improvement in catalytic efficiency (kcat/Km) compared to the wild-type enzyme (1.227 mM-1 S-1 versus 0.777 mM-1 S-1), which was the highest activity among all variants tested. The flexible loop (Tyr308-Glu312), which is positioned near the substrate-binding site, is involved in the catalytic reaction, and the conserved residue Tyr308 plays a vital role in decarboxylation of L-Glu.
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Affiliation(s)
- Jun Huang
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou, 310023, PR China; Department of Biological and Pharmaceutical Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo, 315100, PR China
| | - Hui Fang
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou, 310023, PR China
| | - Zhong-Chao Gai
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Jia-Qi Mei
- Department of Chemical Engineering, The University of Utah, Salt Lake City, 84102, Utah, United States
| | - Jia-Nan Li
- College of Pharmacy, Zhejiang University of Technology, Hangzhou, 310014, PR China
| | - Sheng Hu
- Department of Biological and Pharmaceutical Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo, 315100, PR China
| | - Chang-Jiang Lv
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou, 310023, PR China
| | - Wei-Rui Zhao
- Department of Biological and Pharmaceutical Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo, 315100, PR China
| | - Le-He Mei
- Department of Biological and Pharmaceutical Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo, 315100, PR China.
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50
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Abstract
Detection of salient objects in the visual scene is a vital aspect of an animal's interactions with its environment. Here, we show that neurons in the mouse superior colliculus (SC) encode visual saliency by detecting motion contrast between stimulus center and surround. Excitatory neurons in the most superficial lamina of the SC are contextually modulated, monotonically increasing their response from suppression by the same-direction surround to maximal potentiation by an oppositely-moving surround. The degree of this potentiation declines with depth in the SC. Inhibitory neurons are suppressed by any surround at all depths. These response modulations in both neuronal populations are much more prominent to direction contrast than to phase, temporal frequency, or static orientation contrast, suggesting feature-specific saliency encoding in the mouse SC. Together, our findings provide evidence supporting locally generated feature representations in the SC, and lay the foundations towards a mechanistic and evolutionary understanding of their emergence.
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Affiliation(s)
- Jad Barchini
- Department of NeurobiologyNorthwestern UniversityEvanstonUnited States
- Interdepartmental Neuroscience ProgramNorthwestern UniversityEvanstonUnited States
| | - Xuefeng Shi
- Department of NeurobiologyNorthwestern UniversityEvanstonUnited States
- Tianjin Key Laboratory of Ophthalmology and Visual Science, Tianjin Eye Institute, Clinical College of OphthalmologyTianjin Medical UniversityTianjinChina
- Department of Pediatric Ophthalmology and StrabismusTianjin Eye HospitalTianjinChina
| | - Hui Chen
- Department of NeurobiologyNorthwestern UniversityEvanstonUnited States
- Department of PsychologyUniversity of VirginiaCharlottesvilleUnited States
- Department of BiologyUniversity of VirginiaCharlottesvilleUnited States
| | - Jianhua Cang
- Department of NeurobiologyNorthwestern UniversityEvanstonUnited States
- Department of PsychologyUniversity of VirginiaCharlottesvilleUnited States
- Department of BiologyUniversity of VirginiaCharlottesvilleUnited States
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