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Kawaguchi Y, Kawamura Y, Hirose H, Kiyokawa M, Hirate M, Hirata T, Higuchi Y, Futaki S. E3MPH16: An efficient endosomolytic peptide for intracellular protein delivery. J Control Release 2024; 367:877-891. [PMID: 38301930 DOI: 10.1016/j.jconrel.2024.01.067] [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: 11/12/2023] [Revised: 01/22/2024] [Accepted: 01/29/2024] [Indexed: 02/03/2024]
Abstract
To facilitate the introduction of proteins, such as antibodies, into cells, a variety of delivery peptides have been engineered. These peptides are typically highly cationic and somewhat hydrophobic, enabling cytosolic protein delivery at the cost of causing cell damage by rupturing membranes. This balance between delivery effectiveness and cytotoxicity presents obstacles for their real-world use. To tackle this problem, we designed a new endosome-disruptive cytosolic delivery peptide, E3MPH16, inspired by mastoparan X (MP). E3MPH16 was engineered to incorporate three Glu (E3) and 16 His (H16) residues at the N- and C-termini of MP, respectively. The negative charges of E3 substantially mitigate the cell-surface damage induced by MP. The H16 segment is known to enhance cell-surface adsorption and endocytic uptake of the associated molecules. With these modifications, E3MPH16 was successfully trapped within endosomes. The acidification of endosomes is expected to protonate the side chains of E3 and H16, enabling E3MPH16 to rupture endosomal membranes. As a result, nearly 100% of cells achieved cytosolic delivery of a model biomacromolecule, Alexa Fluor 488-labeled dextran (10 kDa), via endosomal escape by co-incubation with E3MPH16. The delivery process also suggested the involvement of macropinocytosis and caveolae-mediated endocytosis. With the assistance of E3MPH16, Cre recombinase and anti-Ras-IgG delivered into HEK293 cells and HT1080 cells enabled gene recombination and inhibited cell proliferation, respectively. The potential for in vivo application of this intracellular delivery method was further validated by topically injecting the green fluorescent protein fused with a nuclear localization signal (NLS-GFP) along with E3MPH16 into Colon-26 tumor xenografts in mice.
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Affiliation(s)
- Yoshimasa Kawaguchi
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
| | - Yuki Kawamura
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Hisaaki Hirose
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Megumi Kiyokawa
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Momo Hirate
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Tsuyoshi Hirata
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yuriko Higuchi
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Shiroh Futaki
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
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Liu D, Yuan M, Wang Y, Zhang L, Yao W, Feng M. Integrated metabolome and transcriptome analysis of differences in quality of ripe Lycium barbarum L. fruits harvested at different periods. BMC Plant Biol 2024; 24:82. [PMID: 38302892 PMCID: PMC10835843 DOI: 10.1186/s12870-024-04751-z] [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: 02/05/2023] [Accepted: 01/16/2024] [Indexed: 02/03/2024]
Abstract
BACKGROUND Wolfberry is well-known for its high nutritional value and medicinal benefits. Due to the continuous ripening nature of Goji berries and the fact that they can be commercially harvested within a few weeks, their phytochemical composition may change during the harvesting process at different periods. RESULT The involved molecular mechanisms of difference in fruit quality of ripe Lycium barbarum L. harvested at four different periods were investigated by transcriptomic and metabolomics analyses for the first time. According to the results we obtained, it was found that the appearance quality of L. barbarum fruits picked at the beginning of the harvesting season was superior, while the accumulation of sugar substances in L. barbarum fruits picked at the end of the harvesting season was better. At the same time the vitamin C and carotenoids content of wolfberry fruits picked during the summer harvesting season were richer. Ascorbic acid, succinic acid, glutamic acid, and phenolic acids have significant changes in transcription and metabolism levels. Through the network metabolic map, we found that ascorbic acid, glutamic acid, glutamine and related enzyme genes were differentially accumulated and expressed in wolfberry fruits at different harvesting periods. Nevertheless, these metabolites played important roles in the ascorbate-glutathione recycling system. Ascorbic acid, phenolic substances and the ascorbate-glutathione recycling system have antioxidant effects, which makes the L. barbarum fruits harvested in the summer more in line with market demand and health care concepts. CONCLUSION This study laid the foundation for understanding the molecular regulatory mechanisms of quality differences of ripe wolfberry fruits harvested at different periods, and provides a theoretical basis for enhancing the quality of L. barbarum fruits.
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Affiliation(s)
- Deshuai Liu
- College of Enology and Horticulture, Ningxia University, Yinchuan, 750021, Ningxia, China
- Ningxia Key Laboratory of Modern Molecular Breeding of Dominant and Characteristic Crops, Yinchuan, 750021, Ningxia, China
| | - Miao Yuan
- College of Enology and Horticulture, Ningxia University, Yinchuan, 750021, Ningxia, China
| | - Ye Wang
- College of Enology and Horticulture, Ningxia University, Yinchuan, 750021, Ningxia, China
- Ningxia Key Laboratory of Modern Molecular Breeding of Dominant and Characteristic Crops, Yinchuan, 750021, Ningxia, China
| | - Li Zhang
- College of Enology and Horticulture, Ningxia University, Yinchuan, 750021, Ningxia, China
| | - Wenkong Yao
- College of Enology and Horticulture, Ningxia University, Yinchuan, 750021, Ningxia, China.
- Ningxia Modern Facility Horticulture Engineering Technology Research Center, Yinchuan, 750021, Ningxia, China.
- Ningxia Key Laboratory of Modern Molecular Breeding of Dominant and Characteristic Crops, Yinchuan, 750021, Ningxia, China.
| | - Mei Feng
- College of Enology and Horticulture, Ningxia University, Yinchuan, 750021, Ningxia, China.
- Ningxia Modern Facility Horticulture Engineering Technology Research Center, Yinchuan, 750021, Ningxia, China.
- Ningxia Key Laboratory of Modern Molecular Breeding of Dominant and Characteristic Crops, Yinchuan, 750021, Ningxia, China.
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Wang J, Wang D, Su Z, Song Y, Zhang J, Xiahou Y. Green synthesis of chitosan/ glutamic acid/agarose/Ag nanocomposite hydrogel as a new platform for colorimetric detection of Cu ions and reduction of 4-nitrophenol. Int J Biol Macromol 2024; 259:129394. [PMID: 38218277 DOI: 10.1016/j.ijbiomac.2024.129394] [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: 11/21/2023] [Revised: 12/26/2023] [Accepted: 01/08/2024] [Indexed: 01/15/2024]
Abstract
In this study, the green synthesis of chitosan/glutamic acid/agarose/Ag (Chi/GA/Aga/Ag) nanocomposite hydrogel was obtained via in situ reduction of Ag ions during the crosslinking process of chitosan-agarose double network hydrogels. The rich hydroxyl, carboxyl and amino groups in both agarose, chitosan, and glutamic acid can effectively control the growth, dispersion and immobilization of nearly spherical Ag nanoparticles (70 nm) in the Chi/GA/Aga/Ag composite hydrogel. Glutamic acids can act as the structure-directing agents to induce the formation of chitosan/glutamic acid hydrogel. The mechanical strength of the Chi/GA/Aga/Ag composite hydrogel can be enhanced by the introduction of chitosan-agarose double network hydrogels, which guarantees that it can be directly used as a visual test strip of the Cu ions with a lower detection limit of 1 μM and an active catalyst for the reduction of 4-nitrophenol within 18 min. The quantitative and semi-quantitative measurement of Cu ions can be carried out by UV-visible absorption spectroscopy and visual measurement, which provided a convenient, portable, and "naked-eye" solid-state detection methodology.
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Affiliation(s)
- Jin Wang
- Heze Branch, Qilu University of Technology (Shandong Academy of Sciences), Heze 274000, China.
| | - Daijie Wang
- Heze Branch, Qilu University of Technology (Shandong Academy of Sciences), Heze 274000, China
| | - Zhi Su
- Heze Branch, Heze Ecological Environment Monitoring Center of Shandong Province, Heze 274000, China
| | - Yahui Song
- Heze Branch, Qilu University of Technology (Shandong Academy of Sciences), Heze 274000, China
| | - Jihui Zhang
- Heze Branch, Qilu University of Technology (Shandong Academy of Sciences), Heze 274000, China
| | - Yujiao Xiahou
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
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Gajewski MP, Barger SW. Design, synthesis, and characterization of novel system x C- transport inhibitors: inhibition of microglial glutamate release and neurotoxicity. J Neuroinflammation 2023; 20:292. [PMID: 38057869 PMCID: PMC10702053 DOI: 10.1186/s12974-023-02972-x] [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: 05/13/2023] [Accepted: 11/28/2023] [Indexed: 12/08/2023] Open
Abstract
Neuroinflammation appears to involve some degree of excitotoxicity promulgated by microglia, which release glutamate via the system xC- (SxC-) cystine-glutamate antiporter. With the aim of mitigating this source of neuronal stress and toxicity, we have developed a panel of inhibitors of the SxC- antiporter. The compounds were based on L-tyrosine, as elements of its structure align with those of glutamate, a primary physiological substrate of the SxC- antiporter. In addition to 3,5-dibromotyrosine, ten compounds were synthesized via amidation of that parent molecule with a selection of acyl halides. These agents were tested for the ability to inhibit release of glutamate from microglia activated with lipopolysaccharide (LPS), an activity exhibited by eight of the compounds. To confirm that the compounds were inhibitors of SxC-, two of them were further tested for the ability to inhibit cystine uptake. Finally, these agents were shown to protect primary cortical neurons from the toxicity exhibited by activated microglia. These agents may hold promise in reducing the neurodegenerative effects of neuroinflammation in conditions, such as encephalitis, traumatic brain injury, stroke, or neurodegenerative diseases.
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Affiliation(s)
- Mariusz P Gajewski
- Department of Physical and Earth Sciences, Arkansas Tech University, McEver Building, 1701 N Boulder Ave, Russellville, AR, 72801, USA.
| | - Steven W Barger
- Departments of Geriatrics and Neurobiology and Developmental Sciences, University of Arkansas for Medical Sciences, Little Rock, AR, USA
- Geriatric Research Education and Clinical Center, Central Arkansas Veterans Healthcare System, Little Rock, AR, USA
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Mennella JA, Smethers AD, Delahanty MT, Stallings VA, Trabulsi JC. Glutamic acid intake by formula-fed infants: are acceptable daily intakes appropriate? Eur J Pediatr 2023; 182:5701-5705. [PMID: 37776354 PMCID: PMC10746772 DOI: 10.1007/s00431-023-05215-6] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 09/11/2023] [Accepted: 09/15/2023] [Indexed: 10/02/2023]
Abstract
The 2017 European Food Safety Authority (EFSA) recommendation of an acceptable daily intake (ADI) of 30 mg glutamic acid/kg bw/day did not take into consideration the primary energy sources during infancy, including infant formulas. In the present study, we determined total daily intakes of glutamic acid in a contemporary cohort of healthy infants who were fed either cow milk formula (CMF) or extensive protein hydrolysate formula (EHF); the formulas differed substantially in glutamic acid content. The infants (n = 141) were randomized to be fed either CMF or EHF. Dietary intakes were determined from weighed bottle methods and/or prospective diet records, and body weights were measured on 14 occasions from 0.5 to 12.5 months. Secondary data analysis determined the glutamic acid content of the diet over time. The trial was registered at http://www. CLINICALTRIALS gov/ as NCT01700205, 3 October 2012. Glutamic acid intake from formula and other foods was significantly higher in infants fed EHF when compared to CMF. As glutamic acid intake from formula decreased, intake from other nutritional sources steadily increased from 5.5 months. Regardless of formula type, every infant exceeded the ADI of 30 mg/kg bw/day from 0.5 to 12.5 months. Conclusion: Given that the ADI recommendation was not based on actual intake data of primary energy sources during infancy, the present findings on the growing child's ingestion of glutamic acid from infant formula and the complementary diet may be of interest when developing future guidelines and communications to parents, clinical care providers, and policy makers. WHAT IS KNOWN • The 2017 re-evaluation of the safety of glutamic acid-glutamates and the recommended acceptable daily intake (ADI) of 30 mg/kg bw/d by the European Food Safety Authority (EFSA) did not include actual intake data of the primary energy sources during infancy. WHAT IS NEW • During the first year, glutamic acid intake from infant formula and other food sources exceeded the ADI of 30 mg/kg bw/day.
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Affiliation(s)
- Julie A Mennella
- Monell Chemical Senses Center, Philadelphia, PA, 19104-3308, USA.
| | | | - Michelle T Delahanty
- Department of Behavioral Health and Nutrition, University of Delaware, Newark, DE, 19173, USA
| | - Virginia A Stallings
- Children's Hospital of Philadelphia, Philadelphia, PA; Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, 19146, USA
| | - Jillian C Trabulsi
- Department of Behavioral Health and Nutrition, University of Delaware, Newark, DE, 19173, USA
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Torres-Guardado R, Rozès N, Esteve-Zarzoso B, Reguant C, Bordons A. Succinic acid production by wine yeasts and the influence of GABA and glutamic acid. Int Microbiol 2023:10.1007/s10123-023-00410-9. [PMID: 37498437 DOI: 10.1007/s10123-023-00410-9] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 06/29/2023] [Accepted: 07/21/2023] [Indexed: 07/28/2023]
Abstract
As a consequence of alcoholic fermentation (AF) in wine, several compounds are released by yeasts, and some of them are linked to the general quality and mouthfeel perceptions in wine. However, others, such as succinic acid, act as inhibitors, mainly of malolactic fermentation. Succinic acid is produced by non-Saccharomyces and Saccharomyces yeasts during the initial stages of AF, and the presence of some amino acids such as γ-aminobutyric acid (GABA) and glutamic acid can increase the concentration of succinic acid. However, the influence of these amino acids on succinic acid production has been studied very little to date. In this work, we studied the production of succinic acid by different strains of non-Saccharomyces and Saccharomyces yeasts during AF in synthetic must, and the influence of the addition of GABA or glutamic acid or a combination of both. The results showed that succinic acid can be produced by non-Saccharomyces yeasts with values in the range of 0.2-0.4 g/L. Moreover, the addition of GABA or glutamic acid can increase the concentration of succinic acid produced by some strains to almost 100 mg/L more than the control, while other strains produce less. Consequently, higher succinic acid production by non-Saccharomyces yeast in coinoculated fermentations with S. cerevisiae strains could represent a risk of inhibiting Oenococcus oeni and therefore the MLF.
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Affiliation(s)
- Rafael Torres-Guardado
- Grup de Biotecnologia Enològica, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, Facultat d'Enologia, C/ Marcel·lí Domingo 1, 43007, Tarragona, Catalonia, Spain
| | - Nicolás Rozès
- Grup de Biotecnologia Microbiana dels Aliments, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, Facultat d'Enologia, C/ Marcel·lí Domingo 1, 43007, Tarragona, Catalonia, Spain
| | - Braulio Esteve-Zarzoso
- Grup de Biotecnologia Enològica, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, Facultat d'Enologia, C/ Marcel·lí Domingo 1, 43007, Tarragona, Catalonia, Spain
| | - Cristina Reguant
- Grup de Biotecnologia Enològica, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, Facultat d'Enologia, C/ Marcel·lí Domingo 1, 43007, Tarragona, Catalonia, Spain
| | - Albert Bordons
- Grup de Biotecnologia Enològica, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, Facultat d'Enologia, C/ Marcel·lí Domingo 1, 43007, Tarragona, Catalonia, Spain.
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7
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Tang X, Wen J, Mu L, Gao Z, Weng J, Li X, Hu X. Regulation of arsenite toxicity in lettuce by pyrite and glutamic acid and the related mechanism. Sci Total Environ 2023; 877:162928. [PMID: 36934948 DOI: 10.1016/j.scitotenv.2023.162928] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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: 01/03/2023] [Revised: 03/10/2023] [Accepted: 03/13/2023] [Indexed: 05/06/2023]
Abstract
Compared with the effect of a single substance on arsenic plant toxicity, the effect of coexisting pyrite and natural organic matter can better reflect actual environmental conditions. In this study, the interaction between pyrite and glutamic acid in arsenite solution was explored, the influence of pyrite and glutamic acid on arsenite plant toxicity was evaluated, and the metabolic regulation mechanism of pyrite and glutamic acid on the arsenite phytotoxic effect was clarified by metabolomics analysis. Combined pyrite and glutamic acid treatment fixed more arsenic by forming chemical bonds such as AsS, AsO, and As-O-OH in culture solution and reduced inorganic arsenic levels in plants. Compared with glutamic acid alone and pyrite alone, the combined treatment reduced the inorganic arsenic concentration in plants by 4.7 % and 40.0 %, respectively. The combined treatment limited plant ROS accumulation and maintained the leaf chlorophyll content by increasing SOD synthesis. Compared with the effect of As(III) alone, the chlorophyll content increased by 15.1-21.0 % on average under the combined treatment. The combined treatment promoted the absorption of Ca, Cu, Fe, Mo and Zn in lettuce, enhanced plant adaptation to As(III) and significantly improved plant nutritional quality. Compared with glutamic acid alone, the combined treatment increased the VC, fiber and protein contents by 128.9 %, 202.8 % and 36.7 %, respectively. Metabolomics analysis indicated that in the combined treatment group, the upregulation of tyrosine, pyruvate and N metabolism increased the plant chlorophyll content. The upregulation of S metabolism increases VC synthesis in plants and inhibits ROS accumulation, thus maintaining normal plant growth and development. The upregulation of glutathione and glycine metabolism enhances plant stress resistance. This study will provide a new way to scientifically and rationally evaluate the ecological risk of arsenic and regulate its toxicity.
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Affiliation(s)
- Xin Tang
- Tianjin Key Laboratory of Agro-Environment and Safe-Product, Key Laboratory for Environmental Factors Control of Agro-Product Quality Safety (Ministry of Agriculture and Rural Affairs), Institute of Agro-Environmental Protection, Ministry of Agriculture and Rural Affairs, 300191, Tianjin, China
| | - Jingyu Wen
- Tianjin Key Laboratory of Agro-Environment and Safe-Product, Key Laboratory for Environmental Factors Control of Agro-Product Quality Safety (Ministry of Agriculture and Rural Affairs), Institute of Agro-Environmental Protection, Ministry of Agriculture and Rural Affairs, 300191, Tianjin, China
| | - Li Mu
- Tianjin Key Laboratory of Agro-Environment and Safe-Product, Key Laboratory for Environmental Factors Control of Agro-Product Quality Safety (Ministry of Agriculture and Rural Affairs), Institute of Agro-Environmental Protection, Ministry of Agriculture and Rural Affairs, 300191, Tianjin, China.
| | - Ziwei Gao
- Tianjin Key Laboratory of Agro-Environment and Safe-Product, Key Laboratory for Environmental Factors Control of Agro-Product Quality Safety (Ministry of Agriculture and Rural Affairs), Institute of Agro-Environmental Protection, Ministry of Agriculture and Rural Affairs, 300191, Tianjin, China
| | - Jingxian Weng
- Tianjin Key Laboratory of Agro-Environment and Safe-Product, Key Laboratory for Environmental Factors Control of Agro-Product Quality Safety (Ministry of Agriculture and Rural Affairs), Institute of Agro-Environmental Protection, Ministry of Agriculture and Rural Affairs, 300191, Tianjin, China
| | - Xiaokang Li
- School of Environmental and Material Engineering, Yantai University, Yantai 264005, China
| | - Xiangang Hu
- Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, 300350 Tianjin, China
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Zhang Z, Chen W, Tao L, Wei X, Gao L, Gao Y, Suo J, Yu W, Hu Y, Yang B, Jiang H, Farag MA, Wu J, Song L. Ethylene treatment promotes umami taste-active amino acids accumulation of Torreya grandis nuts post-harvest by comparative chemical and transcript analyses. Food Chem 2023; 408:135214. [PMID: 36565552 DOI: 10.1016/j.foodchem.2022.135214] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 11/26/2022] [Accepted: 12/11/2022] [Indexed: 12/15/2022]
Abstract
Amino acids play critical roles in physiological processes and also contribute significantly to fruit quality. In this study, the effect of exogenous ethylene on amino acids metabolism and related genes expression in Torreya grandis were investigated. The results revealed that ethylene treatment (3000 μL L-1 for 24 h) significantly increased amino acids level. Umami amino acids were distinctly upregulated in ethylene-treated versus control nuts, with glutamic and aspartic acids to demonstrate 1.9-fold and 2.1-fold increase. Transcriptome analysis revealed that deferentially expressed genes were mainly enriched in alanine aspartate and glutamate metabolism. RT-qPCR confirmed that ethylene treatment up-regulated expression of their biosynthesis genes (TgGOGAT1, TgAATC1, TgAATC4) concurrent with suppression of their degradation enzymes (TgGS2, TgGAD1, TgGAD3, TgASNS1). Ethylene treatment appears to promote umami taste-active amino acids and improve T. grandis nut quality post-harvest.
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Affiliation(s)
- Zuying Zhang
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China; Zhejiang Provincial Key Laboratory of Forest Aromatic Plants-based Healthcare Functions, Zhejiang A&F University, Lin'an, 311300, Zhejiang Province, People's Republic of China
| | - Wenchao Chen
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China
| | - Liu Tao
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China
| | - Xixing Wei
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China
| | - Lingling Gao
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China
| | - Yadi Gao
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China
| | - Jinwei Suo
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China
| | - Weiwu Yu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China
| | - Yuanyuan Hu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China
| | - Baoru Yang
- Food Chemistry and Food Development, Department of Life Technologies, University of Turku, FI-20014 Turku, Finland
| | - Huifeng Jiang
- Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, People's Republic of China
| | - Mohamed A Farag
- Pharmacognosy Department, College of Pharmacy, Cairo University, Kasr el Aini st., Cairo P.B. 11562, Egypt
| | - Jiasheng Wu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China.
| | - Lili Song
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an 311300, Zhejiang Province, People's Republic of China; Zhejiang Provincial Key Laboratory of Forest Aromatic Plants-based Healthcare Functions, Zhejiang A&F University, Lin'an, 311300, Zhejiang Province, People's Republic of China.
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Liu H, Zhou R, Yin L, Si N, Yang C, Huang C, Wang R, Chen X. β-asarone prolongs sleep via regulating the level of glutamate in the PVN. Biochem Biophys Res Commun 2023; 665:71-77. [PMID: 37149985 DOI: 10.1016/j.bbrc.2023.05.010] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 04/20/2023] [Accepted: 05/02/2023] [Indexed: 05/09/2023]
Abstract
People of all ages could suffer from sleep disorders, which are increasingly recognized as common manifestations of neurologic disease. Acorus tatarinowii is a herb that has been used in traditional medicine to promote sleep. β-asarone, as the main component of volatile oil obtained from Acorus tatarinowii, may be the main contributor to the sleeping-promoting efficacy of Acorus tatarinowii. In the study, adult male C57BL/6 mice were administered β-asarone at 12.5 mg/kg, 25 mg/kg, and 50 mg/kg. Behavioral experiments showed that β-asarone at 25 mg/kg could significantly improve sleep duration. It was also observed that the proportion of NREM (Non-Rapid Eye Movement) sleep increased considerably after administration of β-asarone. In the PVN (paraventricular nucleus of hypothalamus) region of the hypothalamus, it was observed that the glutamate content decreased after β-asarone treatment. At the same time, the expression of VGLUT2 (vesicular glutamate transporters 2) decreased while the expression of GAD65 (glutamic acid decarboxylase 65) and GABARAP (GABA Type A Receptor-Associated Protein) increased in the hypothalamus, suggesting that β-asarone may suppress arousal by reducing glutamate and promoting transformation of glutamate to the inhibitory neurotransmitter GABA (γ-aminobutyric acid). This study is the first to focus on the association between β-asarone and sleep, shedding perspectives for pharmacological applications of β-asarone and providing a new direction for future research.
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Affiliation(s)
- Haoyu Liu
- School of Pharmacy, Anhui Medical University, Hefei, 230032, China
| | - Ruiqing Zhou
- School of Food Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Lanxiang Yin
- School of Pharmacy, Anhui Medical University, Hefei, 230032, China
| | - Nana Si
- School of Pharmacy, Anhui Medical University, Hefei, 230032, China
| | - Chenglin Yang
- School of Pharmacy, Anhui Medical University, Hefei, 230032, China
| | - Chengqing Huang
- School of Food Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Rongrong Wang
- School of Food Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Xiangtao Chen
- School of Pharmacy, Anhui Medical University, Hefei, 230032, China.
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Huang Y, Yang C, Lv J, Zhang Y, Wang K, Ma L, Liu Z, Yu H, Li M, Tang Z. Formula optimization and in vivo study of poly(L- glutamic acid)-g-methoxy poly(ethylene glycol)/combretastatin A4/BLZ945 nanoparticles for cancer therapy. Int J Pharm 2023; 636:122849. [PMID: 36933582 DOI: 10.1016/j.ijpharm.2023.122849] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 02/18/2023] [Accepted: 03/11/2023] [Indexed: 03/18/2023]
Abstract
Poly(L-glutamic acid)-g-methoxy poly(ethylene glycol)/Combretastatin A4 (CA4)/BLZ945 nanoparticles (CB-NPs) have shown great potential in synergistic cancer therapy. However, it is still unclear how the nanoparticles' formula, such as injection dose, active agent ratio, and drug loading content, affects the side effects and in vivo efficacy of CB-NPs. In this study, a series of CB-NPs with different BLZ945/CA4 (B/C) ratios and drug loading contents were synthesized and evaluated on a hepatoma (H22) tumor-bearing mice model. The injection dose and B/C ratio were found to have a significant influence on the in vivo anticancer efficacy. The CB-NPs 20 with B/C weight ratio of 0.45/1, and total drug loading content (B + C) of 20.7 wt%, showed the highest potential for clinical application. Systematic pharmacokinetics, biodistribution, and in vivo efficacy evaluation for CB-NPs 20 have been finished, which may provide significant instruction for medicine screening and clinical application.
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Affiliation(s)
- Yue Huang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Chenguang Yang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Jianlin Lv
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Yu Zhang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Kun Wang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Lili Ma
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Zhilin Liu
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Haiyang Yu
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
| | - Mingqiang Li
- Laboratory of Biomaterials and Translational Medicine, Center for Nanomedicine, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou 510630, China
| | - Zhaohui Tang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
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11
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Qiu XM, Sun YY, Li ZG. Signaling molecule glutamic acid initiates the expression of genes related to methylglyoxal scavenging and osmoregulation systems in maize seedlings. Plant Signal Behav 2022; 17:1994257. [PMID: 34875972 PMCID: PMC8920167 DOI: 10.1080/15592324.2021.1994257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 09/28/2021] [Revised: 10/12/2021] [Accepted: 10/12/2021] [Indexed: 05/31/2023]
Abstract
Glutamic acid (Glu) is not only a protein amino acid, but also a signaling molecule, which takes part in various physiological processes in plants. Our previous study found that root-irrigation with Glu could improve the heat tolerance of maize seedlings by plant Glu receptor-like channels-mediated calcium signaling (Protoplasma, 2019; 256:1165-1169), but its molecular mechanism remains unclear. In this study, based on the our previous work, the maize seedlings were treated with 1 mM Glu prior to be exposed to heat stress (HS), and then the expression of genes related to related to methylglyoxal (MG)-scavenging and osmoregulation systems was quantified. The results showed that Glu treatment up-regulated the gene expression of Zea mays aldo-keto reductase (ZmAKR) under both non-HS and HS conditions. Also, the gene expression of Zea mays alkenal/alkenone reductase (ZmAAR), glyoxalase II (ZmGly II), pyrroline-5-carboxylate synthase (ZmP5CS), betaine dehydrogenase (ZmBADH), and trehalase (ZmTRE) was up-regualted by exogenous Glu treatment under HS conditions. These data imply that signaling molecule Glu initiated the expression of genes related to MG-scavenging and osmoregulation systems in maize seedlings, further supporting the fact that Glu-enhanced heat tolerance in plants.
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Affiliation(s)
- Xue-Mei Qiu
- School of Life Sciences, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Key Laboratory of Biomass Energy and Environmental Biotechnology, Yunnan Normal University, Kunming, Yunnan, P.R. China
| | - Yu-Ying Sun
- School of Life Sciences, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Key Laboratory of Biomass Energy and Environmental Biotechnology, Yunnan Normal University, Kunming, Yunnan, P.R. China
| | - Zhong-Guang Li
- School of Life Sciences, Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Key Laboratory of Biomass Energy and Environmental Biotechnology, Yunnan Normal University, Kunming, Yunnan, P.R. China
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12
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Qiu XM, Sun YY, Wang JQ, Xiang RH, Li ZG. Involvement of osmoregulation, glyoxalase, and non-glyoxalase systems in signaling molecule glutamic acid-boosted thermotolerance in maize seedlings. Protoplasma 2022; 259:1507-1520. [PMID: 35277781 DOI: 10.1007/s00709-022-01753-2] [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: 12/08/2021] [Accepted: 03/04/2022] [Indexed: 06/14/2023]
Abstract
Glutamic acid (Glu) is not only an important protein building block, but also a signaling molecule in plants. However, the Glu-boosted thermotolerance and its underlying mechanisms in plants still remain unclear. In this study, the maize seedlings were irrigated with Glu solution prior to exposure to heat stress (HS), the seedlings' thermotolerance as well as osmoregulation, glyoxalase, and non-glyoxalase systems were evaluated. The results manifested that the seedling survival and tissue vitality after HS were boosted by Glu, while membrane damage was reduced in comparison with the control seedlings without Glu treatment, indicating Glu boosted the thermotolerance of maize seedlings. Additionally, root-irrigation with Glu increased its endogenous level, reinforced osmoregulation system (i.e., an increase in the levels of proline, glycine betaine, trehalose, and total soluble sugar, as well as the activities of pyrroline-5-carboxylate synthase, betaine dehydrogenase, and trehalose-5-phosphate phosphatase) in maize seedlings under non-HS and HS conditions compared with the control. Also, Glu treatment heightened endogenous methylglyoxal level and the activities of glyoxalase system (glyoxalase I, glyoxalase II, and glyoxalase III) and non-glyoxalase system (methylglyoxal reductase, lactate dehydrogenase, aldo-ketoreductase, and alkenal/alkenone reductase) in maize seedlings under non-HS and HS conditions as compared to the control. These data hint that osmoregulation, glyoxalase, and non-glyoxalase systems are involved in signaling molecule Glu-boosted thermotolerance of maize seedlings.
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Affiliation(s)
- Xue-Mei Qiu
- School of Life Sciences, Yunnan Normal University, Kunming, 650092, People's Republic of China
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Kunming, 650092, People's Republic of China
- Key Laboratory of Biomass Energy and Environmental Biotechnology, Yunnan Normal University, Yunnan Province, Kunming, 650092, People's Republic of China
| | - Yu-Ying Sun
- School of Life Sciences, Yunnan Normal University, Kunming, 650092, People's Republic of China
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Kunming, 650092, People's Republic of China
- Key Laboratory of Biomass Energy and Environmental Biotechnology, Yunnan Normal University, Yunnan Province, Kunming, 650092, People's Republic of China
| | - Jia-Qi Wang
- School of Life Sciences, Yunnan Normal University, Kunming, 650092, People's Republic of China
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Kunming, 650092, People's Republic of China
- Key Laboratory of Biomass Energy and Environmental Biotechnology, Yunnan Normal University, Yunnan Province, Kunming, 650092, People's Republic of China
| | - Ru-Hua Xiang
- School of Life Sciences, Yunnan Normal University, Kunming, 650092, People's Republic of China
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Kunming, 650092, People's Republic of China
- Key Laboratory of Biomass Energy and Environmental Biotechnology, Yunnan Normal University, Yunnan Province, Kunming, 650092, People's Republic of China
| | - Zhong-Guang Li
- School of Life Sciences, Yunnan Normal University, Kunming, 650092, People's Republic of China.
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Kunming, 650092, People's Republic of China.
- Key Laboratory of Biomass Energy and Environmental Biotechnology, Yunnan Normal University, Yunnan Province, Kunming, 650092, People's Republic of China.
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13
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Yang KC, Chen YY, Liu MN, Yang BH, Chou YH. Interactions between dopamine transporter and N-methyl-d-aspartate receptor-related amino acids on cognitive impairments in schizophrenia. Schizophr Res 2022; 248:263-270. [PMID: 36115191 DOI: 10.1016/j.schres.2022.09.022] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 07/21/2022] [Accepted: 09/07/2022] [Indexed: 11/18/2022]
Abstract
BACKGROUND Cognitive impairments, the main determinants of functional outcomes in schizophrenia, had limited treatment responses and need a better understanding of the mechanisms. Dysfunctions of the dopamine system and N-methyl-d-aspartate receptor (NMDAR), the primary pathophysiologies of schizophrenia, may impair cognition. This study explored the effects and interactions of striatal dopamine transporter (DAT) and plasma NMDAR-related amino acids on cognitive impairments in schizophrenia. METHODS We recruited 36 schizophrenia patients and 36 age- and sex-matched healthy controls (HC). All participants underwent cognitive assessments of attention, memory, and executive function. Single-photon emission computed tomography with 99mTc-TRODAT and ultra-performance liquid chromatography were applied to determine DAT availability and plasma concentrations of eight amino acids, respectively. RESULTS Compared with HC, schizophrenia patients had lower cognitive performance, higher methionine concentrations, decreased concentrations of glutamic acid, cysteine, aspartic acid, arginine, the ratio of glutamic acid to gamma-aminobutyric acid (Glu/GABA), and DAT availability in the left caudate nucleus (CN) and putamen. Regarding memory scores, Glu/GABA and the DAT availability in left CN and putamen exhibited positive relationships, while methionine concentrations showed negative associations in all participants. The DAT availability in left CN mediated the methionine-memory relationship. An exploratory backward stepwise regression analysis for the four biological markers associated with memory indicated that DAT availability in left CN and Glu/GABA remained in the final model. CONCLUSIONS This study demonstrated the interactions of striatal DAT and NMDAR-related amino acids on cognitive impairments in schizophrenia. Future studies to comprehensively evaluate their complex interactions and treatment implications are warranted.
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Affiliation(s)
- Kai-Chun Yang
- Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Psychiatry, Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Yen-Yu Chen
- Department of Education and Research, Taipei City Hospital, Taipei, Taiwan
| | - Mu-N Liu
- Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Psychiatry, Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Bang-Hung Yang
- Department of Nuclear Medicine, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Biomedical Imaging and Radiological Sciences, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Yuan-Hwa Chou
- Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Psychiatry, Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Center for Quality Management, Taipei Veterans General Hospital, Taipei, Taiwan.
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14
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El Tabbal J. Monosodium glutamate in a type 2 diabetes context: A large scoping review. Regul Toxicol Pharmacol 2022; 133:105223. [PMID: 35817208 DOI: 10.1016/j.yrtph.2022.105223] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 05/16/2022] [Accepted: 07/06/2022] [Indexed: 11/30/2022]
Abstract
This scoping review aimed to map and elaborate the heterogenous and inconclusive body of evidence relating monosodium glutamate (MSG) and type 2 diabetes (T2DM). For this reason, multiple health outcomes related to T2DM were included and a systematic search was conducted. Experimental and observational trials between 1995 and January 2021 were collected. The tests were highly heterogenous in their samples, doses, route of exposures, durations, diets and conclusions. There was a pattern of negative effects of MSG at oral doses ≥2,000 mg/kg of body weight, and by gavage or injection at any given dose. Evidence was lacking in many areas and most of the evidence relied on short term tests. Further research should focus on standardizing and justifying methodologies, conducting long term studies and toxicokinetic tests, and avoiding bias. Focusing on the gaps highlighted and investigating mechanisms of action of MSG is crucial. Evidence-based toxicology is encouraged.
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Affiliation(s)
- Jana El Tabbal
- Department of Health Sciences, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom.
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15
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Mizoguchi T, Fujimori H, Ohba T, Shimazawa M, Nakamura S, Shinohara M, Hara H. Glutamatergic dysfunction is associated with phenotypes of VGF-overexpressing mice. Exp Brain Res 2022; 240:2051-2060. [PMID: 35587282 DOI: 10.1007/s00221-022-06384-w] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 05/04/2022] [Indexed: 11/04/2022]
Abstract
VGF nerve growth factor inducible (VGF) is a neuropeptide precursor, which is induced by several neurotrophic factors, including nerve growth factor and brain-derived neurotrophic factor. Clinically, an upregulation of VGF levels has been reported in the cerebrospinal fluid and prefrontal cortex of patients with schizophrenia. In our previous study, mice overexpressing VGF exhibited schizophrenia-related behaviors. In the current study, we characterized the biochemical changes in the brains of VGF-overexpressing mice. Metabolomics analysis of neurotransmitters revealed that glutamic acid and N-acetyl-L-aspartic acid were increased in the striatum of VGF-overexpressing mice. Additionally, the present study revealed that MK-801, which causes the disturbance in glutamic acid metabolism, increased the expression level of VGF-derived peptide (NAPP129, named VGF20), and VGF-overexpressing mice had higher sensitivity to MK-801. These results suggest that VGF may modulate the regulation of glutamic acid levels and the degree of glutamic acid signaling.
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Affiliation(s)
- Takahiro Mizoguchi
- Molecular Pharmacology, Department of Biofunctional Evaluation, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan
| | - Honoka Fujimori
- Molecular Pharmacology, Department of Biofunctional Evaluation, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan
| | - Takuya Ohba
- Molecular Pharmacology, Department of Biofunctional Evaluation, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan
| | - Masamitsu Shimazawa
- Molecular Pharmacology, Department of Biofunctional Evaluation, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan.
| | - Shinsuke Nakamura
- Molecular Pharmacology, Department of Biofunctional Evaluation, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan
| | - Masakazu Shinohara
- The Integrated Center for Mass Spectrometry, Kobe University Graduate School of Medicine, Kobe, Japan.,Division of Epidemiology, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Hideaki Hara
- Molecular Pharmacology, Department of Biofunctional Evaluation, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu, 501-1196, Japan
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16
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Asgher M, Sehar Z, Rehaman A, Rashid S, Ahmed S, Per TS, Alyemeni MN, Khan NA. Exogenously-applied L- glutamic acid protects photosynthetic functions and enhances arsenic tolerance through increased nitrogen assimilation and antioxidant capacity in rice (Oryza sativa L.). Environ Pollut 2022; 301:119008. [PMID: 35189299 DOI: 10.1016/j.envpol.2022.119008] [Citation(s) in RCA: 4] [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: 07/30/2021] [Revised: 01/22/2022] [Accepted: 02/14/2022] [Indexed: 05/25/2023]
Abstract
L-Glutamic acid (Glu) is used as an effective bio-stimulant to reduce arsenic (As) stress in plants. The role of Glu was studied in the protection of photosynthesis and growth of rice (Oryza sativa L. Japonica Type Taipie-309) plants grown with 50 μM As stress by studying the oxidative stress, photosynthetic and growth characteristics. Among the Glu concentrations (0, 2.5, 5 and 10 μM), 10 μM Glu maximally enhanced photosynthesis and growth parameters with the least cellular oxidative stress level. The supplementation of 10 μM Glu resulted in the reduced effects of As stress on gas exchange parameters, PSII activity and growth attributes through enhancement of antioxidant and proline metabolism. The enzymes of nitrogen (N) assimilation, such as nitrate reductase, nitrite reductase, glutamine synthetase and glutamate synthase were increased with Glu treatment under As stress. The Glu-induced metabolite synthesis showed the role of various metabolites in As stress responses. The role of Glu as a signalling molecule in reducing the adverse effects of As through accelerating the antioxidant enzymes, PSII activity, proline metabolism and nitrogen assimilation has been discussed.
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Affiliation(s)
- Mohd Asgher
- Plant Physiology and Biochemistry Laboratory, Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, Jammu and Kashmir, 185234, India
| | - Zebus Sehar
- Plant Physiology and Biochemistry Laboratory, Department of Botany, Aligarh Muslim University, Aligarh, 202002, India
| | - Abdul Rehaman
- Plant Physiology and Biochemistry Laboratory, Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, Jammu and Kashmir, 185234, India
| | - Shaista Rashid
- Plant Physiology and Biochemistry Laboratory, Department of Botany, School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, Jammu and Kashmir, 185234, India
| | - Sajad Ahmed
- Plant Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu, Jammu and Kashmir, 180001, India
| | - Tasir S Per
- Department of Botany, Government Degree College, Doda, Jammu and Kashmir, 182202, India
| | - Mohammed Nasser Alyemeni
- Department of Botany and Microbiology, College of Sciences, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Nafees A Khan
- Plant Physiology and Biochemistry Laboratory, Department of Botany, Aligarh Muslim University, Aligarh, 202002, India.
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17
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Kim DR, Jeon CW, Cho G, Thomashow LS, Weller DM, Paik MJ, Lee YB, Kwak YS. Glutamic acid reshapes the plant microbiota to protect plants against pathogens. Microbiome 2021; 9:244. [PMID: 34930485 PMCID: PMC8691028 DOI: 10.1186/s40168-021-01186-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [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: 09/12/2021] [Accepted: 10/27/2021] [Indexed: 05/26/2023]
Abstract
BACKGROUND Plants in nature interact with other species, among which are mutualistic microorganisms that affect plant health. The co-existence of microbial symbionts with the host contributes to host fitness in a natural context. In turn, the composition of the plant microbiota responds to the environment and the state of the host, raising the possibility that it can be engineered to benefit the plant. However, technology for engineering the structure of the plant microbiome is not yet available. RESULTS The loss of diversity and reduction in population density of Streptomyces globisporus SP6C4, a core microbe, was observed coincident with the aging of strawberry plants. Here, we show that glutamic acid reshapes the plant microbial community and enriches populations of Streptomyces, a functional core microbe in the strawberry anthosphere. Similarly, in the tomato rhizosphere, treatment with glutamic acid increased the population sizes of Streptomyces as well as those of Bacillaceae and Burkholderiaceae. At the same time, diseases caused by species of Botrytis and Fusarium were significantly reduced in both habitats. We suggest that glutamic acid directly modulates the composition of the microbiome community. CONCLUSIONS Much is known about the structure of plant-associated microbial communities, but less is understood about how the community composition and complexity are controlled. Our results demonstrate that the intrinsic level of glutamic acid in planta is associated with the composition of the microbiota, which can be modulated by an external supply of a biostimulant. Video Abstract.
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Affiliation(s)
- Da-Ran Kim
- RILS, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Chang-Wook Jeon
- Division of Applied Life Science (BK 21 plus) and IALS, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Gyeongjun Cho
- Division of Applied Life Science (BK 21 plus) and IALS, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Linda S Thomashow
- US Department of Agriculture, Agricultural Research Service, Wheat Health, Genetics and Quality Research Unit, Pullman, WA, 99164-6430, USA
| | - David M Weller
- US Department of Agriculture, Agricultural Research Service, Wheat Health, Genetics and Quality Research Unit, Pullman, WA, 99164-6430, USA
| | - Man-Jeong Paik
- College of Pharmacy, Sunchon National University, Suncheon, 65980, Republic of Korea
| | - Yong Bok Lee
- Division of Applied Life Science (BK 21 plus) and IALS, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Youn-Sig Kwak
- RILS, Gyeongsang National University, Jinju, 52828, Republic of Korea.
- Division of Applied Life Science (BK 21 plus) and IALS, Gyeongsang National University, Jinju, 52828, Republic of Korea.
- Department of Plant Medicine, Gyeongsang National University, Jinju, 52828, Republic of Korea.
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18
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Wu C, Barkova D, Komarova N, Offenhäusser A, Andrianova M, Hu Z, Kuznetsov A, Mayer D. Highly selective and sensitive detection of glutamate by an electrochemical aptasensor. Anal Bioanal Chem 2021; 414:1609-1622. [PMID: 34783880 DOI: 10.1007/s00216-021-03783-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 10/21/2021] [Accepted: 11/09/2021] [Indexed: 01/03/2023]
Abstract
An electrochemical aptamer-based sensor was developed for glutamate, the major excitatory neurotransmitter in the central nervous system. Determining glutamic acid release and glutamic acid levels is crucial for studying signal transmission and for diagnosing pathological conditions in the brain. Glutamic acid-selective oligonucleotides were isolated from an ssDNA library using the Capture-SELEX protocol in complex medium. The selection permitted the isolation of an aptamer 1d04 with a dissociation constant of 12 µM. The aptamer sequence was further used in the development of an electrochemical aptamer sensor. For this purpose, a truncated aptamer sequence named glu1 was labelled with a ferrocene redox tag at the 3'-end and immobilized on a gold electrode surface via Au-thiol bonds. Using 6-mercapto-1-hexanol as the backfill, the sensor performance was characterized by alternating current voltammetry. The glu1 aptasensor showed a limit of detection of 0.0013 pM, a wide detection range between 0.01 pM and 1 nM, and good selectivity for glutamate in tenfold diluted human serum. With this enzyme-free aptasensor, the highly selective and sensitive detection of glutamate was demonstrated, which possesses great potential for implementation in microelectrodes and for in vitro as well as in vivo monitoring of neurotransmitter release.
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Affiliation(s)
- Changtong Wu
- Institute of Biological Information Processing, (IBI-3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany.,Faculty I, RWTH Aachen University, 52062, Aachen, Germany
| | - Daria Barkova
- Scientific-Manufacturing Complex Technological Centre, 1-7 Shokin Square, Zelenograd, Moscow, 124498, Russia
| | - Natalia Komarova
- Scientific-Manufacturing Complex Technological Centre, 1-7 Shokin Square, Zelenograd, Moscow, 124498, Russia
| | - Andreas Offenhäusser
- Institute of Biological Information Processing, (IBI-3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany.,Faculty I, RWTH Aachen University, 52062, Aachen, Germany
| | - Mariia Andrianova
- Scientific-Manufacturing Complex Technological Centre, 1-7 Shokin Square, Zelenograd, Moscow, 124498, Russia
| | - Ziheng Hu
- Institute of Biological Information Processing, (IBI-3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany
| | - Alexander Kuznetsov
- Scientific-Manufacturing Complex Technological Centre, 1-7 Shokin Square, Zelenograd, Moscow, 124498, Russia.
| | - Dirk Mayer
- Institute of Biological Information Processing, (IBI-3), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany.
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19
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Smucny J, Carter CS, Maddock RJ. Medial Prefrontal Cortex Glutamate Is Reduced in Schizophrenia and Moderated by Measurement Quality: A Meta-analysis of Proton Magnetic Resonance Spectroscopy Studies. Biol Psychiatry 2021; 90:643-651. [PMID: 34344534 PMCID: PMC9303057 DOI: 10.1016/j.biopsych.2021.06.008] [Citation(s) in RCA: 13] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 06/01/2021] [Accepted: 06/06/2021] [Indexed: 02/08/2023]
Abstract
BACKGROUND Magnetic resonance spectroscopy studies measuring brain glutamate separately from glutamine are helping elucidate schizophrenia pathophysiology. An expanded literature and improved methodologies motivate an updated meta-analysis examining effects of measurement quality and other moderating factors in characterizing abnormal glutamate levels in schizophrenia. METHODS Searching previous meta-analyses and the MEDLINE database identified 83 proton magnetic resonance spectroscopy datasets published through March 25, 2020. Three quality metrics were extracted-Cramér-Rao lower bound (CRLB), line width, and coefficient of variation. Pooled effect sizes (Hedges' g) were calculated with random-effects, inverse variance-weighted models. Moderator analyses were conducted using quality metrics, field strength, echo time, medication, age, and stage of illness. RESULTS Across 36 datasets (2086 participants), medial prefrontal cortex glutamate was significantly reduced in patients (g = -0.19, confidence interval [CI] = -0.07 to -0.32). CRLB and coefficient of variation quality subgroups significantly moderated this effect. Glutamate was significantly more reduced in studies with lower CRLB or coefficient of variation (g = -0.44, CI = -0.29 to -0.60, and g = -0.43, CI = -0.29 to -0.57, respectively). Studies using echo time ≤20 ms also showed significantly greater reduction in glutamate (g = -0.41, CI = -0.26 to -0.55). Across 11 hippocampal datasets, group differences and moderator effects were nonsignificant. Group effects in thalamus and dorsolateral prefrontal cortex were also nonsignificant. CONCLUSIONS High-quality measurements reveal consistently reduced medial prefrontal cortex glutamate in schizophrenia. Stricter CRLB criteria and reduced nuisance variance may increase the sensitivity of future studies examining additional regions and the pathophysiological significance of abnormal glutamate levels in schizophrenia.
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Affiliation(s)
- Jason Smucny
- Department of Psychiatry and Behavioral Sciences, University of California Davis, Davis, California
| | - Cameron S Carter
- Department of Psychiatry and Behavioral Sciences, University of California Davis, Davis, California
| | - Richard J Maddock
- Department of Psychiatry and Behavioral Sciences, University of California Davis, Davis, California.
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Andersen JV, Markussen KH, Jakobsen E, Schousboe A, Waagepetersen HS, Rosenberg PA, Aldana BI. Glutamate metabolism and recycling at the excitatory synapse in health and neurodegeneration. Neuropharmacology 2021; 196:108719. [PMID: 34273389 DOI: 10.1016/j.neuropharm.2021.108719] [Citation(s) in RCA: 119] [Impact Index Per Article: 39.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 07/01/2021] [Accepted: 07/13/2021] [Indexed: 02/08/2023]
Abstract
Glutamate is the primary excitatory neurotransmitter of the brain. Cellular homeostasis of glutamate is of paramount importance for normal brain function and relies on an intricate metabolic collaboration between neurons and astrocytes. Glutamate is extensively recycled between neurons and astrocytes in a process known as the glutamate-glutamine cycle. The recycling of glutamate is closely linked to brain energy metabolism and is essential to sustain glutamatergic neurotransmission. However, a considerable amount of glutamate is also metabolized and serves as a metabolic hub connecting glucose and amino acid metabolism in both neurons and astrocytes. Disruptions in glutamate clearance, leading to neuronal overstimulation and excitotoxicity, have been implicated in several neurodegenerative diseases. Furthermore, the link between brain energy homeostasis and glutamate metabolism is gaining attention in several neurological conditions. In this review, we provide an overview of the dynamics of synaptic glutamate homeostasis and the underlying metabolic processes with a cellular focus on neurons and astrocytes. In particular, we review the recently discovered role of neuronal glutamate uptake in synaptic glutamate homeostasis and discuss current advances in cellular glutamate metabolism in the context of Alzheimer's disease and Huntington's disease. Understanding the intricate regulation of glutamate-dependent metabolic processes at the synapse will not only increase our insight into the metabolic mechanisms of glutamate homeostasis, but may reveal new metabolic targets to ameliorate neurodegeneration.
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Affiliation(s)
- Jens V Andersen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark.
| | - Kia H Markussen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark; Department of Molecular and Cellular Biochemistry, College of Medicine, University of Kentucky, Lexington, KY, USA
| | - Emil Jakobsen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Arne Schousboe
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Helle S Waagepetersen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Paul A Rosenberg
- Department of Neurology and the F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, MA, USA; Program in Neuroscience, Harvard Medical School, Boston, MA, USA
| | - Blanca I Aldana
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark.
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Fahimitabar A, Razavian SMH, Rezaei SA. Application of RSM for optimization of glutamic acid production by Corynebacterium glutamicum in bath culture. Heliyon 2021; 7:e07359. [PMID: 34222694 PMCID: PMC8243512 DOI: 10.1016/j.heliyon.2021.e07359] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 04/14/2021] [Accepted: 06/16/2021] [Indexed: 11/26/2022] Open
Abstract
Glutamate plays an important role in different cellular processes. Its new applications in various industries have led to an increase in the production of it while fermentation is a very important economically method. In this study, the production of glutamate by the wild type of Corynebacterium glutamicum PTCC(Persian Type Culture Collection) 1532 was optimized using RSM. Central Composite Design (CCD) was developed by Design-Expert software version 12.0.3.0 (dx-12, State-Ease Inc.) to evaluate the effect of four important variables in five levels on glutamate production. TLC was employed to evaluate glutamate in medium qualitatively and then quantitative estimation was done by HPLC. Normal probability analysis demonstrated that data has a normal distribution. The results of ANOVA analysis showed that the urea concentration both alone and with temperature is the most effective variable in the fermentation process. Based on the quadratic model obtained in CCD, temperature 30 °C; glucose 9 g.dL-1; biotin 9 μg.L-1 and urea concentration of 0.3 g.dL-1 were found optimum conditions with a predicted glutamate production of 19.84 mg.mL-1 with desirable level 1. Therefore RSM can be an effective method to optimize glutamate production and the findings of this study are a guideline for the other amino acids fermentation by C. glutamicum.
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Affiliation(s)
- Azadeh Fahimitabar
- Department of Microbiology, Qom Branch, Islamic Azad University, Qom, Iran
| | | | - Seyyed Ali Rezaei
- Department of Microbiology, Qom Branch, Islamic Azad University, Qom, Iran
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22
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Liu J, Zhao G, Niu Y, Gan T, Yan Z, Zhang Y. Effect of electro-acupuncture therapy on limb spasm and excitability of motor neurons in stroke rats. Zhejiang Da Xue Xue Bao Yi Xue Ban 2021; 50:361-368. [PMID: 34402251 DOI: 10.3724/zdxbyxb-2021-0007] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
To investigate the effect of electro-acupuncture therapy on limb spasm and excitability of motor neurons in stroke rats. Ischemic stroke model was induced with middle cerebral artery embolization in SD rats. Thirty-three modeled rats were randomly divided into model group, electro-acupuncture group, and baclofen group with 11 rats in each group, and another 10 rats were taken as sham operation group. The electro-acupuncture group and the baclofen group were treated with electro-acupuncture and baclofen tablets respectively. The model group and the sham operation group had no intervention. The neural function was evaluated with Bederson's scale and balance beam test; the muscle tension was measured with electrophysiography; the pathological changes of brain tissue was examined with HE staining; the content of glutamic acid (Glu) and γ-aminobutyric acid (GABA) in rat cerebral cortex was analyze with enzyme linked immunosorbent assay (ELISA) method, the expression of metabotropic glutamate receptor 1a () and γ-aminobutyric acid type B receptor subunit 1 () mRNA were detected with RT-qPCR. Compared with the model group, the neurological function scores of the electro-acupuncture group and the baclofen group showed a downward trend at d7 after operation (all >0.05), and the neurological function scores of the electro-acupuncture group and the baclofen group were significantly decreased at d12 after the operation (all <0.05). Compared with sham operation group, the electrophysiological results of model group, electro-acupuncture group and baclofen group were significantly lower (all <0.05), and there was no statistical difference in the electrophysiological results of the model group, electro-acupuncture group and baclofen group at d7 after operation (all >0.05). Compared with the model group, the electrophysiological results of the electro-acupuncture group and baclofen group were significantly increased after operation (all <0.05). The results of HE staining showed that there was no cell edema and degeneration in the sham operation group, no pyknosis of the nucleus, and no bleeding in the interstitium. Cell edema and degeneration and mesenchymal congestion appeared in the model group. Compared with the model group, the cytoplasmic edema and degeneration and the interstitial bleeding in the electroacupuncture group and the baclofen group were reduced. Compared with sham operation group, the Glu content and the relative expression of mRNA was increased in the model group, electro-acupuncture group and baclofen group, while the GABA content and the relative expression of mRNA decreased (all <0.05). Compared with model group, the Glu content and the relative expression of mRNA in the electro-acupuncture group and baclofen group decreased, and the GABA content and relative expression of mRNA increased (all <0.05). Electro-acupuncture may improve limb spasm after stroke through regulating the expression of Glu and GABA in the cerebral cortex and the excitability of motor neurons in rats.
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Affiliation(s)
- Junxia Liu
- Rehabilitation of Traditional Chinese Medicine
| | - Guigui Zhao
- Rehabilitation of Traditional Chinese Medicine
| | - Yan Niu
- Rehabilitation of Traditional Chinese Medicine
| | - Ting Gan
- Rehabilitation of Traditional Chinese Medicine
| | - Zhenyu Yan
- Rehabilitation of Traditional Chinese Medicine
| | - Yasu Zhang
- Rehabilitation of Traditional Chinese Medicine
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Pagonabarraga J, Tinazzi M, Caccia C, Jost WH. The role of glutamatergic neurotransmission in the motor and non-motor symptoms in Parkinson's disease: Clinical cases and a review of the literature. J Clin Neurosci 2021; 90:178-183. [PMID: 34275546 DOI: 10.1016/j.jocn.2021.05.056] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 05/24/2021] [Accepted: 05/26/2021] [Indexed: 12/12/2022]
Abstract
Glutamate is the major excitatory neurotransmitter in the central nervous system and, as such, many brain regions, including the basal ganglia, are rich in glutamatergic neurons. The importance of the basal ganglia in the control of voluntary movement has long been recognised, with the effect of dysfunction of the region exemplified by the motor symptoms seen in Parkinson's disease (PD). However, the basal ganglia and the associated glutamatergic system also play a role in the modulation of emotion, nociception and cognition, dysregulation of which result in some of the non-motor symptoms of PD (depression/anxiety, pain and cognitive deficits). Thus, while the treatment of PD has traditionally been approached from the perspective of dopaminergic replacement, using agents such as levodopa and dopamine receptor agonists, the glutamatergic system offers a novel treatment target for the disease. Safinamide has been approved in over 20 countries globally for fluctuating PD as add-on therapy to levodopa regimens for the management of 'off' episodes. The drug has both dopaminergic and non-dopaminergic pharmacological effects, the latter including inhibition of abnormal glutamate release. The effect of safinamide on the glutamatergic system might present some advantages over dopamine-based therapies for PD by providing efficacy for motor (levodopa-induced dyskinesia) as well as non-motor (anxiety, mood disorders, pain) symptoms. In this article, we discuss the potential role of glutamatergic inhibition on these symptoms, using illustrative real-world examples of patients we have treated with safinamide.
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Affiliation(s)
- Javier Pagonabarraga
- Movement Disorders Unit, Neurology Department, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.
| | - Michele Tinazzi
- Neurology Unit, Department of Neuroscience, Biomedicine and Movement, University of Verona, Verona, Italy.
| | - Carla Caccia
- CNS Preclinical Pharmacology, Independent Advisor, Milan, Italy.
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Samiei L, Davoudi Pahnehkolayi M, Tehranifar A, Karimian Z. Organic and inorganic elicitors enhance in vitro regeneration of Rosa canina. J Genet Eng Biotechnol 2021; 19:60. [PMID: 33942185 PMCID: PMC8093148 DOI: 10.1186/s43141-021-00166-7] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 04/14/2021] [Indexed: 01/01/2023]
Abstract
Background Rosa canina is one of the most popular rose species which is widely used as the rootstock for the propagation of rose cultivars. The purpose of the present study is to improve the in vitro propagation efficiency of this valuable plant species using various growth stimulants in a proliferation medium. In this study, in vitro-derived axillary buds of R. canina were inoculated in Vander Salm (VS) medium supplemented with varying levels of organic or inorganic elicitors including casein hydrolysate (200, 400, and 600 mg/l), glutamic acid (2, 4, 8, and 12 mg/l), proline (500, 1000, 1500, and 2000 mg/l), and silver nitrate (25, 50, 75, and 100 mg/l), separately. Benzyl amino purine (BAP) as well as naphthalin acetic acid (NAA) were added to all media at a constant rate to promote shoot proliferation. Results The results indicated that the supplementation of casein hydrolysate to the VS medium markedly stimulated shoot regeneration by 173% in comparison to control. Shoot proliferation was also positively influenced by glutamic acid at all levels, however, at a lesser extent compared to casein hydrolysate. Silver nitrate at 100 mg/l induced the longest shoots (2.52 ± 0.248 cm) and maximum leaf number (8.90 ± 0.276) among all treatments. Although it did not encourage efficient shoot regeneration, the highest quality shoots with maximum growth vigor were observed in this treatment. Conclusion In this study, the promising role of casein hydrolysate in combination with plant growth regulators has been emphasized for the improved efficiency of R. canina regeneration protocol. Moreover, the addition of silver nitrate to the culture medium seems vital for enhancing the quality of regenerated shoots. The results of this study could be beneficial either for the further pharmaceutical or biochemical investigations of R. canina or commercial purposes for mass propagation of this specimen.
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Affiliation(s)
- Leila Samiei
- Research Center for Plant Sciences, Ferdowsi University of Mashhad, Mashhad, 91779948974, Iran.
| | - Mahboubeh Davoudi Pahnehkolayi
- Department of Horticultural Science and Landscape, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, 91779948974, Iran
| | - Ali Tehranifar
- Department of Horticultural Science and Landscape, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, 91779948974, Iran
| | - Zahra Karimian
- Research Center for Plant Sciences, Ferdowsi University of Mashhad, Mashhad, 91779948974, Iran
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Franzoni G, Cocetta G, Ferrante A. Effect of glutamic acid foliar applications on lettuce under water stress. Physiol Mol Biol Plants 2021; 27:1059-1072. [PMID: 34103849 PMCID: PMC8140180 DOI: 10.1007/s12298-021-00984-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 03/16/2021] [Accepted: 03/30/2021] [Indexed: 05/14/2023]
Abstract
The yield and quality of leafy vegetables can be compromised by reduced water availability. Glutamic acid is involved in different biological processes and among them it plays an important role in chlorophyll and proline biosynthesis. The aim of this work was to evaluate the possible efficacy of glutamic acid in counteracting water stress in romaine lettuce. Lettuce plants were grown in pots filled with substrate and subjected to water deprivation. A glutamic acid solution (1.9 mM) was applied as foliar treatment, both in stressed and non-stressed plants. The effect of the treatment was evaluated at different time points during the experiment in order to evaluate changes at a molecular, physiological, biochemical and agronomic level. Yield was reduced by 35% in stressed plants, while no significant changes in quality parameters were observed, except for nitrate content, which increased under water stress. At a molecular level, the expression of genes encoding for ROS scavenging enzymes was monitored but, apparently, glutamic acid did not significantly prevent the water stress response. Slightly positive effects deriving from glutamic acid application were found for nitrate and proline contents, suggesting that a possible mode of action of glutamic acid would involve a role for these molecules. Further studies are required, also on other crop species, for confirming these results. Different concentrations and application modes should be also tested.
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Affiliation(s)
- Giulia Franzoni
- Facoltà di Scienze Agrarie e Alimentari, Università degli Studi di Milano, Via Giovanni Celoria, 2, Milan, 20133 Italy
| | - Giacomo Cocetta
- Facoltà di Scienze Agrarie e Alimentari, Università degli Studi di Milano, Via Giovanni Celoria, 2, Milan, 20133 Italy
| | - Antonio Ferrante
- Facoltà di Scienze Agrarie e Alimentari, Università degli Studi di Milano, Via Giovanni Celoria, 2, Milan, 20133 Italy
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Abstract
In recent years, synthetic and semi-synthetic polymer materials have been widely used in various applications. Especially concerning biomedical applications, their biocompatibility, biodegradability, and non-toxicity have increased the interest of researchers to discover and develop new products for the well-being of humanity. Among the synthetic and semi-synthetic materials, the use of natural bio-based monomeric materials presents a possible novel avenue for the development of new biocompatible, biodegradable, and non-toxic products. The purpose of this article is to review the information on the role of natural bio-based monomers in biomedical applications. Increased eco-friendliness, biocompatibility, biodegradability, non-toxicity, and intrinsic biological activity are some of the attributes which make itaconic, succinic, citric, hyaluronic, and glutamic acids suitable potential materials for biomedical applications. Herein, we summarize the most recent advances in the field over the past ten years and specifically highlight new and interesting discoveries in biomedical applications. Natural origin acid-based bio-monomers for biomedical applications.
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Affiliation(s)
- Mallinath S Birajdar
- Department of Integrative Engineering, Chung-Ang University, Seoul, Republic of Korea
| | - Haejin Joo
- Department of Integrative Engineering, Chung-Ang University, Seoul, Republic of Korea
| | - Won-Gun Koh
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, Republic of Korea
| | - Hansoo Park
- Department of Integrative Engineering, Chung-Ang University, Seoul, Republic of Korea.
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de Bie TH, Witkamp RF, Jongsma MA, Balvers MGJ. Development and validation of a UPLC-MS/MS method for the simultaneous determination of gamma-aminobutyric acid and glutamic acid in human plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1164:122519. [PMID: 33454439 DOI: 10.1016/j.jchromb.2020.122519] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 11/02/2020] [Accepted: 12/22/2020] [Indexed: 11/15/2022]
Abstract
Gamma-aminobutyric acid (GABA) and its precursor glutamic acid are important neurotransmitters. Both are also present in peripheral tissues and the circulation, where abnormal plasma concentrations have been linked to specific mental disorders. In addition to endogenous synthesis, GABA and glutamic acid can be obtained from dietary sources. An increasing number of studies suggest beneficial cardio-metabolic effects of GABA intake, and therefore GABA is being marketed as a food supplement. The need for further research into their health effects merits accurate and sensitive methods to analyze GABA and glutamic acid in plasma. To this end, an ultra-pressure liquid chromatography coupled to tandem mass spectrometry (UPLC-MS/MS) method was developed and validated for the quantification of GABA and glutamic acid in human plasma. Samples were prepared by a protein precipitation step and subsequent solid phase extraction using acetonitrile. Chromatographic separation was achieved on an Acquity UPLC HSS reversed phase C18 column using gradient elution. Analytes were detected using electrospray ionization and selective reaction monitoring. Standard curve concentrations for GABA ranged from 3.4 to 2500 ng/mL and for glutamic acid from 30.9 ng/mL to 22,500 ng/mL. Within- and between-day accuracy and precision were <10% in quality control samples at low, medium and high concentrations for both GABA and glutamic acid. GABA and glutamic acid were found to be stable in plasma after freeze-thaw cycles and up to 12 months of storage. The validated method was applied to human plasma from 17 volunteers. The observed concentrations ranged between 11.5 and 20.0 ng/ml and 2269 and 7625 ng/ml for respectively GABA and glutamic acid. The reported method is well suited for the measurement of plasma GABA and glutamic acid in pre-clinical or clinical studies.
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Affiliation(s)
- Tessa H de Bie
- Division of Human Nutrition and Health, Wageningen University & Research, P.O. Box 17, 6700 AA Wageningen, the Netherlands; Wageningen Plant Research, Wageningen University & Research, P.O. Box 16, 6700 AA Wageningen, the Netherlands.
| | - Renger F Witkamp
- Division of Human Nutrition and Health, Wageningen University & Research, P.O. Box 17, 6700 AA Wageningen, the Netherlands
| | - Maarten A Jongsma
- Wageningen Plant Research, Wageningen University & Research, P.O. Box 16, 6700 AA Wageningen, the Netherlands
| | - Michiel G J Balvers
- Division of Human Nutrition and Health, Wageningen University & Research, P.O. Box 17, 6700 AA Wageningen, the Netherlands
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Sakai R, Ooba Y, Watanabe A, Nakamura H, Kawamata Y, Shimada T, Takumi A, van Goudoever JB, Narita T. Glutamate metabolism in a human intestinal epithelial cell layer model. Amino Acids 2020; 52:1505-1519. [PMID: 33180203 DOI: 10.1007/s00726-020-02908-2] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 10/30/2020] [Indexed: 01/04/2023]
Abstract
Plasma glutamate concentrations are constant despite dynamic changes in diets. Most likely, virtually all the dietary glutamate is metabolized in the gut. The present study investigated permeability and metabolism of dietary glutamate in a Caco-2 intestinal epithelial cell layer model by tracing the fate of [U-13C] or [15N]glutamate added to the apical medium. For comparison, several other labelled essential and non-essential amino acids were tested as well. Almost all the labelled glutamate in the apical medium (98% and 96% at 24 h of the culture, respectively) was incorporated in the cell layer, while it barely appeared at the basolateral side, indicating an almost complete utilization of glutamate. Indeed, the 13C was incorporated into alanine, proline, ornithine, and glutamine, and the 15N was incorporated into alanine, glutamine, ornithine, proline, branched chain amino acids and also found as ammonia indicative of oxidation. In contrast, substantial apical-to-basolateral transport of amino acids (8-85% of uptake) other than glutamate and aspartate was evident in studies using amino acid tracers labelled with 13C, 15N or D. These results suggest that the intestinal epithelial cell monolayer utilizes dietary glutamate which adds to maintaining glutamate homeostasis in the body.
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Affiliation(s)
- Ryosei Sakai
- Research Institute for Bioscience Products and Fine Chemicals, Ajinomoto Co., Inc, 1-1 Suzuki-cho, Kawasaki, 210-8681, Japan.
| | - Yuri Ooba
- Research Institute for Bioscience Products and Fine Chemicals, Ajinomoto Co., Inc, 1-1 Suzuki-cho, Kawasaki, 210-8681, Japan
| | - Akiko Watanabe
- Research Institute for Bioscience Products and Fine Chemicals, Ajinomoto Co., Inc, 1-1 Suzuki-cho, Kawasaki, 210-8681, Japan
| | - Hidehiro Nakamura
- Research Institute for Bioscience Products and Fine Chemicals, Ajinomoto Co., Inc, 1-1 Suzuki-cho, Kawasaki, 210-8681, Japan
| | - Yasuko Kawamata
- Research Institute for Bioscience Products and Fine Chemicals, Ajinomoto Co., Inc, 1-1 Suzuki-cho, Kawasaki, 210-8681, Japan
| | - Tomoko Shimada
- Research Institute for Bioscience Products and Fine Chemicals, Ajinomoto Co., Inc, 1-1 Suzuki-cho, Kawasaki, 210-8681, Japan
| | - Asuka Takumi
- Research Institute for Bioscience Products and Fine Chemicals, Ajinomoto Co., Inc, 1-1 Suzuki-cho, Kawasaki, 210-8681, Japan
| | - Johannes B van Goudoever
- Department of Pediatrics, Amsterdam UMC Vrije Universiteit, University of Amsterdam, Emma Children's Hospital, Amsterdam, The Netherlands
| | - Takahiro Narita
- Research Institute for Bioscience Products and Fine Chemicals, Ajinomoto Co., Inc, 1-1 Suzuki-cho, Kawasaki, 210-8681, Japan
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Bejarbaneh M, Moradi-Shoeili Z, Jalali A, Salehzadeh A. Synthesis of Cobalt Hydroxide Nano-flakes Functionalized with Glutamic Acid and Conjugated with Thiosemicarbazide for Anticancer Activities Against Human Breast Cancer Cells. Biol Trace Elem Res 2020; 198:98-108. [PMID: 31983053 DOI: 10.1007/s12011-020-02049-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [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] [Received: 08/18/2019] [Accepted: 01/15/2020] [Indexed: 12/21/2022]
Abstract
In recent years, researchers were attracted to nanomaterials components for their potential role in cancer treatment. This study aimed to develop a novel and biocompatible cobalt hydroxide (Co(OH)2) nano-flakes that is functionalized by glutamic acid (Glu) and conjugated to thiosemicarbazide (TSC) for anticancer activities against human breast cancer MCF-7 cells. Physico-chemical properties of the Co(OH)2@Glu-TSC nanomaterial are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis, and Fourier-transform infrared (FT-IR) spectroscopy. MTT assay, flow cytometry, and caspase-3 activity analysis used for evaluating anticancer properties of the Co(OH)2@Glu-TSC nanomaterial. The MTT assay result showed cellular uptake of Co(OH)2@Glu-TSC and cell viability loss in a concentration-dependent. Results of flow cytometry and caspase-3 activity analysis indicated the stimulation of apoptosis through an increase in Caspase-3 and nucleus fragmentation. In general, our findings indicate the anticancer activities of Co(OH)2@Glu-TSC nanomaterial and so it can be considered as a new treatment for breast cancer. However, further in vivo studies are required to evaluate the accumulation of Co(OH)2@Glu-TSC nanomaterial in healthy organs, such as the liver, kidneys, brain, and testes, and potential toxic effects.
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Affiliation(s)
- Mona Bejarbaneh
- Department of Biology, Rasht Branch, Islamic Azad University, Rasht, Iran
| | - Zeinab Moradi-Shoeili
- Department of Chemistry, Faculty of Sciences, University of Guilan, P.O. Box 41335-1914, Rasht, Iran
| | - Amir Jalali
- Department of Biology, Faculty of Sciences, Arak University, Arak, Iran
| | - Ali Salehzadeh
- Department of Biology, Rasht Branch, Islamic Azad University, Rasht, Iran.
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30
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López DE, Ballaz SJ. The Role of Brain Cyclooxygenase-2 (Cox-2) Beyond Neuroinflammation: Neuronal Homeostasis in Memory and Anxiety. Mol Neurobiol 2020; 57:5167-5176. [PMID: 32860157 DOI: 10.1007/s12035-020-02087-x] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [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: 03/25/2020] [Accepted: 08/24/2020] [Indexed: 12/13/2022]
Abstract
Cyclooxygenases are a group of heme-containing isozymes (namely Cox-1 and Cox-2) that catalyze the conversion of arachidonic acid to largely bioactive prostaglandins (PGs). Cox-1 is the ubiquitous housekeeping enzyme, and the mitogen-inducible Cox-2 is activated to cause inflammation. Interestingly, Cox-2 is constitutively expressed in the brain at the postsynaptic dendrites and excitatory terminals of the cortical and spinal cord neurons. Neuronal Cox-2 is activated in response to synaptic excitation to yield PGE2, the predominant Cox-2 metabolite in the brain, which in turn stimulates the release of glutamate and neuronal firing in a retrograde fashion. Cox-2 is also engaged in the metabolism of new endocannabinoids from 2-arachidonoyl-glycerol to modulate their actions at presynaptic terminals. In addition to these interactions, the induction of neuronal Cox-2 is coupled to the trans-synaptic activation of the dopaminergic mesolimbic system and some serotoninergic receptors, which might contribute to the development of emotional behavior. Although much of the focus regarding the induction of Cox-2 in the brain has been centered on neuroinflammation-related neurodegenerative and psychiatric disorders, some evidence also suggests that Cox-2 release during neuronal signaling may be pivotal for the fine tuning of cortical networks to regulate behavior. This review compiles the evidence supporting the homeostatic role of neuronal Cox-2 in synaptic transmission and plasticity, since neuroinflammation is originally triggered by the induction of glial Cox-2 expression. The goal is to provide perspective on the roles of Cox-2 beyond neuroinflammation, such as those played in memory and anxiety, and whose evidence is still scant.
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Affiliation(s)
- Diana E López
- Biomedical Sciences Graduate Program, Yachay Tech University, Urcuquí, Ecuador
| | - Santiago J Ballaz
- School of Biological Sciences and Engineering, Yachay Tech University, Hacienda San José s/n, San Miguel de Urcuquí, Ecuador.
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Özkan E, Nemutlu E, Beksac MS, Kır S. GC-MS analysis of seven metabolites for the screening of pregnant women with Down Syndrome fetuses. J Pharm Biomed Anal 2020; 188:113427. [PMID: 32683283 DOI: 10.1016/j.jpba.2020.113427] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 05/18/2020] [Accepted: 06/11/2020] [Indexed: 01/14/2023]
Abstract
Down Syndrome is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. Metabolomics is identification and quantification of small-molecule metabolites (molecular weight <1000 Da) in tissues, cells and physiological fluids within a certain period time. Metabolites are intermediate products of various types of biochemical reactions that participate in bonding metabolic pathways. In this study, metabolites such as 2-Hydroxybutyric acid, 3-Hydroxybutyric acid, β-Hydroxyisovaleric acid, Uracil, Glutamic acid, Maltose and Melezitose were chosen as the possible determinants/markers for the prenatal screening of Down Syndrome. Quantitative analysis of the metabolites conducted by GCMS method using 5 % phenyl / 95 % dimethylpolysiloxane (30 m ×0.25 mm, 0.25 μm film thickness) capillary column. The oven temperature was held constant at 60 °C for 1 min and ramped at 10 °C /min to 200 °C then ramped at 30 °C/min to 320 °C and hold for 6 min before cool-down, as helium mobile phase and flow rate of 2.8 mL/min and adding Myristic acid-d27 as an internal standard. Our method was validated by parameters of system suitability, stability, linearity, sensitivity, accuracy, precision, selectivity, robustness and ruggedness. The developed and validated method was applied to plasma samples taken from pregnant women with Down Syndrome (study group) and euploid fetuses (healthy group). The levels of these seven metabolites are statistically different (p < 0.05 for all) between the groups. It can be concluded that these relevant metabolites might be used for the prenatal screening of Down Syndrome.
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Affiliation(s)
- Ece Özkan
- Department of Analytical Chemistry, Faculty of Pharmacy, Hacettepe University, 06100 Sıhhıye, Ankara, Turkey.
| | - Emirhan Nemutlu
- Department of Analytical Chemistry, Faculty of Pharmacy, Hacettepe University, 06100 Sıhhıye, Ankara, Turkey
| | - Mehmet Sinan Beksac
- Division of Perinatology, Department of Obstetrics and Gynecology, Faculty of Medicine, Hacettepe University, 06100 Sıhhıye, Ankara, Turkey
| | - Sedef Kır
- Department of Analytical Chemistry, Faculty of Pharmacy, Hacettepe University, 06100 Sıhhıye, Ankara, Turkey
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Liao JW, Wang SS, Yang HH, Ma P, Li CR, Pan JY. [Comparative analysis of serum glutamate and gamma-aminobutyric acid levels in patients with bipolar depressive disorder and major depression disorder]. Zhonghua Yi Xue Za Zhi 2020; 100:1800-1804. [PMID: 32536126 DOI: 10.3760/cma.j.cn112137-20191025-02319] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the difference of serum glutamate (Glu) and gamma- aminobutyric acid (GABA) levels between depressive patients and bipolar disorder patients with depressive episodes. Methods: From May 2018 to March 2019, forty-seven patients with depression (depression group) and 45 patients with bipolar depressive episode (bipolar depression group) were selected from the department of psychiatry, the First Affiliated Hospital of Jinan University, and 41 healthy controls (healthy control group) were simultaneously recruited from the community. The subjects' depression and anxiety were assessed by 17 items of Hamilton depression scale (HAMD-17) and Hamilton Anxiety Scale (HAMA). The serum levels of Glu, GABA and Glu decarboxylase (GAD) were detected by enzyme-linked immunosorbent assay (ELISA) . Results: The serum Glu level ( (36±7) mg/L, (37±7) mg/L vs (28±4) mg/L, F=10.97, P<0.01) and Glu/GABA ratio (5.77±0.35, 8.18±0.24 vs 3.35±0.33, F=37.68, P<0.01) in depression and bipolar depression groups were higher than those of healthy control group, while the GABA level ((6.1±0.7) μmol/L,(4.1±0.8) μmol/L vs (8.1±1.2) μmol/L, F=21.61, P<0.01) and GAD ((31±6) U/L, (31±6) U/L vs (35±6) U/L, F=5.61, P<0.01) were lower than those of healthy control group. The level of serum GABA in bipolar depression group was lower than that in depression group. However, Glu/GABA was higher in bipolar depression group than that in depression group (P<0.01). The level of serum GABA in depression group was negatively correlated with HAMD sleep disorder factor (r=-0.46, P=0.01). Conclusions: Both depression and bipolar depression have abnormal levels of Glu, GABA neurotransmitters and imbalance between Glu and GABA in peripheral blood circulation. Moreover, these abnormalities are more obvious in patients with bipolar depression.
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Affiliation(s)
- J W Liao
- Department of Psychiatry, the First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - S S Wang
- Sleep Medicine Center, the First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - H H Yang
- Department of Psychiatry, the First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - P Ma
- Department of Psychiatry, the First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - C R Li
- Department of Psychiatry, the First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - J Y Pan
- Department of Psychiatry, the First Affiliated Hospital of Jinan University, Guangzhou 510630, China
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Ketenci S, Acet NG, Sarıdoğan GE, Aydın B, Cabadak H, Gören MZ. The Neurochemical Effects of Prazosin Treatment on Fear Circuitry in a Rat Traumatic Stress Model. Clin Psychopharmacol Neurosci 2020; 18:219-230. [PMID: 32329303 PMCID: PMC7242110 DOI: 10.9758/cpn.2020.18.2.219] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 09/03/2019] [Accepted: 09/06/2019] [Indexed: 02/04/2023]
Abstract
Objective The timing of administration of pharmacologic agents is crucial in traumatic stress since they can either potentiate the original fear memory or may cause fear extinction depending on the phase of fear conditioning. Brain noradrenergic system has a role in fear conditioning. Data regarding the role of prazosin in traumatic stress are controversial. Methods In this study, we examined the effects of prazosin and the noradrenergic system in fear conditioning in a predator stress rat model. We evaluated the direct or indirect effects of stress and prazosin on noradrenaline (NA), gamma-aminobuytyric acid (GABA), glutamate, glycine levels and choline esterase activity in the amygdaloid complex, the dorsal hippocampus, the prefrontal cortex and the rostral pons. Results Our results demonstrated that prazosin might alleviate defensive behaviors and traumatic stress symptoms when given during the traumatic cue presentation in the stressed rats. However prazosin administration resulted in higher anxiety levels in non stressed rats when the neutral cue was presented. Conclusion Prazosin should be used in PTSD with caution because prazosin might exacerbate anxiety in non-traumatized subjects. However prazosin might as well alleviate stress responses very effectively. Stress induced changes included increased NA and GABA levels in the amygdaloid complex in our study, attributing noradrenaline a possible inhibitory role on fear acquisition. Acetylcholine also has a role in memory modulation in the brain. We also demonstrated increased choline esterase acitivity. Cholinergic modulation might be another target for indirect prazosin action which needs to be further studied.
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Affiliation(s)
- Sema Ketenci
- Department of Medical Pharmacology, Marmara University School of Medicine, Istanbul, Turkey
| | - Nazife Gökçe Acet
- Department of Medical Pharmacology, Medeniyet University, Faculty of Medicine, Istanbul, Turkey
| | - Gökçe Elif Sarıdoğan
- Department of Medical Pharmacology, Marmara University School of Medicine, Istanbul, Turkey.,Department of Psychiatry, Erenköy Mental Health and Research Hospital, Istanbul, Turkey
| | - Banu Aydın
- Department of Biophysics, Marmara University, Faculty of Medicine, Istanbul, Turkey
| | - Hülya Cabadak
- Department of Biophysics, Marmara University, Faculty of Medicine, Istanbul, Turkey
| | - Mehmet Zafer Gören
- Department of Medical Pharmacology, Marmara University School of Medicine, Istanbul, Turkey
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Jiang H, Holm J, Vidlund M, Vanky F, Friberg Ö, Yang Y, Svedjeholm R. The impact of glutamate infusion on postoperative NT-proBNP in patients undergoing coronary artery bypass surgery: a randomized study. J Transl Med 2020; 18:193. [PMID: 32393387 DOI: 10.1186/s12967-020-02351-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 04/25/2020] [Indexed: 12/28/2022] Open
Abstract
Background Glutamate, a key intermediate in myocardial metabolism, may enhance myocardial recovery after ischemia and possibly reduce the incidence and severity of postoperative heart failure in coronary artery bypass surgery (CABG). N-terminal pro-B-type natriuretic peptide (NT-proBNP) can be used to assess postoperative heart failure (PHF) after CABG. Our hypothesis was that glutamate enhances myocardial recovery in post-ischemic heart failure and, therefore, will be accompanied by a mitigated postoperative increase of NT-proBNP. Methods Substudy of the GLUTAmate for Metabolic Intervention in Coronary Surgery (GLUTAMICS) trial (ClinicalTrials.gov Identifier: NCT00489827) a prospective triple-center double-blind randomized clinical trial on 399 patients undergoing CABG with or without concomitant procedure for acute coronary syndrome at three Swedish Cardiac Surgery centres (Linköping, Örebro, and Karlskrona) from May 30, 2007 to November 12, 2009. Patients were randomly assigned to intravenous infusion of 0.125 M l-glutamic acid or saline (1.65 mL/kg of body weight per hour) intraoperatively and postoperatively. Plasma NT-proBNP was measured preoperatively, the first (POD1) and third postoperative morning (POD3). A Clinical Endpoints Committee, blinded to both intervention and NT-proBNP used prespecified criteria to diagnose PHF. The primary endpoints were the absolute levels of postoperative NT-proBNP and the difference between preoperative and postoperative levels of NT-proBNP. Results Overall no significant difference was detected in postoperative NT-proBNP levels between groups. However, in high-risk patients (upper quartile of EuroSCORE II ≥ 4.15; glutamate group n = 56; control group n = 45) glutamate was associated with significantly lower postoperative increase of NT-proBNP (POD3-Pre: 3900 [2995–6260] vs. 6745 [3455–12,687] ng•L−1, p = 0.012) and lower NT-proBNP POD3 (POD3: 4845 [3426–7423] vs. 8430 [5370–14,100] ng•L−1, p = 0.001). After adjusting for significant differences in preoperative demographics, NT-proBNP POD3 in the glutamate group was 0.62 times of that in the control group (p = 0.002). Patients in the glutamate group also had shorter ICU stay (21 [19–26] vs. 25 [22–46] h, p = 0.025) and less signs of myocardial injury (Troponin T POD3 (300 [170–500] vs. 560 [210–910] ng•L−1, p = 0.025). Conclusions Post hoc analysis of postoperative NT-proBNP suggests that intravenous infusion of glutamate may prevent or mitigate myocardial dysfunction in high-risk patients undergoing CABG. Further studies are necessary to confirm these findings. Trial registration Swedish Medical Products Agency 151:2003/70403 (prospectively registered with amendment about this substudy filed March 17, 2007). ClinicalTrials.gov Identifier: NCT00489827 (retrospectively registered) https://clinicaltrials.gov/ct2/show/NCT00489827?term=glutamics&draw=1&rank=1
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Jarestan M, Khalatbari K, Pouraei A, Sadat Shandiz SA, Beigi S, Hedayati M, Majlesi A, Akbari F, Salehzadeh A. Preparation, characterization, and anticancer efficacy of novel cobalt oxide nanoparticles conjugated with thiosemicarbazide. 3 Biotech 2020; 10:230. [PMID: 32399380 DOI: 10.1007/s13205-020-02230-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 04/26/2020] [Indexed: 01/26/2023] Open
Abstract
Gastric cancer is one of the most common cancers in modern societies. Previous studies have shown that the use of nanoparticle complexes is effective in the treatment of cancer. The aim of this study was to investigate the cytotoxicity and anticancer properties of cobalt oxide (Co3O4) nanoparticles (NPs) functionalized by glutamic acid (Glu) and conjugated with thiosemicarbazide (TSC) on gastric cancer (AGS) cell line. First, the Co3O4@Glu/TSC nanoparticles were synthesized via co-condensation reaction. Fourier-transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) tests were performed for identifying the morphology, structure, size and functional groups of produced nanoparticles. MTT assay was also performed to evaluate cytotoxicity effect. Moreover, Annexin V/PI staining with flow cytometry analysis, caspase-3 activation assay, and Hoechst 33258 staining was carried out for evaluating apoptosis. The FTIR results showed that the components of Co3O4@Glu/TSC NPs complex were successfully fabricated. Crystallographic structure of Co3O4@Glu/TSC NPs was confirmed by XRD patterns. SEM results indicated that the size of the nanoparticles was in the range of 16-40 nm. An EDX spectrum was determined and data explained the existence of cobalt as the prominent element. MTT test results showed that AGS cell life was significantly decreased compared to the control group with increasing concentration of nanoparticles (dose-dependent) (P < 0.05), IC50 = 107.5 μg/mL. The results of flow cytometry assay and caspase-3 activity showed that fabricated Co3O4@Glu/TSC NPs induced apoptosis in the treated group. Moreover, Co3O4@Glu/TSC NPs treated AGS cells indicate an increase in the apoptotic characteristics including nuclear fragmentation. In the current work, the promising cytotoxicity and anti-cancer activities of Co3O4@Glu/TSC NPs complex toward gastric cancer (AGS) cell line were showed and it can be suggested for the drug delivery system.
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Affiliation(s)
- Mahsa Jarestan
- 1Department of Biology, Rasht Branch, Islamic Azad University, Rasht, Iran
| | - Kimia Khalatbari
- 1Department of Biology, Rasht Branch, Islamic Azad University, Rasht, Iran
| | - Ayda Pouraei
- 2Department of Medical Sciences, Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | | | - Sadaf Beigi
- 1Department of Biology, Rasht Branch, Islamic Azad University, Rasht, Iran
| | - Mohammad Hedayati
- 4Department of Cell and Molecular Biology, University of Guilan, Rasht, Iran
| | - Amitis Majlesi
- 1Department of Biology, Rasht Branch, Islamic Azad University, Rasht, Iran
| | - Fatemeh Akbari
- Department of Biology, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
| | - Ali Salehzadeh
- 1Department of Biology, Rasht Branch, Islamic Azad University, Rasht, Iran
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Coyle JT, Balu D, Wolosker H. D-Serine, the Shape-Shifting NMDA Receptor Co-agonist. Neurochem Res 2020; 45:1344-53. [PMID: 32189130 DOI: 10.1007/s11064-020-03014-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 03/04/2020] [Accepted: 03/11/2020] [Indexed: 12/17/2022]
Abstract
Shape-shifting, a phenomenon wide-spread in folklore, refers to the ability to physically change from one identity to another, typically from an innocuous entity to a destructive one. The amino acid D-serine over the last 25 years has "shape-shifted" into several identities: a purported glial transmitter activating N-methyl-D-aspartate receptors (NMDARs), a co-transmitter concentrated in excitatory glutamatergic neurons, an autocrine that is released at dendritic spines to prime their post-synaptic NMDARs for an instantaneous response to glutamate and an excitotoxic moiety released from inflammatory (A1) astrocytes. This article will review evidence in support of these scenarios and the artifacts that misled investigators of the true identity of D-serine.
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Pedraz-Petrozzi B, Elyamany O, Rummel C, Mulert C. Effects of inflammation on the kynurenine pathway in schizophrenia - a systematic review. J Neuroinflammation 2020; 17:56. [PMID: 32061259 PMCID: PMC7023707 DOI: 10.1186/s12974-020-1721-z] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 01/20/2020] [Indexed: 12/30/2022] Open
Abstract
Background In the last decade, there has been growing evidence that an interaction exists between inflammation and the kynurenine pathway in schizophrenia. Additionally, many authors found microglial activation in cases of schizophrenia due to inflammatory mechanisms related mostly to an increase of pro-inflammatory cytokines. In order to gain new insights into the pathophysiology of schizophrenia, it is important to incorporate the latest published evidence concerning inflammatory mechanisms and kynurenine metabolism. This systematic review aims to collect reliable recent findings within the last decade supporting such a theory. Methods A structured search of electronic databases was conducted for publications between 2008 and 2018 to identify eligible studies investigating patients with schizophrenia/psychosis and the relationship between inflammation and kynurenine pathway. Applicable studies were systematically scored using the NIH Quality Assessment Tools. Two researchers independently extracted data on diagnosis (psychosis/schizophrenia), inflammation, and kynurenine/tryptophan metabolites. Results Ten eligible articles were identified where seven studies assessed blood samples and three assessed cerebrospinal fluid in schizophrenic patients. Of these articles:
Four investigated the relationship between immunoglobulins and the kynurenine pathway and found correlations between IgA-mediated responses and levels of tryptophan metabolites (i.e., kynurenine pathway). Five examined the correlation between cytokines and kynurenine metabolites where three showed a relationship between elevated IL-6, TNF-α concentrations, and the kynurenine pathway. Only one study discovered correlations between IL-8 and the kynurenine pathway. Two studies showed correlations with lower concentrations of IL-4 and the kynurenine pathway. Moreover, this systematic review did not find a significant correlation between CRP (n = 1 study), IFN-γ (n = 3 studies), and the kynurenine pathway in schizophrenia.
Interpretation These results emphasize how different inflammatory markers can unbalance the tryptophan/kynurenine pathway in schizophrenia. Several tryptophan/kynurenine pathway metabolites are produced which can, in turn, underlie different psychotic and cognitive symptoms via neurotransmission modulation. However, due to heterogeneity and the shortage of eligible articles, they do not robustly converge to the same findings. Hence, we recommend further studies with larger sample sizes to elucidate the possible interactions between the various markers, their blood vs. CSF ratios, and their correlation with schizophrenia symptoms.
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Affiliation(s)
- Bruno Pedraz-Petrozzi
- Center of Psychiatry, Justus-Liebig University, Klinikstrasse 36, Giessen, 35392, Hessen, Germany. .,Giessen Graduate School for Life Sciences, Justus-Liebig University, Leihgesterner Weg 52, Giessen, 35392, Hessen, Germany.
| | - Osama Elyamany
- Center of Psychiatry, Justus-Liebig University, Klinikstrasse 36, Giessen, 35392, Hessen, Germany.,Alexandria University, 22 El-Guish Road, Alexandria, 21526, Alexandria, Egypt.,Collaborative Research Center 936 (SFB936) - Project C6 - Third Funding Period, Justus-Liebig University, Klinikstrasse 36, Giessen, 35392, Hessen, Germany
| | - Christoph Rummel
- Institute of Veterinary Physiology and Biochemistry, Justus-Liebig University, Frankfurter Strasse 100, Giessen, 35392, Hessen, Germany.,Center for Mind, Brain and Behavior (CMBB), Hans-Meerwein-Strasse 6, Marburg, 35043, Hessen, Germany
| | - Christoph Mulert
- Center of Psychiatry, Justus-Liebig University, Klinikstrasse 36, Giessen, 35392, Hessen, Germany.,Giessen Graduate School for Life Sciences, Justus-Liebig University, Leihgesterner Weg 52, Giessen, 35392, Hessen, Germany.,Center for Mind, Brain and Behavior (CMBB), Hans-Meerwein-Strasse 6, Marburg, 35043, Hessen, Germany.,Collaborative Research Center 936 (SFB936) - Project C6 - Third Funding Period, Justus-Liebig University, Klinikstrasse 36, Giessen, 35392, Hessen, Germany
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Baxi NN, Patel S, Hansoti D. An Arthrobacter citreus strain suitable for degrading ε-caprolactam in polyamide waste and accumulation of glutamic acid. AMB Express 2019; 9:161. [PMID: 31605246 PMCID: PMC6789059 DOI: 10.1186/s13568-019-0887-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 09/27/2019] [Indexed: 11/16/2022] Open
Abstract
ε-Caprolactam-a toxic xenobiotic compound present in industrial polyamide waste was found to be degraded by caprolactam-degrading bacteria. Arthrobacter citreus was able to utilize up to 20 g ε-caprolactam/l as the sole source of carbon more efficiently as compared to the other Gram positive caprolactam-degrading bacteria Rhodococcus rhodochrous and Bacillus sphaericus. The cells of A. citreus remained viable in medium up to 40 g caprolactam/l. The degradation of 10 g caprolactam/l by A. citreus, when supplied as the sole source of carbon and nitrogen lead to the formation of 6-aminocaproic acid which was detected in broth and there was also an increase in the ammonium content. One of the other metabolites found to consistently accumulate in extracellular medium during the utilization of caprolactam by A. citreus was glutamic acid, though not reported in case of other caprolactam-degrading bacteria. A. citreus could metabolise caprolactam to form non toxic products such as 6-aminocaproic acid and glutamic acid which are amino acids of physiological and commercial importance. In the presence of 6-aminocaproic acid, the rate of caprolactam utilization by A. citreus was decreased but not inhibited and the viable count of cells was found to increase using both the substrates simultaneously. A. citreus was also suitable for degradation of caprolactam in presence of low phosphate as prevalent in soil, and in sterile soil without the supplementation of any other carbon or nitrogen, as well as in native non sterile soil where other microorganisms are present.
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Xu G, Zha J, Cheng H, Ibrahim MHA, Yang F, Dalton H, Cao R, Zhu Y, Fang J, Chi K, Zheng P, Zhang X, Shi J, Xu Z, Gross RA, Koffas MAG. Engineering Corynebacterium glutamicum for the de novo biosynthesis of tailored poly-γ- glutamic acid. Metab Eng 2019; 56:39-49. [PMID: 31449877 DOI: 10.1016/j.ymben.2019.08.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [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: 05/03/2019] [Revised: 08/15/2019] [Accepted: 08/17/2019] [Indexed: 11/17/2022]
Abstract
γ-Polyglutamic acid (γ-PGA) is a biodegradable polymer naturally produced by Bacillus spp. that has wide applications. Fermentation of γ-PGA using Bacillus species often requires the supplementation of L-glutamic acid, which greatly increases the overall cost. Here, we report a metabolically engineered Corynebacterium glutamicum capable of producing γ-PGA from glucose. The genes encoding γ-PGA synthase complex from B. subtilis (pgsB, C, and A) or B. licheniformis (capB, C, and A) were expressed under inducible promoter Ptac in a L-glutamic acid producer C. glutamicum ATCC 13032, which led to low levels of γ-PGA production. Subsequently, C. glutamicum F343 with a strong L-glutamic acid production capability was tested. C. glutamicum F343 carrying capBCA produced γ-PGA up to 11.4 g/L, showing a higher titer compared with C. glutamicum F343 expressing pgsBCA. By introducing B. subtilis glutamate racemase gene racE under Ptac promoter mutants with different expression strength, the percentage of L-glutamic acid units in γ-PGA could be adjusted from 97.1% to 36.9%, and stayed constant during the fermentation process, while the γ-PGA titer reached 21.3 g/L under optimal initial glucose concentrations. The molecular weight (Mw) of γ-PGA in the engineered strains ranged from 2000 to 4000 kDa. This work provides a foundation for the development of sustainable and cost-effective de novo production of γ-PGA from glucose with customized ratios of L-glutamic acid in C. glutamicum.
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Affiliation(s)
- Guoqiang Xu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China; Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, United States; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, China
| | - Jian Zha
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, United States
| | - Hui Cheng
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, China
| | - Mohammad H A Ibrahim
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, United States; Chemistry of Natural and Microbial Products Department, National Research Centre, Al-Bohoos St., Cairo, 12622, Egypt
| | - Fan Yang
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, United States
| | - Hunter Dalton
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, United States
| | - Rong Cao
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, China
| | - Yaxin Zhu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, China
| | - Jiahua Fang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, China
| | - Kaijun Chi
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, China
| | - Pu Zheng
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China
| | - Xiaomei Zhang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China; Laboratory of Pharmaceutical Engineering, School of Pharmaceutics, Jiangnan University, Wuxi, 214122, China
| | - Jinsong Shi
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China; Laboratory of Pharmaceutical Engineering, School of Pharmaceutics, Jiangnan University, Wuxi, 214122, China
| | - Zhenghong Xu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Wuxi, 214122, China; Laboratory of Pharmaceutical Engineering, School of Pharmaceutics, Jiangnan University, Wuxi, 214122, China.
| | - Richard A Gross
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, United States; Chemistry of Natural and Microbial Products Department, National Research Centre, Al-Bohoos St., Cairo, 12622, Egypt; Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA.
| | - Mattheos A G Koffas
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu, 214122, China; Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, United States; Chemistry of Natural and Microbial Products Department, National Research Centre, Al-Bohoos St., Cairo, 12622, Egypt; Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA; Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, NY, USA.
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Bratzu J, Bharatiya R, Manca E, Cocco C, Argiolas A, Melis MR, Sanna F. Oxytocin induces penile erection and yawning when injected into the bed nucleus of the stria terminalis: A microdialysis and immunohistochemical study. Behav Brain Res 2019; 375:112147. [PMID: 31408664 DOI: 10.1016/j.bbr.2019.112147] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/06/2019] [Accepted: 08/07/2019] [Indexed: 12/13/2022]
Abstract
Oxytocin (5, 20 and 100 ng) injected unilaterally into the bed nucleus of the stria terminalis (BNST) of male rats stereotaxically implanted with a microinjection cannula coupled to a microdialysis probe, induces penile erection and yawning that occur concomitantly with a dose-dependent increase in the extracellular concentration of glutamic acid, dopamine and its main metabolite 3,4-dihydroxyphenilacetic acid (DOPAC), and nitrites (NO2-) in the dialysate obtained from the BNST by intracerebral microdialysis. The responses induced by oxytocin (100 ng) were all abolished by the oxytocin receptor antagonist d(CH2)5Tyr(Me)2-Orn8-vasotocin (1 μg), and reduced by CNQX (1 μg), a competitive antagonist of the AMPA receptors, both given into the BNST 25 min before oxytocin. In contrast, (+) MK-801 (1 μg), a non-competitive antagonist of NMDA receptors, and SCH 23390 (1 μg), a selective dopamine D1 receptor antagonist, reduced penile erection and yawning, but not glutamic acid and dopamine increases in the BNST dialysate induced by oxytocin. Immunohistochemistry revealed oxytocin-labelled neuronal structures in close proximity to tyrosine hydroxylase-labelled neurons or nitric oxide synthase-labelled cell bodies surrounded by intense vesicular glutamate transporter1-stained synapses in BNST sections where oxytocin injections induce the above responses. Together, these findings show that oxytocin injected into the BNST induces penile erection and yawning by activating not only the glutamatergic (and nitrergic) but also the dopaminergic neurotransmission, leading in turn to the activation of neural pathways mediating penile erection and yawning.
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Gamarra Y, Santiago FC, Molina-López J, Castaño J, Herrera-Quintana L, Domínguez Á, Planells E. Pyro glutamic acidosis by glutathione regeneration blockage in critical patients with septic shock. Crit Care 2019; 23:162. [PMID: 31064391 PMCID: PMC6505226 DOI: 10.1186/s13054-019-2450-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Accepted: 04/17/2019] [Indexed: 12/14/2022]
Abstract
AIM The aim of this study was to evaluate oxidative stress from glutathione depletion in critically ill patients with a septic shock through the abnormal presence of pyroglutamic acid (PyroGlu) in the urine (indirectly) and through its serum level (directly). METHODS This was a prospective analytical study of 28 critically ill patients with a septic shock who were monitored from admission (initial) to 3 days of stay (final) in the intensive care unit (ICU). Data collected included PyroGlu and glutamic acid (Glu) using liquid chromatography/mass spectrometry, and glutathione peroxidase (GPX) activity with a colorimetric assay. The differences in Glu, PyroGlu, and GPX activity between the septic shock group and healthy control group serving as reference values were evaluated using the Mann-Whitney test. The correlations between Glu, PyroGlu, and GPX activity and clinical outcomes were determined using Spearman's correlation coefficient. RESULTS In patients with septic shock, serum and urine PyroGlu levels were higher, erythrocyte GPX activity/gr Hb was lower, and urine Glu levels were lower compared to healthy control reference values, for both initial and final values. Initial serum Glu levels were also lower. Serum PyroGlu levels had a correlation with both initial and final serum Glu levels; levels also correlated in the urine. Initial serum Glu correlated with the days of mechanical ventilation (P = 0.016) and the days of ICU stay (P = 0.05). Urine Glu/mg creatinine correlated with APACHE II (P = 0.030). This positive correlation observed for serum Glu was not observed for PyroGlu. CONCLUSIONS The current study found that septic patients have higher levels of PyroGlu, lower levels of Glu, and lower erythrocyte GPX activity, suggesting that these biomarkers could be used as an indicator of glutathione depletion. In addition, Glu is related to severity parameters. This study can guide future studies on the importance of monitoring the levels of pyroglutamic acidosis in critical patients with septic shock in order to preserve the oxidative status and its evolution during the stay in the ICU.
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Affiliation(s)
- Yenifer Gamarra
- Department of Physiology, Faculty of Pharmacy, Institute of Nutrition and Food Technology "José Mataix", Biomedical Research Center, University of Granada, Health Campus, Adv. del Conocimiento S/N, 18071, Granada, Spain. .,Clinical Analysis Unit, San Cecilio Hospital, 18016, Granada, Spain.
| | - Felipe C Santiago
- Intensive Care Unit, Virgen de las Nieves Hospital, 18014, Granada, Spain
| | - Jorge Molina-López
- Department of Physiology, Faculty of Pharmacy, Institute of Nutrition and Food Technology "José Mataix", Biomedical Research Center, University of Granada, Health Campus, Adv. del Conocimiento S/N, 18071, Granada, Spain
| | - José Castaño
- Intensive Care Unit, Virgen de las Nieves Hospital, 18014, Granada, Spain
| | - Lourdes Herrera-Quintana
- Department of Physiology, Faculty of Pharmacy, Institute of Nutrition and Food Technology "José Mataix", Biomedical Research Center, University of Granada, Health Campus, Adv. del Conocimiento S/N, 18071, Granada, Spain
| | - Álvaro Domínguez
- Department of Physiology, Faculty of Pharmacy, Institute of Nutrition and Food Technology "José Mataix", Biomedical Research Center, University of Granada, Health Campus, Adv. del Conocimiento S/N, 18071, Granada, Spain
| | - Elena Planells
- Department of Physiology, Faculty of Pharmacy, Institute of Nutrition and Food Technology "José Mataix", Biomedical Research Center, University of Granada, Health Campus, Adv. del Conocimiento S/N, 18071, Granada, Spain.
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Shrivas K, Nirmalkar N, Deb MK, Dewangan K, Nirmalkar J, Kumar S. Application of functionalized silver nanoparticles as a biochemical sensor for selective detection of lysozyme protein in milk sample. Spectrochim Acta A Mol Biomol Spectrosc 2019; 213:127-133. [PMID: 30684881 DOI: 10.1016/j.saa.2019.01.039] [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] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Revised: 12/25/2018] [Accepted: 01/15/2019] [Indexed: 06/09/2023]
Abstract
Silver nanoparticles (AgNPs) functionalized with glutamic acid (GA) was used as a biochemical sensing probe in colorimetry for detection of lysozyme protein in milk samples. The method is based on the color change of AgNPs/GA from yellow to reddish-yellow differentiated with naked eyes for qualitative determination and red shift of localized surface plasmon resonance (LSPR) absorption signal intensity of AgNPs/GA in visible region used for quantitative determination of lysozyme. The control experiments were performed to demonstrate the electrostatic force of interactions between AgNPs/GA and protein molecule. A wide linear range of 3-150 nM with limit of detection of 1.5 nM was acquired for quantitative determination of lysozyme using AgNPs/GA as a biochemical sensing probe. The advantages of using AgNPs/GA as a biochemical sensing probe are simple, label-free and economic for determination of lysozyme from milk samples.
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Affiliation(s)
- Kamlesh Shrivas
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur CG-492010, India; Department of Chemistry, Guru Ghasidas Vishwavidyalaya, Koni, Bilaspur CG-495009, India.
| | - Nidhi Nirmalkar
- Department of Chemistry, Guru Ghasidas Vishwavidyalaya, Koni, Bilaspur CG-495009, India
| | - Manas Kanti Deb
- School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur CG-492010, India
| | - Khemchand Dewangan
- Department of Chemistry, Indira Gandhi National Tribal University, Amarkantak MP-484886, India
| | - Jayant Nirmalkar
- Earth and Environmental Sciences, Indian Institute of Science Education and Research Bhopal, Bhauri, Bhopal MP-462066, India
| | - Suneel Kumar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhauri, Bhopal MP-462066, India
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Wiefel L, Wohlers K, Steinbüchel A. Re-evaluation of cyanophycin synthesis in Corynebacterium glutamicum and incorporation of glutamic acid and lysine into the polymer. Appl Microbiol Biotechnol 2019; 103:4033-4043. [PMID: 30937497 DOI: 10.1007/s00253-019-09780-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 03/05/2019] [Accepted: 03/18/2019] [Indexed: 11/29/2022]
Abstract
Corynebacterium glutamicum was only examined in the early 2000s as a possible microorganism for the production of the polyamide cyanophycin (multi-L-arginyl-poly-[L-aspartic acid], CGP). CGP is a potential precursor for the synthesis of polyaspartic acid and CGP-derived dipeptides which may be of use in peptide-based clinical diets, as dietary supplements, or in livestock feeds. In the past, C. glutamicum was disregarded for CGP production due to low CGP contents and difficulties in isolating the polymer. However, considering recent advances in CGP research, the capabilities of this organism were revisited. In this study, several cyanophycin synthetases (CphA) as well as expression vectors and cultivation conditions were evaluated. The ability of C. glutamicum to incorporate additional amino acids such as lysine and glutamic acid was also examined. The strains C. glutamicum pVWEx1::cphAΔ1 and C. glutamicum pVWEx1::cphABP1 accumulated up to 14% of their dry weight CGP, including soluble CGP containing more than 40 mol% of the alternative side-chain amino acid lysine. The soluble, lysine-rich form of the polymer was not detected in C. glutamicum in previous studies. Additionally, an incorporation of up to 6 mol% of glutamic acid into the backbone of CGP synthesized by C. glutamicum pVWEx1::cphADh was detected. The strain accumulated up to 17% of its dry weight in soluble CGP. Although glutamic acid had previously been found to replace arginine in the side chain, this is the first time that glutamic acid was found to substitute aspartic acid in the backbone.
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Affiliation(s)
- Lars Wiefel
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Corrensstraße 3, 48149, Münster, Germany
| | - Karen Wohlers
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Corrensstraße 3, 48149, Münster, Germany
| | - Alexander Steinbüchel
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Corrensstraße 3, 48149, Münster, Germany. .,Environmental Science Department, King Abdulaziz University, Jeddah, Saudi Arabia.
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Wan-Mohtar WAAQI, Ab Kadir S, Halim-Lim SA, Ilham Z, Hajar-Azhari S, Saari N. Vital parameters for high gamma-aminobutyric acid (GABA) production by an industrial soy sauce koji Aspergillus oryzae NSK in submerged-liquid fermentation. Food Sci Biotechnol 2019; 28:1747-1757. [PMID: 31807347 DOI: 10.1007/s10068-019-00602-y] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 03/04/2019] [Accepted: 03/11/2019] [Indexed: 01/08/2023] Open
Abstract
In submerged-liquid fermentation, seven key parameters were assessed using one-factor-at-a-time to obtain the highest GABA yield using an industrial soy sauce koji Aspergillus oryzae strain NSK (AOSNSK). AOSNSK generated maximum GABA at 30 °C (194 mg/L) and initial pH 5 (231 mg/L), thus was able to utilize sucrose (327 mg/L of GABA) for carbon source. Sucrose at 100 g/L, improved GABA production at 646 mg/L. Single nitrogen sources failed to improve GABA production, however a combination of yeast extract (YE) and glutamic acid (GA) improved GABA at 646.78 mg/L. Carbon-to-nitrogen ratio (C8:N3) produced the highest cell (24.01 g/L) and GABA at a minimal time of 216 h. The key parameters of 30 °C, initial pH 5, 100 g/L of sucrose, combination YE and GA, and C8:N3 generated the highest GABA (3278.31 mg/L) in a koji fermentation. AOSNSK promisingly showed for the development of a new GABA-rich soy sauce.
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Affiliation(s)
- Wan Abd Al Qadr Imad Wan-Mohtar
- 1Functional Omics and Bioprocess Development Laboratory, Biotechnology Program, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Safuan Ab Kadir
- 2Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Malaysia
| | - Sarina Abdul Halim-Lim
- 4Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Malaysia
| | - Zul Ilham
- 3Biomass Energy Laboratory, Environmental Science and Management Program, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Siti Hajar-Azhari
- 2Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Malaysia
| | - Nazamid Saari
- 2Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Malaysia
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Wen J, Bao J. Engineering Corynebacterium glutamicum triggers glutamic acid accumulation in biotin-rich corn stover hydrolysate. Biotechnol Biofuels 2019; 12:86. [PMID: 31011369 PMCID: PMC6463653 DOI: 10.1186/s13068-019-1428-5] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 04/08/2019] [Indexed: 05/22/2023]
Abstract
BACKGROUND Lignocellulose biomass contains high amount of biotin and resulted in an excessive biotin condition for cellulosic glutamic acid accumulation by Corynebacterium glutamicum. Penicillin or ethambutol triggers cellulosic glutamic acid accumulation, but they are not suitable for practical use due to the fermentation instability and environmental concerns. Efficient glutamic acid production from lignocellulose feedstocks should be achieved without any chemical inductions. RESULTS An industrial strain C. glutamicum S9114 was metabolically engineered to achieve efficient glutamic acid accumulation in biotin-excessive corn stover hydrolysate. Among the multiple metabolic engineering efforts, two pathway regulations effectively triggered the glutamic acid accumulation in lignocellulose hydrolysate. The C-terminal truncation of glutamate secretion channel MscCG (ΔC110) led to the successful glutamic acid secretion in corn stover hydrolysate without inductions. Then the α-oxoglutarate dehydrogenase complex (ODHC) activity was attenuated by regulating odhA RBS sequence, and glutamic acid accumulation was further elevated for more than fivefolds. The obtained C. glutamicum XW6 strain reached a record-high titer of 65.2 g/L with the overall yield of 0.63 g/g glucose using corn stover as the starting feedstock without any chemical induction. CONCLUSIONS Metabolic engineering method was successfully applied to achieve efficient glutamic acid in biotin-rich lignocellulose hydrolysate for the first time. This study demonstrated the high potential of glutamic acid production from lignocellulose feedstock.
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Affiliation(s)
- Jingbai Wen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China
| | - Jie Bao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China
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Abstract
Glutamate (Glu) is the most abundant amino acid (AA) in human milk. Available information on Glu supply and metabolism was reviewed, based on an electronic literature search. In 22 cross-sectional global studies with 4,747 women, free Glu increases with lactation duration and contributes to about 38% of total and 63% of dispensable milk AA. Based on these data, a typical breastfed infant obtains a mean free Glu intake of 35.7 mg/kg body weight (bw; upper end of the normal range 134.6 mg/kg), while precisely collected longitudinal data indicate mean intakes of 40 mg/kg and upper range intakes of 70.2 mg/kg. Mean intakes with cows' milk formula at median concentrations are 0.7 mg/kg (upper range 1.0 mg/kg) and with extensive protein hydrolysate formula 171.7 mg/kg bw (upper range 249.8 mg/kg bw), with no indication of untoward effects. Infants almost entirely utilize dietary Glu in splanchnic organs, with no appreciable effect on plasma Glu concentrations. Estimated free Glu intakes in breastfed infants are up to 4.5-fold higher than the acceptable daily intake (ADI) set by the European Food Safety Authority for the total population including infants, and the respective intakes of infants fed a formula based on an extensive protein hydrolysate are up to 8.3-fold higher. There is no reason to assume that feeding human milk or an extensive protein hydrolysate infant formula would be unsuitable or unsafe for infants. Setting an ADI below the range of the normal intake with a safe diet in generally healthy individuals, that is, below 250 mg/kg per day, seems inappropriate.
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Affiliation(s)
- Berthold Koletzko
- Ludwig-Maximilians-University Munich, Dr. von Hauner Children's Hospital, University of Munich Medical Center, Munich, Germany,
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Fernstrom JD. Monosodium Glutamate in the Diet Does Not Raise Brain Glutamate Concentrations or Disrupt Brain Functions. Ann Nutr Metab 2018; 73 Suppl 5:43-52. [PMID: 30508818 DOI: 10.1159/000494782] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The non-essential amino acid glutamate participates in numerous metabolic pathways in the body. It also performs important physiologic functions, which include a sensory role as one of the basic tastes (as monosodium glutamate [MSG]), and a role in neuronal function as the dominant excitatory neurotransmitter in the central nervous system. Its pleasant taste (as MSG) has led to its inclusion as a flavoring agent in foods for centuries. Glutamate's neurotransmitter role was discovered only in the last 60 years. Its inclusion in foods has necessitated its safety evaluation, which has raised concerns about its transfer into the blood ultimately increasing brain glutamate levels, thereby causing functional disruptions because it is a neurotransmitter. This concern, originally raised almost 50 years ago, has led to an extensive series of scientific studies to examine this issue, conducted primarily in rodents, non-human primates, and humans. The key findings have been that (a) the ingestion of MSG in the diet does not produce appreciable increases in glutamate concentrations in blood, except when given experimentally in amounts vastly in excess of normal intake levels; and (b) the blood-brain barrier effectively restricts the passage of glutamate from the blood into the brain, such that brain glutamate levels only rise when blood glutamate concentrations are raised experimentally via non-physiologic means. These and related discoveries explain why the ingestion of MSG in the diet does not lead to an increase in brain glutamate concentrations, and thus does not produce functional disruptions in brain. This article briefly summarizes key experimental findings that evaluate whether MSG in the diet poses a threat to brain function.
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Affiliation(s)
- John D Fernstrom
- Department of Psychiatry, Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA,
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Choi YJ, Lee HW, Yang JH, Hong SW, Park SH, Lee MA. Changes in quality properties of kimchi based on the nitrogen content of fermented anchovy sauce, Myeolchi Aekjeot, during fermentation. Food Sci Biotechnol 2018; 27:1145-55. [PMID: 30263845 DOI: 10.1007/s10068-018-0349-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 02/25/2018] [Accepted: 03/01/2018] [Indexed: 10/17/2022] Open
Abstract
This study was conducted to examine the effects of the total nitrogen (TN) concentration in anchovy sauce added to kimchi on chemical properties during kimchi fermentation for 56 days. Kimchi was assigned to one of the following five treatments: CTL (No anchovy sauce addition), T-1 (TN 1.16% anchovy sauce), T-2 (TN 1.41% anchovy sauce), T-3 (TN 1.59% anchovy sauce), T-4 (TN 1.79% anchovy sauce). The quality characteristics of kimchi were determined by measuring the pH, acidity, reducing sugar, volatile basic nitrogen (VBN), amino nitrogen (AN), and microbial composition. During fermentation, the acidity of all treatment groups increased, whereas the reducing sugar content decreased gradually during fermentation. There were no significant differences in pH and acidity or reducing sugar content. The VBN and AN contents increased during fermentation from 15.65 to 31.21%. Overall, these results demonstrate that the TN concentration of anchovy mainly affects the VBN and AN levels in kimchi.
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Yang C, Song W, Zhang D, Yu H, Yin L, Shen N, Deng M, Tang Z, Gu J, Chen X. Poly (l- glutamic acid)-g-methoxy poly (ethylene glycol)-gemcitabine conjugate improves the anticancer efficacy of gemcitabine. Int J Pharm 2018; 550:79-88. [PMID: 30138704 DOI: 10.1016/j.ijpharm.2018.08.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Revised: 07/28/2018] [Accepted: 08/18/2018] [Indexed: 02/06/2023]
Abstract
Gemcitabine is widely used for anticancer therapy. However, its short blood circulation time and poor stability greatly impair its application. To solve this problem, we prepared a poly (l-glutamic acid)-g-methoxy poly (ethylene glycol)-gemcitabine conjugate (l-Gem) with a 14.3 wt% drug-loading content. l-Gem showed concentration- and time-dependent cytotoxicity towards 4T1, LLC, MIA PaCa-2 and A2780 in vitro. Pharmacokinetic and biodistribution studies indicated that l-Gem had remarkably enhanced blood stability, prolonged blood circulation time and greatly improved selective tumor distribution compared with free gemcitabine. The area under the concentration-time curve from zero to infinity [AUC(0-∞)] of l-Gem in plasma was 43-fold higher than that of free gemcitabine. The AUC(0-∞) of the inactive metabolite, 2'-deoxy-2',2'-difluorouridine in the l-Gem group was ∼20% of that observed in the free gemcitabine group. The drug tumor accumulation ratio in the l-Gem group relative to the free gemcitabine group was 9.9 at 36 h, while the tumor AUC ratio was 15.8. Testing on Balb/C mice bearing the 4T1 tumor further demonstrated that l-Gem had significantly higher anticancer efficacy than free gemcitabine in vivo. These findings indicated that l-Gem has great potential for cancer treatment.
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Baskaran R, Bandikari R, Zuo W, Qian J, Liu Z. Enhanced thermostability of halo-tolerant glutaminase from Bacillus licheniformis ATCC 14580 by immobilization onto nano magnetic cellulose sheet and its application in production of glutamic acid. Int J Biol Macromol 2018; 119:1256-1263. [PMID: 30096399 DOI: 10.1016/j.ijbiomac.2018.08.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 08/05/2018] [Accepted: 08/07/2018] [Indexed: 11/30/2022]
Abstract
A halo-tolerant glutaminase gene (BlglsA) was isolated from Bacillus licheniformis. Heterologous expression of BlglsA revealed that it encodes for a 36 kDa protein containing 327 amino acid residues. The purified enzyme showed optimal activity at a pH of 9.5 while 35 °C was found to be the optimum temperature. The enzyme retained about 92 and 97% stability at pH 12 and temperature (40 °C) respectively. Subsequent immobilization of BlglsA on nano magnetic cellulose sheet (NMCS) led to an enhanced tolerance to higher temperature. NMCS-BlglsA showed optimum activity at 45 °C, although it was stable even at 60 °C. NaCl tolerance (≥90% in 0.3 M) was almost similar to BlglsA and NMCS-BlglsA. The metal ions Fe2+ (5 mM) and Mn2+ (2.5 mM) improved the BlglsA relative activity by 61 and 48%, respectively. In contrast, 5 mM Mn2+ was found suitable to enhance the activity of NMCS-BlglsA up to 72%. The production of glutamic acid by NMCS-BlglsA was 1.61 g/l in 48 h. Reusability test of NMCS-BlglsA showed 76 and 35% retention of the actual activity after 4th and 7th cycle, respectively. Such remarkable biochemical properties of NMCS-BlglsA make it an attractive enzyme for food industries.
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Affiliation(s)
- Ram Baskaran
- College of Life Science and Technology, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China.
| | - Ramesh Bandikari
- College of Life Science and Technology, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Wu Zuo
- CAS Center for Excellence on Molecular Cell Science, Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, China
| | - Jiaxin Qian
- College of Life Science and Technology, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Ziduo Liu
- College of Life Science and Technology, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China.
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