1
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Sawasato K, Bogdanov M. The unusual substrate specificity of Escherichia coli cardiolipin synthase C does not require the product of the transcriptionally engaged ymdB gene. Biochim Biophys Acta Mol Cell Biol Lipids 2024; 1869:159483. [PMID: 38527666 DOI: 10.1016/j.bbalip.2024.159483] [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: 02/01/2024] [Revised: 02/21/2024] [Accepted: 03/19/2024] [Indexed: 03/27/2024]
Abstract
Polycistronic transcription and translation of ymdB-clsC have been thought to be required for full activity of ClsC. The authentic initiation codon of the clsC gene is present within the open reading frame of the upstream located ymdB gene. ClsC translated from authentic initiation codon drives cardiolipin (CL) synthesis without transcriptionally paired YmdB. YmdB is not necessary for the substrate specificity of ClsC utilizing phosphatidylethanolamine (PE) as a co-substrate.
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Affiliation(s)
- Katsuhiro Sawasato
- Department of Biochemistry and Molecular Biology, the University of Texas Health Science Center, McGovern Medical School, Houston, TX 77030, USA.
| | - Mikhail Bogdanov
- Department of Biochemistry and Molecular Biology, the University of Texas Health Science Center, McGovern Medical School, Houston, TX 77030, USA.
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2
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Burgac E, Kaplan İ, Köseci B, Kara E, Kor D, Bulut FD, Atmış A, Pişkin F, Tuğ Bozdoğan S, Urel Demir G, İncecik F, Önenli Mungan N. Early diagnostic clues of mucolipidosis type II: Significance of radiological findings. Am J Med Genet A 2024; 194:e63545. [PMID: 38264826 DOI: 10.1002/ajmg.a.63545] [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: 07/10/2023] [Revised: 12/11/2023] [Accepted: 01/15/2024] [Indexed: 01/25/2024]
Abstract
Mucolipidosis type-II (ML-II) is an ultra-rare disorder caused by deficiency of N-acetylglucosaminyl-1-phosphotransferase enzyme due to biallelic pathogenic variants in GNPTAB gene. There are a few known about the natural history of ML-II. In this study, we presented the natural course of 24 patients diagnosed with ML-II. Mean age at diagnosis was 9.3 ± 5.7 months. All patients had coarse face, developmental delay, and hypotonia. The mean survival time was 3.01 ± 1.4 years. The oldest patient was 6.5 years old. Twelve patients died due to lung infection and respiratory failure. We observed early and significant radiological findings of ML-II were different from typical dysostosis multiplex such as femoral cloaking, rickets-like changes, and talocalcaneal stippling. These are significant findings observed in the fetal or newborn period which is considered to be highly characteristic of ML-II and disappears in the first year. Cloaking, rickets-like changes, and stippling were not observed in patients older than three months of age and this suggests that these findings disappear within the first year. These radiological features can be used as important clues for diagnosis. We detected eight different pathogenic variants in GNPTAB gene, three of them were novel.
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Affiliation(s)
- Ezgi Burgac
- Pediatric Metabolism and Nutrition Department, Cukurova University, Adana, Turkey
| | - İrem Kaplan
- Pediatric Metabolism and Nutrition Department, Cukurova University, Adana, Turkey
| | - Burcu Köseci
- Pediatric Metabolism and Nutrition Department, Cukurova University, Adana, Turkey
| | - Esra Kara
- Pediatric Metabolism and Nutrition Department, Cukurova University, Adana, Turkey
| | - Deniz Kor
- Pediatric Metabolism and Nutrition Department, Cukurova University, Adana, Turkey
| | - Fatma Derya Bulut
- Pediatric Metabolism and Nutrition Department, Cukurova University, Adana, Turkey
| | - Anıl Atmış
- Pediatric Cardiology Department, Cukurova University, Adana, Turkey
| | | | | | - Gizem Urel Demir
- Pediatric Genetics Department, Hacettepe University, Ankara, Turkey
| | - Faruk İncecik
- Pediatric Neurology Department, Cukurova University, Adana, Turkey
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3
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Zhou N, Zhao Q, Li R, Cheng R, Wu Q, Cheng J, Chen Y. Mutation in mitral valve prolapse susceptible gene DCHS1 causes familial mitral annular disjunction. J Med Genet 2024; 61:125-131. [PMID: 37399314 DOI: 10.1136/jmg-2023-109278] [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: 03/14/2023] [Accepted: 06/18/2023] [Indexed: 07/05/2023]
Abstract
BACKGROUND Mitral annular disjunction (MAD) is an under-recognised phenotype associated with severe ventricular arrhythmias. Limited knowledge has been gained on its molecular genesis. METHODS A total of 150 unrelated deceased Chinese were collected for whole-exome sequencing, with analysis focusing on a panel of 118 genes associated with 'abnormal mitral valve morphology'. Cases were prespecified as 'longitudinally extensive MAD (LE-MAD)' or 'longitudinally less-extensive MAD (LLE-MAD)' according to the gross disjunctional length with a cut-off of 4.0 mm. The pedigree investigation was conducted on a case carrying an ultra-rare (minor allele frequency <0.1%) deleterious variant in DCHS1. RESULTS Seventy-seven ultra-rare deleterious variants were finally identified. Exclusively, 12 ultra-rare deleterious variants distributed in nine genes occurred in LE-MAD, which were ANK1, COL3A1, DCHS1, FBN2, GNPTAB, LZTR1, PLD1, RYR1 and VPS13B. Ultra-rare deleterious variants in those nine genes were predominantly distributed in LE-MAD compared with LLE-MAD (28% vs 5%, OR 7.30, 95% CI 2.33 to 23.38; p<0.001), and the only gene related to LE-MAD with borderline significance was DCHS1. LE-MAD was consistently observed in a sizeable Chinese family, in which LE-MAD independently co-segregated with an ultra-rare deleterious variant in DCHS1, rs145429962. CONCLUSION This study initially proposed that isolated LE-MAD might be a particular phenotype of MAD with a complex genetic predisposition. Deleterious variants in DCHS1 might be associated with the morphogenesis of LE-MAD.
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Affiliation(s)
- Nan Zhou
- Department of Forensic Pathology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Guangdong Province Translational Forensic Medicine Engineering Technology Research Center, Sun Yat-Sen University, Guangzhou, Guangdong, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdong, China
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdong, China
- Guangzhou Key Laboratory of Molecular Mechanisms and Translation in Major Cardiovascular Disease, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Qianhao Zhao
- Department of Forensic Pathology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Guangdong Province Translational Forensic Medicine Engineering Technology Research Center, Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - Rui Li
- Department of Forensic Pathology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Guangdong Province Translational Forensic Medicine Engineering Technology Research Center, Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - Ruofei Cheng
- Department of Forensic Pathology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Guangdong Province Translational Forensic Medicine Engineering Technology Research Center, Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - Qiuping Wu
- Department of Pathology, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Jianding Cheng
- Department of Forensic Pathology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
- Guangdong Province Translational Forensic Medicine Engineering Technology Research Center, Sun Yat-Sen University, Guangzhou, Guangdong, China
| | - Yangxin Chen
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdong, China
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Sun Yat-Sen Memorial Hospital, Guangzhou, Guangdong, China
- Guangzhou Key Laboratory of Molecular Mechanisms and Translation in Major Cardiovascular Disease, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
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4
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Suzuki R, Murakami C, Dilimulati K, Atsuta-Tsunoda K, Kawai T, Sakane F. Human sphingomyelin synthase 1 generates diacylglycerol in the presence and absence of ceramide via multiple enzymatic activities. FEBS Lett 2023; 597:2672-2686. [PMID: 37715942 DOI: 10.1002/1873-3468.14735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 08/24/2023] [Accepted: 09/01/2023] [Indexed: 09/18/2023]
Abstract
Sphingomyelin (SM) synthase 1 (SMS1), which is involved in lipodystrophy, deafness, and thrombasthenia, generates diacylglycerol (DG) and SM using phosphatidylcholine (PC) and ceramide as substrates. Here, we found that SMS1 possesses DG-generating activities via hydrolysis of PC and phosphatidylethanolamine (PE) in the absence of ceramide and ceramide phosphoethanolamine synthase (CPES) activity. In the presence of the same concentration (4.7 mol%) of PC and ceramide, the amounts of DG produced by SMS and PC-phospholipase C (PLC) activities of SMS1 were approximately 65% and 35% of total DG production, respectively. PC-PLC activity showed substrate selectivity for saturated and/or monounsaturated fatty acid-containing PC species. A PC-PLC/SMS inhibitor, D609, inhibited only SMS activity. Mn2+ inhibited only PC-PLC activity. Intriguingly, DG attenuated SMS/CPES activities. Our study indicates that SMS1 is a unique enzyme with PC-PLC/PE-PLC/SMS/CPES activities.
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Affiliation(s)
- Rika Suzuki
- Department of Chemistry, Graduate School of Science, Chiba University, Japan
| | - Chiaki Murakami
- Department of Chemistry, Graduate School of Science, Chiba University, Japan
- Institute for Advanced Academic Research, Chiba University, Japan
| | - Kamila Dilimulati
- Department of Chemistry, Graduate School of Science, Chiba University, Japan
| | | | - Takuma Kawai
- Department of Chemistry, Graduate School of Science, Chiba University, Japan
| | - Fumio Sakane
- Department of Chemistry, Graduate School of Science, Chiba University, Japan
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5
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Chiang YP, Li Z, He M, Jones Q, Pan M, Han X, Jiang XC. Sphingomyelin synthase-related protein SMSr is a phosphatidylethanolamine phospholipase C that promotes nonalcoholic fatty liver disease. J Biol Chem 2023; 299:105162. [PMID: 37586586 PMCID: PMC10494463 DOI: 10.1016/j.jbc.2023.105162] [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: 05/15/2023] [Revised: 07/28/2023] [Accepted: 08/04/2023] [Indexed: 08/18/2023] Open
Abstract
Sphingomyelin synthase (SMS)-related protein (SMSr) is a phosphatidylethanolamine phospholipase C (PE-PLC) that is conserved and ubiquitous in mammals. However, its biological function is still not clear. We previously observed that SMS1 deficiency-mediated glucosylceramide accumulation caused nonalcoholic fatty liver diseases (NAFLD), including nonalcoholic steatohepatitis (NASH) and liver fibrosis. Here, first, we evaluated high-fat diet/fructose-induced NAFLD in Smsr KO and WT mice. Second, we evaluated whether SMSr deficiency can reverse SMS1 deficiency-mediated NAFLD, using Sms1/Sms2 double and Sms1/Sms2/Smsr triple KO mice. We found that SMSr/PE-PLC deficiency attenuated high-fat diet/fructose-induced fatty liver and NASH, and attenuated glucosylceramide accumulation-induced NASH, fibrosis, and tumor formation. Further, we found that SMSr/PE-PLC deficiency reduced the expression of many inflammatory cytokines and fibrosis-related factors, and PE supplementation in vitro or in vivo mimicked the condition of SMSr/PE-PLC deficiency. Furthermore, we demonstrated that SMSr/PE-PLC deficiency or PE supplementation effectively prevented membrane-bound β-catenin transfer to the nucleus, thereby preventing tumor-related gene expression. Finally, we observed that patients with NASH had higher SMSr protein levels in the liver, lower plasma PE levels, and lower plasma PE/phosphatidylcholine ratios, and that human plasma PE levels are negatively associated with tumor necrosis factor-α and transforming growth factor β1 levels. In conclusion, SMSr/PE-PLC deficiency causes PE accumulation, which can attenuate fatty liver, NASH, and fibrosis. These results suggest that SMSr/PE-PLC inhibition therapy may mitigate NAFLD.
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Affiliation(s)
- Yeun-Po Chiang
- Department of Cell Biology, SUNY Downstate Health Sciences University, Brooklyn, New York, USA
| | - Zhiqiang Li
- Department of Cell Biology, SUNY Downstate Health Sciences University, Brooklyn, New York, USA
| | - Mulin He
- Department of Cell Biology, SUNY Downstate Health Sciences University, Brooklyn, New York, USA
| | - Quiana Jones
- Department of Cell Biology, SUNY Downstate Health Sciences University, Brooklyn, New York, USA
| | - Meixia Pan
- Lipidomics Core, The University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Xianlin Han
- Lipidomics Core, The University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Xian-Cheng Jiang
- Department of Cell Biology, SUNY Downstate Health Sciences University, Brooklyn, New York, USA; Molecular and Cellular Cardiology Program, VA New York Harbor Healthcare System, Brooklyn, New York, USA.
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6
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Sphingomyelin synthase 2 foci determine sites of migrasome formation. Nat Cell Biol 2023; 25:1087-8. [PMID: 37488438 DOI: 10.1038/s41556-023-01199-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
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7
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Liang H, Ma X, Zhang Y, Liu Y, Liu N, Zhang W, Chen J, Liu B, Du W, Liu X, Yu L. The formation of migrasomes is initiated by the assembly of sphingomyelin synthase 2 foci at the leading edge of migrating cells. Nat Cell Biol 2023; 25:1173-1184. [PMID: 37488437 DOI: 10.1038/s41556-023-01188-8] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 06/09/2023] [Indexed: 07/26/2023]
Abstract
The migrasome is an organelle of migrating cells with diverse physiological functions. How migrasome formation is initiated is unknown. We found that sphingomyelin is enriched in migrasomes and identified sphingomyelin synthase 2 (SMS2) as an essential protein for migrasome biogenesis. SMS2 assembles into immobile foci that adhere on the basal membrane at the leading edge. When cells migrate away, the SMS2 foci 'move' out of cells and into retraction fibres, where they become migrasome formation sites and eventually grow into migrasomes. Mechanistically, SMS2 foci seed migrasomes by converting ceramide to sphingomyelin, which is essential for migrasome formation. Furthermore, CerS5, which is required for the synthesis of long-chain ceramide, and CERT, which transports ceramide from the endoplasmic reticulum to Golgi, are both required for migrasome formation. Our data reveal the essential role of ceramide and sphingomyelin in migrasome formation and suggest that SMS2 forms basal membrane-surface-connecting structures that pre-determine where migrasomes will grow.
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Affiliation(s)
- Haisha Liang
- The State Key Laboratory of Membrane Biology, Tsinghua University-Peking University Joint Center for Life Sciences, Beijing Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, China
| | - Xinyu Ma
- The State Key Laboratory of Membrane Biology, Tsinghua University-Peking University Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China
| | - Yuanyuan Zhang
- School of Pharmaceutical Sciences, Tsinghua University, Beijing, China
| | - Yuheng Liu
- The State Key Laboratory of Membrane Biology, Tsinghua University-Peking University Joint Center for Life Sciences, Beijing Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, China
| | - Nan Liu
- MOE Key Laboratory of Protein Sciences, Beijing Frontier Research Center for Biological Structures, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Weiying Zhang
- School of Life Science, Tsinghua University, Beijing, China
| | - Jianhui Chen
- School of Life Science, Tsinghua University, Beijing, China
| | - Boqi Liu
- The State Key Laboratory of Membrane Biology, Tsinghua University-Peking University Joint Center for Life Sciences, Beijing Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, China
| | - Wanqing Du
- The State Key Laboratory of Membrane Biology, Tsinghua University-Peking University Joint Center for Life Sciences, Beijing Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, China
| | - Xiaohui Liu
- Technology Center for Protein Sciences, Tsinghua University, Beijing, China
| | - Li Yu
- The State Key Laboratory of Membrane Biology, Tsinghua University-Peking University Joint Center for Life Sciences, Beijing Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, China.
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8
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Ohta K, Shimizu T, Oshima T, Ichihashi N. Genetic analysis of Bacillus subtilis stable L-forms obtained via long-term cultivation. J GEN APPL MICROBIOL 2023; 69:45-52. [PMID: 36384691 DOI: 10.2323/jgam.2022.10.003] [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] [Indexed: 03/27/2024]
Abstract
Various bacteria can change to a spherical cell-wall-deficient state, called L-from, in the presence of antibiotics that inhibit cell wall synthesis. L-forms are classified into two types: unstable and stable L-forms. Unstable L-forms revert to a normal walled state in the absence of antibiotics, while stable L-forms remain in their wall-deficient state. The conversion from unstable to stable L-forms has been often observed during long-term cultivation. However, the genetic cause for this conversion is not yet fully understood. Here, we obtained stable Bacillus subtilis L-form strains from unstable L-form strains via three independent long-term culturing experiments. The whole genome sequencing of the long-cultured strains identified many mutations, and some mutations were commonly found in all three long-cultured strains. The knockout strain of one of the commonly mutated genes, tagF, in the ancestral strain lost the ability to revert to walled state (rod shape), supporting that eliminating the function of tagF gene is one of the possible methods to convert unstable L forms to a stable state.
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Affiliation(s)
- Kazuki Ohta
- Department of Life Science, Graduate School of Arts and Science, The University of Tokyo
| | - Tenma Shimizu
- Graduate School of Frontier Biosciences, Osaka University
| | - Taku Oshima
- Department of Biotechnology, Toyama Prefectural University
| | - Norikazu Ichihashi
- Department of Life Science, Graduate School of Arts and Science, The University of Tokyo
- Komaba Institute for Science, The University of Tokyo
- Universal Biology Institute, Graduate School of Science, The University of Tokyo
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9
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Honma N, Hatta I, Okazaki T, Tokudome Y. Modulation of function and structure of stratum corneum in sphingomyelin synthase 2-deficient mice. Chem Phys Lipids 2022; 249:105255. [PMID: 36279928 DOI: 10.1016/j.chemphyslip.2022.105255] [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: 07/15/2022] [Revised: 09/22/2022] [Accepted: 10/17/2022] [Indexed: 01/25/2023]
Abstract
Sphingomyelin synthase (SMS) synthesizes sphingomyelin (SM) from ceramide (Cer), a precursor of Cer. The effects of SMS deficiency on stratum corneum (SC) barrier function and SC lamellar structure are unknown. In this report, permeation of hydrophilic and lipophilic compounds through full-thickness skin or stripped skin of SMS2-knockout (KO) and wild-type (WT) mice was examined. Furthermore, small-angle and wide-angle X-ray scattering (SAXS and WAXS) measurements of the SC were performed as a function of temperature to analyze the lamellar structure and hydrocarbon chain packing, where a SC sample was changed from 10 °C to 120 °C at 2 °C/min and the X-ray diffraction profile in the small-angle region and the wide-angle region was observed. Skin permeability of the hydrophilic compound increased significantly for SMS2-KO mice when compared with that of WT mice. In contrast, no difference was observed in the penetration of lipophilic compounds in the skin of both SMS2-KO and WT mice. In SC of SMS2-KO mice, two sharp SAXS peaks were observed due to the lamellar structure with a repetition period of 4.8 nm. The WAXS revealed that the intensity ratio R0.42/0.37 of the 0.42 nm peak at 2.4 nm-1 to the 0.37 nm peak at 2.7 nm-1 was smaller in the SMS2-KO mouse than in the WT mouse. Due to the temperature dependence of the WAXS, the peaks of 2.4 and 2.7 nm-1 remained until the higher temperatures in SMS2-KO mouse SC than those in WT mouse SC. The results of X-ray diffraction suggest that deficiency of SMS2 may cause the appearance of highly ordered structures of SC, which in turn may reduce the barrier function of SC.
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Affiliation(s)
- Nozomi Honma
- Faculty of Pharmacy and Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan
| | - Ichiro Hatta
- Department of Research, Nagoya Industrial Science Research Institute, 1-13 Yotsuyadori, Chikusa-ku, Nagoya 464-0819, Japan
| | - Toshiro Okazaki
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, 1-308 Suematsu, Nonoichi, Ishikawa 921-8836, Japan
| | - Yoshihiro Tokudome
- Faculty of Pharmacy and Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan; Laboratory of Cosmetic Sciences, Regional Innovation Center, Saga University, 1 Honjo, Saga 840-8502, Japan.
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10
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Zhang W, Yang X, Li Y, Yu L, Zhang B, Zhang J, Cho WJ, Venkatarangan V, Chen L, Burugula BB, Bui S, Wang Y, Duan C, Kitzman JO, Li M. GCAF(TMEM251) regulates lysosome biogenesis by activating the mannose-6-phosphate pathway. Nat Commun 2022; 13:5351. [PMID: 36096887 PMCID: PMC9468337 DOI: 10.1038/s41467-022-33025-1] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 08/29/2022] [Indexed: 11/09/2022] Open
Abstract
The mannose-6-phosphate (M6P) biosynthetic pathway for lysosome biogenesis has been studied for decades and is considered a well-understood topic. However, whether this pathway is regulated remains an open question. In a genome-wide CRISPR/Cas9 knockout screen, we discover TMEM251 as the first regulator of the M6P modification. Deleting TMEM251 causes mistargeting of most lysosomal enzymes due to their loss of M6P modification and accumulation of numerous undigested materials. We further demonstrate that TMEM251 localizes to the Golgi and is required for the cleavage and activity of GNPT, the enzyme that catalyzes M6P modification. In zebrafish, TMEM251 deletion leads to severe developmental defects including heart edema and skeletal dysplasia, which phenocopies Mucolipidosis Type II. Our discovery provides a mechanism for the newly discovered human disease caused by TMEM251 mutations. We name TMEM251 as GNPTAB cleavage and activity factor (GCAF) and its related disease as Mucolipidosis Type V.
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Affiliation(s)
- Weichao Zhang
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Xi Yang
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Yingxiang Li
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Linchen Yu
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Bokai Zhang
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Jianchao Zhang
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Woo Jung Cho
- BRCF Microscopy Core, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Varsha Venkatarangan
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Liang Chen
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Bala Bharathi Burugula
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Sarah Bui
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Yanzhuang Wang
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Cunming Duan
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Jacob O Kitzman
- Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Ming Li
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA.
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11
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Gorelik A, Illes K, Bui KH, Nagar B. Structures of the mannose-6-phosphate pathway enzyme, GlcNAc-1-phosphotransferase. Proc Natl Acad Sci U S A 2022; 119:e2203518119. [PMID: 35939698 PMCID: PMC9388126 DOI: 10.1073/pnas.2203518119] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Accepted: 05/06/2022] [Indexed: 11/18/2022] Open
Abstract
The mannose-6-phosphate (M6P) pathway is responsible for the transport of hydrolytic enzymes to lysosomes. N-acetylglucosamine-1-phosphotransferase (GNPT) catalyzes the first step of tagging these hydrolases with M6P, which when recognized by receptors in the Golgi diverts them to lysosomes. Genetic defects in the GNPT subunits, GNPTAB and GNPTG, cause the lysosomal storage diseases mucolipidosis types II and III. To better understand its function, we determined partial three-dimensional structures of the GNPT complex. The catalytic domain contains a deep cavity for binding of uridine diphosphate-N-acetylglucosamine, and the surrounding residues point to a one-step transfer mechanism. An isolated structure of the gamma subunit of GNPT reveals that it can bind to mannose-containing glycans in different configurations, suggesting that it may play a role in directing glycans into the active site. These findings may facilitate the development of therapies for lysosomal storage diseases.
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Affiliation(s)
- Alexei Gorelik
- Department of Biochemistry, McGill University, Montreal, QC H3G 0B1, Canada
- Department of Anatomy and Cell Biology, McGill University, Montreal, QC H3A 0C7, Canada
| | - Katalin Illes
- Department of Biochemistry, McGill University, Montreal, QC H3G 0B1, Canada
| | - Khanh Huy Bui
- Department of Anatomy and Cell Biology, McGill University, Montreal, QC H3A 0C7, Canada
| | - Bhushan Nagar
- Department of Biochemistry, McGill University, Montreal, QC H3G 0B1, Canada
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Chen YC, Hu Z, Zhang WB, Yin Y, Zhong CY, Mo WY, Yu YH, Ma JC, Wang HH. HetI-Like Phosphopantetheinyl Transferase Posttranslationally Modifies Acyl Carrier Proteins in Xanthomonas spp. Mol Plant Microbe Interact 2022; 35:323-335. [PMID: 35286156 DOI: 10.1094/mpmi-10-21-0249-r] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In Xanthomonas spp., the biosynthesis of the yellow pigment xanthomonadin and fatty acids originates in the type II polyketide synthase (PKS II) and fatty acid synthase (FAS) pathways, respectively. The acyl carrier protein (ACP) is the central component of PKS II and FAS and requires posttranslational phosphopantetheinylation to initiate these pathways. In this study, for the first time, we demonstrate that the posttranslational modification of ACPs in X. campestris pv. campestris is performed by an essential 4'-phosphopantetheinyl transferase (PPTase), XcHetI (encoded by Xc_4132). X. campestris pv. campestris strain XchetI could not be deleted from the X. campestris pv. campestris genome unless another PPTase-encoding gene such as Escherichia coli acpS or Pseudomonas aeruginosa pcpS was present. Compared with wild-type strain X. campestris pv. campestris 8004 and mutant XchetI::PapcpS, strain XchetI::EcacpS failed to generate xanthomonadin pigments and displayed reduced pathogenicity for the host plant, Brassica oleracea. Further experiments showed that the expression of XchetI restored the growth of E. coli acpS mutant HT253 and, when a plasmid bearing XchetI was introduced into P. aeruginosa, pcpS, which encodes the sole PPTase in P. aeruginosa, could be deleted. In in vitro enzymatic assays, XcHetI catalyzed the transformation of 4'-phosphopantetheine from coenzyme A to two X. campestris pv. campestris apo-acyl carrier proteins, XcAcpP and XcAcpC. All of these findings indicate that XcHetI is a surfactin PPTase-like PPTase with a broad substrate preference. Moreover, the HetI-like PPTase is ubiquitously conserved in Xanthomonas spp., making it a potential new drug target for the prevention of plant diseases caused by Xanthomonas.[Formula: see text] Copyright © 2022 The Author(s). This is an open access article distributed under the CC BY 4.0 International license.
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Affiliation(s)
- Yi-Cai Chen
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Zhe Hu
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Wen-Bin Zhang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Yu Yin
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Can-Yao Zhong
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Wan-Ying Mo
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Yong-Hong Yu
- Guangdong Food and Drug Vocational College, Guangzhou, Guangdong 510520, China
| | - Jin-Cheng Ma
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Hai-Hong Wang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, Guangdong 510642, China
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Pedersen TB, Nielsen MR, Kristensen SB, Spedtsberg EML, Sørensen T, Petersen C, Muff J, Sondergaard TE, Nielsen KL, Wimmer R, Gardiner DM, Sørensen JL. Speed dating for enzymes! Finding the perfect phosphopantetheinyl transferase partner for your polyketide synthase. Microb Cell Fact 2022; 21:9. [PMID: 35012550 PMCID: PMC8751348 DOI: 10.1186/s12934-021-01734-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 12/29/2021] [Indexed: 11/24/2022] Open
Abstract
The biosynthetic pathways for the fungal polyketides bikaverin and bostrycoidin, from Fusarium verticillioides and Fusarium solani respectively, were reconstructed and heterologously expressed in S. cerevisiae alongside seven different phosphopantetheinyl transferases (PPTases) from a variety of origins spanning bacterial, yeast and fungal origins. In order to gauge the efficiency of the interaction between the ACP-domains of the polyketide synthases (PKS) and PPTases, each were co-expressed individually and the resulting production of target polyketides were determined after 48 h of growth. In co-expression with both biosynthetic pathways, the PPTase from Fusarium verticillioides (FvPPT1) proved most efficient at producing both bikaverin and bostrycoidin, at 1.4 mg/L and 5.9 mg/L respectively. Furthermore, the remaining PPTases showed the ability to interact with both PKS's, except for a single PKS-PPTase combination. The results indicate that it is possible to boost the production of a target polyketide, simply by utilizing a more optimal PPTase partner, instead of the commonly used PPTases; NpgA, Gsp and Sfp, from Aspergillus nidulans, Brevibacillus brevis and Bacillus subtilis respectively.
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Affiliation(s)
- Tobias Bruun Pedersen
- Department of Chemistry and Bioscience, Aalborg University Esbjerg, Niels Bohrs Vej 8, 6700, Esbjerg, Denmark
| | - Mikkel Rank Nielsen
- Department of Chemistry and Bioscience, Aalborg University Esbjerg, Niels Bohrs Vej 8, 6700, Esbjerg, Denmark
| | | | - Eva Mie Lang Spedtsberg
- Department of Chemistry and Bioscience, Aalborg University Esbjerg, Niels Bohrs Vej 8, 6700, Esbjerg, Denmark
| | - Trine Sørensen
- Department of Chemistry and Bioscience, Aalborg University Aalborg, Fredrik Bajers Vej 7H, 9220, Aalborg, Denmark
| | - Celine Petersen
- Department of Chemistry and Bioscience, Aalborg University Aalborg, Fredrik Bajers Vej 7H, 9220, Aalborg, Denmark
| | - Jens Muff
- Department of Chemistry and Bioscience, Aalborg University Esbjerg, Niels Bohrs Vej 8, 6700, Esbjerg, Denmark
| | - Teis Esben Sondergaard
- Department of Chemistry and Bioscience, Aalborg University Aalborg, Fredrik Bajers Vej 7H, 9220, Aalborg, Denmark
| | - Kåre Lehmann Nielsen
- Department of Chemistry and Bioscience, Aalborg University Aalborg, Fredrik Bajers Vej 7H, 9220, Aalborg, Denmark
| | - Reinhard Wimmer
- Department of Chemistry and Bioscience, Aalborg University Aalborg, Fredrik Bajers Vej 7H, 9220, Aalborg, Denmark
| | - Donald Max Gardiner
- The University of Queensland, 306 Carmody Rd, St Lucia, Brisbane, QLD, 4072, Australia
| | - Jens Laurids Sørensen
- Department of Chemistry and Bioscience, Aalborg University Esbjerg, Niels Bohrs Vej 8, 6700, Esbjerg, Denmark.
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14
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Jones CV, Jarboe BG, Majer HM, Ma AT, Beld J. Escherichia coli Nissle 1917 secondary metabolism: aryl polyene biosynthesis and phosphopantetheinyl transferase crosstalk. Appl Microbiol Biotechnol 2021; 105:7785-7799. [PMID: 34546406 DOI: 10.1007/s00253-021-11546-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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 08/21/2021] [Accepted: 08/24/2021] [Indexed: 10/20/2022]
Abstract
Escherichia coli Nissle 1917 (EcN) is a Gram-negative bacterium that is used to treat inflammatory bowel diseases. The probiotic character of EcN is not well-understood, but its ability to produce secondary metabolites plays an important role in its activity. The EcN genome encodes for an aryl polyene (APE) biosynthetic gene cluster (BGC), and APE products have a role in biofilm formation. We show here that this unusual polyketide assembly line synthase produces four APE molecules which are likely cis/trans isomers. Within the APE BGC, two acyl carrier proteins are involved in biosynthesis. Acyl carrier proteins require activation by post-translational modification with a phosphopantetheinyl transferase (PPTase). Through analysis of single, double, and triple mutants of three PPTases, the PPTase-BGC crosstalk relationship in EcN was characterized. Understanding PPTase-BGC crosstalk is important for the engineering of secondary metabolite production hosts and for targeting of PPTases with new antibiotics. KEY POINTS: • Escherichia coli Nissle 1917 biosynthesizes four aryl polyene isoforms. • Phosphopantetheinyl transferase crosstalk is important for biosynthesis.
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Affiliation(s)
- Courtney V Jones
- Department of Microbiology and Immunology, Center for Advanced Microbial Processing and Center for Genomics Sciences, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, 245 N 15th St, Philadelphia, PA, 19102, USA
| | - Brianna G Jarboe
- Department of Microbiology and Immunology, Center for Advanced Microbial Processing and Center for Genomics Sciences, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, 245 N 15th St, Philadelphia, PA, 19102, USA
| | - Haley M Majer
- Department of Microbiology and Immunology, Center for Advanced Microbial Processing and Center for Genomics Sciences, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, 245 N 15th St, Philadelphia, PA, 19102, USA
| | - Amy T Ma
- Department of Microbiology and Immunology, Center for Advanced Microbial Processing and Center for Genomics Sciences, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, 245 N 15th St, Philadelphia, PA, 19102, USA
| | - Joris Beld
- Department of Microbiology and Immunology, Center for Advanced Microbial Processing and Center for Genomics Sciences, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, 245 N 15th St, Philadelphia, PA, 19102, USA.
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15
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Ou P, Stanek A, Huan Z, Roman CAJ, Huan C. SMS2 deficiency impairs PKCδ-regulated B cell tolerance in the germinal center. Cell Rep 2021; 36:109624. [PMID: 34469734 DOI: 10.1016/j.celrep.2021.109624] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 06/14/2021] [Accepted: 08/05/2021] [Indexed: 11/29/2022] Open
Abstract
B cell tolerance prevents autoimmunity by deleting or deactivating autoreactive B cells that otherwise may cause autoantibody-driven disorders, including systemic lupus erythematosus (lupus). Lupus is characterized by immunoglobulin Gs carrying a double-stranded (ds)-DNA autospecificity derived mainly from somatic hypermutation in the germinal center (GC), pointing to a checkpoint breach of GC B cell tolerance that leads to lupus. However, tolerance mechanisms in the GC remain poorly understood. Here, we show that upregulated sphingomyelin synthase 2 (SMS2) in anti-dsDNA GC B cells induces apoptosis by directly activating protein kinase C δ (PKCδ)'s pro-apoptotic activity. This tolerance mechanism prevents lupus autoimmunity in C57/BL6 mice and can be stimulated pharmacologically to inhibit lupus pathogenesis in lupus-prone NZBWF1 mice. Patients with lupus consistently have substantially reduced SMS2 expression in B cells and to an even greater extent in autoimmune-prone, age-associated B cells, suggesting that patients with lupus have insufficient SMS2-regulated B cell tolerance.
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Affiliation(s)
- Peiqi Ou
- Program in Molecular and Cellular Biology, The School of Graduate Studies, State University of New York (SUNY) Downstate Health Sciences University, Brooklyn, NY 11203, USA
| | - Albert Stanek
- Department of Surgery, State University of New York (SUNY) Downstate Health Sciences University, Brooklyn, NY 11203, USA
| | - Zack Huan
- Department of Cell Biology, State University of New York (SUNY) Downstate Health Sciences University, Brooklyn, NY 11203, USA
| | - Christopher A J Roman
- Department of Cell Biology, State University of New York (SUNY) Downstate Health Sciences University, Brooklyn, NY 11203, USA.
| | - Chongmin Huan
- Department of Surgery, State University of New York (SUNY) Downstate Health Sciences University, Brooklyn, NY 11203, USA; Department of Cell Biology, State University of New York (SUNY) Downstate Health Sciences University, Brooklyn, NY 11203, USA.
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16
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He B, Xu J, Pang S, Tang H. Phosphatidylcholine mediates the crosstalk between LET-607 and DAF-16 stress response pathways. PLoS Genet 2021; 17:e1009573. [PMID: 34014977 PMCID: PMC8172019 DOI: 10.1371/journal.pgen.1009573] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 06/02/2021] [Accepted: 05/03/2021] [Indexed: 11/19/2022] Open
Abstract
Coordinated regulation of stress response pathways is crucial for cellular homeostasis. However, crosstalk between the different stress pathways and the physiological significance of this crosstalk remain poorly understood. In this study, using the model organism C. elegans, we discovered that suppression of the transcription factor LET-607/CREBH, a regulator of cellular defense and proteostatic responses, triggers adaptive induction of DAF-16-dependent stress responses. Suppression of LET-607 improves stress resistance and extends C. elegans lifespan in a DAF-16-dependent manner. We identified the sphingomyelin synthase SMS-5 to be a central mediator in the communication between LET-607 and DAF-16. SMS-5 reduces the contents of unsaturated phosphatidylcholine (PC), which activates DAF-16 through ITR-1-dependent calcium signaling and calcium-sensitive kinase PKC-2. Our data reveal the significance of crosstalk between different stress pathways in animal fitness and identify LET-607/CREBH and specific PC as regulators of DAF-16 and longevity. In order to cope with stresses, cells have evolved complex and elegant adaptive mechanisms, which are also referred to as stress responses. Central to these responses are core transcription factors. It is widely hypothesized that interruption of one key stress response pathway could compromise overall cellular function and survival. In order to avoid such an issue, stress response pathways communicate with each other. A defect in one pathway may adaptively activate other pathways, thus restoring homeostasis and increasing fitness. However, how these pathways communicate is largely unexplored. In this study, we unraveled crosstalk between the LET-607 and DAF-16 pathways in C. elegans. Suppression of LET-607, a regulator of defense and proteostatic responses, was shown to adaptively activate DAF-16, which is a crucial regulator of general stress responses. This crosstalk was shown to be vital for animal fitness, as suppression of LET-607 extends lifespan in a DAF-16-dependent manner. Intriguingly, loss of LET-607 results in increased levels of the sphingomyelin synthase SMS-5, which metabolizes membrane lipid PC. Consequently, the reduction in PC causes activation of DAF-16 via membrane-located calcium channel ITR-1 and calcium-sensitive kinase PKC-2. This study identifies a novel crosstalk between stress response pathways, which is potentially significant in animal longevity.
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Affiliation(s)
- Bin He
- School of Life Sciences, Chongqing University, Chongqing, China
| | - Jie Xu
- School of Life Sciences, Chongqing University, Chongqing, China
| | - Shanshan Pang
- School of Life Sciences, Chongqing University, Chongqing, China
- * E-mail: (SP); (HT)
| | - Haiqing Tang
- School of Life Sciences, Chongqing University, Chongqing, China
- * E-mail: (SP); (HT)
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17
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Zayed MA, Jin X, Yang C, Belaygorod L, Engel C, Desai K, Harroun N, Saffaf O, Patterson BW, Hsu FF, Semenkovich CF. CEPT1-Mediated Phospholipogenesis Regulates Endothelial Cell Function and Ischemia-Induced Angiogenesis Through PPARα. Diabetes 2021; 70:549-561. [PMID: 33214136 PMCID: PMC7881870 DOI: 10.2337/db20-0635] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 11/12/2020] [Indexed: 11/13/2022]
Abstract
De novo phospholipogenesis, mediated by choline-ethanolamine phosphotransferase 1 (CEPT1), is essential for phospholipid activation of transcription factors such as peroxisome proliferator-activated receptor α (PPARα) in the liver. Fenofibrate, a PPARα agonist and lipid-lowering agent, decreases amputation incidence in patients with diabetes. Because we previously observed that CEPT1 is elevated in carotid plaque of patients with diabetes, we evaluated the role of CEPT1 in peripheral arteries and PPARα phosphorylation (Ser12). CEPT1 was found to be elevated in diseased lower-extremity arterial intima of individuals with peripheral arterial disease and diabetes. To evaluate the role of Cept1 in the endothelium, we engineered a conditional endothelial cell (EC)-specific deletion of Cept1 via induced VE-cadherin-CreERT2-mediated recombination (Cept1Lp/LpCre +). Cept1Lp/LpCre + ECs demonstrated decreased proliferation, migration, and tubule formation, and Cept1Lp/LpCre + mice had reduced perfusion and angiogenesis in ischemic hind limbs. Peripheral ischemic recovery and PPARα signaling were further compromised by streptozotocin-induced diabetes and ameliorated by feeding fenofibrate. Cept1 endoribonuclease-prepared siRNA decreased PPARα phosphorylation in ECs, which was rescued with fenofibrate but not PC16:0/18:1. Unlike Cept1Lp/LpCre + mice, Cept1Lp/LpCre + Ppara -/- mice did not demonstrate hind-paw perfusion recovery after feeding fenofibrate. Therefore, we demonstrate that CEPT1 is essential for EC function and tissue recovery after ischemia and that fenofibrate rescues CEPT1-mediated activation of PPARα.
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Affiliation(s)
- Mohamed A Zayed
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
- VA St. Louis Health Care System, St. Louis, MO
| | - Xiaohua Jin
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Chao Yang
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Larisa Belaygorod
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Connor Engel
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Kshitij Desai
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Nikolai Harroun
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Omar Saffaf
- Section of Vascular Surgery, Department of Surgery, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Bruce W Patterson
- Center for Human Nutrition, Department of Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Fong-Fu Hsu
- Division of Endocrinology, Metabolism and Lipid Research, Department of Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Clay F Semenkovich
- Division of Endocrinology, Metabolism and Lipid Research, Department of Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO
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18
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Doğan M, Eröz R, Terali K, Gezdirici A, Bolu S. Clinical, radiological and computational studies on two novel GNPTG variants causing mucolipidosis III gamma phenotypes with varying severity. Mol Biol Rep 2021; 48:1465-1474. [PMID: 33507475 DOI: 10.1007/s11033-021-06158-7] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 01/12/2021] [Indexed: 10/22/2022]
Abstract
Mucolipidosis III gamma (ML III γ) is a slowly progressive disorder that affects multiple parts of the body such as the skeleton, joints, and connective tissue structures. It is caused by pathogenic variants in the GNPTG gene that provides instructions for producing the γ subunit of GlcNAc-1-phosphotransferase. In this study we aim to characterize clinical findings and biological insights on two novel GNPTG variants causing ML III γ phenotypes with varying severity. We report on two siblings with ML III γ bearing the previously undescribed c.477C > G (p.Y159*) nonsense variant in a homozygous state as well as a patient with ML III γ bearing the novel c.110 + 19_111-17del variant in a homozygous state. These variants were revealed by whole-exome sequencing and Sanger sequencing, respectively. Their parents, who are heterozygotes for the same mutation, are healthy. The clinical and radiographic presentation of ML III γ in our patients who had c.477C > G (p.Y159*) variant is consistent with a relatively severe form of the disease, which is further supported by a working three-dimensional model of the GlcNAc-1-phosphotransferase γ subunit. On the other hand, it is seen that our patient who carries the c.110 + 19_111-17del variant has a milder phenotype. Our findings help broaden the spectrum of GNPTG variants causing ML III γ and offer structural and mechanistic insights into loss of GlcNAc-1-phosphotransferase γ subunit function.
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Affiliation(s)
- Mustafa Doğan
- Department of Medical Genetics, Malatya Turgut Ozal University Training and Research Hospital, Malatya, Turkey.
| | - Recep Eröz
- Department of Medical Genetics, Faculty of Medicine, Düzce University, Düzce, Turkey
| | - Kerem Terali
- Department of Medical Biochemistry, Faculty of Medicine, Near East University, Nicosia, Cyprus
- Bioinformatics and Computational Biology Research Group, DESAM Institute, Near East University, Nicosia, Cyprus
| | - Alper Gezdirici
- Department of Medical Genetics, Basaksehir Cam and Sakura City Hospital, 34480, Istanbul, Turkey
| | - Semih Bolu
- Department of Pediatric Endocrinology, Adıyaman Training and Research Hospital, Adıyaman, Turkey
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19
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Deng Y, Hu JC, He SH, Lou B, Ding TB, Yang JT, Mo MG, Ye DY, Zhou L, Jiang XC, Yu K, Dong JB. Sphingomyelin synthase 2 facilitates M2-like macrophage polarization and tumor progression in a mouse model of triple-negative breast cancer. Acta Pharmacol Sin 2021; 42:149-159. [PMID: 32451413 PMCID: PMC7921660 DOI: 10.1038/s41401-020-0419-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 04/14/2020] [Indexed: 12/31/2022] Open
Abstract
High infiltration of M2-polarized macrophages in the primary tumor indicates unfavorable prognosis and poor overall survival in the patients with triple-negative breast cancer (TNBC). Thus, reversing M2-polarized tumor-associated macrophages in the tumors has been considered as a potential therapeutic strategy for TNBC. Sphingomyelin synthase 2 (SMS2) is the key enzyme for sphingomyelin production, which plays an important role in plasma membrane integrity and function. In this study we investigated whether SMS2 inhibitor or SMS2 gene knockout could reduce macrophages M2 polarization and tumor progression in a mouse model of TNBC. We showed that SMS2 mRNA expression was linked to immunosuppressive tumor microenvironment and poor prognosis in TNBC patients. The knockout of SMS2 or application of 15w (a specific SMS2 inhibitor) markedly decreased the generation of M2-type macrophages in vitro, and reduced the tumor weight and lung metastatic niche formation in a 4T1-TNBC mouse model. We further demonstrated that the in vivo antitumor efficacy of 15w was accompanied by a multifaceted remodeling of tumor immune environment reflecting not only the suppression of M2-type macrophages but also diminished levels of regulatory T cells and myeloid-derived suppressor cells leading to a dramatically improved infiltration of antitumor CD8+ T lymphocytes. Collectively, our results reveal a novel and important role of SMS2 in the protumorigenic function and may offer a new strategy for macrophage-targeted anticancer therapy.
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Affiliation(s)
- Yan Deng
- Department of Pharmacology and Biochemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Jia-Chun Hu
- Department of Pharmacology and Biochemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Shu-Hua He
- Department of Pharmacology and Biochemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Bin Lou
- Department of Pharmacology and Biochemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Ting-Bo Ding
- Experiment & Teaching Center, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Jin-Tong Yang
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Ming-Guang Mo
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - De-Yong Ye
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Lu Zhou
- Department of Medicinal Chemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - Xian-Cheng Jiang
- Department of Cell Biology, SUNY Downstate Medical Center, Brooklyn, NY, 11203, USA
| | - Ker Yu
- Department of Pharmacology and Biochemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China.
| | - Ji-Bin Dong
- Department of Pharmacology and Biochemistry, School of Pharmacy, Fudan University, Shanghai, 201203, China.
- Shanghai Engineering Research Center of Immunotherapeutics, Fudan University, Shanghai, 201203, China.
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20
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Carboni E, Sestito S, Lucente M, Morrone A, Zampini L, Chimenz R, Ceravolo MD, De Sarro R, Ceravolo G, Calabrò MP, Parisi F, Moricca MT, Pensabene L, Musolino D, Concolino D. Dilated cardiomyopathy in mucolipidosis type 2. J BIOL REG HOMEOS AG 2020; 34:71-77. SPECIAL ISSUE: FOCUS ON PEDIATRIC CARDIOLOGY. [PMID: 33000604] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Mucolipidosis II and III are lysosomal storage diseases caused by pathogenetic mutations in GNPTAB and GNPTG genes which cause an impaired activity of the lysosomal hydrolase N-acetylglucosamine- 1-phosphotransferase, a key enzyme in the synthesis of the mannose-6-phosphate targeting signals on lysosomal enzymes. Patients with MLII alpha/beta present coarse facial features, cessation of statural growth, important skeletal manifestations, impaired neuromotor development and cardiorespiratory involvement. All children appear to have cardiac involvement, but severe dilated cardiomyopathy is uncommon. In this report we describe the case of an 11-month-old girl who is affected by a MLII. Analysis of the GNPTAB gene identified at a heterozygous level the previously described gene variants c. 2693delA p(Lys898Serfs*13) and c. 2956C>T p(Arg986Cys). Her main clinical features were coarse face with gingival hypertrophy, dysostosis multiplex, recurrent respiratory infection and an early onset of dilated cardiomyopathy, an uncommon feature for MLII. To our knowledge, dilated cardiomyopathy has been previously described in literature in only two cases of MLII and in one patient affected by MLIII.
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Affiliation(s)
- E Carboni
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - S Sestito
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - M Lucente
- Neonatology and Neonatal Intensive Care Unit, "Pugliese-Ciaccio" Hospital, Catanzaro, Italy
| | - A Morrone
- Paediatric Neurology Unit and Laboratories, Neuroscience Department, A. Meyer Children's Hospital, Florence, Italy
| | - L Zampini
- Department of Clinical Sciences, Polytechnic University of the Marche, Ancona, Italy
| | - R Chimenz
- Department of Human Pathology in Adult and Developmental Age "Gaetano Barresi", Unit of Pediatric Nephrology, University of Messina, "G. Martino" Policlinic, Italy
| | - M D Ceravolo
- Department of Human Pathology in Adult and Developmental Age "Gaetano Barresi", Unit of Emergency Pediatrics, University of Messina, Policlinico "G. Martino" Messina, Italy
| | - R De Sarro
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - G Ceravolo
- Department of Human Pathology in Adult and Developmental Age "Gaetano Barresi", Unit of Pediatric Nephrology and Rheumatology with Dialysis, University of Messina, "G. Martino" Policlinic, Italy
| | - M P Calabrò
- Department of Human Pathology in Adult and Developmental Age "Gaetano Barresi", Unit of Pediatric Cardiology, University of Messina, "G. Martino" Policlinic, Italy
| | - F Parisi
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - M T Moricca
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - L Pensabene
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - D Musolino
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - D Concolino
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
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Nishiyama KV, Satta Y, Gojobori J. Do Genes Associated with Dyslexia of Chinese Characters Evolve Neutrally? Genes (Basel) 2020; 11:genes11060658. [PMID: 32560373 PMCID: PMC7349701 DOI: 10.3390/genes11060658] [Citation(s) in RCA: 2] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/13/2020] [Accepted: 06/13/2020] [Indexed: 12/29/2022] Open
Abstract
Dyslexia, or reading disability, is found to have a genetic basis, and several related genes have been reported. We investigated whether natural selection has acted on single nucleotide polymorphisms (SNPs) that were reported to be associated with risk/non-risk for the reading disability of Chinese characters. We applied recently developed 2D SFS-based statistics to SNP data of East Asian populations to examine whether there is any sign of selective sweep. While neutrality was not rejected for most SNPs, significant signs of selection were detected for two linkage disequilibrium (LD) regions containing the reported SNPs of GNPTAB and DCDC2. Furthermore, we searched for a selection target site among the SNPs in these LD regions, because a causal site is not necessarily a reported SNP but could instead be a tightly linked site. In both LD regions, we found candidate target sites, which may have an effect on expression regulation and have been selected, although which genes these SNPs affect remains unknown. Because most people were not engaged in reading until recently, it is unlikely that there has been selective pressure on reading ability itself. Consistent with this, our results suggest a possibility of genetic hitchhiking, whereby alleles of the reported SNPs may have increased in frequency together with the selected target, which could have functions for other genes and traits apart from reading ability.
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Khan MA, Zubaida B, Karim N, Cheema HA, Naeem M. Identification of two novel variants in GNPTAB underlying mucolipidosis II in a Pakistani family. J Pediatr Endocrinol Metab 2020; 33:647-651. [PMID: 32238606 DOI: 10.1515/jpem-2019-0426] [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: 09/13/2019] [Accepted: 02/06/2020] [Indexed: 11/15/2022]
Abstract
Background Mucolipidosis II is a rare inherited metabolic disorder characterized by multiple pathologies including coarse facial features, thickened skin, dysostosis multiplex, and skeletal abnormalities. The disorder results due to variants in GNPTAB leading to reduced activity of the enzyme GlcNAc-1-phosphotransferase (GlcNAc-PT). Methods In the present study, a consanguineous Pakistani family was diagnosed with MLII based on clinical and biochemical examination. Peripheral blood samples were collected and subjected to DNA sequencing of all coding exons along with exon-intron boundaries of GNPTAB. Results Molecular investigation of the family identified two novel variants c.25C > T: p.Gln9* (maternal allele) in exon 1 and c.1160C > T: p.Ala387Val (paternal allele) in exon 10 segregating in compound heterozygous form in the affected individuals. Conclusions The GNPTAB variant c.25C > T variant is highly plausible to undergo nonsense-mediated mRNA decay, while the GNPTAB variant c.1160C > T is located in a highly conserved domain, thus both the variants predict to lead to affect the enzyme activity. Two novel variants have been identified in GNPTAB as the underlying cause of ML-II in a Pakistani family. The study thus expands the available GNPTAB mutation spectrum.
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Affiliation(s)
- Muhammad Aman Khan
- Medical Genetics Research Laboratory, Department of Biotechnology, Quaid-i-Azam University, Islamabad, Pakistan
- Department of Pathology and Laboratory Medicine, Lady Reading Hospital, Peshawar, Pakistan
| | - Bibi Zubaida
- Medical Genetics Research Laboratory, Department of Biotechnology, Quaid-i-Azam University, Islamabad, Pakistan
| | - Noreen Karim
- Medical Genetics Research Laboratory, Department of Biotechnology, Quaid-i-Azam University, Islamabad, Pakistan
| | - Huma Arshad Cheema
- Department of Pediatric Gastroenterology, The Children's Hospital and The Institute of Child Health, Lahore, Pakistan
| | - Muhammad Naeem
- Medical Genetics Research Laboratory, Department of Biotechnology, Quaid-i-Azam University, Islamabad, Pakistan
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23
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Robinson ME, Bardai G, Veilleux LN, Glorieux FH, Rauch F. Musculoskeletal phenotype in two unrelated individuals with a recurrent nonsense variant in SGMS2. Bone 2020; 134:115261. [PMID: 32028018 DOI: 10.1016/j.bone.2020.115261] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 01/22/2020] [Accepted: 02/03/2020] [Indexed: 12/15/2022]
Abstract
Heterozygous mutations in the gene encoding the sphingomyelin synthase 2, SGMS2, have recently been linked to childhood-onset osteoporosis and skeletal dysplasia. One nonsense variant at position c.148C>T (p.Arg50*) has been associated with mild bone fragility with or without cranial sclerosis. Here we assessed the effect of the SGMS2 p.Arg50* variant in two unrelated probands with childhood-onset osteoporosis and their unaffected family members. We found that the p.Arg50* variant was associated with phenotypic variability, ranging from absence of a bone phenotype to severe vertebral compression fractures and low lumbar spine areal bone mineral density (BMD) as measured by dual energy x-ray absorptiometry. Peripheral quantitative computed tomography of the radius and tibia in the two probands revealed low cortical volumetric BMD and reduced cortical thickness. In addition, both probands were obese and suffered from muscle function deficits compared to sex- and age-matched controls. Long-term bisphosphonate treatment was associated with reshaping of previously compressed vertebral bodies.
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Affiliation(s)
- Marie-Eve Robinson
- Shriners Hospital for Children - Canada, McGill University, Montreal, QC, Canada; Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, ON, Canada.
| | - Ghalib Bardai
- Shriners Hospital for Children - Canada, McGill University, Montreal, QC, Canada
| | | | - Francis H Glorieux
- Shriners Hospital for Children - Canada, McGill University, Montreal, QC, Canada
| | - Frank Rauch
- Shriners Hospital for Children - Canada, McGill University, Montreal, QC, Canada
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24
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Barnes JW, Aarnio-Peterson M, Norris J, Haskins M, Flanagan-Steet H, Steet R. Upregulation of Sortilin, a Lysosomal Sorting Receptor, Corresponds with Reduced Bioavailability of Latent TGFβ in Mucolipidosis II Cells. Biomolecules 2020; 10:biom10050670. [PMID: 32357547 PMCID: PMC7277838 DOI: 10.3390/biom10050670] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 04/14/2020] [Accepted: 04/20/2020] [Indexed: 12/14/2022] Open
Abstract
Mucolipidosis II (ML-II) is a lysosomal disease caused by defects in the carbohydrate-dependent sorting of soluble hydrolases to lysosomes. Altered growth factor signaling has been identified as a contributor to the phenotypes associated with ML-II and other lysosomal disorders but an understanding of how these signaling pathways are affected is still emerging. Here, we investigated transforming growth factor beta 1 (TGFβ1) signaling in the context of ML-II patient fibroblasts, observing decreased TGFβ1 signaling that was accompanied by impaired TGFβ1-dependent wound closure. We found increased intracellular latent TGFβ1 complexes, caused by reduced secretion and stable localization in detergent-resistant lysosomes. Sortilin, a sorting receptor for hydrolases and TGFβ-related cytokines, was upregulated in ML-II fibroblasts as well as GNPTAB-null HeLa cells, suggesting a mechanism for inappropriate lysosomal targeting of TGFβ. Co-expression of sortilin and TGFβ in HeLa cells resulted in reduced TGFβ1 secretion. Elevated sortilin levels correlated with normal levels of cathepsin D in ML-II cells, consistent with a compensatory role for this receptor in lysosomal hydrolase targeting. Collectively, these data support a model whereby sortilin upregulation in cells with lysosomal storage maintains hydrolase sorting but suppresses TGFβ1 secretion through increased lysosomal delivery. These findings highlight an unexpected link between impaired lysosomal sorting and altered growth factor bioavailability.
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Affiliation(s)
- Jarrod W Barnes
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | | | - Joy Norris
- Greenwood Genetic Center, Greenwood, SC 29646, USA
| | - Mark Haskins
- Emeritus Professor, Pathology and Medical Genetics, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104-6051, USA
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25
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Gupta G, Baumlin N, Poon J, Ahmed B, Chiang YP, Railwah C, Kim MD, Rivas M, Goldenberg H, Elgamal Z, Salathe M, Panwala AA, Dabo A, Huan C, Foronjy R, Jiang XC, Wadgaonkar R, Geraghty P. Airway Resistance Caused by Sphingomyelin Synthase 2 Insufficiency in Response to Cigarette Smoke. Am J Respir Cell Mol Biol 2020; 62:342-353. [PMID: 31517509 PMCID: PMC7055695 DOI: 10.1165/rcmb.2019-0133oc] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 09/12/2019] [Indexed: 12/15/2022] Open
Abstract
Sphingomyelin synthase is responsible for the production of sphingomyelin (SGM), the second most abundant phospholipid in mammalian plasma, from ceramide, a major sphingolipid. Knowledge of the effects of cigarette smoke on SGM production is limited. In the present study, we examined the effect of chronic cigarette smoke on sphingomyelin synthase (SGMS) activity and evaluated how the deficiency of Sgms2, one of the two isoforms of mammalian SGMS, impacts pulmonary function. Sgms2-knockout and wild-type control mice were exposed to cigarette smoke for 6 months, and pulmonary function testing was performed. SGMS2-dependent signaling was investigated in these mice and in human monocyte-derived macrophages of nonsmokers and human bronchial epithelial (HBE) cells isolated from healthy nonsmokers and subjects with chronic obstructive pulmonary disease (COPD). Chronic cigarette smoke reduces SGMS activity and Sgms2 gene expression in mouse lungs. Sgms2-deficient mice exhibited enhanced airway and tissue resistance after chronic cigarette smoke exposure, but had similar degrees of emphysema, compared with smoke-exposed wild-type mice. Sgms2-/- mice had greater AKT phosphorylation, peribronchial collagen deposition, and protease activity in their lungs after smoke inhalation. Similarly, we identified reduced SGMS2 expression and enhanced phosphorylation of AKT and protease production in HBE cells isolated from subjects with COPD. Selective inhibition of AKT activity or overexpression of SGMS2 reduced the production of several matrix metalloproteinases in HBE cells and monocyte-derived macrophages. Our study demonstrates that smoke-regulated Sgms2 gene expression influences key COPD features in mice, including airway resistance, AKT signaling, and protease production.
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Affiliation(s)
- Gayatri Gupta
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
| | - Nathalie Baumlin
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, Kansas; and
| | - Justin Poon
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
| | - Begum Ahmed
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
| | | | | | - Michael D. Kim
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, Kansas; and
| | - Melissa Rivas
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
| | - Hannah Goldenberg
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
| | - Ziyad Elgamal
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
| | - Matthias Salathe
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, Kansas; and
| | - Apurav A. Panwala
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
| | - Abdoulaye Dabo
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
- Department of Cell Biology, and
| | - Chongmin Huan
- Department of Cell Biology, and
- Department of Surgery, State University of New York Downstate Medical Center, Brooklyn, New York
| | - Robert Foronjy
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
- Department of Cell Biology, and
| | - Xian-Cheng Jiang
- Department of Cell Biology, and
- VA Medical Center, Brooklyn, New York
| | - Raj Wadgaonkar
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
- Department of Cell Biology, and
- VA Medical Center, Brooklyn, New York
| | - Patrick Geraghty
- Division of Pulmonary and Critical Care Medicine, Department of Medicine
- Department of Cell Biology, and
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Benito-Aragón C, Gonzalez-Sarmiento R, Liddell T, Diez I, d'Oleire Uquillas F, Ortiz-Terán L, Bueichekú E, Chow HM, Chang SE, Sepulcre J. Neurofilament-lysosomal genetic intersections in the cortical network of stuttering. Prog Neurobiol 2020; 184:101718. [PMID: 31669185 PMCID: PMC6938554 DOI: 10.1016/j.pneurobio.2019.101718] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [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: 02/07/2019] [Revised: 08/03/2019] [Accepted: 10/12/2019] [Indexed: 02/02/2023]
Abstract
The neurobiological underpinnings of stuttering, a speech disorder characterized by disrupted speech fluency, remain unclear. While recent developments in the field have afforded researchers the ability to pinpoint several genetic profiles associated with stuttering, how these specific genetic backgrounds impact neuronal circuits and how they generate or facilitate the emergence of stuttered speech remains unknown. In this study, we identified the large-scale cortical network that characterizes stuttering using functional connectivity MRI and graph theory. We performed a spatial similarity analysis that examines whether the topology of the stuttering cortical network intersects with genetic expression levels of previously reported genes for stuttering from the protein-coding transcriptome data of the Allen Human Brain Atlas. We found that GNPTG - a gene involved in the mannose-6-phosphate lysosomal targeting pathways - was significantly co-localized with the stuttering cortical network. An enrichment analysis demonstrated that the genes identified with the stuttering cortical network shared a significantly overrepresented biological functionality of Neurofilament Cytoskeleton Organization (NEFH, NEFL and INA). The relationship between lysosomal pathways, cytoskeleton organization, and stuttering, was investigated by comparing the genetic interactome between GNPTG and the neurofilament genes implicated in the current study. We found that genes of the interactome network, including CDK5, SNCA, and ACTB, act as functional links between lysosomal and neurofilament genes. These findings support the notion that stuttering is due to a lysosomal dysfunction, which has deleterious effects on the neurofilament organization of the speech neuronal circuits. They help to elucidate the intriguing, unsolved link between lysosomal mutations and the presence of stuttering.
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Affiliation(s)
- Claudia Benito-Aragón
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; University of Navarra School of Medicine, University of Navarra, Pamplona, Navarra, Spain
| | - Ricardo Gonzalez-Sarmiento
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; University of Navarra School of Medicine, University of Navarra, Pamplona, Navarra, Spain
| | - Thomas Liddell
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; University of Exeter, Exeter, England, UK
| | - Ibai Diez
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; Neurotechnology Laboratory, Tecnalia Health Department, Tecnalia, Derio, Basque Country, Spain
| | - Federico d'Oleire Uquillas
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Laura Ortiz-Terán
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Elisenda Bueichekú
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; Neuropsychology and Functional Neuroimaging Group, Department of Basic Psychology, Universitat Jaume I, Castellón, Spain
| | - Ho Ming Chow
- Department of Psychiatry, University of Michigan, Michigan, USA; Katzin Diagnostic and Research PET/MRI Center, Nemours/Alfred I. duPont Hospital for Children, Wilmington, DE, USA
| | - Soo-Eun Chang
- Department of Psychiatry, University of Michigan, Michigan, USA; Cognitive Imaging Research Center, Department of Radiology, Michigan State University, East Lansing, MI, USA
| | - Jorge Sepulcre
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA.
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Yang C, Pan J, Linpeng S, Li Z, Tan H, Wu L. Identification of Five Novel Mutations Causing Rare Lysosomal Storage Diseases. Med Sci Monit 2019; 25:7634-7644. [PMID: 31603145 PMCID: PMC6800466 DOI: 10.12659/msm.915876] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 06/06/2019] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Lysosomal storage diseases (LSDs), a group of rare inherited metabolic disorders, result from specific lysosomal proteins deficiencies in the degradation of biomacromolecule, including over 70 different diseases, most of which are autosomal recessive. LSDs are multisystem disorders, and the clinical manifestations are usually broad and severe, involving the skeletal system, central nervous system (CNS), cardiovascular system, etc. Besides, patients with some subtypes of LSD have distinctive facial features. MATERIAL AND METHODS We performed next generation sequencing on 4 suspected mucopolysaccharidosis (MPS) cases to determine the genetic causes of the disease. By in vitro molecular cell assay, such as real-time polymerase chain reaction (RT-PCR) and western blot, we tested the pathogenicity of candidate variants. RESULTS We detected 5 novel mutations in 4 patients. The mutations were: c.211_214del and c.1270C>T in GUSB; c.1284+1C>A and c.2404C>T in GNPTAB; and c.717C>A in FUCA1). We identified a rare mucopolysaccharidosis VII patient, a rare fucosidosis patient, and 2 rare mucolipidosis II patients, one of which was an atypical patient. We also present a new pathogenic conjecture about a small deletion in GUSB. CONCLUSIONS Our study described rare diseases in Chinese patients and our results enrich the phenotype spectrum of related diseases, as well as mutation spectrum of related genes, which might be significant for clinical disease diagnosis and prenatal diagnosis.
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Do KH, Park HE, Byun JW, Lee WK. Virulence and antimicrobial resistance profiles of Escherichia coli encoding mcr gene from diarrhoeic weaned piglets in Korea during 2007-2016. J Glob Antimicrob Resist 2019; 20:324-327. [PMID: 31542552 DOI: 10.1016/j.jgar.2019.09.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 09/11/2019] [Accepted: 09/13/2019] [Indexed: 12/18/2022] Open
Abstract
OBJECTIVE This study aimed to analyse the presence of mcr genes and virulence genes in Escherichia coli (E. coli) isolates from diarrhoeic piglets between 2007-2016 in Korea. METHODS A total of 364 E. coli isolates were obtained from diarrhoeic weaned piglets between 2007-2016. Minimum inhibitory concentrationss were determined according to the Clinical and Laboratory Standards Institute (CLSI). DNA samples were tested for the presence of mcr-1, mcr-2 and mcr-3 genes. Furthermore, multiplex PCR was used to detect toxin, fimbrial and non-fimbrial adhesin genes. RESULTS It was found that 2.5% (nine of 364) of the isolates carried the mcr genes. Four isolates carried the mcr-1 gene and eight isolates had the mcr-3 gene. Three isolates carried both mcr-1 and mcr-3 genes; the mcr-2 gene was not found. All isolates carrying mcr genes were multidrug-resistant. F18 (77.8%, seven of nine) and Stx2e (44.4%, four of nine) were frequently detected in E. coli carrying the mcr gene. CONCLUSIONS In conclusion, it would appear that the most prevalent mcr gene of E. coli from diarrhoeic weaned piglets in Korea was mcr-3. It is believed that this is the first report of two plasmid-mediated colistin resistance genes - mcr-1 and mcr-3 - coexisting in the same isolates (0258, 0491, 0516) from piglets with diarrhoea in Korea. Those mcr-positive isolates showed multidrug resistance and the majority of those encoded Stx2e and F18. This indicates the risk of inefficient treatment for oedema disease in weaned piglets.
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Affiliation(s)
- Kyung-Hyo Do
- College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea
| | - Ho-Eun Park
- College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea
| | - Jae-Won Byun
- Animal and Plant Quarantine Agency, Gimcheon, 39660, Republic of Korea
| | - Wan-Kyu Lee
- College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Republic of Korea.
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29
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Frigerio-Domingues CE, Gkalitsiou Z, Zezinka A, Sainz E, Gutierrez J, Byrd C, Webster R, Drayna D. Genetic factors and therapy outcomes in persistent developmental stuttering. J Commun Disord 2019; 80:11-17. [PMID: 31003007 DOI: 10.1016/j.jcomdis.2019.03.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 03/18/2019] [Accepted: 03/31/2019] [Indexed: 06/09/2023]
Abstract
PURPOSE We investigated whether outcomes of therapy for persistent developmental stuttering differ in individuals who carry a mutation in one of the known genes associated with stuttering compared to individuals without such mutations. METHOD We studied outcomes of an intensive fluency shaping-based therapy program in individuals with persistent developmental stuttering. We evaluated a cohort of 51 stuttering individuals with who carried a mutation in either the GNPTAB, GNPTG, NAGPA, or AP4E1 gene. We compared therapy outcomes in these individuals with outcomes in 51 individuals matched for age, gender, and ethnicity, who stutter and underwent the same therapy program, and did not carry a mutation in any of these genes. Fluency pre- and post-therapy was evaluated using blinded observer-based quantitative stuttering dysfluency measures (Dysfluent Words Score, DWS), and by subjects' self-reported measures of struggle, avoidance and expectancy behavior associated with speaking (Perceptions of Stuttering Inventory, PSI). The difference between pre- and post-therapy fluency scores was taken as the measure of near-term therapy efficacy. RESULTS Comparison of fluency measures showed a strong effect of therapy overall. Mutation carriers achieved significantly less resolution in PSI following therapy, with PSI scores showing significantly less improvement in individuals who carry a mutation (p = 0.0157, RR = 1.75, OR = 2.92) while the group difference in DWS between carriers and non-carriers was statistically not significant in the present study, the trend observed in the results warrants further research focused on this important issue. CONCLUSIONS These results suggest stuttering is more resistant to therapy in individuals who carry a mutation in one of the genes known to be associated with stuttering.
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Affiliation(s)
- Carlos E Frigerio-Domingues
- National Institute on Deafness and Other Communication Disorders, National Institutes of Health, 35A Convent Drive, Bethesda, MD 20892, USA
| | - Zoi Gkalitsiou
- Lang Stuttering Institute and Moody College of Communication, 300 W. Dean Keeton (A0900), University of Texas, Austin, TX 78712, USA
| | - Alexandra Zezinka
- National Institute on Deafness and Other Communication Disorders, National Institutes of Health, 35A Convent Drive, Bethesda, MD 20892, USA
| | - Eduardo Sainz
- National Institute on Deafness and Other Communication Disorders, National Institutes of Health, 35A Convent Drive, Bethesda, MD 20892, USA
| | - Joanne Gutierrez
- National Institute on Deafness and Other Communication Disorders, National Institutes of Health, 35A Convent Drive, Bethesda, MD 20892, USA
| | - Courtney Byrd
- Lang Stuttering Institute and Moody College of Communication, 300 W. Dean Keeton (A0900), University of Texas, Austin, TX 78712, USA
| | - Ronald Webster
- Hollins Communications Research Institute, 6851 Enon Drive, Roanoke, VA 24019, USA
| | - Dennis Drayna
- National Institute on Deafness and Other Communication Disorders, National Institutes of Health, 35A Convent Drive, Bethesda, MD 20892, USA.
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Wang C, Ming B, Wu X, Wu T, Cai S, Hu P, Tang J, Tan Z, Liu C, Zhong J, Zheng F, Dong L. Sphingomyelin synthase 1 enhances BCR signaling to promote lupus-like autoimmune response. EBioMedicine 2019; 45:578-587. [PMID: 31262710 PMCID: PMC6642282 DOI: 10.1016/j.ebiom.2019.06.038] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 06/14/2019] [Accepted: 06/19/2019] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Sphingomyelin synthase 1 (SMS1) has been reported to participate in hepatitis and atherosclerosis. However, its role in autoimmune response is not clear. This study investigates the possible involvement of SMS1 in B-cell activation and lupus-like autoimmunity. METHODS SMS1 knockout lupus-like animal model and SLE patient samples were utilized. B-cell activation and associated signal transduction were detected by flow cytometry, confocal analysis and western blotting. The SMS1 expression in B cells was measured by real-time qPCR. FINDINGS SMS1 deficiency suppressed B-cell activation in culture, which was restored by exogenous SM supplementation. The BCR-mediated early signal transduction including the colocalization of BCR with F-actin or pY/pBtk, and the phosphorylation of intracellular Fyn and Syk were impaired in SMS1 knockout B cells. Furthermore, SMS1 knockout mice showed reduced production and deposition of autoantibodies, accompanied by less severe kidney pathological changes after pristane induction. SMS1 deficiency also displayed lower autoantibody titers and 24 h urine protein excretion in bm12-induced lupus, which were associated with reduced B-cell activation. Adoptively transferred wide-type B cells partially recovered B-cell activation and autoantibody production in SMS1 deficient bm12-induced lupus mice. Moreover, the SMS1 mRNA level in B cells of SLE patients was increased and positively correlated with the serum anti-dsDNA level, IgG and globulin titers. INTERPRETATION These data suggest that SMS1 is involved in lupus-like autoimmunity via regulating BCR signal transduction and B cell activation. (Word count for the abstract: 230).
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Affiliation(s)
- Chenqiong Wang
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, HuBei, China
| | - Bingxia Ming
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, HuBei, China
| | - Xuefen Wu
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, HuBei, China
| | - Tong Wu
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, HuBei, China
| | - Shaozhe Cai
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, HuBei, China
| | - Peng Hu
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, HuBei, China
| | - Jungen Tang
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, HuBei, China
| | - Zheng Tan
- Department of Immunology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Chaohong Liu
- Department of Pathogen Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, HuBei, China
| | - Jixin Zhong
- Cardiovascular Research Institute, Case Western Reserve University, Cleveland, OH, United States
| | - Fang Zheng
- Department of Immunology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China.
| | - Lingli Dong
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, HuBei, China.
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Hua L, Wu N, Zhao R, He X, Liu Q, Li X, He Z, Yu L, Yan N. Sphingomyelin Synthase 2 Promotes Endothelial Dysfunction by Inducing Endoplasmic Reticulum Stress. Int J Mol Sci 2019; 20:ijms20122861. [PMID: 31212751 PMCID: PMC6627305 DOI: 10.3390/ijms20122861] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Revised: 05/30/2019] [Accepted: 06/04/2019] [Indexed: 12/29/2022] Open
Abstract
Endothelial dysfunction (ED) is an important contributor to atherosclerotic cardiovascular disease. Our previous study demonstrated that sphingomyelin synthase 2 (SMS2) promotes ED. Moreover, endoplasmic reticulum (ER) stress can lead to ED. However, whether there is a correlation between SMS2 and ER stress is unclear. To examine their correlation and determine the detailed mechanism of this process, we constructed a human umbilical vein endothelial cell (HUVEC) model with SMS2 overexpression. These cells were treated with 4-PBA or simvastatin and with LiCl and salinomycin alone. The results showed that SMS2 can promote the phosphorylation of lipoprotein receptor-related protein 6 (LRP6) and activate the Wnt/β-catenin pathway and that activation or inhibition of the Wnt/β-catenin pathway can induce or block ER stress, respectively. However, inhibition of ER stress by 4-PBA can decrease ER stress and ED. Furthermore, when the biosynthesis of cholesterol is inhibited by simvastatin, the reduction in intracellular cholesterol coincides with a decrease in ER stress and ED. Collectively, our results demonstrate that SMS2 can activate the Wnt/β-catenin pathway and promote intracellular cholesterol accumulation, both of which can contribute to the induction of ER stress and finally lead to ED.
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Affiliation(s)
- Lingyue Hua
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Nanchang University, Nanchang 330006, Jiangxi, China.
| | - Na Wu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Nanchang University, Nanchang 330006, Jiangxi, China.
| | - Ruilin Zhao
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Nanchang University, Nanchang 330006, Jiangxi, China.
| | - Xuanhong He
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Nanchang University, Nanchang 330006, Jiangxi, China.
| | - Qian Liu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Nanchang University, Nanchang 330006, Jiangxi, China.
| | - Xiatian Li
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Nanchang University, Nanchang 330006, Jiangxi, China.
| | - Zhiqiang He
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Nanchang University, Nanchang 330006, Jiangxi, China.
| | - Lehan Yu
- School of Basic Medical Experiments Center, Nanchang University, Nanchang 330006, Jiangxi, China.
| | - Nianlong Yan
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Nanchang University, Nanchang 330006, Jiangxi, China.
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32
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Yang K, Lou G, Qi N, Zhang Y, Zhu H, Wang L, Wang X, Zhang B. [A novel compound heterozygous mutation of GNPTAB gene underlying a case with mucolipidosis type II α/β]. Zhonghua Yi Xue Yi Chuan Xue Za Zhi 2019; 36:606-609. [PMID: 31055817 DOI: 10.3760/cma.j.issn.1003-9406.2019.06.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
OBJECTIVE To analyze the clinical features and genetic mutations in a patient with mucolipidosis type II α/β by using next generation sequencing. METHODS Clinical data of the patient was collected. Genomic DNA of the patient and her parents was extracted by a standard method. The patient was subjected to targeted sequencing using an Ion Ampliseq panel, which included genes related to mucolipidosis and mucopolysaccharidosis. Suspected mutations were verified by Sanger sequencing. RESULTS Compound heterozygous mutations, namely c.1284+1G>T and c.1090C>T (p.Arg364*), were detected in the patient, which were respectively inherited from her mother and father. No other disease-causing mutation was detected in the patient. GNPTAB c.1090C>T was known to be pathogenic, while GNPTAB c.1284+1G>T is a novel mutation. The same mutations were not detected among 50 healthy controls. CONCLUSION The compound heterozygous mutations c.1284+1G>T and c.1090C>T (p.Arg364*) of GNPTAB gene probably account for the mucolipidosis type II α/β in the patient. NGS has a great value for the molecular diagnosis and typing of mucolipidosis.
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Affiliation(s)
- Ke Yang
- Medical Genetics Institute of Henan Province, People's Hospital, Zhengzhou University, Zhengzhou, Henan 450003, China.
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33
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Yan D, Yadav SR, Paterlini A, Nicolas WJ, Petit JD, Brocard L, Belevich I, Grison MS, Vaten A, Karami L, El-Showk S, Lee JY, Murawska GM, Mortimer J, Knoblauch M, Jokitalo E, Markham JE, Bayer EM, Helariutta Y. Sphingolipid biosynthesis modulates plasmodesmal ultrastructure and phloem unloading. Nat Plants 2019; 5:604-615. [PMID: 31182845 PMCID: PMC6565433 DOI: 10.1038/s41477-019-0429-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 04/17/2019] [Indexed: 05/18/2023]
Abstract
During phloem unloading, multiple cell-to-cell transport events move organic substances to the root meristem. Although the primary unloading event from the sieve elements to the phloem pole pericycle has been characterized to some extent, little is known about post-sieve element unloading. Here, we report a novel gene, PHLOEM UNLOADING MODULATOR (PLM), in the absence of which plasmodesmata-mediated symplastic transport through the phloem pole pericycle-endodermis interface is specifically enhanced. Increased unloading is attributable to a defect in the formation of the endoplasmic reticulum-plasma membrane tethers during plasmodesmal morphogenesis, resulting in the majority of pores lacking a visible cytoplasmic sleeve. PLM encodes a putative enzyme required for the biosynthesis of sphingolipids with very-long-chain fatty acid. Taken together, our results indicate that post-sieve element unloading involves sphingolipid metabolism, which affects plasmodesmal ultrastructure. They also raise the question of how and why plasmodesmata with no cytoplasmic sleeve facilitate molecular trafficking.
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Affiliation(s)
- Dawei Yan
- The Sainsbury Laboratory, University of Cambridge, Cambridge, UK
| | - Shri Ram Yadav
- Helsinki Institute of Life Science/Institute of Biotechnology, University of Helsinki, Helsinki, Finland
- Department of Biotechnology, Indian Institute of Technology, Roorkee, India
| | - Andrea Paterlini
- The Sainsbury Laboratory, University of Cambridge, Cambridge, UK
| | - William J Nicolas
- Laboratoire de Biogenèse Membranaire, UMR 5200, CNRS, Université de Bordeaux, Villenave d'Ornon, France
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Jules D Petit
- Laboratoire de Biogenèse Membranaire, UMR 5200, CNRS, Université de Bordeaux, Villenave d'Ornon, France
- Laboratoire de Biophysique Moléculaire aux Interfaces, TERRA Research Centre, GX ABT, Université de Liège, Gembloux, Belgium
| | - Lysiane Brocard
- Bordeaux Imaging Centre, Plant Imaging Platform, UMS 3420, INRA-CNRS-INSERM, University of Bordeaux, Villenave-d'Ornon, France
| | - Ilya Belevich
- Helsinki Institute of Life Science/Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Magali S Grison
- Laboratoire de Biogenèse Membranaire, UMR 5200, CNRS, Université de Bordeaux, Villenave d'Ornon, France
| | - Anne Vaten
- Helsinki Institute of Life Science/Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Leila Karami
- Helsinki Institute of Life Science/Institute of Biotechnology, University of Helsinki, Helsinki, Finland
- Department of Horticulture, Faculty of Agriculture and Natural Resources, Persian Gulf University, Bushehr, Iran
| | - Sedeer El-Showk
- Helsinki Institute of Life Science/Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Jung-Youn Lee
- Department of Plant and Soil Sciences, Delaware Biotechnology Institute, University of Delaware, Newark, DE, USA
| | - Gosia M Murawska
- Biosciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
- Joint Bioenergy Institute, Emeryville, CA, USA
| | - Jenny Mortimer
- Biosciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
- Joint Bioenergy Institute, Emeryville, CA, USA
| | - Michael Knoblauch
- School of Biological Sciences, Washington State University, Pullman, WA, USA
| | - Eija Jokitalo
- Helsinki Institute of Life Science/Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Jennifer E Markham
- Department of Biochemistry, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Emmanuelle M Bayer
- Laboratoire de Biogenèse Membranaire, UMR 5200, CNRS, Université de Bordeaux, Villenave d'Ornon, France.
| | - Ykä Helariutta
- The Sainsbury Laboratory, University of Cambridge, Cambridge, UK.
- Helsinki Institute of Life Science/Institute of Biotechnology, University of Helsinki, Helsinki, Finland.
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Shi XX, Zhang H, Chen M, Zhang YD, Zhu MF, Zhang MJ, Li FQ, Wratten S, Zhou WW, Mao C, Zhu ZR. Two sphingomyelin synthase homologues regulate body weight and sphingomyelin synthesis in female brown planthopper, N. lugens (Stål). Insect Mol Biol 2019; 28:253-263. [PMID: 30375099 DOI: 10.1111/imb.12549] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Although sphingomyelins known to be are lipid constituents of the plasma membrane in vertebrates, much remains obscure about the metabolism of sphingomyelins in insects. With ultra performance liquid chromatography-time-of-flight-tandem mass spectrometry analysis, we revealed for the first time that sphingomyelins are abundant in Nilaparvata lugens (Stål), the brown planthopper (BPH), and their biosynthesis is carried out by sphingomyelin synthase-like protein 2 (SMSL2), which is homologous to sphingomyelin synthase-related protein (SMSr). Unlike other insect species, high concentrations of sphingomyelins rather than ceramide phosphoethanolamines exist in the BPH. Two putative genes, which are homologous to SMSr, are named Nilaparvata lugens SMS-like 1 (NlSMSL1) and 2 (NlSMSL2). Knockdowns of both NlSMSL2 and NlSMSL1 were conducted but only the first decreased concentrations of sphingomyelins in the BPH, indicating that NlSMSL2 plays a role in the biosynthesis of sphingomyelins. Real-time quantitative PCR analysis revealed both NlSMSL1 and NlSMSL2 are highly expressed in BPH adults, with NlSMSL1 specifically highly expressed in reproductive organs (ovaries and testes) whereas NlSMSL2 was highly expressed in the malpighian tubules. The knockdown of NlSMSL1 or NlSMSL2 increased BPH female body weight but not that of males, suggesting sex-specific roles for SMSLs in influencing BPH body weight. The results suggest that NlSMSL2 catalyses the synthesis of sphingomyelins and maintains female BPH body weight through alteration of sphingolipid content.
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Affiliation(s)
- X-X Shi
- State Key Laboratory of Rice Biology, Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Hangzhou, Zhejiang, China
- Institute of Insect Sciences, Zhejiang University, Hangzhou, Zhejiang, China
| | - H Zhang
- State Key Laboratory of Rice Biology, Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Hangzhou, Zhejiang, China
| | - M Chen
- State Key Laboratory of Rice Biology, Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Hangzhou, Zhejiang, China
| | - Y-D Zhang
- State Key Laboratory of Rice Biology, Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Hangzhou, Zhejiang, China
| | - M-F Zhu
- State Key Laboratory of Rice Biology, Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Hangzhou, Zhejiang, China
| | - M-J Zhang
- State Key Laboratory of Rice Biology, Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Hangzhou, Zhejiang, China
| | - F-Q Li
- State Key Laboratory of Rice Biology, Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Hangzhou, Zhejiang, China
| | - S Wratten
- Bio-Protection Research Centre, Lincoln University, Lincoln, New Zealand
| | - W-W Zhou
- State Key Laboratory of Rice Biology, Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Hangzhou, Zhejiang, China
| | - C Mao
- Department of Medicine and Stony Brook Cancer Center, The State University of New York at Stony Brook, Stony Brook, NY, USA
| | - Z-R Zhu
- State Key Laboratory of Rice Biology, Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Ministry of Agriculture, Hangzhou, Zhejiang, China
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Sakurai T, Hayasaka T, Sekiguchi H, Satoh H, Chen Z, Chiba H, Hui SP. Dietary salmon milt extracts attenuate hepatosteatosis and liver dysfunction in diet-induced fatty liver model. J Sci Food Agric 2019; 99:1675-1681. [PMID: 30198086 DOI: 10.1002/jsfa.9352] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 06/05/2018] [Revised: 08/30/2018] [Accepted: 09/02/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND Dietary nucleotides have several reported beneficial effects. Here, we report on a proteomic analysis of the effect of dietary nucleotides-rich salmon milt extract (SME) on the liver in a diet-induced fatty liver model. RESULTS Young male normal ddY mice were fed a normal chow diet, high carbohydrate diet (HCD), HCD containing 1% SME, or HCD containing 10% SME for 5 days following by a 2-day fast. Increased serum alanine transferase and aspartate transferase activities were observed in the HCD group and were significantly attenuated in the SME groups (P < 0.05). Hepatic steatosis was observed in all the HCD groups. Hepatic expression of Tnfα was significantly suppressed in the 10% SME group (P < 0.05). Comprehensive proteomic analysis of the liver in the SME groups revealed an increase in the levels of major proteins involved in mitochondrial bioenergetics, including peroxisome proliferator-activated receptor gamma co-activator 1 alpha, mitochondrial thioredoxin, cardiolipin synthase, peroxisome proliferator-activated receptor alpha, and carnitine palmitoyltransferase I. CONCLUSION Dietary SME improved liver function in the diet-induced fatty liver model. Activation of mitochondrial biogenetic function might be involved in this process. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Toshihiro Sakurai
- Faculty of Health Sciences, Hokkaido University, Sapporo, Japan
- Department of Food and Health Research, Life Science Institute Co. Ltd and Nissei Bio Co. Ltd, Center for Food and Medical Innovation, Institute for the Promotion of Business-Regional Collaboration, Hokkaido University, Sapporo, Japan
| | - Takahiro Hayasaka
- Faculty of Health Sciences, Hokkaido University, Sapporo, Japan
- Department of Food and Health Research, Life Science Institute Co. Ltd and Nissei Bio Co. Ltd, Center for Food and Medical Innovation, Institute for the Promotion of Business-Regional Collaboration, Hokkaido University, Sapporo, Japan
| | - Hirotaka Sekiguchi
- Department of Food and Health Research, Life Science Institute Co. Ltd and Nissei Bio Co. Ltd, Center for Food and Medical Innovation, Institute for the Promotion of Business-Regional Collaboration, Hokkaido University, Sapporo, Japan
- R&D Planning and Administration Department, Life Science Institute Co., Ltd, Tokyo, Japan
| | - Hiroshi Satoh
- Department of Food and Health Research, Life Science Institute Co. Ltd and Nissei Bio Co. Ltd, Center for Food and Medical Innovation, Institute for the Promotion of Business-Regional Collaboration, Hokkaido University, Sapporo, Japan
- Research and Development division, Hokkaido Research Institute, Nissei Bio Co. Ltd, Eniwa, Japan
| | - Zhen Chen
- Faculty of Health Sciences, Hokkaido University, Sapporo, Japan
- Department of Food and Health Research, Life Science Institute Co. Ltd and Nissei Bio Co. Ltd, Center for Food and Medical Innovation, Institute for the Promotion of Business-Regional Collaboration, Hokkaido University, Sapporo, Japan
| | - Hitoshi Chiba
- Faculty of Health Sciences, Hokkaido University, Sapporo, Japan
- Department of Food and Health Research, Life Science Institute Co. Ltd and Nissei Bio Co. Ltd, Center for Food and Medical Innovation, Institute for the Promotion of Business-Regional Collaboration, Hokkaido University, Sapporo, Japan
- Department of Nutrition, Sapporo University of Health Sciences, Sapporo, Japan
| | - Shu-Ping Hui
- Faculty of Health Sciences, Hokkaido University, Sapporo, Japan
- Department of Food and Health Research, Life Science Institute Co. Ltd and Nissei Bio Co. Ltd, Center for Food and Medical Innovation, Institute for the Promotion of Business-Regional Collaboration, Hokkaido University, Sapporo, Japan
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Abstract
Colistin is the last-resort antibiotic against lethal infections with multidrug-resistant bacterial pathogens. A rainbow coalition of mobile colistin resistance (mcr) genes raises global health concerns. Here, we describe the action and mechanism of colistin resistance imparted by MCR-4, a recently-identified member from the broader MCR family. We found that MCR-4 originates from the silenced variant of Shewanella frigidimarina via progressive evolution and forms a phylogenetically-distinct group from the well-studied MCR-1/2 family. Domain-swapping experiments further confirmed that MCR-1 and MCR-4 transmembrane and catalytic domains are not functionally-interchangeable. However, structural and functional analyses demonstrated that MCR-4 possesses a similar PE lipid substrate-recognizable cavity and exploits an almost-identical ping-pong catalysis mechanism. MCR-4 also can alleviate colistin-triggered accumulation of reactive oxygen species (ROS). Taken together, this finding constitutes a functional proof that MCR-4 proceeds in a distinct evolutionary path to fulfill a consistent molecular mechanism, resulting in phenotypic colistin resistance.
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Affiliation(s)
- Huimin Zhang
- Department of Pathogen Biology & Microbiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
- Department of General Intensive Care Unit of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
| | - Mengyun Hou
- Department of Pathogen Biology & Microbiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
- Department of General Intensive Care Unit of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
| | - Yongchang Xu
- Department of Pathogen Biology & Microbiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
- Department of General Intensive Care Unit of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
| | - Swaminath Srinivas
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA
| | - Man Huang
- Department of General Intensive Care Unit of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
| | - Lizhang Liu
- Department of Pathogen Biology & Microbiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
- Department of General Intensive Care Unit of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
| | - Youjun Feng
- Department of Pathogen Biology & Microbiology, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
- Department of General Intensive Care Unit of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058 China
- College of Animal Sciences, Zhejiang University, Hangzhou, Zhejiang 310058 China
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Hayashi Y, Nemoto-Sasaki Y, Matsumoto N, Hama K, Tanikawa T, Oka S, Saeki T, Kumasaka T, Koizumi T, Arai S, Wada I, Yokoyama K, Sugiura T, Yamashita A. Complex formation of sphingomyelin synthase 1 with glucosylceramide synthase increases sphingomyelin and decreases glucosylceramide levels. J Biol Chem 2018; 293:17505-17522. [PMID: 30242129 PMCID: PMC6231140 DOI: 10.1074/jbc.ra118.002048] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 08/21/2018] [Indexed: 12/23/2022] Open
Abstract
Sphingolipids, including sphingomyelin (SM) and glucosylceramide (GlcCer), are generated by the addition of a polar head group to ceramide (Cer). Sphingomyelin synthase 1 (SMS1) and glucosylceramide synthase (GCS) are key enzymes that catalyze the conversion of Cer to SM and GlcCer, respectively. GlcCer synthesis has been postulated to occur mainly in cis-Golgi, and SM synthesis is thought to occur in medial/trans-Golgi; however, SMS1 and GCS are known to partially co-localize in cisternae, especially in medial/trans-Golgi. Here, we report that SMS1 and GCS can form a heteromeric complex, in which the N terminus of SMS1 and the C terminus of GCS are in close proximity. Deletion of the N-terminal sterile α-motif of SMS1 reduced the stability of the SMS1-GCS complex, resulting in a significant reduction in SM synthesis in vivo In contrast, chemical-induced heterodimerization augmented SMS1 activity, depending on an increase in the amount and stability of the complex. Fusion of the SMS1 N terminus to the GCS C terminus via linkers of different lengths increased SM synthesis and decreased GlcCer synthesis in vivo These results suggest that formation of the SMS1-GCS heteromeric complex increases SM synthesis and decreases GlcCer synthesis. Importantly, this regulation of relative Cer levels by the SMS1-GCS complex was confirmed by CRISPR/Cas9-mediated knockout of SMS1 or GCS combined with pharmacological inhibition of Cer transport protein in HEK293T cells. Our findings suggest that complex formation between SMS1 and GCS is part of a critical mechanism controlling the metabolic fate of Cer in the Golgi.
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Affiliation(s)
- Yasuhiro Hayashi
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Yoko Nemoto-Sasaki
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Naoki Matsumoto
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Kotaro Hama
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Takashi Tanikawa
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Saori Oka
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Tadaaki Saeki
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Tatsuya Kumasaka
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Takanori Koizumi
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Seisuke Arai
- Department of Cell Science, Institute of Biomedical Sciences, Fukushima Medical University School of Medicine, Fukushima City, Fukushima 960-1295, Japan
| | - Ikuo Wada
- Department of Cell Science, Institute of Biomedical Sciences, Fukushima Medical University School of Medicine, Fukushima City, Fukushima 960-1295, Japan
| | - Kazuaki Yokoyama
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Takayuki Sugiura
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
| | - Atsushi Yamashita
- From the Faculty of Pharma-Science, Teikyo University, Tokyo 173- 8605, Japan and
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Kwak MJ, Lee HW, Kim YM, Cho SY, Park HD, Jin DK. Rare Association of Mucolipidosis III alpha/beta with Dilated Cardiomyopathy. Ann Clin Lab Sci 2018; 48:785-789. [PMID: 30610051] [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] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Mucolipidosis III alpha/beta (ML III alpha/beta) is an autosomal recessive lysosomal storage disorder caused by N-acetylglucosamine-1-phosphotransferase (GlcNAc-phosphotransferase) deficiency. It is characterized by coarse facial features, developmental delay, short stature, and skeletal deformities. Its cardiovascular symptoms include valvular thickening or hypertrophic cardiomyopathy. A 32-year-old female patient received heart transplantation due to end-stage heart failure caused by dilated cardiomyopathy (DCM). We performed whole exome sequencing to determine the etiology of DCM and/or skeletal deformities. The test revealed c.2715+1G>A and c.3173C>G mutations in the GNPTAB gene encoding the alpha and beta subunits of GlcNAc-phosphotransferase. Finally, she was diagnosed with ML III alpha/beta. This report describes a rare case of ML III alpha/beta associated with DCM. Our findings expand the clinical spectrum of ML III alpha/beta.
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Affiliation(s)
- Min Jung Kwak
- Department of Pediatrics, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Republic of Korea
| | - Hye Won Lee
- Division of Cardiology, Department of Internal Medicine, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Republic of Korea
| | - Young Mi Kim
- Department of Pediatrics, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Republic of Korea
| | - Sung Yoon Cho
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Hyung-Doo Park
- Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Dong-Kyu Jin
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
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Kunduri G, Turner-Evans D, Konya Y, Izumi Y, Nagashima K, Lockett S, Holthuis J, Bamba T, Acharya U, Acharya JK. Defective cortex glia plasma membrane structure underlies light-induced epilepsy in cpes mutants. Proc Natl Acad Sci U S A 2018; 115:E8919-E8928. [PMID: 30185559 PMCID: PMC6156639 DOI: 10.1073/pnas.1808463115] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Seizures induced by visual stimulation (photosensitive epilepsy; PSE) represent a common type of epilepsy in humans, but the molecular mechanisms and genetic drivers underlying PSE remain unknown, and no good genetic animal models have been identified as yet. Here, we show an animal model of PSE, in Drosophila, owing to defective cortex glia. The cortex glial membranes are severely compromised in ceramide phosphoethanolamine synthase (cpes)-null mutants and fail to encapsulate the neuronal cell bodies in the Drosophila neuronal cortex. Expression of human sphingomyelin synthase 1, which synthesizes the closely related ceramide phosphocholine (sphingomyelin), rescues the cortex glial abnormalities and PSE, underscoring the evolutionarily conserved role of these lipids in glial membranes. Further, we show the compromise in plasma membrane structure that underlies the glial cell membrane collapse in cpes mutants and leads to the PSE phenotype.
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Affiliation(s)
- Govind Kunduri
- Cancer and Developmental Biology Laboratory, National Cancer Institute, Frederick, MD 21702
| | | | - Yutaka Konya
- Department of Metabolomics, Kyushu University, Fukuoka 812-8582, Japan
| | - Yoshihiro Izumi
- Department of Metabolomics, Kyushu University, Fukuoka 812-8582, Japan
| | - Kunio Nagashima
- Electron Microscopy Laboratory, National Cancer Institute, Frederick, MD 21702
| | - Stephen Lockett
- Optical Microscopy and Analysis Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Joost Holthuis
- Molecular Cell Biology Division, University of Osnabrück, 49074 Osnabrück, Germany
| | - Takeshi Bamba
- Department of Metabolomics, Kyushu University, Fukuoka 812-8582, Japan
| | - Usha Acharya
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605
| | - Jairaj K Acharya
- Cancer and Developmental Biology Laboratory, National Cancer Institute, Frederick, MD 21702;
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Wassmann CS, Lund LC, Thorsing M, Lauritzen SP, Kolmos HJ, Kallipolitis BH, Klitgaard JK. Molecular mechanisms of thioridazine resistance in Staphylococcus aureus. PLoS One 2018; 13:e0201767. [PMID: 30089175 PMCID: PMC6082566 DOI: 10.1371/journal.pone.0201767] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 07/20/2018] [Indexed: 11/18/2022] Open
Abstract
Staphylococcus aureus has developed resistance towards the most commonly used anti-staphylococcal antibiotics. Therefore, there is an urgent need to find new treatment opportunities. A new approach relies on the use of helper compounds, which are able to potentiate the effect of antibiotics. A well-studied helper compound is thioridazine, which potentiates the effect of the β-lactam antibiotic dicloxacillin against Methicillin-resistant Staphylococcus aureus (MRSA). In order to identify thioridazine's mechanism of action and how it potentiates the effect of dicloxacillin, we generated thioridazine resistant strains of MRSA USA300 by serial passage experiments. Selected strains were whole-genome sequenced to find mutations causing thioridazine resistance. Genes observed to be mutated were attempted deleted in MRSA USA300. The cls gene encoding a cardiolipin synthase important for synthesis of the membrane lipid cardiolipin was found to be mutated in thioridazine resistant strains. Deletion of this gene resulted in a two-fold increased Minimum inhibitory concentrations (MIC) value for thioridazine compared to the wild type and decreased susceptibility similar to the thioridazine resistant strains. Since cardiolipin likely plays a role in resistance towards thioridazine, it might also be important for the mechanism of action behind the potentiating effect of thioridazine. TDZ is known to intercalate into the membrane and we show here that TDZ can depolarize the plasma membrane. However, our results indicate that the membrane potential reducing effect of TDZ is independent of the resistance mechanism.
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Affiliation(s)
| | - Lars Christian Lund
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Mette Thorsing
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Sabrina Prehn Lauritzen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Hans Jørn Kolmos
- Institute of Clinical Research, Research Unit of Clinical Microbiology, University of Southern Denmark, Odense, Denmark
| | | | - Janne Kudsk Klitgaard
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
- Institute of Clinical Research, Research Unit of Clinical Microbiology, University of Southern Denmark, Odense, Denmark
- * E-mail:
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Moorthi S, Burns TA, Yu GQ, Luberto C. Bcr-Abl regulation of sphingomyelin synthase 1 reveals a novel oncogenic-driven mechanism of protein up-regulation. FASEB J 2018; 32:4270-4283. [PMID: 29533737 PMCID: PMC6044059 DOI: 10.1096/fj.201701016r] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 02/26/2018] [Indexed: 12/13/2022]
Abstract
Bcr-Abl (break-point cluster region-abelson), the oncogenic trigger of chronic myelogenous leukemia (CML), has previously been shown to up-regulate the expression and activity of sphingomyelin synthase 1 (SMS1), which contributes to the proliferation of CML cells; however, the mechanism by which this increased expression of SMS1 is mediated remains unknown. In the current study, we show that Bcr-Abl enhances the expression of SMS1 via a 30-fold up-regulation of its transcription. Of most interest, the Bcr-Abl-regulated transcription of SMS1 is initiated from a novel transcription start site (TSS) that is just upstream of the open reading frame. This shift in TSS utilization generates an SMS1 mRNA with a substantially shorter 5' UTR compared with its canonical mRNA. This shorter 5' UTR imparts a 20-fold greater translational efficiency to SMS1 mRNA, which further contributes to the increase of its expression in CML cells. Therefore, our study demonstrates that Bcr-Abl increases SMS1 protein levels via 2 concerted mechanisms: up-regulation of transcription and enhanced translation as a result of the shift in TSS utilization. Remarkably, this is the first time that an oncogene-Bcr-Abl-has been demonstrated to drive such a mechanism that up-regulates the expression of a functionally important target gene, SMS1.-Moorthi, S., Burns, T. A., Yu, G.-Q., Luberto, C. Bcr-Abl regulation of sphingomyelin synthase 1 reveals a novel oncogenic-driven mechanism of protein up-regulation.
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Affiliation(s)
- Sitapriya Moorthi
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, New York, USA
| | - Tara Ann Burns
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Gui-Qin Yu
- Department of Physiology and Biophysics, Stony Brook University, Stony Brook, New York, USA
| | - Chiara Luberto
- Department of Physiology and Biophysics, Stony Brook University, Stony Brook, New York, USA
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Sustarsic EG, Ma T, Lynes MD, Larsen M, Karavaeva I, Havelund JF, Nielsen CH, Jedrychowski MP, Moreno-Torres M, Lundh M, Plucinska K, Jespersen NZ, Grevengoed TJ, Kramar B, Peics J, Hansen JB, Shamsi F, Forss I, Neess D, Keipert S, Wang J, Stohlmann K, Brandslund I, Christensen C, Jørgensen ME, Linneberg A, Pedersen O, Kiebish MA, Qvortrup K, Han X, Pedersen BK, Jastroch M, Mandrup S, Kjær A, Gygi SP, Hansen T, Gillum MP, Grarup N, Emanuelli B, Nielsen S, Scheele C, Tseng YH, Færgeman NJ, Gerhart-Hines Z. Cardiolipin Synthesis in Brown and Beige Fat Mitochondria Is Essential for Systemic Energy Homeostasis. Cell Metab 2018; 28:159-174.e11. [PMID: 29861389 PMCID: PMC6038052 DOI: 10.1016/j.cmet.2018.05.003] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 02/20/2018] [Accepted: 05/03/2018] [Indexed: 12/17/2022]
Abstract
Activation of energy expenditure in thermogenic fat is a promising strategy to improve metabolic health, yet the dynamic processes that evoke this response are poorly understood. Here we show that synthesis of the mitochondrial phospholipid cardiolipin is indispensable for stimulating and sustaining thermogenic fat function. Cardiolipin biosynthesis is robustly induced in brown and beige adipose upon cold exposure. Mimicking this response through overexpression of cardiolipin synthase (Crls1) enhances energy consumption in mouse and human adipocytes. Crls1 deficiency in thermogenic adipocytes diminishes inducible mitochondrial uncoupling and elicits a nuclear transcriptional response through endoplasmic reticulum stress-mediated retrograde communication. Cardiolipin depletion in brown and beige fat abolishes adipose thermogenesis and glucose uptake, which renders animals insulin resistant. We further identify a rare human CRLS1 variant associated with insulin resistance and show that adipose CRLS1 levels positively correlate with insulin sensitivity. Thus, adipose cardiolipin has a powerful impact on organismal energy homeostasis through thermogenic fat bioenergetics.
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Affiliation(s)
- Elahu G Sustarsic
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark; Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Tao Ma
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark; Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Matthew D Lynes
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA
| | - Michael Larsen
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Iuliia Karavaeva
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark; Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Jesper F Havelund
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense 5230, Denmark
| | - Carsten H Nielsen
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark; Department of Clinical Physiology, Nuclear Medicine & PET and Cluster for Molecular Imaging, Rigshospitalet, Copenhagen 2200, Denmark
| | | | - Marta Moreno-Torres
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense 5230, Denmark
| | - Morten Lundh
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark
| | - Kaja Plucinska
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark
| | - Naja Z Jespersen
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark; Centre of Inflammation and Metabolism and Centre for Physical Activity Research, Rigshospitalet, University Hospital of Copenhagen, Copenhagen 2200, Denmark
| | - Trisha J Grevengoed
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark
| | - Barbara Kramar
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark
| | - Julia Peics
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark; Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Jakob B Hansen
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark; Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Farnaz Shamsi
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA
| | - Isabel Forss
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense 5230, Denmark
| | - Ditte Neess
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense 5230, Denmark
| | - Susanne Keipert
- Helmholtz Diabetes Center and German Diabetes Center (DZD), Helmholtz Zentrum München, Neuherberg 85764, Germany
| | - Jianing Wang
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Katharina Stohlmann
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark
| | - Ivan Brandslund
- Lillebaelt Hospital, Vejle 7100, Denmark; Institute of Regional Health Research, University of Southern Denmark, Odense 5230, Denmark
| | | | - Marit E Jørgensen
- Steno Diabetes Center, Gentofte 2820, Denmark; National Institute of Public Health, Southern Denmark University, Copenhagen 1353, Denmark
| | - Allan Linneberg
- Research Center for Prevention and Health, Glostrup 2600, Denmark; Center for Clinical Research and Prevention, Bispebjerg and Frederiksberg Hospital, Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen 2200, Denmark
| | - Oluf Pedersen
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark
| | | | - Klaus Qvortrup
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Xianlin Han
- Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Bente Klarlund Pedersen
- Centre of Inflammation and Metabolism and Centre for Physical Activity Research, Rigshospitalet, University Hospital of Copenhagen, Copenhagen 2200, Denmark
| | - Martin Jastroch
- Helmholtz Diabetes Center and German Diabetes Center (DZD), Helmholtz Zentrum München, Neuherberg 85764, Germany
| | - Susanne Mandrup
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense 5230, Denmark
| | - Andreas Kjær
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark; Department of Clinical Physiology, Nuclear Medicine & PET and Cluster for Molecular Imaging, Rigshospitalet, Copenhagen 2200, Denmark
| | - Steven P Gygi
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Torben Hansen
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark
| | - Matthew P Gillum
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark
| | - Niels Grarup
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark
| | - Brice Emanuelli
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark
| | - Søren Nielsen
- Centre of Inflammation and Metabolism and Centre for Physical Activity Research, Rigshospitalet, University Hospital of Copenhagen, Copenhagen 2200, Denmark
| | - Camilla Scheele
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark; Centre of Inflammation and Metabolism and Centre for Physical Activity Research, Rigshospitalet, University Hospital of Copenhagen, Copenhagen 2200, Denmark
| | - Yu-Hua Tseng
- Section on Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215, USA
| | - Nils J Færgeman
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense 5230, Denmark
| | - Zachary Gerhart-Hines
- Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, Copenhagen 2200, Denmark; Department of Biomedical Sciences, University of Copenhagen, Copenhagen 2200, Denmark.
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Anglès d’Auriac MB, Sirevåg R. Multiplex PCR for the simultaneous detection of the Enterobacterial gene wecA, the Shiga Toxin genes (stx 1 and stx 2) and the Intimin gene (eae). BMC Res Notes 2018; 11:360. [PMID: 29880035 PMCID: PMC5992677 DOI: 10.1186/s13104-018-3457-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 05/31/2018] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES The aetiology of several human diarrhoeas has been increasingly associated with the presence of virulence factors rather than with the bacterial species hosting the virulence genes, exemplified by the sporadic emergence of new bacterial hosts. Two important virulence factors are the Shiga toxin (Stx) and the E. coli outer membrane protein (Eae) or intimin, encoded by the stx and eae genes, respectively. Although several polymerase chain reaction (PCR) protocols target these virulence genes, few aim at detecting all variants or have an internal amplification control (IAC) included in a multiplex assay. The objective of this work was to develop a simple multiplex PCR assay in order to detect all stx and eae variants, as well as to detect bacteria belonging to the Enterobacteriaceae, also used as an IAC. RESULTS The wecA gene coding for the production of the Enterobacterial Common Antigen was used to develop an Enterobacteriaceae specific qPCR. Universal primers for the detection of stx and eae were developed and linked to a wecA primer pair in a robust triplex PCR. In addition, subtyping of the stx genes was achieved by subjecting the PCR products to restriction digestion and semi-nested duplex PCR, providing a simple screening assay for human diarrhoea diagnostic.
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Affiliation(s)
- Marc B. Anglès d’Auriac
- Norwegian Institute for Water Research (NIVA), 0349 Oslo, Norway
- Department of Biosciences, University of Oslo, Box 1031, Blindern, 0316 Oslo, Norway
| | - Reidun Sirevåg
- Department of Biosciences, University of Oslo, Box 1031, Blindern, 0316 Oslo, Norway
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Xiang R, Liu BH, Zhang AY, Lei CW, Ye XL, Yang YX, Chen YP, Wang HN. Colocation of the Polymyxin Resistance Gene mcr-1 and a Variant of mcr-3 on a Plasmid in an Escherichia coli Isolate from a Chicken Farm. Antimicrob Agents Chemother 2018; 62:e00501-18. [PMID: 29760138 PMCID: PMC5971617 DOI: 10.1128/aac.00501-18] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 03/15/2018] [Accepted: 03/24/2018] [Indexed: 11/20/2022] Open
Abstract
A colistin-resistant Escherichia coli isolate from a commercial poultry farm in China carried two colistin resistance genes, mcr-1 and variant of mcr-3, in an IncP plasmid. The variant of the mcr-3 gene, named mcr-3.11, encoded two amino acid substitutions compared with the mcr-3 gene. A novel genetic structure, ISKpn40-mcr-3-dgkA-ISKpn40, might be the key element mediating the translocation of mcr-3 through the formation of a circular form. The mcr-1 and mcr-3 genes, which are colocated on a plasmid, might pose a huge threat to public health.
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Affiliation(s)
- Rong Xiang
- Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Bi-Hui Liu
- Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - An-Yun Zhang
- Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Chang-Wei Lei
- Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Xiao-Lan Ye
- Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Yan-Xian Yang
- Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Yan-Peng Chen
- Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Hong-Ning Wang
- Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, People's Republic of China
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Willet SG, Lewis MA, Miao ZF, Liu D, Radyk MD, Cunningham RL, Burclaff J, Sibbel G, Lo HYG, Blanc V, Davidson NO, Wang ZN, Mills JC. Regenerative proliferation of differentiated cells by mTORC1-dependent paligenosis. EMBO J 2018; 37:e98311. [PMID: 29467218 PMCID: PMC5881627 DOI: 10.15252/embj.201798311] [Citation(s) in RCA: 112] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 01/18/2018] [Accepted: 01/19/2018] [Indexed: 12/18/2022] Open
Abstract
In 1900, Adami speculated that a sequence of context-independent energetic and structural changes governed the reversion of differentiated cells to a proliferative, regenerative state. Accordingly, we show here that differentiated cells in diverse organs become proliferative via a shared program. Metaplasia-inducing injury caused both gastric chief and pancreatic acinar cells to decrease mTORC1 activity and massively upregulate lysosomes/autophagosomes; then increase damage associated metaplastic genes such as Sox9; and finally reactivate mTORC1 and re-enter the cell cycle. Blocking mTORC1 permitted autophagy and metaplastic gene induction but blocked cell cycle re-entry at S-phase. In kidney and liver regeneration and in human gastric metaplasia, mTORC1 also correlated with proliferation. In lysosome-defective Gnptab-/- mice, both metaplasia-associated gene expression changes and mTORC1-mediated proliferation were deficient in pancreas and stomach. Our findings indicate differentiated cells become proliferative using a sequential program with intervening checkpoints: (i) differentiated cell structure degradation; (ii) metaplasia- or progenitor-associated gene induction; (iii) cell cycle re-entry. We propose this program, which we term "paligenosis", is a fundamental process, like apoptosis, available to differentiated cells to fuel regeneration following injury.
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Affiliation(s)
- Spencer G Willet
- Division of Gastroenterology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA
| | - Mark A Lewis
- Division of Gastroenterology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA
| | - Zhi-Feng Miao
- Division of Gastroenterology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA
- Department of Surgical Oncology and General Surgery, The First Affiliated Hospital of China Medical University, Shenyang, China
| | - Dengqun Liu
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Combined Injury, College of Preventive Medicine, Third Military Medical University, Chongqing, China
| | - Megan D Radyk
- Division of Gastroenterology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA
| | - Rebecca L Cunningham
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA
| | - Joseph Burclaff
- Division of Gastroenterology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA
| | - Greg Sibbel
- Division of Gastroenterology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA
| | - Hei-Yong G Lo
- Division of Gastroenterology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA
| | - Valerie Blanc
- Division of Gastroenterology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA
| | - Nicholas O Davidson
- Division of Gastroenterology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA
| | - Zhen-Ning Wang
- Department of Surgical Oncology and General Surgery, The First Affiliated Hospital of China Medical University, Shenyang, China
| | - Jason C Mills
- Division of Gastroenterology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA
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Pogmore AR, Seistrup KH, Strahl H. The Gram-positive model organism Bacillus subtilis does not form microscopically detectable cardiolipin-specific lipid domains. Microbiology (Reading) 2018; 164:475-482. [PMID: 29504925 DOI: 10.1099/mic.0.000639] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Rather than being homogenous diffusion-dominated structures, biological membranes can exhibit areas with distinct composition and characteristics, commonly termed as lipid domains. Arguably the most comprehensively studied examples in bacteria are domains formed by cardiolipin, which have been functionally linked to protein targeting, the cell division process and the mode of action of membrane-targeting antimicrobials. Cardiolipin domains were originally identified in the Gram-negative model organism Escherichia coli based on preferential staining by the fluorescent membrane dye nonylacridine orange (NAO), and later reported to also exist in other Gram-negative and -positive bacteria. Recently, the lipid-specificity of NAO has been questioned based on studies conducted in E. coli. This prompted us to reanalyse cardiolipin domains in the Gram-positive model organism Bacillus subtilis. Here we show that logarithmically growing B. subtilis does not form microscopically detectable cardiolipin-specific lipid domains, and that NAO is not a specific stain for cardiolipin in this organism.
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Affiliation(s)
- Alex-Rose Pogmore
- Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, UK
| | - Kenneth H Seistrup
- Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, UK
| | - Henrik Strahl
- Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, UK
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47
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Zhang J, Chen L, Wang J, Yassin AK, Butaye P, Kelly P, Gong J, Guo W, Li J, Li M, Yang F, Feng Z, Jiang P, Song C, Wang Y, You J, Yang Y, Price S, Qi K, Kang Y, Wang C. Molecular detection of colistin resistance genes (mcr-1, mcr-2 and mcr-3) in nasal/oropharyngeal and anal/cloacal swabs from pigs and poultry. Sci Rep 2018; 8:3705. [PMID: 29487327 PMCID: PMC5829079 DOI: 10.1038/s41598-018-22084-4] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 02/16/2018] [Indexed: 12/18/2022] Open
Abstract
Antimicrobial resistance against colistin has emerged worldwide and is threatening the efficacy of colistin treatment of multi-resistant Gram-negative bacteria. In this study, PCRs were used to detect mcr genes (mcr-1, mcr-2, mcr-3) in 213 anal and 1,339 nasal swabs from pigs (n = 1,454) in nine provinces of China, and 1,696 cloacal and 1,647 oropharyngeal samples from poultry (n = 1,836) at live-bird markets in 24 provinces. The mcr-1 prevalences in pigs (79.2%) and geese (71.7%) were significantly higher than in chickens (31.8%), ducks (34.6%) and pigeons (13.1%). The mcr-2 prevalence in pigs was 56.3%, significantly higher than in chickens (5.5%), ducks (2.3%), geese (5.5%) and pigeons (0%). The mcr-3 prevalences in pigs (18.7%), ducks (13.8%) and geese (11.9%) were significantly higher than in chickens (5.2%) and pigeons (5.1%). In total, 173 pigs and three chickens were positive for all three mcr genes. The prevalences of the mcr were significantly higher in nasal/oropharyngeal swabs than in the anal /cloacal swabs. Phylogenetic studies identified 33 new mcr-2 variants and 12 new mcr-3 variants. This study demonstrates high prevalences of mcr in pigs and poultry in China, and indicates there is need for more thorough surveillance and control programs to prevent further selection of colistin resistance.
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Affiliation(s)
- Jilei Zhang
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China
| | - Li Chen
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China
| | - Jiawei Wang
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China
| | - Afrah Kamal Yassin
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China
- Department of Food Hygiene and safety, Faculty of Public and Environmental Health, Khartoum University, Khartoum, Sudan
| | - Patrick Butaye
- Department of Biosciences, Ross University School of Veterinary Medicine, PO Box 334, Basseterre, Saint Kitts and Nevis
- Department of Pathology, Bacteriology and Poultry diseases, Faculty of Veterinary Medicine, Ghent University, Ghent, Belgium
| | - Patrick Kelly
- Department of Biosciences, Ross University School of Veterinary Medicine, PO Box 334, Basseterre, Saint Kitts and Nevis
| | - Jiansen Gong
- Poultry Institute, Chinese Academy of Agricultural Sciences, Yangzhou, Jiangsu, China
| | - Weina Guo
- College of Animal Science, Anhui Science and Technology University, Bengbu, 230001, China
| | - Jing Li
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China
| | - Min Li
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China
| | - Feng Yang
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China
| | - Zhixing Feng
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-Products, Nanjing, 210014, China
| | - Ping Jiang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, 210095, China
| | - Chunlian Song
- Yunnan Agricultural University College of Animal Science & Technology, Kunming, Yunnan, 650201, China
| | - Yaoyao Wang
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China
| | - Jinfeng You
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China
| | - Yi Yang
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China
| | - Stuart Price
- College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Kezong Qi
- Anhui Province Key Laboratory of Veterinary Pathobiology and Disease Control, Anhui Agricultural University, Hefei, 230036, P.R. China
| | - Yuan Kang
- College of Veterinary Medicine, Auburn University, Auburn, AL, USA
| | - Chengming Wang
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Veterinary Medicine, Yangzhou, Jiangsu, 225009, P.R. China.
- College of Veterinary Medicine, Auburn University, Auburn, AL, USA.
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Tüysüz B, Kasapçopur Ö, Alkaya DU, Şahin S, Sözeri B, Yeşil G. Mucolipidosis type III gamma: Three novel mutation and genotype-phenotype study in eleven patients. Gene 2017; 642:398-407. [PMID: 29170090 DOI: 10.1016/j.gene.2017.11.052] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 11/07/2017] [Accepted: 11/17/2017] [Indexed: 11/18/2022]
Abstract
Mucolipidosis type III gamma (MLIII gamma) is a lysosomal storage disease characterized by joint stiffness, mild coarse face and corneal clouding, which becomes recognizable usually in childhood. Biallelic mutations in the GNPTG gene, which encode the γ subunit of the N-acetylglucosamine-1-phosphotransferase enzyme, are the underlying cause of MLIII gamma. The aim of this study is to evaluate the longitudinal findings and genotype of eleven patients from eight families with MLIII gamma and to establish a genotype-phenotype correlation. The most frequently observed initial finding was stiffness of finger joints, which detected in patients between 18month-olds and five year-olds. However, in four patients presented here, initial finding was knee pain or waddling gait, which started between six-16years of age. All patients also had variable degrees of stiffness on large joints. The longest follow up period was 16years while the shortest was three years and six months. We observed that the patients who had an early onset disease and severe joint stiffness had also rapidly progressive joint involvement mostly localized in hands, shoulders, and hip. However; the patients with late onset and/or mild joint stiffness experienced slowly progressive symptoms. Most patients dropped in their growth curve in time and the ones who were severely affected reached the final height below the third centile. Seven disease-causing mutations, three of them novel, were detected in GNPTG gene. According to our clinical observations c.493_494insC and c.283_284insC mutations lead to a severe phenotype and c.196C>T, c.347_349del, c.652_655delTACT and c.445delG/c.367A>G mutations seemed to generate a milder phenotype.
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Affiliation(s)
- Beyhan Tüysüz
- Department of Pediatric Genetics, Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey.
| | - Özgür Kasapçopur
- Department of Pediatric Rheumatology, Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
| | - Dilek Uludağ Alkaya
- Department of Pediatric Genetics, Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
| | - Sezgin Şahin
- Department of Pediatric Rheumatology, Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
| | - Betül Sözeri
- Department of Pediatric Rheumatology, Ege University Medical School, Izmir, Turkey
| | - Gözde Yeşil
- Department of Medical Genetics, BezmialemVakif University, Istanbul, Turkey
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49
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Badamchi A, Masoumi H, Javadinia S, Asgarian R, Tabatabaee A. Molecular detection of six virulence genes in Pseudomonas aeruginosa isolates detected in children with urinary tract infection. Microb Pathog 2017; 107:44-47. [PMID: 28315724 DOI: 10.1016/j.micpath.2017.03.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2016] [Revised: 03/01/2017] [Accepted: 03/06/2017] [Indexed: 11/19/2022]
Abstract
Although a vast majority of Urinary tract infections (UTIs) are caused by E. coli, epidemiological reports have indicated an increasing rate of such infections caused by some other opportunistic organisms including Pseudomonas aeruginosa. Antimicrobial susceptibility and pathogenesis mechanisms of P. aeruginosa are poorly understood. The aim of this study was to detect some virulence factor genes and antimicrobial susceptibility patterns of P. aeruginosa isolates detected in patients with UTI, in children hospital of Tehran, Tehran, Iran. Eighty-four Pseudomonas aeruginosa were isolated. Then, the presence of six virulence genes, in the genome of the isolates was evaluated using PCR amplifications techniques. Finally, antimicrobial susceptibility pattern of the isolates was determined by disk diffusion method. According to the results, lasB was the most prevalent virulence gene that could be detected in the P. aeruginosa isolates (92.9%) used in this study. This was followed by aprA (81.2%), toxA (69.4%), and algD (60%) genes. Two genes, plcH and plcN, were detected in about 38.8% of the isolates. Additionally, Imipenem was found as the most active agent against the P. aeruginosa isolates used in this research. However, Cefotaxime resistance was observed in most of the isolates. Our P. aeruginosa isolates exhibited a great degree of heterogeneity not only in their virulence genes but also in their antimicrobial susceptibility profiles. Imipenem therapies tend to be among the best choices in the management of UTI caused by P. aeruginosa. As a conclusion, assessment of antimicrobial susceptibility pattern and also analyzing the virulence factors can be highly helpful to develop effective treatment strategies against P. aeruginosa urinary infections.
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Affiliation(s)
- Ali Badamchi
- Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Hossein Masoumi
- Research Center of Pediatric Infectious Diseases, Rasoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - Shima Javadinia
- Research Center of Pediatric Infectious Diseases, Rasoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - Ramin Asgarian
- Research Center of Pediatric Infectious Diseases, Rasoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - Azardokht Tabatabaee
- Research Center of Pediatric Infectious Diseases, Rasoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran.
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50
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Mitsutake S. [Dynamic modification of sphingomyelin evokes a novel membrane dynamism in the plasma membrane]. Seikagaku 2017; 89:86-89. [PMID: 29624964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
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