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Arreola J, López-Romero AE, Huerta M, Guzmán-Hernández ML, Pérez-Cornejo P. Insights into the function and regulation of the calcium-activated chloride channel TMEM16A. Cell Calcium 2024; 121:102891. [PMID: 38772195 DOI: 10.1016/j.ceca.2024.102891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 04/23/2024] [Accepted: 04/23/2024] [Indexed: 05/23/2024]
Abstract
The TMEM16A channel, a member of the TMEM16 protein family comprising chloride (Cl-) channels and lipid scramblases, is activated by the free intracellular Ca2+ increments produced by inositol 1,4,5-trisphosphate (IP3)-induced Ca2+ release after GqPCRs or Ca2+ entry through cationic channels. It is a ubiquitous transmembrane protein that participates in multiple physiological functions essential to mammals' lives. TMEM16A structure contains two identical 10-segment monomers joined at their transmembrane segment 10. Each monomer harbours one independent hourglass-shaped pore gated by Ca2+ ligation to an orthosteric site adjacent to the pore and controlled by two gates. The orthosteric site is created by assembling negatively charged glutamate side chains near the pore´s cytosolic end. When empty, this site generates an electrostatic barrier that controls channel rectification. In addition, an isoleucine-triad forms a hydrophobic gate at the boundary of the cytosolic vestibule and the inner side of the neck. When the cytosolic Ca2+ rises, one or two Ca2+ ions bind to the orthosteric site in a voltage (V)-dependent manner, thus neutralising the electrostatic barrier and triggering an allosteric gating mechanism propagating via transmembrane segment 6 to the hydrophobic gate. These coordinated events lead to pore opening, allowing the Cl- flux to ensure the physiological response. The Ca2+-dependent function of TMEM16A is highly regulated. Anions with higher permeability than Cl- facilitate V dependence by increasing the Ca2+ sensitivity, intracellular protons can replace Ca2+ and induce channel opening, and phosphatidylinositol 4,5-bisphosphate bound to four cytosolic sites likely maintains Ca2+ sensitivity. Additional regulation is afforded by cytosolic proteins, most likely by phosphorylation and protein-protein interaction mechanisms.
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Affiliation(s)
- Jorge Arreola
- Jorge Arreola, Physics Institute of Universidad Autónoma de San Luis Potosí. Av. Parque Chapultepec 1570, Privadas del Pedregal, 78295 San Luis Potosí, SLP., Mexico.
| | - Ana Elena López-Romero
- Jorge Arreola, Physics Institute of Universidad Autónoma de San Luis Potosí. Av. Parque Chapultepec 1570, Privadas del Pedregal, 78295 San Luis Potosí, SLP., Mexico
| | - Miriam Huerta
- Jorge Arreola, Physics Institute of Universidad Autónoma de San Luis Potosí. Av. Parque Chapultepec 1570, Privadas del Pedregal, 78295 San Luis Potosí, SLP., Mexico
| | - María Luisa Guzmán-Hernández
- Catedrática CONAHCYT, Department of Physiology and Biophysics, School of Medicine, Universidad Autónoma de San Luis Potosí. Ave. V. Carranza 2905, Los Filtros, San Luis Potosí, SLP 78210, Mexico
| | - Patricia Pérez-Cornejo
- Department of Physiology and Biophysics, School of Medicine, Universidad Autónoma de San Luis Potosí. Ave. V. Carranza 2905, Los Filtros, San Luis Potosí, SLP 78210, Mexico
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Xie MX, Lai RC, Xiao YB, Zhang X, Cao XY, Tian XY, Chen AN, Chen ZY, Cao Y, Li X, Zhang XL. Endophilin A2 controls touch and mechanical allodynia via kinesin-mediated Piezo2 trafficking. Mil Med Res 2024; 11:17. [PMID: 38475827 DOI: 10.1186/s40779-024-00520-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 02/02/2024] [Indexed: 03/14/2024] Open
Abstract
BACKGROUND Tactile and mechanical pain are crucial to our interaction with the environment, yet the underpinning molecular mechanism is still elusive. Endophilin A2 (EndoA2) is an evolutionarily conserved protein that is documented in the endocytosis pathway. However, the role of EndoA2 in the regulation of mechanical sensitivity and its underlying mechanisms are currently unclear. METHODS Male and female C57BL/6 mice (8-12 weeks) and male cynomolgus monkeys (7-10 years old) were used in our experiments. Nerve injury-, inflammatory-, and chemotherapy-induced pathological pain models were established for this study. Behavioral tests of touch, mechanical pain, heat pain, and cold pain were performed in mice and nonhuman primates. Western blotting, immunostaining, co-immunoprecipitation, proximity ligation and patch-clamp recordings were performed to gain insight into the mechanisms. RESULTS The results showed that EndoA2 was primarily distributed in neurofilament-200-positive (NF200+) medium-to-large diameter dorsal root ganglion (DRG) neurons of mice and humans. Loss of EndoA2 in mouse NF200+ DRG neurons selectively impaired the tactile and mechanical allodynia. Furthermore, EndoA2 interacted with the mechanically sensitive ion channel Piezo2 and promoted the membrane trafficking of Piezo2 in DRG neurons. Moreover, as an adaptor protein, EndoA2 also bound to kinesin family member 5B (KIF5B), which was involved in the EndoA2-mediated membrane trafficking process of Piezo2. Loss of EndoA2 in mouse DRG neurons damaged Piezo2-mediated rapidly adapting mechanically activated currents, and re-expression of EndoA2 rescued the MA currents. In addition, interference with EndoA2 also suppressed touch sensitivity and mechanical hypersensitivity in nonhuman primates. CONCLUSIONS Our data reveal that the KIF5B/EndoA2/Piezo2 complex is essential for Piezo2 trafficking and for sustaining transmission of touch and mechanical hypersensitivity signals. EndoA2 regulates touch and mechanical allodynia via kinesin-mediated Piezo2 trafficking in sensory neurons. Our findings identify a potential new target for the treatment of mechanical pain.
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Affiliation(s)
- Man-Xiu Xie
- Department of Anesthesiology, Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Guangdong Provincial Clinical Research Center for Cancer, Guangzhou, 510060, China
| | - Ren-Chun Lai
- Department of Anesthesiology, Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Guangdong Provincial Clinical Research Center for Cancer, Guangzhou, 510060, China
| | - Yi-Bin Xiao
- Medical Research Institute, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, 510080, China
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-Sen University, Guangzhou, 510080, China
| | - Xi Zhang
- Medical Research Institute, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, 510080, China
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-Sen University, Guangzhou, 510080, China
| | - Xian-Ying Cao
- Engineering Technology Research Center for Elderly Health Management in Hainan Province, Haikou, 571137, China
- College of Food Science and Technology, Hainan University, Haikou, 570228, China
| | - Xiao-Yu Tian
- College of Food Science and Technology, Hainan University, Haikou, 570228, China
| | - An-Nan Chen
- Medical Research Institute, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, 510080, China
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-Sen University, Guangzhou, 510080, China
| | - Zi-Yi Chen
- Medical Research Institute, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, 510080, China
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-Sen University, Guangzhou, 510080, China
| | - Yan Cao
- College of Food Science and Technology, Hainan University, Haikou, 570228, China
| | - Xiao Li
- College of Food Science and Technology, Hainan University, Haikou, 570228, China
| | - Xiao-Long Zhang
- Medical Research Institute, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, 510080, China.
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Li Y, Dinkel H, Pakalniskyte D, Busley AV, Cyganek L, Zhong R, Zhang F, Xu Q, Maywald L, Aweimer A, Huang M, Liao Z, Meng Z, Yan C, Prädel T, Rose L, Moscu‐Gregor A, Hohn A, Yang Z, Qiao L, Mügge A, Zhou X, Akin I, El‐Battrawy I. Novel insights in the pathomechanism of Brugada syndrome and fever-related type 1 ECG changes in a preclinical study using human-induced pluripotent stem cell-derived cardiomyocytes. Clin Transl Med 2023; 13:e1130. [PMID: 36881552 PMCID: PMC9990896 DOI: 10.1002/ctm2.1130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 11/13/2022] [Accepted: 11/17/2022] [Indexed: 03/08/2023] Open
Abstract
BACKGROUND Brugada syndrome (BrS) is causing sudden cardiac death (SCD) mainly at young age. Studying the underlying mechanisms associated with BrS type I electrocardiogram (ECG) changes in the presence of fever and roles of autophagy for BrS remains lacking. OBJECTIVES We sought to study the pathogenic role of an SCN5A gene variant for BrS with fever-induced type 1 ECG phenotype. In addition, we studied the role of inflammation and autophagy in the pathomechanism of BrS. METHODS Human-induced pluripotent stem cell (hiPSC) lines from a BrS patient harboring a pathogenic variant (c.3148G>A/p. Ala1050Thr) in SCN5A and two healthy donors (non-BrS) and a CRISPR/Cas9 site-corrected cell line (BrS-corr) were differentiated into cardiomyocytes (hiPSC-CMs) for the study. RESULTS Reductions of Nav 1.5 expression, peak sodium channel current (INa ) and upstroke velocity (Vmax ) of action potentials with an increase in arrhythmic events were detected in BrS compared to non-BrS and BrS-corr cells. Increasing the cell culture temperature from 37 to 40°C (fever-like state) exacerbated the phenotypic changes in BrS cells. The fever-effects were enhanced by protein kinase A (PKA) inhibitor but reversed by PKA activator. Lipopolysaccharides (LPS) but not increased temperature up to 40°C enhanced the autophagy level in BrS-hiPSC-CMs by increasing reactive oxidative species and inhibiting PI3K/AKT signalling, and hence exacerbated the phenotypic changes. LPS enhanced high temperature-related effect on peak INa shown in BrS hiPSC-CMs. Effects of LPS and high temperature were not detected in non-BrS cells. CONCLUSIONS The study demonstrated that the SCN5A variant (c.3148G>A/p.Ala1050Thr) caused loss-of-function of sodium channels and increased the channel sensitivity to high temperature and LPS challenge in hiPSC-CMs from a BrS cell line with this variant but not in two non-BrS hiPSC-CM lines. The results suggest that LPS may exacerbate BrS phenotype via enhancing autophagy, whereas fever may exacerbate BrS phenotype via inhibiting PKA-signalling in BrS cardiomyocytes with but probably not limited to this variant.
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Affiliation(s)
- Yingrui Li
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
- DZHK (German Center for Cardiovascular Research)Partner SiteHeidelberg‐Mannheim and GöttingenMannheimGermany
| | - Hendrik Dinkel
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
- DZHK (German Center for Cardiovascular Research)Partner SiteHeidelberg‐Mannheim and GöttingenMannheimGermany
| | - Dalia Pakalniskyte
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
- DZHK (German Center for Cardiovascular Research)Partner SiteHeidelberg‐Mannheim and GöttingenMannheimGermany
| | - Alexandra Viktoria Busley
- DZHK (German Center for Cardiovascular Research)Partner SiteHeidelberg‐Mannheim and GöttingenMannheimGermany
- Stem Cell UnitClinic for Cardiology and PneumologyUniversity Medical Center GöttingenGöttingenGermany
| | - Lukas Cyganek
- DZHK (German Center for Cardiovascular Research)Partner SiteHeidelberg‐Mannheim and GöttingenMannheimGermany
- Stem Cell UnitClinic for Cardiology and PneumologyUniversity Medical Center GöttingenGöttingenGermany
| | - Rujia Zhong
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
| | - Feng Zhang
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
| | - Qiang Xu
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
- Key Laboratory of Medical Electrophysiology of Ministry of Education and Medical Electrophysiological Key Laboratory of Sichuan ProvinceInstitute of Cardiovascular ResearchSouthwest Medical UniversityLuzhouChina
| | - Lasse Maywald
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
- DZHK (German Center for Cardiovascular Research)Partner SiteHeidelberg‐Mannheim and GöttingenMannheimGermany
| | - Assem Aweimer
- Department of Cardiology and AngiologyBergmannsheil University HospitalsRuhr University of BochumBochumGermany
| | - Mengying Huang
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
| | - Zhenxing Liao
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
| | - Zenghui Meng
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
| | - Chen Yan
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
| | - Timo Prädel
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
- DZHK (German Center for Cardiovascular Research)Partner SiteHeidelberg‐Mannheim and GöttingenMannheimGermany
| | - Lena Rose
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
| | | | - Alyssa Hohn
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
| | - Zhen Yang
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
| | - Lin Qiao
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
| | - Andreas Mügge
- Department of Cardiology and AngiologyBergmannsheil University HospitalsRuhr University of BochumBochumGermany
| | - Xiaobo Zhou
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
- DZHK (German Center for Cardiovascular Research)Partner SiteHeidelberg‐Mannheim and GöttingenMannheimGermany
- Key Laboratory of Medical Electrophysiology of Ministry of Education and Medical Electrophysiological Key Laboratory of Sichuan ProvinceInstitute of Cardiovascular ResearchSouthwest Medical UniversityLuzhouChina
| | - Ibrahim Akin
- First Department of MedicineFaculty of MedicineUniversity Medical Centre Mannheim (UMM)Heidelberg UniversityMannheimGermany
- DZHK (German Center for Cardiovascular Research)Partner SiteHeidelberg‐Mannheim and GöttingenMannheimGermany
| | - Ibrahim El‐Battrawy
- Department of Cardiology and AngiologyBergmannsheil University HospitalsRuhr University of BochumBochumGermany
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Adipose-specific deletion of the cation channel TRPM7 inhibits TAK1 kinase-dependent inflammation and obesity in male mice. Nat Commun 2023; 14:491. [PMID: 36717580 PMCID: PMC9887063 DOI: 10.1038/s41467-023-36154-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 01/18/2023] [Indexed: 01/31/2023] Open
Abstract
Chronic inflammation of white adipose tissue is a key link between obesity and the associated metabolic syndrome. Transient receptor potential melastatin-like 7 (TRPM7) is known to be related to inflammation; however, the role of TRPM7 in adipocyte phenotype and function in obesity remains unclear. Here, we observe that the activation of adipocyte TRPM7 plays an essential role in pro-inflammatory responses. Adult male mice are used in our experiments. Adipocyte-specific deficiency in TRPM7 attenuates the pro-inflammatory phenotype, improves glucose homeostasis, and suppresses weight gain in mice fed a high-fat diet. Mechanistically, the pro-inflammatory effect of TRPM7 is dependent on Ca2+ signaling. Ca2+ influx initiated by TRPM7 enhances transforming growth factor-β activated kinase 1 activation via the co-regulation of calcium/calmodulin-dependent protein kinase II and tumor necrosis factor receptor-associated factor 6, leading to exacerbated nuclear factor kappa B signaling. Additionally, obese mice treated with TRPM7 inhibitor are protected against obesity and insulin resistance. Our results demonstrate TRPM7 as a factor in the development of adipose inflammation that regulates insulin sensitivity in obesity.
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Guo J, Song Z, Yu J, Li C, Jin C, Duan W, Liu X, Liu Y, Huang S, Tuo Y, Pei F, Jian Z, Zhou P, Zheng S, Zou Z, Zhang F, Gong Q, Liang S. Hepatocyte-specific TMEM16A deficiency alleviates hepatic ischemia/reperfusion injury via suppressing GPX4-mediated ferroptosis. Cell Death Dis 2022; 13:1072. [PMID: 36572666 PMCID: PMC9792590 DOI: 10.1038/s41419-022-05518-w] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 12/10/2022] [Accepted: 12/13/2022] [Indexed: 12/28/2022]
Abstract
Ischemia/reperfusion (I/R)-induced liver injury with severe cell death is a major complication of liver transplantation. Transmembrane member 16A (TMEM16A), a component of hepatocyte Ca2+-activated chloride channel, has been implicated in a variety of liver diseases. However, its role in hepatic I/R injury remains unknown. Here, mice with hepatocyte-specific TMEM16A knockout or overexpression were generated to examine the effect of TMEM16A on hepatic I/R injury. TMEM16A expression increased in liver samples from patients and mice with I/R injury, which was correlated with liver damage progression. Hepatocyte-specific TMEM16A knockout alleviated I/R-induced liver damage in mice, ameliorating inflammation and ferroptotic cell death. However, mice with hepatic TMEM16A overexpression showed the opposite phenotype. In addition, TMEM16A ablation decreased inflammatory responses and ferroptosis in hepatocytes upon hypoxia/reoxygenation insult in vitro, whereas TMEM16A overexpression promoted the opposite effects. The ameliorating effects of TMEM16A knockout on hepatocyte inflammation and cell death were abolished by chemically induced ferroptosis, whereas chemical inhibition of ferroptosis reversed the potentiated role of TMEM16A in hepatocyte injury. Mechanistically, TMEM16A interacted with glutathione peroxidase 4 (GPX4) to induce its ubiquitination and degradation, thereby enhancing ferroptosis. Disruption of TMEM16A-GPX4 interaction abrogated the effects of TMEM16A on GPX4 ubiquitination, ferroptosis, and hepatic I/R injury. Our results demonstrate that TMEM16A exacerbates hepatic I/R injury by promoting GPX4-dependent ferroptosis. TMEM16A-GPX4 interaction and GPX4 ubiquitination are therefore indispensable for TMEM16A-regulated hepatic I/R injury, suggesting that blockades of TMEM16A-GPX4 interaction or TMEM16A inhibition in hepatocytes may represent promising therapeutic strategies for acute liver injury.
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Affiliation(s)
- Jiawei Guo
- grid.410654.20000 0000 8880 6009Department of Pharmacology, School of Medicine, Yangtze University, Jingzhou, China
| | - Zihao Song
- grid.410654.20000 0000 8880 6009Department of Immunology, School of Medicine, Yangtze University, Jingzhou, China
| | - Jie Yu
- grid.284723.80000 0000 8877 7471Department of General Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Chengyi Li
- grid.410654.20000 0000 8880 6009Department of Immunology, School of Medicine, Yangtze University, Jingzhou, China
| | - Chenchen Jin
- grid.508040.90000 0004 9415 435XCenter for Neuro-Metabolism and Regeneration Research, The Bioland Laboratory, Guangzhou, China
| | - Wei Duan
- grid.410654.20000 0000 8880 6009Department of Oncology, Jingzhou Hospital Affiliated to Yangtze University, Jingzhou, China
| | - Xiu Liu
- grid.416466.70000 0004 1757 959XDepartment of Cardiovascular Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yingying Liu
- grid.413428.80000 0004 1757 8466Guangzhou Women and Children’s Medical Center, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou, China
| | - Shuai Huang
- grid.412534.5Department of Orthopaedic Surgery, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Yonghua Tuo
- grid.412534.5Department of Neurosurgery, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Fei Pei
- grid.12981.330000 0001 2360 039XDepartment of Critical Care Medicine, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China ,Guangdong Clinical Research Center for Critical Care Medicine, Guangzhou, China
| | - Zhengyang Jian
- Center For Drug Inspection of Guizhou Medical Products Administration, Guiyang, China
| | - Pengyu Zhou
- grid.416466.70000 0004 1757 959XDepartment of Cardiovascular Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Shaoyi Zheng
- grid.416466.70000 0004 1757 959XDepartment of Cardiovascular Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Zhaowei Zou
- grid.284723.80000 0000 8877 7471Department of General Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Feng Zhang
- grid.34477.330000000122986657Department of Radiology, University of Washington School of Medicine, Seattle, WA USA
| | - Quan Gong
- grid.410654.20000 0000 8880 6009Department of Immunology, School of Medicine, Yangtze University, Jingzhou, China
| | - Sijia Liang
- grid.12981.330000 0001 2360 039XDepartment of Pharmacology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
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Li XY, Lv XF, Huang CC, Sun L, Ma MM, Liu C, Guan YY. LRRC8A is essential for volume-regulated anion channel in smooth muscle cells contributing to cerebrovascular remodeling during hypertension. Cell Prolif 2021; 54:e13146. [PMID: 34725866 PMCID: PMC8666279 DOI: 10.1111/cpr.13146] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 09/13/2021] [Accepted: 10/06/2021] [Indexed: 12/28/2022] Open
Abstract
Objectives Recent studies revealed LRRC8A to be an essential component of volume‐regulated anion channel (VRAC), which regulates cellular volume homeostasis. However, evidence for the contribution of LRRC8A‐dependent VRAC activity in vascular smooth muscle cells (VSMCs) is still lacking, and the relevant functional role of LRRC8A in VSMCs remains unknown. The primary goal of this study was to elucidate the role of LRRC8A in VRAC activity in VSMCs and the functional role of LRRC8A in cerebrovascular remodeling during hypertension. Materials and Methods siRNA‐mediated knockdown and adenovirus‐mediated overexpression of LRRC8A were used to elucidate the electrophysiological properties of LRRC8A in basilar smooth muscle cells (BASMCs). A smooth muscle–specific overexpressing transgenic mouse model was used to investigate the functional role of LRRC8A in cerebrovascular remodeling. Results LRRC8A is essential for volume‐regulated chloride current (ICl, Vol) in BASMCs. Overexpression of LRRC8A induced a voltage‐dependent Cl− current independently of hypotonic stimulation. LRRC8A regulated BASMCs proliferation through activation of WNK1/PI3K‐p85/AKT axis. Smooth muscle‐specific upregulation of LRRC8A aggravated Angiotensin II‐induced cerebrovascular remodeling in mice. Conclusions LRRC8A is an essential component of VRAC and is required for cell volume homeostasis during osmotic challenge in BASMCs. Smooth muscle specific overexpression of LRRC8A increases BASMCs proliferation and substantially aggravates basilar artery remodeling, revealing a potential therapeutic target for vascular remodeling in hypertension.
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Affiliation(s)
- Xiang-Yu Li
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Key Laboratory of Drug Monitoring and Control, Drug Intelligence and Forensic Center, Ministry of Public Security, Beijing, China
| | - Xiao-Fei Lv
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Cheng-Cui Huang
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Department of Pharmacy, the Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Lu Sun
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.,Department of Pharmacy, Division of Life Sciences and Medicine, the First Affiliated Hospital of USTC, University of Science and Technology of China, Hefei, China
| | - Ming-Ming Ma
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Canzhao Liu
- Department of Cardiovascular Medicine, Translational Medicine Research Center, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Yong-Yuan Guan
- Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
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Contribution of podocyte inflammatory exosome release to glomerular inflammation and sclerosis during hyperhomocysteinemia. Biochim Biophys Acta Mol Basis Dis 2021; 1867:166146. [PMID: 33862145 DOI: 10.1016/j.bbadis.2021.166146] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/31/2021] [Accepted: 04/05/2021] [Indexed: 01/08/2023]
Abstract
The nucleotide-binding oligomerization domain-like receptor containing pyrin domain 3 (NLRP3) inflammasome has been implicated in podocyte injury and glomerular sclerosis in response to hyperhomocysteinemia (hHcy). However, it remains unknown how the products of NLRP3 inflammasome in cytoplasm are secreted out of podocytes. In the present study, we tested whether exosome release serves as a critical mechanism to mediate the action of NLRP3 inflammasome activation in hHcy-induced glomerular injury. By various approaches, we found that hHcy induced NLRP3 inflammasome activation and neutrophil infiltration in glomeruli of WT/WT mice. Lysosome-MVB interaction in glomeruli remarkably decreased in WT/WT mice fed with FF diet, leading to elevation of urinary exosome excretion of these mice. Podocyte-derived exosomes containing pro-inflammatory cytokines increased in urine of WT/WT mice in response to hHcy. The release of inflammatory exosomes from podocytes was prevented by Smpd1 gene deletion but enhanced by podocyte-specific Smpd1 gene overexpression (Smpd1 encodes Asm in mice). Pathologically, hHcy-induced podocyte injury and glomerular sclerosis were blocked by Smpd1 gene knockout but amplified by podocyte-specific Smpd1 gene overexpression. Taken together, our results suggest that Asm-ceramide signaling pathway contributes to NLRP3 inflammasome activation and robust release of inflammatory exosomes in podocytes during hHcy, which together trigger local glomerular inflammation and sclerosis.
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Zhang SL, Li ZY, Wang DS, Xu TY, Fan MB, Cheng MH, Miao CY. Aggravated ulcerative colitis caused by intestinal Metrnl deficiency is associated with reduced autophagy in epithelial cells. Acta Pharmacol Sin 2020; 41:763-770. [PMID: 31949292 PMCID: PMC7471395 DOI: 10.1038/s41401-019-0343-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 12/02/2019] [Indexed: 01/26/2023] Open
Abstract
Metrnl is a newly identified secreted protein highly expressed in the intestinal epithelium. This study aimed to explore the role and mechanism of intestinal epithelial Metrnl in ulcerative colitis. Metrnl-/- (intestinal epithelial cell-specific Metrnl knockout) mice did not display any phenotypes of colitis under basal conditions. However, under administration of 3% dextran sodium sulfate (DSS) drinking water, colitis was more severe in Metrnl-/- mice than in WT mice, as indicated by comparisons of body weight loss, the presence of occult or gross blood per rectum, stool consistency, shrinkage in the colon, intestinal damage, and serum levels of inflammatory factors. DSS-induced colitis activated autophagy in the colon. This activation was partially inhibited by intestinal epithelial Metrnl deficiency, as indicated by a decrease in Beclin-1 and LC3-II/I and an increase in p62 in DSS-treated Metrnl-/- mice compared with WT mice. These phenomena were further confirmed by observation of autophagosomes and immunofluorescence staining for LC3 in epithelial cells. The autophagy-related AMPK-mTOR-p70S6K pathway was also activated in DSS-induced colitis, and this pathway was partially blocked by intestinal epithelial Metrnl deficiency, as indicated by a decrease in AMPK phosphorylation and an increase in mTOR and p70S6K phosphorylation in DSS-treated Metrnl-/- mice compared with WT mice. Therefore, Metrnl deficiency deteriorated ulcerative colitis at least partially through inhibition of autophagy via the AMPK-mTOR-p70S6K pathway, suggesting that Metrnl is a therapeutic target for ulcerative colitis.
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Centeio R, Cabrita I, Benedetto R, Talbi K, Ousingsawat J, Schreiber R, Sullivan JK, Kunzelmann K. Pharmacological Inhibition and Activation of the Ca 2+ Activated Cl - Channel TMEM16A. Int J Mol Sci 2020; 21:ijms21072557. [PMID: 32272686 PMCID: PMC7177308 DOI: 10.3390/ijms21072557] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 03/26/2020] [Accepted: 04/02/2020] [Indexed: 12/14/2022] Open
Abstract
TMEM16A is a Ca2+ activated Cl− channel with important functions in airways, intestine, and other epithelial organs. Activation of TMEM16A is proposed as a therapy in cystic fibrosis (CF) to reinstall airway Cl− secretion and to enhance airway surface liquid (ASL). This CFTR-agnostic approach is thought to improve mucociliary clearance and lung function in CF. This could indeed improve ASL, however, mucus release and airway contraction may also be induced by activators of TMEM16A, particularly in inflamed airways of patients with asthma, COPD, or CF. Currently, both activators and inhibitors of TMEM16A are developed and examined in different types of tissues. Here we compare activation and inhibition of endogenous and overexpressed TMEM16A and analyze potential off-target effects. The three well-known blockers benzbromarone, niclosamide, and Ani9 inhibited both TMEM16A and ATP-induced Ca2+ increase by variable degrees, depending on the cell type. Niclosamide, while blocking Ca2+ activated TMEM16A, also induced a subtle but significant Ca2+ store release and inhibited store-operated Ca2+ influx. Niclosamide, benzbromarone and Ani9 also affected TMEM16F whole cell currents, indicating limited specificity for these inhibitors. The compounds Eact, cinnamaldehyde, and melittin, as well as the phosphatidylinositol diC8-PIP2 are the reported activators of TMEM16A. However, the compounds were unable to activate endogenous TMEM16A in HT29 colonic epithelial cells. In contrast, TMEM16A overexpressed in HEK293 cells was potently stimulated by these activators. We speculate that overexpressed TMEM16A might have a better accessibility to intracellular Ca2+, which causes spontaneous activity even at basal intracellular Ca2+ concentrations. Small molecules may therefore potentiate pre-stimulated TMEM16A currents, but may otherwise fail to activate silent endogenous TMEM16A.
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Affiliation(s)
- Raquel Centeio
- Physiological Institute, University of Regensburg, D-93053 Regensburg, Germany; (R.C.); (I.C.); (R.B.); (K.T.); (J.O.); (R.S.)
| | - Inês Cabrita
- Physiological Institute, University of Regensburg, D-93053 Regensburg, Germany; (R.C.); (I.C.); (R.B.); (K.T.); (J.O.); (R.S.)
| | - Roberta Benedetto
- Physiological Institute, University of Regensburg, D-93053 Regensburg, Germany; (R.C.); (I.C.); (R.B.); (K.T.); (J.O.); (R.S.)
| | - Khaoula Talbi
- Physiological Institute, University of Regensburg, D-93053 Regensburg, Germany; (R.C.); (I.C.); (R.B.); (K.T.); (J.O.); (R.S.)
| | - Jiraporn Ousingsawat
- Physiological Institute, University of Regensburg, D-93053 Regensburg, Germany; (R.C.); (I.C.); (R.B.); (K.T.); (J.O.); (R.S.)
| | - Rainer Schreiber
- Physiological Institute, University of Regensburg, D-93053 Regensburg, Germany; (R.C.); (I.C.); (R.B.); (K.T.); (J.O.); (R.S.)
| | | | - Karl Kunzelmann
- Physiological Institute, University of Regensburg, D-93053 Regensburg, Germany; (R.C.); (I.C.); (R.B.); (K.T.); (J.O.); (R.S.)
- * Correspondence: ; Tel.: +49-(0)941-943-4302; Fax: +49-(0)941-943-4315
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Lv XF, Zhang YJ, Liu X, Zheng HQ, Liu CZ, Zeng XL, Li XY, Lin XC, Lin CX, Ma MM, Zhang FR, Shang JY, Zhou JG, Liang SJ, Guan YY. TMEM16A ameliorates vascular remodeling by suppressing autophagy via inhibiting Bcl-2-p62 complex formation. Am J Cancer Res 2020; 10:3980-3993. [PMID: 32226533 PMCID: PMC7086348 DOI: 10.7150/thno.41028] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 02/13/2020] [Indexed: 12/25/2022] Open
Abstract
Rationale: Transmembrane member 16A (TMEM16A) is a component of calcium-activated chloride channels that regulate vascular smooth muscle cell (SMC) proliferation and remodeling. Autophagy, a highly conserved cellular catabolic process in eukaryotes, exerts important physiological functions in vascular SMCs. In the current study, we investigated the relationship between TMEM16A and autophagy during vascular remodeling. Methods: We generated a transgenic mouse that overexpresses TMEM16A specifically in vascular SMCs to verify the role of TMEM16A in vascular remodeling. Techniques employed included immunofluorescence, electron microscopy, co-immunoprecipitation, and Western blotting. Results: Autophagy was activated in aortas from angiotensin II (AngII)-induced hypertensive mice with decreased TMEM16A expression. The numbers of light chain 3B (LC3B)-positive puncta in aortas correlated with the medial cross-sectional aorta areas and TMEM16A expression during hypertension. SMC-specific TMEM16A overexpression markedly inhibited AngII-induced autophagy in mouse aortas. Moreover, in mouse aortic SMCs (MASMCs), AngII-induced autophagosome formation and autophagic flux were blocked by TMEM16A upregulation and were promoted by TMEM16A knockdown. The effect of TMEM16A on autophagy was independent of the mTOR pathway, but was associated with reduced kinase activity of the vacuolar protein sorting 34 (VPS34) enzyme. Overexpression of VPS34 attenuated the effect of TMEM16A overexpression on MASMC proliferation, while the effect of TMEM16A downregulation was abrogated by a VPS34 inhibitor. Further, co-immunoprecipitation assays revealed that TMEM16A interacts with p62. TMEM16A overexpression inhibited AngII-induced p62-Bcl-2 binding and enhanced Bcl-2-Beclin-1 interactions, leading to suppression of Beclin-1/VPS34 complex formation. However, TMEM16A downregulation showed the opposite effects. Conclusion: TMEM16A regulates the four-way interaction between p62, Bcl-2, Beclin-1, and VPS34, and coordinately prevents vascular autophagy and remodeling.
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