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Shah DS, Nisr RB, Krasteva‐Christ G, Hundal HS. Caveolin-3 loss linked with the P104L LGMD-1C mutation modulates skeletal muscle mTORC1 signalling and cholesterol homeostasis. J Cachexia Sarcopenia Muscle 2023; 14:2310-2326. [PMID: 37671684 PMCID: PMC10570080 DOI: 10.1002/jcsm.13317] [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: 02/06/2023] [Revised: 07/20/2023] [Accepted: 07/31/2023] [Indexed: 09/07/2023] Open
Abstract
BACKGROUND Caveolins are the principal structural components of plasma membrane caveolae. Dominant pathogenic mutations in the muscle-specific caveolin-3 (Cav3) gene isoform, such as the limb girdle muscular dystrophy type 1C (LGMD-1C) P104L mutation, result in dramatic loss of the Cav3 protein and pathophysiological muscle weakness/wasting. We hypothesize that such muscle degeneration may be linked to disturbances in signalling events that impact protein turnover. Herein, we report studies assessing the effects of Cav3 deficiency on mammalian or mechanistic target of rapamycin complex 1 (mTORC1) signalling in skeletal muscle cells. METHODS L6 myoblasts were stably transfected with Cav3P104L or expression of native Cav3 was abolished by CRISPR/Cas9 genome editing (Cav3 knockout [Cav3KO]) prior to performing subcellular fractionation and immunoblotting, analysis of real-time mitochondrial respiration or fixed cell immunocytochemistry. Skeletal muscle from wild-type and Cav3-/- mice was processed for immunoblot analysis of downstream mTORC1 substrate phosphorylation. RESULTS Cav3 was detected in lysosomal-enriched membranes isolated from L6 myoblasts and observed by confocal microscopy to co-localize with lysosomal-specific markers. Cav3P104L expression, which results in significant (~95%) loss of native Cav3, or CRISPR/Cas9-mediated Cav3KO, reduced amino acid-dependent mTORC1 activation. The decline in mTORC1-directed signalling was detected by immunoblot analysis of L6 muscle cells and gastrocnemius Cav3-/- mouse muscle as judged by reduced phosphorylation of mTORC1 substrates that play key roles in the initiation of protein synthesis (4EBP1S65 and S6K1T389 ). S6K1T389 and 4EBP1S65 phosphorylation reduced by over 75% and 80% in Cav3KO muscle cells and by over 90% and 30% in Cav3-/- mouse skeletal muscle, respectively. The reduction in protein synthetic capacity in L6 muscle cells was confirmed by analysis of puromycylated peptides using the SUnSET assay. Cav3 loss was also associated with a 26% increase in lysosomal cholesterol, and pharmacological manipulation of lysosomal cholesterol was effective in replicating the reduction in mTORC1 activity observed in Cav3KO cells. Notably, re-expression of Cav3 in Cav3KO myoblasts normalized lysosomal cholesterol content, which coincided with a recovery in protein translation and an associated increase in mTORC1-directed phosphorylation of downstream targets. CONCLUSIONS Our findings indicate that Cav3 can localize on lysosomal membranes and is a novel regulator of mTORC1 signalling in muscle. Cav3 deficiency associated with the Cav3P104L mutation impairs mTORC1 activation and protein synthetic capacity in skeletal muscle cells, which may be linked to disturbances in lysosomal cholesterol trafficking and contribute to the pathology of LGMD-1C.
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Affiliation(s)
- Dinesh S. Shah
- Division of Cell Signalling and Immunology, Sir James Black Centre, School of Life SciencesUniversity of DundeeDundeeDD1 5EHUK
| | - Raid B. Nisr
- Division of Cell Signalling and Immunology, Sir James Black Centre, School of Life SciencesUniversity of DundeeDundeeDD1 5EHUK
| | | | - Harinder S. Hundal
- Division of Cell Signalling and Immunology, Sir James Black Centre, School of Life SciencesUniversity of DundeeDundeeDD1 5EHUK
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Ilha M, Meira Martins LA, da Silveira Moraes K, Dias CK, Thomé MP, Petry F, Rohden F, Borojevic R, Trindade VMT, Klamt F, Barbé‐Tuana F, Lenz G, Guma FCR. Caveolin-1 influences mitochondrial plasticity and function in hepatic stellate cell activation. Cell Biol Int 2022; 46:1787-1800. [PMID: 35971753 PMCID: PMC9804617 DOI: 10.1002/cbin.11876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 03/21/2022] [Accepted: 05/26/2022] [Indexed: 01/05/2023]
Abstract
Caveolin-1 (Cav-1) is an integral membrane protein present in all organelles, responsible for regulating and integrating multiple signals as a platform. Mitochondria are extremely adaptable to external cues in chronic liver diseases, and expression of Cav-1 may affect mitochondrial flexibility in hepatic stellate cells (HSCs) activation. We previously demonstrated that exogenous expression of Cav-1 was sufficient to increase some classical markers of activation in HSCs. Here, we aimed to evaluate the influence of exogenous expression and knockdown of Cav-1 on regulating the mitochondrial plasticity, metabolism, endoplasmic reticulum (ER)-mitochondria distance, and lysosomal activity in HSCs. To characterize the mitochondrial, lysosomal morphology, and ER-mitochondria distance, we perform transmission electron microscope analysis. We accessed mitochondria and lysosomal networks and functions through a confocal microscope and flow cytometry. The expression of mitochondrial machinery fusion/fission genes was examined by real-time polymerase chain reaction. Total and mitochondrial cholesterol content was measured using Amplex Red. To define energy metabolism, we used the Oroboros system in the cells. We report that GRX cells with exogenous expression or knockdown of Cav-1 changed mitochondrial morphometric parameters, OXPHOS metabolism, ER-mitochondria distance, lysosomal activity, and may change the activation state of HSC. This study highlights that Cav-1 may modulate mitochondrial function and structural reorganization in HSC activation, being a potential candidate marker for chronic liver diseases and a molecular target for therapeutic intervention.
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Affiliation(s)
- Mariana Ilha
- Programa de Pós‐Graduação em Ciências Biológicas‐Bioquímica, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul – UFRGSPorto AlegreRio Grande do SulBrasil,Department of Clinical Nutrition, Institute of Public Health and Clinical NutritionUniversity of Eastern FinlandKuopioFinland
| | - Leo A. Meira Martins
- Programa de Pós‐Graduação em Ciências Biológicas‐Bioquímica, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul – UFRGSPorto AlegreRio Grande do SulBrasil,Departamento de Fisiologia, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul ‐ UFRGSPorto AlegreRio Grande do SulBrasil
| | - Ketlen da Silveira Moraes
- Departamento de Bioquímica, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul ‐ UFRGSPorto AlegreRio Grande do SulBrasil
| | - Camila K. Dias
- Programa de Pós‐Graduação em Ciências Biológicas‐Bioquímica, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul – UFRGSPorto AlegreRio Grande do SulBrasil
| | - Marcos P. Thomé
- Departamento de Biofísica e Centro de BiotecnologiaUniversidade Federal do Rio Grande do Sul ‐ UFRGSPorto AlegreRio Grande do SulBrasil
| | - Fernanda Petry
- Programa de Pós‐Graduação em Ciências Biológicas‐Bioquímica, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul – UFRGSPorto AlegreRio Grande do SulBrasil
| | - Francieli Rohden
- Programa de Pós‐Graduação em Ciências Biológicas‐Bioquímica, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul – UFRGSPorto AlegreRio Grande do SulBrasil
| | - Radovan Borojevic
- Centro de Medicina RegenerativaFaculdade Arthur Sa Earp Neto ‐ Faculdade de Medicina de PetrópolisRio de JaneiroBrasil
| | - Vera M. T. Trindade
- Departamento de Bioquímica, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul ‐ UFRGSPorto AlegreRio Grande do SulBrasil
| | - Fábio Klamt
- Departamento de Bioquímica, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul ‐ UFRGSPorto AlegreRio Grande do SulBrasil
| | - Florência Barbé‐Tuana
- Programa de Pós‐Graduação em Biologia Celular e MolecularEscola de Ciências da Pontifícia Universidade Católica do Rio Grande do Sul‐ PUCRSPorto AlegreRio Grande do SulBrasil
| | - Guido Lenz
- Departamento de Biofísica e Centro de BiotecnologiaUniversidade Federal do Rio Grande do Sul ‐ UFRGSPorto AlegreRio Grande do SulBrasil
| | - Fátima C. R. Guma
- Departamento de Bioquímica, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul ‐ UFRGSPorto AlegreRio Grande do SulBrasil,Centro de Microscopia e MicroanáliseUniversidade Federal do Rio Grande do Sul ‐ UFRGSPorto AlegreRio Grande do SulBrasil
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Annexins and Membrane Repair Dysfunctions in Muscular Dystrophies. Int J Mol Sci 2021; 22:ijms22105276. [PMID: 34067866 PMCID: PMC8155887 DOI: 10.3390/ijms22105276] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 11/16/2022] Open
Abstract
Muscular dystrophies constitute a group of genetic disorders that cause weakness and progressive loss of skeletal muscle mass. Among them, Miyoshi muscular dystrophy 1 (MMD1), limb girdle muscular dystrophy type R2 (LGMDR2/2B), and LGMDR12 (2L) are characterized by mutation in gene encoding key membrane-repair protein, which leads to severe dysfunctions in sarcolemma repair. Cell membrane disruption is a physiological event induced by mechanical stress, such as muscle contraction and stretching. Like many eukaryotic cells, muscle fibers possess a protein machinery ensuring fast resealing of damaged plasma membrane. Members of the annexins A (ANXA) family belong to this protein machinery. ANXA are small soluble proteins, twelve in number in humans, which share the property of binding to membranes exposing negatively-charged phospholipids in the presence of calcium (Ca2+). Many ANXA have been reported to participate in membrane repair of varied cell types and species, including human skeletal muscle cells in which they may play a collective role in protection and repair of the sarcolemma. Here, we discuss the participation of ANXA in membrane repair of healthy skeletal muscle cells and how dysregulation of ANXA expression may impact the clinical severity of muscular dystrophies.
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Russell J, Du Toit EF, Peart JN, Patel HH, Headrick JP. Myocyte membrane and microdomain modifications in diabetes: determinants of ischemic tolerance and cardioprotection. Cardiovasc Diabetol 2017; 16:155. [PMID: 29202762 PMCID: PMC5716308 DOI: 10.1186/s12933-017-0638-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 11/22/2017] [Indexed: 02/06/2023] Open
Abstract
Cardiovascular disease, predominantly ischemic heart disease (IHD), is the leading cause of death in diabetes mellitus (DM). In addition to eliciting cardiomyopathy, DM induces a ‘wicked triumvirate’: (i) increasing the risk and incidence of IHD and myocardial ischemia; (ii) decreasing myocardial tolerance to ischemia–reperfusion (I–R) injury; and (iii) inhibiting or eliminating responses to cardioprotective stimuli. Changes in ischemic tolerance and cardioprotective signaling may contribute to substantially higher mortality and morbidity following ischemic insult in DM patients. Among the diverse mechanisms implicated in diabetic impairment of ischemic tolerance and cardioprotection, changes in sarcolemmal makeup may play an overarching role and are considered in detail in the current review. Observations predominantly in animal models reveal DM-dependent changes in membrane lipid composition (cholesterol and triglyceride accumulation, fatty acid saturation vs. reduced desaturation, phospholipid remodeling) that contribute to modulation of caveolar domains, gap junctions and T-tubules. These modifications influence sarcolemmal biophysical properties, receptor and phospholipid signaling, ion channel and transporter functions, contributing to contractile and electrophysiological dysfunction, cardiomyopathy, ischemic intolerance and suppression of protective signaling. A better understanding of these sarcolemmal abnormalities in types I and II DM (T1DM, T2DM) can inform approaches to limiting cardiomyopathy, associated IHD and their consequences. Key knowledge gaps include details of sarcolemmal changes in models of T2DM, temporal patterns of lipid, microdomain and T-tubule changes during disease development, and the precise impacts of these diverse sarcolemmal modifications. Importantly, exercise, dietary, pharmacological and gene approaches have potential for improving sarcolemmal makeup, and thus myocyte function and stress-resistance in this ubiquitous metabolic disorder.
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Affiliation(s)
- Jake Russell
- Menzies Health Institute Queensland, Griffith University, Southport, QLD, Australia
| | - Eugene F Du Toit
- Menzies Health Institute Queensland, Griffith University, Southport, QLD, Australia
| | - Jason N Peart
- Menzies Health Institute Queensland, Griffith University, Southport, QLD, Australia
| | - Hemal H Patel
- VA San Diego Healthcare System and Department of Anesthesiology, University of California San Diego, San Diego, USA
| | - John P Headrick
- Menzies Health Institute Queensland, Griffith University, Southport, QLD, Australia. .,School of Medical Science, Griffith University, Southport, QLD, 4217, Australia.
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Malinska A, Podemska Z, Sujka-Kordowska P, Witkiewicz W, Nowicki M, Perek B, Witt M. Caveolin 2: a facultative marker of unfavourable prognosis in long-term patency rate of internal thoracic artery grafts used in coronary artery bypass grafting. Preliminary report. Interact Cardiovasc Thorac Surg 2017; 24:714-720. [PMID: 28453798 DOI: 10.1093/icvts/ivw411] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Accepted: 11/21/2016] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES Intimal hyperplasia leading to graft failure in patients undergoing coronary artery bypass grafting (CABG) is related to vascular smooth muscle cells (SMCs) proliferation. SMCs respond to a variety of mediators, the most important of which is platelet-derived growth factor (PDGF). The platelet-derived growth factor-induced cellular response has been shown to be mediated by caveolins. The aim of this study was to analyze CAV1-3 expression in internal thoracic artery (ITA) grafts used in CABG and correlate their expression with graft occlusion. METHODS Six hundred patients undergoing CABG with the use of ITA grafts between 2008 and 2014 were enrolled into this prospective study. CAV1-3 expression in the ITA grafts was analyzed prior to graft transplantation into the coronary circulation via immunohistochemistry. Estimated caveolins expression pattern was then correlated with the occurrence of ITA graft failure observed within 24-months of surgery. RESULTS Thirty-four patients developed ITA graft failure (subgroup A) and 566 study participants presented no adverse events (subgroup B). CAV1 and CAV3 expression levels in SMCs of the tunica media of the ITA grafts did not differ between the study subgroups and were not associated with the risk of graft failure. CAV2 was expressed within SMCs of the ITA grafts in 94.1% of the patients from subgroup A and 2.5% from subgroup B, and its expression was associated with ITA graft occlusion observed within 24-months after CABG. CONCLUSIONS CAV2 expression in SMCs of the tunica media in autologous ITA transplants might indicate the risk of graft failure.
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Affiliation(s)
- Agnieszka Malinska
- Department of Histology and Embryology, Poznan University of Medical Sciences, Poznan, Poland
| | - Zuzanna Podemska
- Department of Histology and Embryology, Poznan University of Medical Sciences, Poznan, Poland
| | | | | | - Michal Nowicki
- Department of Histology and Embryology, Poznan University of Medical Sciences, Poznan, Poland
| | - Bartlomiej Perek
- Department of Cardiac Surgery, Poznan University of Medical Sciences, Poznan, Poland
| | - Martin Witt
- Department of Anatomy, University of Rostock, Rostock, Germany
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6
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Transactivation of the epidermal growth factor receptor in responses to myocardial stress and cardioprotection. Int J Biochem Cell Biol 2017; 83:97-110. [DOI: 10.1016/j.biocel.2016.12.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 12/25/2016] [Accepted: 12/26/2016] [Indexed: 12/20/2022]
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See Hoe LE, May LT, Headrick JP, Peart JN. Sarcolemmal dependence of cardiac protection and stress-resistance: roles in aged or diseased hearts. Br J Pharmacol 2016; 173:2966-91. [PMID: 27439627 DOI: 10.1111/bph.13552] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 06/27/2016] [Accepted: 06/28/2016] [Indexed: 12/25/2022] Open
Abstract
Disruption of the sarcolemmal membrane is a defining feature of oncotic death in cardiac ischaemia-reperfusion (I-R), and its molecular makeup not only fundamentally governs this process but also affects multiple determinants of both myocardial I-R injury and responsiveness to cardioprotective stimuli. Beyond the influences of membrane lipids on the cytoprotective (and death) receptors intimately embedded within this bilayer, myocardial ionic homeostasis, substrate metabolism, intercellular communication and electrical conduction are all sensitive to sarcolemmal makeup, and critical to outcomes from I-R. As will be outlined in this review, these crucial sarcolemmal dependencies may underlie not only the negative effects of age and common co-morbidities on myocardial ischaemic tolerance but also the on-going challenge of implementing efficacious cardioprotection in patients suffering accidental or surgically induced I-R. We review evidence for the involvement of sarcolemmal makeup changes in the impairment of stress-resistance and cardioprotection observed with ageing and highly prevalent co-morbid conditions including diabetes and hypercholesterolaemia. A greater understanding of membrane changes with age/disease, and the inter-dependences of ischaemic tolerance and cardioprotection on sarcolemmal makeup, can facilitate the development of strategies to preserve membrane integrity and cell viability, and advance the challenging goal of implementing efficacious 'cardioprotection' in clinically relevant patient cohorts. Linked Articles This article is part of a themed section on Molecular Pharmacology of G Protein-Coupled Receptors. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v173.20/issuetoc.
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Affiliation(s)
- Louise E See Hoe
- Menzies Health Institute Queensland, Griffith University, Gold Coast, Australia.,Critical Care Research Group, The Prince Charles Hospital and The University of Queensland, Chermside, Queensland, Australia
| | - Lauren T May
- Monash Institute of Pharmaceutical Sciences, Monash University, Clayton, VIC, Australia
| | - John P Headrick
- Menzies Health Institute Queensland, Griffith University, Gold Coast, Australia
| | - Jason N Peart
- Menzies Health Institute Queensland, Griffith University, Gold Coast, Australia.
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Forsythe ID. Editorial. J Physiol 2016; 594:4469-70. [DOI: 10.1113/jp272724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Ian D. Forsythe
- Department of Neuroscience, Psychology & Behaviour; University of Leicester; UK
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