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Lu Q, Pan B, Bai H, Zhao W, Liu L, Li G, Liu R, Lv T, Huang X, Li X, Tian J. Intranuclear cardiac troponin I plays a functional role in regulating Atp2a2 expression in cardiomyocytes. Genes Dis 2022; 9:1689-1700. [PMID: 36157491 PMCID: PMC9485201 DOI: 10.1016/j.gendis.2021.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 03/11/2021] [Accepted: 04/15/2021] [Indexed: 11/21/2022] Open
Abstract
In the past studies, it is shown that cardiac troponin I (cTnI, encoded by TNNI3), as a cytoplasmic protein, is an inhibitory subunit in troponin complex, and involves in cardiomyocyte diastolic regulation. Here, we assessed a novel role of cTnI as a nucleoprotein. Firstly, the nuclear translocation of cTnI was found in mouse, human fetuses and rat heart tissues. In addition, there were differences in percentage of intranuclear cTnI in different conditions. Based on weighted gene co-expression network analyses (WGCNA) and verification in cell experiments, a strong expression correlation was found between TNNI3 and Atp2a2, which encodes sarco-endoplasmic reticulum Ca2+ ATPase isoform 2a (SERCA2a), and involves in ATP hydrolysis and Ca2+ transient. TNNI3 gain and loss caused Atpa2a2 increase/decrease in a dose-dependent manner both in mRNA and protein levels, in vivo and in vitro. By using ChIP-sequence we demonstrated specific binding DNA sequences of cTnI were enriched in ATP2a2 promoter −239∼–889 region and the specific binding sequence motif of cTnI was analyzed by software as "CCAT", which has been reported to be required for YY1 binding to the promoter region of YY1-related genes. Moreover, it was further verified that pcDNA3.1 (−)-TNNI3 could express cTnI proteins and increase the promoter activity of Atp2a2 through luciferase report assay. In the end, we evaluated beat frequencies, total ATP contents, Ca2+ transients in TNNI3-siRNA myocardial cells. These findings indicated, for the first time, cTnI may regulate Atp2a2 in cardiomyocytes as a co-regulatory factor and participate in the regulation of intracellular Ca ions.
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Affiliation(s)
- Qian Lu
- Department of Pediatric Cardiology, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing 400014, PR China.,Department of Biomedical Science, Charlie E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, USA
| | - Bo Pan
- Department of Pediatric Cardiology, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing 400014, PR China
| | - Haobo Bai
- Department of Orthopedic, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, PR China
| | - Weian Zhao
- Department of Pediatric Cardiology, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing 400014, PR China
| | - Lingjuan Liu
- Department of Pediatric Cardiology, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing 400014, PR China
| | - Gu Li
- Department of Pediatric Cardiology, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing 400014, PR China
| | - Ruimin Liu
- Department of Pediatric Cardiology, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing 400014, PR China
| | - Tiewei Lv
- Department of Pediatric Cardiology, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing 400014, PR China
| | - Xupei Huang
- Department of Biomedical Science, Charlie E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, USA
| | - Xi Li
- Biology Science Institutes of Chongqing Medical University, Chongqing 400016, PR China
| | - Jie Tian
- Department of Pediatric Cardiology, Ministry of Education Key Laboratory of Child Development and Disorders, National Clinical Research Center for Child Health and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing 400014, PR China.,Chongqing Key Laboratory of Pediatrics, Chongqing 400014, PR China
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2
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Cardiac troponin T and autoimmunity in skeletal muscle aging. GeroScience 2022; 44:2025-2045. [PMID: 35034279 PMCID: PMC9616986 DOI: 10.1007/s11357-022-00513-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 01/05/2022] [Indexed: 01/03/2023] Open
Abstract
Age-related muscle mass and strength decline (sarcopenia) impairs the performance of daily living activities and can lead to mobility disability/limitation in older adults. Biological pathways in muscle that lead to mobility problems have not been fully elucidated. Immunoglobulin G (IgG) infiltration in muscle is a known marker of increased fiber membrane permeability and damage vulnerability, but whether this translates to impaired function is unknown. Here, we report that IgG1 and IgG4 are abundantly present in the skeletal muscle (vastus lateralis) of ~ 50% (11 out of 23) of older adults (> 65 years) examined. Skeletal muscle IgG1 was inversely correlated with physical performance (400 m walk time: r = 0.74, p = 0.005; SPPB score: r = - 0.73, p = 0.006) and muscle strength (r = - 0.6, p = 0.05). In a murine model, IgG was found to be higher in both muscle and blood of older, versus younger, C57BL/6 mice. Older mice with a higher level of muscle IgG had lower motor activity. IgG in mouse muscle co-localized with cardiac troponin T (cTnT) and markers of complement activation and apoptosis/necroptosis. Skeletal muscle-inducible cTnT knockin mice also showed elevated IgG in muscle and an accelerated muscle degeneration and motor activity decline with age. Most importantly, anti-cTnT autoantibodies were detected in the blood of cTnT knockin mice, old mice, and older humans. Our findings suggest a novel cTnT-mediated autoimmune response may be an indicator of sarcopenia.
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Lu J, Li H, Zhang H, Lin Z, Xu C, Xu X, Hu L, Luan Z, Lou Y, Tang S. The distal arthrogryposis-linked p.R63C variant promotes the stability and nuclear accumulation of TNNT3. J Clin Lab Anal 2021; 35:e24089. [PMID: 34766372 PMCID: PMC8649346 DOI: 10.1002/jcla.24089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 09/13/2021] [Accepted: 10/09/2021] [Indexed: 11/11/2022] Open
Abstract
Background Distal arthrogryposis (DA) is comprised of a group of rare developmental disorders in muscle, characterized by multiple congenital contractures of the distal limbs. Fast skeletal muscle troponin‐T (TNNT3) protein is abundantly expressed in skeletal muscle and plays an important role in DA. Missense variants in TNNT3 are associated with DA, but few studies have fully clarified its pathogenic role. Methods Sanger sequencing was performed in three generation of a Chinese family with DA. To determine how the p.R63C variant contributed to DA, we identified a variant in TNNT3 (NM_006757.4): c.187C>T (p.R63C). And then we investigated the effects of the arginine to cysteine substitution on the distribution pattern and the half‐life of TNNT3 protein. Results The protein levels of TNNT3 in affected family members were 0.8‐fold higher than that without the disorder. TNNT3 protein could be degraded by the ubiquitin‐proteasome complex, and the p.R63C variant did not change TNNT3 nuclear localization, but significantly prolonged its half‐life from 2.5 to 7 h, to promote its accumulation in the nucleus. Conclusion The p.R63C variant increased the stability of TNNT3 and promoted nuclear accumulation, which suggested its role in DA.
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Affiliation(s)
- Jinfang Lu
- Wenzhou Key Laboratory of Sanitary Microbiology, Key Laboratory of Laboratory Medicine, Ministry of Education, China, School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, China
| | - Huanzheng Li
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China
| | - He Zhang
- Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, College of Life and Environmental Sciences, Wenzhou University, Wenzhou, China
| | - Zhengxiu Lin
- The Second Affiliated Hospital and Yuying Children's Hospital of WMU, School of the Second Clinical Medical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Chenyang Xu
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China
| | - Xueqin Xu
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China
| | - Lin Hu
- Key Laboratory of Medical Genetic, School of Laboratory Medicine and Life Science, Wenzhou Medical University, Wenzhou, China
| | - Zhaotang Luan
- Key Laboratory of Medical Genetic, School of Laboratory Medicine and Life Science, Wenzhou Medical University, Wenzhou, China
| | - Yongliang Lou
- Wenzhou Key Laboratory of Sanitary Microbiology, Key Laboratory of Laboratory Medicine, Ministry of Education, China, School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, China
| | - Shaohua Tang
- Key Laboratory of Birth Defects, Department of Genetics, Wenzhou Central Hospital, Wenzhou, China.,Key Laboratory of Medical Genetic, School of Laboratory Medicine and Life Science, Wenzhou Medical University, Wenzhou, China
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Kharitonov AV, Shubina MY, Nosov GA, Mamontova AV, Arifulin EA, Lisitsyna OM, Nalobin DS, Musinova YR, Sheval EV. Switching of cardiac troponin I between nuclear and cytoplasmic localization during muscle differentiation. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2019; 1867:118601. [PMID: 31733262 DOI: 10.1016/j.bbamcr.2019.118601] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 11/02/2019] [Accepted: 11/11/2019] [Indexed: 11/18/2022]
Abstract
The nuclear accumulation of proteins may depend on the presence of short targeting sequences, which are known as nuclear localization signals (NLSs). Here, we found that NLSs are predicted in some cytosolic proteins and examined the hypothesis that these NLSs may be functional under certain conditions. As a model, human cardiac troponin I (hcTnI) was used. After expression in cultured non-muscle or undifferentiated muscle cells, hcTnI accumulated inside nuclei. Several NLSs were predicted and confirmed by site-directed mutagenesis in hcTnI. Nuclear import occurred via the classical karyopherin-α/β nuclear import pathway. However, hcTnI expressed in cultured myoblasts redistributed from the nucleus to the cytoplasm, where it was integrated into forming myofibrils after the induction of muscle differentiation. It appears that the dynamic retention of proteins inside cytoplasmic structures can lead to switching between nuclear and cytoplasmic localization.
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Affiliation(s)
- Alexey V Kharitonov
- Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Maria Y Shubina
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, 119991 Moscow, Russia; Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Georgii A Nosov
- Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; Institute of Medical Physics and Biophysics, 48149 Muenster, Germany
| | - Anastasia V Mamontova
- Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, 117997 Moscow, Russia
| | - Eugene A Arifulin
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Olga M Lisitsyna
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Denis S Nalobin
- Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Yana R Musinova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; Koltzov Institute of Developmental Biology, Russian Academy of Sciences, 119334 Moscow, Russia; Skobelkin State Scientific Center of Laser Medicine FMBA, 121165 Moscow, Russia
| | - Eugene V Sheval
- Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; LIA 1066 LFR2O French-Russian Joint Cancer Research Laboratory, 94805 Villejuif, France.
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5
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Nunez Lopez YO, Messi ML, Pratley RE, Zhang T, Delbono O. Troponin T3 associates with DNA consensus sequence that overlaps with p53 binding motifs. Exp Gerontol 2018; 108:35-40. [PMID: 29596868 DOI: 10.1016/j.exger.2018.03.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 02/25/2018] [Accepted: 03/09/2018] [Indexed: 12/25/2022]
Abstract
We recently reported that in addition to its classical cytoplasmic location, the fast skeletal muscle Troponin T3 (TnT3) shuttles to the nucleus, where it appears to perform nonclassical transcription regulatory functions. Importantly, changes in the composition of the nucleus-localized pool of TnT3 and its fragments contribute to age-dependent muscle damage and wasting. Here, using ChIP-Seq, we demonstrate that TnT3 associates with DNA consensus sequences including the TGCCT motif, which is required for p53 binding to the promoter area of p53-related genes. Gene set enrichment analysis further demonstrated that the p53 pathway was the most significantly enriched pathway among genes annotated to the TnT3 ChIP-Seq peaks. We further demonstrated a strong correlation (r = 0.78, P = 1 × 10-4) between the expression levels of TNNT3 and TP53-inducible ribonucleotide reductase regulatory subunit M2B (RRM2B) in skeletal muscle tissue of 21 lean non-diabetic human subjects and a significant (P < 0.05) reduction in the levels of both gene transcripts in the third age-tertile group [42.3-70 years of age (yoa)] as compared to the second age-tertile (31.3-42.3 yoa). Of note, both TNNT3 and RRM2B expression levels negatively associated with total body fat mass (each with r = 0.49, P < 0.05), whereas RRM2B positively correlated with pancreatic β cell function (rRRM2B~HOMA-B = 0.47, P = 0.047). This work suggests that reduced TNNT3 gene expression is another mechanism leading to reduced TnT3 and excitation-contraction coupling with aging. Consequently, TnT3 appears to contribute to age-related sarcopenia and possibly other age-related deficiencies such as muscle insulin resistance and β cell dysfunction by interacting with TnT3-binding sequences in the promoter area of p53-related genes, among others, and consequently modulating the transcriptional regulation of these target genes.
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Affiliation(s)
- Yury O Nunez Lopez
- Translational Research Institute for Metabolism and Diabetes, Florida Hospital, Orlando, FL 32804, United States.
| | - Maria Laura Messi
- Departments of Internal Medicine, Section of Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157, United States
| | - Richard E Pratley
- Translational Research Institute for Metabolism and Diabetes, Florida Hospital, Orlando, FL 32804, United States
| | - Tan Zhang
- Departments of Internal Medicine, Section of Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157, United States
| | - Osvaldo Delbono
- Departments of Internal Medicine, Section of Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157, United States.
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6
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Tieland M, Trouwborst I, Clark BC. Skeletal muscle performance and ageing. J Cachexia Sarcopenia Muscle 2018; 9:3-19. [PMID: 29151281 PMCID: PMC5803609 DOI: 10.1002/jcsm.12238] [Citation(s) in RCA: 422] [Impact Index Per Article: 70.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 07/20/2017] [Accepted: 08/05/2017] [Indexed: 02/06/2023] Open
Abstract
The world population is ageing rapidly. As society ages, the incidence of physical limitations is dramatically increasing, which reduces the quality of life and increases healthcare expenditures. In western society, ~30% of the population over 55 years is confronted with moderate or severe physical limitations. These physical limitations increase the risk of falls, institutionalization, co-morbidity, and premature death. An important cause of physical limitations is the age-related loss of skeletal muscle mass, also referred to as sarcopenia. Emerging evidence, however, clearly shows that the decline in skeletal muscle mass is not the sole contributor to the decline in physical performance. For instance, the loss of muscle strength is also a strong contributor to reduced physical performance in the elderly. In addition, there is ample data to suggest that motor coordination, excitation-contraction coupling, skeletal integrity, and other factors related to the nervous, muscular, and skeletal systems are critically important for physical performance in the elderly. To better understand the loss of skeletal muscle performance with ageing, we aim to provide a broad overview on the underlying mechanisms associated with elderly skeletal muscle performance. We start with a system level discussion and continue with a discussion on the influence of lifestyle, biological, and psychosocial factors on elderly skeletal muscle performance. Developing a broad understanding of the many factors affecting elderly skeletal muscle performance has major implications for scientists, clinicians, and health professionals who are developing therapeutic interventions aiming to enhance muscle function and/or prevent mobility and physical limitations and, as such, support healthy ageing.
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Affiliation(s)
- Michael Tieland
- Faculty of Sports and NutritionAmsterdam University of Applied SciencesDr. Meurerlaan 81067 SMAmsterdamthe Netherlands
| | - Inez Trouwborst
- Faculty of Sports and NutritionAmsterdam University of Applied SciencesDr. Meurerlaan 81067 SMAmsterdamthe Netherlands
| | - Brian C. Clark
- Ohio Musculoskeletal and Neurological Institute (OMNI)Ohio University250 Irvine HallAthensOH 45701USA
- Department of Biomedical SciencesOhio UniversityAthensOH 45701USA
- Department of Geriatric MedicineOhio UniversityAthensOH 45701USA
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7
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Johnston JR, Chase PB, Pinto JR. Troponin through the looking-glass: emerging roles beyond regulation of striated muscle contraction. Oncotarget 2017; 9:1461-1482. [PMID: 29416706 PMCID: PMC5787451 DOI: 10.18632/oncotarget.22879] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 11/20/2017] [Indexed: 01/03/2023] Open
Abstract
Troponin is a heterotrimeric Ca2+-binding protein that has a well-established role in regulating striated muscle contraction. However, mounting evidence points to novel cellular functions of troponin, with profound implications in cancer, cardiomyopathy pathogenesis and skeletal muscle aging. Here, we highlight the non-canonical roles and aberrant expression patterns of troponin beyond the sarcomeric milieu. Utilizing bioinformatics tools and online databases, we also provide pathway, subcellular localization, and protein-protein/DNA interaction analyses that support a role for troponin in multiple subcellular compartments. This emerging knowledge challenges the conventional view of troponin as a sarcomere-specific protein exclusively involved in muscle contraction and may transform the way we think about sarcomeric proteins, particularly in the context of human disease and aging.
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Affiliation(s)
- Jamie R Johnston
- Department of Biomedical Sciences, The Florida State University College of Medicine, Tallahassee, FL, 32306-4300, USA
| | - P Bryant Chase
- Department of Biological Science, The Florida State University, Tallahassee, FL, 32306-4370, USA
| | - Jose Renato Pinto
- Department of Biomedical Sciences, The Florida State University College of Medicine, Tallahassee, FL, 32306-4300, USA
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8
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Pinto JR, Muller-Delp J, Chase PB. Will you still need me (Ca 2+ , TnT, and DHPR), will you still cleave me (calpain), when I'm 64? Aging Cell 2017; 16:202-204. [PMID: 28008709 PMCID: PMC5334566 DOI: 10.1111/acel.12560] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2016] [Indexed: 10/25/2022] Open
Affiliation(s)
- José Renato Pinto
- Department of Biomedical Sciences; The Florida State University College of Medicine; 1115 West Call Street Tallahassee FL 32306-4300 USA
| | - Judy Muller-Delp
- Department of Biomedical Sciences; The Florida State University College of Medicine; 1115 West Call Street Tallahassee FL 32306-4300 USA
| | - P. Bryant Chase
- Department of Biological Science; The Florida State University; 81 Chieftain Way Tallahassee FL 32306-4370 USA
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9
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Zhang T, Pereyra AS, Wang Z, Birbrair A, Reisz JA, Files DC, Purcell L, Feng X, Messi ML, Feng H, Chalovich J, Jin J, Furdui C, Delbono O. Calpain inhibition rescues troponin T3 fragmentation, increases Cav1.1, and enhances skeletal muscle force in aging sedentary mice. Aging Cell 2016; 15:488-98. [PMID: 26892246 PMCID: PMC4854922 DOI: 10.1111/acel.12453] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/2016] [Indexed: 01/19/2023] Open
Abstract
Loss of strength in human and animal models of aging can be partially attributed to a well-recognized decrease in muscle mass; however, starting at middle-age, the normalized force (force/muscle cross-sectional area) in the knee extensors and single muscle fibers declines in a curvilinear manner. Strength is lost faster than muscle mass and is a more consistent risk factor for disability and death. Reduced expression of the voltage sensor Ca(2+) channel α1 subunit (Cav1.1) with aging leads to excitation-contraction uncoupling, which accounts for a significant fraction of the decrease in skeletal muscle function. We recently reported that in addition to its classical cytoplasmic location, fast skeletal muscle troponin T3 (TnT3) is fragmented in aging mice, and both full-length TnT3 (FL-TnT3) and its carboxyl-terminal (CT-TnT3) fragment shuttle to the nucleus. Here, we demonstrate that it regulates transcription of Cacna1s, the gene encoding Cav1.1. Knocking down TnT3 in vivo downregulated Cav1.1. TnT3 downregulation or overexpression decreased or increased, respectively, Cacna1s promoter activity, and the effect was ablated by truncating the TnT3 nuclear localization sequence. Further, we mapped the Cacna1s promoter region and established the consensus sequence for TnT3 binding to Cacna1s promoter. Systemic administration of BDA-410, a specific calpain inhibitor, prevented TnT3 fragmentation, and Cacna1s and Cav1.1 downregulation and improved muscle force generation in sedentary old mice.
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MESH Headings
- Aging/physiology
- Animals
- Biomechanical Phenomena/drug effects
- Calcium Channels, L-Type/genetics
- Calcium Channels, L-Type/metabolism
- Calpain/antagonists & inhibitors
- Calpain/metabolism
- Cell Line
- Cell Nucleus/drug effects
- Cell Nucleus/metabolism
- Electrophoretic Mobility Shift Assay
- Female
- Gene Knockdown Techniques
- Isometric Contraction/drug effects
- Mice, Inbred C57BL
- Muscle Fatigue/drug effects
- Muscle Fibers, Fast-Twitch/drug effects
- Muscle Fibers, Fast-Twitch/physiology
- Muscle Fibers, Slow-Twitch/drug effects
- Muscle Fibers, Slow-Twitch/physiology
- Muscle, Skeletal/drug effects
- Muscle, Skeletal/enzymology
- Muscle, Skeletal/physiology
- Promoter Regions, Genetic/genetics
- Protein Binding/drug effects
- Protein Stability/drug effects
- Sulfonamides/pharmacology
- Transcription, Genetic/drug effects
- Troponin T/metabolism
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Affiliation(s)
- Tan Zhang
- Department of Internal MedicineSection on Gerontology and Geriatric MedicineWake Forest School of MedicineWinston‐SalemNCUSA
- Molecular Medicine and Translational ScienceWake Forest School of MedicineWinston‐SalemNCUSA
| | - Andrea S. Pereyra
- Department of Internal MedicineSection on Gerontology and Geriatric MedicineWake Forest School of MedicineWinston‐SalemNCUSA
- Present address: Biochemistry Research Institute of La Plata (INIBIOLP)/CONICETSchool of MedicineNational University of La Plata1900La PlataBAArgentina
| | - Zhong‐Min Wang
- Department of Internal MedicineSection on Gerontology and Geriatric MedicineWake Forest School of MedicineWinston‐SalemNCUSA
| | - Alexander Birbrair
- Department of Internal MedicineSection on Gerontology and Geriatric MedicineWake Forest School of MedicineWinston‐SalemNCUSA
- Present address: Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine, Albert Einstein College of MedicineNY10461USA
| | - Julie A. Reisz
- Molecular Medicine and Translational ScienceWake Forest School of MedicineWinston‐SalemNCUSA
- Present address: Department of Biochemistry and Molecular GeneticsUniversity of Colorado DenverAuroraCO80045New YorkUSA
| | - Daniel Clark Files
- Pulmonary, Critical Care, Allergy and Immunologic DiseasesWake Forest School of MedicineWinston‐SalemNCUSA
| | - Lina Purcell
- Pulmonary, Critical Care, Allergy and Immunologic DiseasesWake Forest School of MedicineWinston‐SalemNCUSA
| | - Xin Feng
- Department of OtolaryngologyWake Forest School of MedicineWinston‐SalemNCUSA
| | - Maria L. Messi
- Department of Internal MedicineSection on Gerontology and Geriatric MedicineWake Forest School of MedicineWinston‐SalemNCUSA
| | - Hanzhong Feng
- Wayne State University School of MedicineDetroitMIUSA
| | - Joseph Chalovich
- Department of Biochemistry and Molecular BiologyBrody School of MedicineEast Carolina UniversityGreenvilleNCUSA
| | - Jian‐Ping Jin
- Wayne State University School of MedicineDetroitMIUSA
| | - Cristina Furdui
- Molecular Medicine and Translational ScienceWake Forest School of MedicineWinston‐SalemNCUSA
| | - Osvaldo Delbono
- Department of Internal MedicineSection on Gerontology and Geriatric MedicineWake Forest School of MedicineWinston‐SalemNCUSA
- J Paul Sticht Center on AgingWake Forest School of MedicineWinston‐SalemNCUSA
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10
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Zhang T, Taylor J, Jiang Y, Pereyra AS, Messi ML, Wang ZM, Hereñú C, Delbono O. Troponin T3 regulates nuclear localization of the calcium channel Cavβ1a subunit in skeletal muscle. Exp Cell Res 2015; 336:276-86. [PMID: 25981458 DOI: 10.1016/j.yexcr.2015.05.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 05/06/2015] [Indexed: 11/24/2022]
Abstract
The voltage-gated calcium channel (Cav) β1a subunit (Cavβ1a) plays an important role in excitation-contraction coupling (ECC), a process in the myoplasm that leads to muscle-force generation. Recently, we discovered that the Cavβ1a subunit travels to the nucleus of skeletal muscle cells where it helps to regulate gene transcription. To determine how it travels to the nucleus, we performed a yeast two-hybrid screening of the mouse fast skeletal muscle cDNA library and identified an interaction with troponin T3 (TnT3), which we subsequently confirmed by co-immunoprecipitation and co-localization assays in mouse skeletal muscle in vivo and in cultured C2C12 muscle cells. Interacting domains were mapped to the leucine zipper domain in TnT3 COOH-terminus (160-244 aa) and Cavβ1a NH2-terminus (1-99 aa), respectively. The double fluorescence assay in C2C12 cells co-expressing TnT3/DsRed and Cavβ1a/YFP shows that TnT3 facilitates Cavβ1a nuclear recruitment, suggesting that the two proteins play a heretofore unknown role during early muscle differentiation in addition to their classical role in ECC regulation.
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Affiliation(s)
- Tan Zhang
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
| | - Jackson Taylor
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
| | - Yang Jiang
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
| | - Andrea S Pereyra
- Department of Histology, National University of La Plata, 1900 La Plata, Argentina
| | - Maria Laura Messi
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
| | - Zhong-Min Wang
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
| | - Claudia Hereñú
- Department of Histology, National University of La Plata, 1900 La Plata, Argentina
| | - Osvaldo Delbono
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA; Neuroscience Program, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA.
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11
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Birbrair A, Zhang T, Files DC, Mannava S, Smith T, Wang ZM, Messi ML, Mintz A, Delbono O. Type-1 pericytes accumulate after tissue injury and produce collagen in an organ-dependent manner. Stem Cell Res Ther 2014; 5:122. [PMID: 25376879 PMCID: PMC4445991 DOI: 10.1186/scrt512] [Citation(s) in RCA: 199] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 09/30/2014] [Indexed: 02/06/2023] Open
Abstract
Introduction Fibrosis, or scar formation, is a pathological condition characterized by excessive production and accumulation of collagen, loss of tissue architecture, and organ failure in response to uncontrolled wound healing. Several cellular populations have been implicated, including bone marrow-derived circulating fibrocytes, endothelial cells, resident fibroblasts, epithelial cells, and recently, perivascular cells called pericytes. We previously demonstrated pericyte functional heterogeneity in skeletal muscle. Whether pericyte subtypes are present in other tissues and whether a specific pericyte subset contributes to organ fibrosis are unknown. Methods Here, we report the presence of two pericyte subtypes, type-1 (Nestin-GFP-/NG2-DsRed+) and type-2 (Nestin-GFP+/NG2-DsRed+), surrounding blood vessels in lungs, kidneys, heart, spinal cord, and brain. Using Nestin-GFP/NG2-DsRed transgenic mice, we induced pulmonary, renal, cardiac, spinal cord, and cortical injuries to investigate the contributions of pericyte subtypes to fibrous tissue formation in vivo. Results A fraction of the lung’s collagen-producing cells corresponds to type-1 pericytes and kidney and heart pericytes do not produce collagen in pathological fibrosis. Note that type-1, but not type-2, pericytes increase and accumulate near the fibrotic tissue in all organs analyzed. Surprisingly, after CNS injury, type-1 pericytes differ from scar-forming PDGFRβ + cells. Conclusions Pericyte subpopulations respond differentially to tissue injury, and the production of collagen by type-1 pericytes is organ-dependent. Characterization of the mechanisms underlying scar formation generates cellular targets for future anti-fibrotic therapeutics. Electronic supplementary material The online version of this article (doi:10.1186/scrt512) contains supplementary material, which is available to authorized users.
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12
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Birbrair A, Zhang T, Wang ZM, Messi ML, Olson JD, Mintz A, Delbono O. Type-2 pericytes participate in normal and tumoral angiogenesis. Am J Physiol Cell Physiol 2014; 307:C25-38. [PMID: 24788248 DOI: 10.1152/ajpcell.00084.2014] [Citation(s) in RCA: 230] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Tissue growth and function depend on vascularization, and vascular insufficiency or excess exacerbates many human diseases. Identification of the biological processes involved in angiogenesis will dictate strategies to modulate reduced or excessive vessel formation. We examine the essential role of pericytes. Their heterogeneous morphology, distribution, origins, and physiology have been described. Using double-transgenic Nestin-GFP/NG2-DsRed mice, we identified two pericyte subsets. We found that Nestin-GFP(-)/NG2-DsRed(+) (type-1) and Nestin-GFP(+)/NG2-DsRed(+) (type-2) pericytes attach to the walls of small and large blood vessels in vivo; in vitro, type-2, but not type-1, pericytes spark endothelial cells to form new vessels. Matrigel assay showed that only type-2 pericytes participate in normal angiogenesis. Moreover, when cancer cells were transplanted into Nestin-GFP/NG2-DsRed mice, type-1 pericytes did not penetrate the tumor, while type-2 pericytes were recruited during its angiogenesis. As inhibition of angiogenesis is a promising strategy in cancer therapy, type-2 pericytes may provide a cellular target susceptible to signaling and pharmacological manipulation in treating malignancy. This work also reports the potential of type-2 pericytes to improve blood perfusion in ischemic hindlimbs, indicating their potential for treating ischemic illnesses.
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Affiliation(s)
- Alexander Birbrair
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina; Neuroscience Program, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Tan Zhang
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Zhong-Min Wang
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Maria Laura Messi
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - John D Olson
- Department of Radiology, Wake Forest School of Medicine, Winston-Salem, North Carolina; and
| | - Akiva Mintz
- Department of Radiology, Wake Forest School of Medicine, Winston-Salem, North Carolina; and Department of Neurosurgery, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Osvaldo Delbono
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina; Neuroscience Program, Wake Forest School of Medicine, Winston-Salem, North Carolina;
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Birbrair A, Zhang T, Wang ZM, Messi ML, Mintz A, Delbono O. Type-1 pericytes participate in fibrous tissue deposition in aged skeletal muscle. Am J Physiol Cell Physiol 2013; 305:C1098-113. [PMID: 24067916 DOI: 10.1152/ajpcell.00171.2013] [Citation(s) in RCA: 131] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In older adults, changes in skeletal muscle composition are associated with increased fibrosis, loss of mass, and decreased force, which can lead to dependency, morbidity, and mortality. Understanding the biological mechanisms responsible is essential to sustaining and improving their quality of life. Compared with young mice, aged mice take longer to recover from muscle injury; their tissue fibrosis is more extensive, and regenerated myofibers are smaller. Strong evidence indicates that cells called pericytes, embedded in the basement membrane of capillaries, contribute to the satellite-cell pool and muscle growth. In addition to their role in skeletal muscle repair, after tissue damage, they detach from capillaries and migrate to the interstitial space to participate in fibrosis formation. Here we distinguish two bona fide pericyte subtypes in the skeletal muscle interstitium, type-1 (Nestin-GFP(-)/NG2-DsRed(+)) and type-2 (Nestin-GFP(+)/NG2-DsRed(+)), and characterize their heretofore unknown specific roles in the aging environment. Our in vitro results show that type-1 and type-2 pericytes are either fibrogenic or myogenic, respectively. Transplantation studies in young animals indicate that type-2 pericytes are myogenic, while type-1 pericytes remain in the interstitial space. In older mice, however, the muscular regenerative capacity of type-2 pericytes is limited, and type-1 pericytes produce collagen, contributing to fibrous tissue deposition. We conclude that in injured muscles from aging mice, the pericytes involved in skeletal muscle repair differ from those associated with scar formation.
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Affiliation(s)
- Alexander Birbrair
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina
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14
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Birbrair A, Zhang T, Wang ZM, Messi ML, Enikolopov GN, Mintz A, Delbono O. Role of pericytes in skeletal muscle regeneration and fat accumulation. Stem Cells Dev 2013; 22:2298-314. [PMID: 23517218 PMCID: PMC3730538 DOI: 10.1089/scd.2012.0647] [Citation(s) in RCA: 203] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2012] [Accepted: 03/20/2013] [Indexed: 02/06/2023] Open
Abstract
Stem cells ensure tissue regeneration, while overgrowth of adipogenic cells may compromise organ recovery and impair function. In myopathies and muscle atrophy associated with aging, fat accumulation increases dysfunction, and after chronic injury, the process of fatty degeneration, in which muscle is replaced by white adipocytes, further compromises tissue function and environment. Some studies suggest that pericytes may contribute to muscle regeneration as well as fat formation. This work reports the presence of two pericyte subpopulations in the skeletal muscle and characterizes their specific roles. Skeletal muscle from Nestin-GFP/NG2-DsRed mice show two types of pericytes, Nestin-GFP-/NG2-DsRed+ (type-1) and Nestin-GFP+/NG2-DsRed+ (type-2), in close proximity to endothelial cells. We also found that both Nestin-GFP-/NG2-DsRed+ and Nestin-GFP+/NG2-DsRed+ cells colocalize with staining of two pericyte markers, PDGFRβ and CD146, but only type-1 pericyte express the adipogenic progenitor marker PDGFRα. Type-2 pericytes participate in muscle regeneration, while type-1 contribute to fat accumulation. Transplantation studies indicate that type-1 pericytes do not form muscle in vivo, but contribute to fat deposition in the skeletal muscle, while type-2 pericytes contribute only to the new muscle formation after injury, but not to the fat accumulation. Our results suggest that type-1 and type-2 pericytes contribute to successful muscle regeneration which results from a balance of myogenic and nonmyogenic cells activation.
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MESH Headings
- Adipogenesis/genetics
- Animals
- Antigens/genetics
- Antigens/metabolism
- CD146 Antigen/genetics
- CD146 Antigen/metabolism
- Cell Lineage/genetics
- Endothelial Cells/cytology
- Female
- Gene Expression
- Genes, Reporter
- Green Fluorescent Proteins/genetics
- Green Fluorescent Proteins/metabolism
- Luminescent Proteins/genetics
- Luminescent Proteins/metabolism
- Male
- Mice
- Mice, Nude
- Mice, Transgenic
- Muscle, Skeletal/cytology
- Muscle, Skeletal/injuries
- Muscle, Skeletal/metabolism
- Nestin/genetics
- Nestin/metabolism
- Pericytes/cytology
- Pericytes/metabolism
- Pericytes/transplantation
- Proteoglycans/genetics
- Proteoglycans/metabolism
- Receptor, Platelet-Derived Growth Factor alpha/genetics
- Receptor, Platelet-Derived Growth Factor alpha/metabolism
- Receptor, Platelet-Derived Growth Factor beta/genetics
- Receptor, Platelet-Derived Growth Factor beta/metabolism
- Regeneration/genetics
- Red Fluorescent Protein
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Affiliation(s)
- Alexander Birbrair
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina
- Department of Neuroscience Program, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Tan Zhang
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Zhong-Min Wang
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Maria Laura Messi
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Grigori N. Enikolopov
- Cold Spring Harbor Laboratory, Cold Spring Harbor, New York
- NBIC, Moscow Institute of Physics and Technology, Moscow, Russia
| | - Akiva Mintz
- Department of Neurosurgery, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Osvaldo Delbono
- Department of Internal Medicine-Gerontology, Wake Forest School of Medicine, Winston-Salem, North Carolina
- Department of Neuroscience Program, Wake Forest School of Medicine, Winston-Salem, North Carolina
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15
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Nuclear tropomyosin and troponin in striated muscle: new roles in a new locale? J Muscle Res Cell Motil 2013; 34:275-84. [DOI: 10.1007/s10974-013-9356-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 07/23/2013] [Indexed: 01/03/2023]
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