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Tiwari V, Alam MJ, Bhatia M, Navya M, Banerjee SK. The structure and function of lamin A/C: Special focus on cardiomyopathy and therapeutic interventions. Life Sci 2024; 341:122489. [PMID: 38340979 DOI: 10.1016/j.lfs.2024.122489] [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: 11/11/2023] [Revised: 01/21/2024] [Accepted: 02/03/2024] [Indexed: 02/12/2024]
Abstract
Lamins are inner nuclear membrane proteins that belong to the intermediate filament family. Lamin A/C lie adjacent to the heterochromatin structure in polymer form, providing skeletal to the nucleus. Based on the localization, lamin A/C provides nuclear stability and cytoskeleton to the nucleus and modulates chromatin organization and gene expression. Besides being the structural protein making the inner nuclear membrane in polymer form, lamin A/C functions as a signalling molecule involved in gene expression as an enhancer inside the nucleus. Lamin A/C regulates various cellular pathways like autophagy and energy balance in the cytoplasm. Its expression is highly variable in differentiated tissues, higher in hard tissues like bone and muscle cells, and lower in soft tissues like the liver and brain. In muscle cells, including the heart, lamin A/C must be expressed in a balanced state. Lamin A/C mutation is linked with various diseases, such as muscular dystrophy, lipodystrophy, and cardiomyopathies. It has been observed that a good number of mutations in the LMNA gene impact cardiac activity and its function. Although several works have been published, there are still several unexplored areas left regarding the lamin A/C function and structure in the cardiovascular system and its pathological state. In this review, we focus on the structural organization, expression pattern, and function of lamin A/C, its interacting partners, and the pathophysiology associated with mutations in the lamin A/C gene, with special emphasis on cardiovascular diseases. With the recent finding on lamin A/C, we have summarized the possible therapeutic interventions to treat cardiovascular symptoms and reverse the molecular changes.
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Affiliation(s)
- Vikas Tiwari
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Guwahati 781101, Assam, India
| | - Md Jahangir Alam
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Guwahati 781101, Assam, India; Cell Biology and Physiology Division, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Madhavi Bhatia
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Guwahati 781101, Assam, India
| | - Malladi Navya
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Guwahati 781101, Assam, India
| | - Sanjay K Banerjee
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Guwahati 781101, Assam, India.
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He L, Liao J, Liu Z, Wang T, Zhou Y, Wang T, Lei B, Zhou G. Multi-omic analysis of mandibuloacral dysplasia type A patient iPSC-derived MSC senescence reveals miR-311 as a novel biomarker for MSC senescence. Hum Mol Genet 2023; 32:2872-2886. [PMID: 37427980 DOI: 10.1093/hmg/ddad111] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 06/23/2023] [Accepted: 06/02/2023] [Indexed: 07/11/2023] Open
Abstract
Mandibuloacral dysplasia type A (MADA) is a rare genetic progeroid syndrome associated with lamin A/C (LMNA) mutations. Pathogenic mutations of LMNA result in nuclear structural abnormalities, mesenchymal tissue damage and progeria phenotypes. However, it remains elusive how LMNA mutations cause mesenchymal-derived cell senescence and disease development. Here, we established an in vitro senescence model using induced pluripotent stem cell-derived mesenchymal stem cells (iMSCs) from MADA patients with homozygous LMNA p.R527C mutation. When expanded to passage 13 in vitro, R527C iMSCs exhibited marked senescence and attenuation of stemness potential, accompanied by immunophenotypic changes. Transcriptome and proteome analysis revealed that cell cycle, DNA replication, cell adhesion and inflammation might play important roles in senescence. In-depth evaluation of changes in extracellular vesicle (EV) derived iMSCs during senescence revealed that R527C iMSC-EVs could promote surrounding cell senescence by carrying pro-senescence microRNAs (miRNAs), including a novel miRNA called miR-311, which can serve as a new indicator for detecting chronic and acute mesenchymal stem cell (MSC) senescence and play a role in promoting senescence. Overall, this study advanced our understanding of the impact of LMNA mutations on MSC senescence and provided novel insights into MADA therapy as well as the link between chronic inflammation and aging development.
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Affiliation(s)
- Liangge He
- Guangdong Key Laboratory of Genomic Stability and Disease Prevention, Shenzhen Key Laboratory of Anti-Aging and Regenerative Medicine, Shenzhen Engineering Laboratory of Regenerative Technologies for Orthopedic Diseases, Department of Medical Cell Biology and Genetics, Shenzhen University Medical School, Shenzhen 518060, China
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen 518060, China
| | - Jinqi Liao
- Senotherapeutics Ltd, Hangzhou 311100, China
- Lungene Biotech Ltd, Shenzhen 518110, China
| | - Zhen Liu
- Guangdong Key Laboratory of Genomic Stability and Disease Prevention, Shenzhen Key Laboratory of Anti-Aging and Regenerative Medicine, Shenzhen Engineering Laboratory of Regenerative Technologies for Orthopedic Diseases, Department of Medical Cell Biology and Genetics, Shenzhen University Medical School, Shenzhen 518060, China
| | - Ting Wang
- Senotherapeutics Ltd, Hangzhou 311100, China
- Lungene Biotech Ltd, Shenzhen 518110, China
| | - Yan Zhou
- Guangdong Key Laboratory of Genomic Stability and Disease Prevention, Shenzhen Key Laboratory of Anti-Aging and Regenerative Medicine, Shenzhen Engineering Laboratory of Regenerative Technologies for Orthopedic Diseases, Department of Medical Cell Biology and Genetics, Shenzhen University Medical School, Shenzhen 518060, China
- Lungene Biotech Ltd, Shenzhen 518110, China
| | - Tianfu Wang
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen 518060, China
| | - Baiying Lei
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen 518060, China
| | - Guangqian Zhou
- Guangdong Key Laboratory of Genomic Stability and Disease Prevention, Shenzhen Key Laboratory of Anti-Aging and Regenerative Medicine, Shenzhen Engineering Laboratory of Regenerative Technologies for Orthopedic Diseases, Department of Medical Cell Biology and Genetics, Shenzhen University Medical School, Shenzhen 518060, China
- Senotherapeutics Ltd, Hangzhou 311100, China
- Lungene Biotech Ltd, Shenzhen 518110, China
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Bridger JM, Pereira RT, Pina C, Tosi S, Lewis A. Alterations to Genome Organisation in Stem Cells, Their Differentiation and Associated Diseases. Results Probl Cell Differ 2022; 70:71-102. [PMID: 36348105 DOI: 10.1007/978-3-031-06573-6_3] [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] [Indexed: 06/16/2023]
Abstract
The organisation of the genome in its home, the cell nucleus, is reliant on a number of different aspects to establish, maintain and alter its functional non-random positioning. The genome is dispersed throughout a cell nucleus in specific chromosome territories which are further divided into topologically associated domains (TADs), where regions of the genome from different and the same chromosomes come together. This organisation is both controlled by DNA and chromatin epigenetic modification and the association of the genome with nuclear structures such as the nuclear lamina, the nucleolus and nuclear bodies and speckles. Indeed, sequences that are associated with the first two structures mentioned are termed lamina-associated domains (LADs) and nucleolar-associated domains (NADs), respectively. The modifications and nuclear structures that regulate genome function are altered through a cell's life from stem cell to differentiated cell through to reversible quiescence and irreversible senescence, and hence impacting on genome organisation, altering it to silence specific genes and permit others to be expressed in a controlled way in different cell types and cell cycle statuses. The structures and enzymes and thus the organisation of the genome can also be deleteriously affected, leading to disease and/or premature ageing.
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Affiliation(s)
- Joanna M Bridger
- Division of Biosciences, Department of Life Sciences, Centre for Genome Engineering and Maintenance (cenGEM), College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge, UK.
| | - Rita Torres Pereira
- Division of Biosciences, Department of Life Sciences, Centre for Genome Engineering and Maintenance (cenGEM), College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge, UK
| | - Cristina Pina
- Division of Biosciences, Department of Life Sciences, Centre for Genome Engineering and Maintenance (cenGEM), College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge, UK
| | - Sabrina Tosi
- Division of Biosciences, Department of Life Sciences, Centre for Genome Engineering and Maintenance (cenGEM), College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge, UK
| | - Annabelle Lewis
- Division of Biosciences, Department of Life Sciences, Centre for Genome Engineering and Maintenance (cenGEM), College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge, UK
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Malashicheva A, Perepelina K. Diversity of Nuclear Lamin A/C Action as a Key to Tissue-Specific Regulation of Cellular Identity in Health and Disease. Front Cell Dev Biol 2021; 9:761469. [PMID: 34722546 PMCID: PMC8548693 DOI: 10.3389/fcell.2021.761469] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 09/20/2021] [Indexed: 12/12/2022] Open
Abstract
A-type lamins are the main structural components of the nucleus, which are mainly localized at the nucleus periphery. First of all, A-type lamins, together with B-type lamins and proteins of the inner nuclear membrane, form a stiff structure-the nuclear lamina. Besides maintaining the nucleus cell shape, A-type lamins play a critical role in many cellular events, such as gene transcription and epigenetic regulation. Nowadays it is clear that lamins play a very important role in determining cell fate decisions. Various mutations in genes encoding A-type lamins lead to damages of different types of tissues in humans, collectively known as laminopathies, and it is clear that A-type lamins are involved in the regulation of cell differentiation and stemness. However, the mechanisms of this regulation remain unclear. In this review, we discuss how A-type lamins can execute their regulatory role in determining the differentiation status of a cell. We have summarized recent data focused on lamin A/C action mechanisms in regulation of cell differentiation and identity development of stem cells of different origin. We also discuss how this knowledge can promote further research toward a deeper understanding of the role of lamin A/C mutations in laminopathies.
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Affiliation(s)
- Anna Malashicheva
- Laboratory of Regenerative Biomedicine, Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia
| | - Kseniya Perepelina
- Laboratory of Regenerative Biomedicine, Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia
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Xu Q, Miao Y, Ren J, Sun Y, Li C, Cai X, Wang Z. Silencing of Nesprin-2 inhibits the differentiation of myofibroblasts from fibroblasts induced by mechanical stretch. Int Wound J 2021; 19:978-986. [PMID: 34558192 PMCID: PMC9284660 DOI: 10.1111/iwj.13694] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/09/2021] [Accepted: 09/14/2021] [Indexed: 12/01/2022] Open
Abstract
Mechanical force plays a pivotal role in the pathogenesis of hypertrophic scar (HTS). Dermal fibroblasts and myofibroblasts are the key cells involved in HTS. Myofibroblasts in HTS possess different biochemical and biophysical characteristics by which myofibroblasts are often distinguished from fibroblasts. The role of mechanotransducers outside the nucleus in the pathogenesis of HTS has been reported in many studies. However, the role of Nesprin‐2 in HTS is not clear. Hence, we aim to construct a cell model of HTS and explore the role of Nesprin‐2 in this process. Myofibroblasts and fibroblasts were isolated from HTS and healthy skin tissues of the same patient. Fibroblasts were exposed to cyclic stretch with 10% magnitude and a frequency of 0.1 Hz for 3 days, 5 days, and 7 days, respectively. After the cell model was confirmed, fibroblasts transfected with siRNA targeting human Nesprin‐2 were exposed to cyclic stretch. The mechanical behaviour and biochemical reaction of the dermal fibroblasts were analysed. The stretched fibroblasts at day 5 showed the same mechanotransductive and biochemical features as unstretched myofibroblasts. Mechanical strain could induce the myofibroblasts differentiation and a cell model of HTS was established successfully at day 5. The expressions of lamin A/C, alpha‐smooth muscle actin, transforming growth factor beta 1, and collagen type I in fibroblasts were reduced by the silencing of Nesprin‐2. Mechanical strain could induce the myofibroblasts differentiation and silencing of Nesprin‐2 could block the mechanical stimulation of terminal myofibroblasts differentiation. Nesprin‐2 might be a potential target to treat the HTS.
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Affiliation(s)
- Quanchen Xu
- Department of Stomatology, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Yuanxin Miao
- Department of Burn and Plastic Surgery, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Jizheng Ren
- Department of Burn and Plastic Surgery, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Yu Sun
- Department of Burn and Plastic Surgery, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Cong Li
- Department of Burn and Plastic Surgery, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Xia Cai
- Department of Burn and Plastic Surgery, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Zhiguo Wang
- Department of Burn and Plastic Surgery, the Affiliated Hospital of Qingdao University, Qingdao, China
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Kostina A, Lobov A, Semenova D, Kiselev A, Klausen P, Malashicheva A. Context-Specific Osteogenic Potential of Mesenchymal Stem Cells. Biomedicines 2021; 9:biomedicines9060673. [PMID: 34204737 PMCID: PMC8231580 DOI: 10.3390/biomedicines9060673] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 05/28/2021] [Accepted: 06/10/2021] [Indexed: 11/16/2022] Open
Abstract
Despite the great progress in the field of bone tissue regeneration, the early initiating mechanisms of osteogenic differentiation are not well understood. Cells capable of osteogenic transformation vary from mesenchymal stem cells of various origins to mural cells of vessels. The mechanisms of pathological calcification are thought to be similar to those of bone formation. Notch signaling has been shown to play an important role in osteogenic differentiation, as well as in pathological calcification. Nevertheless, despite its known tissue- and context-specificity, the information about its role in the osteogenic differentiation of different cells is still limited. We compared mesenchymal stem cells from adipogenic tissue (MSCs) and interstitial cells from the aortic valve (VICs) by their ability to undergo Notch-dependent osteogenic differentiation. We showed differences between the two types of cells in their ability to activate the expression of proosteogenic genes RUNX2, BMP2, BMP4, DLX2, BGLAP, SPRY, IBSP, and SPP1 in response to Notch activation. Untargeted metabolomic profiling also confirms differences between MSCs and VICs in their osteogenic state. Analysis of the activity of RUNX2 and SPP1 promoters shows fine-tuned dose-dependency in response to Notch induction and suggests a direct link between the level of Notch activation, and the proostogenic gene expression and corresponding osteogenic induction. Our data suggest that osteogenic differentiation is a context-dependent process and the outcome of it could be cell-type dependent.
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Tao J, Duan J, Pi X, Wang H, Li S. A splicing LMNA mutation causing laminopathies accompanied by aortic valve malformation. J Clin Lab Anal 2021; 35:e23736. [PMID: 33626194 DOI: 10.1002/jcla.23736] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 01/25/2021] [Accepted: 01/26/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Laminopathies caused by LMNA gene mutations are characterized by different clinical manifestations. Among them, cardiac involvement is one of the most severe phenotypes. CASE PRESENTATION A 30-year-old man visited the hospital because of palpitations, shortness of breath, and fatigue. He also had muscular dystrophy, joint contractures, scoliosis, and mild dysphagia. A novel de novo heterozygous LMNA splice variant (c.810+1G>T) with dilated cardiomyopathy, Emery-Dreifuss muscular dystrophy, and progressive cardiac conduction defect was identified by genetic analysis. The patient also presented with congenital aortic valve malformation, which has never been reported in laminopathies. CONCLUSIONS The LMNA mutation (c.810+1G>T) was identified for the first time, enriching the mutation spectrum of the LMNA gene. The correlation between an LMNA mutation and congenital aortic valve malformation deserves further study.
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Affiliation(s)
- Jingwen Tao
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanism of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Jialin Duan
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanism of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Xiu Pi
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanism of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Hong Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanism of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Sheng Li
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanism of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
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Ignatieva EV, Ivanova OA, Komarova MY, Khromova NV, Polev DE, Kostareva AA, Sergushichev A, Dmitrieva RI. LMNA Mutations G232E and R482L Cause Dysregulation of Skeletal Muscle Differentiation, Bioenergetics, and Metabolic Gene Expression Profile. Genes (Basel) 2020; 11:E1057. [PMID: 32906763 PMCID: PMC7563596 DOI: 10.3390/genes11091057] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 08/30/2020] [Accepted: 09/01/2020] [Indexed: 02/06/2023] Open
Abstract
Laminopathies are a family of monogenic multi-system diseases resulting from mutations in the LMNA gene which include a wide range of neuromuscular disorders. Although lamins are expressed in most types of differentiated cells, LMNA mutations selectively affect only specific tissues by mechanisms that remain largely unknown. We have employed the combination of functional in vitro experiments and transcriptome analysis in order to determine how two LMNA mutations associated with different phenotypes affect skeletal muscle development and metabolism. We used a muscle differentiation model based on C2C12 mouse myoblasts genetically modified with lentivirus constructs bearing wild-type human LMNA (WT-LMNA) or R482L-LMNA/G232E-LMNA mutations, linked to familial partial lipodystrophy of the Dunnigan type and muscular dystrophy phenotype accordingly. We have shown that both G232E/R482L-LMNA mutations cause dysregulation in coordination of pathways that control cell cycle dynamics and muscle differentiation. We have also found that R482/G232E-LMNA mutations induce mitochondrial uncoupling and a decrease in glycolytic activity in differentiated myotubes. Both types of alterations may contribute to mutation-induced muscle tissue pathology.
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Affiliation(s)
- Elena V. Ignatieva
- National Almazov Medical Research Centre, Institute of Molecular Biology and Genetics, 197341 Saint-Petersburg, Russia; (E.V.I.); (O.A.I.); (M.Y.K.); (N.V.K.); (A.A.K.)
| | - Oksana A. Ivanova
- National Almazov Medical Research Centre, Institute of Molecular Biology and Genetics, 197341 Saint-Petersburg, Russia; (E.V.I.); (O.A.I.); (M.Y.K.); (N.V.K.); (A.A.K.)
- ITMO University, Information Technologies and Programming Faculty, International Laboratory of Bioinformatics and Genomics, 197101 St. Petersburg, Russia;
| | - Margarita Y. Komarova
- National Almazov Medical Research Centre, Institute of Molecular Biology and Genetics, 197341 Saint-Petersburg, Russia; (E.V.I.); (O.A.I.); (M.Y.K.); (N.V.K.); (A.A.K.)
| | - Natalia V. Khromova
- National Almazov Medical Research Centre, Institute of Molecular Biology and Genetics, 197341 Saint-Petersburg, Russia; (E.V.I.); (O.A.I.); (M.Y.K.); (N.V.K.); (A.A.K.)
| | - Dmitrii E. Polev
- Research Resource Center “Biobank”, St Petersburg State University, 199034 Saint-Petersburg, Russia;
| | - Anna A. Kostareva
- National Almazov Medical Research Centre, Institute of Molecular Biology and Genetics, 197341 Saint-Petersburg, Russia; (E.V.I.); (O.A.I.); (M.Y.K.); (N.V.K.); (A.A.K.)
| | - Alexey Sergushichev
- ITMO University, Information Technologies and Programming Faculty, International Laboratory of Bioinformatics and Genomics, 197101 St. Petersburg, Russia;
| | - Renata I. Dmitrieva
- National Almazov Medical Research Centre, Institute of Molecular Biology and Genetics, 197341 Saint-Petersburg, Russia; (E.V.I.); (O.A.I.); (M.Y.K.); (N.V.K.); (A.A.K.)
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Alcorta-Sevillano N, Macías I, Rodríguez CI, Infante A. Crucial Role of Lamin A/C in the Migration and Differentiation of MSCs in Bone. Cells 2020; 9:cells9061330. [PMID: 32466483 PMCID: PMC7348862 DOI: 10.3390/cells9061330] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 05/22/2020] [Accepted: 05/25/2020] [Indexed: 12/17/2022] Open
Abstract
Lamin A/C, intermediate filament proteins from the nuclear lamina encoded by the LMNA gene, play a central role in mediating the mechanosignaling of cytoskeletal forces into nucleus. In fact, this mechanotransduction process is essential to ensure the proper functioning of other tasks also mediated by lamin A/C: the structural support of the nucleus and the regulation of gene expression. In this way, lamin A/C is fundamental for the migration and differentiation of mesenchymal stem cells (MSCs), the progenitors of osteoblasts, thus affecting bone homeostasis. Bone formation is a complex process regulated by chemical and mechanical cues, coming from the surrounding extracellular matrix. MSCs respond to signals modulating the expression levels of lamin A/C, and therefore, adapting their nuclear shape and stiffness. To promote cell migration, MSCs need soft nuclei with low lamin A content. Conversely, during osteogenic differentiation, lamin A/C levels are known to be increased. Several LMNA mutations present a negative impact in the migration and osteogenesis of MSCs, affecting bone tissue homeostasis and leading to pathological conditions. This review aims to describe these concepts by discussing the latest state-of-the-art in this exciting area, focusing on the relationship between lamin A/C in MSCs' function and bone tissue from both, health and pathological points of view.
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Marschall MT, Simnacher U, Walther P, Essig A, Hagemann JB. The Putative Type III Secreted Chlamydia abortus Virulence-Associated Protein CAB063 Targets Lamin and Induces Apoptosis. Front Microbiol 2020; 11:1059. [PMID: 32523581 PMCID: PMC7261910 DOI: 10.3389/fmicb.2020.01059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 04/29/2020] [Indexed: 01/15/2023] Open
Abstract
Since intracellular survival of all chlamydiae depends on the manipulation of the host cell through type III secreted effector proteins, their characterization is crucial for the understanding of chlamydial pathogenesis. We functionally characterized the putative type III secreted Chlamydia abortus protein CAB063, describe its intracellular localization and identified pro- and eukaryotic binding partners. Based on an experimental infection model and plasmid transfections, we investigated the subcellular localization of CAB063 by immunofluorescence microscopy, immunoelectron microscopy, and Western blot analysis. Pro- and eukaryotic targets were identified by co-immunofluorescence, co-immunoprecipitation, and mass spectrometry. Transmission electron microscopy and flow cytometry were used for morphological and functional investigations on host cell apoptosis. CAB063 localized in the nuclear membrane of the host cell nucleus and we identified the chaperone HSP70 and lamin A/C as pro- and eukaryotic targets, respectively. CAB063-dependent morphological alterations of the host cell nucleus correlated with increased apoptosis rates of infected and CAB063-transfected cells. We provide evidence that CAB063 is a chaperone-folded type III secreted C. abortus virulence factor that targets lamin thereby altering the host cell nuclear membrane structure. This process may be responsible for an increased apoptosis rate at the end of the chlamydial developmental cycle, at which CAB063 is physiologically expressed.
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Affiliation(s)
| | - Ulrike Simnacher
- Institute of Medical Microbiology and Hygiene, Ulm University Hospital, Ulm, Germany
| | - Paul Walther
- Central Facility for Electron Microscopy, Ulm University, Ulm, Germany
| | - Andreas Essig
- Institute of Medical Microbiology and Hygiene, Ulm University Hospital, Ulm, Germany
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