1
|
Wu W, Jin Q, Östlund C, Tanji K, Shin JY, Han J, Leu CS, Kushner J, Worman HJ. mTOR Inhibition Prolongs Survival and Has Beneficial Effects on Heart Function After Onset of Lamin A/C Gene Mutation Cardiomyopathy in Mice. Circ Heart Fail 2024; 17:e011110. [PMID: 38567527 PMCID: PMC11008450 DOI: 10.1161/circheartfailure.123.011110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 02/12/2024] [Indexed: 04/04/2024]
Abstract
BACKGROUND Mutations in LMNA encoding nuclear envelope proteins lamin A/C cause dilated cardiomyopathy. Activation of the AKT/mTOR (RAC-α serine/threonine-protein kinase/mammalian target of rapamycin) pathway is implicated as a potential pathophysiologic mechanism. The aim of this study was to assess whether pharmacological inhibition of mTOR signaling has beneficial effects on heart function and prolongs survival in a mouse model of the disease, after onset of heart failure. METHODS We treated male LmnaH222P/H222P mice, after the onset of heart failure, with placebo or either of 2 orally bioavailable mTOR inhibitors: everolimus or NV-20494, a rapamycin analog highly selective against mTORC1. We examined left ventricular remodeling, and the cell biological, biochemical, and histopathologic features of cardiomyopathy, potential drug toxicity, and survival. RESULTS Everolimus treatment (n=17) significantly reduced left ventricular dilatation and increased contractility on echocardiography, with a 7% (P=0.018) reduction in left ventricular end-diastolic diameter and a 39% (P=0.0159) increase fractional shortening compared with placebo (n=17) after 6 weeks of treatment. NV-20494 treatment (n=15) yielded similar but more modest and nonsignificant changes. Neither drug prevented the development of cardiac fibrosis. Drug treatment reactivated suppressed autophagy and inhibited mTORC1 signaling in the heart, although everolimus was more potent. With regards to drug toxicity, everolimus alone led to a modest degree of glucose intolerance during glucose challenge. Everolimus (n=20) and NV-20494 (n=20) significantly prolonged median survival in LmnaH222P/H222P mice, by 9% (P=0.0348) and 11% (P=0.0206), respectively, compared with placebo (n=20). CONCLUSIONS These results suggest that mTOR inhibitors may be beneficial in patients with cardiomyopathy caused by LMNA mutations and that further study is warranted.
Collapse
Affiliation(s)
- Wei Wu
- Department of Medicine, Vagelos College of Physicians and Surgeons, (W.W., Q.J., C.Ö., J.-Y.S., J.K., H.J.W.), Columbia University, New York, NY
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons (W.W., Q.J., C.Ö., K.T., H.J.W.), Columbia University, New York, NY
| | - Qi Jin
- Department of Medicine, Vagelos College of Physicians and Surgeons, (W.W., Q.J., C.Ö., J.-Y.S., J.K., H.J.W.), Columbia University, New York, NY
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons (W.W., Q.J., C.Ö., K.T., H.J.W.), Columbia University, New York, NY
| | - Cecilia Östlund
- Department of Medicine, Vagelos College of Physicians and Surgeons, (W.W., Q.J., C.Ö., J.-Y.S., J.K., H.J.W.), Columbia University, New York, NY
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons (W.W., Q.J., C.Ö., K.T., H.J.W.), Columbia University, New York, NY
| | - Kurenai Tanji
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons (W.W., Q.J., C.Ö., K.T., H.J.W.), Columbia University, New York, NY
| | - Ji-Yeon Shin
- Department of Medicine, Vagelos College of Physicians and Surgeons, (W.W., Q.J., C.Ö., J.-Y.S., J.K., H.J.W.), Columbia University, New York, NY
| | - Jiying Han
- Department of Biostatistics, Mailman School of Public Health (J.H., C.-S.L.), Columbia University, New York, NY
| | - Cheng-Shiun Leu
- Department of Biostatistics, Mailman School of Public Health (J.H., C.-S.L.), Columbia University, New York, NY
| | - Jared Kushner
- Department of Medicine, Vagelos College of Physicians and Surgeons, (W.W., Q.J., C.Ö., J.-Y.S., J.K., H.J.W.), Columbia University, New York, NY
| | - Howard J. Worman
- Department of Medicine, Vagelos College of Physicians and Surgeons, (W.W., Q.J., C.Ö., J.-Y.S., J.K., H.J.W.), Columbia University, New York, NY
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons (W.W., Q.J., C.Ö., K.T., H.J.W.), Columbia University, New York, NY
| |
Collapse
|
2
|
Hernandez-Ono A, Zhao YP, Murray JW, Östlund C, Lee MJ, Shi A, Dauer WT, Worman HJ, Ginsberg HN, Shin JY. Dynamic regulation of hepatic lipid metabolism by torsinA and its activators. JCI Insight 2024; 9:e175328. [PMID: 38194265 DOI: 10.1172/jci.insight.175328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 12/21/2023] [Indexed: 01/10/2024] Open
Abstract
Depletion of torsinA from hepatocytes leads to reduced liver triglyceride secretion and marked hepatic steatosis. TorsinA is an atypical ATPase that lacks intrinsic activity unless it is bound to its activator, lamina-associated polypeptide 1 (LAP1) or luminal domain-like LAP1 (LULL1). We previously demonstrated that depletion of LAP1 from hepatocytes has more modest effects on liver triglyceride secretion and steatosis development than depletion of torsinA. We now show that depletion of LULL1 alone does not significantly decrease triglyceride secretion or cause steatosis. However, simultaneous depletion of both LAP1 and LULL1 leads to defective triglyceride secretion and marked steatosis similar to that observed with depletion of torsinA. Depletion of both LAP1 and torsinA from hepatocytes generated phenotypes similar to those observed with only torsinA depletion, implying that the 2 proteins act in the same pathway in liver lipid metabolism. Our results demonstrate that torsinA and its activators dynamically regulate hepatic lipid metabolism.
Collapse
Affiliation(s)
| | | | - John W Murray
- Department of Medicine
- Columbia Center for Human Development, and
| | - Cecilia Östlund
- Department of Medicine
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Michael J Lee
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Angsi Shi
- Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, New York, USA
| | - William T Dauer
- Peter O'Donnell Jr. Brain Institute
- Department of Neurology, and
- Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Howard J Worman
- Department of Medicine
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | | | | |
Collapse
|
3
|
Hernandez-Ono A, Zhao YP, Murray JW, Östlund C, Lee MJ, Shi A, Dauer WT, Worman HJ, Ginsberg HN, Shin JY. Functional interaction of torsinA and its activators in liver lipid metabolism. bioRxiv 2023:2023.06.21.545957. [PMID: 37547008 PMCID: PMC10401926 DOI: 10.1101/2023.06.21.545957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
TorsinA is an atypical ATPase that lacks intrinsic activity unless it is bound to its activators lamina-associated polypeptide 1 (LAP1) in the perinuclear space or luminal domain-like LAP1 (LULL1) throughout the endoplasmic reticulum. However, the interaction of torsinA with LAP1 and LULL1 has not yet been shown to modulate a defined physiological process in mammals in vivo . We previously demonstrated that depletion of torsinA from mouse hepatocytes leads to reduced liver triglyceride secretion and marked steatosis, whereas depletion of LAP1 had more modest similar effects. We now show that depletion of LULL1 alone does not significantly decrease liver triglyceride secretion or cause steatosis. However, simultaneous depletion of both LAP1 and LULL1 from hepatocytes leads to defective triglyceride secretion and marked steatosis similar to that observed with depletion of torsinA. Our results demonstrate that torsinA and its activators dynamically regulate a physiological process in mammals in vivo .
Collapse
|
4
|
Östlund C, Hernandez-Ono A, Turk SJ, Dauer WT, Ginsberg HN, Worman HJ, Shin JY. Hepatocytes Deficient in Nuclear Envelope Protein Lamina-associated Polypeptide 1 are an Ideal Mammalian System to Study Intranuclear Lipid Droplets. J Lipid Res 2022; 63:100277. [PMID: 36100089 PMCID: PMC9587410 DOI: 10.1016/j.jlr.2022.100277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 09/06/2022] [Accepted: 09/07/2022] [Indexed: 01/21/2023] Open
Abstract
Lipid droplets (LDs) are generally considered to be synthesized in the ER and utilized in the cytoplasm. However, LDs have been observed inside nuclei in some cells, although recent research on nuclear LDs has focused on cultured cell lines. To better understand nuclear LDs that occur in vivo, here we examined LDs in primary hepatocytes from mice following depletion of the nuclear envelope protein lamina-associated polypeptide 1 (LAP1). Microscopic image analysis showed that LAP1-depleted hepatocytes contain frequent nuclear LDs, which differ from cytoplasmic LDs in their associated proteins. We found type 1 nucleoplasmic reticula, which are invaginations of the inner nuclear membrane, are often associated with nuclear LDs in these hepatocytes. Furthermore, in vivo depletion of the nuclear envelope proteins lamin A and C from mouse hepatocytes led to severely abnormal nuclear morphology, but significantly fewer nuclear LDs than were observed upon depletion of LAP1. In addition, we show both high-fat diet feeding and fasting of mice increased cytoplasmic lipids in LAP1-depleted hepatocytes but reduced nuclear LDs, demonstrating a relationship of LD formation with nutritional state. Finally, depletion of microsomal triglyceride transfer protein did not change the frequency of nuclear LDs in LAP1-depleted hepatocytes, suggesting that it is not required for the biogenesis of nuclear LDs in these cells. Together, these data show that LAP1-depleted hepatocytes represent an ideal mammalian system to investigate the biogenesis of nuclear LDs and their partitioning between the nucleus and cytoplasm in response to changes in nutritional state and cellular metabolism in vivo.
Collapse
Affiliation(s)
- Cecilia Östlund
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA,Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Antonio Hernandez-Ono
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Samantha J. Turk
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA,Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - William T. Dauer
- Peter O’Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA,Department of Neurology, University of Texas Southwestern Medical Center, Dallas, TX, USA,Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Henry N. Ginsberg
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Howard J. Worman
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA,Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Ji-Yeon Shin
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA,For correspondence: Ji-Yeon Shin
| |
Collapse
|
5
|
Östlund C, Hernandez-Ono A, Shin JY. The Nuclear Envelope in Lipid Metabolism and Pathogenesis of NAFLD. Biology (Basel) 2020; 9:biology9100338. [PMID: 33076344 PMCID: PMC7602593 DOI: 10.3390/biology9100338] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 10/09/2020] [Accepted: 10/12/2020] [Indexed: 02/06/2023]
Abstract
Simple Summary The liver is a major organ regulating lipid metabolism and a proper liver function is essential to health. Nonalcoholic fatty liver disease (NAFLD) is a condition with abnormal fat accumulation in the liver without heavy alcohol use. NAFLD is becoming one of the most common liver diseases with the increase in obesity in many parts of the world. There is no approved cure for the disease and a better understanding of disease mechanism is needed for effective prevention and treatment. The nuclear envelope, a membranous structure that surrounds the cell nucleus, is connected to the endoplasmic reticulum where the vast majority of cellular lipids are synthesized. Growing evidence indicates that components in the nuclear envelope are involved in cellular lipid metabolism. We review published studies with various cell and animal models, indicating the essential roles of nuclear envelope proteins in lipid metabolism. We also discuss how defects in these proteins affect cellular lipid metabolism and possibly contribute to the pathogenesis of NAFLD. Abstract Nonalcoholic fatty liver disease (NAFLD) is a burgeoning public health problem worldwide. Despite its tremendous significance for public health, we lack a comprehensive understanding of the pathogenic mechanisms of NAFLD and its more advanced stage, nonalcoholic steatohepatitis (NASH). Identification of novel pathways or cellular mechanisms that regulate liver lipid metabolism has profound implications for the understanding of the pathology of NAFLD and NASH. The nuclear envelope is topologically connected to the ER, where protein synthesis and lipid synthesis occurs. Emerging evidence points toward that the nuclear lamins and nuclear membrane-associated proteins are involved in lipid metabolism and homeostasis. We review published reports that link these nuclear envelope proteins to lipid metabolism. In particular, we focus on the recent work demonstrating the essential roles for the nuclear envelope-localized torsinA/lamina-associated polypeptide (LAP1) complex in hepatic steatosis, lipid secretion, and NASH development. We also discuss plausible pathogenic mechanisms by which the loss of either protein in hepatocytes leads to hepatic dyslipidemia and NASH development.
Collapse
Affiliation(s)
- Cecilia Östlund
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA; (C.Ö.); (A.H.-O.)
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Antonio Hernandez-Ono
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA; (C.Ö.); (A.H.-O.)
| | - Ji-Yeon Shin
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA; (C.Ö.); (A.H.-O.)
- Correspondence: ; Tel.: +1-212-305-4088
| |
Collapse
|
6
|
Shin JY, Hernandez-Ono A, Fedotova T, Östlund C, Lee MJ, Gibeley SB, Liang CC, Dauer WT, Ginsberg HN, Worman HJ. Nuclear envelope-localized torsinA-LAP1 complex regulates hepatic VLDL secretion and steatosis. J Clin Invest 2019; 129:4885-4900. [PMID: 31408437 PMCID: PMC6819140 DOI: 10.1172/jci129769] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 08/07/2019] [Indexed: 12/15/2022] Open
Abstract
Deciphering novel pathways regulating liver lipid content has profound implications for understanding the pathophysiology of nonalcoholic fatty liver disease and nonalcoholic steatohepatitis. Recent evidence suggests that the nuclear envelope is a site of regulation of lipid metabolism but there is limited appreciation of the responsible mechanisms and molecular components within this organelle. We showed that conditional hepatocyte deletion of the inner nuclear membrane protein lamina-associated polypeptide 1 (LAP1) caused defective VLDL secretion and steatosis, including intranuclear lipid accumulation. LAP1 binds to and activates torsinA, an AAA+ ATPase that resides in the perinuclear space and continuous main ER. Deletion of torsinA from mouse hepatocytes caused even greater reductions in VLDL secretion and profound steatosis. Both of these mutant mouse lines developed hepatic steatosis and subsequent steatohepatitis on a regular chow diet in the absence of whole-body insulin resistance or obesity. Our results establish an essential role for the nuclear envelope-localized torsinA-LAP1 complex in hepatic VLDL secretion and suggest that the torsinA pathway participates in the pathophysiology of nonalcoholic fatty liver disease.
Collapse
Affiliation(s)
- Ji-Yeon Shin
- Department of Medicine, and
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | | | | | - Cecilia Östlund
- Department of Medicine, and
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | - Michael J. Lee
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | | | | | - William T. Dauer
- Department of Neurology, and
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | | | - Howard J. Worman
- Department of Medicine, and
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA
| |
Collapse
|
7
|
Östlund C, Chang W, Gundersen GG, Worman HJ. Pathogenic mutations in genes encoding nuclear envelope proteins and defective nucleocytoplasmic connections. Exp Biol Med (Maywood) 2019; 244:1333-1344. [PMID: 31299860 DOI: 10.1177/1535370219862243] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Mutations in genes encoding nuclear lamins and associated nuclear envelope proteins have been linked to a broad range of inherited diseases affecting different tissues and organs. These diseases are often referred to as laminopathies. Scientists have yet to elucidate exactly how pathogenic mutations leading to alteration of a nuclear envelope protein cause disease. Our relatively recent research has shown that pathogenic mutations in genes encoding nuclear envelope proteins lead to defective nucleocytoplasmic connections that disrupt proper functioning of the linker of nucleoskeleton and cytoskeleton complex in the establishment of cell polarity. These defects may explain, at least in part, pathogenic mechanisms underlying laminopathies.Impact statementMutations in genes encoding nuclear lamins and associated nuclear envelope proteins have been linked to several diseases affecting different tissues and organs. The pathogenic mechanisms underlying these diseases, often called laminopathies, remain poorly understood. Increased knowledge of the functions of different nuclear envelope proteins and the interactions between them is crucial to elucidate these disease mechanisms. Our research has shown that pathogenic mutations in genes encoding nuclear envelope proteins lead to defective nucleocytoplasmic connections that disrupt proper functioning of the linker of nucleoskeleton and cytoskeleton (LINC) complex in the establishment of cell polarity. These defects may contribute to the pathogenesis of laminopathies and provide novel targets for therapeutics.
Collapse
Affiliation(s)
- Cecilia Östlund
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.,Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Wakam Chang
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Gregg G Gundersen
- Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Howard J Worman
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.,Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| |
Collapse
|
8
|
Ginsberg H, Shin J, Hernandez-Ono A, Fedotova T, Gilbeley S, Östlund C, Lee M, Dauer W, Worman H. Loss of function of either LAP1 or torsina, nuclear membrane associated proteins, causes inhibition of VLDL secretion and severe steatohepatitis in chow fed mice. Atherosclerosis 2018. [DOI: 10.1016/j.atherosclerosis.2018.06.177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
9
|
Wang Y, Lichter-Konecki U, Anyane-Yeboa K, Shaw JE, Lu JT, Östlund C, Shin JY, Clark LN, Gundersen GG, Nagy PL, Worman HJ. A mutation abolishing the ZMPSTE24 cleavage site in prelamin A causes a progeroid disorder. J Cell Sci 2016; 129:1975-80. [PMID: 27034136 DOI: 10.1242/jcs.187302] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 03/29/2016] [Indexed: 12/18/2022] Open
Abstract
In 1994 in the Journal of Cell Science, Hennekes and Nigg reported that changing valine to arginine at the endoproteolytic cleavage site in chicken prelamin A abolishes its conversion to lamin A. The consequences of this mutation in an organism have remained unknown. We now report that the corresponding mutation in a human subject leads to accumulation of prelamin A and causes a progeroid disorder. Next generation sequencing of the subject and her parents' exomes identified a de novo mutation in the lamin A/C gene (LMNA) that resulted in a leucine to arginine amino acid substitution at residue 647 in prelamin A. The subject's fibroblasts accumulated prelamin A, a farnesylated protein, which led to an increased percentage of cultured cells with morphologically abnormal nuclei. Treatment with a protein farnesyltransferase inhibitor improved abnormal nuclear morphology. This case demonstrates that accumulation of prelamin A, independent of the loss of function of ZMPSTE24 metallopeptidase that catalyzes processing of prelamin A, can cause a progeroid disorder and that a cell biology assay could be used in precision medicine to identify a potential therapy.
Collapse
Affiliation(s)
- Yuexia Wang
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Uta Lichter-Konecki
- Department of Pediatrics, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Kwame Anyane-Yeboa
- Department of Pediatrics, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Jessica E Shaw
- Department of Pediatrics, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Jonathan T Lu
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Cecilia Östlund
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Ji-Yeon Shin
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Lorraine N Clark
- Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Gregg G Gundersen
- Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Peter L Nagy
- Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Howard J Worman
- Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| |
Collapse
|
10
|
Herrada I, Samson C, Velours C, Renault L, Östlund C, Chervy P, Puchkov D, Worman HJ, Buendia B, Zinn-Justin S. Muscular Dystrophy Mutations Impair the Nuclear Envelope Emerin Self-assembly Properties. ACS Chem Biol 2015; 10:2733-42. [PMID: 26415001 DOI: 10.1021/acschembio.5b00648] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
More than 100 genetic mutations causing X-linked Emery-Dreifuss muscular dystrophy have been identified in the gene encoding the integral inner nuclear membrane protein emerin. Most mutations are nonsense or frameshift mutations that lead to the absence of emerin in cells. Only very few cases are due to missense or short in-frame deletions. Molecular mechanisms explaining the corresponding emerin variants' loss of function are particularly difficult to identify because of the mostly intrinsically disordered state of the emerin nucleoplasmic region. We now demonstrate that this EmN region can be produced as a disordered monomer, as revealed by nuclear magnetic resonance, but rapidly self-assembles in vitro. Increases in concentration and temperature favor the formation of long curvilinear filaments with diameters of approximately 10 nm, as observed by electron microscopy. Assembly of these filaments can be followed by fluorescence through Thioflavin-T binding and by Fourier-transform Infrared spectrometry through formation of β-structures. Analysis of the assembly properties of five EmN variants reveals that del95-99 and Q133H impact filament assembly capacities. In cells, these variants are located at the nuclear envelope, but the corresponding quantities of emerin-emerin and emerin-lamin proximities are decreased compared to wild-type protein. Furthermore, variant P183H favors EmN aggregation in vitro, and variant P183T provokes emerin accumulation in cytoplasmic foci in cells. Substitution of residue Pro183 might systematically favor oligomerization, leading to emerin aggregation and mislocalization in cells. Our results suggest that emerin self-assembly is necessary for its proper function and that a loss of either the protein itself or its ability to self-assemble causes muscular dystrophy.
Collapse
Affiliation(s)
- Isaline Herrada
- Laboratoire
de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CEA Saclay Bât. 144, 91191 Gif-sur-Yvette Cedex, France
| | - Camille Samson
- Laboratoire
de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CEA Saclay Bât. 144, 91191 Gif-sur-Yvette Cedex, France
| | - Christophe Velours
- Laboratoire
d’Enzymologie et Biochimie Structurales, Institute for Integrative Biology of the Cell (I2BC), CNRS Bât.34, 1 avenue de
la terrasse, 91190 Gif-sur-Yvette, France
| | - Louis Renault
- Laboratoire
d’Enzymologie et Biochimie Structurales, Institute for Integrative Biology of the Cell (I2BC), CNRS Bât.34, 1 avenue de
la terrasse, 91190 Gif-sur-Yvette, France
| | - Cecilia Östlund
- Department
of Medicine and Department of Pathology and Cell Biology, College
of Physicians and Surgeons, Columbia University, 630 West 168th Street, New York, New York 10032, United States
| | - Pierre Chervy
- Laboratoire
de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CEA Saclay Bât. 144, 91191 Gif-sur-Yvette Cedex, France
| | - Dmytro Puchkov
- Department
of Molecular Pharmacology and Cell Biology, Leibniz-Institut für Molecular Pharmakologie (FMP), 13125 Berlin, Germany
| | - Howard J Worman
- Department
of Medicine and Department of Pathology and Cell Biology, College
of Physicians and Surgeons, Columbia University, 630 West 168th Street, New York, New York 10032, United States
| | - Brigitte Buendia
- Laboratoire
de Physiologie du Muscle Strié, Université Paris Diderot-Paris 7, CNRS, UMR 8251, Institut de Biologie
Fonctionnelle et Adaptative, 4 rue
M.A. Lagroua Weill Halle, 75205 Paris Cedex 13, France
| | - Sophie Zinn-Justin
- Laboratoire
de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CEA Saclay Bât. 144, 91191 Gif-sur-Yvette Cedex, France
| |
Collapse
|
11
|
Chang W, Antoku S, Östlund C, Worman HJ, Gundersen GG. Linker of nucleoskeleton and cytoskeleton (LINC) complex-mediated actin-dependent nuclear positioning orients centrosomes in migrating myoblasts. Nucleus 2015; 6:77-88. [PMID: 25587885 DOI: 10.1080/19491034.2015.1004947] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
Myoblast migration is essential for muscle development and repair; however, the factors that contribute to the polarity of migrating myoblasts are relatively unknown. We find that randomly migrating C2C12 myoblasts orient their centrosomes in the direction of migration. Using wounded monolayers, we further show that centrosome orientation is stimulated by the serum factor lysophosphatidic acid (LPA) and involves the rearward movement of the nucleus while the centrosome is maintained at the cell centroid. The rate of nuclear movement correlated with that of actin retrograde flow and both cytochalasin D and blebbistatin prevented nuclear movement and centrosome orientation. Actin-dependent rearward nuclear movement in fibroblasts is mediated by assembly of nuclear membrane nesprin-2G and SUN2 LINC complexes into transmembrane actin-associated nuclear (TAN) lines anchored by A-type lamins and emerin. In C2C12 myoblasts, depletion of nesprin-2G, SUN2 or lamin A/C prevented nuclear movement and endogenous nesprin-2G and a chimeric GFP-mini-nesprin-2G formed TAN lines during nuclear movement. Depleting nesprin-2G strongly interfered with directed cell migration and reduced the efficiency of myoblast fusion into multinucleated myotubes. Our results show that nuclear movement contributes to centrosome orientation and polarity for efficient migration and fusion of myoblasts. Given that mutations in the genes encoding A-type lamins, nesprin-2 and SUN2 cause Emery-Dreifuss muscular dystrophy and related myopathies, our results have implications for understanding the mechanism of disease pathogenesis.
Collapse
Affiliation(s)
- Wakam Chang
- a Department of Pathology and Cell Biology ; College of Physicians and Surgeons; Columbia University ; New York , NY USA
| | | | | | | | | |
Collapse
|
12
|
Wahlberg AM, Alenström M, Udin S, Johansson T, Lundgren A, Romany Johansson B, Ekström C, Eriksson N, Andersson L, Eklund H, Robertsson L, Bjerhag G, Gustavsson AC, Israelsson M, Karlsson S, Westerlund M, Ek Y, Stenbäck B, Andersson B, Andersson E, Leppämäki K, Ramirez A, Wallin V, Lundberg A, Sahlin B, Mälberg H, Liljeroos M, Gustafsson C, Nyström K, Siklo S, Zelleroth E, Hjortevang F, Mohammed K, Hellblad A, Schön I, Carlsson K, Ole´rs M, Ågren PL, Sjögren I, Zedigh C, Eriksson K, Sundkvist K, Thorsell AK, Kuoljok AK, Liinanki L, Liljergren M, Turtola S, Nylander BM, Nordvall L, Nilsson M, Blomqvist A, Sjöberg H, Nylander J, Berglund L, Mossberg L, Svennberg L, Haugen E, Hellsten L, Johansson S, Johansson B, Larsson P, Kellerth S, Bergström M, Gustafsson C, Nährström C, Evenås E, Sundin H, Lönn H, Svensson J, Kihlgren M, Larsson P, Palosaari P, Johansson S, Cedermark magnusson M, Ravn-Fischer A, Wittfeldt A, Perers E, Hellberg N, Holmberg M, Andersson B, Jangsten B, Selimovic N, Enström A, Dellgren G, Scherstén H, Biveby-Nilsson A, Lundberg J, Omerovic E, Petursson P, Albertsson P, Ankarstrand C, Flinck A, Larsson T, Samuelsson M, Bergman P, Nyström L, Bågenholm M, Linnér A, Hornestam B, Sjöland H, Kirkhoff AM, Månsson H, Karlsson I, Olausson M, Berne C, Backe C, Tabandeh A, Karlsson AC, Hårdhammar P, Olsson SE, Persson H, Wagner O, Wagner H, Sandhall L, Wåhlander C, Rova K, Fischer L, Nilsson M, Stjernberg M, Gustavsson S, Hedberg C, Thollander J, Collberg K, Lauermann J, Puskar W, Larsson M, Johansson A, Brindstedt L, Olofsson M, Carlsson J, Månsson K, Jeppsson U, Söderlind I, Hultman M, Ronnelin S, Fredriksson C, Skogman G, Ågren I, Almroth I, Trege Nilsson S, Pettersson G, Åkesson IM, Carlfelter S, Medin J, Mokhtar K, Pripp CM, Malmsten L, Karlsson A, Lenberg A, Lettenström A, Jost-Widén A, Johnson G, Ahlmark H, Brevik H, Nordberg I, Österberg-Persson J, Smedberg J, Eklund M, Haaga U, Henriksson AM, Allared M, Olsson H, Nilsson T, Juhlin L, Eriksson K, Hedquist L, Lundin U, Jonsson C, Pedersen M, Marainen J, Bylund M, Alsterdal M, Sjöberg A, Wigenstorp E, Peterzen G, Skeppstedt K, Berlin A, Wikström H, Pihl K, Ferm L, Larsson P, Johansson V, Finnas G, Ahlm H, Ekelind A, Larsson E, Eriksson GB, Sass V, Johansson Å, Malmqvist L, Westin L, Sigurjonsdottir E, Skuladottir F, Ottesen M, Bjarnadottir OB, Myrdal G, Traustadottir E, Sigvaldadóttir F, Garðarsdóttir G, Valgeirsdottir G, Magnusdottir S, Bjornsdottir T, Gudnason T, Matthiasdottir S, Jonsson M, Pettersson U, Peterson M, Molander K, Larsson M, Samuelsson B, Svensson C, Augustsson E, BertilssonFröjd E, Alfredsson J, Freter W, Lilja L, Andersson G, Venetsanos D, Björkholm A, Tödt T, Berglund U, Nielsen NE, Johansson J, Svensson J, Larsson RM, Lundmark L, Brolin G, Westergren A, Duckert A, Steffan V, Götberg M, Erlinge D, Scherstén F, Olivecrona G, Harnek J, Bondesson P, Knutsson P, Stenlund E, Thorén P, Algotsson S, Durakovic E, Gustafsson L, Nilsson M, Nilson M, Bhiladvala P, Håkansson M, Svensson C, Olsson I, Kjellstenius A, Åslund J, Alledal L, Varblane N, Nilsson V, Thudén M, Jensen SB, Svensson E, Pettersson M, Lindgren S, Pehrsson A, Svensson E, Olsson M, Rudenäs A, Öhman E, Falk SÅ, Jaensson A, Thell L, Billqvist A, Efraimsson-Nilsson B, Allansson I, Jansson M, Ingström A, Lundqvist C, Nyström I, Bergman I, Ekman J, Carlson L, Person S, Lindberg I, Thuesen L, Lindberg E, Lundberg G, Hedberg K, Kotka IL, Fogelberg A, Johansson A, Ståhl L, Kallryd A, Ramén A, Löfmark H, Fessahaie S, Brandrup-Wognsen M, Salomonsson C, Ardin P, Balcker E, Högberg F, Högberg F, Hultin Ånnegård E, Nilsson M, Svensson M, Tornestedt M, Björkander I, Edström C, Eurenius L, Samnegård A, Persson J, Östlund Papadogeorgos N, Mir-Akbari H, Stengård G, Bacsovics Brolin E, Brehmer K, Osman F, Törnblom M, Sundkvist K, Kumhala C, Jonsson E, Yazar A, Siddiqui A, Rück A, Henareh L, Cederlund K, Lemberg E, Larsson E, Persson A, Andersson K, Svensson P, A - Moalim F, Lundgren A, Gustavsson-segerhag E, Nordvall A, Söderlund G, Jarnert C, Mellbin L, Ivert T, Linder R, Törnerud M, Edén B, Lockne K, Rennerskog S, Kosmack J, Erlandsson M, Lindroos P, Peltonen A, Creutziger C, Berglund E, Henriksson M, Ingeborn C, Collste O, Aasa M, Karlsson K, Andersson U, Kohlström Englund L, Henning M, Vinblad v Walter AG, Nilsson C, Schilken H, Johansson I, Wallgren I, Niemi K, Niva O, Dofs M, Johansson A, Haupt J, Näslund C, Drewsen H, Söderlund M, Berts B, Lindvall B, Wadell D, Jensen J, Hedh Å, Johnson K, Nikitin C, Eriksson EL, Westlund E, Karlsson I, Björkdahl P, Uher R, Nyman U, Yndigegn T, Broberg A, Lamreus L, Söderström A, Lång M, Olsson H, Hussien Al-Saadi M, Landén E, Holmgren M, Rivera San Martin T, Nyström K, Wahlin M, Angerås O, Nilsson J, Eriksson P, Sundberg A, Sandström I, Duvernoy O, Andreasson M, Ekström J, Essermark M, Wall H, Marklund E, Östlund C, Willehadson M, Björklund C, Dimberg A, Zemgulis V, Olsson A, Hagström S, Bergman C, Gunnarsson A, Huhta M, Svensson C, Hultman P, Varenhorst C, Kvidal P, Stener Bengtsson A, Wännman AL, Nilsson L, Andersson T, Josefsson M, Morén M, Hultman-Berg L, Almqwist AK, Cederblad M, Ekberg K, Kvarnvik G, Jönsson E, Hammerman A, Claesson P, Widerström G, Pettersson Olsson S, Hofvander Å, Lindholm M, Saidi S, Grimfjärd P, Kåregren A, Runesson M, Josefsson A, Henriksson-Fri L, Johansson M, Gustavsson S, Markljung M, Bergström O, Aronsson T, Karlsson E, Boström P, Hansson S, Andreasson I, Palmqvist L, Kähäri A, Lidén M, Oskarsson F, Östman I, Kronberg J, Johansson M, Thuresson M, Geijer H, Fröbert O, Kellerth T, Tillkvist M, Ajax K, Björklund F, Björklund A. Annual report SWEDEHEART 2012. SCAND CARDIOVASC J 2014. [DOI: 10.3109/14017431.2014.931554] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
13
|
Bourgeois B, Gilquin B, Tellier-Lebègue C, Östlund C, Wu W, Pérez J, El Hage P, Lallemand F, Worman HJ, Zinn-Justin S. Inhibition of TGF-β signaling at the nuclear envelope: characterization of interactions between MAN1, Smad2 and Smad3, and PPM1A. Sci Signal 2013; 6:ra49. [PMID: 23779087 DOI: 10.1126/scisignal.2003411] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Signaling by transforming growth factor-β (TGF-β) is critical for various developmental processes and culminates in the activation of the transcription factors Smad2 and Smad3. MAN1, an integral protein of the inner nuclear membrane, inhibits TGF-β signaling by binding to Smad2 and Smad3. Depletion of the gene LEMD3 encoding MAN1 leads to developmental anomalies in mice, and heterozygous loss-of-function mutations in LEMD3 in humans cause sclerosing bone dysplasia. We modeled the three-dimensional structure of the MAN1-Smad2 complex from nuclear magnetic resonance and small-angle x-ray scattering data. As predicted by this model, we found that MAN1 competed in vitro and in cells with the transcription factor FAST1 (forkhead activin signal transducer 1) for binding to Smad2. The model further predicted that MAN1 bound to activated Smad2-Smad4 or Smad3-Smad4 complexes, which was confirmed by in vitro experiments; however, in cells, MAN1 bound only to Smad2 and Smad3 and not to the Smad4-containing complexes. Overexpression of MAN1 led to dephosphorylation of Smad2 and Smad3, thus hindering their recognition by Smad4, and MAN1 bound directly in vitro to the phosphatase PPM1A, which catalyzes the dephosphorylation of Smad2/3. These results demonstrate a nuclear envelope-localized mechanism of inactivating TGF-β signaling in which MAN1 competes with transcription factors for binding to Smad2 and Smad3 and facilitates their dephosphorylation by PPM1A.
Collapse
Affiliation(s)
- Benjamin Bourgeois
- Laboratoire de Biologie Structurale et Radiobiologie, URA CNRS 2096, CEA Saclay, 91190 Gif-sur-Yvette, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|