1
|
Ghosh S, Isma J, Mazzeo L, Toniolo A, Simon C, Dotto GP. Nuclear lamin A/C phosphorylation by loss of Androgen Receptor is a global determinant of cancer-associated fibroblast activation. bioRxiv 2023:2023.06.28.546870. [PMID: 37425957 PMCID: PMC10327063 DOI: 10.1101/2023.06.28.546870] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
Alterations of nuclear structure and function, and associated impact on gene transcription, are a hallmark of cancer cells. Little is known of these alterations in Cancer-Associated Fibroblasts (CAFs), a key component of the tumor stroma. Here we show that loss of androgen receptor (AR), which triggers early steps of CAF activation in human dermal fibroblasts (HDFs), leads to nuclear membrane alterations and increased micronuclei formation, which are unlinked from induction of cellular senescence. Similar alterations occur in fully established CAFs, which are overcome by restored AR function. AR associates with nuclear lamin A/C and loss of AR results in a substantially increased lamin A/C nucleoplasmic redistribution. Mechanistically, AR functions as a bridge between lamin A/C with the protein phosphatase PPP1. In parallel with a decreased lamin-PPP1 association, AR loss results in a marked increase of lamin A/C phosphorylation at Ser 301, which is also a feature of CAFs. Phosphorylated lamin A/C at Ser 301 binds to the transcription promoter regulatory region of several CAF effector genes, which are upregulated due to the loss of AR. More directly, expression of a lamin A/C Ser301 phosphomimetic mutant alone is sufficient to convert normal fibroblasts into tumor-promoting CAFs of the myofibroblast subtype, without an impact on senescence. These findings highlight the pivotal role of the AR-lamin A/C-PPP1 axis and lamin A/C phosphorylation at Ser 301 in driving CAF activation.
Collapse
Affiliation(s)
- Soumitra Ghosh
- Personalised Cancer Prevention Unit, ORL service, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
- Department of Immunobiology, University of Lausanne, Epalinges, Switzerland
| | - Jovan Isma
- Department of Immunobiology, University of Lausanne, Epalinges, Switzerland
| | - Luigi Mazzeo
- Department of Immunobiology, University of Lausanne, Epalinges, Switzerland
| | - Annagiada Toniolo
- Department of Immunobiology, University of Lausanne, Epalinges, Switzerland
| | - Christian Simon
- Personalised Cancer Prevention Unit, ORL service, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
- International Cancer Prevention Institute, Epalinges, Switzerland
| | - G. Paolo Dotto
- Personalised Cancer Prevention Unit, ORL service, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland
- Department of Immunobiology, University of Lausanne, Epalinges, Switzerland
- Cutaneous Biology Research Center, Department of Dermatology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA
- International Cancer Prevention Institute, Epalinges, Switzerland
| |
Collapse
|
2
|
Batha L, Aziz MA, Zhra M, Holail J, Al-Qahtani WS, Fakhoury R, Aljada A. Differential Gene Expression Signatures and Cellular Signaling Pathways induced by Lamin A/C Transcript Variants in MCF7 Cell Line. FRONT BIOSCI-LANDMRK 2023; 28:113. [PMID: 37395027 DOI: 10.31083/j.fbl2806113] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 02/03/2023] [Accepted: 05/04/2023] [Indexed: 07/04/2023]
Abstract
BACKGROUND Lamins are the major component of nuclear lamina. Alternative splicing of the 12 exons comprising lamin A/C gene creates five known transcript variants, lamin A, lamin C, lamin AΔ10, lamin AΔ50, and lamin C2. The main objective for this study was to examine the association of critical pathways, networks, molecular and cellular functions regulated by each Lamin A/C transcript variants. METHODS Ion AmpliSeq Transcriptome Human Gene Expression analysis was performed on MCF7 cells stably transfected with lamin A/C transcript variants. RESULTS Lamin A or lamin AΔ50 upregulation was associated with activation of cell death and inactivation of carcinogenesis while both lamin C or lamin AΔ10 upregulation activated carcinogenesis and cell death. CONCLUSIONS Data suggest anti-apoptotic and anti-senescence effects of lamin C and lamin AΔ10 as several functions, including apoptosis and necrosis functions are inactivated following lamin C or lamin AΔ10 upregulation. However, lamin AΔ10 upregulation is associated with a more carcinogenic and aggressive tumor phenotype. Lamin A or lamin AΔ50 upregulation is associated with a predicted activation of increased cell death and inactivation of carcinogenesis. Thus, different signaling pathways, networks, molecular and cellular functions are activated/inactivated by lamin A/C transcript variants resulting in a large number of laminopathies.
Collapse
Affiliation(s)
- Lin Batha
- Department of Biochemistry and Molecular Medicine, College of Medicine, Alfaisal University, 11533 Riyadh, Saudi Arabia
| | - Mohammad Azhar Aziz
- Interdisciplinary Nanotechnology Centre, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh, UP 202002, India
| | - Mahmoud Zhra
- Department of Biochemistry and Molecular Medicine, College of Medicine, Alfaisal University, 11533 Riyadh, Saudi Arabia
| | - Jasmine Holail
- Department of Biochemistry and Molecular Medicine, College of Medicine, Alfaisal University, 11533 Riyadh, Saudi Arabia
| | - Wedad S Al-Qahtani
- Department of Forensic Sciences, College of Criminal Justice, Naif Arab University for Security Sciences, 11452 Riyadh, Saudi Arabia
| | - Rajaa Fakhoury
- Department of Biochemistry and Molecular Medicine, College of Medicine, Alfaisal University, 11533 Riyadh, Saudi Arabia
| | - Ahmad Aljada
- Department of Biochemistry and Molecular Medicine, College of Medicine, Alfaisal University, 11533 Riyadh, Saudi Arabia
| |
Collapse
|
3
|
Manda NK, Golla U, Sesham K, Desai P, Joshi S, Patel S, Nalla S, Kondam S, Singh L, Dewansh D, Manda H, Rokana N. Tuning between Nuclear Organization and Functionality in Health and Disease. Cells 2023; 12. [PMID: 36899842 DOI: 10.3390/cells12050706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 02/08/2023] [Accepted: 02/20/2023] [Indexed: 02/25/2023] Open
Abstract
The organization of eukaryotic genome in the nucleus, a double-membraned organelle separated from the cytoplasm, is highly complex and dynamic. The functional architecture of the nucleus is confined by the layers of internal and cytoplasmic elements, including chromatin organization, nuclear envelope associated proteome and transport, nuclear-cytoskeletal contacts, and the mechano-regulatory signaling cascades. The size and morphology of the nucleus could impose a significant impact on nuclear mechanics, chromatin organization, gene expression, cell functionality and disease development. The maintenance of nuclear organization during genetic or physical perturbation is crucial for the viability and lifespan of the cell. Abnormal nuclear envelope morphologies, such as invagination and blebbing, have functional implications in several human disorders, including cancer, accelerated aging, thyroid disorders, and different types of neuro-muscular diseases. Despite the evident interplay between nuclear structure and nuclear function, our knowledge about the underlying molecular mechanisms for regulation of nuclear morphology and cell functionality during health and illness is rather poor. This review highlights the essential nuclear, cellular, and extracellular components that govern the organization of nuclei and functional consequences associated with nuclear morphometric aberrations. Finally, we discuss the recent developments with diagnostic and therapeutic implications targeting nuclear morphology in health and disease.
Collapse
|
4
|
Vahabikashi A, Sivagurunathan S, Nicdao FAS, Han YL, Park CY, Kittisopikul M, Wong X, Tran JR, Gundersen GG, Reddy KL, Luxton GWG, Guo M, Fredberg JJ, Zheng Y, Adam SA, Goldman RD. Nuclear lamin isoforms differentially contribute to LINC complex-dependent nucleocytoskeletal coupling and whole-cell mechanics. Proc Natl Acad Sci U S A 2022; 119:e2121816119. [PMID: 35439057 DOI: 10.1073/pnas.2121816119] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Interactions between the cell nucleus and cytoskeleton regulate cell mechanics and are facilitated by the interplay between the nuclear lamina and linker of nucleoskeleton and cytoskeleton (LINC) complexes. To date, the specific contribution of the four lamin isoforms to nucleocytoskeletal connectivity and whole-cell mechanics remains unknown. We discover that A- and B-type lamins distinctively interact with LINC complexes that bind F-actin and vimentin filaments to differentially modulate cortical stiffness, cytoplasmic stiffness, and contractility of mouse embryonic fibroblasts (MEFs). We propose and experimentally verify an integrated lamin–LINC complex–cytoskeleton model that explains cellular mechanical phenotypes in lamin-deficient MEFs. Our findings uncover potential mechanisms for cellular defects in human laminopathies and many cancers associated with mutations or modifications in lamin isoforms. The ability of a cell to regulate its mechanical properties is central to its function. Emerging evidence suggests that interactions between the cell nucleus and cytoskeleton influence cell mechanics through poorly understood mechanisms. Here we conduct quantitative confocal imaging to show that the loss of A-type lamins tends to increase nuclear and cellular volume while the loss of B-type lamins behaves in the opposite manner. We use fluorescence recovery after photobleaching, atomic force microscopy, optical tweezer microrheology, and traction force microscopy to demonstrate that A-type lamins engage with both F-actin and vimentin intermediate filaments (VIFs) through the linker of nucleoskeleton and cytoskeleton (LINC) complexes to modulate cortical and cytoplasmic stiffness as well as cellular contractility in mouse embryonic fibroblasts (MEFs). In contrast, we show that B-type lamins predominantly interact with VIFs through LINC complexes to regulate cytoplasmic stiffness and contractility. We then propose a physical model mediated by the lamin–LINC complex that explains these distinct mechanical phenotypes (mechanophenotypes). To verify this model, we use dominant negative constructs and RNA interference to disrupt the LINC complexes that facilitate the interaction of the nucleus with the F-actin and VIF cytoskeletons and show that the loss of these elements results in mechanophenotypes like those observed in MEFs that lack A- or B-type lamin isoforms. Finally, we demonstrate that the loss of each lamin isoform softens the cell nucleus and enhances constricted cell migration but in turn increases migration-induced DNA damage. Together, our findings uncover distinctive roles for each of the four major lamin isoforms in maintaining nucleocytoskeletal interactions and cellular mechanics.
Collapse
|
5
|
Reilly A, Philip Creamer J, Stewart S, Stolla MC, Wang Y, Du J, Wellington R, Busch S, Estey EH, Becker PS, Fang M, Keel SB, Abkowitz JL, Soma LA, Ma J, Duan Z, Doulatov S. Lamin B1 deletion in myeloid neoplasms causes nuclear anomaly and altered hematopoietic stem cell function. Cell Stem Cell 2022; 29:577-592.e8. [PMID: 35278369 PMCID: PMC9018112 DOI: 10.1016/j.stem.2022.02.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [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: 05/18/2021] [Revised: 01/05/2022] [Accepted: 02/15/2022] [Indexed: 11/19/2022]
Abstract
Abnormal nuclear morphology is a hallmark of malignant cells widely used in cancer diagnosis. Pelger-Huët anomaly (PHA) is a common abnormality of neutrophil nuclear morphology of unknown molecular etiology in myeloid neoplasms (MNs). We show that loss of nuclear lamin B1 (LMNB1) encoded on chromosome 5q, which is frequently deleted in MNs, induces defects in nuclear morphology and human hematopoietic stem cell (HSC) function associated with malignancy. LMNB1 deficiency alters genome organization inducing in vitro and in vivo expansion of HSCs, myeloid-biased differentiation with impaired lymphoid commitment, and genome instability due to defective DNA damage repair. Nuclear dysmorphology of neutrophils in patients with MNs is associated with 5q deletions spanning the LMNB1 locus, and lamin B1 loss is both necessary and sufficient to cause PHA in normal and 5q-deleted neutrophils. LMNB1 loss thus causes acquired PHA and links abnormal nuclear morphology with HSCs and progenitor cell fate determination via genome organization.
Collapse
Affiliation(s)
- Andreea Reilly
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - J Philip Creamer
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Sintra Stewart
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Massiel C Stolla
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Yuchuan Wang
- Computational Biology Department, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Jing Du
- Division of Laboratory Medicine, University of Washington, Seattle, WA 98195, USA
| | - Rachel Wellington
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA; Molecular and Cellular Biology Program, University of Washington, Seattle, WA 98195, USA
| | - Stephanie Busch
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Elihu H Estey
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA; Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Pamela S Becker
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA; Division of Hematology/Oncology, Chao Family Comprehensive Cancer Center, University of California Irvine, Irvine, CA 92617, USA; Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Min Fang
- Department of Clinical Transplant Research, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Siobán B Keel
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Janis L Abkowitz
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA; Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA
| | - Lorinda A Soma
- Division of Laboratory Medicine, University of Washington, Seattle, WA 98195, USA
| | - Jian Ma
- Computational Biology Department, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Zhijun Duan
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98195, USA
| | - Sergei Doulatov
- Division of Hematology, Department of Medicine, University of Washington, Seattle, WA 98195, USA; Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98195, USA.
| |
Collapse
|
6
|
Stiekema M, Ramaekers FCS, Kapsokalyvas D, van Zandvoort MAMJ, Veltrop RJA, Broers JLV. Super-Resolution Imaging of the A- and B-Type Lamin Networks: A Comparative Study of Different Fluorescence Labeling Procedures. Int J Mol Sci 2021; 22:ijms221910194. [PMID: 34638534 PMCID: PMC8508656 DOI: 10.3390/ijms221910194] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 09/13/2021] [Accepted: 09/14/2021] [Indexed: 12/31/2022] Open
Abstract
A- and B-type lamins are type V intermediate filament proteins. Mutations in the genes encoding these lamins cause rare diseases, collectively called laminopathies. A fraction of the cells obtained from laminopathy patients show aberrations in the localization of each lamin subtype, which may represent only the minority of the lamina disorganization. To get a better insight into more delicate and more abundant lamina abnormalities, the lamin network can be studied using super-resolution microscopy. We compared confocal scanning laser microscopy and stimulated emission depletion (STED) microscopy in combination with different fluorescence labeling approaches for the study of the lamin network. We demonstrate the suitability of an immunofluorescence staining approach when using STED microscopy, by determining the lamin layer thickness and the degree of lamin A and B1 colocalization as detected in fixed fibroblasts (co-)stained with lamin antibodies or (co-)transfected with EGFP/YFP lamin constructs. This revealed that immunofluorescence staining of cells does not lead to consequent changes in the detected lamin layer thickness, nor does it influence the degree of colocalization of lamin A and B1, when compared to the transfection approach. Studying laminopathy patient dermal fibroblasts (LMNA c.1130G>T (p.(Arg377Leu)) variant) confirmed the suitability of immunofluorescence protocols in STED microscopy, which circumvents the need for less convenient transfection steps. Furthermore, we found a significant decrease in lamin A/C and B1 colocalization in these patient fibroblasts, compared to normal human dermal fibroblasts. We conclude that super-resolution light microscopy combined with immunofluorescence protocols provides a potential tool to detect structural lamina differences between normal and laminopathy patient fibroblasts.
Collapse
Affiliation(s)
- Merel Stiekema
- Department of Genetics and Cell Biology, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands; (M.S.); (F.C.S.R.); (D.K.); (M.A.M.J.v.Z.)
- GROW-School for Oncology and Developmental Biology, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands
| | - Frans C. S. Ramaekers
- Department of Genetics and Cell Biology, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands; (M.S.); (F.C.S.R.); (D.K.); (M.A.M.J.v.Z.)
- GROW-School for Oncology and Developmental Biology, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands
| | - Dimitrios Kapsokalyvas
- Department of Genetics and Cell Biology, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands; (M.S.); (F.C.S.R.); (D.K.); (M.A.M.J.v.Z.)
- Interdisciplinary Center for Clinical Research, IZKF, RWTH Aachen University, 52074 Aachen, Germany
| | - Marc A. M. J. van Zandvoort
- Department of Genetics and Cell Biology, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands; (M.S.); (F.C.S.R.); (D.K.); (M.A.M.J.v.Z.)
- GROW-School for Oncology and Developmental Biology, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands
- CARIM-School for Cardiovascular Diseases, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands
- Institute for Molecular Cardiovascular Research IMCAR, RWTH Aachen University, 52074 Aachen, Germany
| | - Rogier J. A. Veltrop
- Institute for Molecular Cardiovascular Research IMCAR, RWTH Aachen University, 52074 Aachen, Germany
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University, 6200 MD Maastricht, The Netherlands;
| | - Jos L. V. Broers
- Department of Genetics and Cell Biology, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands; (M.S.); (F.C.S.R.); (D.K.); (M.A.M.J.v.Z.)
- GROW-School for Oncology and Developmental Biology, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands
- CARIM-School for Cardiovascular Diseases, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands
- Correspondence: ; Tel.: +31-433881366
| |
Collapse
|
7
|
Abstract
The heart continually senses and responds to mechanical stimuli that balance cardiac structure and activity. Tensile forces, compressive forces, and shear stress are sensed by the different cardiac cell types and converted into signals instructing proper heart morphogenesis, postnatal growth, and function. Defects in mechanotransduction, the ability of cells to convert mechanical stimuli into biochemical signals, are implicated in cardiovascular disease development and progression. In this review, we summarize the current knowledge on how mechanical forces are transduced to chromatin through the tensed actomyosin cytoskeleton, the linker of nucleoskeleton and cytoskeleton (LINC) complex and the nuclear lamina. We also discuss the functional significance of the LINC complex in cardiovascular disease.
Collapse
Affiliation(s)
- Olga Lityagina
- Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Gergana Dobreva
- Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.,German Centre for Cardiovascular Research (DZHK), Partner Site Heidelberg/Mannheim, Mannheim, Germany
| |
Collapse
|
8
|
Chen NY, Kim PH, Tu Y, Yang Y, Heizer PJ, Young SG, Fong LG. Increased expression of LAP2β eliminates nuclear membrane ruptures in nuclear lamin-deficient neurons and fibroblasts. Proc Natl Acad Sci U S A 2021; 118:e2107770118. [PMID: 34161290 PMCID: PMC8237679 DOI: 10.1073/pnas.2107770118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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] [Indexed: 11/18/2022] Open
Abstract
Defects or deficiencies in nuclear lamins cause pathology in many cell types, and recent studies have implicated nuclear membrane (NM) ruptures as a cause of cell toxicity. We previously observed NM ruptures and progressive cell death in the developing brain of lamin B1-deficient mouse embryos. We also observed frequent NM ruptures and DNA damage in nuclear lamin-deficient fibroblasts. Factors modulating susceptibility to NM ruptures remain unclear, but we noted low levels of LAP2β, a chromatin-binding inner NM protein, in fibroblasts with NM ruptures. Here, we explored the apparent link between LAP2β and NM ruptures in nuclear lamin-deficient neurons and fibroblasts, and we tested whether manipulating LAP2β expression levels would alter NM rupture frequency. In cortical plate neurons of lamin B1-deficient embryos, we observed a strong correlation between low LAP2β levels and NM ruptures. We also found low LAP2β levels and frequent NM ruptures in neurons of cultured Lmnb1-/- neurospheres. Reducing LAP2β expression in Lmnb1-/- neurons with an siRNA markedly increased the NM rupture frequency (without affecting NM rupture duration), whereas increased LAP2β expression eliminated NM ruptures and reduced DNA damage. Consistent findings were observed in nuclear lamin-deficient fibroblasts. Reduced LAP2β expression increased NM ruptures, whereas increased LAP2β expression virtually abolished NM ruptures. Increased LAP2β expression nearly abolished NM ruptures in cells subjected to mechanical stress (an intervention that increases NM ruptures). Our studies showed that increasing LAP2β expression bolsters NM integrity in nuclear lamin-deficient cells and markedly reduces NM rupture frequency.
Collapse
Affiliation(s)
- Natalie Y Chen
- Department of Medicine, University of California, Los Angeles, CA 90095
| | - Paul H Kim
- Department of Medicine, University of California, Los Angeles, CA 90095
| | - Yiping Tu
- Department of Medicine, University of California, Los Angeles, CA 90095
| | - Ye Yang
- Department of Medicine, University of California, Los Angeles, CA 90095
| | - Patrick J Heizer
- Department of Medicine, University of California, Los Angeles, CA 90095
| | - Stephen G Young
- Department of Medicine, University of California, Los Angeles, CA 90095;
- Department of Human Genetics, University of California, Los Angeles, CA 90095
- Molecular Biology Institute, University of California, Los Angeles, CA 90095
| | - Loren G Fong
- Department of Medicine, University of California, Los Angeles, CA 90095;
| |
Collapse
|
9
|
Naetar N, Georgiou K, Knapp C, Bronshtein I, Zier E, Fichtinger P, Dechat T, Garini Y, Foisner R. LAP2alpha maintains a mobile and low assembly state of A-type lamins in the nuclear interior. eLife 2021; 10:63476. [PMID: 33605210 PMCID: PMC7939549 DOI: 10.7554/elife.63476] [Citation(s) in RCA: 7] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 02/18/2021] [Indexed: 01/08/2023] Open
Abstract
Lamins form stable filaments at the nuclear periphery in metazoans. Unlike B-type lamins, lamins A and C localize also in the nuclear interior, where they interact with lamin-associated polypeptide 2 alpha (LAP2α). Using antibody labeling, we previously observed a depletion of nucleoplasmic A-type lamins in mouse cells lacking LAP2α. Here, we show that loss of LAP2α actually causes formation of larger, biochemically stable lamin A/C structures in the nuclear interior that are inaccessible to lamin A/C antibodies. While nucleoplasmic lamin A forms from newly expressed pre-lamin A during processing and from soluble mitotic lamins in a LAP2α-independent manner, binding of LAP2α to lamin A/C during interphase inhibits formation of higher order structures, keeping nucleoplasmic lamin A/C in a mobile state independent of lamin A/C S22 phosphorylation. We propose that LAP2α is essential to maintain a mobile lamin A/C pool in the nuclear interior, which is required for proper nuclear functions.
Collapse
Affiliation(s)
- Nana Naetar
- Max Perutz Labs, Center for Medical Biochemistry, Medical University of Vienna, Vienna Biocenter Campus (VBC), Vienna, Austria
| | - Konstantina Georgiou
- Max Perutz Labs, Center for Medical Biochemistry, Medical University of Vienna, Vienna Biocenter Campus (VBC), Vienna, Austria
| | - Christian Knapp
- Max Perutz Labs, Center for Medical Biochemistry, Medical University of Vienna, Vienna Biocenter Campus (VBC), Vienna, Austria
| | - Irena Bronshtein
- Physics Department and Nanotechnology Institute, Bar Ilan University, Ramat Gan, Israel
| | - Elisabeth Zier
- Max Perutz Labs, Center for Medical Biochemistry, Medical University of Vienna, Vienna Biocenter Campus (VBC), Vienna, Austria
| | - Petra Fichtinger
- Max Perutz Labs, Center for Medical Biochemistry, Medical University of Vienna, Vienna Biocenter Campus (VBC), Vienna, Austria
| | - Thomas Dechat
- Max Perutz Labs, Center for Medical Biochemistry, Medical University of Vienna, Vienna Biocenter Campus (VBC), Vienna, Austria
| | - Yuval Garini
- Physics Department and Nanotechnology Institute, Bar Ilan University, Ramat Gan, Israel
| | - Roland Foisner
- Max Perutz Labs, Center for Medical Biochemistry, Medical University of Vienna, Vienna Biocenter Campus (VBC), Vienna, Austria
| |
Collapse
|
10
|
Chen NY, Kim PH, Fong LG, Young SG. Nuclear membrane ruptures, cell death, and tissue damage in the setting of nuclear lamin deficiencies. Nucleus 2020; 11:237-249. [PMID: 32910721 PMCID: PMC7529418 DOI: 10.1080/19491034.2020.1815410] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/19/2020] [Accepted: 08/21/2020] [Indexed: 12/26/2022] Open
Abstract
The nuclear membranes function as a barrier to separate the cell nucleus from the cytoplasm, but this barrier can be compromised by nuclear membrane ruptures, leading to intermixing of nuclear and cytoplasmic contents. Spontaneous nuclear membrane ruptures (i.e., ruptures occurring in the absence of mechanical stress) have been observed in cultured cells, but they are more frequent in the setting of defects or deficiencies in nuclear lamins and when cells are subjected to mechanical stress. Nuclear membrane ruptures in cultured cells have been linked to DNA damage, but the relevance of ruptures to developmental or physiologic processes in vivo has received little attention. Recently, we addressed that issue by examining neuronal migration in the cerebral cortex, a developmental process that subjects the cell nucleus to mechanical stress. In the setting of lamin B1 deficiency, we observed frequent nuclear membrane ruptures in migrating neurons in the developing cerebral cortex and showed that those ruptures are likely the cause of observed DNA damage, neuronal cell death, and profound neuropathology. In this review, we discuss the physiologic relevance of nuclear membrane ruptures, with a focus on migrating neurons in cell culture and in the cerebral cortex of genetically modified mice.
Collapse
Affiliation(s)
- Natalie Y. Chen
- Department of Medicine, University of California, Los Angeles, CA, USA
| | - Paul H. Kim
- Department of Medicine, University of California, Los Angeles, CA, USA
| | - Loren G. Fong
- Department of Medicine, University of California, Los Angeles, CA, USA
| | - Stephen G. Young
- Department of Medicine, University of California, Los Angeles, CA, USA
- Department of Human Genetics, University of California, Los Angeles, CA, USA
- Department of Molecular Biology Institute, University of California, Los Angeles, CA, USA
| |
Collapse
|
11
|
Stalmans G, Lilina AV, Vermeire PJ, Fiala J, Novák P, Strelkov SV. Addressing the Molecular Mechanism of Longitudinal Lamin Assembly Using Chimeric Fusions. Cells 2020; 9:E1633. [PMID: 32645958 DOI: 10.3390/cells9071633] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 07/01/2020] [Accepted: 07/02/2020] [Indexed: 12/28/2022] Open
Abstract
The molecular architecture and assembly mechanism of intermediate filaments have been enigmatic for decades. Among those, lamin filaments are of particular interest due to their universal role in cell nucleus and numerous disease-related mutations. Filament assembly is driven by specific interactions of the elementary dimers, which consist of the central coiled-coil rod domain flanked by non-helical head and tail domains. We aimed to investigate the longitudinal 'head-to-tail' interaction of lamin dimers (the so-called ACN interaction), which is crucial for filament assembly. To this end, we prepared a series of recombinant fragments of human lamin A centred around the N- and C-termini of the rod. The fragments were stabilized by fusions to heterologous capping motifs which provide for a correct formation of parallel, in-register coiled-coil dimers. As a result, we established crystal structures of two N-terminal fragments one of which highlights the propensity of the coiled-coil to open up, and one C-terminal rod fragment. Additional studies highlighted the capacity of such N- and C-terminal fragments to form specific complexes in solution, which were further characterized using chemical cross-linking. These data yielded a molecular model of the ACN complex which features a 6.5 nm overlap of the rod ends.
Collapse
|
12
|
Abstract
Nuclear lamins (NLs) are essential components of the animal cell nucleus involved in the regulation of a plethora of molecular and cellular processes. These include the nuclear envelope assembly and stability, mechanotransduction and chromatin organization, transcription, DNA replication, damage repair, and genomic integrity maintenance. Mutations in NLs can lead to the development of a wide range of distinct disease phenotypes, laminopathies, consisting of cardiac, neuromuscular, metabolic and premature aging syndromes. In addition, alterations in the expression of nuclear lamins were associated with different types of neoplastic diseases. Despite the importance and critical roles that NLs play in the diverse cellular activities, we only recently started to uncover the complexity of regulatory mechanisms governing their expression, localization and functions. This integrative review summarizes and discusses the recent findings on the emerging roles of ubiquitin and ubiquitin-like modifiers (ULMs) in the regulation of NLs, highlighting the intriguing molecular associations and cross-talks occurring between NLs and these regulatory molecules under physiological conditions and in the disease states.
Collapse
Affiliation(s)
- Michael Blank
- Laboratory of Molecular and Cellular Cancer Biology, Azrieli Faculty of Medicine, Bar-Ilan University, Safed 1311502, Israel
| |
Collapse
|
13
|
Abstract
Immunosuppressive drugs such as cyclosporin A (CsA) can elicit hepatotoxicity by affecting gene expression. Here, we address the link between CsA and large-scale chromatin organization in HepG2 hepatocarcinoma cells. We show the existence of lamina-associated domains (LADs) interacting with lamin A, lamin B, or both. These ‘A-B’, ‘A-only’ and ‘B-only’ LADs display distinct fates after CsA treatment: A-B LADs remain constitutive or lose A, A-only LADs mainly lose A or switch to B, and B-only LADs remain B-only or acquire A. LAD rearrangement is overall uncoupled from changes in gene expression. Three-dimensional (3D) genome modeling predicts changes in radial positioning of LADs as LADs switch identities, which are corroborated by fluorescence in situ hybridization. Our results reveal interplay between A- and B-type lamins on radial locus positioning, suggesting complementary contributions to large-scale genome architecture. The data also unveil a hitherto unsuspected impact of cytotoxic drugs on genome conformation.Abbreviations: ChIP-seq: chromatin immunoprecipitation sequencing; CsA: cyclosporin A; FISH; fluorescence in situ hybridization; ICMT: isoprenylcysteine methyltransferase; LAD: lamina-associated domain; TAD: topologically-associated domain
Collapse
Affiliation(s)
- Frida Forsberg
- a Department of Molecular Medicine, Institute of Basic Medical Sciences, Faculty of Medicine , University of Oslo , Oslo , Norway
| | - Annaël Brunet
- a Department of Molecular Medicine, Institute of Basic Medical Sciences, Faculty of Medicine , University of Oslo , Oslo , Norway
| | - Tharvesh M Liyakat Ali
- a Department of Molecular Medicine, Institute of Basic Medical Sciences, Faculty of Medicine , University of Oslo , Oslo , Norway
| | - Philippe Collas
- a Department of Molecular Medicine, Institute of Basic Medical Sciences, Faculty of Medicine , University of Oslo , Oslo , Norway.,b Norwegian Center for Stem Cell Research, Department of Immunology and Transfusion Medicine , Oslo University Hospital , Oslo , Norway
| |
Collapse
|
14
|
Wintner O, Hirsch‐Attas N, Schlossberg M, Brofman F, Friedman R, Kupervaser M, Kitsberg D, Buxboim A. A Unified Linear Viscoelastic Model of the Cell Nucleus Defines the Mechanical Contributions of Lamins and Chromatin. Adv Sci (Weinh) 2020; 7:1901222. [PMID: 32328409 PMCID: PMC7175345 DOI: 10.1002/advs.201901222] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 01/22/2020] [Indexed: 05/26/2023]
Abstract
The cell nucleus is constantly subjected to externally applied forces. During metazoan evolution, the nucleus has been optimized to allow physical deformability while protecting the genome under load. Aberrant nucleus mechanics can alter cell migration across narrow spaces in cancer metastasis and immune response and disrupt nucleus mechanosensitivity. Uncovering the mechanical roles of lamins and chromatin is imperative for understanding the implications of physiological forces on cells and nuclei. Lamin-knockout and -rescue fibroblasts and probed nucleus response to physiologically relevant stresses are generated. A minimal viscoelastic model is presented that captures dynamic resistance across different cell types, lamin composition, phosphorylation states, and chromatin condensation. The model is conserved at low and high loading and is validated by micropipette aspiration and nanoindentation rheology. A time scale emerges that separates between dominantly elastic and dominantly viscous regimes. While lamin-A and lamin-B1 contribute to nucleus stiffness, viscosity is specified mostly by lamin-A. Elastic and viscous association of lamin-B1 and lamin-A is supported by transcriptional and proteomic profiling analyses. Chromatin decondensation quantified by electron microscopy softens the nucleus unless lamin-A is expressed. A mechanical framework is provided for assessing nucleus response to applied forces in health and disease.
Collapse
Affiliation(s)
- Oren Wintner
- Department of Cell and Developmental BiologyThe Alexander Silberman Institute of Life SciencesThe Hebrew University of JerusalemJerusalem9190401Israel
- Alexander Grass Center for BioengineeringThe Rachel and Selim Benin School of Computer Science and EngineeringJerusalem9190416Israel
| | - Nivi Hirsch‐Attas
- Department of Cell and Developmental BiologyThe Alexander Silberman Institute of Life SciencesThe Hebrew University of JerusalemJerusalem9190401Israel
| | - Miriam Schlossberg
- Department of Cell and Developmental BiologyThe Alexander Silberman Institute of Life SciencesThe Hebrew University of JerusalemJerusalem9190401Israel
| | - Fani Brofman
- Department of Cell and Developmental BiologyThe Alexander Silberman Institute of Life SciencesThe Hebrew University of JerusalemJerusalem9190401Israel
| | - Roy Friedman
- Alexander Grass Center for BioengineeringThe Rachel and Selim Benin School of Computer Science and EngineeringJerusalem9190416Israel
| | - Meital Kupervaser
- The de Botton Institute for Protein ProfilingThe Nancy and Stephen Grand Israel National Center for Personalized MedicineWeizmann Institute of ScienceRehovot7610001Israel
| | - Danny Kitsberg
- Department of Cell and Developmental BiologyThe Alexander Silberman Institute of Life SciencesThe Hebrew University of JerusalemJerusalem9190401Israel
| | - Amnon Buxboim
- Department of Cell and Developmental BiologyThe Alexander Silberman Institute of Life SciencesThe Hebrew University of JerusalemJerusalem9190401Israel
- Alexander Grass Center for BioengineeringThe Rachel and Selim Benin School of Computer Science and EngineeringJerusalem9190416Israel
| |
Collapse
|
15
|
Cavaliere V, Lattanzi G, Andrenacci D. Silencing of Euchromatic Transposable Elements as a Consequence of Nuclear Lamina Dysfunction. Cells 2020; 9:cells9030625. [PMID: 32151001 PMCID: PMC7140440 DOI: 10.3390/cells9030625] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 02/28/2020] [Accepted: 03/02/2020] [Indexed: 02/07/2023] Open
Abstract
Transposable elements (TEs) are mobile genomic sequences that are normally repressed to avoid proliferation and genome instability. Gene silencing mechanisms repress TEs by RNA degradation or heterochromatin formation. Heterochromatin maintenance is therefore important to keep TEs silent. Loss of heterochromatic domains has been linked to lamin mutations, which have also been associated with derepression of TEs. In fact, lamins are structural components of the nuclear lamina (NL), which is considered a pivotal structure in the maintenance of heterochromatin domains at the nuclear periphery in a silent state. Here, we show that a lethal phenotype associated with Lamin loss-of-function mutations is influenced by Drosophila gypsy retrotransposons located in euchromatic regions, suggesting that NL dysfunction has also effects on active TEs located in euchromatic loci. In fact, expression analysis of different long terminal repeat (LTR) retrotransposons and of one non-LTR retrotransposon located near active genes shows that Lamin inactivation determines the silencing of euchromatic TEs. Furthermore, we show that the silencing effect on euchromatic TEs spreads to the neighboring genomic regions, with a repressive effect on nearby genes. We propose that NL dysfunction may have opposed regulatory effects on TEs that depend on their localization in active or repressed regions of the genome.
Collapse
Affiliation(s)
- Valeria Cavaliere
- Dipartimento di Farmacia e Biotecnologie, Alma Mater Studiorum Università di Bologna, 40126 Bologna, Italy;
| | - Giovanna Lattanzi
- CNR Institute of Molecular Genetics “Luigi-Luca Cavalli-Sforza”, Unit of Bologna, 40136 Bologna, Italy;
- IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy
| | - Davide Andrenacci
- CNR Institute of Molecular Genetics “Luigi-Luca Cavalli-Sforza”, Unit of Bologna, 40136 Bologna, Italy;
- IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy
- Correspondence:
| |
Collapse
|
16
|
Heizer PJ, Yang Y, Tu Y, Kim PH, Chen NY, Hu Y, Yoshinaga Y, de Jong PJ, Vergnes L, Morales JE, Li RL, Jackson N, Reue K, Young SG, Fong LG. Deficiency in ZMPSTE24 and resulting farnesyl-prelamin A accumulation only modestly affect mouse adipose tissue stores. J Lipid Res 2020; 61:413-421. [PMID: 31941672 DOI: 10.1194/jlr.ra119000593] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 12/24/2019] [Revised: 01/14/2020] [Indexed: 11/20/2022] Open
Abstract
Zinc metallopeptidase STE24 (ZMPSTE24) is essential for the conversion of farnesyl-prelamin A to mature lamin A, a key component of the nuclear lamina. In the absence of ZMPSTE24, farnesyl-prelamin A accumulates in the nucleus and exerts toxicity, causing a variety of disease phenotypes. By ∼4 months of age, both male and female Zmpste24 -/- mice manifest a near-complete loss of adipose tissue, but it has never been clear whether this phenotype is a direct consequence of farnesyl-prelamin A toxicity in adipocytes. To address this question, we generated a conditional knockout Zmpste24 allele and used it to create adipocyte-specific Zmpste24-knockout mice. To boost farnesyl-prelamin A levels, we bred in the "prelamin A-only" Lmna allele. Gene expression, immunoblotting, and immunohistochemistry experiments revealed that adipose tissue in these mice had decreased Zmpste24 expression along with strikingly increased accumulation of prelamin A. In male mice, Zmpste24 deficiency in adipocytes was accompanied by modest changes in adipose stores (an 11% decrease in body weight, a 23% decrease in body fat mass, and significantly smaller gonadal and inguinal white adipose depots). No changes in adipose stores were detected in female mice, likely because prelamin A expression in adipose tissue is lower in female mice. Zmpste24 deficiency in adipocytes did not alter the number of macrophages in adipose tissue, nor did it alter plasma levels of glucose, triglycerides, or fatty acids. We conclude that ZMPSTE24 deficiency in adipocytes, and the accompanying accumulation of farnesyl-prelamin A, reduces adipose tissue stores, but only modestly and only in male mice.
Collapse
Affiliation(s)
- Patrick J Heizer
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Ye Yang
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Yiping Tu
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Paul H Kim
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Natalie Y Chen
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Yan Hu
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Yuko Yoshinaga
- Children's Hospital Oakland Research Institute, Oakland, CA 94609
| | - Pieter J de Jong
- Children's Hospital Oakland Research Institute, Oakland, CA 94609
| | - Laurent Vergnes
- Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095
| | - Jazmin E Morales
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Robert L Li
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Nicholas Jackson
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| | - Karen Reue
- Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095
| | - Stephen G Young
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095 .,Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095
| | - Loren G Fong
- Departments of Medicine University of California, Los Angeles, Los Angeles, CA 90095
| |
Collapse
|
17
|
Chen NY, Yang Y, Weston TA, Belling JN, Heizer P, Tu Y, Kim P, Edillo L, Jonas SJ, Weiss PS, Fong LG, Young SG. An absence of lamin B1 in migrating neurons causes nuclear membrane ruptures and cell death. Proc Natl Acad Sci U S A 2019; 116:25870-25879. [PMID: 31796586 PMCID: PMC6926041 DOI: 10.1073/pnas.1917225116] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [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] [Indexed: 11/18/2022] Open
Abstract
Deficiencies in either lamin B1 or lamin B2 cause both defective migration of cortical neurons in the developing brain and reduced neuronal survival. The neuronal migration abnormality is explained by a weakened nuclear lamina that interferes with nucleokinesis, a nuclear translocation process required for neuronal migration. In contrast, the explanation for impaired neuronal survival is poorly understood. We hypothesized that the forces imparted on the nucleus during neuronal migration result in nuclear membrane (NM) ruptures, causing interspersion of nuclear and cytoplasmic contents-and ultimately cell death. To test this hypothesis, we bred Lmnb1-deficient mice that express a nuclear-localized fluorescent Cre reporter. Migrating neurons within the cortical plate of E18.5 Lmnb1-deficient embryos exhibited NM ruptures, evident by the escape of the nuclear-localized reporter into the cytoplasm and NM discontinuities by electron microscopy. The NM ruptures were accompanied by DNA damage and cell death. The NM ruptures were not observed in nonmigrating cells within the ventricular zone. NM ruptures, DNA damage, and cell death were also observed in cultured Lmnb1-/- and Lmnb2-/- neurons as they migrated away from neurospheres. To test whether mechanical forces on the cell nucleus are relevant to NM ruptures in migrating neurons, we examined cultured Lmnb1-/- neurons when exposed to external constrictive forces (migration into a field of tightly spaced silicon pillars). As the cells entered the field of pillars, there were frequent NM ruptures, accompanied by DNA damage and cell death.
Collapse
Affiliation(s)
- Natalie Y Chen
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
| | - Ye Yang
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
| | - Thomas A Weston
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
| | - Jason N Belling
- California NanoSystems Institute, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
- Department of Chemistry and Biochemistry, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
| | - Patrick Heizer
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
| | - Yiping Tu
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
| | - Paul Kim
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
| | - Lovelyn Edillo
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
| | - Steven J Jonas
- Department of Pediatrics, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
- Children's Discovery and Innovation Institute, University of California, Los Angeles, CA 90095
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, CA 90095
| | - Paul S Weiss
- California NanoSystems Institute, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
- Department of Chemistry and Biochemistry, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
- Department of Bioengineering, University of California, Los Angeles, CA 90095
- Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095
| | - Loren G Fong
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095;
| | - Stephen G Young
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095;
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
- Molecular Biology Institute, David Geffen School of Medicine, University of California, Los Angeles, CA 90095
| |
Collapse
|
18
|
Koaykul C, Kim MH, Kawahara Y, Yuge L, Kino-Oka M. Maintenance of Neurogenic Differentiation Potential in Passaged Bone Marrow-Derived Human Mesenchymal Stem Cells Under Simulated Microgravity Conditions. Stem Cells Dev 2019; 28:1552-1561. [PMID: 31588849 DOI: 10.1089/scd.2019.0146] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [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: 12/18/2022] Open
Abstract
Human mesenchymal stem cells (hMSCs) are considered to be able to adapt to environmental changes induced by gravity during cell expansion. In this study, we investigated neurogenic differentiation potential of passaged hMSCs under conventional gravity and simulated microgravity conditions. Immunostaining, quantitative real-time reverse transcription-polymerase chain reaction (qRT-PCR), and western blot analysis of neurogenic differentiation markers, neurofilament heavy (NF-H), and microtubule-associated protein 2 (MAP2) revealed that differentiated cells from the cells cultured under simulated microgravity conditions expressed higher neurogenic levels than those from conventional gravity conditions. The levels of NF-H and MAP2 in the cells from simulated microgravity conditions were consistent during passage culture, whereas cells from conventional gravity conditions exhibited a reduction of the neurogenic levels against an increase of their passage number. In growth culture, cells under simulated microgravity conditions showed less apical stress fibers over their nucleus with fewer cells having a polarization of lamin A/C than those under conventional gravity conditions. The ratio of lamin A/C to lamin B expression in the cells under simulated microgravity conditions was constant; however, cells cultured under conventional gravity conditions showed an increase in the lamin ratio during passages. Furthermore, analysis of activating H3K4me3 and repressive H3K27me3 modifications at promoters of neuronal lineage genes indicated that cells passaged under simulated microgravity conditions sustained the methylation during serial cultivation. Nevertheless, the enrichment of H3K27me3 significantly increased in the passaged cells cultured under conventional gravity conditions. These results demonstrated that simulated microgravity-coordinated cytoskeleton-lamin reorganization leads to suppression of histone modification associated with neurogenic differentiation capacity of passaged hMSCs.
Collapse
Affiliation(s)
- Chaiyong Koaykul
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Osaka, Japan
| | - Mee-Hae Kim
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Osaka, Japan
| | | | - Louis Yuge
- Space Bio-Laboratories Co., Ltd., Hiroshima, Japan.,Division of Bio-Environmental Adaptation Sciences, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Masahiro Kino-Oka
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Osaka, Japan
| |
Collapse
|
19
|
González-Cruz RD, Dahl KN, Darling EM. The Emerging Role of Lamin C as an Important LMNA Isoform in Mechanophenotype. Front Cell Dev Biol 2018; 6:151. [PMID: 30450357 PMCID: PMC6224339 DOI: 10.3389/fcell.2018.00151] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [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: 08/21/2018] [Accepted: 10/15/2018] [Indexed: 12/17/2022] Open
Abstract
Lamin A and lamin C isoforms of the gene LMNA are major structural and mechanotransductive components of the nuclear lamina. Previous reports have proposed lamin A as the isoform with the most dominant contributions to cellular mechanophenotype. Recently, expression of lamin C has also been shown to strongly correlate to cellular elastic and viscoelastic properties. Nevertheless, LMNA isoforms exist as part of a network that collectively provides structural integrity to the nucleus and their expression is ultimately regulated in a cell-specific manner. Thus, they have importance in mechanotransduction and structural integrity of the nucleus as well as potential candidates for biomarkers of whole-cell mechanophenotype. Therefore, a fuller discussion of lamin isoforms as mechanophenotypic biomarkers should compare both individual and ratiometric isoform contributions toward whole-cell mechanophenotype across different cell types. In this perspective, we discuss the distinctions between the mechanophenotypic correlations of individual and ratiometric lamins A:B1, C:B1, (A + C):B1, and C:A across cells from different lineages, demonstrating that the collective contribution of ratiometric lamin (A + C):B1 isoforms exhibited the strongest correlation to whole-cell stiffness. Additionally, we highlight the potential roles of lamin isoform ratios as indicators of mechanophenotypic change in differentiation and disease to demonstrate that the contributions of individual and collective lamin isoforms can occur as both static and dynamic biomarkers of mechanophenotype.
Collapse
Affiliation(s)
| | - Kris N Dahl
- Department of Chemical Engineering, Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, PA, United States
| | - Eric M Darling
- Center for Biomedical Engineering, Brown University, Providence, RI, United States.,Department of Molecular Pharmacology, Physiology and Biotechnology, School of Engineering, Department of Orthopaedics, Brown University, Providence, RI, United States
| |
Collapse
|
20
|
Shin JY, Le Dour C, Sera F, Iwata S, Homma S, Joseph LC, Morrow JP, Dauer WT, Worman HJ. Depletion of lamina-associated polypeptide 1 from cardiomyocytes causes cardiac dysfunction in mice. Nucleus 2014; 5:260-459. [PMID: 24859316 DOI: 10.4161/nucl.29227] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [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
We previously showed that striated muscle-selective depletion of lamina-associated polypeptide 1 (LAP1), an integral inner nuclear membrane protein, leads to profound muscular dystrophy with premature death in mice. As LAP1 is also depleted in hearts of these mice, we examined their cardiac phenotype. Striated muscle-selective LAP1 knockout mice display ventricular systolic dysfunction with abnormal induction of genes encoding cardiomyopathy related proteins. To eliminate possible confounding effects due to skeletal muscle pathology, we generated a new mouse line in which LAP1 is deleted in a cardiomyocyte-selective manner. These mice had no skeletal muscle pathology and appeared overtly normal at 20 weeks of age. However, cardiac echocardiography revealed that they developed left ventricular systolic dysfunction and cardiac gene expression analysis revealed abnormal induction of cardiomyopathy-related genes. Our results demonstrate that LAP1 expression in cardiomyocytes is required for normal left ventricular function, consistent with a report of cardiomyopathy in a human subject with mutation in the gene encoding LAP1.
Collapse
Affiliation(s)
- Ji-Yeon Shin
- Department of Medicine; College of Physicians & Surgeons; Columbia University; New York, NY USA; Department of Pathology and Cell Biology; College of Physicians & Surgeons; Columbia University; New York, NY USA
| | - Caroline Le Dour
- Department of Medicine; College of Physicians & Surgeons; Columbia University; New York, NY USA; Department of Pathology and Cell Biology; College of Physicians & Surgeons; Columbia University; New York, NY USA
| | - Fusako Sera
- Department of Medicine; College of Physicians & Surgeons; Columbia University; New York, NY USA
| | - Shinichi Iwata
- Department of Medicine; College of Physicians & Surgeons; Columbia University; New York, NY USA
| | - Shunichi Homma
- Department of Medicine; College of Physicians & Surgeons; Columbia University; New York, NY USA
| | - Leroy C Joseph
- Department of Medicine; College of Physicians & Surgeons; Columbia University; New York, NY USA
| | - John P Morrow
- Department of Medicine; College of Physicians & Surgeons; Columbia University; New York, NY USA
| | - William T Dauer
- Department of Neurology; University of Michigan Medical School; Ann Arbor, MI USA; Department of Cell and Developmental Biology; University of Michigan Medical School; Ann Arbor, MI USA
| | - Howard J Worman
- Department of Medicine; College of Physicians & Surgeons; Columbia University; New York, NY USA; Department of Pathology and Cell Biology; College of Physicians & Surgeons; Columbia University; New York, NY USA
| |
Collapse
|
21
|
Babbio F, Castiglioni I, Cassina C, Gariboldi MB, Pistore C, Magnani E, Badaracco G, Monti E, Bonapace IM. Knock-down of methyl CpG-binding protein 2 (MeCP2) causes alterations in cell proliferation and nuclear lamins expression in mammalian cells. BMC Cell Biol 2012; 13:19. [PMID: 22783988 PMCID: PMC3477090 DOI: 10.1186/1471-2121-13-19] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 07/03/2012] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND MeCP2 (CpG-binding protein 2) is a nuclear multifunctional protein involved in several cellular processes, like large-scale chromatin reorganization and architecture, and transcriptional regulation. In recent years, a non-neuronal role for MeCP2 has emerged in cell growth and proliferation. Mutations in the MeCP2 gene have been reported to determine growth disadvantages in cultured lymphocyte cells, and its functional ablation suppresses cell growth in glial cells and proliferation in mesenchymal stem cells and prostate cancer cells. MeCP2 interacts with lamin B receptor (LBR) and with Heterochromatin Protein 1 (HP1) at the nuclear envelope (NE), suggesting that it could be part of complexes involved in attracting heterochromatin at the nuclear periphery and in mediating gene silencing. The nuclear lamins, major components of the lamina, have a role in maintaining NE integrity, in orchestrating mitosis, in DNA replication and transcription, in regulation of mitosis and apoptosis and in providing anchoring sites for chromatin domains.In this work, we inferred that MeCP2 might have a role in nuclear envelope stability, thereby affecting the proliferation pattern of highly proliferating systems. RESULTS By performing knock-down (KD) of MeCP2 in normal murine (NIH-3 T3) and in human prostate transformed cells (PC-3 and LNCaP), we observed a strong proliferation decrease and a defect in the cell cycle progression, with accumulation of cells in S/G2M, without triggering a strong apoptotic and senescent phenotype. In these cells, KD of MeCP2 evidenced a considerable decrease of the levels of lamin A, lamin C, lamin B1 and LBR proteins. Moreover, by confocal analysis we confirmed the reduction of lamin A levels, but we also observed an alteration in the shape of the nuclear lamina and an irregular nuclear rim. CONCLUSIONS Our results that indicate reduced levels of NE components, are consistent with a hypothesis that the deficiency of MeCP2 might cause the lack of a key "bridge" function that links the peripheral heterochromatin to the NE, thereby causing an incorrect assembly of the NE itself, together with a decreased cell proliferation and viability.
Collapse
Affiliation(s)
- Federica Babbio
- Department of Theoretical and Applied Sciences, Insubria University, via A. da Giussano 10, Busto Arsizio, 21052, Italy
| | - Ilaria Castiglioni
- Department of Theoretical and Applied Sciences, Insubria University, via A. da Giussano 10, Busto Arsizio, 21052, Italy
| | - Chiara Cassina
- Department of Theoretical and Applied Sciences, Insubria University, via A. da Giussano 10, Busto Arsizio, 21052, Italy
| | - Marzia Bruna Gariboldi
- Department of Theoretical and Applied Sciences, Insubria University, via A. da Giussano 10, Busto Arsizio, 21052, Italy
| | - Christian Pistore
- Department of Theoretical and Applied Sciences, Insubria University, via A. da Giussano 10, Busto Arsizio, 21052, Italy
| | - Elena Magnani
- Department of Theoretical and Applied Sciences, Insubria University, via A. da Giussano 10, Busto Arsizio, 21052, Italy
| | - Gianfranco Badaracco
- Department of Biotechnologies and Life Sciences, Insubria University, via H. J. Dunant 3, Varese 21100, Italy
| | - Elena Monti
- Department of Theoretical and Applied Sciences, Insubria University, via A. da Giussano 10, Busto Arsizio, 21052, Italy
| | - Ian Marc Bonapace
- Department of Theoretical and Applied Sciences, Insubria University, via A. da Giussano 10, Busto Arsizio, 21052, Italy
| |
Collapse
|
22
|
Abstract
In open mitosis the nuclear envelope (NE) reassembles at the end of each mitosis. This process involves the reformation of the nuclear pore complex (NPC), the inner and outer nuclear membranes, and the nuclear lamina. In human cells cell cycle-dependent NE subdomains exist, characterized as A-type lamin-rich/NPC-free or B-type lamin-rich/NPC-rich, which are initially formed as core or noncore regions on mitotic chromosomes, respectively. Although postmitotic NE formation has been extensively studied, little is known about the coordination of NPC and NE assembly. Here, we report that the nucleoporin ELYS/Mel28, which is crucial for postmitotic NPC formation, is essential for recruiting the lamin B receptor (LBR) to the chromosomal noncore region. Furthermore, ELYS/Mel28 is responsible for focusing of A-type lamin-binding proteins like emerin, Lap2α and the barrier-to-autointegration factor (BAF) at the chromosomal core region. ELYS/Mel28 biochemically interacts with the LBR in a phosphorylation-dependent manner. Recruitment of the LBR depends on the nucleoporin Nup107, which interacts with ELYS/Mel28 but not on nucleoporin Pom121, suggesting that the specific molecular interactions with ELYS/Mel28 are involved in the NE assembly at the noncore region. The depletion of the LBR affected neither the behavior of emerin nor Lap2α indicating that the recruitment of the LBR to mitotic chromosomes is not involved in formation of the core region. The depletion of ELYS/Mel28 also accelerates the entry into cytokinesis after recruitment of emerin to chromosomes. Our data show that ELYS/Mel28 plays a role in NE subdomain formation in late mitosis.
Collapse
Affiliation(s)
- Michaela Clever
- Cellular Dynamics Laboratory; Riken Advanced Science Institute; Saitama, Japan
| | - Tomoko Funakoshi
- Cellular Dynamics Laboratory; Riken Advanced Science Institute; Saitama, Japan
- Live-Cell Molecular Imaging Research Team; Riken Advanced Science Institute; Saitama, Japan
| | - Yasuhiro Mimura
- Cellular Dynamics Laboratory; Riken Advanced Science Institute; Saitama, Japan
| | - Masatoshi Takagi
- Cellular Dynamics Laboratory; Riken Advanced Science Institute; Saitama, Japan
| | - Naoko Imamoto
- Cellular Dynamics Laboratory; Riken Advanced Science Institute; Saitama, Japan
| |
Collapse
|
23
|
Linde N, Stick R. Intranuclear membranes induced by lipidated proteins are derived from the nuclear envelope. Nucleus 2010; 1:343-53. [PMID: 21327083 DOI: 10.4161/nucl.1.4.12352] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 04/22/2010] [Accepted: 04/28/2010] [Indexed: 01/12/2023] Open
Abstract
Association of nuclear lamins with the inner nuclear membrane (INM) is mediated by lipid modifications: either by C-terminal isoprenylation or N-terminal myristoylation. Overexpression of lamins or other lipidated nuclear proteins induces the formation of intranuclear membrane-like arrays. Lamin-induced intranuclear array formation has been observed in Xenopus oocytes as well as in mammalian tissue culture cells. With the use of a membrane-specific fluorescence dye we show here that these arrays are made up of typical lipid membranes. While continuity between these intranuclear membranes and the INM has not been observed so far the presence of integral as well as luminal marker proteins of the endoplasmic reticulum (ER) indicates that these membranes are derived from the nuclear membrane/ER compartment. Earlier studies demonstrated that overexpression of integral membrane proteins of the INM can induce formation of intranuclear membranes, which bud from the INM. Integral membrane proteins reach the INM via the pore membranes while lipidated proteins are imported into the nucleoplasm via the classical NLS pathway where they interact with the INM via their lipid moieties. Together with the previously published data our results show that the formation of intranuclear membranes follows similar routes irrespective of whether the proteins triggering membrane formation are integral membrane or lipidated proteins.
Collapse
Affiliation(s)
- Nina Linde
- Department of Cell Biology, University of Bremen, Bremen, Germany
| | | |
Collapse
|
24
|
von Moeller F, Barendziak T, Apte K, Goldberg MW, Stick R. Molecular characterization of Xenopus lamin LIV reveals differences in the lamin composition of sperms in amphibians and mammals. Nucleus 2010; 1:85-95. [PMID: 21327107 PMCID: PMC3035121 DOI: 10.4161/nucl.1.1.10517] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Revised: 11/04/2009] [Accepted: 11/04/2009] [Indexed: 02/06/2023] Open
Abstract
Lamins are nuclear intermediate filament proteins. They are involved in most nuclear activities and are essential for retaining the mechano-elastic properties of the nucleus. Somatic cells of vertebrates express lamins A, B1 and B2 while lamin LIII, a major component of the amphibian oocyte lamina is absent in mammals. The organization of the lamina of germ cells differs significantly from that of somatic cells. Mammalian spermatogenic cells express two short lamins, C2 and B3, that are splice isoforms of lamin A and B2, respectively. Here we identify the previously described Xenopus lamin LIV as splice variant of the lamin LIII gene. LIV contains 40 extra residues in coil 2A of the rod domain, which results in altered assembly properties. Xenopus lamin LIV and mammalian B3 assemble into short structures rather than into long IF-like filaments. Expression of lamin LIV is restricted to male germ cells suggesting that it might be the functional equivalent of mammalian lamin B3. We provide evidence that lamins C2 and B3 are restricted to the mammalian lineage and describe the lamin composition of Xenopus sperm. Our results show that the evolution of germ cell-specific lamins followed separate and distinctly different paths in amphibians and mammals.
Collapse
Affiliation(s)
| | - Tanja Barendziak
- Department of Cell Biology; University of Bremen; Bremen, Germany
| | - Ketaki Apte
- Department of Cell Biology; University of Bremen; Bremen, Germany
| | - Martin W Goldberg
- School of Biological and Biomedical Sciences; The University of Durham; Durham, UK
| | - Reimer Stick
- Department of Cell Biology; University of Bremen; Bremen, Germany
| |
Collapse
|
25
|
Abstract
The dynamic ability of genomes to interact with discrete nuclear compartments appears to be essential for chromatin function. However, the extent to which structural nuclear proteins contribute to this level of organization is largely unresolved. To test the links between structure and function, we evaluated how nuclear lamins contribute to the organization of a major functional compartment, the nucleolus. HeLa cells with compromised expression of the genes encoding lamins were analyzed using high-resolution imaging and pull-down assays. When lamin B1 expression was depleted, inhibition of RNA synthesis correlated with complex structural changes within the nucleolar active centers until, eventually, the nucleoli were dispersed completely. With normal lamin expression, the nucleoli were highly plastic, with dramatic and freely reversible structural changes correlating with the demand for ribosome biogenesis. Preservation of the nucleolar compartment throughout these structural transitions is shown to be linked to lamin B1 expression, with the lamin B1 protein interacting with the major nucleolar protein nucleophosmin/B23.
Collapse
Affiliation(s)
- Catherine Martin
- Faculty of Life Sciences, University of Manchester, MIB, 131 Princess Street, Manchester M1 7DN, UK
| | | | | | | | | | | |
Collapse
|
26
|
Venables RS, McLean S, Luny D, Moteleb E, Morley S, Quinlan RA, Lane EB, Hutchison CJ. Expression of individual lamins in basal cell carcinomas of the skin. Br J Cancer 2001; 84:512-9. [PMID: 11207047 PMCID: PMC2363768 DOI: 10.1054/bjoc.2000.1632] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2000] [Revised: 11/09/2000] [Accepted: 11/14/2000] [Indexed: 11/18/2022] Open
Abstract
In this study we used a unique collection of type specific anti-lamin antibodies to study lamin expression patterns in normal human skin and in skin derived from patients with basal cell carcinomas (BCCs). Lamin expression in serial sections from frozen tissue samples was investigated by single and double indirect immunofluorescence. In normal skin, lamin A was expressed in dermal fibroblasts and in suprabasal epithelial cells but was absent from all basal epithelial cells. Lamin C was expressed in dermal fibroblasts, suprabasal epithelial cells and a majority of basal epithelial cells. However, lamin C was not expressed in quiescent basal epithelial cells. Lamin B1 was expressed in all epithelial cells but was not expressed in dermal fibroblasts. Finally, lamin B2 was expressed in all epithelial cells but was not expressed in dermal fibroblasts. Finally, lamin B2 was expressed in all cell types in normal skin. Lamin expression was also investigated in a collection of 16 BCCs taken from a variety of body sites. Based upon patterns of lamin expression the BCCs were classified into four groups: A-negative (10/16 tumours), C-negative (5/16 tumours), A/C-negative (1/16 tumours) and A/B2-negative (1/16 tumours). Lamin expression was also compared to cell proliferation index by staining serial sections with the proliferation marker Ki67. 9/10 of the lamin A negative tumours were highly proliferative, whereas 4/5 of the lamin C negative tumours were slow growing. Thus as a general rule absence of lamin A was correlated with rapid growth within the tumour, while absence of lamin C was correlated with slow growth within the tumour. Our data supports the hypothesis that lamin A has a negative influence on cell proliferation and its down regulation may be a requisite of tumour progression.
Collapse
Affiliation(s)
- R S Venables
- Department of Biological Sciences, University of Dundee, UK
| | | | | | | | | | | | | | | |
Collapse
|