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Mademtzoglou D, Asakura Y, Borok MJ, Alonso-Martin S, Mourikis P, Kodaka Y, Mohan A, Asakura A, Relaix F. Cellular localization of the cell cycle inhibitor Cdkn1c controls growth arrest of adult skeletal muscle stem cells. eLife 2018; 7:33337. [PMID: 30284969 PMCID: PMC6172026 DOI: 10.7554/elife.33337] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2017] [Accepted: 09/02/2018] [Indexed: 01/01/2023] Open
Abstract
Adult skeletal muscle maintenance and regeneration depend on efficient muscle stem cell (MuSC) functions. The mechanisms coordinating cell cycle with activation, renewal, and differentiation of MuSCs remain poorly understood. Here, we investigated how adult MuSCs are regulated by CDKN1c (p57kip2), a cyclin-dependent kinase inhibitor, using mouse molecular genetics. In the absence of CDKN1c, skeletal muscle repair is severely impaired after injury. We show that CDKN1c is not expressed in quiescent MuSCs, while being induced in activated and proliferating myoblasts and maintained in differentiating myogenic cells. In agreement, isolated Cdkn1c-deficient primary myoblasts display differentiation defects and increased proliferation. We further show that the subcellular localization of CDKN1c is dynamic; while CDKN1c is initially localized to the cytoplasm of activated/proliferating myoblasts, progressive nuclear translocation leads to growth arrest during differentiation. We propose that CDKN1c activity is restricted to differentiating myoblasts by regulated cyto-nuclear relocalization, coordinating the balance between proliferation and growth arrest.
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Affiliation(s)
- Despoina Mademtzoglou
- Inserm, IMRB U955-E10, F-94010, Créteil, France.,Ecole Nationale Veterinaire d'Alfort, Faculté de medecine, F-94000, Université Paris-Est Creteil, Maison Alfort, France
| | - Yoko Asakura
- Stem Cell Institute, Paul and Sheila Wellstone Muscular Dystrophy Center, Department of Neurology, University of Minnesota Medical School, Minneapolis, United States
| | - Matthew J Borok
- Inserm, IMRB U955-E10, F-94010, Créteil, France.,Ecole Nationale Veterinaire d'Alfort, Faculté de medecine, F-94000, Université Paris-Est Creteil, Maison Alfort, France
| | - Sonia Alonso-Martin
- Inserm, IMRB U955-E10, F-94010, Créteil, France.,Ecole Nationale Veterinaire d'Alfort, Faculté de medecine, F-94000, Université Paris-Est Creteil, Maison Alfort, France
| | - Philippos Mourikis
- Inserm, IMRB U955-E10, F-94010, Créteil, France.,Ecole Nationale Veterinaire d'Alfort, Faculté de medecine, F-94000, Université Paris-Est Creteil, Maison Alfort, France
| | - Yusaku Kodaka
- Stem Cell Institute, Paul and Sheila Wellstone Muscular Dystrophy Center, Department of Neurology, University of Minnesota Medical School, Minneapolis, United States
| | - Amrudha Mohan
- Stem Cell Institute, Paul and Sheila Wellstone Muscular Dystrophy Center, Department of Neurology, University of Minnesota Medical School, Minneapolis, United States
| | - Atsushi Asakura
- Stem Cell Institute, Paul and Sheila Wellstone Muscular Dystrophy Center, Department of Neurology, University of Minnesota Medical School, Minneapolis, United States
| | - Frederic Relaix
- Inserm, IMRB U955-E10, F-94010, Créteil, France.,Ecole Nationale Veterinaire d'Alfort, Faculté de medecine, F-94000, Université Paris-Est Creteil, Maison Alfort, France.,Etablissement Français du Sang, Créteil, France.,APHP, Hopitaux Universitaires Henri Mondor, DHU Pepsy & Centre de Référence des Maladies Neuromusculaires GNMH, Créteil, France
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Mohan A, Asakura A. CDK inhibitors for muscle stem cell differentiation and self-renewal. ACTA ACUST UNITED AC 2017; 6:65-74. [PMID: 28713664 DOI: 10.7600/jpfsm.6.65] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Regeneration of muscle is undertaken by muscle stem cell populations named satellite cells which are normally quiescent or at the G0 phase of the cell cycle. However, upon signals from damaged muscle, satellite cells lose their quiescence, and enter the G1 cell cycle phase to expand the population of satellite cell progenies termed myogenic precursor cells (MPCs). Eventually, MPCs stop their cell cycle and undergo terminal differentiation to form skeletal muscle fibers. Some MPCs retract to quiescent satellite cells as a self-renewal process. Therefore, cell cycle regulation, consisting of satellite cell activation, proliferation, differentiation and self-renewal, is the key event of muscle regeneration. In this review, we summarize up-to-date progress on research about cell cycle regulation of myogenic progenitor cells and muscle stem cells during embryonic myogenesis and adult muscle regeneration, aging, exercise and muscle diseases including muscular dystrophy and muscle fiber atrophy, especially focusing on cyclin-dependent kinase inhibitors (CDKIs).
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Affiliation(s)
- Amrudha Mohan
- Stem Cell Institute, Paul and Sheila Wellstone Muscular Dystrophy Center, Department of Neurology, University of Minnesota Medical School, 2001 6th Street SE, MTRF 4-220, Minneapolis, MN 55455, USA
| | - Atsushi Asakura
- Stem Cell Institute, Paul and Sheila Wellstone Muscular Dystrophy Center, Department of Neurology, University of Minnesota Medical School, 2001 6th Street SE, MTRF 4-220, Minneapolis, MN 55455, USA
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3
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Li H, Xu W, Ma Y, Zhou S. Separation and purification of the bovine milk fat globule membrane protein and its effect on improvement of C2C12mouse skeletal muscle cell proliferation. NEW J CHEM 2017. [DOI: 10.1039/c7nj00560a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A novel method to improve the proliferation activity of C2C12cells by the bovine milk fat globule membrane (MFGM) protein was established in this study.
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Affiliation(s)
- He Li
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150090
- P. R. China
| | - Weili Xu
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150090
- P. R. China
| | - Ying Ma
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin 150090
- P. R. China
| | - Shaobo Zhou
- School of Life Sciences
- Institute of Biomedical and Environmental Science and Technology
- University of BedfordshireLuton
- UK
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Hrgovic I, Doll M, Kleemann J, Wang XF, Zoeller N, Pinter A, Kippenberger S, Kaufmann R, Meissner M. The histone deacetylase inhibitor trichostatin a decreases lymphangiogenesis by inducing apoptosis and cell cycle arrest via p21-dependent pathways. BMC Cancer 2016; 16:763. [PMID: 27716272 PMCID: PMC5045659 DOI: 10.1186/s12885-016-2807-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 09/23/2016] [Indexed: 01/05/2023] Open
Abstract
Background The formation of new lymphatic vessels provides an additional route for tumour cells to metastasize. Therefore, inhibiting lymphangiogenesis represents an interesting target in cancer therapy. First evidence suggests that histone deacetylase inhibitors (HDACi) may mediate part of their antitumor effects by interfering with lymphangiogenesis. However, the underlying mechanisms of HDACi induced anti-lymphangiogenic properties are not fully investigated so far and in part remain unknown. Methods Human lymphatic endothelial cells (LEC) were cultured in vitro and treated with or without HDACi. Effects of HDACi on proliferation and cell cycle progress were analysed by BrdU assay and flow cytometry. Apoptosis was measured by quantifying mono- and oligonucleosomes in the cytoplasmic fraction of cell lysates. In vitro lymphangiogenesis was investigated using the Matrigel short term lymphangiogenesis assay. The effects of TSA on cell cycle regulatory proteins and apoptosis-related proteins were examined by western blotting, immunofluorescence staining and semi-quantitative RT-PCR. Protein- and mRNA half-life of p21 were analysed by western blotting and quantitative RT-PCR. The activity of the p21 promoter was determined using a dual luciferase assay and DNA-binding activity of Sp1/3 was investigated using EMSA. Furthermore, siRNA assays were performed to analyse the role of p21 and p53 on TSA-mediated anti-lymphangiogenic effects. Results We found that HDACi inhibited cell proliferation and that the pan-HDACi TSA induced G0/G1 arrest in LEC. Cell cycle arrest was accompanied by up-regulation of p21, p27 and p53. Additionally, we observed that p21 protein accumulated in cellular nuclei after treatment with TSA. Moreover, we found that p21 mRNA was significantly up-regulated by TSA, while the protein and mRNA half-life remained largely unaffected. The promoter activity of p21 was enhanced by TSA indicating a transcriptional mechanism. Subsequent EMSA analyses showed increased constitutive Sp1/3-dependent DNA binding in response to HDACi. We demonstrated that p53 was not required for TSA induced p21 expression and growth inhibition of LECs. Interestingly, siRNA-mediated p21 depletion almost completely reversed the anti-proliferative effects of TSA in LEC. In addition, TSA induced apoptosis by cytochrome c release contributed to activating caspases-9, −7 and −3 and downregulating the anti-apoptotic proteins cIAP-1 and −2. Conclusions In conclusion, we demonstrate that TSA - a pan-HDACi - has distinct anti-lymphangiogenic effects in primary human lymphatic endothelial cells by activating intrinsic apoptotic pathway and cell cycle arrest via p21-dependent pathways. Electronic supplementary material The online version of this article (doi:10.1186/s12885-016-2807-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Igor Hrgovic
- Department of Dermatology, Venereology and Allergology, Goethe University, Theodor-Stern Kai 7, Frankfurt/Main, 60590, Germany. .,Klinik für Dermatologie, Venerologie und Allergologie, Klinikum der J. W. Goethe-Universität, Theodor-Stern-Kai 7, Frankfurt am Main, D-60590, Germany.
| | - Monika Doll
- Department of Dermatology, Venereology and Allergology, Goethe University, Theodor-Stern Kai 7, Frankfurt/Main, 60590, Germany
| | - Johannes Kleemann
- Department of Dermatology, Venereology and Allergology, Goethe University, Theodor-Stern Kai 7, Frankfurt/Main, 60590, Germany
| | - Xiao-Fan Wang
- Department of Pharmacology & Cancer Biology, Duke University School of Medicine, C218 LSRC, Box 3813, Durham, NC, 27710, USA
| | - Nadja Zoeller
- Department of Dermatology, Venereology and Allergology, Goethe University, Theodor-Stern Kai 7, Frankfurt/Main, 60590, Germany
| | - Andreas Pinter
- Department of Dermatology, Venereology and Allergology, Goethe University, Theodor-Stern Kai 7, Frankfurt/Main, 60590, Germany
| | - Stefan Kippenberger
- Department of Dermatology, Venereology and Allergology, Goethe University, Theodor-Stern Kai 7, Frankfurt/Main, 60590, Germany
| | - Roland Kaufmann
- Department of Dermatology, Venereology and Allergology, Goethe University, Theodor-Stern Kai 7, Frankfurt/Main, 60590, Germany
| | - Markus Meissner
- Department of Dermatology, Venereology and Allergology, Goethe University, Theodor-Stern Kai 7, Frankfurt/Main, 60590, Germany
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Changes in granulosa cells gene expression associated with growth, plateau and atretic phases in medium bovine follicles. J Ovarian Res 2014; 7:50. [PMID: 24955130 PMCID: PMC4046060 DOI: 10.1186/1757-2215-7-50] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 04/11/2014] [Indexed: 11/29/2022] Open
Abstract
Background The objective of this study was to build the transcriptomic profile of granulosa cells originating from follicles 6 to 9 mm in diameter in dairy cattle using microarrays. Methods Granulosa cells originating from three different phases of antral follicle growth were compared: growing (G), plateau (P) and atresia (A), as categorized by flow cytometry profiles of DNA. The growing and atretic conditions were each hybridized against the plateau condition as a reference in order to understand the specific biological mechanisms modulated in this class of follicles. Results 2,942 genes were differentially expressed (P < 0.05) in P vs. G and 1,974 in A vs. P. A clear segregation of the 3 phases was confirmed by between group analysis (BGA). The first characteristic of the plateau phase is the activation of the upstream regulators TP53 and PTEN which participate in the reduction of cell growth through MYC, FOS and E2F1-2-3. We also observed the down-regulation of steroidogenesis genes: CYP11A1 and CYP19A1, in the granulosa cells of the plateau phase relative to the growth phase. On the other hand, the A vs. P contrast showed up-regulation of multiple transcripts associated to apoptosis: CCT2, DAB2, DSG2 and TGM2. Conclusions This study offers multiple candidate genes to be further studied in order to elucidate their role in the modulation of follicular development and, ultimately, of oocyte quality.
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Giacobbe A, Bongiorno-Borbone L, Bernassola F, Terrinoni A, Markert EK, Levine AJ, Feng Z, Agostini M, Zolla L, Agrò AF, Notterman DA, Melino G, Peschiaroli A. p63 regulates glutaminase 2 expression. Cell Cycle 2013; 12:1395-405. [PMID: 23574722 DOI: 10.4161/cc.24478] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The transcription factor p63 is critical for many biological processes, including development and maintenance of epidermal tissues and tumorigenesis. Here, we report that the TAp63 isoforms regulate cell metabolism through the induction of the mitochondrial glutaminase 2 (GLS2) gene both in primary cells and tumor cell lines. By ChIP analysis and luciferase assay, we confirmed that TAp63 binds directly to the p53/p63 consensus DNA binding sequence within the GLS2 promoter region. Given the critical role of p63 in epidermal differentiation, we have investigated the regulation of GLS2 expression during this process. GLS2 and TAp63 expression increases during the in vitro differentiation of primary human keratinocytes, and depletion of GLS2 inhibits skin differentiation both at molecular and cellular levels. We found that GLS2 and TAp63 expression are concomitantly induced in cancer cells exposed to oxidative stresses. siRNA-mediated depletion of GLS2 sensitizes cells to ROS-induced apoptosis, suggesting that the TAp63/GLS2 axis can be functionally important as a cellular antioxidant pathway in the absence of p53. Accordingly, we found that GLS2 is upregulated in colon adenocarcinoma. Altogether, our findings demonstrate that GLS2 is a bona fide TAp63 target gene, and that the TAp63-dependent regulation of GLS2 is important for both physiological and pathological processes.
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Affiliation(s)
- Arianna Giacobbe
- Department of Experimental Medicine and Surgery, University of Rome Tor Vergata, Rome, Italy
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7
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The myogenic kinome: protein kinases critical to mammalian skeletal myogenesis. Skelet Muscle 2011; 1:29. [PMID: 21902831 PMCID: PMC3180440 DOI: 10.1186/2044-5040-1-29] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2011] [Accepted: 09/08/2011] [Indexed: 12/13/2022] Open
Abstract
Myogenesis is a complex and tightly regulated process, the end result of which is the formation of a multinucleated myofibre with contractile capability. Typically, this process is described as being regulated by a coordinated transcriptional hierarchy. However, like any cellular process, myogenesis is also controlled by members of the protein kinase family, which transmit and execute signals initiated by promyogenic stimuli. In this review, we describe the various kinases involved in mammalian skeletal myogenesis: which step of myogenesis a particular kinase regulates, how it is activated (if known) and what its downstream effects are. We present a scheme of protein kinase activity, similar to that which exists for the myogenic transcription factors, to better clarify the complex signalling that underlies muscle development.
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8
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Hosoyama T, Nishijo K, Prajapati SI, Li G, Keller C. Rb1 gene inactivation expands satellite cell and postnatal myoblast pools. J Biol Chem 2011; 286:19556-64. [PMID: 21478154 DOI: 10.1074/jbc.m111.229542] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Satellite cells are well known as a postnatal skeletal muscle stem cell reservoir that under injury conditions participate in repair. However, mechanisms controlling satellite cell quiescence and activation are the topic of ongoing inquiry by many laboratories. In this study, we investigated whether loss of the cell cycle regulatory factor, pRb, is associated with the re-entry of quiescent satellite cells into replication and subsequent stem cell expansion. By ablation of Rb1 using a Pax7CreER,Rb1 conditional mouse line, satellite cell number was increased 5-fold over 6 months. Furthermore, myoblasts originating from satellite cells lacking Rb1 were also increased 3-fold over 6 months, while terminal differentiation was greatly diminished. Similarly, Pax7CreER,Rb1 mice exhibited muscle fiber hypotrophy in vivo under steady state conditions as well as a delay of muscle regeneration following cardiotoxin-mediated injury. These results suggest that cell cycle re-entry of quiescent satellite cells is accelerated by lack of Rb1, resulting in the expansion of both satellite cells and their progeny in adolescent muscle. Conversely, that sustained Rb1 loss in the satellite cell lineage causes a deficit of muscle fiber formation. However, we also show that pharmacological inhibition of protein phosphatase 1 activity, which will result in pRb inactivation accelerates satellite cell activation and/or expansion in a transient manner. Together, our results raise the possibility that reversible pRb inactivation in satellite cells and inhibition of protein phosphorylation may provide a new therapeutic tool for muscle atrophy by short term expansion of the muscle stem cells and myoblast pool.
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Affiliation(s)
- Tohru Hosoyama
- Greehey Children's Cancer Research Institute, University of Texas Health Science Center, San Antonio, Texas 78229, USA
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Hirai H, Verma M, Watanabe S, Tastad C, Asakura Y, Asakura A. MyoD regulates apoptosis of myoblasts through microRNA-mediated down-regulation of Pax3. ACTA ACUST UNITED AC 2011; 191:347-65. [PMID: 20956382 PMCID: PMC2958479 DOI: 10.1083/jcb.201006025] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Suppression of the myogenic transcription factor MyoD is required for maintenance of muscle stem cells. The molecules that regulate the apoptosis cascade are also involved in differentiation and syncytial fusion in skeletal muscle. MyoD is a myogenic transcription factor that plays essential roles in muscle differentiation. We noticed that MyoD−/− myoblasts display remarkable resistance to apoptosis by down-regulation of miR-1 (microRNA-1) and miR-206 and by up-regulation of Pax3. This resulted in transcriptional activation of antiapoptotic factors Bcl-2 and Bcl-xL. Forced MyoD expression induces up-regulation of miR-1 and miR-206 and down-regulation of Pax3, Bcl-2, and Bcl-xL along with increased apoptosis in MyoD−/− myoblasts. In contrast, MyoD gene knockdown increases cell survival of wild-type myoblasts. The 3′ untranslated region of Pax3 mRNA contains two conserved miR-1/miR-206–binding sites, which are required for targeting of these microRNAs (miRNAs). Therefore, these data suggest that MyoD not only regulates terminal differentiation but also apoptosis through miRNA-mediated down-regulation of Pax3. Finally, MyoD, miR-1, and miR-206 are all down-regulated in quiescent satellite cells, which may be required for maintenance of muscle stem cells.
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Affiliation(s)
- Hiroyuki Hirai
- Stem Cell Institute, Department of Neurology, University of Minnesota Medical School, Minneapolis, MN 55455, USA
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Harford TJ, Shaltouki A, Weyman CM. Increased expression of the pro-apoptotic Bcl2 family member PUMA and apoptosis by the muscle regulatory transcription factor MyoD in response to a variety of stimuli. Apoptosis 2010; 15:71-82. [PMID: 19943111 DOI: 10.1007/s10495-009-0428-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We have previously reported that the level of MyoD expression correlates with the level of apoptosis that occurs in a subpopulation of skeletal myoblasts induced to differentiate by serum withdrawal. Herein we document that MyoD expression contributes to the level of apoptosis in myoblasts and fibroblasts in response to a variety of apoptotic stimuli. Specifically, re-expression of MyoD in skeletal myoblasts rendered defective for both differentiation and apoptosis by the expression of oncogenic Ras restores their ability to undergo both differentiation and apoptosis in response to serum withdrawal. Further, using a fibroblast cell line expressing an estrogen receptor:MyoD fusion protein, we have determined that addition of estrogen sensitizes these fibroblasts to apoptosis induced by serum withdrawal, or by treatment with etoposide or thapsigargin. RNAi mediated silencing of MyoD in either 23A2 or C2C12 myoblasts renders these cells resistant to apoptosis induced by serum withdrawal, or by treatment with etoposide or thapsigargin. Finally, MyoD mediated regulation of the apoptotic response to these various stimuli, in both myoblasts and fibroblasts, correlates with the level of induction of the pro-apoptotic Bcl2 family member PUMA.
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Affiliation(s)
- Terri J Harford
- Department of Biological, Geological, and Environmental Sciences, Cleveland State University, Center for Gene Regulation in Health and Disease, Cleveland, OH 44115, USA
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Shi H, Chen S, Jin H, Xu C, Dong G, Zhao Q, Wang W, Zhang H, Lin W, Zhang J, Davidovic L, Yao L, Fan D. Downregulation of MSP58 inhibits growth of human colorectal cancer cells via regulation of the cyclin D1-cyclin-dependent kinase 4-p21 pathway. Cancer Sci 2009; 100:1585-90. [PMID: 19549253 PMCID: PMC11158322 DOI: 10.1111/j.1349-7006.2009.01223.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
We have investigated the expression and role of the 58-kDa microspherule protein (MSP58) in colorectal carcinoma (CRC). By immuhistochemistry and immunofluorescence, we observed MSP58 in the nucleus and cytoplasm of CRC cells, and found MSP58 to be present in CRC specimens more often than in adjacent non-tumor tissues (92.5 vs 36.3%, P < 0.01). The average staining score in adjacent non-tumor tissues was significantly lower than in CRC tissues (2.05 +/- 1.13 vs 5.23 +/- 1.38, P < 0.01). Moreover, MSP58 mRNA and protein appeared to be upregulated in six fresh CRC samples compared to their adjacent non-cancerous tissues. MSP58 expression was also detected in the human CRC-derived cell lines LoVo, CoLo205, HCT116, HT-29, SW620, and SW480. Downregulation of MSP58 inhibited in vitro growth and attenuated tumor growth in animal models by induction of cell cycle arrest, and was associated with reduced levels of cyclin D1, cyclin-dependent kinase 4, phosphorylation-Rb (p-Rb), p21, and Retino blastoma (Rb) proteins. These results indicated that MSP58 might play an important role in the carcinogenesis of CRC via regulation of the cyclin D1-cyclin-dependent kinase 4-p21 pathway.
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Affiliation(s)
- Hai Shi
- State Key Laboratory of Cancer Biology and Department of Gastrointestinal Surgery, Xijing Hospital, Xi'an, China
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Distinct regulatory cascades govern extraocular and pharyngeal arch muscle progenitor cell fates. Dev Cell 2009; 16:810-21. [PMID: 19531352 DOI: 10.1016/j.devcel.2009.05.008] [Citation(s) in RCA: 261] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2008] [Revised: 04/09/2009] [Accepted: 05/15/2009] [Indexed: 11/22/2022]
Abstract
Genetic regulatory networks governing skeletal myogenesis in the body are well understood, yet their hierarchical relationships in the head remain unresolved. We show that either Myf5 or Mrf4 is necessary for initiating extraocular myogenesis. Whereas Mrf4 is dispensable for pharyngeal muscle progenitor fate, Tbx1 and Myf5 act synergistically for governing myogenesis in this location. As in the body, Myod acts epistatically to the initiating cascades in the head. Thus, complementary pathways, governed by Pax3 for body, and Tbx1 for pharyngeal muscles, but absent for extraocular muscles, activate the core myogenic network. These diverse muscle progenitors maintain their respective embryonic regulatory signatures in the adult. However, these signatures are not sufficient to ensure the specific muscle phenotypes, since the expected differentiated phenotype is not manifested when satellite cells are engrafted heterotopically. These findings identify novel genetic networks that may provide insights into myopathies which often affect only subsets of muscles.
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Benayahu D, Shefer G, Shur I. Insights into the transcriptional and chromatin regulation of mesenchymal stem cells in musculo-skeletal tissues. Ann Anat 2008; 191:2-12. [PMID: 18926677 DOI: 10.1016/j.aanat.2008.07.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2008] [Revised: 07/23/2008] [Accepted: 07/23/2008] [Indexed: 11/18/2022]
Abstract
Utilizing adult stem cells for regenerative medicine of skeletal tissues requires the development of molecular and biochemical tools that will allow isolation of these cells and direction of their differentiation towards a desired lineage and tissue formation. Stem cell commitment and fate decision into specialized functional cells involve coordinated activation and silencing of lineage-specific genes. Transcription factors and chromatin-remodeling proteins are key players in the control process of lineage commitment and differentiation during embryogenesis and adulthood. Transcription factors act in cooperation with co-regulator proteins to generate tissue-specific responses that elicits the tissue specific gene expression. Consequently, one of the main challenges of today's research is to characterize molecular pathways that coordinate the lineage-specific differentiation. Epigenetic regulation includes chromatin remodeling that control structural changes of DNA required for the binding of transcription factors to promoter regions. Revealing the mechanisms of action of such factors will provide understanding of how transcription and chromatin regulatory factors function together to regulate stem cell lineage fate decision.
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Affiliation(s)
- Dafna Benayahu
- Department of Cell and Developmental Biology, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv 69978, Israel.
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14
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Opposite roles of MRF4 and MyoD in cell proliferation and myogenic differentiation. Biochem Biophys Res Commun 2007; 364:476-82. [DOI: 10.1016/j.bbrc.2007.10.042] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2007] [Accepted: 10/07/2007] [Indexed: 11/21/2022]
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15
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Mouret S, Favier A, Beani JC, Leccia MT. Differential p53-mediated responses to solar-simulated radiation in human papillomavirus type 16-infected keratinocytes. Exp Dermatol 2007; 16:476-84. [PMID: 17518987 DOI: 10.1111/j.1600-0625.2007.00560.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In immunocompromised patients, cooperative effects of human papillomavirus (HPV) and ultraviolet (UV) radiation have been postulated in the development of non-melanoma skin cancers. The tumor suppressor p53 is a key component of the cellular response to genotoxic agents, such as UV radiation. We have previously demonstrated that in HPV16-infected cells, a higher E6* level was associated with a higher resistance to UV and oxidative stress. Using the two same SKv cell lines, the aim of the present study was to investigate p53 and p21 expression and cell death in HPV-infected keratinocytes in response to UV irradiation and to determine the role of HPV oncoprotein levels on the p53-mediated cellular response. We demonstrated that the weakly E6*-expressing level SKv-e cell line presented both higher cytotoxicity and apoptosis to UV. This high sensitivity was associated with both p53 and p21 nuclear accumulation, while a high E6* level and resistance were associated with no p53 accumulation and a p21 nuclear down-regulation after UV. Moreover, in SKv-e cell line, p21 promoter activation was p53 dependent. Our results suggest that an alteration and/or a modulation of the p53-p21 pathway in response to UV could be determinant for HPV-infected keratinocyte survival and HPV-associated carcinogenic process.
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Affiliation(s)
- Stéphane Mouret
- Laboratoire Oligoéléments et Résistance au Stress Oxydant induit par les Xénobiotiques (ORSOX; EA UJF, LRC7 CEA 8M), Université Joseph Fourier, UFR de Médecine et Pharmacie, La Tronche, France
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O’Flaherty J, Mei Y, Freer M, Weyman CM. Signaling through the TRAIL receptor DR5/FADD pathway plays a role in the apoptosis associated with skeletal myoblast differentiation. Apoptosis 2007; 11:2103-13. [PMID: 17041756 PMCID: PMC2782111 DOI: 10.1007/s10495-006-0196-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Apoptosis rather than differentiation is a physiological process during myogenesis and muscle regeneration. When cultured myoblasts were induced to differentiate, we detected an increase in caspase 8 activity. Pharmacological inhibition of caspase 8 activity decreased apoptosis. Expression of a dominant-negative mutant of the adapter protein FADD also abrogated apoptosis, implicating a death ligand pathway. Treatment with TRAIL, but not Fas, induced apoptosis in these myoblasts. Accordingly, treatment with a soluble TRAIL decoy receptor or expression of a dominant-negative mutant of the TRAIL receptor DR5 abrogated apoptosis. While TRAIL expression levels remained unaltered in apoptotic myoblasts, DR5 expression levels increased. Finally, we also detected a reduction in FLIP, a death-receptor effector protein and caspase 8 competitive inhibitor, to undetectable levels in apoptotic myoblasts. Thus, our data demonstrate an important role for the TRAIL/DR5/FADD/caspase 8 pathway in the apoptosis associated with skeletal myoblast differentiation. Identifying the functional apoptotic pathways in skeletal myoblasts may prove useful in minimizing the myoblast apoptosis that contributes pathologically to a variety of diseases and in minimizing the apoptosis of transplanted myoblasts to treat these and other disease states.
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Affiliation(s)
- J. O’Flaherty
- Department of Biological, Geological, and Environmental Sciences, Cleveland State University, Cleveland, OH 44115
| | - Y. Mei
- Department of Biological, Geological, and Environmental Sciences, Cleveland State University, Cleveland, OH 44115
| | - M. Freer
- Department of Biological, Geological, and Environmental Sciences, Cleveland State University, Cleveland, OH 44115
| | - C. M. Weyman
- Department of Biological, Geological, and Environmental Sciences, Cleveland State University, Cleveland, OH 44115
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17
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Hunter AL, Zhang J, Chen SC, Si X, Wong B, Ekhterae D, Luo H, Granville DJ. Apoptosis repressor with caspase recruitment domain (ARC) inhibits myogenic differentiation. FEBS Lett 2007; 581:879-84. [PMID: 17292893 DOI: 10.1016/j.febslet.2007.01.050] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2006] [Revised: 01/15/2007] [Accepted: 01/22/2007] [Indexed: 10/23/2022]
Abstract
Apoptosis repressor with caspase recruitment domain (ARC), an anti-apoptotic protein, is highly expressed in differentiated heart and skeletal muscle. Apoptosis and differentiation share numerous common pathways; therefore, we examined the impact of ARC on H9c2-myoblast differentiation. We demonstrate that ARC expression levels increase and stabilize upon differentiation. ARC-overexpression in pre-differentiated H9c2-cells suppresses differentiation; indicated by increased myotube formation, nuclear fusion and expression of the differentiation markers myogenin and troponin-T. ARC-overexpression inhibited myoblast differentiation associated caspase-3 activation, suggesting ARC inhibits myogenic differentiation through caspase inhibition. In summary, we show a novel role for ARC in the regulation of muscle differentiation.
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Affiliation(s)
- Arwen L Hunter
- James Hogg iCAPTURE Centre for Cardiovascular and Pulmonary Research, Department of Pathology and Laboratory Medicine, St. Paul's Hospital, University of British Columbia, 1081 Burrard Street, Vancouver, BC, Canada
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18
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Bakay M, Wang Z, Melcon G, Schiltz L, Xuan J, Zhao P, Sartorelli V, Seo J, Pegoraro E, Angelini C, Shneiderman B, Escolar D, Chen YW, Winokur ST, Pachman LM, Fan C, Mandler R, Nevo Y, Gordon E, Zhu Y, Dong Y, Wang Y, Hoffman EP. Nuclear envelope dystrophies show a transcriptional fingerprint suggesting disruption of Rb–MyoD pathways in muscle regeneration. Brain 2006; 129:996-1013. [PMID: 16478798 DOI: 10.1093/brain/awl023] [Citation(s) in RCA: 228] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Mutations of lamin A/C (LMNA) cause a wide range of human disorders, including progeria, lipodystrophy, neuropathies and autosomal dominant Emery-Dreifuss muscular dystrophy (EDMD). EDMD is also caused by X-linked recessive loss-of-function mutations of emerin, another component of the inner nuclear lamina that directly interacts with LMNA. One model for disease pathogenesis of LMNA and emerin mutations is cell-specific perturbations of the mRNA transcriptome in terminally differentiated cells. To test this model, we studied 125 human muscle biopsies from 13 diagnostic groups (125 U133A, 125 U133B microarrays), including EDMD patients with LMNA and emerin mutations. A Visual and Statistical Data Analyzer (VISDA) algorithm was used to statistically model cluster hierarchy, resulting in a tree of phenotypic classifications. Validations of the diagnostic tree included permutations of U133A and U133B arrays, and use of two probe set algorithms (MAS5.0 and MBEI). This showed that the two nuclear envelope defects (EDMD LMNA, EDMD emerin) were highly related disorders and were also related to fascioscapulohumeral muscular dystrophy (FSHD). FSHD has recently been hypothesized to involve abnormal interactions of chromatin with the nuclear envelope. To identify disease-specific transcripts for EDMD, we applied a leave-one-out (LOO) cross-validation approach using LMNA patient muscle as a test data set, with reverse transcription-polymerase chain reaction (RT-PCR) validations in both LMNA and emerin patient muscle. A high proportion of top-ranked and validated transcripts were components of the same transcriptional regulatory pathway involving Rb1 and MyoD during muscle regeneration (CRI-1, CREBBP, Nap1L1, ECREBBP/p300), where each was specifically upregulated in EDMD. Using a muscle regeneration time series (27 time points) we develop a transcriptional model for downstream consequences of LMNA and emerin mutations. We propose that key interactions between the nuclear envelope and Rb and MyoD fail in EDMD at the point of myoblast exit from the cell cycle, leading to poorly coordinated phosphorylation and acetylation steps. Our data is consistent with mutations of nuclear lamina components leading to destabilization of the transcriptome in differentiated cells.
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Affiliation(s)
- Marina Bakay
- Research Center for Genetic Medicine, Children's National Medical Center, Washington DC 20010, USA
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19
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Vaccarello G, Figliola R, Cramerotti S, Novelli F, Maione R. p57Kip2 is Induced by MyoD Through a p73-dependent Pathway. J Mol Biol 2006; 356:578-88. [PMID: 16405903 DOI: 10.1016/j.jmb.2005.12.024] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2005] [Revised: 12/05/2005] [Accepted: 12/08/2005] [Indexed: 12/31/2022]
Abstract
The cyclin-dependent-kinase inhibitors p21 and p57 are highly expressed in skeletal muscle where they redundantly control cell cycle arrest during differentiation. We have previously shown that p57 is a target of the myogenic factor MyoD in cells lacking p21. Here we show that MyoD induces p57 at the transcriptional level through a mechanism different from that involved in p21 regulation, since it is E-box-independent and requires new synthesized protein(s). We have identified p73 family members as the factors that mediate the activation of p57 through a 165bp promoter region. The levels of p73 alpha, beta and delta isoforms increase during muscle differentiation both in MyoD-expressing fibroblasts and in spontaneously differentiating C2 myoblasts. Moreover, the expression of a p73 dominant negative mutant interferes with the induction of p57. Finally, each of the isoforms up-regulated by MyoD, even when over-expressed alone, is capable of inducing p57 in p21-lacking fibroblasts. In contrast, the same p73 isoforms, either induced by MyoD or exogenously over-expressed, are unable to activate the expression of p57 in p21-expressing fibroblasts. Our finding that a transfected p57 promoter-reporter construct, unlike the endogenous gene, is responsive to both MyoD and p73 even in these cells, suggests that a cis-acting mechanism, probably involving a repressive chromatin structure, prevents the induction of p57 in p21-expressing fibroblasts.
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Affiliation(s)
- Giovanna Vaccarello
- Istituto Pasteur-Fondazione Cenci Bolognetti, Dipartimento di Biotecnologie Cellulari ed Ematologia, Sezione di Genetica Molecolare, Università di Roma La Sapienza, Viale Regina Elena 324, 00161 Roma, Italy
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20
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Relaix F, Montarras D, Zaffran S, Gayraud-Morel B, Rocancourt D, Tajbakhsh S, Mansouri A, Cumano A, Buckingham M. Pax3 and Pax7 have distinct and overlapping functions in adult muscle progenitor cells. ACTA ACUST UNITED AC 2005; 172:91-102. [PMID: 16380438 PMCID: PMC2063537 DOI: 10.1083/jcb.200508044] [Citation(s) in RCA: 497] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The growth and repair of skeletal muscle after birth depends on satellite cells that are characterized by the expression of Pax7. We show that Pax3, the paralogue of Pax7, is also present in both quiescent and activated satellite cells in many skeletal muscles. Dominant-negative forms of both Pax3 and -7 repress MyoD, but do not interfere with the expression of the other myogenic determination factor, Myf5, which, together with Pax3/7, regulates the myogenic differentiation of these cells. In Pax7 mutants, satellite cells are progressively lost in both Pax3-expressing and -nonexpressing muscles. We show that this is caused by satellite cell death, with effects on the cell cycle. Manipulation of the dominant-negative forms of these factors in satellite cell cultures demonstrates that Pax3 cannot replace the antiapoptotic function of Pax7. These findings underline the importance of cell survival in controlling the stem cell populations of adult tissues and demonstrate a role for upstream factors in this context.
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Affiliation(s)
- Frédéric Relaix
- Unité de Génétique Moléculaire du Développement, Centre National de la Recherche Scientifique URA 2578, Département de Biologie du Développement
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21
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Ghanem L, Steinman R. A proapoptotic function of p21 in differentiating granulocytes. Leuk Res 2005; 29:1315-23. [PMID: 15893818 DOI: 10.1016/j.leukres.2005.03.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2005] [Revised: 03/25/2005] [Accepted: 03/29/2005] [Indexed: 11/19/2022]
Abstract
p21(waf 1/cip 1) (p21), best known for its ability to regulate the cell cycle, has been noted also to exert cell cycle-independent effects on apoptosis and differentiation. Inhibition of apoptosis by p21 has been reported in hematopoietic models, particularly in monocytes exposed to apoptogenic agents. The effect of p21 on survival has not hitherto been analyzed during the myeloblast to granulocyte transition. Using 32 Dc l3 murine myeloblasts, a cell line that proliferates in IL-3 and differentiates in G-CSF, we studied the effects of forced expression of p21 on cell survival. We hypothesized that exogenous p21 would suppress the modest levels of cell death associated with G-CSF-mediated differentiation of 32 Dc l3 cells. Contrary to expectations, we found that exogenous p21 enhanced apoptosis of cells removed from IL-3. The p21 overexpression led to decreased cell growth, caspase-3 activation and annexin positivity. These effects occurred only in the presence of G-CSF. These findings suggest that p21 is proapoptotic in granulopoiesis, and that this effect is masked by IL-3-mediated survival signals. Our results also indicate there are distinct and opposing effects of p21 on monocytic and granulocytic survival. Aberrantly high levels of p21 may contribute to disease processes involving excessive apoptosis of granulocyte precursors.
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Affiliation(s)
- Louis Ghanem
- University of Pittsburgh School of Medicine, Department of Medicine, Hillman Cancer Center, Lab 2.18, 5117 Center Avenue, Pittsburgh, PA 15213, USA
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22
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Liu K, Lei XZ, Zhao LS, Tang H, Liu L, Feng P, Lei BJ. Tissue microarray for high-throughput analysis of gene expression profiles in hepatocellular carcinoma. World J Gastroenterol 2005; 11:1369-72. [PMID: 15761978 PMCID: PMC4250687 DOI: 10.3748/wjg.v11.i9.1369] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To study the expression profiles of HBsAg, HBcAg, p21WAF1/CIP1 (p21), Rb genes in hepatocellular carcinoma (HCC) and to investigate their roles in the hepatocar-cinogenesis.
METHODS: HCC tissue microarray containing 120-min tissues of 40 HCC cases was constructed. HBsAg, HBcAg, p21 and Rb proteins were immunohistochemically stained by streptavidin-peroxidase conjugated method (S-P). The expression loss of these genes in cancerous, para-cancerous tissues and adjacent normal liver tissues of 40 HCCs were comparatively examined.
RESULTS: The positive rate of HBsAg expression in cancerous tissues of 40 HCCs was 7.5%, which was lower than that in para-cancerous and adjacent normal liver tissues (χ2 =12.774, P<0.01; χ2 = 18.442, P<0.01). The positive rate of HBcAg expression in cancerous tissues of 40 HCCs was 20.0%, which was also lower than that in para-cancerous and adjacent normal liver tissues (χ2 = 9.482, P<0.01; χ2 = 14.645, P<0.01). p21 protein deletion rate in cancerous tissues of 40 HCCs was 27.5%, which was higher than that in para-cancerous and adjacent normal liver tissues (χ2 = 7.439, P<0.01; χ2 = 11.174, P<0.01). p21 protein deletion correlated remarkably with the pathological grade of HCC (χ2 = 0.072, P<0.05). Rb protein deletion rate in cancerous tissues of 40 HCCs was 42.5%, which was also higher than that in para-cancerous and adjacent normal liver tissues (χ2 = 10.551, P<0.01; χ2 = 18.353, P<0.01). Rb protein deletion rate did not correlate remarkably with tumor size or pathological grade of HCC (χ2 = 0.014, P>0.05; χ2 = 0.017, P>0.05).
CONCLUSION: Expression deletion of HBsAg, HBcAg, p21 and Rb proteins in HCCs may play important roles in the carcinogenesis of HCC. Tissue microarray is an effective high-throughput technique platform for cancer research.
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Affiliation(s)
- Kai Liu
- Division of Molecular Biology of Infectious Diseases, Key Laboratory of Biotherapy of Human Disease, Ministry of Education, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
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23
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Huh MS, Parker MH, Scimè A, Parks R, Rudnicki MA. Rb is required for progression through myogenic differentiation but not maintenance of terminal differentiation. ACTA ACUST UNITED AC 2004; 166:865-76. [PMID: 15364961 PMCID: PMC2172111 DOI: 10.1083/jcb.200403004] [Citation(s) in RCA: 124] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
To investigate the requirement for pRb in myogenic differentiation, a floxed Rb allele was deleted either in proliferating myoblasts or after differentiation. Myf5-Cre mice, lacking pRb in myoblasts, died immediately at birth and exhibited high numbers of apoptotic nuclei and an almost complete absence of myofibers. In contrast, MCK-Cre mice, lacking pRb in differentiated fibers, were viable and exhibited a normal muscle phenotype and ability to regenerate. Induction of differentiation of Rb-deficient primary myoblasts resulted in high rates of apoptosis and a total inability to form multinucleated myotubes. Upon induction of differentiation, Rb-deficient myoblasts up-regulated myogenin, an immediate early marker of differentiation, but failed to down-regulate Pax7 and exhibited growth in low serum conditions. Primary myoblasts in which Rb was deleted after expression of differentiated MCK-Cre formed normal multinucleated myotubes that did not enter S-phase in response to serum stimulation. Therefore, Rb plays a crucial role in the switch from proliferation to differentiation rather than maintenance of the terminally differentiated state.
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Affiliation(s)
- Michael S Huh
- Molecular Medicine Program, Ottawa Health Research Institute, Ottawa, Ontario, Canada, K1H 8L6.
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24
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Wolfraim LA, Walz TM, James Z, Fernandez T, Letterio JJ. p21Cip1 and p27Kip1 act in synergy to alter the sensitivity of naive T cells to TGF-beta-mediated G1 arrest through modulation of IL-2 responsiveness. THE JOURNAL OF IMMUNOLOGY 2004; 173:3093-102. [PMID: 15322169 DOI: 10.4049/jimmunol.173.5.3093] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Induction of G(1) arrest by TGF-beta correlates with the regulation of p21(Cip1) and p27(Kip1), members of the Cip/Kip family of cyclin-dependent kinase inhibitors (cki). However, no definitive evidence exists that these proteins play a causal role in TGF-beta(1)-induced growth arrest in lymphocytes. In this report we show the suppression of cell cycle progression by TGF-beta is diminished in T cells from mice deficient for both p21(Cip1) and p27(Kip1) (double-knockout (DKO)) only when activated under conditions of optimal costimulation. Although there is an IL-2-dependent enhanced proliferation of CD8(+) T cells from DKO mice, TGF-beta is able to maximally suppress the proliferation of DKO T cells when activated under conditions of low costimulatory strength. We also show that the induction of p15(Ink4b) in T cells stimulated in the presence of TGF-beta is not essential, as TGF-beta also efficiently suppressed proliferation of T cells from p15(Ink4b-/-) mice. Finally, although these cki are dispensable for the suppression of T cell proliferation by TGF-beta, we now describe a Smad3-dependent down-regulation of cdk4, suggesting a potential mechanism underlying to resistance of Smad3(-/-) T cells to the induction of growth arrest by TGF-beta. In summary, the growth suppressive effects of TGF-beta in naive T cells are a function of the strength of costimulation, and alterations in the expression of cki modify the sensitivity to TGF-beta by lowering thresholds for a maximal mitogenic response.
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Affiliation(s)
- Lawrence A Wolfraim
- Laboratory of Cell Regulation and Carcinogenesis, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
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25
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Figliola R, Maione R. MyoD induces the expression of p57Kip2 in cells lacking p21Cip1/Waf1: overlapping and distinct functions of the two cdk inhibitors. J Cell Physiol 2004; 200:468-75. [PMID: 15254975 DOI: 10.1002/jcp.20044] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The myogenic factor MyoD induces the expression of the cdk inhibitor p21 to promote cell cycle withdrawal in differentiating myoblasts. Although the cdk inhibitor p57 is also highly expressed in skeletal muscle and is thought to redundantly control myogenesis, little is known about its regulation, that has been suggested to be independent of MyoD. Here we show, for the first time, that MyoD is capable to induce the expression of p57. Intriguingly, this ability is restricted to cells lacking p21, suggesting that the two cdk inhibitors may be expressed in different muscle cell lineages. We also suggest that the functions of p21 and p57 in myoblast cells are only in part redundant. In fact, while the two cdk inhibitors play a similar role in cells undergoing G1 arrest during MyoD-induced differentiation, p57 does not replace p21 in cells escaping G1 arrest and undergoing MyoD-induced apoptosis. This difference can be ascribed both to a different subcellular localization and to a differential ability of the two cdk inhibitors to interact with cell cycle regulators.
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Affiliation(s)
- Rocco Figliola
- Istituto Pasteur-Fondazione Cenci Bolognetti, Dipartimento di Biotecnologie Cellulari ed Ematologia, Sezione di Genetica Molecolare, Università di Roma La Sapienza, Viale Regina Elena, Roma, Italy
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26
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Rodolosse A, Chalaux E, Adell T, Hagège H, Skoudy A, Real FX. PTF1alpha/p48 transcription factor couples proliferation and differentiation in the exocrine pancreas [corrected]. Gastroenterology 2004; 127:937-49. [PMID: 15362048 DOI: 10.1053/j.gastro.2004.06.058] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
BACKGROUND & AIMS The basic helix-loop-helix transcription factor pancreas-specific transcription factor 1alpha (PTF1alpha)/p48 is critical for committing cells to a pancreatic fate and for the maintenance of the differentiated state in acinar cells. The aim was to analyze the ability of p48 to modulate cell proliferation, its relationship with cell differentiation, and the mechanisms involved therein. METHODS Pancreatic and nonpancreatic cells were transfected with p48 cDNA, and the effects on cell proliferation were examined. The effects on cell cycle regulators were analyzed by Western blotting and RT-PCR; transient transfection assays were used to analyze promoter regulation. RESULTS p48 Inhibited proliferation of acinar and nonacinar cells by inducing a delay in G1-S progression through the up-regulation of p21 CIP1/WAF1 and p27 KIP1 and the down-regulation of cyclin D2. A 2-fold increase in p21 CIP1/WAF1 mRNA and in the activity of the p21 CIP1/WAF1 promoter was observed. The growth inhibition action of p48 was not associated with exocrine differentiation or with apoptosis. The antiproliferative effects were dependent on the COOH-terminal region of p48 and did not require the bHLH domain. Loss of p48 expression occurring during acinar-to-ductal transitions, characteristic of chronic pancreatitis, was associated with an increase of cell proliferation in ductal complexes. CONCLUSIONS The results indicate that p48 couples cell proliferation and cell differentiation in the exocrine pancreas, thus contributing to tissue homeostasis. These effects may play a role in the increased risk for pancreatic cancer associated with chronic pancreatitis.
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Affiliation(s)
- Annie Rodolosse
- Unitat de Biologia Cellular i Molecular, Institut Municipal d'Investigació Mèdica, Barcelona, Spain
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27
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Chopin V, Slomianny C, Hondermarck H, Le Bourhis X. Synergistic induction of apoptosis in breast cancer cells by cotreatment with butyrate and TNF-alpha, TRAIL, or anti-Fas agonist antibody involves enhancement of death receptors' signaling and requires P21waf1. Exp Cell Res 2004; 298:560-73. [PMID: 15265702 DOI: 10.1016/j.yexcr.2004.04.038] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2003] [Revised: 03/22/2004] [Indexed: 10/26/2022]
Abstract
Inhibitors of histone deacetylase (HDAC) are considered as potential anticancer agents. We have previously demonstrated that an inhibitor of HDAC, sodium butyrate (NaB), induces apoptosis of breast cancer cells in a P53-independent and P21(waf1)-dependent manner. In this study, we showed that tumor necrosis factor-alpha (TNF-alpha), TNF-related apoptosis-inducing ligand (TRAIL), and anti-Fas agonist antibody potentiated NaB-induced growth inhibition through synergistic induction of apoptosis in breast cancer cell lines (MCF-7, T47-D, and BT-20). In MCF-7 cells, NaB increased the expression of death receptors; NaB alone or in combination with TNF-alpha, TRAIL, and anti-Fas agonist antibody increased the levels of Bid, tBid, and that of cytosolic cytochrome c. Synergistic induction of apoptosis was strongly inhibited by dominant-negative Fas-associated death domain (FADD) and inhibitors of caspases-8 and -9, indicating that potentiation of apoptosis involved key elements of death receptors' signaling pathways. Moreover, cotreatment of NaB and ligands of death receptors up-regulated the levels of P21(waf1) and that of proliferating cell nuclear antigen (PCNA) associated with P21(waf1). Transient transfections of p21(waf1) antisense or p21(waf1) deficient for its interaction with PCNA abolished synergistic induction of apoptosis. This suggested that potentiation of apoptosis by cotreatments required P21(waf1) and its interaction with PCNA. Since breast tumors contain rarely p21 mutations, our results may open interesting prospects in the fight against breast cancer.
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Affiliation(s)
- V Chopin
- Laboratoire de Biologie du Développement, UPRES-EA 1033, IFR-118, Université des Sciences et Technologies de Lille, Bâtiment SN3, 59655 Villeneuve d'Ascq Cedex, France
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28
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Nguyen DX, Baglia LA, Huang SM, Baker CM, McCance DJ. Acetylation regulates the differentiation-specific functions of the retinoblastoma protein. EMBO J 2004; 23:1609-18. [PMID: 15044952 PMCID: PMC391080 DOI: 10.1038/sj.emboj.7600176] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2003] [Accepted: 02/25/2004] [Indexed: 11/08/2022] Open
Abstract
The retinoblastoma tumor-suppressor protein (pRb) is known to induce growth arrest and cellular differentiation. The molecular determinants of pRb function include protein-protein interactions and post-translational modifications such as phosphorylation. Recently, the co-activator p300 was found to acetylate pRb. The biological significance of pRb acetylation, however, remains unclear. In the present study, we provide evidence that pRb undergoes acetylation upon cellular differentiation, including skeletal myogenesis. In addition to p300, the p300-Associated Factor (P/CAF) can mediate pRb acetylation as pRb interacts directly with the acetyltransferase domain of P/CAF in vitro and can associate with P/CAF in differentiated cells. Significantly, by using a C terminal acetylation-impaired mutant of pRb, we reveal that acetylation does not affect pRb-dependent growth arrest or the repression of E2F transcriptional activity. Instead, acetylation is required for pRb-mediated terminal cell cycle exit and the induction of late myogenic gene expression. Based on these results, we propose that acetylation regulates the differentiation-specific function(s) of pRb.
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Affiliation(s)
- Don X Nguyen
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY, USA
| | - Laurel A Baglia
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY, USA
| | - Shih-Min Huang
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY, USA
| | - Christina M Baker
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY, USA
| | - Dennis J McCance
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY, USA
- The Cancer Center, University of Rochester, Rochester, NY, USA
- School of Medicine and Dentistry, University of Rochester, 601 Elmwood Avenue, Box 672, Rochester, NY 14642, USA. Tel.: +1 585 275 0101; Fax: +1 585 473 9573; E-mail: ,
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29
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Favreau C, Higuet D, Courvalin JC, Buendia B. Expression of a mutant lamin A that causes Emery-Dreifuss muscular dystrophy inhibits in vitro differentiation of C2C12 myoblasts. Mol Cell Biol 2004; 24:1481-92. [PMID: 14749366 PMCID: PMC344177 DOI: 10.1128/mcb.24.4.1481-1492.2004] [Citation(s) in RCA: 118] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Autosomal dominantly inherited missense mutations in lamins A and C cause several tissue-specific diseases, including Emery-Dreifuss muscular dystrophy (EDMD) and Dunnigan-type familial partial lipodystrophy (FPLD). Here we analyze myoblast-to-myotube differentiation in C2C12 clones overexpressing lamin A mutated at arginine 453 (R453W), one of the most frequent mutations in EDMD. In contrast with clones expressing wild-type lamin A, these clones differentiate poorly or not at all, do not exit the cell cycle properly, and are extensively committed to apoptosis. These disorders are correlated with low levels of expression of transcription factor myogenin and with the persistence of a large pool of hyperphosphorylated retinoblastoma protein. Since clones mutated at arginine 482 (a site responsible for FPLD) differentiate normally, we conclude that C2C12 clones expressing R453W-mutated lamin A represent a good cellular model to study the pathophysiology of EDMD. Our hypothesis is that lamin A mutated at arginine 453 fails to build a functional scaffold and/or to maintain the chromatin compartmentation required for differentiation of myoblasts into myocytes.
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Affiliation(s)
- Catherine Favreau
- Département de Biologie Cellulaire, Institut Jacques Monod, CNRS, Universités Paris 6 & 7, 75251 Paris cedex 05, France
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Chopin V, Toillon RA, Jouy N, Le Bourhis X. P21(WAF1/CIP1) is dispensable for G1 arrest, but indispensable for apoptosis induced by sodium butyrate in MCF-7 breast cancer cells. Oncogene 2004; 23:21-9. [PMID: 14712207 DOI: 10.1038/sj.onc.1207020] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Sodium butyrate (NaB) has been proposed as a potential anticancer agent. However, its mechanism of action is not totally elucidated. Here, we showed that NaB-induced cell cycle arrest and apoptosis were associated with an increase of P21(waf1/cip1) in MCF-7 breast cancer cells. This increase was more important in the nuclei, as revealed by immunofluorescence analysis. Transient transfections of MCF-7 cells with p21 deficient for interaction with CDK, but not with p21 deficient for interaction with PCNA (p21PCNA-), abrogated NaB-induced cell cycle arrest. This indicated that cell cycle blockage involved the interaction of P21(waf1/cip1) with CDK. However, P21(waf1/cip1) was dispensable, since p21 antisense did not modify cell cycle arrest. On the other hand, NaB-induced apoptosis was abolished by p21 antisense or p21PCNA-. In addition, NaB decreased PCNA levels, but increased the association of PCNA with P21(waf1/cip1). These results suggested that NaB-induced apoptosis required P21(waf1/cip1) and its interaction with PCNA.
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Affiliation(s)
- Valérie Chopin
- Equipe facteurs de croissance, Laboratoire de Biologie du Développement (UPRES 1033), IFR 118, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq Cedex 59655, France
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Liu S, Bishop WR, Liu M. Differential effects of cell cycle regulatory protein p21(WAF1/Cip1) on apoptosis and sensitivity to cancer chemotherapy. Drug Resist Updat 2003; 6:183-95. [PMID: 12962684 DOI: 10.1016/s1368-7646(03)00044-x] [Citation(s) in RCA: 131] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
p21(WAF1/Cip1) was initially identified as a cell cycle regulatory protein that can cause cell cycle arrest. It is induced by both p53-dependent and p53-independent mechanisms. This mini-review briefly discusses its currently known functions in apoptosis and drug sensitivity. As an inhibitor of cell proliferation, p21(WAF1/Cip1) plays an important role in drug-induced tumor suppression. Nevertheless, a number of recent studies have shown that p21(WAF1/Cip1) can assume both pro- or anti-apoptotic functions in response to anti-tumor agents depending on cell type and cellular context. This dual role of p21(WAF1/Cip1) in cancer cells complicates using p21(WAF1/Cip1) status to predict response to anti-tumor agents. However, it is possible to develop p21(WAF1/Cip1)-targeted reagents or p21(WAF1/Cip1) gene transfer techniques to have a beneficial effect within a well-defined therapeutic context. Better understanding of the roles of p21(WAF1/Cip1) in tumors should enable a more rational approach to anti-tumor drug design and therapy.
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Affiliation(s)
- Suxing Liu
- Biological Research-Oncology, Schering-Plough Research Institute, 2015 Galloping Hill Road, Kenilworth, NJ 07033, USA.
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