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Vauthier V, Lasserre A, Morel M, Versapuech M, Berlioz-Torrent C, Zamborlini A, Margottin-Goguet F, Matkovic R. HUSH-mediated HIV silencing is independent of TASOR phosphorylation on threonine 819. Retrovirology 2022; 19:23. [PMID: 36309692 PMCID: PMC9618200 DOI: 10.1186/s12977-022-00610-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 10/16/2022] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND TASOR, a component of the HUSH repressor epigenetic complex, and SAMHD1, a cellular triphosphohydrolase (dNTPase), are both anti-HIV proteins antagonized by HIV-2/SIVsmm Viral protein X. As a result, the same viral protein is able to relieve two different blocks along the viral life cell cycle, one at the level of reverse transcription, by degrading SAMHD1, the other one at the level of proviral expression, by degrading TASOR. Phosphorylation of SAMHD1 at T592 has been shown to downregulate its antiviral activity. The discovery that T819 in TASOR was lying within a SAMHD1 T592-like motif led us to ask whether TASOR is phosphorylated on this residue and whether this post-translational modification could regulate its repressive activity. RESULTS Using a specific anti-phospho-antibody, we found that TASOR is phosphorylated at T819, especially in cells arrested in early mitosis by nocodazole. We provide evidence that the phosphorylation is conducted by a Cyclin/CDK1 complex, like that of SAMHD1 at T592. While we could not detect TASOR in quiescent CD4 + T cells, TASOR and its phosphorylated form are present in activated primary CD4 + T lymphocytes. In addition, TASOR phosphorylation appears to be independent from TASOR repressive activity. Indeed, on the one hand, nocodazole barely reactivates HIV-1 in the J-Lat A1 HIV-1 latency model despite TASOR T819 phosphorylation. On the other hand, etoposide, a second cell cycle arresting drug, reactivates latent HIV-1, without concomitant TASOR phosphorylation. Furthermore, overexpression of wt TASOR or T819A or T819E similarly represses gene expression driven by an HIV-1-derived LTR promoter. Finally, while TASOR is degraded by HIV-2 Vpx, TASOR phosphorylation is prevented by HIV-1 Vpr, likely as a consequence of HIV-1 Vpr-mediated-G2 arrest. CONCLUSIONS Altogether, we show that TASOR phosphorylation occurs in vivo on T819. This event does not appear to correlate with TASOR-mediated HIV-1 silencing. We speculate that TASOR phosphorylation is related to a role of TASOR during cell cycle progression.
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Affiliation(s)
- Virginie Vauthier
- Université Paris Cité, CNRS, INSERM, Institut Cochin, 22 Rue Méchain, 75014, Paris, France
| | - Angélique Lasserre
- Université Paris Cité, CNRS, INSERM, Institut Cochin, 22 Rue Méchain, 75014, Paris, France
| | - Marina Morel
- Université Paris Cité, CNRS, INSERM, Institut Cochin, 22 Rue Méchain, 75014, Paris, France
| | - Margaux Versapuech
- Université Paris Cité, CNRS, INSERM, Institut Cochin, 22 Rue Méchain, 75014, Paris, France
| | | | - Alessia Zamborlini
- Center for Immunology of Viral, Auto-Immune, Hematological and Bacterial Diseases, Université Paris-Saclay, Inserm, CEA, IMVA-HB/IDMIT), Fontenay-Aux-Roses, France
| | | | - Roy Matkovic
- Université Paris Cité, CNRS, INSERM, Institut Cochin, 22 Rue Méchain, 75014, Paris, France.
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Li T, Li N, Wang L, Li J, Zhang X. MPP8 Promotes Proliferation and Restrains Apoptosis in Osteosarcoma by Regulating p38αMAPK Pathway. Technol Cancer Res Treat 2021; 20:1533033821995272. [PMID: 33596786 PMCID: PMC7897825 DOI: 10.1177/1533033821995272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Osteosarcoma is the most common primary bone malignancy. We aim to investigate that role of M-phase phosphoprotein 8 (MPP8) on proliferation and apoptosis in osteosarcoma. Briefly, the current research reported an in vitro study investigating the role MPP8 in OS tumorigenesis. Consequently, we found that the MPP8 expression was upregulated in osteosarcoma tissues and in osteosarcoma cell lines. Interestingly, MPP8 knockdown via shRNA restrained the cell viability and proliferation of U2OS and Saos-2 cells. In addition, MPP8 knockdown promoted the apoptosis of U2OS and Saos-2 cells, while MPP8 overexpression promotes proliferation and inhibited the cell apoptosis of osteosarcoma cells. These results suggested that MPP8 may serve as a contributor for osteosarcoma growth and inhibition of MPP8 may help restrain the development of osteosarcoma. Importantly, we found that MPP8 overexpression suppressed the protein levels of HOXA5, p38αMAPK, increased cell proliferation and inhibited cell apoptosis, while co-transfection with HOXA5 overexpression suppressed the cell proliferation and increased cell apoptosis. These results indicated that MPP8 contributed to cell proliferation and the underlying mechanism might be involved with HOXA5/ p38αMAPK pathway.
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Affiliation(s)
- Tao Li
- Department of Orthopaedic Ward 3, Qinghai Provincial People's Hospital, Xining City, Qinghai Province, China
| | - Na Li
- Department of Neurology, Qinghai Provincial People's Hospital, Xining City, Qinghai Province, China
| | - Lei Wang
- Department of Orthopaedic Ward 3, Qinghai Provincial People's Hospital, Xining City, Qinghai Province, China
| | - Jia Li
- Department of Orthopaedic Ward 3, Qinghai Provincial People's Hospital, Xining City, Qinghai Province, China
| | - Xin Zhang
- Department of Orthopaedic Ward 3, Qinghai Provincial People's Hospital, Xining City, Qinghai Province, China
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Wang Y, Xiao H, Wang C, Wu H, He H, Yao C, Cui J, Li W. M-phase phosphoprotein 8 promotes gastric cancer growth and metastasis via p53/Bcl-2 and EMT-related signaling pathways. J Cell Biochem 2019; 121:2330-2342. [PMID: 31692032 DOI: 10.1002/jcb.29456] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 10/10/2019] [Indexed: 12/29/2022]
Abstract
BACKGROUND The main issue of this study is to demonstrate whether M-phase phosphoprotein 8 (MPP8) affect gastric tumor growth and metastasis. METHODS Retrospective study was proceeded in 280 patients' surgical specimens with different disease stages. Loss-of-function assays, including 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide, flow cytometry, and transwell assays were performed to evaluate the biological function of MPP8 in gastric cancer cells. Apoptosis and metastasis relative biomarkers were measured by quantitative real-time polymerase chain reaction and Western blot analysis. RESULTS Compared with normal adjacent tissues, obviously elevated MPP8 expression was found in gastric cancer tissues. Elevated MPP8 expression was associated with male sex (vs female sex), intermediate differentiation (vs poorly differentiated cancer), and later stage (vs earlier stage). Furthermore, MPP8 overexpression in tumor tissues was marginally associated with a poor prognosis, with a significant relationship between MPP8 overexpression and prognosis among patients with poorly differentiated gastric cancer. Inhibition of MPP8 in these cells significantly suppressed proliferation and colony formation, promoted apoptosis, and repressed invasion. Furthermore, silencing of MPP8 remarkably increased apoptosis-related proteins (p53, Bax, and PARP) expression, but downregulated Bcl-2 expression. Silencing of MPP8 also decreased the expression of metastasis pathway-related proteins (N-cadherin and vimentin), and as well as the levels of anti-oncogene ZEB1, MET, and KRAS mRNA. CONCLUSION Our findings demonstrated that MPP8 might be an oncogene by positively regulating gastric cancer cell function through the p53/Bcl-2 and epithelial to mesenchymal transition-related signaling pathways.
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Affiliation(s)
- Yizhuo Wang
- Department of Cancer Center, First Hospital of Jilin University, Changchun, China
| | - Huijie Xiao
- Department of Gastrointestinal Colorectal and Anal Surgery, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Chang Wang
- Department of Cancer Center, First Hospital of Jilin University, Changchun, China
| | - Haitao Wu
- Department of Cancer Center, First Hospital of Jilin University, Changchun, China
| | - Hua He
- Department of Cancer Center, First Hospital of Jilin University, Changchun, China
| | - Cheng Yao
- Department of Cancer Center, First Hospital of Jilin University, Changchun, China
| | - Jiuwei Cui
- Department of Cancer Center, First Hospital of Jilin University, Changchun, China
| | - Wei Li
- Department of Cancer Center, First Hospital of Jilin University, Changchun, China
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The H3K9 Methylation Writer SETDB1 and its Reader MPP8 Cooperate to Silence Satellite DNA Repeats in Mouse Embryonic Stem Cells. Genes (Basel) 2019; 10:genes10100750. [PMID: 31557926 PMCID: PMC6826936 DOI: 10.3390/genes10100750] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2019] [Revised: 09/15/2019] [Accepted: 09/24/2019] [Indexed: 12/28/2022] Open
Abstract
SETDB1 (SET Domain Bifurcated histone lysine methyltransferase 1) is a key lysine methyltransferase (KMT) required in embryonic stem cells (ESCs), where it silences transposable elements and DNA repeats via histone H3 lysine 9 tri-methylation (H3K9me3), independently of DNA methylation. The H3K9 methylation reader M-Phase Phosphoprotein 8 (MPP8) is highly expressed in ESCs and germline cells. Although evidence of a cooperation between H3K9 KMTs and MPP8 in committed cells has emerged, the interplay between H3K9 methylation writers and MPP8 in ESCs remains elusive. Here, we show that MPP8 interacts physically and functionally with SETDB1 in ESCs. Indeed, combining biochemical, transcriptomic and genomic analyses, we found that MPP8 and SETDB1 co-regulate a significant number of common genomic targets, especially the DNA satellite repeats. Together, our data point to a model in which the silencing of a class of repeated sequences in ESCs involves the cooperation between the H3K9 methylation writer SETDB1 and its reader MPP8.
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Liang X, Liu T, Zhang W, Zhang K, Guo S, Liang J. Lentivirus-mediated knockdown of M-phase phosphoprotein 8 inhibits proliferation of colon cancer cells. Biotechnol Appl Biochem 2017; 64:911-917. [PMID: 27174009 DOI: 10.1002/bab.1504] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 04/15/2016] [Accepted: 05/02/2016] [Indexed: 12/30/2022]
Abstract
M-phase phosphoprotein 8 (MPP8) has been reported to be overexpressed in various human carcinoma cells and was associated with tumor malignant characters. However, its functional role in colon cancer (CRC) is still unclear. In the present study, lentivirus-mediated short hairpin RNAs were designed to silence the MPP8 gene in CRC cells including RKO and SW1116 cells. The fluorescence microscopy was used to determine the knockdown efficiency of MPP8 by observing lentivirus-mediated green fluorescent protein expression. MPP8 expression in infected RKO and SW1116 was evaluated by real-time PCR and Western blot analysis. Cell proliferation was assessed by MTT assay and colony formation. Flow cytometry was applied to measure cell cycle and apoptosis. Transwell assay was used to determine the effect of MMP8 silencing on cell migration. Our results demonstrated that loss of MPP8 inhibited cell proliferation and migration and promoted cell apoptosis. These results indicate that MPP8 plays an important role in the proliferation and metastasis of CRC cells and suggest that silencing of MPP8 may be an effective therapeutic approach for the treatment of CRC.
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Affiliation(s)
- Xianjun Liang
- Department of Gastroenterology, Taizhou Central Hospital, Taizhou, People's Republic of China
| | - Tongjun Liu
- Department of Colorectal, Second Affiliated Hospital of Jilin University, Changchun, People's Republic of China
| | - Weizhong Zhang
- Department of Hand & Foot Surgery, China-Japan Union Hospital of Jilin University, Changchun, People's Republic of China
| | - Kai Zhang
- Department of Colorectal, Second Affiliated Hospital of Jilin University, Changchun, People's Republic of China
| | - Shuai Guo
- Department of Endocrinology, Taizhou Central Hospital, Taizhou, People's Republic of China
| | - Jianhua Liang
- Department of Gastroenterology, Taizhou Central Hospital, Taizhou, People's Republic of China
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Li P, Yang W, Shen B, Li H, Yan J. Lentivirus-mediated silencing of MPHOSPH8 inhibits MTC proliferation and enhances apoptosis. Oncol Lett 2016; 11:4117-4122. [PMID: 27313751 DOI: 10.3892/ol.2016.4545] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Accepted: 04/08/2016] [Indexed: 01/29/2023] Open
Abstract
Thyroid carcinoma (TC) is the most common malignancy of the endocrine organs, and its incidence rate has steadily increased over the last decade. For medullary thyroid cancer (MTC), a type of TC, a high mortality rate has been reported. In previous studies, M-phase phosphoprotein 8 (MPHOSPH8) displayed an elevated expression in various human carcinoma cells. Thus, MPHOSPH8 may be a sensitive biomarker that could be used for the diagnosis and follow-up of MTC. In the present study, plasmids of RNA interference targeting the MPHOSPH8 gene were constructed. Once these lentiviruses targeting MPHOSPH8 were transfected into the MTC cell line TT, cell viability and proliferation were measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Flow cytometry was used to assess the cell cycle distribution and apoptosis. The expression levels of MPHOSPH8 were detected by reverse transcription quantitative-polymerase chain reaction and western blot analyses. Depletion of MPHOSPH8 significantly inhibited cell proliferation. Furthermore, knockdown of MPHOSPH8 in TT cells led to G0/G1 phase cell cycle arrest and apoptosis. The results of the present study suggest that MPHOSPH8 promotes cell proliferation and may be a potential target for anticancer therapy of MTC.
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Affiliation(s)
- Peiyong Li
- Department of Nuclear Medicine, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
| | - Weiping Yang
- Department of Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
| | - Baiyong Shen
- Department of Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
| | - Hongwei Li
- Department of Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
| | - Jiqi Yan
- Department of Surgery, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, P.R. China
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Murata K, Sato S, Haruta M, Goshima T, Chiba Y, Takahashi S, Sharif J, Koseki H, Nakanishi M, Shimada M. Physical interaction between MPP8 and PRC1 complex and its implication for regulation of spermatogenesis. Biochem Biophys Res Commun 2015; 458:470-475. [PMID: 25660450 DOI: 10.1016/j.bbrc.2015.01.122] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Accepted: 01/25/2015] [Indexed: 12/16/2022]
Abstract
Epigenetic modifications such as DNA methylation and histone H3 lysine 27 methylation (H3K27me) are repressive marks that silence gene expression. The M phase phosphoprotein (MPP8) associates with proteins involved in both DNA methylation and histone modifications, and therefore, is a potential candidate to mediate crosstalk between repressive epigenetic pathways. Here, by performing immunohistochemical analyses we demonstrate that MPP8 is expressed in the rodent testis, especially in spermatocytes, suggesting a role in spermatogenesis. Interestingly, we found that MPP8 physically interacts with PRC1 (Polycomb Repressive Complex 1) components which are known to possess essential function in testis development by modulating monoubiquitination of Histone H2A (uH2A) and trimethylation of Histone H3 Lysine 27 (H3K27me3) residues. Knockdown analysis of MPP8 in HeLa cells resulted in derepression of a set of genes that are normally expressed in spermatogonia, spermatids and mature sperm, thereby indicating a role for this molecule in silencing testis-related genes in somatic cells. In addition, depletion of MPP8 in murine ES cells specifically induced expression of genes involved in mesoderm differentiation, such as Cdx2 and Brachyury even in the presence of LIF, which implicated that MPP8 might be required to repress differentiation associated genes during early development. Taken together, our results indicate that MPP8 could have a role for silencing genes that are associated with differentiation of the testis and the mesoderm by interacting with epigenetic repressors modules such as the PRC1 complex.
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Affiliation(s)
- Kazuhiro Murata
- Department of Cell Biology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Shinya Sato
- Experimental Pathology and Tumor Biology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Mayumi Haruta
- Department of Cell Biology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Takahiro Goshima
- Department of Cell Biology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Yoshie Chiba
- Department of Cell Biology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Satoru Takahashi
- Experimental Pathology and Tumor Biology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan
| | - Jafar Sharif
- Development Genetics Group, RIKEN Center for Integrative Medical Sciences (IMS), 1-7-22 Suehiuro-cho, Tsurumi, Yokohama, Kanagawa, 230-0045, Japan
| | - Haruhiko Koseki
- Development Genetics Group, RIKEN Center for Integrative Medical Sciences (IMS), 1-7-22 Suehiuro-cho, Tsurumi, Yokohama, Kanagawa, 230-0045, Japan
| | - Makoto Nakanishi
- Department of Cell Biology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan.
| | - Midori Shimada
- Department of Cell Biology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan.
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