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Niwa Y, Kamimura K, Ogawa K, Oda C, Tanaka Y, Horigome R, Ohtsuka M, Miura H, Fujisawa K, Yamamoto N, Takami T, Okuda S, Ko M, Owaki T, Kimura A, Shibata O, Morita S, Sakai N, Abe H, Yokoo T, Sakamaki A, Kamimura H, Terai S. Cyclin D1 Binding Protein 1 Responds to DNA Damage through the ATM–CHK2 Pathway. J Clin Med 2022; 11:jcm11030851. [PMID: 35160302 PMCID: PMC8836734 DOI: 10.3390/jcm11030851] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 01/30/2022] [Accepted: 02/01/2022] [Indexed: 12/14/2022] Open
Abstract
Cyclin D1 binding protein 1 (CCNDBP1) is considered a tumor suppressor, and when expressed in tumor cells, CCNDBP1 can contribute to the viability of cancer cells by rescuing these cells from chemotherapy-induced DNA damage. Therefore, this study focused on investigating the function of CCNDBP1, which is directly related to the survival of cancer cells by escaping DNA damage and chemoresistance. Hepatocellular carcinoma (HCC) cells and tissues obtained from Ccndbp1 knockout mice were used for the in vitro and in vivo examination of the molecular mechanisms of CCNDBP1 associated with the recovery of cells from DNA damage. Subsequently, gene and protein expression changes associated with the upregulation, downregulation, and irradiation of CCNDBP1 were assessed. The overexpression of CCNDBP1 in HCC cells stimulated cell growth and showed resistance to X-ray-induced DNA damage. Gene expression analysis of CCNDBP1-overexpressed cells and Ccndbp1 knockout mice revealed that Ccndbp1 activated the Atm–Chk2 pathway through the inhibition of Ezh2 expression, accounting for resistance to DNA damage. Our study demonstrated that by inhibiting EZH2, CCNDBP1 contributed to the activation of the ATM–CHK2 pathway to alleviate DNA damage, leading to chemoresistance.
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Affiliation(s)
- Yusuke Niwa
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Kenya Kamimura
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
- Department of General Medicine, Niigata University School of Medicine, Niigata 951-8510, Niigata, Japan
- Correspondence: ; Tel.: +81-(25)-227-2207
| | - Kohei Ogawa
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Chiyumi Oda
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Yuto Tanaka
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Ryoko Horigome
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Masato Ohtsuka
- Department of Molecular Life Science, Division of Basic Medical Science and Molecular Medicine, School of Medicine, Tokai University, Isehara 259-1193, Kanagawa, Japan; (M.O.); (H.M.)
| | - Hiromi Miura
- Department of Molecular Life Science, Division of Basic Medical Science and Molecular Medicine, School of Medicine, Tokai University, Isehara 259-1193, Kanagawa, Japan; (M.O.); (H.M.)
| | - Koichi Fujisawa
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube 755-8505, Yamaguchi, Japan; (K.F.); (N.Y.); (T.T.)
| | - Naoki Yamamoto
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube 755-8505, Yamaguchi, Japan; (K.F.); (N.Y.); (T.T.)
| | - Taro Takami
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Ube 755-8505, Yamaguchi, Japan; (K.F.); (N.Y.); (T.T.)
| | - Shujiro Okuda
- Division of Bioinformatics, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan;
| | - Masayoshi Ko
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Takashi Owaki
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Atsushi Kimura
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Osamu Shibata
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Shinichi Morita
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Norihiro Sakai
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Hiroyuki Abe
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Takeshi Yokoo
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Akira Sakamaki
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Hiroteru Kamimura
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
| | - Shuji Terai
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Niigata, Japan; (Y.N.); (K.O.); (C.O.); (Y.T.); (R.H.); (M.K.); (T.O.); (A.K.); (O.S.); (S.M.); (N.S.); (H.A.); (T.Y.); (A.S.); (H.K.); (S.T.)
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Yang L, Wu Z, Sun W, Luo P, Chen S, Chen Y, Yan W, Li Y, Wang C. CCNDBP1, a Prognostic Marker Regulated by DNA Methylation, Inhibits Aggressive Behavior in Dedifferentiated Liposarcoma via Repressing Epithelial Mesenchymal Transition. Front Oncol 2021; 11:687012. [PMID: 34631521 PMCID: PMC8493074 DOI: 10.3389/fonc.2021.687012] [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] [Received: 03/28/2021] [Accepted: 08/27/2021] [Indexed: 12/24/2022] Open
Abstract
The present study aimed to explore the prognostic value, function, and mechanism of CCNDBP1 in dedifferentiated liposarcoma (DDL). Immunohistochemistry staining was used to analyze the protein expression of CCNDBP1 in tissue specimens. After silencing CCNDBP1 in LPS853 and overexpressing CCNDBP1 in LPS510, CCK-8, clone formation, transwell migration, and invasion assays were used to detect cell proliferation, migration, and invasion ability. CCNDBP1-induced cell apoptosis was analyzed by flow cytometry. The altered expression of epithelial-mesenchymal transition (EMT)-related proteins were detected by Western blot. The methylation, gene expression, and clinical data of 58 samples with DDL were analyzed using the cancer genome atlas (TCGA) database. Low expression of CCNDBP1 was associated with a poor prognosis of patients with DDL and was considered an independent prognostic factor of the progression-free survival (PFS). CCNDBP1 significantly inhibited the clone formation, proliferation, migration, and invasion of cancer cells in vitro and promoted cancer cell apoptosis. CCNDBP1 could repress the pathological EMT, thereby inhibiting the malignant behaviors of DDL cells. The high degree of DNA methylation sites cg05194114 and cg22184989 could decrease the expression of CCNDBP1 and worsen the prognosis of DDL patients. This is the first study reporting that CCNDBP1 is a tumor suppressor gene of DDL and putative prognostic marker in DDL patients. CCNDBP1 might inhibit the ability of cell proliferation and invasion by repressing pathological EMT, and the expression of CCNDBP1 could be regulated by DNA methylation in DDL.
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Affiliation(s)
- Lingge Yang
- Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Zhiqiang Wu
- Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Wei Sun
- Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Peng Luo
- Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Shiqi Chen
- Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yong Chen
- Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Wangjun Yan
- Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yan Li
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
- Fudan University Shanghai Cancer Center, Key Laboratory of Medical Epigenetics and Metabolism, Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Chunmeng Wang
- Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
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Liang RY, Liu BH, Huang CJ, Lin KT, Ko CC, Huang LL, Hsu B, Wu CY, Chuang SM. MEK2 is a critical modulating mechanism to down-regulate GCIP stability and function in cancer cells. FASEB J 2019; 34:1958-1969. [PMID: 31907980 DOI: 10.1096/fj.201901911r] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 09/29/2019] [Accepted: 10/15/2019] [Indexed: 02/03/2023]
Abstract
Loss of tumor suppressor activity and upregulation of oncogenic pathways simultaneously contribute to tumorigenesis. Expression of the tumor suppressor, GCIP (Grap2- and cyclin D1-interacting protein), is usually reduced or lost in advanced cancers, as seen in both mouse tumor models and human cancer patients. However, no previous study has examined how cancer cells down-regulate GCIP expression. In this study, we first validate the tumor suppressive function of GCIP using clinical gastric cancer tissues and online database analysis. We then reveal a novel mechanism whereby MEK2 directly interacts with and phosphorylates GCIP at its Ser313 and Ser356 residues to promote the turnover of GCIP by ubiquitin-mediated proteasomal degradation. We also reveal that decreased GCIP stability enhances cell proliferation and promotes cancer cell migration and invasion. Taken together, these findings provide a more comprehensive view of GCIP in tumorigenesis and suggest that the oncogenic MEK/ERK signaling pathway negatively regulates the protein level of GCIP to promote cell proliferation and migration.
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Affiliation(s)
- Ruei-Yue Liang
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Bang-Hung Liu
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Chih-Jou Huang
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Kuan-Ting Lin
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Chih-Chung Ko
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Lin-Lun Huang
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Bin Hsu
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Chun-Ying Wu
- Division of Gastroenterology & Hepatology, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Show-Mei Chuang
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
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Hélias-Rodzewicz Z, Lourenco N, Bakari M, Capron C, Emile JF. CDKN2A Depletion Causes Aneuploidy and Enhances Cell Proliferation in Non-Immortalized Normal Human Cells. Cancer Invest 2018; 36:338-348. [PMID: 30136875 DOI: 10.1080/07357907.2018.1491588] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Aneuploidy is a common feature of cancer cells and may contribute to cellular transformation and cancer development. In this study, we found that significant down-regulation of CDKN2A, CHEK2, CDCA8, TP53BP1, and CCNDBP1 led to chromosome imbalances in two diploid non-immortalized human cell lines; however, only CDKN2A inhibition enhanced cell proliferation and additionally up-regulated three cell cycle control genes: CDCA8, AURKA, and CCND. These results confirm that CDKN2A is a tumor suppressor gene driving human cancer development by inducing cell aneuploidy and cell cycle up-regulation.
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Affiliation(s)
- Zofia Hélias-Rodzewicz
- a EA4340, UVSQ , Boulogne-Billancourt , France.,b Service de Pathologie, CHU Ambroise Paré , Boulogne-Billancourt , France
| | - Nelson Lourenco
- a EA4340, UVSQ , Boulogne-Billancourt , France.,c Service de Gastroenterologie, Hopital St Louis, APHP , Paris, France
| | | | - Claude Capron
- a EA4340, UVSQ , Boulogne-Billancourt , France.,d Service de Hématologie-Immunologie, CHU Ambroise Paré , Boulogne-Billancourt , France
| | - Jean-François Emile
- a EA4340, UVSQ , Boulogne-Billancourt , France.,b Service de Pathologie, CHU Ambroise Paré , Boulogne-Billancourt , France
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Zhu SW, Li JP, Ma XL, Ma JX, Yang Y, Chen Y, Liu W. miR-9 Modulates Osteosarcoma Cell Growth by Targeting the GCIP Tumor Suppressor. Asian Pac J Cancer Prev 2016; 16:4509-13. [PMID: 26107195 DOI: 10.7314/apjcp.2015.16.11.4509] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Osteosarcoma is the most common primary bone tumor in humans, especially in childhood. However, the genetic etiology for its pathogenesis remains elusive. It is known that microRNAs (miRNAs) are involved in the development of tumor progression. Here we show that microRNA-9 (miR-9) is a potential oncogene upregulated in osteosarcoma cells. Knockdown of miR-9 in osteosarcoma resulted in suppressed colony formation and cell proliferation. Further study identified GCIP, a Grap2 and cyclin D interacting protein, as a direct target of miR- 9. In addition, GCIP overexpression activated retinoblastoma 1 (Rb) and suppressed E2F transcriptional target expression in osteosarcoma cells. Moreover, GCIP depletion reversed miR-9 knockdown induced colony formation and cell proliferation suppression. In sum, these results highlight the importance of miR-9 as an oncogene in regulating the proliferation of osteosarcoma by directly targeting GCIP and may provide new insights into the pathogenesis of osteosarcoma.
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Affiliation(s)
- Shao-Wen Zhu
- Tianjin Medical University, Tianjin, China E-mail :
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Fujisawa K, Terai S, Matsumoto T, Takami T, Yamamoto N, Nishina H, Furutani-Seiki M, Sakaida I. Evidence for a Role of the Transcriptional Regulator Maid in Tumorigenesis and Aging. PLoS One 2015; 10:e0129950. [PMID: 26107180 PMCID: PMC4479567 DOI: 10.1371/journal.pone.0129950] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 05/14/2015] [Indexed: 01/06/2023] Open
Abstract
Maid is a helix-loop-helix protein that is involved in cell proliferation. In order to further elucidate its physiological functions, we studied Maid activity in two small fish model systems. We found that Maid expression was greatest in zebrafish liver and that it increased following partial hepatectomy. Maid levels were also high in hepatic preneoplastic foci induced by treatment of zebrafish with diethylnitrosamine (DEN), but low in hepatocellular carcinomas (HCC), mixed tumors, and cholangiocarcinomas developing in these animals. In DEN-treated transgenic medaka overexpressing Maid, hepatic BrdU uptake and proliferation were reduced. After successive breedings, Maid transgenic medaka exhibited decreased movement and a higher incidence of abnormal spine curvature, possibly due to the senescence of spinal cord cells. Taken together, our results suggest that Maid levels can influence the progression of liver cancer. In conclusion, we found that Maid is important regulator of hepatocarconogenesis and aging.
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Affiliation(s)
- Koichi Fujisawa
- Center for Reparative Medicine, Yamaguchi University School of Medicine, Minami Kogushi 1-1-1, Ube Yamaguchi 755–8505, Japan
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Minami Kogushi 1-1-1, Ube Yamaguchi 755–8505, Japan
| | - Shuji Terai
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Minami Kogushi 1-1-1, Ube Yamaguchi 755–8505, Japan
- Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, 1–757 Asahimachidori, Chuo-Ku, Niigata 951–8510, Japan
- * E-mail:
| | - Toshihiko Matsumoto
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Minami Kogushi 1-1-1, Ube Yamaguchi 755–8505, Japan
| | - Taro Takami
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Minami Kogushi 1-1-1, Ube Yamaguchi 755–8505, Japan
| | - Naoki Yamamoto
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Minami Kogushi 1-1-1, Ube Yamaguchi 755–8505, Japan
| | - Hiroshi Nishina
- Department of Developmental and Regenerative Biology, Medical Research Institute, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113–8510, Japan
| | - Makoto Furutani-Seiki
- Department of Biology and Biochemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Isao Sakaida
- Center for Reparative Medicine, Yamaguchi University School of Medicine, Minami Kogushi 1-1-1, Ube Yamaguchi 755–8505, Japan
- Department of Gastroenterology and Hepatology, Yamaguchi University Graduate School of Medicine, Minami Kogushi 1-1-1, Ube Yamaguchi 755–8505, Japan
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Motizuki M, Saitoh M, Miyazawa K. Maid is a negative regulator of transforming growth factor-β-induced cell migration. J Biochem 2015; 158:435-44. [PMID: 26002959 DOI: 10.1093/jb/mvv054] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 05/16/2015] [Indexed: 12/19/2022] Open
Abstract
Maternal Id-like molecule (Maid) is a dominant negative helix-loop-helix protein that has been implicated in regulating gene expression as well as cell-cycle progression. Overexpressed Maid was previously shown to inhibit certain cellular responses induced by transforming growth factor-β (TGF-β), such as TGF-β-induced cytostasis and cell motility, but not epithelial-mesenchymal transition (EMT). The role of endogenous Maid in regulating TGF-β signalling, however, has not been elucidated. We have found evidence that endogenous Maid negatively regulates TGF-β-induced cell motility. Maid knockdown enhanced TGF-β-induced cell motility as measured by chamber migration and wound healing assays but did not affect cell motility induced by bone morphogenetic protein (BMP)-4. Endogenous Maid does not appear to be involved in regulating TGF-β-induced cytostasis, resistance to apoptosis or EMT. Notably, Maid expression was induced in the delayed phase (later than 24 h) after TGF-β stimulation whereas the expression of two other negative feedback regulators, Smad7 and SnoN, was induced as early as 1 h after stimulation. These findings indicate that Maid is a unique negative feedback regulator of TGF-β signalling in its mode of action as well as the timing of its induction.
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Affiliation(s)
- Mitsuyoshi Motizuki
- Department of Biochemistry, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Yamanashi 409-3898, Japan
| | - Masao Saitoh
- Department of Biochemistry, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Yamanashi 409-3898, Japan
| | - Keiji Miyazawa
- Department of Biochemistry, Interdisciplinary Graduate School of Medicine, University of Yamanashi, Yamanashi 409-3898, Japan
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Chen KY, Chen CC, Tseng YL, Chang YC, Chang MC. GCIP functions as a tumor suppressor in non-small cell lung cancer by suppressing Id1-mediated tumor promotion. Oncotarget 2015; 5:5017-28. [PMID: 24970809 PMCID: PMC4148118 DOI: 10.18632/oncotarget.2075] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Grap2 and cyclin D1 interacting protein (GCIP) has been recognized as a putative tumor suppressor, but the molecular mechanisms underlying its anti-tumor properties remain undefined. Here, we report that GCIP is frequently downregulated in non-small cell lung cancer (NSCLC) tissues. Binding assays indicated that inhibitor of DNA binding/differentiation 1 (Id1) interacts with GCIP in the nucleus. Ectopic GCIP expression in the highly invasive NSCLC cell line, H1299, inhibited proliferation, colony formation, invasion and migration, and increased susceptibility to anticancer drugs. Conversely, silencing GCIP expression in the minimally invasive NSCLS cell line, A549, increased proliferation, colony formation, invasion, and migration in vitro, and increased survival and resistance to anticancer drugs. GCIP also suppresses tumorigenicity of NSCLC cells in vivo and GCIP suppresses NSCLC progression is mediated in part by interfering with Id1 signaling, which was confirmed in conditionally induced stable cell lines. In addition, GCIP downregulates the expression of Id1, and GCIP and Id1 are inversely expressed in NSCLC cell lines and specimens. Taken together, these results suggest that GCIP is a potential tumor suppressor in NSCLC and that suppression of Id1-mediated oncogenic properties may be a key mechanism by which GCIP can potently suppress NSCLC tumor progression.
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Affiliation(s)
- Kuan-yu Chen
- Institute of Biotechnology, National Cheng Kung University, Tainan, Taiwan
| | - Chao-chung Chen
- Department of Biotechnology, College of Medicine and Nursing, Hung Kuang University, Taichung, Tainan
| | - Yau-lin Tseng
- Department of Surgery, National Cheng Kung University Medical College and Hospital, Tainan, Taiwan
| | - Yi-chien Chang
- Department of Surgery, National Cheng Kung University Medical College and Hospital, Tainan, Taiwan
| | - Ming-chung Chang
- Institute of Biotechnology, National Cheng Kung University, Tainan, Taiwan. Department of Nutrition, College of Medicine and Nursing, Hung Kuang University, Taichung, Tainan
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Li L, Zhao F, Lu J, Li T, Yang H, Wu C, Liu Y. Notch-1 signaling promotes the malignant features of human breast cancer through NF-κB activation. PLoS One 2014; 9:e95912. [PMID: 24760075 PMCID: PMC3997497 DOI: 10.1371/journal.pone.0095912] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Accepted: 04/01/2014] [Indexed: 11/30/2022] Open
Abstract
The aberrant activation of Notch-1 signaling pathway has been proven to be associated with the development and progression of cancers. However, the specific roles and the underlying mechanisms of Notch-1 signaling pathway on the malignant behaviors of breast cancer are poorly understood. In this study, using multiple cellular and molecular approaches, we demonstrated that activation of Notch-1 signaling pathway promoted the malignant behaviors of MDA-MB-231 cells such as increased cell proliferation, colony formation, adhesion, migration, and invasion, and inhibited apoptosis; whereas deactivation of this signaling pathway led to the reversal of the aforementioned malignant cellular behaviors. Furthermore, we found that activation of Notch-1 signaling pathway triggered the activation of NF-κB signaling pathway and up-regulated the expression of NF-κB target genes including MMP-2/-9, VEGF, Survivin, Bcl-xL, and Cyclin D1. These results suggest that Notch-1 signaling pathway play important roles in promoting the malignant phenotype of breast cancer, which may be mediated partly through the activation of NF-κB signaling pathway. Our results further suggest that targeting Notch-1 signaling pathway may become a newer approach to halt the progression of breast cancer.
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Affiliation(s)
- Li Li
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, P.R. China
| | - Fenglong Zhao
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, P.R. China
| | - Juan Lu
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, P.R. China
| | - Tingting Li
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, P.R. China
| | - Hong Yang
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, P.R. China
| | - Chunhui Wu
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, P.R. China
| | - Yiyao Liu
- Department of Biophysics, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan, P.R. China
- * E-mail:
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10
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Structure of a dominant-negative helix-loop-helix transcriptional regulator suggests mechanisms of autoinhibition. EMBO J 2012; 31:2541-52. [PMID: 22453338 DOI: 10.1038/emboj.2012.77] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2011] [Accepted: 03/06/2012] [Indexed: 01/28/2023] Open
Abstract
Helix-loop-helix (HLH) family transcription factors regulate numerous developmental and homeostatic processes. Dominant-negative HLH (dnHLH) proteins lack DNA-binding ability and capture basic HLH (bHLH) transcription factors to inhibit cellular differentiation and enhance cell proliferation and motility, thus participating in patho-physiological processes. We report the first structure of a free-standing human dnHLH protein, HHM (Human homologue of murine maternal Id-like molecule). HHM adopts a V-shaped conformation, with N-terminal and C-terminal five-helix bundles connected by the HLH region. In striking contrast to the common HLH, the HLH region in HHM is extended, with its hydrophobic dimerization interfaces embedded in the N- and C-terminal helix bundles. Biochemical and physicochemical analyses revealed that HHM exists in slow equilibrium between this V-shaped form and the partially unfolded, relaxed form. The latter form is readily available for interactions with its target bHLH transcription factors. Mutations disrupting the interactions in the V-shaped form compromised the target transcription factor specificity and accelerated myogenic cell differentiation. Therefore, the V-shaped form of HHM may represent an autoinhibited state, and the dynamic conformational equilibrium may control the target specificity.
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11
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Lee I, Yeom SY, Lee SJ, Kang WK, Park C. A novel senescence-evasion mechanism involving Grap2 and Cyclin D interacting protein inactivation by Ras associated with diabetes in cancer cells under doxorubicin treatment. Cancer Res 2010; 70:4357-65. [PMID: 20460530 DOI: 10.1158/0008-5472.can-09-3791] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Ras associated with diabetes (Rad) is a Ras-related GTPase that promotes cell growth by accelerating cell cycle transitions. Rad knockdown induced cell cycle arrest and premature senescence without additional cellular stress in multiple cancer cell lines, indicating that Rad expression might be critical for the cell cycle in these cells. To investigate the precise function of Rad in this process, we used human Rad as bait in a yeast two-hybrid screening system and sought Rad-interacting proteins. We identified the Grap2 and cyclin D interacting protein (GCIP)/DIP1/CCNDBP1/HHM, a cell cycle-inhibitory molecule, as a binding partner of Rad. Further analyses revealed that Rad binds directly to GCIP in vitro and coimmunoprecipitates with GCIP from cell lysates. Rad translocates GCIP from the nucleus to the cytoplasm, thereby inhibiting the tumor suppressor activity of GCIP, which occurs in the nucleus. Furthermore, in the presence of Rad, GCIP loses its ability to reduce retinoblastoma phosphorylation and inhibit cyclin D1 activity. The function of Rad in transformation is also evidenced by increased telomerase activity and colony formation according to Rad expression level. In vivo tumorigenesis analyses revealed that tumors derived from Rad knockdown cells were significantly smaller than those from control cells (P = 0.0131) and the preestablished tumors are reduced in size after the injection of siRad (P = 0.0064). Therefore, we propose for the first time that Rad may promote carcinogenesis at least in part by inhibiting GCIP-mediated tumor suppression.
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Affiliation(s)
- Inkyoung Lee
- Biomedical Research Institute, Samsung Medical Center and Department of Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea
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12
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Wu Y, Wang YY, Nakamoto Y, Li YY, Baba T, Kaneko S, Fujii C, Mukaida N. Accelerated hepatocellular carcinoma development in mice expressing the Pim-3 transgene selectively in the liver. Oncogene 2010; 29:2228-37. [PMID: 20101231 DOI: 10.1038/onc.2009.504] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Pim-3, a proto-oncogene with serine/threonine kinase activity, was enhanced in hepatocellular carcinoma (HCC) tissues. To address the roles of Pim-3 in HCC development, we prepared transgenic mice that express human Pim-3 selectively in liver. The mice were born at a Mendelian ratio, were fertile and did not exhibit any apparent pathological changes in the liver until 1 year after birth. Pim-3-transgenic mouse-derived hepatocytes exhibited accelerated cell cycle progression. The administration of a potent hepatocarcinogen, diethylnitrosamine (DEN), induced accelerated proliferation of liver cells in Pim-3 transgenic mice in the early phase, compared with that observed for wild-type mice. Treatment with DEN induced lipid droplet accumulation with increased proliferating cell numbers 6 months after the treatment. Eventually, wild-type mice developed HCC with a frequency of 40% until 10 month after the treatment. Lipid accumulation was accelerated in Pim-3 transgenic mice with higher proliferating cell numbers, compared with that observed for wild-type mice. Pim-3 transgenic mice developed HCC with a higher incidence (80%) and a heavier burden, together with enhanced intratumoral CD31-positive vascular areas, compared with that observed for wild-type mice. These observations indicate that Pim-3 alone cannot cause, but can accelerate HCC development when induced by a hepatocarcinogen, such as DEN.
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Affiliation(s)
- Y Wu
- Department of Hematology and Hematology research Laboratory, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan Province, PR China
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13
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Oudejans JJ, van Wieringen WN, Smeets SJ, Tijssen M, Vosse SJ, Meijer CJLM, Meijer GA, van de Wiel MA, Ylstra B. Identification of genes putatively involved in the pathogenesis of diffuse large B-cell lymphomas by integrative genomics. Genes Chromosomes Cancer 2009; 48:250-60. [PMID: 19051311 DOI: 10.1002/gcc.20632] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Diffuse large B-cell lymphomas (DLBCL) are highly heterogeneous with regard to clinical presentation and outcome. DLBCL copy number aberrations have been identified previously, of which the deletion at 6q21-24 was significantly associated with a highly favorable clinical response to chemotherapy. In this study, we aimed to identify genes implicated in this and other genomic regions with recurrent losses and/or gains. To identify implicated genes, we superimposed array comparative genomic hybridization (aCGH) data onto a microarray expression dataset of 42 clinically well-characterized primary nodal DLBCL biopsies. We confirmed that loss of 6q21-24 is significantly associated with a highly favorable clinical response to chemotherapy. Our approach identified 316 significant genes restricted to 32 chromosomal regions, including 24 genes identified at 6q21-24. In an independent dataset, 18% of overexpressed genes in gained regions and 55% of down-regulated genes in deleted regions were validated. In summary, using integrative genomics novel onco and tumor suppressor genes were identified in DLBCL that were not recognized by expression profiling alone.
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Affiliation(s)
- Joost J Oudejans
- Department of Pathology, VU University Medical Center, 1007 MB Amsterdam, The Netherlands
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14
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Chen WC, Su PF, Jin YT, Chang MC, Chang TW. Immunohistochemical expression of GCIP in breast carcinoma: relationship with tumour grade, disease-free survival, mucinous differentiation and response to chemotherapy. Histopathology 2009; 53:554-60. [PMID: 18983464 DOI: 10.1111/j.1365-2559.2008.03154.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS Grap2 and cyclin-D interacting protein (GCIP) is a putative tumour suppressor in human cancer. The aim was to investigate its prognostic significance in human breast carcinoma. METHODS AND RESULTS Immunohistochemical analysis of breast carcinoma specimens from 107 female patients was performed. Decreased cytoplasmic expression of GCIP was detected in breast carcinomas compared with normal ductal epithelium (P < 0.001). Higher GCIP scores were observed in patients with lower histological grade, mucinous carcinomas and better clinical outcome (P < 0.05). Disease-free survival was significantly longer in patients with high GCIP scores than in those with low GCIP scores (P = 0.010). However, GCIP expression was independent of the status of oestrogen receptor, progesterone receptor, Her-2/neu and cancer stage. Moreover, in patients receiving neoadjuvant chemotherapy, those with higher GCIP scores showed potentially more reduction of tumour size compared with those with lower GCIP scores (borderline significance, P = 0.053). CONCLUSIONS The current data provide evidence that decreased expression of GCIP in vivo is present in human breast carcinoma and indicate that GCIP is a potential indicator of good prognosis. In patients receiving neoadjuvant chemotherapy, it may also have predictive value for the chemotherapeutic response.
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Affiliation(s)
- W-C Chen
- Department of Pathology, National Cheng Kung University Medical College and Hospital, National Cheng Kung University, Tainan, Taiwan
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15
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Seto A, Ikushima H, Suzuki T, Sato Y, Fukai S, Yuki K, Miyazawa K, Miyazono K, Ishitani R, Nureki O. Crystallization and preliminary X-ray diffraction analysis of GCIP/HHM transcriptional regulator. Acta Crystallogr Sect F Struct Biol Cryst Commun 2008; 65:21-4. [PMID: 19153449 DOI: 10.1107/s1744309108038219] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Accepted: 11/18/2008] [Indexed: 11/10/2022]
Abstract
GCIP/HHM is a human nuclear protein that is implicated in regulation of cell proliferation. Its primary structure contains helix-loop-helix and leucine-zipper motifs but lacks a DNA-binding basic region. Native and selenomethionine-derivatized (SeMet) crystals of full-length GCIP/HHM were obtained using the hanging-drop vapour-diffusion method. The crystals were greatly improved by adding tris(2-carboxyethyl)phosphine as a reducing reagent and diffracted to 3.5 A resolution. Preliminary phase calculations using the data set obtained from the SeMet crystal suggested that the crystal belonged to space group P3(2)21 and contained one molecule per asymmetric unit. Structure determination by the multiple-wavelength anomalous dispersion method using the SeMet crystals is in progress.
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Affiliation(s)
- Azusa Seto
- Department of Biological Information, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama-shi, Kanagawa, Japan
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16
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A novel mouse model of hepatocarcinogenesis triggered by AID causing deleterious p53 mutations. Oncogene 2008; 28:469-78. [PMID: 18997814 DOI: 10.1038/onc.2008.415] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Activation-induced cytidine deaminase (AID), the only enzyme that is known to be able to induce mutations in the human genome, is required for somatic hypermutation and class-switch recombination in B lymphocytes. Recently, we showed that AID is implicated in the pathogenesis of human cancers including hepatitis C virus (HCV)-induced human hepatocellular carcinoma (HCC). In this study, we established a new AID transgenic mouse model (TNAP-AID) in which AID is expressed in cells producing tissue-nonspecific alkaline phosphatase (TNAP), which is a marker of primordial germ cells and immature stem cells, including ES cells. High expression of TNAP was found in the liver of the embryos and adults of TNAP-AID mice. HCC developed in 27% of these mice at the age of approximately 90 weeks. The HCC that developed in TNAP-AID mice expressed alpha-fetoprotein and had deleterious mutations in the tumour suppressor gene Trp53, some of which corresponded to those found in human cancer. In conclusion, TNAP-AID is a mouse model that spontaneously develops HCC, sharing genetic and phenotypic features with human HCC, which develops in the inflamed liver as a result of the accumulation of genetic changes.
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17
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Ikushima H, Komuro A, Isogaya K, Shinozaki M, Hellman U, Miyazawa K, Miyazono K. An Id-like molecule, HHM, is a synexpression group-restricted regulator of TGF-beta signalling. EMBO J 2008; 27:2955-65. [PMID: 18923419 PMCID: PMC2570476 DOI: 10.1038/emboj.2008.218] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2008] [Accepted: 09/19/2008] [Indexed: 02/02/2023] Open
Abstract
Transforming growth factor (TGF)-β induces various cellular responses principally through Smad-dependent transcriptional regulation. Activated Smad complexes cooperate with transcription factors in regulating a group of target genes. The target genes controlled by the same Smad-cofactor complexes are denoted a synexpression group. We found that an Id-like helix-loop-helix protein, human homologue of Maid (HHM), is a synexpression group-restricted regulator of TGF-β signalling. HHM suppressed TGF-β-induced growth inhibition and cell migration but not epithelial–mesenchymal transition. In addition, HHM inhibited TGF-β-induced expression of plasminogen activator inhibitor-type 1 (PAI-1), PDGF-B, and p21WAF, but not Snail. We identified a basic-helix-loop-helix protein, Olig1, as one of the Smad-binding transcription factors affected by HHM. Olig1 interacted with Smad2/3 in response to TGF-β stimulation, and was involved in transcriptional activation of PAI-1 and PDGF-B. HHM, but not Id proteins, inhibited TGF-β signalling-dependent association of Olig1 with Smad2/3 through physical interaction with Olig1. HHM thus appears to regulate a subset of TGF-β target genes including the Olig1-Smad synexpression group. HHM is the first example of a cellular response-selective regulator of TGF-β signalling with clearly determined mechanisms.
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Affiliation(s)
- Hiroaki Ikushima
- Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
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18
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Ma W, Stafford LJ, Li D, Luo J, Li X, Ning G, Liu M. GCIP/CCNDBP1, a helix-loop-helix protein, suppresses tumorigenesis. J Cell Biochem 2007; 100:1376-86. [PMID: 17131381 DOI: 10.1002/jcb.21140] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Deletions and/or loss of heterozygosity (LOH) on chromosome 15 (15q15 and 15q21) have been found in several human tumors, including carcinomas of the colorectum, breast, lung, prostate, and bladder, suggesting the presence of potential tumor suppressor gene(s) in this particular region of chromosome 15. GCIP also called CCNDBP1, DIP1, or HHM, localized at chromosome 15q15, is a recently identified helix-loop-helix leucine zipper (HLH-ZIP) protein without a basic region like the Id family of proteins. In this study, we reported that the expression of GCIP was significantly downregulated in several different human tumors, including breast tumor, prostate tumor, and colon tumors. In human colon tumors, both mRNA and protein expression levels of GCIP were decreased significantly compared to the normal tissues. Treatment of colon cancer cells SW480 with sodium butyrate (NaB), which induces colon cancer cell differentiation, can induce the upregulation of GCIP expression, suggesting that the protein functions as a negative regulator in cell proliferation. Overexpression of GCIP in SW480 colon cancer cell line resulted in a significant inhibition on tumor cell colony formation, while silencing of GCIP expression by siRNA can promote cell colony formation. Furthermore, overexpression of GCIP inhibited the transcriptional activity of cyclin D1 promoter and the expression of cyclin D1 protein in the cell. Finally, we demonstrate that GCIP specifically interacts with one of the class III HDAC proteins, SirT6, which is important for maintaining genome stability. Together, our data suggest a possible function of GCIP in tumor suppression.
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Affiliation(s)
- Wenbin Ma
- Institute of Biosciences and Technology, and Department of Molecular and Cellular Medicine, Texas A and M University System Health Science Center, Houston, Texas 77030, USA
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Chang TW, Chen CC, Chen KY, Su JH, Chang JH, Chang MC. Ribosomal phosphoprotein P0 interacts with GCIP and overexpression of P0 is associated with cellular proliferation in breast and liver carcinoma cells. Oncogene 2007; 27:332-8. [PMID: 17621266 DOI: 10.1038/sj.onc.1210651] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The ribosomal acidic P0 protein, an essential component of the eukaryotic ribosomal stalk, was found to interact with the helix-loop-helix protein human Grap2 and cyclin D interacting protein (GCIP)/D-type cyclin-interacting protein 1/human homolog of MAID protein. Using in vivo and in vitro binding assays, we show that P0 can interact with the N and C termini of GCIP via its N-terminal 39-114 amino-acid residues. Although the P0-GCIP complex was detected mainly in cytoplasmic fraction, polysome profile analysis indicated that the P0-GCIP complex did not coelute with either polysomes or 60S ribosomes, suggesting that GCIP associates with the free form of P0 in the cytoplasm. Transfection of GCIP into MCF-7 cells resulted in decreased levels of pRb phosphorylation. Cotransfection of P0 with GCIP, however, resulted in GCIP-mediated reduction of pRb phosphorylation level which was repressed by P0. Furthermore, overexpression of P0 in breast cancer and hepatocellular cancer cell lines promoted cell growth and colony formation compared to control transfectants. Overexpression of P0 also increased cyclin D1 expression and phosphorylation of pRb at Ser780. Interestingly, P0 mRNA was overexpressed in 12 of 20 pairs of breast cancer/ normal breast specimens (60%). Together, these data indicate that P0 overexpression may cause tumorigenesis in breast and liver tissues at least in part by inhibiting GCIP-mediated tumor suppression.
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Affiliation(s)
- T-W Chang
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
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Chellas-Géry B, Linton CN, Fields KA. Human GCIP interacts with CT847, a novel Chlamydia trachomatis type III secretion substrate, and is degraded in a tissue-culture infection model. Cell Microbiol 2007; 9:2417-30. [PMID: 17532760 DOI: 10.1111/j.1462-5822.2007.00970.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The obligate intracellular bacterium Chlamydia trachomatis occupies a parasitophorous vacuole and employs a type III secretion mechanism to translocate host-interactive proteins. These proteins most likely contribute to pathogenesis through modulation of host cell mechanisms crucial for the establishment and maintenance of a permissive intracellular environment. Using a surrogate Yersinia type III secretion system (T3SS), we have identified the conserved gene product CT847 as a chlamydial T3SS substrate. Yeast two-hybrid studies using CT847 as bait to screen a HeLa cell cDNA library identified an interaction with mammalian Grap2 cyclin D-interacting protein (GCIP). Immunoblot analyses of C. trachomatis-infected HeLa cells showed that GCIP levels begin to decrease (as compared with mock-infected HeLa cells) between 8 h and 12 h post infection. GCIP was virtually undetectable in 24 h time point material. This decrease was inhibited by proteasome inhibitors lactacystin and MG-132, and the T3SS inhibitor Compound 1. CT847 was detectible in purified reticulate body but not elementary body lysates, and reverse transcription polymerase chain reaction (RT-PCR) expression analyses indicate a mid-cycle expression pattern. Both of these findings are consistent with CT847 contributing to the observed effect on GCIP. Given the established roles of GCIP, we believe that we have discovered a novel C. trachomatis antihost protein whose activity is relevant to chlamydial pathogenesis.
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Affiliation(s)
- Blandine Chellas-Géry
- Department of Microbiology and Immunology, University of Miami Miller School of Medicine, Miami, FL 33101, USA
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Sonnenberg-Riethmacher E, Wüstefeld T, Miehe M, Trautwein C, Riethmacher D. Maid (GCIP) is involved in cell cycle control of hepatocytes. Hepatology 2007; 45:404-11. [PMID: 17256742 DOI: 10.1002/hep.21461] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
UNLABELLED The function of Maid (GCIP), a cyclinD-binding helix-loop-helix protein, was analyzed by targeted disruption in mice. We show that Maid function is not required for normal embryonic development. However, older Maid-deficient mice-in contrast to wild-type controls--develop hepatocellular carcinomas. Therefore, we studied the role of Maid during cell cycle progression after partial hepatectomy (PH). Lack of Maid expression after PH was associated with a delay in G1/S-phase progression as evidenced by delayed cyclinA expression and DNA replication in Maid-deficient mice. However, at later time points liver mass was restored normally. CONCLUSION These results indicate that Maid is involved in G1/S-phase progression of hepatocytes, which in older animals is associated with the development of liver tumors.
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