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Cicirò Y, Ragusa D, Sala A. Expression of the checkpoint kinase BUB1 is a predictor of response to cancer therapies. Sci Rep 2024; 14:4461. [PMID: 38396175 PMCID: PMC10891059 DOI: 10.1038/s41598-024-55080-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 02/19/2024] [Indexed: 02/25/2024] Open
Abstract
The identification of clinically-relevant biomarkers is of upmost importance for the management of cancer, from diagnosis to treatment choices. We performed a pan-cancer analysis of the mitotic checkpoint budding uninhibited by benzimidazole 1 gene BUB1, in the attempt to ascertain its diagnostic and prognostic values, specifically in the context of drug response. BUB1 was found to be overexpressed in the majority of cancers, and particularly elevated in clinically aggressive molecular subtypes. Its expression was correlated with clinico-phenotypic features, notably tumour staging, size, invasion, hypoxia, and stemness. In terms of prognostic value, the expression of BUB1 bore differential clinical outcomes depending on the treatment administered in TCGA cancer cohorts, suggesting sensitivity or resistance, depending on the expression levels. We also integrated in vitro drug sensitivity data from public projects based on correlation between drug efficacy and BUB1 expression to produce a list of candidate compounds with differential responses according to BUB1 levels. Gene Ontology enrichment analyses revealed that BUB1 overexpression in cancer is associated with biological processes related to mitosis and chromosome segregation machinery, reflecting the mechanisms of action of drugs with a differential effect based on BUB1 expression.
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Affiliation(s)
- Ylenia Cicirò
- Centre for Inflammation Research and Translational Medicine (CIRTM), Brunel University London, Uxbridge, UB8 3PH, UK
| | - Denise Ragusa
- Centre for Genome Engineering and Maintenance (CenGEM), Brunel University London, Uxbridge, UB8 3PH, UK.
| | - Arturo Sala
- Centre for Inflammation Research and Translational Medicine (CIRTM), Brunel University London, Uxbridge, UB8 3PH, UK.
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Xiong M, Chen X, Wang H, Tang X, Wang Q, Li X, Ma H, Ye X. Combining transcriptomics and network pharmacology to reveal the mechanism of Zuojin capsule improving spasmolytic polypeptide-expressing metaplasia. JOURNAL OF ETHNOPHARMACOLOGY 2024; 318:117075. [PMID: 37625606 DOI: 10.1016/j.jep.2023.117075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 08/12/2023] [Accepted: 08/21/2023] [Indexed: 08/27/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Spasmolytic polypeptide-expressing metaplasia (SPEM) is a gastric precancerous lesion (GPL). Zuojin capsule (ZJC), consisting of Coptis chinensis Franch. (Ranunculaceae, recorded in the Chinese Pharmacopoeia as Rhizoma Coptidis) and Tetradium ruticarpum (A.Juss.) T.G.Hartley (Rutaceae, recorded in the Chinese Pharmacopoeia as Fructus Evodiae), has long been used for various gastrointestinal diseases. However, the effect and mechanism of ZJC on SPEM remain unclear. AIM OF THE STUDY To clarify the role of ZJC in improving SPEM and study its mechanism. MATERIALS AND METHODS The study utilized SPEM mice induced by 250 mg/kg body weight of tamoxifen (TAM) to assess the effects of ZJC and investigate its possible mechanisms. A strategy of transcriptomics combined with network pharmacology was conducted to explore the targets and mechanisms of ZJC in improving SPEM. The "ingredients-target-pathway" network was constructed, and the possible connections were verified by RT-qPCR and Western blot assays. RESULTS ZJC significantly attenuated the abnormal serological indices, destruction of the gastric mucosal structure, hyperplasia of gastric pits, increased gastric mucus, massive secretion of CD44 and TFF2, oxyntic atrophy and massive proliferation of stem/progenitor cells in TAM-induced SPEM mice. Combined transcriptomics and network pharmacology analysis, 50 core targets of ZJC related to SPEM improvement were obtained. KEGG results showed that the core targets were significantly enriched in the cell cycle, and PI3K-AKT signaling pathway. The top-ranked targets according to PPI network analysis were CDK1, CCNB1, and CCNA2, which are also associated with cell cycle. Combined experiments demonstrated that ZJC can induce G2/M phase cycle arrest and inhibit TAM-induced malignant proliferation by regulating abnormal activation of cell cycle-related proteins such as CDK1, CCNB1, CCNA2 and PI3K-AKT signaling pathways. CONCLUSIONS ZJC may improve TAM-induced SPEM by inhibiting abnormal activation of cell cycle-related proteins (CDK1, CCNB1, CCNA2) and PI3K-AKT signaling pathway. This finding supports the use of ZJC, a famous traditional Chinese medicine compound, as a potential treatment for gastric precancerous lesions.
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Affiliation(s)
- Mengyuan Xiong
- Engineering Research Center of Coptis Development and Utilization (Ministry of Education), School of Life Sciences, Southwest University, Chongqing, 400715, China.
| | - Xiantao Chen
- Engineering Research Center of Coptis Development and Utilization (Ministry of Education), School of Life Sciences, Southwest University, Chongqing, 400715, China.
| | - Hongmei Wang
- Engineering Research Center of Coptis Development and Utilization (Ministry of Education), School of Life Sciences, Southwest University, Chongqing, 400715, China.
| | - Xiang Tang
- Engineering Research Center of Coptis Development and Utilization (Ministry of Education), School of Life Sciences, Southwest University, Chongqing, 400715, China.
| | - Qiaojiao Wang
- Engineering Research Center of Coptis Development and Utilization (Ministry of Education), School of Life Sciences, Southwest University, Chongqing, 400715, China.
| | - Xuegang Li
- College of Pharmaceutical Sciences, Southwest University, Chongqing, 400715, China.
| | - Hang Ma
- College of Pharmaceutical Sciences, Southwest University, Chongqing, 400715, China.
| | - Xiaoli Ye
- Engineering Research Center of Coptis Development and Utilization (Ministry of Education), School of Life Sciences, Southwest University, Chongqing, 400715, China.
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Chen R, Wang Z, Lu T, Liu Y, Ji Y, Yu Y, Tou F, Guo S. Budding uninhibited by benzimidazoles 1 overexpression is associated with poor prognosis and malignant phenotype: A promising therapeutic target for lung adenocarcinoma. Thorac Cancer 2023; 14:893-912. [PMID: 36825773 PMCID: PMC10067360 DOI: 10.1111/1759-7714.14822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/03/2023] [Accepted: 02/06/2023] [Indexed: 02/25/2023] Open
Abstract
BACKGROUND The budding uninhibited by benzimidazoles (BUB) family is involved in the cell cycle process as mitotic checkpoint components. Abnormal proliferation is a vital process in the development of lung adenocarcinoma (LUAD). Nevertheless, the roles of BUB1 in LUAD remain unclear. In this study, we evaluated the prognostic value and biological functions of BUB1 in LUAD using data from The Cancer Genome Atlas (TCGA), Gene Expression Omnibus (GEO), clinical LUAD samples, and in vitro experiments. METHODS The expression, prognostic significance, functions, immune infiltration, and methylation of BUB1 in LUAD were comprehensively analyzed using TCGA, GEO, Gene Expression Profiling Interactive Analysis, Metascape, cBioPortal, MethSurv, and cancerSEA databases. Furthermore, we performed a battery of in vitro experiments and immunohistochemistry (IHC) to verify the bioinformatics results. RESULTS Multivariate analysis revealed that BUB1 overexpression was an independent prognostic factor (hazard ratio = 1.499, p = 0.013). Functional enrichment analysis showed that BUB1 was correlated with cell cycle, proliferation, DNA repair, DNA damage, and invasion (p < 0.05). Finally, in vitro experiments showed that downregulation of BUB1 inhibited the proliferation, migration, and invasion of LUAD cells and promoted LUAD cell apoptosis. IHC also showed that BUB1 was overexpressed in LUAD (p < 0.001) and was significantly associated with poor prognosis (p < 0.001). CONCLUSIONS Our bioinformatics and IHC analyses revealed that BUB1 overexpression was an adverse prognostic factor in LUAD. In vitro experiments demonstrated that BUB1 promoted tumor cell proliferation, migration, and invasion in LUAD. These results indicated that BUB1 was a promising biomarker and potential therapeutic target in LUAD.
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Affiliation(s)
- Rui Chen
- Graduate School, Medical College of Nanchang University, Nanchang, China.,Jiangxi Key Laboratory of Translational Research for Cancer, Jiangxi Clinical Research Center for Cancer, Jiangxi Cancer Hospital, The Second Affiliated Hospital of Nanchang Medical College, Nanchang, China
| | | | - Tianzhu Lu
- Jiangxi Key Laboratory of Translational Research for Cancer, Jiangxi Clinical Research Center for Cancer, Jiangxi Cancer Hospital, The Second Affiliated Hospital of Nanchang Medical College, Nanchang, China
| | - Yuzhen Liu
- Graduate School, Medical College of Nanchang University, Nanchang, China.,Jiangxi Key Laboratory of Translational Research for Cancer, Jiangxi Clinical Research Center for Cancer, Jiangxi Cancer Hospital, The Second Affiliated Hospital of Nanchang Medical College, Nanchang, China
| | - Yulong Ji
- Jiangxi Key Laboratory of Translational Research for Cancer, Jiangxi Clinical Research Center for Cancer, Jiangxi Cancer Hospital, The Second Affiliated Hospital of Nanchang Medical College, Nanchang, China
| | - Yilin Yu
- Fujian Medical University, Fuzhou, China
| | - Fangfang Tou
- Graduate School, Medical College of Nanchang University, Nanchang, China.,Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, Nanchang, China
| | - Shanxian Guo
- Graduate School, Medical College of Nanchang University, Nanchang, China.,Jiangxi Key Laboratory of Translational Research for Cancer, Jiangxi Clinical Research Center for Cancer, Jiangxi Cancer Hospital, The Second Affiliated Hospital of Nanchang Medical College, Nanchang, China
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Xiao Y, Dong J. The Hippo Signaling Pathway in Cancer: A Cell Cycle Perspective. Cancers (Basel) 2021; 13:cancers13246214. [PMID: 34944834 PMCID: PMC8699626 DOI: 10.3390/cancers13246214] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/07/2021] [Accepted: 12/08/2021] [Indexed: 01/25/2023] Open
Abstract
Simple Summary Cancer is increasingly viewed as a cell cycle disease in that the dysregulation of the cell cycle machinery is a common feature in cancer. The Hippo signaling pathway consists of a core kinase cascade as well as extended regulators, which together control organ size and tissue homeostasis. The aberrant expression of cell cycle regulators and/or Hippo pathway components contributes to cancer development, and for this reason, we specifically focus on delineating the roles of the Hippo pathway in the cell cycle. Improving our understanding of the Hippo pathway from a cell cycle perspective could be used as a powerful weapon in the cancer battlefield. Abstract Cell cycle progression is an elaborate process that requires stringent control for normal cellular function. Defects in cell cycle control, however, contribute to genomic instability and have become a characteristic phenomenon in cancers. Over the years, advancement in the understanding of disrupted cell cycle regulation in tumors has led to the development of powerful anti-cancer drugs. Therefore, an in-depth exploration of cell cycle dysregulation in cancers could provide therapeutic avenues for cancer treatment. The Hippo pathway is an evolutionarily conserved regulator network that controls organ size, and its dysregulation is implicated in various types of cancers. Although the role of the Hippo pathway in oncogenesis has been widely investigated, its role in cell cycle regulation has not been comprehensively scrutinized. Here, we specifically focus on delineating the involvement of the Hippo pathway in cell cycle regulation. To that end, we first compare the structural as well as functional conservation of the core Hippo pathway in yeasts, flies, and mammals. Then, we detail the multi-faceted aspects in which the core components of the mammalian Hippo pathway and their regulators affect the cell cycle, particularly with regard to the regulation of E2F activity, the G1 tetraploidy checkpoint, DNA synthesis, DNA damage checkpoint, centrosome dynamics, and mitosis. Finally, we briefly discuss how a collective understanding of cell cycle regulation and the Hippo pathway could be weaponized in combating cancer.
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Affiliation(s)
| | - Jixin Dong
- Correspondence: ; Tel.: +402-559-5596; Fax: +402-559-4651
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Expression and prognosis analyses of BUB1, BUB1B and BUB3 in human sarcoma. Aging (Albany NY) 2021; 13:12395-12409. [PMID: 33872216 PMCID: PMC8148488 DOI: 10.18632/aging.202944] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 03/27/2021] [Indexed: 01/13/2023]
Abstract
Budding Uninhibited By Benzimidazoles are a group of genes encoding proteins that play central roles in spindle checkpoint during mitosis. Improper mitosis may lead to aneuploidy which is found in many types of tumors. As a key mediator in mitosis, the dysregulated expression of BUBs has been proven to be highly associated with various malignancies, such as leukemia, gastric cancer, breast cancer, and liver cancer. However, bioinformatic analysis has not been applied to explore the role of the BUBs in sarcomas. Herein, we investigate the transcriptional and survival data of BUBs in patients with sarcomas using Oncomine, Gene Expression Profiling Interactive Analysis, Cancer Cell Line Encyclopedia, Kaplan-Meier Plotter, LinkedOmics, and the Database for Annotation, Visualization and Integrated Discovery. We found that the expression levels of BUB1, BUB1B and BUB3 were higher in sarcoma samples and cell lines than in normal controls. Survival analysis revealed that the higher expression levels of BUB1, BUB1B and BUB3 were associated with lower overall and disease-free survival in patients with sarcomas. This study implies that BUB1, BUB1B and BUB3 are potential treatment targets for patients with sarcomas and are new biomarkers for the prognosis of sarcomas.
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Abstract
Accurate chromosome segregation is required for cell survival and organismal development. During mitosis, the spindle assembly checkpoint acts as a safeguard to maintain the high fidelity of mitotic chromosome segregation by monitoring the attachment of kinetochores to the mitotic spindle. Bub1 is a conserved kinase critical for the spindle assembly checkpoint. Bub1 also facilitates chromosome alignment and contributes to the regulation of mitotic duration. Here, focusing on the spindle assembly checkpoint and on chromosome alignment, we summarize the primary literature on Bub1, discussing its structure and functional domains, as well its regulation and roles in mitosis. In addition, we discuss recent evidence for roles of Bub1 beyond mitosis regulation in TGFβ signaling and telomere replication. Finally, we discuss the involvement of Bub1 in human diseases, especially in cancer, and the potential of using Bub1 as a drug target for therapeutic applications.
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Affiliation(s)
- Taekyung Kim
- Department of Biology Education, Pusan National University, Busan, Korea
| | - Anton Gartner
- IBS Center for Genomic Integrity, Ulsan, Korea.,School of Life Sciences, Ulsan National Institute of Science and Technology
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Fujibayashi Y, Isa R, Nishiyama D, Sakamoto-Inada N, Kawasumi N, Yamaguchi J, Kuwahara-Ota S, Matsumura-Kimoto Y, Tsukamoto T, Chinen Y, Shimura Y, Kobayashi T, Horiike S, Taniwaki M, Handa H, Kuroda J. Aberrant BUB1 Overexpression Promotes Mitotic Segregation Errors and Chromosomal Instability in Multiple Myeloma. Cancers (Basel) 2020; 12:cancers12082206. [PMID: 32781708 PMCID: PMC7464435 DOI: 10.3390/cancers12082206] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 07/28/2020] [Accepted: 08/04/2020] [Indexed: 01/02/2023] Open
Abstract
Chromosome instability (CIN), the hallmarks of cancer, reflects ongoing chromosomal changes caused by chromosome segregation errors and results in whole chromosomal or segmental aneuploidy. In multiple myeloma (MM), CIN contributes to the acquisition of tumor heterogeneity, and thereby, to disease progression, drug resistance, and eventual treatment failure; however, the underlying mechanism of CIN in MM remains unclear. Faithful chromosomal segregation is tightly regulated by a series of mitotic checkpoint proteins, such as budding uninhibited by benzimidazoles 1 (BUB1). In this study, we found that BUB1 was overexpressed in patient-derived myeloma cells, and BUB1 expression was significantly higher in patients in an advanced stage compared to those in an early stage. This suggested the involvement of aberrant BUB1 overexpression in disease progression. In human myeloma-derived cell lines (HMCLs), BUB1 knockdown reduced the frequency of chromosome segregation errors in mitotic cells. In line with this, partial knockdown of BUB1 showed reduced variations in chromosome number compared to parent cells in HMCLs. Finally, BUB1 overexpression was found to promote the clonogenic potency of HMCLs. Collectively, these results suggested that enhanced BUB1 expression caused an increase in mitotic segregation errors and the resultant emergence of subclones with altered chromosome numbers and, thus, was involved in CIN in MM.
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Affiliation(s)
- Yuto Fujibayashi
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Reiko Isa
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Daichi Nishiyama
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Natsumi Sakamoto-Inada
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Norichika Kawasumi
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Junko Yamaguchi
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Saeko Kuwahara-Ota
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Yayoi Matsumura-Kimoto
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Taku Tsukamoto
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Yoshiaki Chinen
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
- Department of Hematology, Fukuchiyama City Hospital, Kyoto 620-8505, Japan
| | - Yuji Shimura
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Tsutomu Kobayashi
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Shigeo Horiike
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
| | - Masafumi Taniwaki
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
- Center for Molecular Diagnostics and Therapeutics, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
| | - Hiroshi Handa
- Department of Hematology, Gunma University Graduate School of Medicine, Gunma 371-8511, Japan;
| | - Junya Kuroda
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (Y.F.); (R.I.); (D.N.); (N.S.-I.); (N.K.); (J.Y.); (S.K.-O.); (Y.M.-K.); (T.T.); (Y.C.); (Y.S.); (T.K.); (S.H.); (M.T.)
- Correspondence: ; Tel.: +81-75-251-5740
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Adhikary J, Chakraborty S, Dalal S, Basu S, Dey A, Ghosh A. Circular PVT1: an oncogenic non-coding RNA with emerging clinical importance. J Clin Pathol 2019; 72:513-519. [PMID: 31154423 DOI: 10.1136/jclinpath-2019-205891] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 05/14/2019] [Accepted: 05/15/2019] [Indexed: 12/14/2022]
Abstract
The importance of circular RNAs (circRNAs) in pathological processes like cancer is evident. Among the circRNAs, recent studies have brought circPVT1 under focus as the most potent oncogenic non-coding RNA. Recent studies on various aspects of circPVT1, including its biogenesis, molecular alteration and its probable role in oncogenesis, have been conducted for research and clinical interest. In this review, a first attempt has been made to summarise the available data on circPVT1 from PubMed and other relevant databases with special emphasis on its role in development, progression and prognosis of various malignant conditions. CircPVT1 is derived from the same genetic locus encoding for long non-coding RNA lncPVT1; however, existing literature suggested circPVT1 and lncPVT1 are transcripted independently by different promoters. The interaction between circRNA and microRNA has been highlighted in majority of the few malignancies in which circPVT1 was studied. Besides its importance in diagnostic and prognostic procedures, circPVT1 seemed to have huge therapeutic potential as evident from differential drug response of cancer cell line as well as primary tumors depending on expression level of the candidate. circPVT1 in cancer therapeutics might be promising as a biomarker to make the existing treatment protocol more effective and also as potential target for designing novel therapeutic intervention.
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Affiliation(s)
- Jayashree Adhikary
- Department of Life Sciences, Presidency University Kolkata, Kolkata, India
| | | | - Subhamita Dalal
- Department of Life Sciences, Presidency University Kolkata, Kolkata, India
| | | | - Abhijit Dey
- Department of Life Sciences, Presidency University Kolkata, Kolkata, India
| | - Amlan Ghosh
- Department of Life Sciences, Presidency University Kolkata, Kolkata, India
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9
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Bond MJ, Bleiler M, Harrison LE, Scocchera EW, Nakanishi M, G-Dayanan N, Keshipeddy S, Rosenberg DW, Wright DL, Giardina C. Spindle Assembly Disruption and Cancer Cell Apoptosis with a CLTC-Binding Compound. Mol Cancer Res 2018; 16:1361-1372. [PMID: 29769406 DOI: 10.1158/1541-7786.mcr-18-0178] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 04/05/2018] [Accepted: 04/25/2018] [Indexed: 11/16/2022]
Abstract
AK3 compounds are mitotic arrest agents that induce high levels of γH2AX during mitosis and apoptosis following release from arrest. We synthesized a potent AK3 derivative, AK306, that induced arrest and apoptosis of the HCT116 colon cancer cell line with an EC50 of approximately 50 nmol/L. AK306 was active on a broad spectrum of cancer cell lines with total growth inhibition values ranging from approximately 25 nmol/L to 25 μmol/L. Using biotin and BODIPY-linked derivatives of AK306, binding to clathrin heavy chain (CLTC/CHC) was observed, a protein with roles in endocytosis and mitosis. AK306 inhibited mitosis and endocytosis, while disrupting CHC cellular localization. Cells arrested in mitosis by AK306 showed the formation of multiple microtubule-organizing centers consisting of pericentrin, γ-tubulin, and Aurora A foci, without apparent centrosome amplification. Cells released from AK306 arrest were unable to form bipolar spindles, unlike nocodazole-released cells that reformed spindles and completed division. Like AK306, CHC siRNA knockdown disrupted spindle formation and activated p53. A short-term (3-day) treatment of tumor-bearing APC-mutant mice with AK306 increased apoptosis in tumors, but not normal mucosa. These findings indicate that targeting the mitotic CHC complex can selectively induce apoptosis and may have therapeutic value.Implication: Disruption of clathrin with a small-molecule inhibitor, AK306, selectively induces apoptosis in cancer cells by disrupting bipolar spindle formation. Mol Cancer Res; 16(9); 1361-72. ©2018 AACR.
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Affiliation(s)
- Michael J Bond
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut.,Department of Pharmacology, Yale University, New Haven, Connecticut
| | - Marina Bleiler
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut
| | - Lauren E Harrison
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut
| | - Eric W Scocchera
- Department of Medicinal Chemistry, University of Connecticut, Storrs, Connecticut
| | - Masako Nakanishi
- Center for Molecular Oncology, UConn Health, Farmington, Connecticut
| | - Narendran G-Dayanan
- Department of Medicinal Chemistry, University of Connecticut, Storrs, Connecticut
| | - Santosh Keshipeddy
- Department of Medicinal Chemistry, University of Connecticut, Storrs, Connecticut
| | | | - Dennis L Wright
- Department of Medicinal Chemistry, University of Connecticut, Storrs, Connecticut
| | - Charles Giardina
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut.
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10
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Deregulation of the spindle assembly checkpoint is associated with paclitaxel resistance in ovarian cancer. J Ovarian Res 2018; 11:27. [PMID: 29618387 PMCID: PMC5885411 DOI: 10.1186/s13048-018-0399-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 03/19/2018] [Indexed: 11/29/2022] Open
Abstract
Background Ovarian cancer is the leading gynecologic cancer diagnosed in North America and because related symptoms are not disease specific, this often leads to late detection, an advanced disease state, and the need for chemotherapy. Ovarian cancer is frequently sensitive to chemotherapy at diagnosis but rapid development of drug resistance leads to disease progression and ultimately death in the majority of patients. Results We have generated paclitaxel resistant ovarian cell lines from their corresponding native cell lines to determine driver mechanisms of drug resistance using gene expression arrays. These paclitaxel resistant ovarian cells demonstrate: (1) Increased IC50 for paclitaxel and docetaxel (10 to 75-fold) and cross-resistance to anthracyclines (2) Reduced cell apoptosis in the presence of paclitaxel (3) Gene depletion involving mitotic regulators BUB1 mitotic checkpoint serine/threonine kinase, cyclin BI (CCNB1), centromere protein E (CENPE), and centromere protein F (CENPF), and (4) Functional data validating gene depletion among mitotic regulators. Conclusions We have generated model systems to explore drug resistance in ovarian cancer, which have revealed a key pathway related to the spindle assembly checkpoint underlying paclitaxel resistance in ovarian cell lines. Electronic supplementary material The online version of this article (10.1186/s13048-018-0399-7) contains supplementary material, which is available to authorized users.
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11
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Wenzel ES, Singh ATK. Cell-cycle Checkpoints and Aneuploidy on the Path to Cancer. In Vivo 2018; 32:1-5. [PMID: 29275292 PMCID: PMC5892633 DOI: 10.21873/invivo.11197] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 10/19/2017] [Accepted: 10/25/2017] [Indexed: 02/06/2023]
Abstract
The cell cycle is a complex sequence of events through which a cell duplicates its contents and divides, and involves many regulatory proteins for proper cellular reproduction, including cyclin proteins and cyclin-dependent kinases, oncogenes and tumor-suppressor genes, and mitotic checkpoint proteins. Mutations of any of these regulatory mechanisms can lead to reproduction of cells carrying genetic mutations or abnormal numbers of chromosomes, resulting in genomic instability. Chromosomal instability, contributing to genomic instability, refers to abnormalities in the number of chromosomes, and leads to aneuploidy. The role of aneuploidy in cancer cell development is often disputed, as conflicting hypotheses and research make it unclear as to whether aneuploidy is a cause or consequence of cancer. Here, we present an overview of the importance of cell-cycle checkpoint regulation and chromosomal instability in the development of cancer, and discuss evidence for conflicting arguments for the role of aneuploidy in cancer, leading us to conclude that further investigation of this role would benefit our understanding of cancer development.
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Affiliation(s)
- Elizabeth S Wenzel
- Department of Biology, Division of Natural and Social Sciences, Carthage College, Kenosha, WI, U.S.A
| | - Amareshwar T K Singh
- Department of Biology, Division of Natural and Social Sciences, Carthage College, Kenosha, WI, U.S.A.
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12
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Polymorphisms in mitotic checkpoint-related genes can influence survival outcomes of early-stage non-small cell lung cancer. Oncotarget 2017; 8:61777-61785. [PMID: 28977903 PMCID: PMC5617463 DOI: 10.18632/oncotarget.18693] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 05/22/2017] [Indexed: 12/22/2022] Open
Abstract
This study was conducted to investigate the association between variants in mitotic checkpoint-related genes and clinical outcomes of non-small cell lung cancer (NSCLC). A total of 766 patients with NSCLC who underwent curative surgery were enrolled. Among the 73 variants evaluated, 4 variants were related with survival outcomes. BUB3 rs7897156C>T was associated with worse overall survival under a recessive model (adjusted hazard ratio = 1.58, 95% confidence interval = 1.07–2.33, P = 0.02). AURKB rs1059476G>A was associated with better overall survival under a recessive model (adjusted hazard ratio = 0.64, 95% confidence interval = 0.41–0.99, P = 0.05). PTTG1 rs1895320T>C and RAD21 rs1374297C>G were associated with worse disease-free survival. In the functional study, relative luciferase activity was higher at the BUB3 rs7897156T allele compared to that at the C allele. Western blot showed that the phosphorylation of AKT and mTOR in the AURKB variant-type (M298) was significantly lower than in the AURKB wild-type (T298). We found that 4 variants of mitotic checkpoint-related genes were associated with survival outcomes in patients with surgically resected NSCLC. Particularly, our results suggest that BUB3 rs7897156C>T and AURKB rs1059476G>A are functional variants.
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13
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Miyashita K, Fujii K, Taguchi K, Shimokawa M, Yoshida MA, Abe Y, Okamura J, Oda S, Uike N. A specific mode of microsatellite instability is a crucial biomarker in adult T-cell leukaemia/lymphoma patients. J Cancer Res Clin Oncol 2016; 143:399-408. [PMID: 27783137 PMCID: PMC5306345 DOI: 10.1007/s00432-016-2294-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 10/18/2016] [Indexed: 11/25/2022]
Abstract
Purpose Microsatellite instability (MSI) has been a long-standing biomarker candidate for drug resistance in tumour cells. Despite numerous clinical studies, the data in the literature are not conclusive. The complexity of the MSI phenomenon in some malignancies may, at least partly, account for the discrepancy. In addition, methodological problems are also pointed out in the assay techniques. We previously established a unique fluorescent technique in which the major methodological problems in conventional assays are overcome. Application of this technique has revealed two distinct modes of microsatellite alterations, i.e. Type A and Type B. More importantly, we demonstrated that Type A MSI is the direct consequence of defective DNA mismatch repair (MMR) that causes cellular resistance against antineoplastic agents. Method We first applied this technique to adult T-cell leukaemia/lymphoma (ATLL). Results The MSI phenomenon was indeed observed in ATLLs (4/20, 20%). Intriguingly, the observed microsatellite alterations were invariably Type A, which implies that the tumours were MMR-defective. Indeed, clinical outcomes of patients with these MSI+ tumours were significantly worse. Furthermore, multivariate analysis revealed that Type A MSI is an independent prognostic factor. Conclusion These observations strongly suggest the possibility of Type A MSI as a prognostic and potentially predictive biomarker in ATLL.
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Affiliation(s)
- Kaname Miyashita
- Clinical Research Institute, National Kyushu Cancer Center, Fukuoka, 811-1395, Japan.,Department of Hematology, National Kyushu Cancer Center, Fukuoka, 811-1395, Japan.,Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Kei Fujii
- Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Kenichi Taguchi
- Clinical Research Institute, National Kyushu Cancer Center, Fukuoka, 811-1395, Japan
| | - Mototsugu Shimokawa
- Clinical Research Institute, National Kyushu Cancer Center, Fukuoka, 811-1395, Japan
| | - Mitsuaki A Yoshida
- Department of Radiation Biology, Institute of Radiation Emergency Medicine, Hirosaki University, Aomori, 036-8560, Japan
| | - Yasunobu Abe
- Department of Hematology, National Kyushu Cancer Center, Fukuoka, 811-1395, Japan
| | - Jun Okamura
- Clinical Research Institute, National Kyushu Cancer Center, Fukuoka, 811-1395, Japan
| | - Shinya Oda
- Clinical Research Institute, National Kyushu Cancer Center, Fukuoka, 811-1395, Japan.
| | - Naokuni Uike
- Department of Hematology, National Kyushu Cancer Center, Fukuoka, 811-1395, Japan
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14
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In silico analysis of deleterious single nucleotide polymorphisms in human BUB1 mitotic checkpoint serine/threonine kinase B gene. Meta Gene 2016; 9:142-50. [PMID: 27331020 PMCID: PMC4913181 DOI: 10.1016/j.mgene.2016.05.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 04/12/2016] [Accepted: 05/06/2016] [Indexed: 11/23/2022] Open
Abstract
One of the major challenges in the analysis of human genetic variation is to distinguish mutations that are functionally neutral from those that contribute to disease. BubR1 is a key protein mediating spindle-checkpoint activation that plays a role in the inhibition of the anaphase-promoting complex/cyclosome (APC/C), delaying the onset of anaphase and ensuring proper chromosome segregation. Owing to the importance of BUB1B gene in mitotic checkpoint a functional analysis using different in silico approaches was undertaken to explore the possible associations between genetic mutations and phenotypic variation. In this work we found that 3 nsSNPs I82N, P334L and R814H have a functional effect on protein function and stability. A literature search revealed that R814H was already implicated in human diseases. Additionally, 2 SNPs in the 5' UTR region was predicted to exhibit a pattern change in the internal ribosome entry site (IRES), and eight MicroRNA binding sites were found to be highly affected due to 3' UTR SNPs. These in silico predictions will provide useful information in selecting the target SNPs that are likely to have functional impact on the BUB1B gene.
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15
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16
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Kapanidou M, Lee S, Bolanos-Garcia VM. BubR1 kinase: protection against aneuploidy and premature aging. Trends Mol Med 2015; 21:364-72. [DOI: 10.1016/j.molmed.2015.04.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 03/23/2015] [Accepted: 04/07/2015] [Indexed: 11/28/2022]
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17
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Krem MM, Press OW, Horwitz MS, Tidwell T. Mechanisms and clinical applications of chromosomal instability in lymphoid malignancy. Br J Haematol 2015; 171:13-28. [PMID: 26018193 DOI: 10.1111/bjh.13507] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Lymphocytes are unique among cells in that they undergo programmed DNA breaks and translocations, but that special property predisposes them to chromosomal instability (CIN), a cardinal feature of neoplastic lymphoid cells that manifests as whole chromosome- or translocation-based aneuploidy. In several lymphoid malignancies translocations may be the defining or diagnostic markers of the diseases. CIN is a cornerstone of the mutational architecture supporting lymphoid neoplasia, though it is perhaps one of the least understood components of malignant transformation in terms of its molecular mechanisms. CIN is associated with prognosis and response to treatment, making it a key area for impacting treatment outcomes and predicting prognoses. Here we will review the types and mechanisms of CIN found in Hodgkin lymphoma, non-Hodgkin lymphoma, multiple myeloma and the lymphoid leukaemias, with emphasis placed on pathogenic mutations affecting DNA recombination, replication and repair; telomere function; and mitotic regulation of spindle attachment, centrosome function, and chromosomal segregation. We will discuss the means by which chromosome-level genetic aberrations may give rise to multiple pathogenic mutations required for carcinogenesis and conclude with a discussion of the clinical applications of CIN and aneuploidy to diagnosis, prognosis and therapy.
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Affiliation(s)
- Maxwell M Krem
- Department of Medicine and Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA, USA.,Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Oliver W Press
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Marshall S Horwitz
- Department of Pathology and Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA, USA
| | - Timothy Tidwell
- Department of Pathology and Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA, USA
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18
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Impairment of cell cycle progression by sterigmatocystin in human pulmonary cells in vitro. Food Chem Toxicol 2014; 66:89-95. [DOI: 10.1016/j.fct.2014.01.024] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 01/11/2014] [Accepted: 01/14/2014] [Indexed: 01/11/2023]
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19
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Karess RE, Wassmann K, Rahmani Z. New insights into the role of BubR1 in mitosis and beyond. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2013; 306:223-73. [PMID: 24016527 DOI: 10.1016/b978-0-12-407694-5.00006-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
BubR1 is a critical component of the spindle assembly checkpoint, the surveillance mechanism that helps maintain the high fidelity of mitotic chromosome segregation by preventing cells from initiating anaphase if one or more kinetochores are not attached to the spindle. BubR1 also helps promote the establishment of stable kinetochore-microtubule attachments during prometaphase. In this chapter, we review the structure, functions, and regulation of BubR1 in these "classical roles" at the kinetochore. We discuss its recruitment to kinetochores, its assembly into the inhibitor of anaphase progression, and the importance of its posttranslational modifications. We also consider the evidence for its participation in other roles beyond mitosis, such as the meiosis-specific processes of recombination and prophase arrest of the first meiotic division, the cellular response to DNA damage, and in the regulation of centrosome and basal body function. Finally, studies are presented linking BubR1 dysfunction or misregulation to aging and human disease, particularly cancer.
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Affiliation(s)
- Roger E Karess
- Institut Jacques Monod, UMR 7592 CNRS, Université Paris Diderot-Paris 7, Paris, France.
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20
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Up-regulation of the mitotic checkpoint component Mad1 causes chromosomal instability and resistance to microtubule poisons. Proc Natl Acad Sci U S A 2012; 109:E2205-14. [PMID: 22778409 DOI: 10.1073/pnas.1201911109] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The mitotic checkpoint is the major cell cycle checkpoint acting during mitosis to prevent aneuploidy and chromosomal instability, which are hallmarks of tumor cells. Reduced expression of the mitotic checkpoint component Mad1 causes aneuploidy and promotes tumors in mice [Iwanaga Y, et al. (2007) Cancer Res 67:160-166]. However, the prevalence and consequences of Mad1 overexpression are currently unclear. Here we show that Mad1 is frequently overexpressed in human cancers and that Mad1 up-regulation is a marker of poor prognosis. Overexpression of Mad1 causes aneuploidy and chromosomal instability through weakening mitotic checkpoint signaling caused by mislocalization of the Mad1 binding partner Mad2. Cells overexpressing Mad1 are resistant to microtubule poisons, including currently used chemotherapeutic agents. These results suggest that levels of Mad1 must be tightly regulated to prevent aneuploidy and transformation and that Mad1 up-regulation may promote tumors and cause resistance to current therapies.
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21
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Bolanos-Garcia V, Lischetti T, Matak-Vinković D, Cota E, Simpson P, Chirgadze D, Spring D, Robinson C, Nilsson J, Blundell T. Structure of a Blinkin-BUBR1 complex reveals an interaction crucial for kinetochore-mitotic checkpoint regulation via an unanticipated binding Site. Structure 2011; 19:1691-700. [PMID: 22000412 PMCID: PMC3267040 DOI: 10.1016/j.str.2011.09.017] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 09/25/2011] [Accepted: 09/28/2011] [Indexed: 11/20/2022]
Abstract
The maintenance of genomic stability relies on the spindle assembly checkpoint (SAC), which ensures accurate chromosome segregation by delaying the onset of anaphase until all chromosomes are properly bioriented and attached to the mitotic spindle. BUB1 and BUBR1 kinases are central for this process and by interacting with Blinkin, link the SAC with the kinetochore, the macromolecular assembly that connects microtubules with centromeric DNA. Here, we identify the Blinkin motif critical for interaction with BUBR1, define the stoichiometry and affinity of the interaction, and present a 2.2 Å resolution crystal structure of the complex. The structure defines an unanticipated BUBR1 region responsible for the interaction and reveals a novel Blinkin motif that undergoes a disorder-to-order transition upon ligand binding. We also show that substitution of several BUBR1 residues engaged in binding Blinkin leads to defects in the SAC, thus providing the first molecular details of the recognition mechanism underlying kinetochore-SAC signaling.
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Affiliation(s)
| | - Tiziana Lischetti
- The NNF Center for Protein Research, Faculty of Health Sciences, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen, Denmark
| | | | - Ernesto Cota
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
| | - Pete J. Simpson
- Department of Life Sciences, Imperial College London, London SW7 2AZ, UK
| | | | - David R. Spring
- The NNF Center for Protein Research, Faculty of Health Sciences, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen, Denmark
| | - Carol V. Robinson
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
- Department of Chemistry, University of Oxford, Oxford OX1 3QZ, UK
| | - Jakob Nilsson
- The NNF Center for Protein Research, Faculty of Health Sciences, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen, Denmark
| | - Tom L. Blundell
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK
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22
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Barbosa J, Nascimento AV, Faria J, Silva P, Bousbaa H. The spindle assembly checkpoint: perspectives in tumorigenesis and cancer therapy. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/s11515-011-1122-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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23
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Xing X, Wang J, Xing LX, Li YH, Yan X, Zhang XH. Involvement of MAPK and PI3K signaling pathway in sterigmatocystin-induced G2
phase arrest in human gastric epithelium cells. Mol Nutr Food Res 2011; 55:749-60. [DOI: 10.1002/mnfr.201000344] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2010] [Revised: 10/20/2010] [Accepted: 11/22/2010] [Indexed: 11/10/2022]
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24
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Bolanos-Garcia VM, Blundell TL. BUB1 and BUBR1: multifaceted kinases of the cell cycle. Trends Biochem Sci 2010; 36:141-50. [PMID: 20888775 PMCID: PMC3061984 DOI: 10.1016/j.tibs.2010.08.004] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Revised: 08/19/2010] [Accepted: 08/24/2010] [Indexed: 11/21/2022]
Abstract
The multidomain protein kinases BUB1 and BUBR1 (Mad3 in yeast, worms and plants) are central components of the mitotic checkpoint for spindle assembly (SAC). This evolutionarily conserved and essential self-monitoring system of the eukaryotic cell cycle ensures the high fidelity of chromosome segregation by delaying the onset of anaphase until all chromosomes are properly bi-oriented on the mitotic spindle. Despite their amino acid sequence conservation and similar domain organization, BUB1 and BUBR1 perform different functions in the SAC. Recent structural information provides crucial molecular insights into the regulation and recognition of BUB1 and BUBR1, and a solid foundation to dissect the roles of these proteins in the control of chromosome segregation in normal and oncogenic cells.
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Affiliation(s)
- Victor M Bolanos-Garcia
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, CB2 1GA. Cambridge, England.
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25
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Cui J, Xing L, Li Z, Wu S, Wang J, Liu J, Wang J, Yan X, Zhang X. Ochratoxin A induces G2 phase arrest in human gastric epithelium GES-1 cells in vitro. Toxicol Lett 2010; 193:152-8. [PMID: 20060447 DOI: 10.1016/j.toxlet.2009.12.019] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2009] [Revised: 12/23/2009] [Accepted: 12/30/2009] [Indexed: 12/28/2022]
Affiliation(s)
- Jinfeng Cui
- Department of Pathology, The Second Hospital, Hebei Medical University, Shijiazhuang, China
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26
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Niikura Y, Ogi H, Kikuchi K, Kitagawa K. BUB3 that dissociates from BUB1 activates caspase-independent mitotic death (CIMD). Cell Death Differ 2010; 17:1011-24. [PMID: 20057499 DOI: 10.1038/cdd.2009.207] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The cell death mechanism that prevents aneuploidy caused by a failure of the spindle checkpoint has recently emerged as an important regulatory paradigm. We previously identified a new type of mitotic cell death, termed caspase-independent mitotic death (CIMD), which is induced during early mitosis by partial BUB1 (a spindle checkpoint protein) depletion and defects in kinetochore-microtubule attachment. In this study, we have shown that survived cells that escape CIMD have abnormal nuclei, and we have determined the molecular mechanism by which BUB1 depletion activates CIMD. The BUB3 protein (a BUB1 interactor and a spindle checkpoint protein) interacts with p73 (a homolog of p53), specifically in cells wherein CIMD occurs. The BUB3 protein that is freed from BUB1 associates with p73 on which Y99 is phosphorylated by c-Abl tyrosine kinase, resulting in the activation of CIMD. These results strongly support the hypothesis that CIMD is the cell death mechanism protecting cells from aneuploidy by inducing the death of cells prone to substantial chromosome missegregation.
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Affiliation(s)
- Y Niikura
- Department of Molecular Pharmacology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
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27
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Klebig C, Korinth D, Meraldi P. Bub1 regulates chromosome segregation in a kinetochore-independent manner. ACTA ACUST UNITED AC 2009; 185:841-58. [PMID: 19487456 PMCID: PMC2711590 DOI: 10.1083/jcb.200902128] [Citation(s) in RCA: 153] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The kinetochore-bound protein kinase Bub1 performs two crucial functions during mitosis: it is essential for spindle checkpoint signaling and for correct chromosome alignment. Interestingly, Bub1 mutations are found in cancer tissues and cancer cell lines. Using an isogenic RNA interference complementation system in transformed HeLa cells and untransformed RPE1 cells, we investigate the effect of structural Bub1 mutants on chromosome segregation. We demonstrate that Bub1 regulates mitosis through the same mechanisms in both cell lines, suggesting a common regulatory network. Surprisingly, Bub1 can regulate chromosome segregation in a kinetochore-independent manner, albeit at lower efficiency. Its kinase activity is crucial for chromosome alignment but plays only a minor role in spindle checkpoint signaling. We also identify a novel conserved motif within Bub1 (amino acids 458–476) that is essential for spindle checkpoint signaling but does not regulate chromosome alignment, and we show that several cancer-related Bub1 mutants impair chromosome segregation, suggesting a possible link to tumorigenesis.
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Affiliation(s)
- Christiane Klebig
- Institute of Biochemistry, Eidgenössische Technische Hochschule (ETH) Zurich, 8093 Zurich, Switzerland
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28
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Tomita M, Toyota M, Ishikawa C, Nakazato T, Okudaira T, Matsuda T, Uchihara JN, Taira N, Ohshiro K, Senba M, Tanaka Y, Ohshima K, Saya H, Tokino T, Mori N. Overexpression of Aurora A by loss of CHFR gene expression increases the growth and survival of HTLV-1-infected T cells through enhanced NF-kappaB activity. Int J Cancer 2009; 124:2607-15. [PMID: 19230025 DOI: 10.1002/ijc.24257] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Human T-cell leukemia virus type 1 (HTLV-1) is the etiologic agent for adult T-cell leukemia (ATL). Aurora A, a mitotic checkpoint protein, is overexpressed in human cancer cells. The cell cycle-dependent turnover of Aurora A is regulated by E3 ubiquitin ligases such as checkpoint with fork head-associated and ring finger (CHFR). Here, we found overexpression of Aurora A protein in HTLV-1-infected T-cell lines and primary ATL cells. The expression of CHFR mRNA was reduced in these cells by abnormal methylation of CHFR promoter region. Knockdown of Aurora A using small interfering RNA suppressed the growth of HTLV-1-infected T-cell line. Transfection of Aurora A expression plasmid enhanced Tax-induced nuclear factor-kappaB (NF-kappaB) reporter activity. Transfection of CHFR expression plasmid into an HTLV-1-infected T-cell line reduced cell growth, Aurora A protein level and constitutive NF-kappaB reporter activity. Aurora kinase inhibitor suppressed the growth and survival of HTLV-1-infected T-cell lines and primary ATL cells. It also reduced constitutive NF-kappaB activity in an HTLV-1-infected T-cell line by reducing IkappaB kinase beta phosphorylation and the expression of antiapoptotic protein survivin. Our results suggested that loss of CHFR expression resulted to accumulation of Aurora A, which increased NF-kappaB activity. These findings highlight the critical role of Aurora A in HTLV-1-infected T cells, making this molecule a potentially suitable target for future therapies for ATL.
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Affiliation(s)
- Mariko Tomita
- Division of Molecular Virology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan
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Harrison M, Swanton C. Epothilones and new analogues of the microtubule modulators in taxane-resistant disease. Expert Opin Investig Drugs 2008; 17:523-46. [PMID: 18363517 DOI: 10.1517/13543784.17.4.523] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Microtubule-stabilising agents typified by the epothilone class of drug have demonstrated promising activity in Phase II and III clinical trials. OBJECTIVE Data supporting the efficacy of these agents are reviewed and their potential use in taxane-refractory disease assessed. METHODS Preclinical evidence assessing the role of the spindle assembly checkpoint in determining the cellular response to microtubule stabilization are presented together with clinical data documenting the efficacy of non-taxane microtubule modulators. RESULTS/CONCLUSIONS Evidence suggests that microtubule-stabilising agents prolong activation of the spindle assembly checkpoint which may promote cancer cell death in mitosis or following mitotic exit. A weakened spindle assembly checkpoint is associated with altered sensitivity to agents targeting the microtubule and therefore pathways of drug resistance may be shared by these cytotoxic therapies. Preliminary clinical trial data do suggest modest activity of epothilones in truly taxane-resistant patient cohorts, indicating the potential niche for these agents in a molecularly undefined patient group, potentially implicating the role of P-glycoprotein in the acquisition of taxane-resistant disease. Trial data of these antimitotic agents will be presented together with their potential role in taxane-resistant disease and the implications for future clinical trial design.
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Affiliation(s)
- Michelle Harrison
- Royal Prince Alfred Hospital, Department of Medical Oncology, Missenden Road, Camperdown, Sydney 2050, Australia
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30
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The impact of p53 and p73 on aneuploidy and cancer. Trends Cell Biol 2008; 18:244-52. [PMID: 18406616 DOI: 10.1016/j.tcb.2008.03.003] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2008] [Revised: 03/03/2008] [Accepted: 03/04/2008] [Indexed: 02/06/2023]
Abstract
Initiation, progression and evasion are sequential steps in cancer formation, with autonomous cell proliferation as a final outcome. Genetic or epigenetic alterations of key regulatory genes of the cell cycle are frequently associated with these phenomena. Recently, chromosomal instability, a long-supposed driving force of tumorigenesis, was associated with dysregulation of mitotic genes, providing advantages to tumor cells. Numerous molecules thus provide a key link in the chain of relationships between chromosomal instability and cancer. Here, we discuss emerging evidence revealing that two p53 family members, p53 and p73, might be key regulatory genes at the heart of the relationship between chromosomal instability and cancer. We argue that the role of members of the p53 family as tumor suppressor proteins, their impact on the control of cellular ploidy, and their newly emerging connection with mitotic checkpoint regulatory genes support the suggestion that p73 and p53 could be two of the missing links among chromosomal instability, the mitotic checkpoint and cancer.
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Spindle assembly checkpoint and centrosome abnormalities in oral cancer. Cancer Lett 2007; 258:276-85. [PMID: 17959302 DOI: 10.1016/j.canlet.2007.09.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2007] [Revised: 08/16/2007] [Accepted: 09/12/2007] [Indexed: 02/06/2023]
Abstract
Like many solid tumours, oral squamous cell carcinomas (OSCC) invariably exhibit chromosomal instability (CIN) leading to aneuploidy. The mechanisms responsible for CIN in OSCC, however, are largely unknown. This study examined the fidelity of the spindle checkpoint, together with the number, structure and function of centrosomes in a series of well-characterised aneuploid immortal OSCC-derived cell lines that harbour p53 and p16(INK4A) defects. The spindle checkpoints were fully functional in 2 of 7 cell lines and attenuated in the remaining 5 cell lines. Overexpression of the spindle checkpoint protein, Cdc20, was observed in 2 of the cell lines with attenuated checkpoints. Defects in centrosome number, size and localisation were detected in 5 of the cell lines. Clonal cell populations contained cells with both normal and abnormal numbers of centrosomes, suggesting that the control of centrosome number may be inherently unstable in OSCC-derived cell lines. Centrosomal abnormalities were then examined in tissue samples of oral epithelial dysplasias and carcinomas. Abnormal centrosomes were detected in all the tissues examined albeit in a low percentage of cells (<1% to >5%). The percentage of cells containing centrosome abnormalities was significantly higher in the carcinomas than in the dysplasias (p<0.02) and in the poorly differentiated SCCs relative to their moderately differentiated (p<0.04) and well-differentiated (p<0.01) counterparts. We suggest that the genetic alterations associated with the development of the immortal phenotype, together with spindle checkpoint and centrosome defects, are responsible, albeit in part, for the complex karyotypes observed in OSCC. The presence of centrosome abnormalities in oral dysplasias raises the possibility that such defects might contribute to malignant progression.
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Jeganathan K, Malureanu L, Baker DJ, Abraham SC, van Deursen JM. Bub1 mediates cell death in response to chromosome missegregation and acts to suppress spontaneous tumorigenesis. ACTA ACUST UNITED AC 2007; 179:255-67. [PMID: 17938250 PMCID: PMC2064762 DOI: 10.1083/jcb.200706015] [Citation(s) in RCA: 170] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The physiological role of the mitotic checkpoint protein Bub1 is unknown. To study this role, we generated a series of mutant mice with a gradient of reduced Bub1 expression using wild-type, hypomorphic, and knockout alleles. Bub1 hypomorphic mice are viable, fertile, and overtly normal despite weakened mitotic checkpoint activity and high percentages of aneuploid cells. Bub1 haploinsufficient mice, which have a milder reduction in Bub1 protein than Bub1 hypomorphic mice, also exhibit reduced checkpoint activity and increased aneuploidy, but to a lesser extent. Although cells from Bub1 hypomorphic and haploinsufficient mice have similar rates of chromosome missegregation, cell death after an aberrant separation decreases dramatically with declining Bub1 levels. Importantly, Bub1 hypomorphic mice are highly susceptible to spontaneous tumors, whereas Bub1 haploinsufficient mice are not. These findings demonstrate that loss of Bub1 below a critical threshold drives spontaneous tumorigenesis and suggest that in addition to ensuring proper chromosome segregation, Bub1 is important for mediating cell death when chromosomes missegregate.
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Affiliation(s)
- Karthik Jeganathan
- Department of Pediatrics, Mayo Clinic College of Medicine, Rochester, MN 55905, USA
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33
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Niikura Y, Dixit A, Scott R, Perkins G, Kitagawa K. BUB1 mediation of caspase-independent mitotic death determines cell fate. ACTA ACUST UNITED AC 2007; 178:283-96. [PMID: 17620410 PMCID: PMC2064447 DOI: 10.1083/jcb.200702134] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The spindle checkpoint that monitors kinetochore–microtubule attachment has been implicated in tumorigenesis; however, the relation between the spindle checkpoint and cell death remains obscure. In BUB1-deficient (but not MAD2-deficient) cells, conditions that activate the spindle checkpoint (i.e., cold shock or treatment with nocodazole, paclitaxel, or 17-AAG) induced DNA fragmentation during early mitosis. This mitotic cell death was independent of caspase activation; therefore, we named it caspase-independent mitotic death (CIMD). CIMD depends on p73, a homologue of p53, but not on p53. CIMD also depends on apoptosis-inducing factor and endonuclease G, which are effectors of caspase-independent cell death. Treatment with nocodazole, paclitaxel, or 17-AAG induced CIMD in cell lines derived from colon tumors with chromosome instability, but not in cells from colon tumors with microsatellite instability. This result was due to low BUB1 expression in the former cell lines. When BUB1 is completely depleted, aneuploidy rather than CIMD occurs. These results suggest that cells prone to substantial chromosome missegregation might be eliminated via CIMD.
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Affiliation(s)
- Yohei Niikura
- Department of Molecular Pharmacology, St Jude Children's Research Hospital, Memphis, TN 38105, USA
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34
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Yasunaga JI, Matsuoka M. [HTLV-I and leukemogenesis]. Uirusu 2007; 56:241-9. [PMID: 17446673 DOI: 10.2222/jsv.56.241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Human T-cell leukemia virus type I (HTLV-I) is a causative virus of adult T-cell leukemia (ATL). ATL is a highly aggressive neoplastic disease of CD4 positive T lymphocyte, which is featured by the pleomorphic tumor cells with hypersegmented nuclei, called " flower cell". HTLV-I increases its copy number by clonal proliferation of the host cells, not by replication of the virus. Therefore, HTLV-I eventually induces ATL. Tax, encoded by HTLV-I pX region, has been recognized as a protein that plays a central role of the transformation of HTLV-I-infected cells by its pleiotropic actions. However, fresh ATL cells frequently lose Tax protein expression by several mechanisms. Recently, HBZ was identified in the complementary strand of HTLV-I and it is suggested that HBZ is a critical gene in leukemogenesis. Furthermore, there is a long latency period before onset of ATL, indicating the multistep mechanisms of leukemogenesis. Therefore, it is suggested that multiple factors, such as viral proteins, genetic and epigenetic changes of host genome, and immune status of the hosts, could be implicated in leukemogenesis of ATL.
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Affiliation(s)
- Jun-ichirou Yasunaga
- Laboratory of Human Tumor Viruses Department of Viral Oncology Institute for Virus Research, Kyoto University.
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35
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Singh VK, Zhou Y, Marsh JA, Uversky VN, Forman-Kay JD, Liu J, Jia Z. Synuclein-gamma targeting peptide inhibitor that enhances sensitivity of breast cancer cells to antimicrotubule drugs. Cancer Res 2007; 67:626-33. [PMID: 17234772 DOI: 10.1158/0008-5472.can-06-1820] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Synuclein-gamma (SNCG) plays oncogenic roles in breast carcinogenesis. Although the expression of SNCG is abnormally high in advanced and metastatic breast carcinomas, SNCG is not expressed in normal or benign breast tissues. SNCG is an intrinsically disordered protein known to interact with BubR1, a mitotic checkpoint kinase. The SNCG-BubR1 interaction inhibits mitotic checkpoint control upon spindle damage caused by anticancer drugs, such as nocodazole and taxol. Antimicrotubule drugs that cause mitotic arrest and subsequent apoptosis of cancer cells are frequently used to treat breast cancer patients with advanced or metastatic diseases. However, patient response rates to this class of chemotherapeutic agents vary significantly. In this study, we have designed a novel peptide (ANK) and shown its interaction with SNCG using fluorometry, surface plasmon resonance, and isothermal titration calorimetry. Binding of the ANK peptide did not induce folding of SNCG, suggesting that SNCG can function biologically in its intrinsically disordered state. Microinjection of the ANK peptide in breast cancer cell line overexpressing SNCG (MCF7-SNCG) exhibited a similar cell killing response by nocodazole as in the SNCG-negative MCF7 cells. Overexpression of enhanced green fluorescent protein-tagged ANK reduces SNCG-mediated resistance to paclitaxel treatment by approximately 3.5-fold. Our coimmunoprecipitation and colocalization results confirmed the intracellular association of the ANK peptide with SNCG. This is likely due to the disruption of the interaction of SNCG with BubR1 interaction. Our findings shed light on the molecular mechanism of the ANK peptide in releasing SNCG-mediated drug resistance.
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Affiliation(s)
- Vinay K Singh
- Department of Biochemistry, Queen's University, Kingston, Ontario, and Molecular Structure and Function, Hospital for Sick Children, Toronto, Canada
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36
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Weaver BAA, Cleveland DW. Does aneuploidy cause cancer? Curr Opin Cell Biol 2006; 18:658-67. [PMID: 17046232 DOI: 10.1016/j.ceb.2006.10.002] [Citation(s) in RCA: 389] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2006] [Accepted: 10/02/2006] [Indexed: 11/24/2022]
Abstract
Aneuploidy has been recognized as a common characteristic of cancer cells for >100 years. Aneuploidy frequently results from errors of the mitotic checkpoint, the major cell cycle control mechanism that acts to prevent chromosome missegregation. The mitotic checkpoint is often compromised in human tumors, although not as a result of germline mutations in genes encoding checkpoint proteins. Less obviously, aneuploidy of whole chromosomes rapidly results from mutations in genes encoding several tumor suppressors and DNA mismatch repair proteins, suggesting cooperation between mechanisms of tumorigenesis that were previously thought to act independently. Cumulatively, the current evidence suggests that aneuploidy promotes tumorigenesis, at least at low frequency, but a definitive test has not yet been reported.
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Affiliation(s)
- Beth A A Weaver
- Ludwig Institute for Cancer Research, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0670, USA
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37
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Malmanche N, Maia A, Sunkel CE. The spindle assembly checkpoint: Preventing chromosome mis-segregation during mitosis and meiosis. FEBS Lett 2006; 580:2888-95. [PMID: 16631173 DOI: 10.1016/j.febslet.2006.03.081] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2006] [Revised: 03/16/2006] [Accepted: 03/22/2006] [Indexed: 11/17/2022]
Abstract
Aneuploidy is a common feature of many cancers, suggesting that genomic stability is essential to prevent tumorigenesis. Also, during meiosis, chromosome non-disjunction produces gamete imbalance and when fertilized result in developmental arrest or severe birth defects. The spindle assembly checkpoint prevents chromosome mis-segregation during both mitosis and meiosis. In mitosis, this control system monitors kinetochore-microtubule attachment while in meiosis its role is still unclear. Interestingly, recent data suggest that defects in the spindle assembly checkpoint are unlikely to cause cancer development but might facilitate tumour progression. However, in meiosis a weakened checkpoint could contribute to age-related aneuploidy found in humans.
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Affiliation(s)
- Nicolas Malmanche
- IBMC, Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre 823, 4150-180 Porto, Portugal
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38
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Sasaki M, Sugimoto K, Tamayose K, Ando M, Tanaka Y, Oshimi K. Spindle checkpoint protein Bub1 corrects mitotic aberrancy induced by human T-cell leukemia virus type I Tax. Oncogene 2006; 25:3621-7. [PMID: 16449967 DOI: 10.1038/sj.onc.1209404] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Bub1 is a component of the mitotic spindle checkpoint apparatus. Abnormality of this apparatus is known to cause multinuclei formation, a hallmark of chromosomal instability (CIN). A549, aneuploid cell line, aberrantly passed through the mitotic phase and became multinuclei morphology in the presence of nocodazole. Time-lapse videomicroscopy showed unreported bizarre morphology, which we named 'mitotic lobulation' in A549 cells just before the exit from mitosis and multinuclei formation. External expression of wild-type Bub1-EGFP clearly suppressed the multinuclei formation by retaining A549 cells at the mitotic phase during 48 h of time-lapse observation. This suppressive effect on mitotic aberrancy should not be mere restoration of normal Bub1 function, because A549 cells express proper amount of Bub1, which distributed cytoplasm during interphase and concentrated at kinetochore in metaphase. Furthermore, external expression of wild-type Bub1-EGFP suppressed multinuclei formation induced by Tax both in A549 and HeLa cells. Tax is known to induce mitotic abnormality by binding and inactivating Mad1. These observations, therefore, suggest functional redundancy between Bub1 and other mitotic checkpoint protein(s) and a possibility of correction of mitotic aberrancy by external Bub1 expression.
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Affiliation(s)
- M Sasaki
- Department of Internal Medicine, Division of Hematology, Juntendo University School of Medicine, Tokyo, Japan
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39
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Yuen KWY, Montpetit B, Hieter P. The kinetochore and cancer: what's the connection? Curr Opin Cell Biol 2005; 17:576-82. [PMID: 16233975 DOI: 10.1016/j.ceb.2005.09.012] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2005] [Accepted: 09/29/2005] [Indexed: 12/19/2022]
Abstract
The molecular mechanisms ensuring accurate chromosome segregation during meiosis and mitosis are critical to the conservation of euploidy (normal chromosome number) in eukaryotic cells. A dysfunctional kinetochore represents one possible source for chromosome instability (CIN) and the generation of aneuploidy. The kinetochore is a large complex of proteins and associated centromeric DNA that is responsible for mediating the segregation of sister chromatids to daughter cells via its interactions with the mitotic spindle. Continued identification of conserved kinetochore components in model systems such as yeast has provided a rich resource of candidate genes that may be mutated or misregulated in human cancers. Systematic mutational testing and transcriptional profiling of CIN candidate kinetochore genes should shed light on the kinetochore's role in tumorigenesis, and on the general role CIN plays in cancer development.
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Affiliation(s)
- Karen W Y Yuen
- Michael Smith Laboratories, University of British Columbia, 2185 East Mall, Vancouver, British Columbia, Canada V6T 1Z4
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40
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Roh M, Song C, Kim J, Abdulkadir SA. Chromosomal instability induced by Pim-1 is passage-dependent and associated with dysregulation of cyclin B1. J Biol Chem 2005; 280:40568-77. [PMID: 16221667 DOI: 10.1074/jbc.m509369200] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Overexpression of the oncogenic serine/threonine kinase Pim-1 has been shown to induce chromosomal missegregation and polyploidy in prostate epithelial cell lines (1). Here we demonstrated that Pim-1-induced polyploidy develops in a passage-dependent manner in culture consistent with a stochastic mode of progression. Induction of chromosomal instability by Pim-1 was not restricted to prostate cells as it was also observed in telomerase-immortalized normal human mammary epithelial cells. Elevated levels of cyclin B1 protein, but not its messenger RNA, were evident in early passage Pim-1 overexpressing cells, suggesting that increased cyclin B1 levels contribute to the development of polyploidy. Furthermore, regulation of cyclin B1 protein and cyclin B1/CDK1 activity after treatment with anti-microtubule agents was impaired. Small interfering RNA targeting cyclin B1 reversed the cytokinesis delay but not the mitotic checkpoint defect in Pim-1 overexpressing cells. These results indicated that chronic Pim-1 overexpression dysregulates cyclin B1 protein expression, which contributes to the development of polyploidy by delaying cytokinesis.
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Affiliation(s)
- Meejeon Roh
- Department of Pathology, The University of Alabama at Birmingham, School of Medicine, Birmingham, Alabama 35294, USA
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41
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Marriott SJ, Semmes OJ. Impact of HTLV-I Tax on cell cycle progression and the cellular DNA damage repair response. Oncogene 2005; 24:5986-95. [PMID: 16155605 DOI: 10.1038/sj.onc.1208976] [Citation(s) in RCA: 150] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Human T-cell lymphotropic virus type I (HTLV-I) is the etiologic agent of adult T-cell leukemia (ATL), a rapidly progressing, clonal malignancy of CD4+ T lymphocytes. Fewer than one in 20 infected individuals typically develop ATL and the onset of this cancer occurs after decades of relatively symptom-free infection. Leukemic cells from ATL patients display extensive and varied forms of chromosomal abnormalities and this genomic instability is thought to be a major contributor to the development of ATL. HTLV-I encodes a regulatory protein, Tax, which is necessary and sufficient to transform cells and is therefore considered to be the viral oncoprotein. Tax interacts with numerous cellular proteins to reprogram cellular processes including, but not limited to, transcription, cell cycle regulation, DNA repair, and apoptosis. This review presents an overview of the impact of HTLV-I infection in general, and Tax expression in particular, on cell cycle progression and the repair of DNA damage. The contribution of these activities to genome instability and cellular transformation will be discussed.
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Affiliation(s)
- Susan J Marriott
- Baylor College of Medicine, Department of Molecular Virology and Microbiology, One Baylor Plaza, Houston, TX 77030, USA.
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42
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Abstract
Abnormal chromosome content - also known as aneuploidy - is the most common characteristic of human solid tumours. It has therefore been proposed that aneuploidy contributes to, or even drives, tumour development. The mitotic checkpoint guards against chromosome mis-segregation by delaying cell-cycle progression through mitosis until all chromosomes have successfully made spindle-microtubule attachments. Defects in the mitotic checkpoint generate aneuploidy and might facilitate tumorigenesis, but more severe disabling of checkpoint signalling is a possible anticancer strategy.
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Affiliation(s)
- Geert J P L Kops
- Laboratory of Experimental Oncology, Department of Medical Oncology, University Medical Center, Utrecht, 3584 CG, The Netherlands.
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43
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Yen TJ, Kao GD. Mitotic checkpoint, aneuploidy and cancer. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2005; 570:477-499. [PMID: 18727512 DOI: 10.1007/1-4020-3764-3_17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Affiliation(s)
- Tim J Yen
- Fox Chase Cancer Center, Philadelphia, PA 19111, USA
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44
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Komarova NL, Wodarz D. The optimal rate of chromosome loss for the inactivation of tumor suppressor genes in cancer. Proc Natl Acad Sci U S A 2004; 101:7017-21. [PMID: 15105448 PMCID: PMC406458 DOI: 10.1073/pnas.0401943101] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Many cancers are characterized by chromosomal instability (CIN). This phenotype involves the deletion and duplication of chromosomes or chromosome parts and results in a high degree of aneuploidy. The role of CIN for cancer progression is a very important, yet unresolved question. It has been argued that CIN contributes to cancer initiation because chromosome loss can unmask a mutated tumor suppressor (TSP) gene. At the same time, CIN is costly for the cell because it destroys the genome and therefore compromises clonal expansion. Here, we use mathematical models to determine whether CIN can accelerate the generation and expansion of TSP(-/-) cells in the context of this tradeoff. Comparing cells with different degrees of CIN, we find that the emergence and growth of TSP(-/-) cells is optimized if the rate of chromosome loss is of the order of 10(-3) to 10(-2). This result is very robust, is independent of parameter values, and coincides with experimental measures using colon cancer cell lines. However, if we consider all of the steps in the pathway, including the generation of the CIN phenotype from stable cells, then it turns out that the emergence and growth of TSP(-/-) cells is never accelerated by CIN. Therefore, CIN does not arise because it accelerates the accumulation of adaptive mutations. Instead, it arises for other reasons, such as environmental factors, and is subsequently fine-tuned by selection to minimize the time to further cancer progression by means of the inactivation of TSP genes.
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Affiliation(s)
- Natalia L Komarova
- Department of Mathematics, Rutgers, The State University of New Jersey, 110 Frelinghuysen Road, Piscataway, NJ 08854, USA.
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45
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Abstract
Faithful chromosome segregation during each cell division is regulated by the spindle checkpoint. This surveillance mechanism monitors kinetochore-microtubule attachment and the integrity of the mitotic apparatus, delaying mitotic exit until all chromosomes are properly aligned at the metaphase plate. Failure of this mechanism can generate gross aneuploidy. Since its discovery, mutations in genes involved in the spindle checkpoint response were predicted to be serious candidates for the chromosomal instability phenotype observed in many tumors. During the last few years, significant advances have been made in understanding the molecular basis of the spindle checkpoint. However, many studies of tumor cell lines and primary cancer isolates have failed to show a direct correlation with mutations in spindle checkpoint components. Nevertheless, it was shown that many tumor cells have an abnormal spindle checkpoint. Therefore, better understanding of the molecular mechanisms involved in regulation of spindle checkpoint response are expected to provide important clues regarding the mechanisms underlying the emergence of neoplasia.
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Affiliation(s)
- Carla S Lopes
- Laboratório de Genética Molecular, Universidade do Porto, Portugal
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46
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Abstract
Adult T-cell leukemia (ATL) is one of the most aggressive hematologic malignancies and is caused by human T-cell leukemia virus type I (HTLV-I). Tax, encoded by the HTLV-I pX region, has been recognized by its pleiotropic actions as a critical accessory protein playing a central role in leukemogenesis. However, fresh ATL cells frequently lose Tax protein expression via several mechanisms, such as genetic and epigenetic changes in the provirus. Furthermore, there is a long latency period before the onset of ATL, indicating the multistep mechanisms of leukemogenesis. Therefore, additional factors, including other viral proteins, genetic and epigenetic changes of the host genome, and alterations in the gene expression and immune systems of the host cells, may be implicated in ATL leukemogenesis. This review summarizes recent advances in the understanding of ATL leukemogenesis.
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47
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Gupta A, Inaba S, Wong OK, Fang G, Liu J. Breast cancer-specific gene 1 interacts with the mitotic checkpoint kinase BubR1. Oncogene 2003; 22:7593-9. [PMID: 14576821 DOI: 10.1038/sj.onc.1206880] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The abnormal expression of breast cancer-specific gene 1 (BCSG1) in malignant mammary epithelial cells is highly associated with the development and progression of breast cancer. A series of in vitro and in vivo studies performed in our laboratory and others have demonstrated that BCSG1 expression significantly stimulates proliferation, invasion, and metastasis of breast cancer cells. However, currently little is known about how BCSG1 exerts its oncogenic functions. To elucidate the cellular mechanisms underlying the effects of BCSG1 in breast cancer cells, we used a yeast two-hybrid system to screen for proteins that could associate with BCSG1. Through this screening, we identified the mitotic checkpoint protein BubR1 as a novel binding partner of BCSG1. The specific association of BCSG1 with BubR1 in breast cancer cells was demonstrated by immunoprecipitation and GST pull-down assays. Intriguingly, experiments conducted in four different cell lines all showed that exogenous expressions of BCSG1 consistently reduce the cellular levels of the BubR1 protein without affecting BubR1 mRNA expression. The tendency of endogenous BCSG1 expression coinciding with lower BubR1 protein levels was also observed in seven out of eight breast cancer cell lines. We further showed that the reducing effect of BCSG1 on BubR1 protein expression could be prevented by treating BCSG1-transfected cells with MG-132, a selective 26S proteasome inhibitor, implying that the proteasome machinery may be involved in the BCSG1-induced reduction of the BubR1 protein. Accompanied with a reduction of BubR1 protein level, BCSG1 expression resulted in multinucleation of breast cancer cells upon treatment with spindle inhibitor nocodazole, indicating an impaired mitotic checkpoint. Taken together, our novel findings suggest that BCSG1 may accelerate the progression of breast cancer at least in part by compromising the mitotic checkpoint control through inactivation of BubR1.
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Affiliation(s)
- Anu Gupta
- Department of Veterans Affairs Palo Alto Health Care System, Palo Alto, CA 94304, USA
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48
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Franchini G, Fukumoto R, Fullen JR. T-Cell Control by Human T-Cell Leukemia/Lymphoma Virus Type 1. Int J Hematol 2003; 78:280-96. [PMID: 14686485 DOI: 10.1007/bf02983552] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Human T-cell leukemia/lymphoma virus type 1 (HTLV-1) causes neoplastic transformation of human T-cells in a small number of infected individuals several years from infection. Collective evidence from in vitro studies indicates that several viral proteins act in concert to increase the responsiveness of T-cells to extracellular stimulation, modulate proapoptotic and antiapoptotic gene signals, enhance T-cell survival, and avoid immune recognition of the infected T-cells. The virus promotes T-cell proliferation by usurping several signaling pathways central to immune T-cell function, such as antigen stimulation and receptor-ligand interaction, suggesting that extracellular signals are important for HTLV-1 oncogenesis. Environmental factors such as chronic antigen stimulation may therefore be of importance, as also suggested by epidemiological data. Thus genetic and environmental factors together with the virus contribute to disease development. This review focuses on current knowledge of the mechanisms regulating HTLV-1 replication and the T-cell pathways that are usurped by viral proteins to induce and maintain clonal proliferation of infected T-cells. The relevance of these laboratory findings is related to clonal T-cell proliferation and adult T-cell leukemia/lymphoma development in vivo.
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Affiliation(s)
- Genoveffa Franchini
- Basic Research Laboratory, National Cancer Institute, Bethesda, Maryland 20892-5055, USA.
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49
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Rajagopalan H, Nowak MA, Vogelstein B, Lengauer C. The significance of unstable chromosomes in colorectal cancer. Nat Rev Cancer 2003; 3:695-701. [PMID: 12951588 DOI: 10.1038/nrc1165] [Citation(s) in RCA: 326] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A very large fraction of cancers have an abnormal genetic content, called aneuploidy, which is characterized by changes in chromosome structure and number. One explanation for this aneuploidy is chromosomal instability, in which cancer cells gain or lose whole chromosomes or large fractions of chromosomes at a greatly increased rate compared with normal cells. Here, we explore experimental and theoretical evidence for the initiation of chromosomal instability in very early colorectal cancers, and reflect on the role that chromosomal instability could have in colorectal tumorigenesis.
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Affiliation(s)
- Harith Rajagopalan
- Sidney Kimmel Comprehensive Cancer Center and Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231, USA
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Baek KH, Shin HJ, Yoo JK, Cho JH, Choi YH, Sung YC, McKeon F, Lee CW. p53 deficiency and defective mitotic checkpoint in proliferating T lymphocytes increase chromosomal instability through aberrant exit from mitotic arrest. J Leukoc Biol 2003; 73:850-61. [PMID: 12773518 DOI: 10.1189/jlb.1202607] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
During the proliferation of T cells for successful immune responses against pathogens, the fine regulation of cell cycle is important to the maintenance of T cell homeostasis and the prevention of lymphoproliferative disorders. However, it remains to be elucidated how the cell cycle is controlled at the mitotic phase in proliferating T cells. Here, we show that during the proliferation of primary T cells, the disruption of the mitotic spindle leads to cell-cycle arrest at mitosis and that prolonged mitotic arrest results in not only apoptosis but also the form of chromosomal instability observed in human cancers. It is interesting that in response to spindle damage, the phosphorylation of BubR1, a mitotic checkpoint kinase, was significantly induced in proliferating T cells, and the expression of the dominant-negative mutant of BubR1 compromised mitotic arrest and subsequent apoptosis and thus led to the augmentation of polyploidy formation. We also show that in response to prolonged spindle damage, the expression of p53 but not of p73 was significantly induced. In addition, following sustained mitotic arrest, p53-deficient T cells were found to be more susceptible to polyploidy formation than the wild type. These results suggest that during flourishing immune response, mitotic checkpoint and p53 play important roles in the prevention of chromosomal instability and in the maintenance of the genomic integrity of proliferating T cells.
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Affiliation(s)
- Kwan-Hyuck Baek
- National Research Laboratory of DNA Medicine, Division of Molecular and Life Sciences, Pohang University of Science and Technology, Korea
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