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Hu P, Wang B, Chen T, Xu Y, Zheng G, Zhu Y, Du X. RNA polymerase II subunit 3 regulates vesicular, overexpressed in cancer, prosurvival protein 1 expression to promote hepatocellular carcinoma. J Int Med Res 2021; 49:300060521990512. [PMID: 33845647 PMCID: PMC8047087 DOI: 10.1177/0300060521990512] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 01/05/2021] [Indexed: 12/12/2022] Open
Abstract
OBJECTIVE To explore the relationships between hepatocellular carcinoma (HCC) and the expression of RNA polymerase II subunit 3 (RPB3) and vesicular, overexpressed in cancer, prosurvival protein 1 (VOPP1), and to determine whether RPB3 regulates VOPP1 expression to promote HCC cell proliferation, tumor growth, and tumorigenesis. METHODS HCC and adjacent liver samples were collected from 51 patients with HCC who underwent surgical excision between September 20, 2010 and June 22, 2017. Immunohistochemical staining, western blot, quantitative PCR, plate colony assay, and RNA microarray were used to detect relevant indexes for further analyses. RESULTS VOPP1 was shown to function as a target gene of RPB3 in facilitating HCC proliferation, and was downregulated after RBP3 silencing. Additionally, hepatic tumor tissues demonstrated high VOPP1 expression. Furthermore, VOPP1 silencing suppressed tumor growth and cell proliferation and elicited apoptosis. CONCLUSION RPB3 regulates VOPP1 expression to promote HCC cell proliferation, tumor growth, and tumorigenesis.
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Affiliation(s)
- Peng Hu
- Department of Hepatobiliary Surgery, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Linhai, Zhejiang, China
| | - Binfeng Wang
- Department of Hepatobiliary Surgery, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Linhai, Zhejiang, China
| | - Ting Chen
- Department of Hepatobiliary Surgery, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Linhai, Zhejiang, China
| | - Yongfu Xu
- Department of Hepatobiliary Surgery, Enze Hospital,Wenzhou Medical University, Taizhou, Zhejiang, China
| | - Guoqun Zheng
- Department of Hepatobiliary Surgery, Enze Hospital,Wenzhou Medical University, Taizhou, Zhejiang, China
| | - Yu Zhu
- Department of Hepatobiliary Surgery, Enze Hospital,Wenzhou Medical University, Taizhou, Zhejiang, China
| | - Xuefeng Du
- Department of Hepatobiliary Surgery, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Linhai, Zhejiang, China
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Fang ZP, Jiang BG, Zhang FB, Wang AD, Ji YM, Xu YF, Li JC, Zhou WP, Zhou WJ, Han HX. Rpb3 promotes hepatocellular carcinoma through its N-terminus. Oncotarget 2015; 5:9256-68. [PMID: 25211001 PMCID: PMC4253432 DOI: 10.18632/oncotarget.2389] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The expression of RNA polymerase II subunit 3 (Rpb3) was found frequent up-regulation in Hepatocellular carcinoma (HCC) tumors. Significant associations could also be drawn between increased expressions of Rpb3 and advance HCC staging and shorter disease-free survival of patients. Overexpression of Rpb3 increased HCC cell proliferation, migratory rate and tumor growth in nude mice, whereas suppression of Rpb3 using shRNA inhibited these effects. For mechanism study, we found that Rpb3 bound directly to Snail, downregulated E-cadherin, induced HCC cells epithelial-mesenchymal transition (EMT). In particular, N-terminus of Rpb3 blocked Rpb3 binding to Snail, inhibited Rpb3-high-expression HCC cells proliferation, migration, tumor growth in nude mice, and also inhibited DEN-induced liver tumorigenesis. Furthermore, N-terminus of Rpb3 did not inhibit normal liver cells or Rpb3-low-expression HCC cells proliferation. These findings suggest that N-terminus of Rpb3 selectively inhibits Rpb3-high-expression HCC cells proliferation. N-terminus of Rpb3 may be useful in treating patients diagnosed with Rpb3-high-expression HCC.
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Affiliation(s)
- Zhe-Ping Fang
- Department of Hepatobiliary Surgery, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Linhai 317000, China
| | - Bei-Ge Jiang
- Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China
| | - Fa-Biao Zhang
- Department of Hepatobiliary Surgery, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Linhai 317000, China
| | - Ai-Dong Wang
- Department of Hepatobiliary Surgery, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Linhai 317000, China
| | - Yi-Ming Ji
- Department of Hepatobiliary Surgery, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Linhai 317000, China
| | - Yong-Fu Xu
- Department of Hepatobiliary Surgery, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Linhai 317000, China
| | - Ji-Cheng Li
- Institute of Cell Biology, Zhejiang University, 866 Yu-Hang-Tang Road, Hangzhou 310058, China
| | - Wei-Ping Zhou
- Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China
| | - Wei-Jie Zhou
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, MI 48109, USA
| | - Hai-Xiong Han
- Department of Hepatobiliary Surgery, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Linhai 317000, China
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Nadkar A, Pungaliya C, Drake K, Zajac E, Singhal SS, Awasthi S. Therapeutic resistance in lung cancer. Expert Opin Drug Metab Toxicol 2006; 2:753-77. [PMID: 17014393 DOI: 10.1517/17425255.2.5.753] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Despite considerable progress over the last 25 years in the systemic therapy of lung cancer, intrinsic and acquired resistance to chemotherapeutic agents and radiation remains a vexing problem. The number of mechanisms of therapeutic resistance in lung cancer has expanded considerably over the past three decades, and the crucial role of stress resistance pathways is increasingly recognised as a cause of intrinsic and acquired chemo- and radiotherapy resistance. This paper reviews recent evidence for stress defence proteins, particularly RALBP1/RLIP76, in mediating intrinsic and acquired chemotherapy and radiation resistance in human lung cancer.
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Affiliation(s)
- Aalok Nadkar
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, CPB # 351, 76019-0065, USA.
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Takramah D, Seiffert BM, Schaller S, Vigneron M, Häcker G. Baculovirus P35 interacts with a subunit of human RNA polymerase II and can enhance promoter activity in human cells. J Gen Virol 2003; 84:3011-3019. [PMID: 14573806 DOI: 10.1099/vir.0.19395-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The early protein P35 from the baculovirus Autographa californica nucleopolyhedrovirus is a direct inhibitor of caspases and can block apoptosis in a wide variety of systems. In addition, it has been linked to the regulation of viral gene expression, shut-down of protein synthesis in infected insect cells and malignant transformation of mouse fibroblasts. By yeast-two-hybrid screening we identified the RPB11a subunit of human RNA polymerase II as an interaction partner of P35. Specificity of the interaction was confirmed by affinity blotting. By immunocytology, P35 was in part found in the nucleus of transfected cells. Homology searches further revealed that P35 has structural similarity with RPB3, the subunit of RNA polymerase II that has been demonstrated to interact directly with RPB11a. When transfected into human colon carcinoma cells, P35 was able to enhance the activity of E-cadherin and beta-actin promoters by about a factor of two as measured by luciferase reporter assay. P35 and hRPB11a together enhanced the E-cadherin activity about three- to fourfold. These data suggest an additional role for P35 in the regulation of cellular transcription.
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Affiliation(s)
- David Takramah
- Institute for Medical Microbiology, Immunology and Hygiene, Technische Universität München, Trogerstr. 9, D-81675 Munich, Germany
| | - Barbara M Seiffert
- Institute for Medical Microbiology, Immunology and Hygiene, Technische Universität München, Trogerstr. 9, D-81675 Munich, Germany
| | - Sophie Schaller
- Institut de Genetique et de Biologie Moleculaire et Cellulaire (CNRS/INSERM/ULP), Illkirch, France
| | - Marc Vigneron
- Institut de Genetique et de Biologie Moleculaire et Cellulaire (CNRS/INSERM/ULP), Illkirch, France
| | - Georg Häcker
- Institute for Medical Microbiology, Immunology and Hygiene, Technische Universität München, Trogerstr. 9, D-81675 Munich, Germany
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De Angelis R, Iezzi S, Bruno T, Corbi N, Di Padova M, Floridi A, Fanciulli M, Passananti C. Functional interaction of the subunit 3 of RNA polymerase II (RPB3) with transcription factor-4 (ATF4). FEBS Lett 2003; 547:15-9. [PMID: 12860379 DOI: 10.1016/s0014-5793(03)00659-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
RPB3 is a core subunit of RNA polymerase II (pol II) that, together with the RPB11 subunit, forms the heterodimer considered as a functional counterpart of the bacterial alpha subunit homodimer involved in promoter recognition. We previously employed the yeast two-hybrid system and identified an interaction between RPB3 and the myogenic transcription factor myogenin, demonstrating an involvement of this subunit in muscle differentiation. In this paper we report the interaction between RPB3 and another known transcription factor, ATF4. We found that the intensity of the interaction between RPB3 and ATF4 is similar to the one between RPB3 and myogenin. This interaction involves an RPB3 specific region not homologous to the prokaryotic alpha subunit. We demonstrated that RBP3 is able to enhance ATF4 transactivation, whereas the region of RPB3 (Sud) that contacts ATF4, when used as a dominant negative, markedly inhibits ATF4 transactivation activity. Interestingly, ATF4 protein level, as reported for its partner RPB3, increases during C2C7 cell line muscle differentiation.
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Affiliation(s)
- Roberta De Angelis
- Laboratory B, Regina Elena Cancer Institute, Via delle Messi d'Oro 156, 00158, Rome, Italy
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Kuniyasu H, Yasui W, Pettaway CA, Yano S, Oue N, Tahara E, Fidler IJ. Interferon-alpha prevents selection of doxorubicin-resistant undifferentiated-androgen-insensitive metastatic human prostate cancer cells. Prostate 2001; 49:19-29. [PMID: 11550207 DOI: 10.1002/pros.1114] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND We determined whether treatment of metastatic prostate cancer cells with doxorubicin (DOX) and interferon-alpha (IFN-alpha) prevented the emergence of highly undifferentiated tumor cells. METHODS The state of cell differentiation was determined by analysis of prostate-specific antigen (PSA), E-cadherin, keratin, and vimentin. RESULTS Human prostate cancer LNCaP-LN3 cells growing in culture as multicell spheroids expressed higher levels of E-cadherin and E-cadherin-associated beta-catenin than LNCaP-LN3 cells growing as monolayers. Treatment of cells with DOX downregulated PSA, E-cadherin, and keratin, and upregulated expression of vimentin and vascular endothelial growth factor (VEGF) mRNA. While treatment of cells with IFN-alpha did not alter gene expression, the addition of IFN-alpha to cultures treated with DOX produced synergistic toxicity and abrogated the changes in gene expression observed in cells treated with DOX alone. CONCLUSIONS Treatment with IFN-alpha and DOX should be further explored as a therapeutic strategy for androgen-insensitive prostate cancer.
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Affiliation(s)
- H Kuniyasu
- Department of Oncological Pathology, Cancer Center, Nara Medical University, Kashihara, Japan
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Fanciulli M, Bruno T, Di Padova M, De Angelis R, Iezzi S, Iacobini C, Floridi A, Passananti C. Identification of a novel partner of RNA polymerase II subunit 11, Che-1, which interacts with and affects the growth suppression function of Rb. FASEB J 2000; 14:904-12. [PMID: 10783144 DOI: 10.1096/fasebj.14.7.904] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
hRPB11 is a core subunit of RNA polymerase II (pol II) specifically down-regulated on doxorubicin (dox) treatment. Levels of this protein profoundly affect cell differentiation, cell proliferation, and tumorigenicity in vivo. Here we describe Che-1, a novel human protein that interacts with hRPB11. Che-1 possesses a domain of high homology with Escherichia coli RNA polymerase final sigma-factor 70 and SV40 large T antigen. In addition, we report that Che-1 interacts with the retinoblastoma susceptibility gene (Rb) by two distinct domains. Functionally, we demonstrate that Che-1 represses the growth suppression function of Rb, counteracting the inhibitory action of Rb on the trans-activation function of E2F1. These results identify a novel protein that binds Rb and the core of pol II, and suggest that Che-1 may be part of transcription regulatory complex.
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Affiliation(s)
- M Fanciulli
- Cell Metabolism and Pharmacokinetics Laboratory, Regina Elena Cancer Institute, 00158 Rome, Italy
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Bruno T, Corbi N, Di Padova M, De Angelis R, Floridi A, Passananti C, Fanciulli M. The RNA polymerase II core subunit 11 interacts with keratin 19, a component of the intermediate filament proteins. FEBS Lett 1999; 453:273-7. [PMID: 10405159 DOI: 10.1016/s0014-5793(99)00733-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
We have previously cloned the human RNA polymerase II subunit 11, as a doxorubicin sensitive gene product. We suggested multiple tasks for this subunit, including structural and regulatory roles. With the aim to clarify the human RNA polymerase II subunit 11 function, we have identified its interacting protein partners using the yeast two-hybrid system. Here, we show that human RNA polymerase II subunit 11 specifically binds keratin 19, a component of the intermediate filament protein family, which is expressed in a tissue and differentiation-specific manner. In particular, keratin 19 is a part of the nuclear matrix intermediate filaments. We provide evidence that human RNA polymerase II subunit 11 interacts with keratin 19 via its N-terminal alpha motif, the same motif necessary for its interaction with the human RNA polymerase II core subunit 3. We found that keratin 19 contains two putative leucine zipper domains sharing peculiar homology with the alpha motif of human RNA polymerase II subunit 3. Finally, we demonstrate that keratin 19 can compete for binding human RNA polymerase II subunit 11/human RNA polymerase II subunit 3 in vitro, suggesting a possible regulatory role for this molecule in RNA polymerase II assembly/activity.
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Affiliation(s)
- T Bruno
- Cell Metabolism and Pharmacokinetics Laboratory, Regina Elena Cancer Institute, Rome, Italy
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