1
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Zeng XX, Guo WW, Shen J, Jiang YY, Liu S, Zhang XH. REGγ promotes mantle cell lymphoma cell apoptosis by downregulating NF-κB signaling. Transl Cancer Res 2023; 12:310-320. [PMID: 36915576 PMCID: PMC10007892 DOI: 10.21037/tcr-22-2045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Accepted: 12/16/2022] [Indexed: 02/17/2023]
Abstract
Background Mantle cell lymphoma (MCL) is an aggressive B-cell non-Hodgkin lymphoma (NHL). REGγ is important for tumor occurrence and development, but understanding of the specific role of REGγ in MCL is lacking. We aimed to identify REGγ effects on the proliferation and apoptosis of MCL cells and clarify the underlying mechanisms. Methods JEKO-1 cells stably transfected with a doxycycline-inducible Tet-On system expressed high levels of REGγ. JEKO-1 cells stably expressing shRNA-REGγ to reduce REGγ levels were constructed. Cell proliferation, apoptosis, and p-NF-κB, NF-κB, IkB, REGγ, p-STAT3, STAT3, and PSMB5 levels in transfected cells and in transfected cells treated with Stattic, that is a nonpeptidic small molecule exhibited to selectively inhibit signal transducer and activator of transcription factor 3 through blocking the function of its SH2 domain, were analyzed using western blotting. Results The proliferation of JEKO-1 cells was inhibited, and apoptosis was enhanced by increased expression of REGγ (P<0.01). REGγ inhibited MCL cell proliferation in a mouse tumor xenograft model by promoting apoptosis, increased the expression of the three IκB subunits and inhibited NF-κB signaling. Overexpressed REGγ inhibited STAT3 and downregulated PSMB5 expression in MCL cells. Stattic downregulated PSMB5 and nuclear factor-kappa B (NF-κB) expressions and upregulated IκBε expression in JEKO-1 cells. Conclusions We found that REGγ regulated p-STAT3 expression by accelerating its half-life and downregulated the NF-κB signaling pathway to promote MCL cell apoptosis by negatively regulating STAT3-mediated PSMB5 expression and subsequently upregulating IκB expression.
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Affiliation(s)
- Xin-Xin Zeng
- Second Department of Oncology, Guangdong Second Provincial General Hospital, School of Medicine, Jinan University, Guangzhou, China
| | - Wan-Wei Guo
- Department of Gastroenterology, The Affiliated Guangdong Second Provincial General Hospital of Jinan University, Guangzhou, China
| | - Ju Shen
- Second Department of Oncology, Guangdong Second Provincial General Hospital, School of Medicine, Jinan University, Guangzhou, China.,Guangdong Medical University, Zhanjiang, China
| | - Yu-Ying Jiang
- Second Department of Oncology, Guangdong Second Provincial General Hospital, School of Medicine, Jinan University, Guangzhou, China.,Guangdong Medical University, Zhanjiang, China
| | - Shuang Liu
- Department of Hematology, The Affiliated Guangdong Second Provincial General Hospital of Jinan University, Guangzhou, China
| | - Xu-Hui Zhang
- Second Department of Oncology, Guangdong Second Provincial General Hospital, School of Medicine, Jinan University, Guangzhou, China
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2
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Zhu X, Yang M, Lin Z, Mael SK, Li Y, Zhang L, Kong Y, Zhang Y, Ren Y, Li J, Wang Z, Zhang Y, Yang B, Huang T, Guan F, Li Z, Moses RE, Li L, Wang B, Li X, Zhang B. REGγ drives Lgr5 + stem cells to potentiate radiation induced intestinal regeneration. Sci China Life Sci 2021; 65:1608-1623. [PMID: 34826093 DOI: 10.1007/s11427-021-2018-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 10/19/2021] [Indexed: 12/22/2022]
Abstract
Leucine-rich repeat containing G protein-coupled receptor 5 (Lgr5), a marker of intestinal stem cells (ISCs), is considered to play key roles in tissue homoeostasis and regeneration after acute radiation injury. However, the activation of Lgr5 by integrated signaling pathways upon radiation remains poorly understood. Here, we show that irradiation of mice with whole-body depletion or conditional ablation of REGγ in Lgr5+ stem cell impairs proliferation of intestinal crypts, delaying regeneration of intestine epithelial cells. Mechanistically, REGγ enhances transcriptional activation of Lgr5 via the potentiation of both Wnt and Hippo signal pathways. TEAD4 alone or cooperates with TCF4, a transcription factor mediating Wnt signaling, to enhance the expression of Lgr5. Silencing TEAD4 drastically attenuated β-catenin/TCF4 dependent expression of Lgr5. Together, our study reveals how REGγ controls Lgr5 expression and expansion of Lgr5+ stem cells in the regeneration of intestinal epithelial cells. Thus, REGγ proteasome appears to be a potential therapeutic target for radiation-induced gastrointestinal disorders.
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Affiliation(s)
- Xiangzhan Zhu
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China
- Department of Neonatology, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China
| | - Minglei Yang
- Department of Orthopedic Oncology, Changzheng Hospital, the Second Military Medical University, Shanghai, 200003, China
| | - Zaijun Lin
- Department of Spinal Surgery, Shidong Hospital, Yangpu District, Shidong Hospital Affiliated to University of Shanghai for Science and Technology, Shanghai, 200438, China
| | - Solomon Kibreab Mael
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Ya Li
- Henan Key Laboratory for Helicobacter pylori & Microbiota and GI cancer, Marshall Medical Research Center, The Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Lili Zhang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Yaqi Kong
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Yaodong Zhang
- Department of Neonatology, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, 450018, China
| | - Yuping Ren
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Jianhui Li
- Department of Pathology, Xuchang Central Hospital Affiliated to Henan University of Science and Technology, Xuchang, 461000, China
| | - Zimeng Wang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Ying Zhang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Bo Yang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Tingmei Huang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Fangxia Guan
- School of Life Sciences, Zhengzhou University, Zhengzhou, 450001, China
| | - Zhenlong Li
- Department of Hematology & Hematopoietic Cell Transplantation, City of Hope National Medical Center, Los Angeles, CA, 91010, USA
| | - Robb E Moses
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Lei Li
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Bing Wang
- Department of Oncological Surgery, Minhang Branch, Shanghai Cancer Center, Fudan University, Shanghai, 200240, China.
| | - Xiaotao Li
- Changning Maternity and Infant Health Hospital, East China Normal University, Shanghai, 20051, China.
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China.
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, 77030, USA.
| | - Bianhong Zhang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai, 200241, China.
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3
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Gao X, Wang Q, Yuan L, Jiao C, Yu Y, Wang X, Xu P, Ma Y, Wu Y, Wu Z, Li L, Xiao J, Dang Y. REGγ regulates hair cycle by activating Lgr5 positive hair follicle stem cells. J Dermatol Sci 2021; 102:101-8. [PMID: 33933312 DOI: 10.1016/j.jdermsci.2021.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 03/27/2021] [Accepted: 04/12/2021] [Indexed: 01/14/2023]
Abstract
BACKGROUND REGγ acts as a proteasome activating factor mediating proteasome degradation of substrate proteins in an ATP and ubiquitination independent manner and also as an important regulator of cell cycle, proliferation and apoptosis. Hair cycle involves dynamic, continuous morphological changes of three stages (anagen, catagen and telogen). OBJECTIVE The function of REGγ in hair cycling is still unclear. METHODS Here, we used REGγ knockout 293 T cells, inducible 293WT and 293N151Y cell, REGγ knockout mice to identify the novel molecular mechanism of REGγ in regulating hair follicle stem cells. RESULTS In the present study, we found that REGγ deletion markedly delayed the transition of hair follicles from telogen to anagen and hair regeneration in mice. We also observed significant decrease of hair follicle stem cell number, stem-like property and proliferation ability. Interestingly, the results from real-time PCR, FACS, Western Blot and immunofluorescent analysis showed that REGγ deletion could greatly downregulate Lgr5 expression in the hair follicles. Meanwhile, REGγ was demonstrated to directly interact with LHX2 and promotes its degradation. Importantly, REGγ specific deletion in Lgr5+ stem cells induced the marked delay of hair regeneration after depilation. CONCLUSION These data together indicate that REGγ was a new mediator of Lgr5 expression in hair follicle at least partly by promoting the degradation of its suppressive transcription factor LHX2. It seemed that REGγ regulated hair anagen entry and hair regrowth by activating Lgr5 positive hair follicle stem cells.
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4
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Shen M, Wang Q, Xu S, Chen G, Xu H, Li X, Zhao S. Role of oncogenic REGγ in cancer. Biomed Pharmacother 2020; 130:110614. [PMID: 32935661 DOI: 10.1016/j.biopha.2020.110614] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 08/01/2020] [Accepted: 08/02/2020] [Indexed: 12/24/2022] Open
Abstract
Cancer is a critical global health-care problem with limited therapeutic options. Since cancers are life-threatening illnesses, the identification of a promising oncotarget and its clinical correlates are relevant. Mounting evidence has emerged indicating that REG gamma (REGγ), a member of the 11S proteasome activators, plays a pivotal role in the development of multiple human cancers. However, an elaborate summary on the association between REGγ and cancer is still lacking. In this Review, we discuss how REGγ, through its ATP- and ubiquitin-independent manners, represents a promising cancer biomarker and therapeutic oncotarget for multiple human cancers. Aberrant REGγ expression closely associated with tumorigenesis attributes to its biological functions for controlling and regulating cell cycle, proliferation, migration, invasion, angiogenesis, and metastasis of the cancer cells by degrading proteins of cytosol and nucleus in the eukaryotic cells. REGγ serves as a molecular switch to activate multifarious oncogenic signaling pathways, such as MAPK/p38, TGF-β/Smad, and Wnt/β-catenin. The review describes that targeting REGγ may provide new diagnostic and therapeutic applications in cancer.
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Affiliation(s)
- Maolei Shen
- Department of Urology, Taizhou Central Hospital (Taizhou University Hospital), Taizhou, 318000, Zhejiang, China
| | - Qinzhang Wang
- Department of Urology, The First Affiliated Hospital of Shihezi University Medical School, Shihezi, China
| | - Shuaijun Xu
- Hebei North University, Zhangjiakou, 075000, Hebei, China
| | - Guang Chen
- Department of Pharmacology, School of Medicine, Taizhou University, Taizhou, 318000, Zhejiang, China
| | - Hao Xu
- Health Company, 69235, Army of PLA, China
| | - Xin Li
- Department of Urology, Taizhou Central Hospital (Taizhou University Hospital), Taizhou, 318000, Zhejiang, China
| | - Shankun Zhao
- Department of Urology, Taizhou Central Hospital (Taizhou University Hospital), Taizhou, 318000, Zhejiang, China.
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5
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Zhou L, Yao L, Zhang Q, Xie W, Wang X, Zhang H, Xu J, Lin Q, Li Q, Xuan Y, Ji L, Wang L, Wang W, Wang W, Shi T, Fang L, Zheng B, Li L, Liu S, Zhang B, Li X. REGγ controls Th17 cell differentiation and autoimmune inflammation by regulating dendritic cells. Cell Mol Immunol 2020; 17:1136-47. [PMID: 31511643 DOI: 10.1038/s41423-019-0287-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 08/18/2019] [Indexed: 12/19/2022] Open
Abstract
Interleukin-17A (IL-17A)-producing helper T (Th17) cells are a subset of CD4+ T cells that play important pathological roles in autoimmune diseases. Although the intrinsic pathways of Th17 cell differentiation have been well described, how instructive signals derived from the innate immune system trigger the Th17 response and inflammation remains poorly understood. Here, we report that mice deficient in REGγ, a proteasome activator belonging to the 11S family, exhibit significantly deteriorated autoimmune neuroinflammation in an experimental autoimmune encephalomyelitis (EAE) model with augmented Th17 cell polarization in vivo. The results of the adoptive transfer of CD4+ T cells or dendritic cells (DCs) suggest that this phenotype is driven by DCs rather than T cells. Furthermore, REGγ deficiency promotes the expression of integrin αvβ8 on DCs, which activates the maturation of TGF-β1 to enhance Th17 cell development. Mechanistically, this process is mediated by the REGγ-proteasome-dependent degradation of IRF8, a transcription factor for αvβ8. Collectively, our findings delineate a previously unknown mechanism by which REGγ-mediated protein degradation in DCs controls the differentiation of Th17 cells and the onset of an experimental autoimmune disease.
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6
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Bhatti MZ, Pan L, Wang T, Shi P, Li L. REGγ potentiates TGF-β/Smad signal dependent epithelial-mesenchymal transition in thyroid cancer cells. Cell Signal 2019; 64:109412. [PMID: 31491459 DOI: 10.1016/j.cellsig.2019.109412] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Revised: 09/02/2019] [Accepted: 09/03/2019] [Indexed: 02/08/2023]
Abstract
Thyroid cancer is the most common endocrine cancer with an increasing incidence and mortality. Epithelial-mesenchymal transition (EMT) is a biological process contributing to tumor progression, metastasis, and the acquisition of chemotherapy resistance. The impact of the REGγ proteasome activator on EMT in human thyroid cancer cells and the molecular mechanism is still unclear. Here, we found silencing REGγ in thyroid cancer cells inhibited cell migration and invasion, with concurrent upregulation of E-cadherin and Smurf2 expression. Mechanistically, REGγ dependent regulation of Smurf2, an E3 ligase for Smad3, contributed to alteration of Zeb1/2, Snail, Slug, and Twist. Consistently, TGF-β mediated suppression of E-cadherin was attenuated in REGγ deficient cells, coupled with changes in cell morphology, migration and invasion. Furthermore, xenograft metastasis mouse model showed a reduced E-cadherin expression at both mRNA and protein levels, and decreased cell migration. Taken together, our findings provided an important evidence for the role of REGγ in tumor suppression, thereby implicating REGγ as a potential anti-cancer strategy in thyroid cancer therapy.
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Affiliation(s)
- Muhammad Zeeshan Bhatti
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 200241 Shanghai, China
| | - Linian Pan
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 200241 Shanghai, China
| | - Tianzhen Wang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 200241 Shanghai, China
| | - Peilin Shi
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 200241 Shanghai, China
| | - Lei Li
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 200241 Shanghai, China.
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7
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Gao X, Chen H, Liu J, Shen S, Wang Q, Clement TM, Deskin BJ, Chen C, Zhao D, Wang L, Guo L, Ma X, Zhang B, Xu Y, Li X, Li L. The REGγ-Proteasome Regulates Spermatogenesis Partially by P53-PLZF Signaling. Stem Cell Reports 2019; 13:559-571. [PMID: 31402338 PMCID: PMC6742627 DOI: 10.1016/j.stemcr.2019.07.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 07/10/2019] [Accepted: 07/15/2019] [Indexed: 01/05/2023] Open
Abstract
Development of spermatogonia and spermatocytes are the critical steps of spermatogenesis, impacting on male fertility. Investigation of the related regulators benefits the understanding of male reproduction. The proteasome system has been reported to regulate spermatogenesis, but the mechanisms and key contributing factors in vivo are poorly explored. Here we found that ablation of REGγ, a proteasome activator, resulted in male subfertility. Analysis of the mouse testes after birth showed there was a decreased number of PLZF+ spermatogonia and spermatocytes. Molecular analysis found that REGγ loss significantly increased the abundance of p53 protein in the testis, and directly repressed PLZF transcription in cell lines. Of note, allelic p53 haplodeficiency partially rescued the defects in spermatogenesis observed in REGγ-deficient mice. In summary, our results identify REGγ-p53-PLZF to be a critical pathway that regulates spermatogenesis and establishes a new molecular link between the proteasome system and male reproduction. REGγ loss results in male subfertility REGγ loss results in a decrease of spermatocytes and PLZF+ spermatogonial cells p53 protein, increased in REGγ−/− mouse testes, represses PLZF expression Allelic p53 haplodeficiency partially rescues defects in REGγ−/− mouse spermatogenesis
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Affiliation(s)
- Xiao Gao
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Hui Chen
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Jian Liu
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Shihui Shen
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Qingwei Wang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Tracy M Clement
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, USA
| | - Brian J Deskin
- Epigenetic & Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
| | - Caiyu Chen
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Dengpan Zhao
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Lu Wang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Linjie Guo
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Xueqing Ma
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Bianhong Zhang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Yunfei Xu
- Department of Urology, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, China
| | - Xiaotao Li
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Lei Li
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
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8
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Xie Y, Li X, Ge J. Expression of REGγ in atherosclerotic plaques and promotes endothelial cells apoptosis via the cyclophilin A pathway indicates functional implications in atherogenesis. Cell Cycle 2019; 18:2083-2098. [PMID: 31282281 DOI: 10.1080/15384101.2019.1639304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
REGγ is a member of the 11S regulatory particles family of proteasome activators and has been shown to promote the degradation of intact cellular proteins in a ubiquitin- and ATP-independent manner in the progression of various diseases. Our previous studies showed that REGγ-proteasome promotes Protein kinase A catalytic subunit α (PKAcα) turnover to modulate Forkhead box protein O1 (FoxO1) cellular activity in vascular endothelial cell migration and angiogenesis. We, therefore, studied the expression and novel functional implications and pathways involving REGγ in atherogenesis. We studied the expression of REGγ in atherosclerotic plaques in the ApoE-/- mouse model. Using immunohistochemistry, we showed that REGγ was highly expressed in these plaques, and the result of RNA-seq in Human umbilical vein endothelial cells (HUVECs), led us to explore and indentify that REGγ significantly promoted cyclophilin A (CyPA) expression, which is a proinflammatory and proapoptotic molecule in atherosclerosis progression. Next, we studied the regulation of REGγ in CyPA expression, and the proapoptotic effect on Endothelial cells (ECs). REGγ promoted CyPA expression via the REGγ-PKA-FoxO1-CyPA axis, and stimulated CyPA-dependent ECs apoptosis in vitro. Our data indicated that REGγ had proapoptotic effects on ECs depends on CyPA pathway in vitro and functional implications in atherogenesis in vivo.
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Affiliation(s)
- Yifan Xie
- a Institutes of Biomedical Science, Fudan University , Shanghai , China.,b Department of Cardiology, Zhongshan Hospital, Fudan University , Shanghai , China.,c Shanghai Institute of Cardiovascular Diseases , Shanghai , China
| | - Xiaotao Li
- d Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University , Shanghai , China.,e Department of Molecular and Cellular Biology, The Dan L. Duncan Cancer Center, Baylor College of Medicine , Houston , TX , USA
| | - Junbo Ge
- a Institutes of Biomedical Science, Fudan University , Shanghai , China.,b Department of Cardiology, Zhongshan Hospital, Fudan University , Shanghai , China.,c Shanghai Institute of Cardiovascular Diseases , Shanghai , China
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9
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Yang W, Yang X, Wang X, Gu J, Zhou D, Wang Y, Yin B, Guo J, Zhou M. Silencing CDR1as enhances the sensitivity of breast cancer cells to drug resistance by acting as a miR-7 sponge to down-regulate REGγ. J Cell Mol Med 2019; 23:4921-4932. [PMID: 31245927 PMCID: PMC6652952 DOI: 10.1111/jcmm.14305] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 10/10/2018] [Accepted: 03/25/2019] [Indexed: 12/18/2022] Open
Abstract
In our study, we aimed to investigate the role of CDR1as during competitive inhibition of miR‐7 in the regulation of cisplatin chemosensitivity in breast cancer via regulating REGγ. RT‐qPCR was applied to detect the expression of CDR1as and miR‐7 in breast cancer tissues, breast cancer cell lines and corresponding drug‐resistant cell lines. The correlation between CDR1as and miR‐7 and between miR‐7 and REGγ was evaluated. MCF‐7‐R and MDA‐MB‐231‐R cells were selected followed by transfection of a series of mimics, inhibitors or siRNA. The effect of CDR1as on the half maximal inhibitor concentration (IC50), cisplatin sensitivity and cell apoptosis was also analysed. Furthermore, a subcutaneous xenograft nude mouse model was established to further confirm the effect of CDR1as on the chemosensitivity of breast cancer to cisplatin in vivo. Immunohistochemical staining was conducted to test the Ki‐67 expression in nude mice. A positive correlation was found between the drug resistance and CDR1as expression in breast cancer. CDR1as could increase the resistance of breast cancer cells to cisplatin. miR‐7 expression was low, while REGγ was highly expressed in MCF‐7‐R and MDA‐MB‐231‐R cells. CDR1as competitively inhibited miR‐7 and up‐regulated REGγ. Overexpression of miR‐7 could reverse the enhanced sensitivity of silenced CDR1as to drug‐resistant breast cancer cells. Additionally, in vivo experiments demonstrated that CDR1as mediated breast cancer occurrence and its sensitivity to cisplatin. Silencing CDR1as decreased Ki‐67 expression. Silencing CDR1as may inhibit the expression of REGγ by removing the competitive inhibitory effect on miR‐7 and thus enhancing the sensitivity of drug‐resistant breast cancer cells.
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Affiliation(s)
- Wei Yang
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory Wild Animal Conservation and Utilization, Guangdong Institute of Applied Biological Resources, Guangzhou, China.,Department of Medical Laboratory Science, The Fifth People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China
| | - Xiaojuan Yang
- Department of Medical Laboratory Science, The Fifth People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China.,Department of Pathology, The Second People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China
| | - Xuedong Wang
- Department of Medical Laboratory Science, The Fifth People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China.,Department of Pathology, The Second People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China
| | - Juan Gu
- Department of Medical Laboratory Science, The Fifth People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China.,Department of Pathology, The Second People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China
| | - Daoping Zhou
- Department of Medical Laboratory Science, The Fifth People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China.,Department of Oncology, The Second People's Hospital of Anhui Province, Hefei, China
| | - Yueping Wang
- Department of Medical Laboratory Science, The Fifth People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China.,Department of Oncology, The Second People's Hospital of Anhui Province, Hefei, China.,Department of Biology, College of Arts & Science, Massachusetts University, Boston, MA
| | - Bin Yin
- Department of Medical Laboratory Science, The Fifth People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China.,Department of Pathology, The Second People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China
| | - Jianmin Guo
- Department of Pathology, The Second People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China.,Guangdong Lewwin Pharmaceutical Research Institute Co. Ltd, Guangzhou, China
| | - Ming Zhou
- Department of Pathology, The Second People's Hospital of Wuxi, Nanjing Medical University, Wuxi, China.,Cancer Research Institute, Central South University, Changsha, China
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10
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Yao L, Zhou L, Xuan Y, Zhang P, Wang X, Wang T, Meng T, Xue Y, Ma X, Shah AS, Shang S, Ma X, Xie W, Wang H, Fu Q, Xia Y, Moses RE, Wang H, Li L, Xiao J, Zhang B, Li X. The proteasome activator REGγ counteracts immunoproteasome expression and autoimmunity. J Autoimmun 2019; 103:102282. [PMID: 31171475 DOI: 10.1016/j.jaut.2019.05.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 05/10/2019] [Accepted: 05/14/2019] [Indexed: 11/20/2022]
Abstract
For quite a long time, the 11S proteasome activator REGɑ and REGβ, but not REGγ, are known to control immunoproteasome and promote antigen processing. Here, we demonstrate that REGγ functions as an inhibitor for immunoproteasome and autoimmune disease. Depletion of REGγ promotes MHC class I-restricted presentation to prime CD8+ T cells in vitro and in vivo. Mice deficient for REGγ have elevation of CD8+ T cells and DCs, and develop age-related spontaneous autoimmune symptoms. Mechanistically, REGγ specifically interacts with phosphorylated STAT3 and promotes its degradation in vitro and in cells. Inhibition of STAT3 dramatically attenuates levels of LMP2/LMP7 and antigen presentation in cells lacking REGγ. Importantly, treatment with STAT3 or LMP2/7 inhibitor prevented accumulation of immune complex in REGγ-/- kidney. Moreover, REGγ-/- mice also expedites Pristane-induced lupus. Bioinformatics and immunohistological analyses of clinical samples have correlated lower expression of REGγ with enhanced expression of phosphorylated STAT3, LMP2 and LMP7 in human Lupus Nephritis. Collectively, our results support the concept that REGγ is a new regulator of immunoproteasome to balance autoimmunity.
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Liu S, Zheng LL, Zhu YM, Shen HJ, Zhong Q, Huang J, Li C, Liu Z, Yao MD, Ou RM, Zhang Q. Knockdown of REGγ inhibits the proliferation and migration and promotes the apoptosis of multiple myeloma cells by downregulating NF-κB signal pathway. ACTA ACUST UNITED AC 2017; 23:277-283. [PMID: 29020881 DOI: 10.1080/10245332.2017.1385194] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVES This study aimed to evaluate the effects of REGγ knockdown on the proliferation, apoptosis and migration of multiple myeloma (MM) cells, and reveal the potential regulatory mechanisms. METHODS The expression of REGγ on myeloma cells of 28 MM patients was detected by Western blot. shRNA-REGγ-1 and shRNA-REGγ-2 were constructed to downregulate REGγ in RPMI-8226 cells. The proliferation, apoptosis and migration of transfected cells were analyzed by Cell Counting Kit 8 (CCK8), flow cytometry and transwell chamber, respectively. The expression of phosphorylated p65 (p-p65), p65, NF-kappa-B inhibitor ε (IkBε), matrix metalloproteinase 2 (MMP2), B-cell lymphoma xL (Bcl-xL) and X-linked inhibitor of apoptosis protein (XIAP) in transfected cells was detected by Western blot. Using cycloheximide (CHX), the half-life period of IkBε was detected by Western blot. RESULTS The expression of REGγ was positive in myeloma cells. The proliferation and migration of RPMI-8226 cells were significantly inhibited by shRNA-REGγ-1/shRNA-REGγ-2, while the apoptosis rates were significantly increased (p < 0.05). The expression of p-p65 and IkBε was significantly reduced in RPMI-8226 cells transfected with shRNA-REGγ-1/shRNA-REGγ-2. The degradation of IkBε was significantly lower in RPMI-8226 cells transfected with shRNA-REGγ-1 than the control (longer half-life period). Besides, the expression of MMP2, Bcl-xL and XIAP in RPMI-8226 cells was significantly inhibited by shRNA-REGγ-1/shRNA-REGγ-2. DISCUSSION Knockdown of REGγ may inhibit the proliferation and migration, and promote the apoptosis of RPMI-8226 cells possibly by downregulating NF-κB signal pathway.
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Affiliation(s)
- Shuang Liu
- a Department of Hematology , Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
| | - Li-Ling Zheng
- a Department of Hematology , Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
| | - Yang-Min Zhu
- a Department of Hematology , Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
| | - Hui-Juan Shen
- a Department of Hematology , Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
| | - Qi Zhong
- a Department of Hematology , Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
| | - Jing Huang
- a Department of Hematology , Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
| | - Cheng Li
- b Guangdong Traditional Medical and Sports Injury Rehabilitation Research Institute, Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
| | - Zhi Liu
- a Department of Hematology , Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
| | - Meng-Dong Yao
- a Department of Hematology , Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
| | - Rui-Ming Ou
- a Department of Hematology , Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
| | - Qing Zhang
- a Department of Hematology , Guangdong Second Provincial General Hospital , Guangzhou , Guangdong Province , People's Republic of China
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12
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Chen S, Wang L, Xu C, Chen H, Peng B, Xu Y, Yao X, Li L, Zheng J. Knockdown of REGγ inhibits proliferation by inducing apoptosis and cell cycle arrest in prostate cancer. Am J Transl Res 2017; 9:3787-3795. [PMID: 28861169 PMCID: PMC5575192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 07/11/2017] [Indexed: 06/07/2023]
Abstract
Prostate cancer (PCa) is the most common malignant tumor and the second leading cause of cancer related death among men in western countries. REGγ, a proteasome activator, is reported to play important roles in various human cancers. However, the expression patterns and potential roles of REGγ in prostate cancer have never been reported. In this study, we found for the first time that REGγ is overexpressed in prostate cancer tissues and cell lines at both protein and mRNA levels. In addition, we demonstrated that knockdown of REGγ significantly inhibited cell proliferation and induced apoptosis and cell cycle arrest in PCa cell lines PC-3 and DU145. Moreover, we observed that the expressions of P21 were increased while the levels of cycinD1 and bcl-2 were decreased after knockdown of REGγ in PCa cells. And the stabilization of P21 was enhanced after REGγ knockdown in PC-3 cells. In summary, our findings suggest that REGγ may play important roles in prostate cancer and may serve as a novel therapeutic target in the treatment of PCa patients.
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Affiliation(s)
- Shaojun Chen
- Department of Urology, Shanghai Tenth People’s Hospital, Tongji UniversityShanghai, 200072, China
| | - Longsheng Wang
- Department of Urology, Shanghai Tenth People’s Hospital, Tongji UniversityShanghai, 200072, China
| | - Chen Xu
- Department of Urology, Shanghai Tenth People’s Hospital, Tongji UniversityShanghai, 200072, China
| | - Hui Chen
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal UniversityShanghai, 200241, China
| | - Bo Peng
- Department of Urology, Shanghai Tenth People’s Hospital, Tongji UniversityShanghai, 200072, China
| | - Yunfei Xu
- Department of Urology, Shanghai Tenth People’s Hospital, Tongji UniversityShanghai, 200072, China
| | - Xudong Yao
- Department of Urology, Shanghai Tenth People’s Hospital, Tongji UniversityShanghai, 200072, China
| | - Lei Li
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal UniversityShanghai, 200241, China
| | - Junhua Zheng
- Department of Urology, Shanghai Tenth People’s Hospital, Tongji UniversityShanghai, 200072, China
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Chen S, Wang L, Yao X, Chen H, Xu C, Tong L, Shah A, Huang T, Chen G, Chen J, Liu TL, Li XT, Zheng JH, Li L. miR-195-5p is critical in REGγ-mediated regulation of wnt/β-catenin pathway in renal cell carcinoma. Oncotarget 2017; 8:63986-64000. [PMID: 28969047 PMCID: PMC5609979 DOI: 10.18632/oncotarget.19256] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 06/12/2017] [Indexed: 01/22/2023] Open
Abstract
Renal cell carcinoma (RCC) is the most prevalent malignancy of kidney and accounts for approximately 4% of all cancer diagnoses in adults. Previous studies demonstrated microRNA-195-5p (miR-195-5p) as a tumor suppressor which is deregulated in many human cancers. However, the role of miR-195-5p in RCC is largely unknown. In the present study, we demonstrated that miR-195-5p was downregulated and negatively correlated with advanced clinical stage in RCC. Overexpression of miR-195-5p significantly suppressed RCC cells growth in vitro and in vivo, induced apoptosis and enhanced chemosensitivity to sorafenib. Conversely, suppression of miR-195-5p exhibited a reverse effect. REGγ, a proteasome activator, was identified as a novel downstream target of miR-195-5p in RCC. Knockdown of REGγ inhibited proliferation, induced apoptosis, increased sorafenib chemosensitivity and suppressed the wnt/β-catenin pathway in RCC cells. Moreover, restoration of REGγ markedly abolished the effects of miR-195-5p in RCC, and the wnt/β-catenin pathway was suppressed by miR-195-5p overexpression while activated by miR-195-5p inhibition in RCC cells. Our findings suggest that miR-195-5p is critical in REGγ-mediated regulation of wnt/β-catenin pathway in RCC development and may serve as a novel target for RCC treatment.
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Affiliation(s)
- Shaojun Chen
- Department of Urology, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, China
| | - Longsheng Wang
- Department of Urology, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, China
| | - Xudong Yao
- Department of Urology, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, China
| | - Hui Chen
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Chen Xu
- Department of Urology, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, China
| | - Lu Tong
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Abdussaboor Shah
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Tingmei Huang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Geng Chen
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Jiwei Chen
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Tie-Long Liu
- Department of Orthopedic Oncology, Changzheng Hospital, The Second Military Medical University, Shanghai 200003, China
| | - Xiao-Tao Li
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China.,Department of Molecular and Cellular Biology, Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Jun-Hua Zheng
- Department of Urology, Shanghai Tenth People's Hospital, Tongji University, Shanghai 200072, China
| | - Lei Li
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
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14
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Chai F, Liang Y, Bi J, Chen L, Zhang F, Cui Y, Jiang J. REGγ regulates ERα degradation via ubiquitin-proteasome pathway in breast cancer. Biochem Biophys Res Commun 2014; 456:534-40. [PMID: 25490392 DOI: 10.1016/j.bbrc.2014.11.124] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 11/26/2014] [Indexed: 02/07/2023]
Abstract
REGγ is a proteasome coactivator which regulates proteolytic activity in eukaryotic cells. Abundant lines of evidence have showed that REGγ is over expressed in a number of human carcinomas. However, its precise role in the pathogenesis of cancer is still unclear. In this study, by examining 200 human breast cancer specimens, we demonstrated that REGγ was highly expressed in breast cancers, and the expression of REGγ was positively correlated with breast cancer patient estrogen receptor alpha (ERα) status. Moreover, the expression of REGγ was found positively associated with poor clinical features and low survival rates in ERα positive breast cancer patients. Further cell culture studies using MCF7 and BT474 breast cancer cell lines showed that cell proliferation, motility, and invasion capacities were decreased significantly by REGγ knockdown. Lastly, we demonstrated that REGγ indirectly regulates the degradation of ERα protein via ubiquitin-proteasome pathway. In conclusion, our findings provide the evidence that REGγ expression was positively correlated with ERα status and poor clinical prognosis in ERα positive breast cancer patients. As well, we disclose a new connection between the two molecules that are both highly expressed in most breast cancer cases.
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Affiliation(s)
- Fan Chai
- Breast Disease Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Yan Liang
- Breast Disease Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Jiong Bi
- Laboratory of General Surgery, First Affiliated Hospital, Sun Yet-sen University, Guangzhou 510080, China
| | - Li Chen
- Breast Disease Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Fan Zhang
- Breast Disease Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Youhong Cui
- Institute of Pathology and Southwest Cancer Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Jun Jiang
- Breast Disease Center, Southwest Hospital, Third Military Medical University, Chongqing 400038, China.
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15
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Liu S, Lai L, Zuo Q, Dai F, Wu L, Wang Y, Zhou Q, Liu J, Liu J, Li L, Lin Q, Creighton CJ, Costello MG, Huang S, Jia C, Liao L, Luo H, Fu J, Liu M, Yi Z, Xiao J, Li X. PKA turnover by the REGγ-proteasome modulates FoxO1 cellular activity and VEGF-induced angiogenesis. J Mol Cell Cardiol 2014; 72:28-38. [PMID: 24560667 DOI: 10.1016/j.yjmcc.2014.02.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 02/04/2014] [Accepted: 02/11/2014] [Indexed: 01/08/2023]
Abstract
The REGγ-proteasome serves as a short-cut for the destruction of certain intact mammalian proteins in the absence of ubiquitin- and ATP. The biological roles of the proteasome activator REGγ are not completely understood. Here we demonstrate that REGγ controls degradation of protein kinase A catalytic subunit-α (PKAca) both in primary human umbilical vein endothelial cells (HUVECs) and mouse embryonic fibroblast cells (MEFs). Accumulation of PKAca in REGγ-deficient HUVECs or MEFs results in phosphorylation and nuclear exclusion of the transcription factor FoxO1, indicating that REGγ is involved in preserving FoxO1 transcriptional activity. Consequently, VEGF-induced expression of the FoxO1 responsive genes, VCAM-1 and E-Selectin, was tightly controlled by REGγ in a PKA dependent manner. Functionally, REGγ is crucial for the migration of HUVECs. REGγ(-/-) mice display compromised VEGF-instigated neovascularization in cornea and aortic ring models. Implanted matrigel plugs containing VEGF in REGγ(-/-) mice induced fewer capillaries than in REGγ(+/+) littermates. Taken together, our study identifies REGγ as a novel angiogenic factor that plays an important role in VEGF-induced expression of VCAM-1 and E-Selectin by antagonizing PKA signaling. Identification of the REGγ-PKA-FoxO1 pathway in endothelial cells (ECs) provides another potential target for therapeutic intervention in vascular diseases.
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Affiliation(s)
- Shuang Liu
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Department of Hematology, Guangdong No. 2 Provincial People's Hospital, No.1 Shiliugang Rd, Guangzhou, Guangdong 510317, China
| | - Li Lai
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Qiuhong Zuo
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Fujun Dai
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Lin Wu
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Yan Wang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Qingxia Zhou
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Jian Liu
- Department of Molecular and Cellular Biology, Dan L. Duncan Cancer Center, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Jiang Liu
- Institute of Aging Research, School of Medicine, Hangzhou Normal University, Hangzhou, Zhejiang 310036, China
| | - Lei Li
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Qingxiang Lin
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Chad J Creighton
- Department of Medicine, Dan L. Duncan Cancer Center Division of Biostatistics, Baylor College of Medicine, Houston, TX, USA
| | - Myra Grace Costello
- Department of Molecular and Cellular Biology, Dan L. Duncan Cancer Center, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Shixia Huang
- Department of Molecular and Cellular Biology, Dan L. Duncan Cancer Center, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Caifeng Jia
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Lujian Liao
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Honglin Luo
- The James Hogg Research Centre for Cardiovascular and Pulmonary Research, University of British Columbia-St. Paul's Hospital, 1081 Burrard St., Vancouver, British Columbia V6Z 1Y6, Canada
| | - Junjiang Fu
- Key Laboratory of Epigenetics and Oncology, The Research Center for Preclinical Medicine, Luzhou Medical College, Luzhou 646000, China
| | - Mingyao Liu
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Zhengfang Yi
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China; Shanghai Key Laboratory of Brain Functional Genomics (Ministry of Education), Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
| | - Jianru Xiao
- Department of Orthopaedic Oncology, Changzheng Hospital, The Second Military Medical University, 415 Fengyang Road, Shanghai 200003, China.
| | - Xiaotao Li
- Department of Molecular and Cellular Biology, Dan L. Duncan Cancer Center, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA; Department of Orthopaedic Oncology, Changzheng Hospital, The Second Military Medical University, 415 Fengyang Road, Shanghai 200003, China; Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
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Liu J, Wang Y, Li L, Zhou L, Wei H, Zhou Q, Liu J, Wang W, Ji L, Shan P, Wang Y, Yang Y, Jung SY, Zhang P, Wang C, Long W, Zhang B, Li X. Site-specific acetylation of the proteasome activator REGγ directs its heptameric structure and functions. J Biol Chem 2013; 288:16567-16578. [PMID: 23612972 PMCID: PMC3675592 DOI: 10.1074/jbc.m112.437129] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 04/22/2013] [Indexed: 12/22/2022] Open
Abstract
The proteasome activator REGγ has been reported to promote degradation of steroid receptor coactivator-3 and cyclin-dependent kinase inhibitors p21, p16, and p19 in a ubiquitin- and ATP-independent manner. A recent comparative analysis of REGγ expression in mouse and human tissues reveals a unique pattern of REGγ in specific cell types, suggesting undisclosed functions and biological importance of this molecule. Despite the emerging progress made in REGγ-related studies, how REGγ function is regulated remains to be explored. In this study, we report for the first time that REGγ can be acetylated mostly on its lysine 195 (Lys-195) residue by CREB binding protein (CBP), which can be reversed by sirtuin 1 (SIRT1) in mammalian cells. Site-directed mutagenesis abrogated acetylation at Lys-195 and significantly attenuated the capability of REGγ to degrade its target substrates, p21 and hepatitis C virus core protein. Mechanistically, acetylation at Lys-195 is important for the interactions between REGγ monomers and ultimately influences REGγ heptamerization. Biological analysis of cells containing REGγ-WT or REGγ-K195R mutant indicates an impact of acetylation on REGγ-mediated regulation of cell proliferation and cell cycle progression. These findings reveal a previously unknown mechanism in the regulation of REGγ assembly and activity, suggesting a potential venue for the intervention of the ubiquitin-independent REGγ proteasome activity.
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Affiliation(s)
- Jiang Liu
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China; Institute of Aging Research, School of Medicine, Hangzhou Normal University, Hangzhou, Zhejiang 310036, China; Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030
| | - Ying Wang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China; Institute of Aging Research, School of Medicine, Hangzhou Normal University, Hangzhou, Zhejiang 310036, China; Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030
| | - Lei Li
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Li Zhou
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Haibin Wei
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Qingxia Zhou
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Jian Liu
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030
| | - Weicang Wang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Lei Ji
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Peipei Shan
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Yan Wang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Yuanyuan Yang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Sung Yun Jung
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030
| | - Pei Zhang
- Department of Pathology, the Second Chengdu Municipal Hospital, Chengdu, Sichuan 610017, China
| | - Chuangui Wang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Weiwen Long
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030
| | - Bianhong Zhang
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China.
| | - Xiaotao Li
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences, School of Life Sciences, East China Normal University, Shanghai 200241, China; Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030.
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