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Monshizadeh K, Tajamolian M, Anbari F, Mehrjardi MYV, Kalantar SM, Dehghani M. The association of RBX1 and BAMBI gene expression with oocyte maturation in PCOS women. BMC Med Genomics 2024; 17:24. [PMID: 38238750 PMCID: PMC10797783 DOI: 10.1186/s12920-024-01800-2] [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] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 01/09/2024] [Indexed: 01/22/2024] Open
Abstract
BACKGROUND Polycystic ovarian syndrome (PCOS) is a common endocrine disorder that affects 6-20% of women of reproductive age. One of the symptoms of PCOS is hyperandrogenism, which can impair follicular development. This disruption can cause issues with the development of oocytes and the growth of embryos. Although the exact cause of PCOS is not yet fully understood, studying the gene expression pattern of cumulus cells, which play a crucial role in the maturation and quality of oocytes, could help identify the genes associated with oocyte maturation in PCOS women. Through indirect activation of APC/Cdc20, RBX1 enables oocytes to bypass the GV (germinal vesicles) stage and advance to the MII (metaphase II) stage. our other gene is the BAMBI gene which stimulates WNT signaling, that is a crucial pathway for healthy ovarian function. This study aims to explore the expression level of the RBX1 and BAMBI genes between GV and MII oocytes of PCOS and non-PCOS groups. METHODS In this experiment, we gathered the cumulus cells of MII (38 cases and 33 control) and GV (38 cases and 33 control) oocytes from women with/without PCOS. Besides, quantitative RT-PCR was used to assess the semi-quantitative expression of BAMBI and RBX1. RESULTS According to our research, the expression level of RBX1 and BAMBI in MII and GV cumulus cells of PCOS patients was significantly lower than that in non-PCOS ones. CONCLUSION This research raises the possibility of RBX1 and BAMBI involvement in oocyte quality in PCOS women.
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Affiliation(s)
- Kimia Monshizadeh
- Department of Medical Genetics, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Masoud Tajamolian
- Medical Genetics Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Fatemeh Anbari
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
- Department of Reproductive Biology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohammad Yahya Vahidi Mehrjardi
- Research Center for Food Hygiene and Safety, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Seyed Mehdi Kalantar
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohammadreza Dehghani
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
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Gao C, Ouyang W, Kutza J, Grimm TA, Fields K, Lankford CSR, Schwartzkopff F, Paciga M, Stantchev T, Tiffany L, Strebel K, Clouse KA. Macrophage-Derived Factors with the Potential to Contribute to Pathogenicity of HIV-1 and HIV-2: Role of CCL-2/MCP-1. Viruses 2023; 15:2160. [PMID: 38005838 PMCID: PMC10674259 DOI: 10.3390/v15112160] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 09/09/2023] [Accepted: 09/15/2023] [Indexed: 11/26/2023] Open
Abstract
Human immunodeficiency virus type 2 (HIV-2) is known to be less pathogenic than HIV-1. However, the mechanism(s) underlying the decreased HIV-2 pathogenicity is not fully understood. Herein, we report that β-chemokine CCL2 expression was increased in HIV-1-infected human monocyte-derived macrophages (MDM) but decreased in HIV-2-infected MDM when compared to uninfected MDM. Inhibition of CCL2 expression following HIV-2 infection occurred at both protein and mRNA levels. By microarray analysis, quantitative PCR, and Western blotting, we identified that Signal Transducer and Activator of Transcription 1 (STAT1), a critical transcription factor for inducing CCL2 gene expression, was also reduced in HIV-2-infected MDM. Blockade of STAT1 in HIV-infected MDM using a STAT1 inhibitor significantly reduced the production of CCL2. In contrast, transduction of STAT1-expressing pseudo-retrovirus restored CCL2 production in HIV-2-infected MDM. These findings support the concept that CCL2 inhibition in HIV-2-infected MDM is meditated by reduction of STAT1. Furthermore, we showed that STAT1 reduction in HIV-2-infected MDM was regulated by the CUL2/RBX1 ubiquitin E3 ligase complex-dependent proteasome pathway. Knockdown of CUL2 or RBX1 restored the expression of STAT1 and CCL2 in HIV-2-infected MDM. Taken together, our findings suggest that differential regulation of the STAT1-CCL2 axis may be one of the mechanisms underlying the different pathogenicity observed for HIV-1 and HIV-2.
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Affiliation(s)
- Chunling Gao
- Division of Biotechnology Review and Research 1, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA; (C.G.); (J.K.); (T.A.G.); (C.S.R.L.); (F.S.); (M.P.); (T.S.); (L.T.)
| | - Weiming Ouyang
- Division of Biotechnology Review and Research 2, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA
| | - Joseph Kutza
- Division of Biotechnology Review and Research 1, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA; (C.G.); (J.K.); (T.A.G.); (C.S.R.L.); (F.S.); (M.P.); (T.S.); (L.T.)
| | - Tobias A. Grimm
- Division of Biotechnology Review and Research 1, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA; (C.G.); (J.K.); (T.A.G.); (C.S.R.L.); (F.S.); (M.P.); (T.S.); (L.T.)
| | - Karen Fields
- Division of Biotechnology Review and Research 1, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA; (C.G.); (J.K.); (T.A.G.); (C.S.R.L.); (F.S.); (M.P.); (T.S.); (L.T.)
| | - Carla S. R. Lankford
- Division of Biotechnology Review and Research 1, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA; (C.G.); (J.K.); (T.A.G.); (C.S.R.L.); (F.S.); (M.P.); (T.S.); (L.T.)
| | - Franziska Schwartzkopff
- Division of Biotechnology Review and Research 1, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA; (C.G.); (J.K.); (T.A.G.); (C.S.R.L.); (F.S.); (M.P.); (T.S.); (L.T.)
| | - Mark Paciga
- Division of Biotechnology Review and Research 1, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA; (C.G.); (J.K.); (T.A.G.); (C.S.R.L.); (F.S.); (M.P.); (T.S.); (L.T.)
| | - Tzanko Stantchev
- Division of Biotechnology Review and Research 1, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA; (C.G.); (J.K.); (T.A.G.); (C.S.R.L.); (F.S.); (M.P.); (T.S.); (L.T.)
| | - Linda Tiffany
- Division of Biotechnology Review and Research 1, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA; (C.G.); (J.K.); (T.A.G.); (C.S.R.L.); (F.S.); (M.P.); (T.S.); (L.T.)
| | - Klaus Strebel
- Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA;
| | - Kathleen A. Clouse
- Division of Biotechnology Review and Research 1, Office of Biotechnology Products, Center for Drug Evaluation and Research, U. S. Food and Drug Administration, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA; (C.G.); (J.K.); (T.A.G.); (C.S.R.L.); (F.S.); (M.P.); (T.S.); (L.T.)
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Xu D, Yu J, Yang Y, Du Y, Lu H, Zhang S, Feng Q, Yu Y, Hao L, Shao J, Chen L. RBX1 regulates PKM alternative splicing to facilitate anaplastic thyroid carcinoma metastasis and aerobic glycolysis by destroying the SMAR1/HDAC6 complex. Cell Biosci 2023; 13:36. [PMID: 36810109 PMCID: PMC9945352 DOI: 10.1186/s13578-023-00987-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 02/14/2023] [Indexed: 02/23/2023] Open
Abstract
BACKGROUND Anaplastic thyroid carcinoma (ATC) is one of the most aggressive malignancies, frequently accompanied by metastasis and aerobic glycolysis. Cancer cells adjust their metabolism by modulating the PKM alternative splicing and facilitating PKM2 isoform expression. Therefore, identifying factors and mechanisms that control PKM alternative splicing is significant for overcoming the current challenges in ATC treatment. RESULTS In this study, the expression of RBX1 was largely enhanced in the ATC tissues. Our clinical tests suggested that high RBX1 expression was significantly related to poor survival. The functional analysis indicated that RBX1 facilitated the metastasis of ATC cells by enhancing the Warburg effect, and PKM2 played a key role in RBX1-mediated aerobic glycolysis. Furthermore, we confirmed that RBX1 regulates PKM alternative splicing and promotes the PKM2-mediated Warburg effect in ATC cells. Moreover, ATC cell migration and aerobic glycolysis induced by RBX1-mediated PKM alternative splicing are dependent on the destruction of the SMAR1/HDAC6 complex. RBX1, as an E3 ubiquitin ligase, degrades SMAR1 in ATC through the ubiquitin-proteasome pathway. CONCLUSION Overall, our study identified the mechanism underlying the regulation of PKM alternative splicing in ATC cells for the first time and provides evidence about the effect of RBX1 on cellular adaptation to metabolic stress.
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Affiliation(s)
- Debin Xu
- grid.412455.30000 0004 1756 5980Department of Thyroid Surgery, Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Nanchang, 330008 China
| | - Jichun Yu
- grid.412455.30000 0004 1756 5980Department of Thyroid Surgery, Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Nanchang, 330008 China
| | - Yuting Yang
- grid.412604.50000 0004 1758 4073Department of Intensive Care Unit, First Affiliated Hospital of Nanchang University, No. 17, Yongwai Main Street, Nanchang, 330006 China
| | - Yunyan Du
- grid.260463.50000 0001 2182 8825School of Pharmacy, Nanchang University, No. 471, Bayi Road, Nanchang, 330006 China
| | - Hongcheng Lu
- grid.412455.30000 0004 1756 5980Department of General Surgery, Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Nanchang, 330008 China
| | - Shouhua Zhang
- grid.260463.50000 0001 2182 8825Department of General Surgery, Affiliated Children’s Hospital of Nanchang University, No. 122, Yangming Road, Nanchang, 330006 China
| | - Qian Feng
- grid.412455.30000 0004 1756 5980Department of General Surgery, Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Nanchang, 330008 China
| | - Yi Yu
- Department of Urology, Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Nanchang, 330008, China.
| | - Liang Hao
- Department of Orthopaedics, Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Nanchang, 330008, China.
| | - Jun Shao
- Department of Cardiovascular Surgery, Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Nanchang, 330008, China.
| | - Leifeng Chen
- Department of General Surgery, Second Affiliated Hospital of Nanchang University, No. 1 Minde Road, Nanchang, 330008, China. .,Cancer Center, Renmin Hospital of Wuhan University, No. 238 Jiefang Road, Wuhan, 430060, China.
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4
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Shao J, Feng Q, Jiang W, Yang Y, Liu Z, Li L, Yang W, Zou Y. E3 ubiquitin ligase RBX1 drives the metastasis of triple negative breast cancer through a FBXO45-TWIST1-dependent degradation mechanism. Aging (Albany NY) 2022; 14:5493-5510. [PMID: 35802537 PMCID: PMC9320552 DOI: 10.18632/aging.204163] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 06/23/2022] [Indexed: 11/25/2022]
Abstract
Triple-negative breast cancer (TNBC) patients are at high risk of recurrence and metastasis in the early stages, although receiving standard treatment. However, the underlying mechanism of TNBC remains unclear. Here, the critical effect of E3 ubiquitin ligase RBX1 in the metastasis of TNBC was reported for the first time. We discovered that RBX1 expression was evidently raised in the tissues of TNBC. Our clinical research displayed that high RBX1 expression was markedly related to poor distant invasion and survival. Functional analysis exhibited that RBX1 facilitated metastasis of TNBC cells through increasing EMT. Furthermore, we demonstrated that RBX1 knockdown increased the levels of the Twist family bHLH transcription factor 1 (TWIST1), is a significant regulator in the EMT process in some cancers. It can be observed an evident positive correlation between the TWIST1 and RBX1 levels, further confirming that EMT induced by RBX1 in TNBC cells is determined by TWIST1. Mechanistically, RBX1 modulates the expression of TWIST1 via modulating FBXO45, directly binding to FBXO45, and facilitating its degradation and ubiquitination. Briefly, our findings confirm that RBX1 is probably a new biomarker of TNBC carcinogenesis, thus suggesting that targeting the RBX1/FBXO45/TWIST1 axis may be an underlying strategy for TNBC treatment.
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Affiliation(s)
- Jun Shao
- Department of General Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, Jiangxi Province, China
| | - Qian Feng
- Department of General Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, Jiangxi Province, China
| | - Weifan Jiang
- Department of Urology Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, Jiangxi Province, China
| | - Yuting Yang
- Department of Medical College, Nanchang University, Nanchang 330006, Jiangxi Province, China
| | - Zhiqiang Liu
- Department of Neurology, Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, Nanchang 330006, Jiangxi Province, China
| | - Liang Li
- Emergency Department, Jiangxi Maternal and Child Health Hospital, Nanchang 330006, Jiangxi Province, China
| | - Wenlong Yang
- Department of Infectious Diseases, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, Jiangxi Province, China
| | - Yufeng Zou
- Department of Breast Surgery, The Third Hospital of Nanchang, Jiangxi Provincial-Key-Laboratory for Breast Diseases, Nanchang 330006, Jiangxi Province, China.,Department of Medical College, Nanchang University, Nanchang 330006, Jiangxi Province, China
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5
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Zhou M, Cheng H, Fu Y, Zhang J. Long noncoding RNA DARS-AS1 regulates TP53 ubiquitination and affects ovarian cancer progression by modulation miR-194-5p/ RBX1 axis. J Biochem Mol Toxicol 2021; 35:e22865. [PMID: 34328246 DOI: 10.1002/jbt.22865] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 07/13/2021] [Accepted: 07/19/2021] [Indexed: 01/07/2023]
Abstract
BACKGROUND Ovarian cancer is a malignant tumor with a poor prognosis, its underlying mechanism is still unclear. OBJECTIVE In this study, long noncoding RNA DARS-AS1 was studied to identify its function in the development of ovarian cancer. METHODS Perform functional experiments to detect the effects of DARS-AS1 on the proliferation, apoptosis, and migration of ovarian cancer cells A2780. The luciferase report, immunoprecipitation (IP) experiment, and ubiquitination level determination verify that RBX1 ubiquitination and mediate the degradation of tumor suppressor gene TP53. RESULTS Knockdown of DARS-AS1 can inhibit cell proliferation, migration, and apoptosis, and the application of miR-194-5p inhibitors can prevent this process. Luciferase and IP experiments showed that DARS-AS1 regulates the expression of RBX1 by binding to miR-194-5p, and RBX1 mediates its degradation through ubiquitination of TP53.
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Affiliation(s)
- Ming Zhou
- Department of Gynecological Oncology, Shaanxi Cancer Hospital Affiliated to Xi'an Jiaotong University, Xi'an, China
| | - Hao Cheng
- Department of Ultrasonography, Shaanxi Cancer Hospital Affiliated to Xi'an Jiaotong University, Xi'an, China
| | - Yulan Fu
- Department of Gynecological Oncology, Shaanxi Cancer Hospital Affiliated to Xi'an Jiaotong University, Xi'an, China
| | - Jun Zhang
- Department of Gynecological Oncology, Shaanxi Cancer Hospital Affiliated to Xi'an Jiaotong University, Xi'an, China
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6
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Bungsy M, Palmer MCL, Jeusset LM, Neudorf NM, Lichtensztejn Z, Nachtigal MW, McManus KJ. Reduced RBX1 expression induces chromosome instability and promotes cellular transformation in high-grade serous ovarian cancer precursor cells. Cancer Lett 2020; 500:194-207. [PMID: 33290867 DOI: 10.1016/j.canlet.2020.11.051] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [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: 09/09/2020] [Revised: 11/26/2020] [Accepted: 11/30/2020] [Indexed: 12/14/2022]
Abstract
Despite high-grade serous ovarian cancer (HGSOC) being the most common and lethal gynecological cancer in women, the early etiological events driving disease development remain largely unknown. Emerging evidence now suggests that chromosome instability (CIN; ongoing changes in chromosome numbers) may play a central role in the development and progression of HGSOC. Importantly, genomic amplification of the Cyclin E1 gene (CCNE1) contributes to HGSOC pathogenesis in ~20% of patients, while Cyclin E1 overexpression induces CIN in model systems. Cyclin E1 levels are normally regulated by the SCF (SKP1-CUL1-FBOX) complex, an E3 ubiquitin ligase that includes RBX1 as a core component. Interestingly, RBX1 is heterozygously lost in ~80% of HGSOC cases and reduced expression corresponds with worse outcomes, suggesting it may be a pathogenic event. Using both short (siRNA) and long (CRISPR/Cas9) term approaches, we show that reduced RBX1 expression corresponds with significant increases in CIN phenotypes in fallopian tube secretory epithelial cells, a cellular precursor of HGSOC. Moreover, reduced RBX1 expression corresponds with increased Cyclin E1 levels and anchorage-independent growth. Collectively, these data identify RBX1 as a novel CIN gene with pathogenic implications for HGSOC.
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Affiliation(s)
- Manisha Bungsy
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Michaela C L Palmer
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Lucile M Jeusset
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Nicole M Neudorf
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Zelda Lichtensztejn
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada
| | - Mark W Nachtigal
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Obstetrics, Gynecology & Reproductive Sciences, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Kirk J McManus
- Research Institute in Oncology & Hematology, Winnipeg, Manitoba, R3E 0V9, Canada; Department of Biochemistry and Medical Genetics, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, R3E 0V9, Canada.
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7
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Peng Q, Xu H, Xiao M, Wang L. The small molecule PSSM0332 disassociates the CRL4A DCAF8 E3 ligase complex to decrease the ubiquitination of NcoR1 and inhibit the inflammatory response in a mouse sepsis-induced myocardial dysfunction model. Int J Biol Sci 2020; 16:2974-2988. [PMID: 33061810 PMCID: PMC7545708 DOI: 10.7150/ijbs.50186] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 07/01/2020] [Accepted: 09/02/2020] [Indexed: 12/18/2022] Open
Abstract
Sepsis-induced myocardial dysfunction (SIMD) is a life-threatening complication caused by inflammation, but how it is initiated is still unclear. Several studies have shown that extracellular high mobility group box 1 (HMGB1), an important cytokine triggering inflammation, is overexpressed during the pathogenesis of SIMD, but the underlying mechanism regarding its overexpression is still unknown. Herein, we discovered that CUL4A (cullin 4A) assembled an E3 ligase complex with RBX1 (ring-box 1), DDB1 (DNA damage-binding protein 1), and DCAF8 (DDB1 and CUL4 associated factor 8), termed CRL4ADCAF8, which ubiquitinated and degraded NcoR1 (nuclear receptor corepressor 1) in an LPS-induced SIMD mouse model. The degradation of NcoR1 failed to form a complex with the SP1 transcription factor, leading to the upregulation of HMGB1. Mature HMGB1 functioned as an effector to induce the expression of proinflammatory cytokines, causing inflammation and resulting in SIMD pathology. Using an in vitro AlphaScreen technology, we identified three small molecules that could inhibit the CUL4A-RBX1 interaction. Of them, PSSM0332 showed the strongest ability to inhibit the ubiquitination of NcoR1, and its administration in SIMD mice exhibited promising effects on decreasing the inflammatory response. Collectively, our results reveal that the CRL4ADCAF8 E3 ligase is critical for the initiation of SIMD by regulating the expression of HMGB1 and proinflammatory cytokines. Our results suggest that PSSM0332 is a promising candidate to inhibit the inflammatory response in the pathogenesis of SIMD, which will provide a new option for the therapy of SIMD.
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Affiliation(s)
- Qingyun Peng
- Department of Critical Care Medicine, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu, China
| | - Huifen Xu
- Department of Critical Care Medicine, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu, China
| | - Mingbing Xiao
- Department of Gastroenterology and Research Center of Clinical Medicine, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu, China
| | - Linhua Wang
- Department of Critical Care Medicine, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu, China
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8
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Wang L, Tang D, Wu T, Sun F. ELF1-mediated LUCAT1 promotes choroidal melanoma by modulating RBX1 expression. Cancer Med 2020; 9:2160-2170. [PMID: 31968402 PMCID: PMC7064025 DOI: 10.1002/cam4.2859] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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: 11/01/2019] [Revised: 12/10/2019] [Accepted: 01/06/2020] [Indexed: 12/14/2022] Open
Abstract
Long noncoding RNAs (lncRNAs) are essential regulators of gene expression and biological behaviors. However, the contribution of lncRNA LUCAT1 to choroidal melanoma (CM) remains unexplored. Here, we examined the expression of LUCAT1 in CM cells by qRT‐PCR and investigated its biological effects by cell counting kit‐8, EdU, TUNEL, transwell assays, and Western blot. Bioinformatics tools were applied to find RNA candidates for further study. Moreover, mechanistic experiments including RNA immunoprecipitation assay, pull‐down assay, and luciferase reporter assay confirmed the relation or interaction among the indicated molecules. Here, we reported ELF1 as the transcription activator of LUCAT1. Functionally, elevated expression of LUCAT1 positively regulated CM cell proliferation, metastasis, and epithelial‐mesenchymal transition process. In addition, we verified the competing endogenous RNA (ceRNA) hypothesis of LUCAT1 and confirmed LUCAT1 modulates CM progression by modulating miR‐514a/b‐3p/RBX1 axis. Meanwhile, miR‐514a/b‐3p was suggested to repress CM progression, whereas RBX1 was unmasked to aggravate CM development. Of note, RBX1 overexpression rescued the inhibitory effect of LUCAT1 silence on the biological processes of CM cells. Altogether, this study unveiled the modulation axis ELF1/LUCAT1/miR‐514a/b‐3p/RBX1 and evidenced LUCAT1 as a promoter in CM for the first time, providing a novel insight into future treatment of CM.
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Affiliation(s)
- Lina Wang
- Tianjin Medical University Eye Hospital, Tianjin, China.,Tianjin First Central Hospital, Tianjin, China
| | - Dongrun Tang
- Tianjin Medical University Eye Hospital, Tianjin, China
| | - Tong Wu
- Tianjin Medical University Eye Hospital, Tianjin, China
| | - Fengyuan Sun
- Tianjin Medical University Eye Hospital, Tianjin, China
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9
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Kumar A, Shaha C. RBX1-mediated ubiquitination of SESN2 promotes cell death upon prolonged mitochondrial damage in SH-SY5Y neuroblastoma cells. Mol Cell Biochem 2018; 446:1-9. [PMID: 29294217 DOI: 10.1007/s11010-017-3267-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [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: 10/05/2017] [Accepted: 12/23/2017] [Indexed: 12/14/2022]
Abstract
Sestrins are evolutionary conserved stress-inducible genes which regulate the axis of cell survival and cell death. Suppression of Sestrin 2 (SESN2) has been linked with increase in oxidative stress and cell death but mechanistic details related to regulation of SESN2 during mitochondrial damage remain unknown. Our study shows that prolonged CCCP-induced mitochondrial damage decreases SESN2 levels and viability of SH-SY5Y cells while overexpression of SESN2 significantly rescues the viability of cells. Further, we demonstrate that Ring box protein 1 (RBX1) is a novel interactive partner and E3 ligase for SESN2 which mediates its K-48-linked ubiquitination upon extensive mitochondrial damage. Downregulation of RBX1 causes stabilization in levels of SESN2. Notably, silencing of RBX1 expression substantially declines cell death and generation of mitochondrial ROS in response to prolonged mitochondrial damage. Taken together, we suggest that SESN2 is critical to protect cells against detrimental effect of mitochondrial damage and RBX1 is a negative regulator of SESN2 which hampers its stabilization.
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Affiliation(s)
- Ashish Kumar
- Cell Death and Differentiation Research Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Chandrima Shaha
- Cell Death and Differentiation Research Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India.
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Xing R, Chen KB, Xuan Y, Feng C, Xue M, Zeng YC. RBX1 expression is an unfavorable prognostic factor in patients with non-small cell lung cancer. Surg Oncol 2016; 25:147-51. [PMID: 27566015 DOI: 10.1016/j.suronc.2016.05.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [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: 02/25/2016] [Accepted: 05/08/2016] [Indexed: 11/27/2022]
Abstract
The purpose of this study was to assess the prognostic value of RBX1 in patients with non-small cell lung cancer (NSCLC). Quantitative real-time (RT-PCR) and western blot were used to evaluate the mRNA and protein expression of RBX1 in NSCLC and corresponding non-cancerous tissues. Immunohistochemistry was performed to examine the expression of RBX1 in 192 NSCLC tissue samples. Overall survival was evaluated by the Kaplan-Meier method and analyzed by the log-rank test between different groups. The results showed that the RBX1 expression was significantly higher in NSCLC tissues than the corresponding non-cancerous lung tissues. High RBX1 expression was related to poor tumor differentiation, advanced TNM stage, and lymph node metastasis. Patients with high RBX1 expression had poor overall survival than those with high expression levels, which was consistent with the results of the subgroup analysis. Multivariate analysis showed that high RBX1 expression was an unfavorable prognostic factor for NSCLC patients. Our study indicated that RBX1 might play an important role in the observation of prognosis in NSCLC and could be a valuable marker for predicting the treatment outcome in patients with NSCLC.
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Affiliation(s)
- Rui Xing
- Department of Medical Oncology, Shengjing Hospital of China Medical University, 39 Huaxiang Road, Shenyang 110022, China
| | - Kuan-Bing Chen
- Department of Thoracic Surgery, Shengjing Hospital of China Medical University, 39 Huaxiang Road, Shenyang 110022, China
| | - Ying Xuan
- Department of Medical Oncology, Shengjing Hospital of China Medical University, 39 Huaxiang Road, Shenyang 110022, China
| | - Chi Feng
- Department of Medical Oncology, Shengjing Hospital of China Medical University, 39 Huaxiang Road, Shenyang 110022, China
| | - Ming Xue
- Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, 39 Huaxiang Road, Shenyang 110022, China
| | - Yue-Can Zeng
- Department of Medical Oncology, Shengjing Hospital of China Medical University, 39 Huaxiang Road, Shenyang 110022, China.
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