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Cao X, Yan Z, Chen Z, Ge Y, Hu X, Peng F, Huang W, Zhang P, Sun R, Chen J, Ding M, Zong D, He X. The Emerging Role of Deubiquitinases in Radiosensitivity. Int J Radiat Oncol Biol Phys 2024; 118:1347-1370. [PMID: 38092257 DOI: 10.1016/j.ijrobp.2023.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 11/03/2023] [Accepted: 12/03/2023] [Indexed: 02/05/2024]
Abstract
Radiation therapy is a primary treatment for cancer, but radioresistance remains a significant challenge in improving efficacy and reducing toxicity. Accumulating evidence suggests that deubiquitinases (DUBs) play a crucial role in regulating cell sensitivity to ionizing radiation. Traditional small-molecule DUB inhibitors have demonstrated radiosensitization effects, and novel deubiquitinase-targeting chimeras (DUBTACs) provide a promising strategy for radiosensitizer development by harnessing the ubiquitin-proteasome system. This review highlights the mechanisms by which DUBs regulate radiosensitivity, including DNA damage repair, the cell cycle, cell death, and hypoxia. Progress on DUB inhibitors and DUBTACs is summarized, and their potential radiosensitization effects are discussed. Developing drugs targeting DUBs appears to be a promising alternative approach to overcoming radioresistance, warranting further research into their mechanisms.
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Affiliation(s)
- Xiang Cao
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China
| | - Zhenyu Yan
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China
| | - Zihan Chen
- Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Yizhi Ge
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China
| | - Xinyu Hu
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China
| | - Fanyu Peng
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China
| | - Wenxuan Huang
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China
| | - Pingchuan Zhang
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China
| | - Ruozhou Sun
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China
| | - Jiazhen Chen
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China
| | - Mingjun Ding
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China
| | - Dan Zong
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China.
| | - Xia He
- Affiliated Cancer Hospital of Nanjing Medical University, Jiangsu Cancer Hospital, and Jiangsu Institute of Cancer Research, Nanjing, Jiangsu, China; Xuzhou Medical University, Xuzhou, Jiangsu, China; Department of Environmental Genomics, Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China.
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Li Y, Zhang X, Liu N, Liu R, Zhang W, Chen L, Chen Y. RNF166 promotes colorectal cancer progression by recognizing and destabilizing poly-ADP-ribosylated angiomotins. Cell Death Dis 2024; 15:211. [PMID: 38480683 PMCID: PMC10937711 DOI: 10.1038/s41419-024-06595-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 03/04/2024] [Accepted: 03/06/2024] [Indexed: 03/17/2024]
Abstract
Activation of the Hippo pathway by angiomotins to limit colorectal cancer progression is prevalent, whereas the regulation of angiomotins remains elusive. In this study, we uncover the involvement of an upregulated E3 ubiquitin ligase called RNF166, which destabilizes angiomotins, activates YAP, and is associated with a poor prognosis in colorectal cancer patients. Mechanistically, RNF166 specifically recognizes PARsylated angiomotin, a modification mediated by tankyrase at specific amino acid residues (D506, E513, E516, and E528). The tankyrase inhibitor XAV939, effectively prevents RNF166-dependent destabilization of angiomotins and subsequent activation of YAP. Additionally, YAP-5SA, a constitutively active form of YAP, rescues colorectal cancer progression following knockdown of RNF166. Importantly, the C-terminus of RNF66, particularly the Di19-ZF domain, is the crucial region responsible for recognizing ADP-ribosylated angiomotins. Together, this work not only sheds light on the regulation of the Hippo pathway in colorectal cancer but also uncovers a novel poly(ADP-ribose)-binding domain, which may serve as a potential therapeutic target for intervention.
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Affiliation(s)
- Yun Li
- Department of Oncology, NHC Key Laboratory of Cancer Proteomics & State Local Joint Engineering Laboratory for Anticancer Drugs, National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Xiangqian Zhang
- Department of Oncology, NHC Key Laboratory of Cancer Proteomics & State Local Joint Engineering Laboratory for Anticancer Drugs, National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Na Liu
- Department of Endocrinology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Ruijie Liu
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Wuming Zhang
- Department of General Surgery, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Lin Chen
- Department of Oncology, NHC Key Laboratory of Cancer Proteomics & State Local Joint Engineering Laboratory for Anticancer Drugs, National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China.
| | - Yongheng Chen
- Department of Oncology, NHC Key Laboratory of Cancer Proteomics & State Local Joint Engineering Laboratory for Anticancer Drugs, National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China.
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George M, Masamba P, Iwalokun BA, Kappo AP. Zooming into the structure-function of RING finger proteins for anti-cancer therapeutic applications. Am J Cancer Res 2023; 13:2773-2789. [PMID: 37559981 PMCID: PMC10408477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Accepted: 05/22/2023] [Indexed: 08/11/2023] Open
Abstract
Cancer is one of the most common and widely diagnosed diseases worldwide. With an increase in prevalence and incidence, many studies in cancer biology have been looking at the role pro-cancer proteins play. One of these proteins is the Really Interesting New Gene (RING), which has been studied extensively due to its structure and functions such as apoptosis, neddylation, and its role in ubiquitination. The RING domain is a cysteine-rich domain known to bind Cysteine and Histidine residues. It also binds two zinc ions that help stabilize the protein in various patterns, often with a 'cross-brace' topology. Different RING finger proteins have been studied and found to have suitable targets for developing anti-cancer therapeutics. These identified candidate proteins include Parkin, COP1, MDM2, BARD1, BRCA-1, PIRH2, c-CBL, SIAH1, RBX1 and RNF8. Inhibiting these candidate proteins provides opportunities for shutting down pathways associated with tumour development and metastasis.
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Affiliation(s)
- Mary George
- Molecular Biophysics and Structural Biology (MBSB) Group, Department of Biochemistry, Faculty of Science, University of Johannesburg, Auckland Park Kingsway CampusAuckland Park, Johannesburg, South Africa
| | - Priscilla Masamba
- Molecular Biophysics and Structural Biology (MBSB) Group, Department of Biochemistry, Faculty of Science, University of Johannesburg, Auckland Park Kingsway CampusAuckland Park, Johannesburg, South Africa
| | - Bamidele Abiodun Iwalokun
- Department of Molecular Biology and Biotechnology, Nigerian Institute of Medical Research (NIMR)Yaba, Lagos, Nigeria
| | - Abidemi Paul Kappo
- Molecular Biophysics and Structural Biology (MBSB) Group, Department of Biochemistry, Faculty of Science, University of Johannesburg, Auckland Park Kingsway CampusAuckland Park, Johannesburg, South Africa
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Arazi H, Birak Olia RB, Eghbali E. Are the digit ratio (2D:4D) and hand grip strength related to Parkinson disease in elderly males? BMC Sports Sci Med Rehabil 2023; 15:34. [PMID: 36941653 PMCID: PMC10026433 DOI: 10.1186/s13102-023-00642-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 03/09/2023] [Indexed: 03/23/2023]
Abstract
BACKGROUND Sex hormones affect the pathogenesis of Parkinson patients and it has been suggested that gender is the most important factor in the development and progression of Parkinson's disease. Studies have shown that the second to fourth digit ratio (2D:4D) is affected by the prenatal testosterone and estrogen levels and can predict predisposition to disease. In addition, decreased muscle strength in people with Parkinson's has been repeatedly reported. Hand grip strength (HGS) is a suitable measure to evaluate the musculoskeletal system among the elderly and it is considered as an indicator of the overall strength of the body. This study aimed at investigating the relationship between Parkinson's disease and HGS and 2D:4D ratio. METHODS In this study 117 elderly men with Parkinson disease (mean age of 61.66 ± 11.28 years) and 156 healthy control subjects (mean age of 61.86 ± 6.29 years) participated. After determining the level of disability of Parkinson patients by a neurologist (level of disability in the range of 1-4), anthropometric indices (height, weight, length of the second and fourth fingers) and maximum HGS were measured. RESULTS Although 2D:4D ratios (right and left hand) of male patients with Parkinson's disease were higher than those of healthy males, this difference was not statistically significant (P = 0.12, P = 0.40; respectively). Conversely, HGS for the right and left hands of Parkinson patients were significantly lower than those of healthy males (P = 0.02, P = 0.03; respectively). The results showed a significant negative relationship between Parkinson disease and the right and left HGS (R = -0.16, P = 0.005; R = -0.17, P = 0.003; respectively). Parkinson disease had no significant relationship with 2D:4D of the right hand, left hand, mean finger ratio and DR-L 2D:4D (P > 0.05). The regression results showed that the right and left HGS were not able to predict Parkinson disease (P = 0.25, P = 0.16; respectively). CONCLUSION We concluded that HGS was negatively associated with the Parkinson disease, but conversely, 2D:4D may not be a valuable biomarker of elevated risk of Parkinson in elderly males.
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Affiliation(s)
- Hamid Arazi
- Department of Exercise Physiology, Faculty of Sport Sciences, University of Guilan, P.O. Box: 41635-1438, Rasht, Iran.
| | - Roghayeh Bavafa Birak Olia
- Department of Exercise Physiology, Faculty of Sport Sciences, University of Guilan, P.O. Box: 41635-1438, Rasht, Iran
| | - Ehsan Eghbali
- Department of Exercise Physiology, Faculty of Sport Sciences, University of Guilan, P.O. Box: 41635-1438, Rasht, Iran
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Wu W, Zhang X, He F, Wu L. High expression of ring finger protein 115 contributes to the progression of colorectal cancer via WNT/β-catenin pathway. Mol Cell Toxicol 2022. [DOI: 10.1007/s13273-021-00211-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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RNF166 plays a dual role for Lys63-linked ubiquitination and sumoylation of its target proteins. J Neural Transm (Vienna) 2021; 129:463-475. [PMID: 34837535 DOI: 10.1007/s00702-021-02442-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 11/08/2021] [Indexed: 10/19/2022]
Abstract
Ubiquitination and sumoylation are two important posttranslational modifications in cells. RING (Really Interesting New Gene)-type E3 ligases play essential roles in regulating a plethora of biological processes such as cell survival and death. In our previous study, we performed a microarray using inputs from MN9D dopaminergic neuronal cells treated with 6-hydroxydopamine and identified a novel RING-type E3 ligase, RNF166. We showed that RNF166 exerts proapoptotic effects via ubiquitin-dependent degradation of X-linked inhibitor of apoptosis and subsequent overactivation of caspase-dependent neuronal death following 6-hydroxydopamine treatment. In the present study, we further expanded the list of RNF166's binding substrates using mass spectral analyses of immunoprecipitates obtained from RNF166-overexpressing HEK293 cells. Poly (ADP-ribose) polymerase 1, ATPase WRNIP1, X-ray repair cross-complementing protein 5 (Ku80), and replication protein A 70 were identified as potential binding partners of RNF166. Additionally, we confirmed that RNF166 interacts with and forms lysine 63-linked polyubiquitin chains in Ku80. Consequently, these events promoted the increased stability of Ku80. Intriguingly, we found that RNF166 also contains distinct consensus sequences termed SUMO-interacting motifs and interacts with apoptosis signal-regulating kinase 1 (ASK1). We determined that RNF166 induces the sumoylation of ASK1. Overall, our data provide novel evidence that RNF166 has a dual function of Lys63-linked ubiquitination and sumoylation of its cellular targets.
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Xiao J, Lv C, Xiao C, Ma J, Liao J, Liu T, Du J, Zuo S, Li H, Gu H. Construction of a ceRNA Network and Analysis of Tumor Immune Infiltration in Pancreatic Adenocarcinoma. Front Mol Biosci 2021; 8:745409. [PMID: 34760926 PMCID: PMC8573228 DOI: 10.3389/fmolb.2021.745409] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 09/15/2021] [Indexed: 12/14/2022] Open
Abstract
Pancreatic adenocarcinoma (PAAD) is characterized by high malignancy, frequent metastasis, and recurrence with an unfavorable prognosis. This study is aimed at constructing a prognostic model for tumor-infiltrating immune cells and a competing endogenous RNA (ceRNA) network in PAAD and analyzing susceptibilities of chemotherapy and immunotherapy of PAAD. Gene expression profiles and clinical information of PAAD were downloaded from The Cancer Genome Atlas (TCGA) database and divided into the tumor group and the normal group. A total of five PAAD survival-related key genes in the ceRNA network and three survival-related immune infiltrating cells were uncovered, and two survival risk models and nomograms were constructed. The efficiency and performance of the two models were verified using multi-index area under the curve analysis at different time points, decision curve analysis, and calibration curves. Co-expression analysis showed that LRRC1, MIR600HG, and RNF166 in the ceRNA network and tumor-infiltrating immune cells including CD8 T cells and M1 macrophages were likely related to the PAAD prognosis, and the expression of key ceRNA-related genes was experimently validated in tissues and cell lines by RT-qPCR. Patients with low risk scores for key genes in the ceRNA network displayed a positive response to anti-programmed death-1 (PD-1) treatment and greater sensitivity to chemotherapeutic drugs such as docetaxel, lapatinib, and paclitaxel. More importantly, our results suggested that the IC50 values of gemcitabine in PAAD were not significantly different between the high and low risk groups. The expression levels of immune checkpoints were significantly different in the high-risk and low-risk groups. The prognostic model, nomogram, and drug analysis may provide an essential reference for PAAD patient management in the clinic.
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Affiliation(s)
- Jingjing Xiao
- School of Clinical Medicine, Guizhou Medical University, Guiyang, China.,Department of Hepatobiliary Surgery, Guizhou Provincial People's Hospital, Guiyang, China.,Department of Pediatric Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Chao Lv
- School of Clinical Medicine, Guizhou Medical University, Guiyang, China.,Department of Pediatric Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Chuan Xiao
- School of Clinical Medicine, Guizhou Medical University, Guiyang, China.,Department of Pediatric Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Jinyu Ma
- School of Clinical Medicine, Guizhou Medical University, Guiyang, China
| | - Jun Liao
- School of Clinical Medicine, Guizhou Medical University, Guiyang, China.,Department of Pediatric Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Tao Liu
- School of Clinical Medicine, Guizhou Medical University, Guiyang, China
| | - Jun Du
- Department of Pediatric Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Shi Zuo
- Department of Hepatobiliary Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Haiyang Li
- Department of Hepatobiliary Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Huajian Gu
- School of Clinical Medicine, Guizhou Medical University, Guiyang, China.,Department of Pediatric Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
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Hsu YL, Hung HS, Tsai CW, Liu SP, Chiang YT, Kuo YH, Shyu WC, Lin SZ, Fu RH. Peiminine Reduces ARTS-Mediated Degradation of XIAP by Modulating the PINK1/Parkin Pathway to Ameliorate 6-Hydroxydopamine Toxicity and α-Synuclein Accumulation in Parkinson's Disease Models In Vivo and In Vitro. Int J Mol Sci 2021; 22:ijms221910240. [PMID: 34638579 PMCID: PMC8549710 DOI: 10.3390/ijms221910240] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/20/2021] [Accepted: 09/21/2021] [Indexed: 02/06/2023] Open
Abstract
Parkinson’s disease (PD) is a degenerative disease that can cause motor, cognitive, and behavioral disorders. The treatment strategies being developed are based on the typical pathologic features of PD, including the death of dopaminergic (DA) neurons in the substantia nigra of the midbrain and the accumulation of α-synuclein in neurons. Peiminine (PMN) is an extract of Fritillaria thunbergii Miq that has antioxidant and anti-neuroinflammatory effects. We used Caenorhabditis elegans and SH-SY5Y cell models of PD to evaluate the neuroprotective potential of PMN and address its corresponding mechanism of action. We found that pretreatment with PMN reduced reactive oxygen species production and DA neuron degeneration caused by exposure to 6-hydroxydopamine (6-OHDA), and therefore significantly improved the DA-mediated food-sensing behavior of 6-OHDA-exposed worms and prolonged their lifespan. PMN also diminished the accumulation of α-synuclein in transgenic worms and transfected cells. In our study of the mechanism of action, we found that PMN lessened ARTS-mediated degradation of X-linked inhibitor of apoptosis (XIAP) by enhancing the expression of PINK1/parkin. This led to reduced 6-OHDA-induced apoptosis, enhanced activity of the ubiquitin–proteasome system, and increased autophagy, which diminished the accumulation of α-synuclein. The use of small interfering RNA to down-regulate parkin reversed the benefits of PMN in the PD models. Our findings suggest PMN as a candidate compound worthy of further evaluation for the treatment of PD.
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Affiliation(s)
- Yu-Ling Hsu
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung 40402, Taiwan; (Y.-L.H.); (H.-S.H.); (S.-P.L.); (Y.-T.C.); (W.-C.S.)
| | - Huey-Shan Hung
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung 40402, Taiwan; (Y.-L.H.); (H.-S.H.); (S.-P.L.); (Y.-T.C.); (W.-C.S.)
- Translational Medicine Research Center, China Medical University Hospital, Taichung 40447, Taiwan
| | - Chia-Wen Tsai
- Department of Nutrition, China Medical University, Taichung 40402, Taiwan;
| | - Shih-Ping Liu
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung 40402, Taiwan; (Y.-L.H.); (H.-S.H.); (S.-P.L.); (Y.-T.C.); (W.-C.S.)
- Translational Medicine Research Center, China Medical University Hospital, Taichung 40447, Taiwan
| | - Yu-Ting Chiang
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung 40402, Taiwan; (Y.-L.H.); (H.-S.H.); (S.-P.L.); (Y.-T.C.); (W.-C.S.)
| | - Yun-Hua Kuo
- Department of Nursing, Taipei Veterans General Hospital, Taipei 12217, Taiwan;
| | - Woei-Cherng Shyu
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung 40402, Taiwan; (Y.-L.H.); (H.-S.H.); (S.-P.L.); (Y.-T.C.); (W.-C.S.)
- Translational Medicine Research Center, China Medical University Hospital, Taichung 40447, Taiwan
| | - Shinn-Zong Lin
- Bioinnovation Center, Tzu Chi Foundation, Department of Neurosurgery, Buddhist Tzu Chi General Hospital, Tzu Chi University, Hualien 970, Taiwan;
| | - Ru-Huei Fu
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung 40402, Taiwan; (Y.-L.H.); (H.-S.H.); (S.-P.L.); (Y.-T.C.); (W.-C.S.)
- Translational Medicine Research Center, China Medical University Hospital, Taichung 40447, Taiwan
- Department of Psychology, Asia University, Taichung 41354, Taiwan
- Correspondence: ; Tel.: +886-422052121-7826
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Hongbo M, Yanjiao D, Shuo W, Kun S, Yanjie L, Mengmeng L. Podocyte RNF166 deficiency alleviates diabetic nephropathy by mitigating mitochondria impairment and apoptosis via regulation of CYLD signal. Biochem Biophys Res Commun 2021; 545:46-53. [PMID: 33545631 DOI: 10.1016/j.bbrc.2020.12.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 12/04/2020] [Indexed: 01/12/2023]
Abstract
Diabetic nephropathy (DN) is a major cause of renal failure in diabetic patients. RING-finger protein 166 (RNF166), composed of an N-terminal RING domain and C-terminal ubiquitin interaction motif, plays a critical role in mediating various cellular processes. However, its potential in DN has not been investigated. In the present study, we found that DN patients exhibited significantly increased expression of RNF166 in renal tissues compared with the normal individuals, and abundant RNF166 was detected in podocytes. We then showed that podocyte-conditional RNF166 knockout (RNF166cKO) markedly reduced blood glucose levels and ameliorated renal dysfunction in streptozotocin (STZ)-induced diabetic mice. Additionally, abnormal histological changes and podocyte injury were observed in STZ-induced diabetic mice, while being markedly ameliorated by RNF166cKO. Furthermore, podocyte-specific RNF166 deficiency considerably mitigated apoptosis and mitochondrial impairments in glomeruli podocytes of STZ-challenged mice through suppressing Caspase-3 cleavage and improving mitochondrial fission-associated molecules. In vitro studies further confirmed that high glucose (HG) induced mitochondrial dysfunction, along with enhanced releases of Cyto-c from mitochondria and elevated expression of cleaved Caspase-9, contributing to intrinsic apoptosis in podocytes. Intriguingly, these effects triggered by HG were dramatically ameliorated by RNF166 knockout. Mechanistically, we demonstrated that RNF166 directly interacted with cylindromatosis (CYLD), and negatively regulated CYLD expression. Notably, RNF166 knockout-attenuated mitochondrial damage and apoptosis were mainly through CYLD in podocytes upon HG stimulation. Together, all these findings provided new insights into the novel effects of RNF166 on maintaining mitochondrial function and apoptosis in podocytes during DN progression both in vivo and in vitro through interacting with CYLD, indicating that RNF166/CYLD may be an innovative therapeutic target for developing effective strategy against DN development.
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Affiliation(s)
- Ma Hongbo
- Department of Nephrology, Shandong Province Zibo Central Hospital, 54 West Communist Youth League Road, Zhangdian District, Zibo, Shandong, 255000, China.
| | - Dong Yanjiao
- Department of Nephrology, Shandong Province Zibo Central Hospital, 54 West Communist Youth League Road, Zhangdian District, Zibo, Shandong, 255000, China
| | - Wang Shuo
- Department of Nephrology, Shandong Province Zibo Central Hospital, 54 West Communist Youth League Road, Zhangdian District, Zibo, Shandong, 255000, China
| | - Sun Kun
- Department of Nephrology, Shandong Province Zibo Central Hospital, 54 West Communist Youth League Road, Zhangdian District, Zibo, Shandong, 255000, China
| | - Liu Yanjie
- Department of Nephrology, Shandong Province Zibo Central Hospital, 54 West Communist Youth League Road, Zhangdian District, Zibo, Shandong, 255000, China
| | - Li Mengmeng
- Department of Nephrology, Shandong Province Zibo Central Hospital, 54 West Communist Youth League Road, Zhangdian District, Zibo, Shandong, 255000, China
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