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Liu T, Zhang J, Chang F, Sun M, He J, Ai D. Role of endothelial Raptor in abnormal arteriogenesis after lower limb ischaemia in type 2 diabetes. Cardiovasc Res 2024; 120:1218-1234. [PMID: 38722901 DOI: 10.1093/cvr/cvae105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 03/08/2024] [Accepted: 03/17/2024] [Indexed: 09/03/2024] Open
Abstract
AIMS Proper arteriogenesis after tissue ischaemia is necessary to rebuild stable blood circulation; nevertheless, this process is impaired in type 2 diabetes mellitus (T2DM). Raptor is a scaffold protein and a component of mammalian target of rapamycin complex 1 (mTORC1). However, the role of the endothelial Raptor in arteriogenesis under the conditions of T2DM remains unknown. This study investigated the role of endothelial Raptor in ischaemia-induced arteriogenesis during T2DM. METHODS AND RESULTS Although endothelial mTORC1 is hyperactive in T2DM, we observed a marked reduction in the expression of endothelial Raptor in two mouse models and in human vessels. Inducible endothelial-specific Raptor knockout severely exacerbated impaired hindlimb perfusion and arteriogenesis after hindlimb ischaemic injury in 12-week high-fat diet fed mice. Additionally, we found that Raptor deficiency dampened vascular endothelial growth factor receptor 2 (VEGFR2) signalling in endothelial cells (ECs) and inhibited VEGF-induced cell migration and tube formation in a PTP1B-dependent manner. Furthermore, mass spectrometry analysis indicated that Raptor interacts with neuropilin 1 (NRP1), the co-receptor of VEGFR2, and mediates VEGFR2 trafficking by facilitating the interaction between NRP1 and Synectin. Finally, we found that EC-specific overexpression of the Raptor mutant (loss of mTOR binding) reversed impaired hindlimb perfusion and arteriogenesis induced by endothelial Raptor knockout in high-fat diet fed mice. CONCLUSION Collectively, our study demonstrated the crucial role of endothelial Raptor in promoting ischaemia-induced arteriogenesis in T2DM by mediating VEGFR2 signalling. Thus, endothelial Raptor is a novel therapeutic target for promoting arteriogenesis and ameliorating perfusion in T2DM.
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Affiliation(s)
- Ting Liu
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Key Laboratory of Immune Microenvironment and Disease (Ministry of Education), Tianjin Institute of Cardiology, The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics, The Second Hospital of Tianjin Medical University, Tianjin Medical University, Qixiangtai Rd 22nd, Tianjin 300070, China
| | - Jiachen Zhang
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Key Laboratory of Immune Microenvironment and Disease (Ministry of Education), Tianjin Institute of Cardiology, The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics, The Second Hospital of Tianjin Medical University, Tianjin Medical University, Qixiangtai Rd 22nd, Tianjin 300070, China
| | - Fangyuan Chang
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Key Laboratory of Immune Microenvironment and Disease (Ministry of Education), Tianjin Institute of Cardiology, The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics, The Second Hospital of Tianjin Medical University, Tianjin Medical University, Qixiangtai Rd 22nd, Tianjin 300070, China
| | - Mengyu Sun
- Research Center of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China
| | - Jinlong He
- Department of Physiology and Pathophysiology, Tianjin Medical University, Qixiangtai Rd 22nd, Tianjin 300070, China
| | - Ding Ai
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Key Laboratory of Immune Microenvironment and Disease (Ministry of Education), Tianjin Institute of Cardiology, The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics, The Second Hospital of Tianjin Medical University, Tianjin Medical University, Qixiangtai Rd 22nd, Tianjin 300070, China
- Department of Physiology and Pathophysiology, Tianjin Medical University, Qixiangtai Rd 22nd, Tianjin 300070, China
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Lee SG, Woo SM, Seo SU, Lee HS, Kim SH, Chang YC, Cho HJ, Yook S, Nam JO, Kwon TK. Non-canonical deubiquitination of OTUB1 induces IFNγ-mediated cell cycle arrest via regulation of p27 stability. Oncogene 2024; 43:1852-1860. [PMID: 38664499 PMCID: PMC11164677 DOI: 10.1038/s41388-024-03042-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 04/16/2024] [Accepted: 04/16/2024] [Indexed: 06/12/2024]
Abstract
The deubiquitinase OTUB1, implicated as a potential oncogene in various tumors, lacks clarity in its regulatory mechanism in tumor progression. Our study investigated the effects and underlying mechanisms of OTUB1 on the breast cancer cell cycle and proliferation in IFNγ stimulation. Loss of OTUB1 abrogated IFNγ-induced cell cycle arrest by regulating p27 protein expression, whereas OTUB1 overexpression significantly enhanced p27 expression even without IFNγ treatment. Tyr26 phosphorylation residue of OTUB1 directly bound to p27, modulating its post-translational expression. Furthermore, we identified crucial lysine residues (K134, K153, and K163) for p27 ubiquitination. Src downregulation reduced OTUB1 and p27 expression, suggesting that IFNγ-induced cell cycle arrest is mediated by the Src-OTUB1-p27 signaling pathway. Our findings highlight the pivotal role of OTUB1 in IFNγ-induced p27 expression and cell cycle arrest, offering therapeutic implications.
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Affiliation(s)
- Seul Gi Lee
- Department of Immunology, School of Medicine, Keimyung University, Daegu, 42601, South Korea
- Department of Microbiology, Immunology, and Cancer Biology, University of Virginia, Charlottesville, VA, 22908, USA
- Center for Forensic Pharmaceutical Science, Keimyung University, Daegu, 42601, South Korea
| | - Seon Min Woo
- Department of Immunology, School of Medicine, Keimyung University, Daegu, 42601, South Korea
| | - Seung Un Seo
- Department of Immunology, School of Medicine, Keimyung University, Daegu, 42601, South Korea
| | - Hyun Shik Lee
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, College of Natural Sciences, Kyungpook National University, Daegu, 41566, South Korea
| | - Sang Hyun Kim
- Department of Pharmacology, School of Medicine, Kyungpook National University, Daegu, 41944, South Korea
| | - Young-Chae Chang
- Research Institute of Biomedical Engineering and Department of Medicine, Catholic University of Daegu School of Medicine, Daegu, 42472, South Korea
| | - Hyo Je Cho
- Department of Biochemistry, Chungbuk National University, Cheongju, 28644, South Korea
| | - Simmyung Yook
- Department of Biopharmaceutical Convergence, Sungkyunkwan University, Suwon, 16419, South Korea
| | - Ju-Ock Nam
- Department of Food Science and Biotechnology, Kyungpook National University, Daegu, 41566, South Korea
| | - Taeg Kyu Kwon
- Department of Immunology, School of Medicine, Keimyung University, Daegu, 42601, South Korea.
- Center for Forensic Pharmaceutical Science, Keimyung University, Daegu, 42601, South Korea.
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Peng L, Wu T, Liu Y, Zhao D, He W, Yuan Y. OTUB1 accelerates hepatocellular carcinoma by stabilizing RACK1 via its non-canonical ubiquitination. Cell Oncol (Dordr) 2024; 47:987-1004. [PMID: 38315284 PMCID: PMC11219430 DOI: 10.1007/s13402-023-00913-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/23/2023] [Indexed: 02/07/2024] Open
Abstract
BACKGROUND Dysregulated ubiquitination modification occupies a pivotal role in hepatocellular carcinoma (HCC) tumorigenesis and progression. The ubiquitin aldehyde binding 1 (OTUB1) was aberrantly upregulated and exhibited the pro-tumorigenic function in HCC. However, the underlying mechanisms and responsible targets of OTUB1 remain unclear. METHODS First, bioinformatics analysis, western blot and immunohistochemistry staining were applied to analyze OTUB1 expression in HCC specimens. Then, immunoprecipitation assay-tandem mass spectrometry (MS) combined with the gene set enrichment analysis (GSEA) was used to explore the downstream target of OTUB1. Co-immunoprecipitation and ubiquitination assays were used to identify the mechanisms involved. Finally, we explored the regulatory effect of MAZ on OTUB1 through ChIP-qPCR and dual-luciferase reporter assay. RESULTS OTUB1 was broadly elevated in HCC tissues and promoted the proliferation and metastasis of HCC in vitro and in vivo. The receptor for activated C kinase 1 (RACK1) performed as a functional partner of OTUB1 and its hyperactivation was associated with aggressive development and other malignant features in HCC by activating oncogenes transcription. Mechanistically, OTUB1 directly bound to RACK1 at its C-terminal domain and decreased the K48-linked ubiquitination of RACK1 through its non-canonical suppression of ubiquitination activity, which stabilized RACK1 protein levels in HCC cells. Therefore, OTUB1 significantly increased multiple oncogenes expression and activated PI3K/AKT and FAK/ERK signaling in a RACK1-dependent manner in HCC. Moreover, the transcription factor MAZ upregulated OTUB1 expression through identifying a putative response element of OTUB1 promoter area. CONCLUSIONS Our findings might provide a new therapeutic strategy for HCC by modifying the MAZ-OTUB1-RACK1 axis.
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Affiliation(s)
- Liqun Peng
- Department of Hepatobiliary and Pancreatic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, China
- Clinical Medicine Research Center for Minimally Invasive Procedure of Hepatobiliary and Pancreatic Diseases of Hubei Province, Wuhan, China
| | - Tiangen Wu
- Department of Hepatobiliary and Pancreatic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, China
- Clinical Medicine Research Center for Minimally Invasive Procedure of Hepatobiliary and Pancreatic Diseases of Hubei Province, Wuhan, China
| | - Yingyi Liu
- Department of Hepatobiliary and Pancreatic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, China
- Clinical Medicine Research Center for Minimally Invasive Procedure of Hepatobiliary and Pancreatic Diseases of Hubei Province, Wuhan, China
| | - Dongli Zhao
- College of Life Sciences, Hubei Key Laboratory of Cell Homeostasis, Wuhan University, Wuhan, China
| | - Wenzhi He
- Department of Hepatobiliary and Pancreatic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, China.
- Clinical Medicine Research Center for Minimally Invasive Procedure of Hepatobiliary and Pancreatic Diseases of Hubei Province, Wuhan, China.
- College of Life Sciences, Hubei Key Laboratory of Cell Homeostasis, Wuhan University, Wuhan, China.
| | - Yufeng Yuan
- Department of Hepatobiliary and Pancreatic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, China.
- Clinical Medicine Research Center for Minimally Invasive Procedure of Hepatobiliary and Pancreatic Diseases of Hubei Province, Wuhan, China.
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Pan Z, Shao M, Zhao C, Yang X, Li H, Cui G, Liang X, Yu CW, Ye Q, Gao C, Di L, Chern JW, Zhou H, Lee SMY. J24335 exerts neuroprotective effects against 6-hydroxydopamine-induced lesions in PC12 cells and mice. Eur J Pharm Sci 2024; 194:106696. [PMID: 38199443 DOI: 10.1016/j.ejps.2024.106696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 01/06/2024] [Accepted: 01/07/2024] [Indexed: 01/12/2024]
Abstract
Parkinson's disease is the second most prevalent age-related neurodegenerative disease and disrupts the lives of people aged >60 years. Meanwhile, single-target drugs becoming inapplicable as PD pathogenesis diversifies. Mitochondrial dysfunction and neurotoxicity have been shown to be relevant to the pathogenesis of PD. The novel synthetic compound J24335 (11-Hydroxy-1-(8-methoxy-5-(trifluoromethyl)quinolin-2-yl)undecan-1-one oxime), which has been researched similarly to J2326, has the potential to be a multi-targeted drug and alleviate these lesions. Therefore, we investigated the mechanism of action and potential neuroprotective function of J24335 against 6-OHDA-induced neurotoxicity in mice, and in PC12 cell models. The key target of action of J24335 was also screened. MTT assay, LDH assay, flow cytometry, RT-PCR, LC-MS, OCR and ECAR detection, and Western Blot analysis were performed to characterize the neuroprotective effects of J24335 on PC12 cells and its potential mechanism. Behavioral tests and immunohistochemistry were used to evaluate behavioral changes and brain lesions in mice. Moreover, bioinformatics was employed to assess the drug-likeness of J24335 and screen its potential targets. J24335 attenuated the degradation of mitochondrial membrane potential and enhanced glucose metabolism and mitochondrial biosynthesis to ameliorate 6-OHDA-induced mitochondrial dysfunction. Animal behavioral tests demonstrated that J24335 markedly improved motor function and loss of TH-positive neurons and dopaminergic nerve fibers, and contributed to an increase in the levels of dopamine and its metabolites in brain tissue. The activation of both the CREB/PGC-1α/NRF-1/TFAM and PKA/Akt/GSK-3β pathways was a major contributor to the neuroprotective effects of J24335. Furthermore, bioinformatics predictions revealed that J24335 is a low toxicity and highly BBB permeable compound targeting 8 key genes (SRC, EGFR, ERBB2, SYK, MAPK14, LYN, NTRK1 and PTPN1). Molecular docking suggested a strong and stable binding between J24335 and the 8 core targets. Taken together, our results indicated that J24335, as a multi-targeted neuroprotective agent with promising therapeutic potential for PD, could protect against 6-OHDA-induced neurotoxicity via two potential pathways in mice and PC12 cells.
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Affiliation(s)
- Zhijian Pan
- Department of Bioengineering, Zhuhai Campus of Zunyi Medical University, Zhuhai, China
| | - Min Shao
- Department of Bioengineering, Zhuhai Campus of Zunyi Medical University, Zhuhai, China
| | - Chen Zhao
- State Key Laboratory of Quality Research in Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macau
| | - Xuanjun Yang
- Department of Food Science and Nutrition, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China
| | - Haitao Li
- Department of Bioengineering, Zhuhai Campus of Zunyi Medical University, Zhuhai, China
| | - Guozhen Cui
- Department of Bioengineering, Zhuhai Campus of Zunyi Medical University, Zhuhai, China
| | - Xiaonan Liang
- State Key Laboratory of Quality Research in Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macau
| | - Chao-Wu Yu
- School of Pharmacy, National Taiwan University, Taipei 10050, Taiwan, China
| | - Qingqing Ye
- School of Pharmacy, National Taiwan University, Taipei 10050, Taiwan, China
| | - Cheng Gao
- State Key Laboratory of Quality Research in Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macau
| | - Lijun Di
- Department of Pharmaceutical Sciences, Faculty of Health Sciences, University of Macau, Taipa, Macau, China
| | - Ji-Wang Chern
- School of Pharmacy, National Taiwan University, Taipei 10050, Taiwan, China
| | - Hefeng Zhou
- Department of Bioengineering, Zhuhai Campus of Zunyi Medical University, Zhuhai, China.
| | - Simon Ming-Yuen Lee
- State Key Laboratory of Quality Research in Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau, Macau; Department of Food Science and Nutrition, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China.
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Wu M, Sun L, Song T. OTUB1-mediated inhibition of ubiquitination: a growing list of effectors, multiplex mechanisms, and versatile functions. Front Mol Biosci 2024; 10:1261273. [PMID: 38264570 PMCID: PMC10803509 DOI: 10.3389/fmolb.2023.1261273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 12/19/2023] [Indexed: 01/25/2024] Open
Abstract
Protein ubiquitination plays a pivotal role in protein homeostasis. Ubiquitination may regulate the stability, activity, protein-protein interaction, and localization of a protein. Ubiquitination is subject to regulation by two groups of counteracting enzymes, the E3 ubiquitin ligases and deubiquitinases. Consistently, deubiquitinases are involved in essentially all biological processes. OTUB1, an OTU-family deubiquitinase, is a critical regulator of development, cancer, DNA damage response, and immune response. OTUB1 antagonizes the ubiquitination of a wide-spectrum of proteins through at least two different mechanisms. Besides direct deubiquitination, OTUB1 can also inhibit ubiquitination by non-canonically blocking ubiquitin transfer from certain ubiquitin-conjugases (E2). In this review, we start with a general background of protein ubiquitination and deubiquitination. Next, we introduce the basic characteristics of OTUB1 and then elaborate on the updated biological functions of OTUB1. Afterwards, we discuss potential mechanisms underlying the versatility and specificity of OTUB1 functions. In the end, we discuss the perspective that OTUB1 can be a potential therapeutic target for cancer.
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Affiliation(s)
- Miaomiao Wu
- Deparment of Obstetrics and Gynecology, Shuyang Hospital of Traditional Chinese Medicine, Suqian, China
| | - Lidong Sun
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
- Cell Architecture Research Institute, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Tanjing Song
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
- Cell Architecture Research Institute, Huazhong University of Science and Technology, Wuhan, Hubei, China
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6
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Xing Y, Ba-Tu J, Dong C, Cao X, Li B, Jia X, Juan Y, Lv X, Zhang H, Qin N, Han W, Wang D, Qi X, Wang Y, Hao X, Zhang S, Du X, Wang H, Wang M. Phosphorylation of USP27X by GSK3β maintains the stability and oncogenic functions of CBX2. Cell Death Dis 2023; 14:782. [PMID: 38030604 PMCID: PMC10687032 DOI: 10.1038/s41419-023-06304-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 10/25/2023] [Accepted: 11/13/2023] [Indexed: 12/01/2023]
Abstract
Chromobox protein homolog 2 (CBX2) exerts a multifaceted impact on the progression of aggressive cancers. The proteasome-dependent pathway is crucial for modulating CBX2 regulation, while the specific regulatory roles and mechanisms of deubiquitinating enzymes targeting CBX2 remain poorly understood. Mass spectrometry analysis identified ubiquitin-specific peptidase 27X (USP27X) as a deubiquitinating enzyme that targets CBX2. Overexpression of USP27X significantly enhances CBX2 levels by promoting deubiquitination, while deficiency of USP27X leads to CBX2 degradation, thereby inhibiting tumorigenesis. Furthermore, it has been revealed that glycogen synthase kinase 3 beta (GSK3β) can directly bind to and phosphorylate USP27X, thereby enhancing the interaction between USP27X and CBX2 and leading to further stabilization of the CBX2 protein. Clinically, the co-expression of high levels of USP27X and CBX2 in breast cancer tissues is indicative of a poor prognosis for patients with this disease. These findings collectively underscore the critical regulatory role played by USP27X in modulating CBX2, thereby establishing the GSK3β-USP27X-CBX2 axis as a pivotal driver of malignant progression in breast cancer.
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Affiliation(s)
- Yushu Xing
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
- The Center for New Drug Safety Evaluation and Research, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Jirimu Ba-Tu
- Medical Innovation Center for Nationalities, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Chongyang Dong
- College of Traditional Chinese Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Xiaodong Cao
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
- The Center for New Drug Safety Evaluation and Research, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Bing Li
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Xin Jia
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Yu Juan
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Xiaojie Lv
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Huiwen Zhang
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Na Qin
- College of Mongolian Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Wuri Han
- College of Mongolian Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Dongfeng Wang
- College of Traditional Chinese Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Xiao Qi
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Yutong Wang
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Xulu Hao
- College of Traditional Chinese Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Shuang Zhang
- College of Traditional Chinese Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Xiaoli Du
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China.
- The Center for New Drug Safety Evaluation and Research, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China.
| | - Huanyun Wang
- College of Pharmacy, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China.
| | - Minjie Wang
- Medical Experimental Center of Basic Medical School, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China.
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Song SR, Seo SU, Woo SM, Yoon JY, Yook S, Kwon TK. Tubeimoside-1 Enhances TRAIL-Induced Apoptotic Cell Death through STAMBPL1-Mediated c-FLIP Downregulation. Int J Mol Sci 2023; 24:11840. [PMID: 37511599 PMCID: PMC10380985 DOI: 10.3390/ijms241411840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 07/20/2023] [Accepted: 07/22/2023] [Indexed: 07/30/2023] Open
Abstract
Tubeimoside-1 (TBMS-1), a traditional Chinese medicinal herb, is commonly used as an anti-cancer agent. In this study, we aimed to investigate its effect on the sensitization of cancer cells to tumor necrosis factor-related apoptosis-inducing ligand (TRAIL). Our results revealed that even though monotherapy using TBMS-1 or TRAIL at sublethal concentrations did not affect cancer cell death, combination therapy using TBMS-1 and TRAIL increased apoptotic cell death. Mechanistically, TBMS-1 destabilized c-FLIP expression by downregulating STAMBPL1, a deubiquitinase (DUB). Specifically, when STAMBPL1 and c-FLIP bound together, STAMBPL1 deubiquitylated c-FLIP. Moreover, STAMBPL1 knockdown markedly increased sensitivity to TRAIL by destabilizing c-FLIP. These findings were further confirmed in vivo using a xenograft model based on the observation that combined treatment with TBMS-1 and TRAIL decreased tumor volume and downregulated STAMBPL1 and c-FLIP expression levels. Overall, our study revealed that STAMBPL1 is essential for c-FLIP stabilization, and that STAMBPL1 depletion enhances TRAIL-mediated apoptosis via c-FLIP downregulation.
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Affiliation(s)
- So Rae Song
- Department of Immunology, School of Medicine, Keimyung University, Daegu 42601, Republic of Korea
| | - Seung Un Seo
- Department of Immunology, School of Medicine, Keimyung University, Daegu 42601, Republic of Korea
| | - Seon Min Woo
- Department of Immunology, School of Medicine, Keimyung University, Daegu 42601, Republic of Korea
| | - Ji Yun Yoon
- Department of Immunology, School of Medicine, Keimyung University, Daegu 42601, Republic of Korea
| | - Simmyung Yook
- College of Pharmacy, Keimyung University, Daegu 42601, Republic of Korea
| | - Taeg Kyu Kwon
- Department of Immunology, School of Medicine, Keimyung University, Daegu 42601, Republic of Korea
- Center for Forensic Pharmaceutical Science, Keimyung University, Daegu 42601, Republic of Korea
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8
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Seo SU, Woo SM, Kwon TK. Cathepsin K inhibition induces Raptor destabilization and mitochondrial dysfunction via Syk/SHP2/Src/OTUB1 axis-mediated signaling. Cell Death Dis 2023; 14:366. [PMID: 37330581 PMCID: PMC10276854 DOI: 10.1038/s41419-023-05884-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Revised: 04/11/2023] [Accepted: 06/08/2023] [Indexed: 06/19/2023]
Abstract
The Raptor signaling pathway is a critical point of intervention in the invasion and progression of cancer. The non-receptor tyrosine kinase Src-mediated phosphorylation of OTUB1-Y26 plays a critical role in Raptor stabilization, whereas cathepsin K inhibitor (odanacatib; ODN) and knockdown (siRNA) induce Raptor destabilization. However, the mechanisms involved in cathepsin K inhibition-induced OTUB1-Y26 phosphorylation in Raptor stabilization have not been yet elucidated. This study showed that cathepsin K inhibition activates SHP2, a tyrosine phosphatase, that dephosphorylates OTUB1 and destabilizes Raptor, whereas SHP2 deletion and pharmacological inhibition increase OTUB1-Y26 phosphorylation and Raptor expression. SHP2 deletion also led to the inhibition of ODN-induced mitochondrial ROS, fusion, and dysfunction. Furthermore, cathepsin K inhibition phosphorylated spleen tyrosine kinase (Syk) at Y525 and Y526, resulting in the SHP2-mediated dephosphorylation of OTUB1-Y26. Collectively, our findings identified Syk not only as an upstream tyrosine kinase required for SHP2 activation but also showed a critical mechanism that regulates ODN-induced Raptor downregulation and mitochondrial dysfunction. In conclusion, Syk/SHP2/Src/OTUB1 axis-mediated signaling can act as a therapeutic target in cancer management.
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Affiliation(s)
- Seung Un Seo
- Department of Immunology, School of Medicine, Keimyung University, Daegu, 42601, South Korea
| | - Seon Min Woo
- Department of Immunology, School of Medicine, Keimyung University, Daegu, 42601, South Korea
| | - Taeg Kyu Kwon
- Department of Immunology, School of Medicine, Keimyung University, Daegu, 42601, South Korea.
- Center for Forensic Pharmaceutical Science, Keimyung University, Daegu, 42601, South Korea.
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Goel RK, Kim N, Lukong KE. Seeking a better understanding of the non-receptor tyrosine kinase, SRMS. Heliyon 2023; 9:e16421. [PMID: 37251450 PMCID: PMC10220380 DOI: 10.1016/j.heliyon.2023.e16421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 05/14/2023] [Accepted: 05/16/2023] [Indexed: 05/31/2023] Open
Abstract
SRMS (Src-Related kinase lacking C-terminal regulatory tyrosine and N-terminal Myristoylation Sites) is a non-receptor tyrosine kinase first reported in a 1994 screen for genes regulating murine neural precursor cells. SRMS, pronounced "Shrims", lacks the C-terminal regulatory tyrosine critical for the regulation of the enzymatic activity of Src-family kinases (SFKs). Another remarkable characteristic of SRMS is its localization into distinct SRMS cytoplasmic punctae (SCPs) or GREL (Goel Raghuveera-Erique Lukong) bodies, a pattern not observed in the SFKs. This unique subcellular localization of SRMS could dictate its cellular targets, proteome, and potentially, substrates. However, the function of SRMS is still relatively unknown. Further, how is its activity regulated and by what cellular targets? Studies have emerged highlighting the potential role of SRMS in autophagy and in regulating the activation of BRK/PTK6. Potential novel cellular substrates have also been identified, including DOK1, vimentin, Sam68, FBKP51, and OTUB1. Recent studies have also demonstrated the potential role of the kinase in various cancers, including gastric and colorectal cancers and platinum resistance in ovarian cancer. This review discusses the advancements made in SRMS-related biology to date and the path to understanding the cellular and physiological significance of the kinase.
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Affiliation(s)
- Raghuveera Kumar Goel
- Center for Network Systems Biology, Boston University, Boston, MA, USA
- Department of Biochemistry, Boston University School of Medicine, Boston, MA, USA
| | - Nayoung Kim
- Department of Biochemistry, Microbiology, and Immunology, 107 Wiggins Road, Health Sciences Building, University of Saskatchewan, Saskatoon S7N 5E5, Saskatchewan, Canada
| | - Kiven Erique Lukong
- Department of Biochemistry, Microbiology, and Immunology, 107 Wiggins Road, Health Sciences Building, University of Saskatchewan, Saskatoon S7N 5E5, Saskatchewan, Canada
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