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Feng Z, Ou Y, Deng X, Deng M, Yan X, Chen L, Zhou F, Hao L. Deubiquitinase USP10 promotes osteosarcoma autophagy and progression through regulating GSK3β-ULK1 axis. Cell Biosci 2024; 14:111. [PMID: 39218913 PMCID: PMC11367994 DOI: 10.1186/s13578-024-01291-9] [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: 04/10/2024] [Accepted: 08/15/2024] [Indexed: 09/04/2024] Open
Abstract
BACKGROUND Deubiquitinating enzymes (DUBs) are pivotal in maintaining cell homeostasis by regulating substrate protein ubiquitination in both healthy and cancer cells. Ubiquitin-specific protease 10 (USP10) belongs to the DUB family. In this study, we investigated the clinical and pathological significance of USP10 and Unc-51-like autophagy activating kinase 1 (ULK1) in osteosarcoma (OS), as well as the mechanism of USP10 action in ULK1-mediated autophagy and disease progression. RESULTS The analysis of OS and adjacent normal tissues demonstrated that USP10 and ULK1 were significantly overexpressed in OS, and a positive association between their expression and malignant properties was observed. USP10 knockdown in OS cells reduced ULK1 mRNA and protein expression, whereas USP10 overexpression increased ULK1 mRNA and protein expression. In vitro experiments showed that USP10 induced autophagy, cell proliferation, and invasion by enhancing ULK1 expression in OS cell lines. Furthermore, we found that the regulation of ULK1-mediated autophagy, cell proliferation, and invasion in OS by USP10 was dependent on glycogen synthase kinase 3β (GSK3β) activity. Mechanistically, USP10 promoted ULK1 transcription by interacting with and stabilising GSK3β through deubiquitination, which, in turn, increased the activity of the ULK1 promoter, thereby accelerating OS progression. Using a xenograft mouse model, we showed that Spautin-1, a small-molecule inhibitor targeting USP10, significantly reduced OS development, with its anti-tumour activity significantly enhanced when combined with the chemotherapeutic agent cisplatin. CONCLUSION Collectively, we demonstrated that the USP10-GSK3β-ULK1 axis promoted autophagy, cell proliferation, and invasion in OS. The findings imply that targeting USP10 may offer a promising therapeutic avenue for treating OS.
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Affiliation(s)
- Zuxi Feng
- Departments of Orthopedics, the 2st Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, 330000, Jiangxi Province, China
| | - Yanghuan Ou
- Departments of Orthopedics, the 2st Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, 330000, Jiangxi Province, China
| | - Xueqiang Deng
- Departments of Orthopedics, the 2st Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, 330000, Jiangxi Province, China
| | - Minghao Deng
- Nottingham Trent University, Clifton, Nottingham, NG11 8NS, UK
| | - Xiaohua Yan
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Nanchang University Jiangxi Medical College, Nanchang, 330031, China
| | - Leifeng Chen
- Department of Oncology, The Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China.
- Medical Center for Cardiovascular Diseases, Neurological Diseases and Tumors of Jiangxi Province, The Second Affiliated Hospital of Nanchang University, Nanchang, 330006, China.
- Laboratory of Translational Medicine, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China.
| | - Fan Zhou
- Department of General Surgery, The Second Affiliated Hospital of Nanchang University, 1 Minde Road, Nanchang, 330006, Jiangxi, People's Republic of China.
| | - Liang Hao
- Departments of Orthopedics, the 2st Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, 330000, Jiangxi Province, China.
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Li Q, Wang Z, Wang J, Wang J, Zheng X, Li D, Wang Z, Li J, Li Y. Regulatory feedback loop between circ-EIF4A3 and EIF4A3 Enhances autophagy and growth in colorectal cancer cells. Transl Oncol 2024; 46:101996. [PMID: 38795560 PMCID: PMC11153236 DOI: 10.1016/j.tranon.2024.101996] [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: 08/01/2023] [Revised: 04/29/2024] [Accepted: 05/10/2024] [Indexed: 05/28/2024] Open
Abstract
Recent studies indicate that circular RNAs (circRNAs) are crucial in the progression of colorectal cancer (CRC). Eukaryotic translation initiation factor 4A3 (EIF4A3) has been identified as a promoter of circRNA production. The biological roles and mechanisms of EIF4A3-derived circRNA (circEIF4A3) in CRC cell autophagy remain poorly understood. This study explores the effects of circEIF4A3 on CRC cell growth and autophagy, aiming to elucidate the underlying molecular mechanisms. We discovered that EIF4A3 and circEIF4A3 synergistically enhance CRC cell growth. CircEIF4A3 sequesters miR-3126-5p, consequently upregulating EIF4A3. Further, circEIF4A3 increases EIF4A3 expression, which promotes autophagy by stabilizing ATG5 mRNA and enhances ATG7 protein stability through the stabilization of USP14 mRNA, a deubiquitinating enzyme. Upregulation of ATG5 and ATG7 counteracts the growth-inhibitory effects of EIF4A3 knockdown on CRC cells. Moreover, our findings demonstrate that EIF4A3 induces the formation of circEIF4A3 in CRC cells. In conclusion, a positive feedback loop between circEIF4A3 and EIF4A3 supports CRC cell growth by facilitating autophagy.
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Affiliation(s)
- Qingke Li
- Department of Gastrointestinal Surgery, Tangshan People's Hospital, Tangshan 063000, Hebei, China
| | - Zhiwu Wang
- Department of Chemoradiotherapy, Tangshan People's Hospital, Tangshan 063000, Hebei, China
| | - Jian Wang
- Department of Gastrointestinal Surgery, Tangshan People's Hospital, Tangshan 063000, Hebei, China
| | - Jiangong Wang
- Department of Chemoradiotherapy, Tangshan People's Hospital, Tangshan 063000, Hebei, China
| | - Xuan Zheng
- Hebei Key Laboratory of Molecular Oncology, Tangshan 063001, Hebei, China; The Cancer Institute, Tangshan People's Hospital, Tangshan 063001, Hebei, China; Tangshan Key Laboratory of Cancer Prevention and Treatment, Tangshan 063001, Hebei, China
| | - Dan Li
- Hebei Key Laboratory of Molecular Oncology, Tangshan 063001, Hebei, China; The Cancer Institute, Tangshan People's Hospital, Tangshan 063001, Hebei, China; Tangshan Key Laboratory of Cancer Prevention and Treatment, Tangshan 063001, Hebei, China
| | - Zhuo Wang
- Hebei Key Laboratory of Molecular Oncology, Tangshan 063001, Hebei, China; The Cancer Institute, Tangshan People's Hospital, Tangshan 063001, Hebei, China; Tangshan Key Laboratory of Cancer Prevention and Treatment, Tangshan 063001, Hebei, China
| | - Jingwu Li
- Department of Gastrointestinal Surgery, Tangshan People's Hospital, Tangshan 063000, Hebei, China; Hebei Key Laboratory of Molecular Oncology, Tangshan 063001, Hebei, China; The Cancer Institute, Tangshan People's Hospital, Tangshan 063001, Hebei, China.
| | - Yufeng Li
- Hebei Key Laboratory of Molecular Oncology, Tangshan 063001, Hebei, China; The Cancer Institute, Tangshan People's Hospital, Tangshan 063001, Hebei, China; Tangshan Key Laboratory of Cancer Prevention and Treatment, Tangshan 063001, Hebei, China.
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Lieu DJ, Crowder MK, Kryza JR, Tamilselvam B, Kaminski PJ, Kim IJ, Li Y, Jeong E, Enkhbaatar M, Chen H, Son SB, Mok H, Bradley KA, Phillips H, Blanke SR. Autophagy suppression in DNA damaged cells occurs through a newly identified p53-proteasome-LC3 axis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.21.595139. [PMID: 38826216 PMCID: PMC11142043 DOI: 10.1101/2024.05.21.595139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2024]
Abstract
Macroautophagy is thought to have a critical role in shaping and refining cellular proteostasis in eukaryotic cells recovering from DNA damage. Here, we report a mechanism by which autophagy is suppressed in cells exposed to bacterial toxin-, chemical-, or radiation-mediated sources of genotoxicity. Autophagy suppression is directly linked to cellular responses to DNA damage, and specifically the stabilization of the tumor suppressor p53, which is both required and sufficient for regulating the ubiquitination and proteasome-dependent reduction in cellular pools of microtubule-associated protein 1 light chain 3 (LC3A/B), a key precursor of autophagosome biogenesis and maturation, in both epithelial cells and an ex vivo organoid model. Our data indicate that suppression of autophagy, through a newly identified p53-proteasome-LC3 axis, is a conserved cellular response to multiple sources of genotoxicity. Such a mechanism could potentially be important for realigning proteostasis in cells undergoing DNA damage repair.
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Wu M, Ying J, Lin X, Xu C, Zheng X, Zheng Y, Fang Z, Yan B, Zhang N, Mou Y, Tan F. Toxoplasma gondii autophagy-related protein ATG7 maintains apicoplast inheritance by stabilizing and lipidating ATG8. Biochim Biophys Acta Mol Basis Dis 2024; 1870:166891. [PMID: 37739091 DOI: 10.1016/j.bbadis.2023.166891] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 09/12/2023] [Accepted: 09/19/2023] [Indexed: 09/24/2023]
Abstract
ATG8/LC3-mediated autophagosome formation is a key rate-limiting step in the process of autophagy. The parasitic protist Toxoplasma gondii possesses a single ATG8 homolog (TgATG8), which can localize to either cytosolic autophagosome involved in delivery of autophagic material in bradyzoites, or the outermost membrane of apicoplast, a nonphotosynthetic plastid-like organelle, responsible for maintaining homeostasis in tachyzoites. However, mechanisms that regulate TgATG8 remain insufficiently understood. Here, a TgATG7 conditional knockdown line that we have generated is severely impaired in parasite's growth and exhibits significant defects in the organelle level, strikingly with a fragmentation of the mitochondrial network and a loss of the apicoplast. Specific TgATG7C1133S point mutant complemented line showed that these defects were associated with its E1-type enzyme activity. Both depletion of TgATG7 and mutation of its catalytic cysteine 1133 hindered TgATG8 lipidation and apicoplast localization. Unexpectedly, we also found that depletion of TgATG7 reduced the unlipidated TgATG8 protein level. Subsequently, we determined that TgATG7 was able to interact with TgATG8 directly via its C-terminal domain and multi-monoubiquitination stimulated proteasome-dependent degradation of TgATG8, while TgATG7 could inhibit the degradation through stabilization of TgATG8. Additionally, we identified a putative TgATG8 interacting fragment of TgATG7, 1281-1290aa. Depletion of the fragment impaired the parasite growth and apicoplast inheritance. To our knowledge, our study is the first to elucidate the role of TgATG7 and the ubiquitin-proteasome system in synergistically regulating the non-lipidated pool of TgATG8, suggesting a potential homeostatic mechanism responsible for balancing autophagic activity in T. gondii.
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Affiliation(s)
- Mimi Wu
- The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou Medical University, Wenzhou, Zhejiang, China; Department of Parasitology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jiaqi Ying
- School of the Second Clinical Medical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Xuejing Lin
- Department of Parasitology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Chao Xu
- The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Xiaozi Zheng
- Teaching Center of Morphological Experiment, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Yi Zheng
- Laser Confocal Microscope Lab, School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Zhouxi Fang
- Zhejiang Provincial Key Laboratory for Technology and Application of Model Organisms, Key Laboratory of Laboratory Medicine, Ministry of Education, School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Baolong Yan
- Department of Parasitology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Nu Zhang
- The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou Medical University, Wenzhou, Zhejiang, China.
| | - Yani Mou
- Department of Parasitology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China.
| | - Feng Tan
- The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou Medical University, Wenzhou, Zhejiang, China; Department of Parasitology, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China.
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5
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Vozandychova V, Rehulka P, Hercik K, Spidlova P, Pavlik P, Hanus J, Hadravova R, Stulik J. Modified activities of macrophages' deubiquitinating enzymes after Francisella infection. Front Immunol 2023; 14:1252827. [PMID: 37841261 PMCID: PMC10570801 DOI: 10.3389/fimmu.2023.1252827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 09/14/2023] [Indexed: 10/17/2023] Open
Abstract
Francisella tularensis influences several host molecular/signaling pathways during infection. Ubiquitination and deubiquitination are among the most important regulatory mechanisms and respectively occur through attachment or removal of the ubiquitin molecule. The process is necessary not only to mark molecules for degradation, but also, for example, to the activation of signaling pathways leading to pro-inflammatory host response. Many intracellular pathogens, including Francisella tularensis, have evolved mechanisms of modifying such host immune responses to escape degradation. Here, we describe that F. tularensis interferes with the host's ubiquitination system. We show increased total activity of deubiquitinating enzymes (DUBs) in human macrophages after infection, while confirm reduced enzymatic activities of two specific DUBs (USP10 and UCH-L5), and demonstrate increased activity of USP25. We further reveal the enrichment of these three enzymes in exosomes derived from F. tularensis-infected cells. The obtained results show the regulatory effect on ubiquitination mechanism in macrophages during F. tularensis infection.
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Affiliation(s)
- Vera Vozandychova
- Department of Molecular Pathology and Biology, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czechia
| | - Pavel Rehulka
- Department of Molecular Pathology and Biology, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czechia
| | - Kamil Hercik
- Department of Molecular Pathology and Biology, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czechia
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czechia
| | - Petra Spidlova
- Department of Molecular Pathology and Biology, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czechia
| | - Pavla Pavlik
- Department of Molecular Pathology and Biology, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czechia
| | - Jaroslav Hanus
- Department of Chemical Engineering, University of Chemistry and Technology, Prague, Czechia
| | - Romana Hadravova
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czechia
| | - Jiri Stulik
- Department of Molecular Pathology and Biology, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czechia
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Cen X, Li Z, Chen X. Ubiquitination in the regulation of autophagy. Acta Biochim Biophys Sin (Shanghai) 2023; 55:1348-1357. [PMID: 37587758 PMCID: PMC10520486 DOI: 10.3724/abbs.2023149] [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: 04/08/2023] [Accepted: 06/01/2023] [Indexed: 08/18/2023] Open
Abstract
Autophagy, an efficient and effective approach to clear rapidly damaged organelles, macromolecules, and other harmful cellular components, enables the recycling of nutrient materials and supply of nutrients to maintain cellular homeostasis. Ubiquitination plays an important regulatory role in autophagy. This paper summarizes the most recent progress in ubiquitin modification in various stages of autophagy, including initiation, elongation, and termination. Moreover, this paper shows that ubiquitination is an important way through which selective autophagy achieves substrate specificity. Furthermore, we note the distinction between monoubiquitination and polyubiquitination in the regulation of autophagy. Compared with monoubiquitination, polyubiquitination is a more common strategy to regulate the activity of the autophagy molecular machinery. In addition, the role of ubiquitination in the closure and fusion of autophagosomes warrants further study. This article not only clarifies the regulatory mechanism of autophagy but also contributes to a deeper understanding of the importance of ubiquitination modification.
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Affiliation(s)
- Xueyan Cen
- Hubei Key laboratory of Edible Wild Plants Conservation & UtilizationHubei Engineering Research Center of Special Wild Vegetables Breeding and Comprehensive Utilization TechnologySchool of Life ScienceHubei Normal UniversityHuangshi435002China
| | - Ziling Li
- Hubei Key laboratory of Edible Wild Plants Conservation & UtilizationHubei Engineering Research Center of Special Wild Vegetables Breeding and Comprehensive Utilization TechnologySchool of Life ScienceHubei Normal UniversityHuangshi435002China
| | - Xinpeng Chen
- Hubei Key laboratory of Edible Wild Plants Conservation & UtilizationHubei Engineering Research Center of Special Wild Vegetables Breeding and Comprehensive Utilization TechnologySchool of Life ScienceHubei Normal UniversityHuangshi435002China
- National Laboratory of BiomacromoleculesCAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing100101China
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7
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Zhang C, Zhao X, Wang Z, Gong T, Zhao H, Zhang D, Niu Y, Li X, Zhao X, Li G, Dong X, Zhang L, Liu C, Xu J, Yu B. Dasatinib in combination with BMS-754807 induce synergistic cytotoxicity in lung cancer cells through inhibiting lung cancer cell growth, and inducing autophagy as well as cell cycle arrest at the G1 phase. Invest New Drugs 2023:10.1007/s10637-023-01360-9. [PMID: 37097369 DOI: 10.1007/s10637-023-01360-9] [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: 03/28/2023] [Accepted: 04/10/2023] [Indexed: 04/26/2023]
Abstract
Lung cancer is the leading cause of cancer-related deaths worldwide. Combination of drugs targeting independent signaling pathways would effectively block the proliferation of cancer cells with lower concentrations and stronger synergy effects. Dasatinib, a multi-targeted protein tyrosine kinase inhibitor targeting BCR-ABL and kinases of SRC family, has been successfully applied in the treatment of chronic myeloid leukemia (CML). BMS-754807, an inhibitor targeting the insulin-like growth factor 1 receptor (IGF-IR) and insulin receptor (IR) family kinases, has been in phase I development for the treatment of a variety of human cancers. Herein, we demonstrated that dasatinib in combination with BMS-754807 inhibited lung cancer cell growth, while induced autophagy as well as cell cycle arrest at the G1 phase. Dasatinib in combination with BMS-754807 suppressed the expression of cell cycle marker proteins, Rb, p-Rb, CDK4, CDK6 and Cyclin D1, and the PI3K/Akt/mTOR signaling pathway. Dasatinib in combination with BMS-754807 induced autophagy in lung cancer cells, evidenced by the upregulation of LC3B II and beclin-1, the downregulation of LC3B I and SQSTM1/p62, and the autophagic flux observed with a confocal fluorescence microscopy. Furthermore, dasatinib (18 mg/kg) in combination with BMS-754807 (18 mg/kg) inhibited the growth of tumors in NCI-H3255 xenografts without changing the bodyweight. Overall, our results suggest that dasatinib in combination with BMS-754807 inhibits the lung cancer cell proliferation in vitro and tumor growth in vitro, which indicates promising evidence for the application of the drug combination in lung cancer therapy.
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Grants
- 20210302124183, 201701D121165, 201901D111190 Natural Science Basic Project of Shanxi Province, China
- KLMEC/SXMU-202011 Open Fund from Key Laboratory of Cellular Physiology (Shanxi Medical University), Ministry of Education, China
- 1331KSC Shanxi '1331 Project' Key Subjects Construction, China
- 2019059 Scientific research project of Shanxi Provincial Health Commission, China
- 2020-194 and 2021-165 Research Project Supported by Shanxi Scholarship Council of China
- 30901821 and 81172136 National Natural Science Foundation of China
- 201901D211547 Outstanding Youth Foundation of Shanxi Province, China
- 2021YZ03 "136" College-level open fund, China
- 2021L339 Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi
- 201801D221069 Natural Science Foundation for Young Scientists of Shanxi Province, China
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Affiliation(s)
- Chan Zhang
- Department of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, 030001, China
- Cancer Center, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, 030032, China
| | - Xinan Zhao
- Department of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, 030001, China
| | - Zifeng Wang
- Department of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, 030001, China
| | - Tao Gong
- Department of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, 030001, China
| | - Hong Zhao
- Department of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, 030001, China
| | - Dong Zhang
- Department of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, 030001, China
| | - Yuhu Niu
- Department of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, 030001, China
| | - Xiaoning Li
- Department of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, 030001, China
| | - Xuhua Zhao
- Department of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, 030001, China
| | - Gaopeng Li
- General Surgery Department, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, 030032, China
| | - Xiushan Dong
- General Surgery Department, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, 030032, China
| | - Li Zhang
- Department of General Surgery, The First Hospital of Shanxi Medical University, Taiyuan, 030001, China
| | - Chang Liu
- Department of Biochemistry and Molecular Biology, Changzhi Medical College, Changzhi, 046000, China.
| | - Jun Xu
- Department of General Surgery, The First Hospital of Shanxi Medical University, Taiyuan, 030001, China.
| | - Baofeng Yu
- Department of Biochemistry and Molecular Biology, Shanxi Medical University, Taiyuan, 030001, China.
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Xin SL, Pan XL, Xu XY, Yu YY. USP10 Alleviates Palmitic Acid-induced Steatosis through Autophagy in HepG2 Cells. J Clin Transl Hepatol 2023; 11:45-57. [PMID: 36406315 PMCID: PMC9647103 DOI: 10.14218/jcth.2022.00060] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Revised: 03/03/2022] [Accepted: 03/21/2022] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND AND AIMS Nonalcoholic fatty liver disease (NAFLD) is a common chronic liver disease caused by over-nutrition. Impaired autophagy is closely related to NAFLD progression. Recently, ubiquitin-specific peptidase-10 (USP10) was reported to ameliorate hepatic steatosis, but the underlying mechanism is still unclear. In view of the potential effects of USP10 on autophagy, we investigated whether USP10 alleviated steatosis through autophagy. METHODS HepG2 cells were treated with palmitic acid (PA) to model NAFLD in vitro. Lentivirus was used to regulate USP10 level in cells. Autophagic regulators were used to autophagic progression in cells. Western blotting, real-time fluorescence quantitative polymerase chain reaction, lipid drop staining and immunofluorescent staining were performed to determine the effect of USP10 on lipid autophagy. Student's t-test and Tukey's post hoc test were used to compare the means among groups. RESULTS PA induced cellular steatosis with dependance on autophagy. USP10 overexpression alleviated PA-induced steatosis, restored autophagic activity, promoted autophagic flux, including synthesis and degradation of autophagosomes, and lipid-targeted autophagy. In the presence of autophagy inhibitors, the protective effectiveness of USP10 on steatosis decreased. Furthermore, the specific inhibitor to C-jun N-terminal protein kinase-1 (JNK1), DB07268, abolished USP10-induced autophagy. However, during early stage inhibition of JNK1, compensatory expression of tuberous sclerosis complex-2 (TSC2) maintained autophagy. The degree of TSC2-to-JNK1 compensation was positively associated with USP10 level. Functionally, JNK1 and TSC2 were involved in the lipid-lowering effect of USP10. CONCLUSIONS USP10 alleviated hepatocellular steatosis in autophagy-dependent manner. JNK1/TSC2 signaling pathways were required for USP10-induced autophagy.
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Affiliation(s)
- Sheng-Liang Xin
- Department of Infectious Diseases, Peking University First Hospital, Beijing, China
| | - Xiao-Li Pan
- Division of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xiao-Yuan Xu
- Department of Infectious Diseases, Peking University First Hospital, Beijing, China
| | - Yan-Yan Yu
- Department of Infectious Diseases, Peking University First Hospital, Beijing, China
- Correspondence to: Yan-Yan Yu, Department of Infectious Diseases, Peking University First Hospital, Xishiku Street NO.8, Beijing 100034, China. ORCID: https://orcid.org/0000-0002-7557-1305. Tel: +86-10-66551066, Fax: +86-10-83572022, E-mail:
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9
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Reid SE, Kolapalli SP, Nielsen TM, Frankel LB. Canonical and non-canonical roles for ATG8 proteins in autophagy and beyond. Front Mol Biosci 2022; 9:1074701. [PMID: 36601581 PMCID: PMC9806848 DOI: 10.3389/fmolb.2022.1074701] [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: 10/19/2022] [Accepted: 11/29/2022] [Indexed: 12/23/2022] Open
Abstract
During autophagy, the ATG8 family proteins have several well-characterized roles in facilitating early, mid, and late steps of autophagy, including autophagosome expansion, cargo recruitment and autophagosome-lysosome fusion. Their discovery has importantly allowed for precise experimental monitoring of the pathway, bringing about a huge expansion of research in the field over the last decades. In this review, we discuss both canonical and non-canonical roles of the autophagic lipidation machinery, with particular focus on the ATG8 proteins, their post-translational modifications and their increasingly uncovered alternative roles mediated through their anchoring at different membranes. These include endosomes, macropinosomes, phagosomes and the plasma membrane, to which ATG8 proteins can bind through canonical or alternative lipidation. Beyond new ATG8 binding partners and cargo types, we also explore several open questions related to alternative outcomes of autophagic machinery engagement beyond degradation. These include their roles in plasma membrane repair and secretion of selected substrates as well as the physiological implications hereof in health and disease.
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Affiliation(s)
| | | | | | - Lisa B. Frankel
- Danish Cancer Society Research Center, Copenhagen, Denmark,Biotech Research and Innovation Center, University of Copenhagen, Copenhagen, Denmark,*Correspondence: Lisa B. Frankel,
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10
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Effects on Autophagy of Moxibustion at Governor Vessel Acupoints in APP/PS1double-Transgenic Alzheimer's Disease Mice through the lncRNA Six3os1/miR-511-3p/AKT3 Molecular Axis. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2022; 2022:3881962. [PMID: 36248429 PMCID: PMC9556209 DOI: 10.1155/2022/3881962] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 09/22/2022] [Indexed: 12/03/2022]
Abstract
OBJECTIVE To explore the effect and mechanism of moxibustion at acupoints of the governor vessel on lncRNA Six3os1 in amyloid precursor protein/presenilin1 (APP/PS1) double-transgenic Alzheimer's disease (AD) mice. METHODS Twenty-four specific pathogen-free and APP/PS1 double-transgenic male mice were randomly allocated into the AD model and moxibustion groups, with 12 cases in each group. Twelve syngeneic C57BL/6J mice were selected as the control group. Mice in the moxibustion group received aconite cake-separated moxibustion at the Baihui acupoint. Suspension moxibustion was applied at Fengfu and Dazhui for 15 minutes each day. All treatments were conducted over two weeks. Control and AD model mice were routinely fed without any intervention. Behavioral observation tests were conducted before and after the intervention. The autophagosome in the hippocampus was observed using transmission electron microscopy. Immunohistochemistry was performed to detect Aβ1-42 expression. LC3B and P62 expressions were evaluated by immunofluorescence. The expression levels of the lncRNAs Six3os1, miR-511-3p, and AKT3 were detected by qRT-PCR. The differential expression of PI-3K, AKT3, mTOR, LC3B-II/I, and P62 proteins in the hippocampus was detected by western blot. The dual-luciferase assay was undertaken to examine the targeting relationships of the lncRNAs Six3os1, miR-511-3p, and AKT3. RESULTS Compared with the control group, the AD model showed higher escape latency in the Morris Water Maze and reduced autophagic vacuoles in the cytoplasm of hippocampal neurons (both p < 0.01). Compared with the control group, the AD model showed higher expression of Aβ1-42, the lncRNAs Six3os1, PI-3K, mTOR, P62, and AKT3 protein (all p < 0.01); but lower mir-511-3p and LC3B (both p < 0.01). Compared with the AD model group, the moxibustion group had a shorter escape latency, more autophagic bubbles in the hippocampus, and lower expression of positive Aβ1-42, the lncRNAs Six3os1, PI-3K, mTOR, P62, and AKT3 protein (all p < 0.01). In contrast, the levels of miR-511-3p and LC3B proteins were considerably increased in the moxibustion group compared to the AD model group (both p < 0.01). Based on the dual-luciferase assay, there was a targeting link among the lncRNAs Six3os1, miR-511-3p, and AKT3. CONCLUSION Moxibustion at acupoints of the governor vessel can suppress the lncRNA Six3os1 expression, promote cell autophagy, accelerate Aβ1-42 clearance and alleviate cognitive dysfunction of AD mediated by the PI3K/AKT/mTOR signaling pathway through the lncRNA Six3os1/miR-511-3p/AKT3 axis.
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Li H, Li M, Chen K, Li Y, Yang Z, Zhou Z. The circadian clock gene ARNTL overexpression suppresses oral cancer progression by inducing apoptosis via activating autophagy. MEDICAL ONCOLOGY (NORTHWOOD, LONDON, ENGLAND) 2022; 39:244. [PMID: 36180647 DOI: 10.1007/s12032-022-01832-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 08/26/2022] [Indexed: 12/24/2022]
Abstract
The study aimed to explore tumor suppressor mechanism of ARNTL from the perspective of autophagy in oral cancer. Human oral squamous carcinoma HN6 cells stably overexpressing ARNTL were established, cell viability and apoptosis were detected by CCK-8 and TUNEL assays, and intracellular autophagosomes were observed under electron microscopy. Western Blot detected expressions of Beclin1, LC3 II/I, ATG-12, P62, BAX and BCL-2. Bafilomycin A1 was used to detect autophagic flux, and Western Blot was used to detect changes of LC3II and P62 proteins. Autophinib was added to cells with ARNTL overexpression for recovery experiments, and cell proliferation and apoptosis were detected by flow cytometry. In vivo tumorigenesis experiment was used to evaluate the in vivo anti-tumor efficacy of ARNTL, and Western blot simultaneously detected ARNTL, LC3 II/I, Beclin1, P62 and ATG-12 expressions. ARNTL overexpression promoted apoptosis and autophagy and inhibited cell viability. In ARNTL-overexpressing cells, expressions of Beclin1, LC3 II/I, and BAX were significantly up-regulated, while P62 and BCL-2 expressions were decreased, and ATG-12 expression wasn't significantly changed. When the autophagy inhibitor Autophinib was used, expressions of elevated BAX and decreased BCL-2 were reversed effectively, as were decreased cell proliferation index and increased apoptosis index. An in vivo tumorigenesis assay also showed ARNTL overexpression inhibited tumor growth, and autophagy-related protein expressions were consistent with the in vitro data. The research demonstrated for the first time that ARNTL induced apoptosis and inhibited cell proliferation dependent on autophagy in oral cancer, which provides theoretical basis for potential therapeutic targets.
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Affiliation(s)
- Hanxue Li
- Department of Preventive Dentistry, Stomatological Hospital of Chongqing Medical University, No. 5, Shangqingsi Road, Yuzhong District, Chongqing, 400015, China.,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Meng Li
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Kuichi Chen
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Yueheng Li
- Department of Preventive Dentistry, Stomatological Hospital of Chongqing Medical University, No. 5, Shangqingsi Road, Yuzhong District, Chongqing, 400015, China
| | - Zhengyan Yang
- Department of Preventive Dentistry, Stomatological Hospital of Chongqing Medical University, No. 5, Shangqingsi Road, Yuzhong District, Chongqing, 400015, China.
| | - Zhi Zhou
- Department of Preventive Dentistry, Stomatological Hospital of Chongqing Medical University, No. 5, Shangqingsi Road, Yuzhong District, Chongqing, 400015, China.
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Tong L, Gao S, Li W, Yang J, Wang P, Li W. TRPM2 mediates CaMKⅡ-Beclin-1 signaling in early cortical injury after induced subarachnoid hemorrhage in mice. J Chem Neuroanat 2022; 125:102144. [PMID: 35988814 DOI: 10.1016/j.jchemneu.2022.102144] [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: 04/28/2022] [Revised: 08/15/2022] [Accepted: 08/15/2022] [Indexed: 11/17/2022]
Abstract
BACKGROUND Though early brain injury (EBI) is the primary cause of poor outcomes among patients with subarachnoid hemorrhage (SAH), its exact molecular mechanisms remain unclear. Improved the understanding of how transient receptor potential melastatin-related 2 (TRPM2) is involved in SAH-induced EBI will help develop novel interventions. METHODS Wild type (WT) male C57BL/6J mice were subjected to SAH for 12 h, 24 h or 48 h, after which neurological scores and pathological changes in the hippocampus (CA3, DG, and CA1) and temporal base cortex were observed. Expressions of TRPM2, Ca2+/calmodulin (CaM)-dependent protein kinase Ⅱ (CaMKⅡ), and Beclin-1 in hippocampus (CA3, DG, and CA1) and temporal base cortex were compared across post-SAH timepoints. TRPM2-deficient (TRPM2-/-) male C57BL/6 J mice and a CaMKⅡ inhibitor (KN-93) were used to analyze the effects oTRPM2 on the CaMKⅡ-Beclin-1 signaling post SAH. RESULTS Neurological and temporal base cortex deterioration were more severe with increased time post-SAH induction, whereas hippocampal damage was not observed. Post-SAH, TRPM2-CaMKⅡ-Beclin-1 cascade was activated in the temporal base cortex, but not the hippocampus. Using TRPM2-/- mice and KN-93 administration, SAH-induced EBI was improved, and CaMKⅡ and Beclin-1 expressions in the temporal base cortex were significantly decreased compared with WT mice. TRPM2-/- mice also showed better neurological improvement compared with KN-93 treated mice. CONCLUSION TRPM2 mediates CaMKⅡ-Beclin-1 signaling that aggravates SAH-induced EBI in the temporal base cortex. TRPM2 may be an alternative therapy target in EBI after SAH. DATA AVAILABILITY The datasets generated and/or analysed during the current study are available from the corresponding author.
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Affiliation(s)
- Lin Tong
- Department of Neurology, Yantai Affiliated Hospital of Binzhou Medical University, 264000, China.
| | - Su Gao
- Department of Neurology, Yantai Affiliated Hospital of Binzhou Medical University, 264000, China
| | - Wei Li
- Department of Neurology, Yantai Affiliated Hospital of Binzhou Medical University, 264000, China
| | - Junli Yang
- Department of Neurology, Yantai Affiliated Hospital of Binzhou Medical University, 264000, China
| | - Ping Wang
- Department of Neurology, Yantai Affiliated Hospital of Binzhou Medical University, 264000, China
| | - Weiwei Li
- Department of Neurology, Yantai Affiliated Hospital of Binzhou Medical University, 264000, China
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Ubiquitin-specific peptidase 10 ameliorates hepatic steatosis in nonalcoholic steatohepatitis model by restoring autophagic activity. Dig Liver Dis 2022; 54:1021-1029. [PMID: 35288065 DOI: 10.1016/j.dld.2022.02.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 01/18/2022] [Accepted: 02/14/2022] [Indexed: 12/12/2022]
Abstract
BACKGROUND Nonalcoholic steatohepatitis (NASH) is a critical event in the progression of nonalcoholic fatty liver disease (NAFLD). Steatosis induces lipotoxicity, driving the transition of simple fatty liver (NAFL) to NASH. Autophagy affects NAFLD by improving steatosis. AIM To investigate whether ubiquitin-specific peptidase (USP)10 alleviates hepatic steatosis through autophagy. METHODS A methionine-choline-deficient diet (MCDD) and choline-deficient diet (CDD) were used to model rodent NASH and NAFL, respectively. HepG2 cells were treated with palmitic acid to model hepatocellular steatosis. A viral carrier was used to regulate the USP10 level. Real-time fluorescence quantitative polymerase chain reaction, western blotting, histology, and electron microscopy were used to detect autophagic activity and steatosis. RESULTS In vivo, a time-dependent correlation of USP10 and autophagic activity in the liver was found during NAFLD (including NAFL and NASH) modeling. After 8 weeks of modeling, the autophagic activity of NASH was lower than that of the healthy controls and those with NAFL. USP10 could promote autophagy-related pathways and molecules and increase the synthesis of autophagosomes in NASH, improving steatosis, inflammation, and fibrosis. In vitro, autophagy inhibitors reversed the lipid-lowering effect of USP10 without decreasing the level of fatty acid β-oxidation. CONCLUSION USP10 ameliorated histological steatosis, inflammation, and fibrosis. USP10 alleviated hepatic steatosis in NASH in an autophagy-dependent manner.
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Bioinformatics Analysis Reveals an Association between Autophagy, Prognosis, Tumor Microenvironment, and Immunotherapy in Osteosarcoma. JOURNAL OF ONCOLOGY 2022; 2022:4220331. [PMID: 35874628 PMCID: PMC9303156 DOI: 10.1155/2022/4220331] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/13/2022] [Accepted: 06/20/2022] [Indexed: 12/14/2022]
Abstract
Autophagy is a catabolic pathway involved in the regulation of bone homeostasis. We explore clinical correlation of autophagy-related key molecules to establish risk signature for predicting the prognosis, tumor microenvironment (TME), and immunotherapy response of osteosarcoma. Single cell RNA sequencing data from GSE162454 dataset distinguished malignant cells from normal cells in osteosarcoma. Autophagy-related genes (ARGs) were extracted from the established risk signature of the Molecular Signatures Database of Gene Set Enrichment Analysis (GSEA) by univariate Cox and least absolute shrinkage and selection operator (LASSO) Cox regression analysis. Overall survival (OS), TME score, abundance of infiltrating immune cells, and response to immune-checkpoint blockade (ICB) treatment in patients with different risks were compared based on risk score. Nine ARGs were identified and risk signature was constructed. In all osteosarcoma datasets, the OS was significantly longer in the high-risk patients than low-risk onset. Risk signature significantly stratified clinical outcomes, including OS, metastatic status, and survival status. Risk signature was an independent variable for predicting osteosarcoma OS and showed high accuracy. A nomogram based on risk signature and metastases was developed. The calibration curve confirmed the consistency in 1-year, 3-year, and 5-year predicted OS and the actual OS. The risk score was related to 6 kinds of T cells and macrophages, myeloid-derived suppressor cell, natural killer cell, immune score, and stromal score in TME. The risk signature helped in predicting patients' response to anti-PD1/anti-PD-L1 treatment. The ARGs-led risk signature has important value for survival prediction, risk stratification, tumor microenvironment, and immune response evaluation of osteosarcoma.
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Tao L, Liu X, Jiang X, Zhang K, Wang Y, Li X, Jiang S, Han T. USP10 as a Potential Therapeutic Target in Human Cancers. Genes (Basel) 2022; 13:genes13050831. [PMID: 35627217 PMCID: PMC9142050 DOI: 10.3390/genes13050831] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 04/28/2022] [Accepted: 05/04/2022] [Indexed: 12/04/2022] Open
Abstract
Deubiquitination is a major form of post-translational protein modification involved in the regulation of protein homeostasis and various cellular processes. Deubiquitinating enzymes (DUBs), comprising about five subfamily members, are key players in deubiquitination. USP10 is a USP-family DUB featuring the classic USP domain, which performs deubiquitination. Emerging evidence has demonstrated that USP10 is a double-edged sword in human cancers. However, the precise molecular mechanisms underlying its different effects in tumorigenesis remain elusive. A possible reason is dependence on the cell context. In this review, we summarize the downstream substrates and upstream regulators of USP10 as well as its dual role as an oncogene and tumor suppressor in various human cancers. Furthermore, we summarize multiple pharmacological USP10 inhibitors, including small-molecule inhibitors, such as spautin-1, and traditional Chinese medicines. Taken together, the development of specific and efficient USP10 inhibitors based on USP10’s oncogenic role and for different cancer types could be a promising therapeutic strategy.
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Affiliation(s)
- Li Tao
- The Affiliated Cancer Hospital of Zhengzhou University, Zhengzhou 450008, China;
| | - Xiao Liu
- School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang 453003, China; (X.L.); (X.J.); (K.Z.); (Y.W.)
| | - Xinya Jiang
- School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang 453003, China; (X.L.); (X.J.); (K.Z.); (Y.W.)
| | - Kun Zhang
- School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang 453003, China; (X.L.); (X.J.); (K.Z.); (Y.W.)
| | - Yijing Wang
- School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang 453003, China; (X.L.); (X.J.); (K.Z.); (Y.W.)
| | - Xiumin Li
- Henan Key Laboratory of Tumor Molecular Therapy Medicine, Xinxiang Medical University, Xinxiang 453003, China;
| | - Shulong Jiang
- Clinical Medical Laboratory Center, Jining First People’s Hospital, Jining Medical University, Jining 272000, China
- Correspondence: (S.J.); (T.H.)
| | - Tao Han
- School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang 453003, China; (X.L.); (X.J.); (K.Z.); (Y.W.)
- Henan Key Laboratory of Tumor Molecular Therapy Medicine, Xinxiang Medical University, Xinxiang 453003, China;
- Correspondence: (S.J.); (T.H.)
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Lu X, Zhang J, Li YQ, Liu QX, Zhou D, Deng XF, Qiu Y, Chen Q, Li MY, Liu XQ, Dai JG, Zheng H. Plasmodium Circumsporozoite Protein Enhances the Efficacy of Gefitinib in Lung Adenocarcinoma Cells by Inhibiting Autophagy via Proteasomal Degradation of LC3B. Front Cell Dev Biol 2022; 10:830046. [PMID: 35186935 PMCID: PMC8851824 DOI: 10.3389/fcell.2022.830046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 01/13/2022] [Indexed: 12/24/2022] Open
Abstract
Background: Almost all lung adenocarcinoma (LUAD) patients with EGFR mutant will develop resistance to EGFR-TKIs, which limit the long-term clinical application of these agents. Accumulating evidence shows one of the main reasons for resistance to EGFR-TKIs is induction of autophagy in tumor cells. Our previous study found that circumsporozoite protein (CSP) in Plasmodium can suppress autophagy in host hepatocytes. However, it is unknown whether CSP-mediated inhibition of autophagy could improve the anti-tumor effect of EGFR-TKIs. Methods: We constructed A549 and H1975 cell lines with stable overexpression of CSP (OE-CSP cells). CCK-8, Lactate Dehydrogenase (LDH), flow cytometry, and colony analysis were performed to observe the effect of CSP overexpression on cell viability, apoptosis rate, and colony formation ratio. The sensitizing effect of CSP on gefitinib was evaluated in vivo using a subcutaneous tumor model in nude mice and immunohistochemical assay. The role of CSP in regulation of autophagy was investigated by laser confocal microscopy assay and western blotting. A transcriptome sequencing assay and real-time polymerase chain reaction were used to determine the levels of mRNA for autophagy-related proteins. Cycloheximide (CHX), MG132, TAK-243, and immunoprecipitation assays were used to detect and confirm proteasomal degradation of LC3B. Results: OE-CSP A549 and H1975 cells were more sensitive to gefitinib, demonstrating significant amounts of apoptosis and decreased viability. In the OE-CSP group, autophagy was significantly inhibited, and there was a decrease in LC3B protein after exposure to gefitinib. Cell viability and colony formed ability were recovered when OE-CSP cells were exposed to rapamycin. In nude mice with xenografts of LUAD cells, inhibition of autophagy by CSP resulted in suppression of cell growth, and more marked apoptosis during exposure to gefitinib. CSP promoted ubiquitin-proteasome degradation of LC3B, leading to inhibition of autophagy in LUAD cells after treatment with gefitinib. When LUAD cells were treated with ubiquitin activating enzyme inhibitor TAK-243, cell viability, apoptosis, and growth were comparable between the OE-CSP group and a control group both in vivo and in vitro. Conclusion: CSP can inhibit gefitinib-induced autophagy via proteasomal degradation of LC3B, which suggests that CSP could be used as an autophagy inhibitor to sensitize EGFR-TKIs.
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Affiliation(s)
- Xiao Lu
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Jiao Zhang
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Yan-Qi Li
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Quan-Xing Liu
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Dong Zhou
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Xu-Feng Deng
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Yuan Qiu
- Department of General Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Qian Chen
- Cancer Center of Daping Hospital, Army Medical University, Chongqing, China
| | - Man-Yuan Li
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Xiao-Qing Liu
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Ji-Gang Dai
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Hong Zheng
- Department of Thoracic Surgery, Xinqiao Hospital, Army Medical University, Chongqing, China
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USP10 inhibits aberrant cytoplasmic aggregation of TDP-43 by promoting stress granule clearance. Mol Cell Biol 2022; 42:e0039321. [PMID: 35007165 DOI: 10.1128/mcb.00393-21] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
TDP-43 is a causative factor of amyotrophic lateral sclerosis (ALS). Cytoplasmic TDP-43 aggregates in neurons are a hallmark pathology of ALS. Under various stress conditions, TDP-43 localizes sequentially to two cytoplasmic protein aggregates: stress granules (SGs) first, and then aggresomes. Accumulating evidence suggests that delayed clearance of TDP-43-positive SGs is associated with pathological TDP-43 aggregates in ALS. We found that USP10 promotes the clearance of TDP-43-positive SGs in cells treated with proteasome inhibitor, thereby promoting the formation of TDP-43-positive aggresomes, and the depletion of USP10 increases the amount of insoluble TDP-35, a cleaved product of TDP-43, in the cytoplasm. TDP-35 interacted with USP10 in an RNA-binding dependent manner; however, impaired RNA-binding of TDP-35 reduced the localization in SGs and aggresomes and induced USP10-negative TDP-35 aggregates. Immunohistochemistry showed that most of the cytoplasmic TDP-43/TDP-35-aggregates in the neurons of ALS patients were USP10-negative. Our findings suggest that USP10 inhibits aberrant aggregation of TDP-43/TDP-35 in the cytoplasm of neuronal cells by promoting the clearance of TDP-43/TDP-35-positive SGs and facilitating the formation of TDP-43/TDP-35-positive aggresomes.
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Farina S, Esposito F, Battistoni M, Biamonti G, Francia S. Post-Translational Modifications Modulate Proteinopathies of TDP-43, FUS and hnRNP-A/B in Amyotrophic Lateral Sclerosis. Front Mol Biosci 2021; 8:693325. [PMID: 34291086 PMCID: PMC8287968 DOI: 10.3389/fmolb.2021.693325] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Accepted: 06/07/2021] [Indexed: 12/14/2022] Open
Abstract
It has been shown that protein low-sequence complexity domains (LCDs) induce liquid-liquid phase separation (LLPS), which is responsible for the formation of membrane-less organelles including P-granules, stress granules and Cajal bodies. Proteins harbouring LCDs are widely represented among RNA binding proteins often mutated in ALS. Indeed, LCDs predispose proteins to a prion-like behaviour due to their tendency to form amyloid-like structures typical of proteinopathies. Protein post-translational modifications (PTMs) can influence phase transition through two main events: i) destabilizing or augmenting multivalent interactions between phase-separating macromolecules; ii) recruiting or excluding other proteins and/or nucleic acids into/from the condensate. In this manuscript we summarize the existing evidence describing how PTM can modulate LLPS thus favouring or counteracting proteinopathies at the base of neurodegeneration in ALS.
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Affiliation(s)
- Stefania Farina
- Istituto di Genetica Molecolare "Luigi Luca Cavalli-Sforza" - Consiglio Nazionale delle Ricerce (CNR), Pavia, Italy.,University School for Advanced Studies IUSS, Pavia, Italy
| | - Francesca Esposito
- Istituto di Genetica Molecolare "Luigi Luca Cavalli-Sforza" - Consiglio Nazionale delle Ricerce (CNR), Pavia, Italy.,Università Degli Studi di Pavia, Pavia, Italy
| | | | - Giuseppe Biamonti
- Istituto di Genetica Molecolare "Luigi Luca Cavalli-Sforza" - Consiglio Nazionale delle Ricerce (CNR), Pavia, Italy
| | - Sofia Francia
- Istituto di Genetica Molecolare "Luigi Luca Cavalli-Sforza" - Consiglio Nazionale delle Ricerce (CNR), Pavia, Italy
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