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Chen J, Bian X, Li Y, Xiao X, Yin Y, Du X, Wang C, Li L, Bai Y, Liu X. Moderate hypothermia induces protection against hypoxia/reoxygenation injury by enhancing SUMOylation in cardiomyocytes. Mol Med Rep 2020; 22:2617-2626. [PMID: 32945433 PMCID: PMC7453665 DOI: 10.3892/mmr.2020.11374] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Accepted: 03/04/2020] [Indexed: 02/05/2023] Open
Abstract
Moderate hypothermia plays a major role in myocardial cell death as a result of hypoxia/reoxygenation (H/R) injury. However, few studies have investigated the molecular mechanisms of hypothermic cardioprotection. Several responses to stress and other cell functions are regulated by post‑translational protein modifications controlled by small ubiquitin‑like modifier (SUMO). Previous studies have established that high SUMOylation of proteins potentiates the ability of cells to withstand hypoxic‑ischemic stress. The level to which moderate hypothermia affects SUMOylation is not fully understood, as the functions of SUMOylation in the heart have not been studied in depth. The aim of the present study was to investigate the effect of moderate hypothermia (33˚C) on the protective functions of SUMOylation on myocardial cells. HL‑1 and H9c2 cells were treated with the hypoxia‑mimetic chemical CoCl2 and complete medium to simulate H/R injury. Hypothermia intervention was then administered. A Cell Counting kit‑8 assay was used to analyze cell viability. Mitochondrial membrane potential and the generation of reactive oxygen species (ROS) were used as functional indexes of mitochondria dysfunction. Bcl‑2 and caspase‑3 expression levels were analyzed by western blotting. The present results suggested that moderate hypothermia significantly increased SUMO1 and Bcl‑2 expression levels, as well as the mitochondrial membrane potential, but significantly decreased the expression levels of caspase‑3 and mitochondrial ROS. Thus, moderate hypothermia may enhance SUMOylation and attenuate myocardial H/R injury. Moreover, a combination of SUMOylation and moderate hypothermia may be a potential cardiovascular intervention.
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Affiliation(s)
- Jinsheng Chen
- North China University of Science and Technology, Tangshan, Hebei 063210, P.R. China
- Department of Anesthesiology, Tangshan Maternity and Child Health Care Hospital, Tangshan, Hebei 063000, P.R. China
| | - Xiyun Bian
- Central Laboratory, The Fifth Central Hospital of Tianjin, Tianjin 300450, P.R. China
| | - Yanxia Li
- Central Laboratory, The Fifth Central Hospital of Tianjin, Tianjin 300450, P.R. China
| | - Xiaolin Xiao
- Central Laboratory, The Fifth Central Hospital of Tianjin, Tianjin 300450, P.R. China
| | - Yanying Yin
- Department of Neurology, The Fifth Central Hospital of Tianjin, Tianjin 300450, P.R. China
| | - Xinping Du
- Department of Cardiology, The Fifth Central Hospital of Tianjin, Tianjin 300450, P.R. China
| | - Cuancuan Wang
- Department of Cardiology, The Fifth Central Hospital of Tianjin, Tianjin 300450, P.R. China
| | - Lili Li
- Department of Bone and Soft Tissue Tumors, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, P.R. China
| | - Yaowu Bai
- North China University of Science and Technology, Tangshan, Hebei 063210, P.R. China
- Department of Anesthesiology, Tangshan Maternity and Child Health Care Hospital, Tangshan, Hebei 063000, P.R. China
| | - Xiaozhi Liu
- Central Laboratory, The Fifth Central Hospital of Tianjin, Tianjin 300450, P.R. China
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Dexamethasone Upregulates the Expression of Aquaporin4 by Increasing SUMOylation in A549 Cells. Inflammation 2020; 43:1925-1935. [PMID: 32495129 DOI: 10.1007/s10753-020-01267-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Dexamethasone can alleviate the severity of bronchial and alveolar edema and therefore is widely applied in the treatment of various exudative diseases including pulmonary edema. However, the effectiveness of dexamethasone is still being questioned and its mechanism is not fully understood. Aquaporins (AQPs) are mainly responsible for the transmembrane transport of water, which is tightly associated with pulmonary edema. Small ubiquitin-like modifiers (SUMOs) are considered to play a protective role in some pathological conditions. In this study, we demonstrated that dexamethasone can upregulate the expression of AQPs in A549 cells by inducing SUMOylation. We found that a low dose of dexamethasone significantly upregulated the levels of SUMOylation and AQP expression in A549 cells, accompanied by a translocation of SUMOs from the cytoplasm to the nucleus. We also explored the possible relation between SUMOylation and AQPs. Knockdown of SUMO2/3 by RNA interference decreased the level of AQP4 in A549 cells after dexamethasone stimulation. Together, our findings demonstrated that AQP4 expression was upregulated in A549 cells exposed to dexamethasone, and SUMOylation may participate in the regulation of AQP4.
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The Role of Ubiquitin-Proteasome Pathway and Autophagy-Lysosome Pathway in Cerebral Ischemia. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:5457049. [PMID: 32089771 PMCID: PMC7016479 DOI: 10.1155/2020/5457049] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 12/24/2019] [Accepted: 01/20/2020] [Indexed: 12/12/2022]
Abstract
The ubiquitin-proteasome pathway and autophagy-lysosome pathway are two major routes for clearance of aberrant cellular components to maintain protein homeostasis and normal cellular functions. Accumulating evidence shows that these two pathways are impaired during cerebral ischemia, which contributes to ischemic-induced neuronal necrosis and apoptosis. This review aims to critically discuss current knowledge and controversies on these two pathways in response to cerebral ischemic stress. We also discuss molecular mechanisms underlying the impairments of these protein degradation pathways and how such impairments lead to neuronal damage after cerebral ischemia. Further, we review the recent advance on the understanding of the involvement of these two pathways in the pathological process during many therapeutic approaches against cerebral ischemia. Despite recent advances, the exact role and molecular mechanisms of these two pathways following cerebral ischemia are complex and not completely understood, of which better understanding will provide avenues to develop novel therapeutic strategies for ischemic stroke.
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