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Camargo LL, Rios FJ, Montezano AC, Touyz RM. Reactive oxygen species in hypertension. Nat Rev Cardiol 2024:10.1038/s41569-024-01062-6. [PMID: 39048744 DOI: 10.1038/s41569-024-01062-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/26/2024] [Indexed: 07/27/2024]
Abstract
Hypertension is a leading risk factor for stroke, heart disease and chronic kidney disease. Multiple interacting factors and organ systems increase blood pressure and cause target-organ damage. Among the many molecular elements involved in the development of hypertension are reactive oxygen species (ROS), which influence cellular processes in systems that contribute to blood pressure elevation (such as the cardiovascular, renal, immune and central nervous systems, or the renin-angiotensin-aldosterone system). Dysregulated ROS production (oxidative stress) is a hallmark of hypertension in humans and experimental models. Of the many ROS-generating enzymes, NADPH oxidases are the most important in the development of hypertension. At the cellular level, ROS influence signalling pathways that define cell fate and function. Oxidative stress promotes aberrant redox signalling and cell injury, causing endothelial dysfunction, vascular damage, cardiovascular remodelling, inflammation and renal injury, which are all important in both the causes and consequences of hypertension. ROS scavengers reduce blood pressure in almost all experimental models of hypertension; however, clinical trials of antioxidants have yielded mixed results. In this Review, we highlight the latest advances in the understanding of the role and the clinical implications of ROS in hypertension. We focus on cellular sources of ROS, molecular mechanisms of oxidative stress and alterations in redox signalling in organ systems, and their contributions to hypertension.
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Affiliation(s)
- Livia L Camargo
- Research Institute of the McGill University Health Centre (RI-MUHC), Montreal, Quebec, Canada.
| | - Francisco J Rios
- Research Institute of the McGill University Health Centre (RI-MUHC), Montreal, Quebec, Canada
| | - Augusto C Montezano
- Research Institute of the McGill University Health Centre (RI-MUHC), Montreal, Quebec, Canada
| | - Rhian M Touyz
- Research Institute of the McGill University Health Centre (RI-MUHC), Montreal, Quebec, Canada.
- Department of Medicine, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada.
- Department of Family Medicine, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada.
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Zhu X, Chu X, Wang H, Liao Z, Xiang H, Zhao W, Yang L, Wu P, Liu X, Chen D, Xie J, Dai W, Li L, Wang J, Zhao H. Investigating neuropathological changes and underlying neurobiological mechanisms in the early stages of primary blast-induced traumatic brain injury: Insights from a rat model. Exp Neurol 2024; 375:114731. [PMID: 38373483 DOI: 10.1016/j.expneurol.2024.114731] [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: 10/29/2023] [Revised: 02/06/2024] [Accepted: 02/14/2024] [Indexed: 02/21/2024]
Abstract
The utilization of explosives and chemicals has resulted in a rise in blast-induced traumatic brain injury (bTBI) in recent times. However, there is a dearth of diagnostic biomarkers and therapeutic targets for bTBI due to a limited understanding of biological mechanisms, particularly in the early stages. The objective of this study was to examine the early neuropathological characteristics and underlying biological mechanisms of primary bTBI. A total of 83 Sprague Dawley rats were employed, with their heads subjected to a blast shockwave of peak overpressure ranging from 172 to 421 kPa in the GI, GII, and GIII groups within a closed shock tube, while the body was shielded. Neuromotor dysfunctions, morphological changes, and neuropathological alterations were detected through modified neurologic severity scores, brain water content analysis, MRI scans, histological, TUNEL, and caspase-3 immunohistochemical staining. In addition, label-free quantitative (LFQ)-proteomics was utilized to investigate the biological mechanisms associated with the observed neuropathology. Notably, no evident damage was discernible in the GII and GI groups, whereas mild brain injury was observed in the GIII group. Neuropathological features of bTBI were characterized by morphologic changes, including neuronal injury and apoptosis, cerebral edema, and cerebrovascular injury in the shockwave's path. Subsequently, 3153 proteins were identified and quantified in the GIII group, with subsequent enriched neurological responses consistent with pathological findings. Further analysis revealed that signaling pathways such as relaxin signaling, hippo signaling, gap junction, chemokine signaling, and sphingolipid signaling, as well as hub proteins including Prkacb, Adcy5, and various G-protein subunits (Gnai2, Gnai3, Gnao1, Gnb1, Gnb2, Gnb4, and Gnb5), were closely associated with the observed neuropathology. The expression of hub proteins was confirmed via Western blotting. Accordingly, this study proposes signaling pathways and key proteins that exhibit sensitivity to brain injury and are correlated with the early pathologies of bTBI. Furthermore, it highlights the significance of G-protein subunits in bTBI pathophysiology, thereby establishing a theoretical foundation for early diagnosis and treatment strategies for primary bTBI.
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Affiliation(s)
- Xiyan Zhu
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China
| | - Xiang Chu
- Cognitive Development and Learning and Memory Disorders Translational Medicine Laboratory, Children's Hospital, Chongqing Medical University, Chongqing, China; Emergency department, Daping Hospital, Army Medical University, Chongqing, China
| | - Hao Wang
- Neurosurgery department, Daping Hospital, Army Medical University, Chongqing, China
| | - Zhikang Liao
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China
| | - Hongyi Xiang
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China
| | - Wenbing Zhao
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China
| | - Li Yang
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China
| | - Pengfei Wu
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China
| | - Xing Liu
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China
| | - Diyou Chen
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China
| | - Jingru Xie
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China
| | - Wei Dai
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China
| | - Lei Li
- Trauma Medical Center, Daping Hospital, Army Medical University, Chongqing, China
| | - Jianmin Wang
- Department of Weapon Bioeffect Assessment, Daping Hospital, Army Medical University, Chongqing, China.
| | - Hui Zhao
- Department of Military Traffic Injury Prevention and Control, Daping Hospital, Army Medical University, Chongqing, China.
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