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Chen Y, Zhang H, Jiang L, Cai W, Kuang J, Geng Y, Xu H, Li Y, Yang L, Cai Y, Wang X, Xiao J, Ni W, Zhou K. DADLE promotes motor function recovery by inhibiting cytosolic phospholipase A 2 mediated lysosomal membrane permeabilization after spinal cord injury. Br J Pharmacol 2024; 181:712-734. [PMID: 37766498 DOI: 10.1111/bph.16255] [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: 05/15/2023] [Revised: 09/15/2023] [Accepted: 09/21/2023] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND AND PURPOSE Autophagy is a protective factor for controlling neuronal damage, while necroptosis promotes neuroinflammation after spinal cord injury (SCI). DADLE (D-Ala2 , D-Leu5 ]-enkephalin) is a selective agonist for delta (δ) opioid receptor and has been identified as a promising drug for neuroprotection. The aim of this study was to investigate the mechanism/s by which DADLE causes locomotor recovery following SCI. EXPERIMENTAL APPROACH Spinal cord contusion model was used and DADLE was given by i.p. (16 mg·kg-1 ) in mice for following experiments. Motor function was assessed by footprint and Basso mouse scale (BMS) score analysis. Western blotting used to evaluate related protein expression. Immunofluorescence showed the protein expression in each cell and its distribution. Network pharmacology analysis was used to find the related signalling pathways. KEY RESULTS DADLE promoted functional recovery after SCI. In SCI model of mice, DADLE significantly increased autophagic flux and inhibited necroptosis. Concurrently, DADLE restored autophagic flux by decreasing lysosomal membrane permeabilization (LMP). Additionally, chloroquine administration reversed the protective effect of DADLE to inhibit necroptosis. Further analysis showed that DADLE decreased phosphorylated cPLA2 , overexpression of cPLA2 partially reversed DADLE inhibitory effect on LMP and necroptosis, as well as the promotion autophagy. Finally, AMPK/SIRT1/p38 pathway regulating cPLA2 is involved in the action DADLE on SCI and naltrindole inhibited DADLE action on δ receptor and on AMPK signalling pathway. CONCLUSION AND IMPLICATION DADLE causes its neuroprotective effects on SCI by promoting autophagic flux and inhibiting necroptosis by decreasing LMP via activating δ receptor/AMPK/SIRT1/p38/cPLA2 pathway.
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Affiliation(s)
- Yituo Chen
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou, China
| | - Haojie Zhang
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou, China
| | - Liting Jiang
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou, China
| | - Wanta Cai
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou, China
| | - Jiaxuan Kuang
- Cixi Biomedical Research Institute, Wenzhou Medical University, Ningbo, China
| | - Yibo Geng
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou, China
| | - Hui Xu
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou, China
| | - Yao Li
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou, China
| | - Liangliang Yang
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Yuepiao Cai
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Xiangyang Wang
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou, China
| | - Jian Xiao
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Wenfei Ni
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou, China
| | - Kailiang Zhou
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
- Zhejiang Provincial Key Laboratory of Orthopaedics, Wenzhou, China
- The Second Clinical Medical College of Wenzhou Medical University, Wenzhou, China
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Sun T, Huang K, Niu K, Lin C, Liu W, Yeh C, Kuo S, Chang C. Hyperbaric oxygen therapy suppresses hypoxia and reoxygenation injury to retinal pigment epithelial cells through activating peroxisome proliferator activator receptor-alpha signalling. J Cell Mol Med 2023; 27:3189-3201. [PMID: 37731202 PMCID: PMC10568664 DOI: 10.1111/jcmm.17963] [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: 02/08/2023] [Revised: 09/07/2023] [Accepted: 09/11/2023] [Indexed: 09/22/2023] Open
Abstract
Retinal ischemia followed by reperfusion (IR) is a common cause of many ocular disorders, such as age-related macular degeneration (AMD), which leads to blindness in the elderly population, and proper therapies remain unavailable. Retinal pigment epithelial (RPE) cell death is a hallmark of AMD. Hyperbaric oxygen (HBO) therapy can improve IR tissue survival by inducing ischemic preconditioning responses. We conducted an in vitro study to examine the effects of HBO preconditioning on oxygen-glucose deprivation (OGD)-induced IR-injured RPE cells. RPE cells were treated with HBO (100% O2 at 3 atmospheres absolute for 90 min) once a day for three consecutive days before retinal IR onset. Compared with normal cells, the IR-injured RPE cells had lower cell viability, lower peroxisome proliferator activator receptor-alpha (PPAR-α) expression, more severe oxidation status, higher blood-retinal barrier disruption and more elevated apoptosis and autophagy rates. HBO preconditioning increased PPAR-α expression, improved cell viability, decreased oxidative stress, blood-retinal barrier disruption and cellular apoptosis and autophagy. A specific PPAR-α antagonist, GW6471, antagonized all the protective effects of HBO preconditioning in IR-injured RPE cells. Combining these observations, HBO therapy can reverse OGD-induced RPE cell injury by activating PPAR-α signalling.
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Affiliation(s)
- Tzong‐Bor Sun
- Department of Hyperbaric Oxygen MedicineChi Mei Medical CenterTainanTaiwan
- Division of Plastic Surgery, Department of SurgeryChi Mei Medical CenterTainanTaiwan
- Department of Biotechnology and Food TechnologySouthern Taiwan University of Science and TechnologyTainanTaiwan
| | - Kuo‐Feng Huang
- Division of Plastic Surgery, Department of SurgeryChi Mei Medical CenterTainanTaiwan
| | - Ko‐Chi Niu
- Department of Hyperbaric Oxygen MedicineChi Mei Medical CenterTainanTaiwan
| | - Cheng‐Hsien Lin
- Department of MedicineMackay Medical CollegeNew Taipei CityTaiwan
- Department of Medical ResearchChi Mei Medical CenterTainanTaiwan
| | - Wen‐Pin Liu
- Department of Medical ResearchChi Mei Medical CenterTainanTaiwan
| | - Chao‐Hung Yeh
- Division of Neurosurgery, Department of SurgeryChi Mei Medical CenterTainanTaiwan
- Department of OptometryChung Hwa University of Medical TechnologyTainanTaiwan
| | - Shu‐Chun Kuo
- Department of OptometryChung Hwa University of Medical TechnologyTainanTaiwan
- Department of OphthalmologyChi Mei Medical CenterTainanTaiwan
| | - Ching‐Ping Chang
- Department of Medical ResearchChi Mei Medical CenterTainanTaiwan
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