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Huang F, Deng Z, Zhang Q, Zhang Z, Li X, Zeng W, Wang Y, Hei Z, Yuan D. Dual-regulation by Cx32 in hepatocyte to trigger and worsen liver graft injury. Transl Res 2023; 262:44-59. [PMID: 37507007 DOI: 10.1016/j.trsl.2023.07.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 06/28/2023] [Accepted: 07/23/2023] [Indexed: 07/30/2023]
Abstract
Liver transplantation is the ultimate treatment option for end-stage liver failure. However, liver graft injury remains a challenge. This study aimed to investigate the role of connexin32 (Cx32) in liver graft injury and elucidate its mechanism of action. Through detecting liver graft samples from 6 patients, we observed that changes in the Cx32 level coincided with liver graft injury. Therefore, we established autologous orthotopic liver transplantation (AOLT) models using Cx32-knockout and wild-type mice and hypoxia/reoxygenation (H/R) and lipopolysaccharide (LPS) pretreatment models using alpha mouse liver 12 (AML12) cells, to explore Cx32 mechanisms in liver graft injury. Following in vivo and in vitro Cx32 knockout, oxidative stress and inflammatory response were inhibited through the regulation of PKC-α/NF-κB/NLRP3 and Nrf2/NOX4/ROS signaling pathways, thereby reducing Bak/Bax-related apoptosis and ameliorating liver graft injury. When the Cx32-based gap junction (GJ) was blocked with 2-aminoethoxydiphenyl borate (2-APB), ROS transfer was attenuated between neighboring cells, exacerbated oxidative stress and inflammatory response were prevented, and aggravation of liver graft injury was mitigated. These results highlight the dual regulation mechanism of Cx32 in liver graft injury. Through interaction with PKC-α, Cx32 regulated the NF-κB/NLRP3 and Nrf2/NOX4/ROS signaling pathways, thus directly triggering oxidative stress and inflammatory response. Simultaneously, mass-produced ROS were transferred to neighboring cells through Cx32 channels, for which oxidative stress and the inflammatory response were aggravated indirectly. Finally, Bak/Bax-related apoptosis was activated, thereby worsening liver graft injury. Our findings propose Cx32 as a dual mechanistic factor for oxidative stress and inflammatory signaling pathways in regulating cell apoptosis on liver graft injury, which suggests a promising therapeutic targets for liver graft injury.
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Affiliation(s)
- Fei Huang
- Department of Anesthesiology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P. R. China
| | - Zhizhao Deng
- Department of Anesthesiology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P. R. China
| | - Qian Zhang
- Department of Anesthesiology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P. R. China
| | - Zheng Zhang
- Department of Anesthesiology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P. R. China
| | - Xianlong Li
- Department of Anesthesiology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P. R. China
| | - Weiqi Zeng
- Department of Anesthesiology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P. R. China
| | - Yanling Wang
- Department of Anesthesiology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P. R. China.
| | - Ziqing Hei
- Department of Anesthesiology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P. R. China.
| | - Dongdong Yuan
- Department of Anesthesiology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, P. R. China.
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Dery KJ, Kupiec-Weglinski JW. New insights into ischemia-reperfusion injury signaling pathways in organ transplantation. Curr Opin Organ Transplant 2022; 27:424-433. [PMID: 35857344 DOI: 10.1097/mot.0000000000001005] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
PURPOSE OF REVIEW Ischemia-reperfusion injury (IRI) leading to allograft rejection in solid organ transplant recipients is a devastating event that compromises graft and patient survival. As our clinical knowledge regarding its definition and presentation has significantly improved over the last years, adequate biomarkers translating to important therapeutic intervention remains a challenge. This review will summarize recent findings in this area. RECENT FINDINGS In the past 18 months, our understanding of organ transplantation IRI has improved. IRI involves a positive amplification feedback loop encompassing damaged cells at the graft site, the activity of redox-sensitive damage-associated molecular patterns, and local sequestration of recipient-derived monocytes, lymphocytes and polymorphonuclear leukocytes, like neutrophils, to sustain the immunological cascade and to enhance the destruction of the foreign tissue. Recent studies have identified critical components leading to IRI, including the oxidation state of high mobility group box 1, a classic danger signal, its role in the Toll-like receptor 4-interleukin (IL)-23-IL-17A signaling axis, and the role of neutrophils and CD321, a marker for transmigration of circulating leukocytes into the inflamed tissue. In addition, recent findings imply that the protective functions mediated by autophagy activation counterbalance the detrimental nucleotide-binding domain-like receptor family, pyrin domain containing 3 inflammasome pathway. Finally, clinical studies reveal the posttransplant variables associated with early allograft dysfunction and IRI. SUMMARY The future challenge will be understanding how crosstalk at the molecular and cellular levels integrate prospectively to predict which peri-transplant signals are essential for long-term clinical outcomes.
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Affiliation(s)
- Kenneth J Dery
- The Dumont-UCLA Transplantation Center, Department of Surgery, Division of Liver and Pancreas Transplantation, David Geffen School of Medicine at UCLA, Los Angeles, California, USA
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Lin G, Long R, Yang X, Mao S, Li H. Etomidate Alleviates Ischemia-Anoxia Reperfusion Injury in Intestinal Epithelial Cells by Inhibiting the Activation of traf6-Regulated NF-KB Signaling. J BIOMATER TISS ENG 2022. [DOI: 10.1166/jbt.2022.2990] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Objective: The present study aimed to investigate the role of etomidate in intestinal cell ischemia and hypoxia-reperfusion injury and potential mechanisms. Method: In this study, we establish the intestinal epithelial cells ischemia-reperfusion model in vitro.
CCK8 was used to detect cell viability and flow cytometry assay was used to detect apoptosis levels of treated OGD/R model cells. ELISA measured the expression level of oxidative stress factors and inflammatory factors. Furthermore, western blot assay was used to detect the expression the
apoptosis-related factors and TNFR-associated factors in treated OGD/R model cells. Result: Etomidate does not affect the activity of intestinal epithelial cells, and can protect intestinal epithelial cells to reduce ischemiareperfusion injury, and the expression of inflammatory factors
and oxidative stress in cells with mild intestinal epithelial ischemia-reperfusion injury. Etomidate alleviates apoptosis of intestinal epithelial ischemia-reperfusion injury cells. Etomidate inhibits the activation of traf6-mediated NF-κB signal during ischemia-anoxia reperfusion
of intestinal epithelial cells. Conclusion: Taken together, our study demonstrated that etomidate attenuates inflammatory response and apoptosis in intestinal epithelial cells during ischemic hypoxia-reperfusion injury and inhibits activation of NF-κB signaling regulated
by TRAF6.
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Affiliation(s)
- Gen Lin
- Department of Anesthesiology, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangdong, 510080, China
| | - Ruichun Long
- Department of Anesthesiology, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangdong, 510080, China
| | - Xiaoqing Yang
- Department of Anesthesiology, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangdong, 510080, China
| | - Songsong Mao
- Department of Anesthesiology, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangdong, 510080, China
| | - Hongying Li
- Department of Anesthesiology, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangdong, 510080, China
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The Role of Endoplasmic Reticulum Stress and NLRP3 Inflammasome in Liver Disorders. Int J Mol Sci 2022; 23:ijms23073528. [PMID: 35408890 PMCID: PMC8998408 DOI: 10.3390/ijms23073528] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 03/21/2022] [Accepted: 03/23/2022] [Indexed: 12/12/2022] Open
Abstract
The endoplasmic reticulum (ER) is a key organelle responsible for the synthesis, modification, folding and assembly of proteins; calcium storage; and lipid synthesis. When ER homeostatic balance is disrupted by a variety of physiological and pathological factors—such as glucose deficiency, environmental toxins, Ca2+ level changes, etc.—ER stress can be induced. Abnormal ER stress can be involved in many diseases. NOD-like receptor family pyrin domain-containing 3 (NLRP3), an intracellular receptor, can perceive internal and external stimuli. It binds to apoptosis-associated speck-like protein containing a CARD (ASC) and caspase-1 to assemble into a protein complex called the NLRP3 inflammasome. Evidence indicates that ER stress and the NLRP3 inflammasome participate in many pathological processes; however, the exact mechanism remains to be understood. In this review, we summarized the role of ER stress and the NLRP3 inflammasome in liver disorders and analyzed the mechanisms, to provide references for future related research.
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Platt E, Klootwijk E, Salama A, Davidson B, Robertson F. Literature review of the mechanisms of acute kidney injury secondary to acute liver injury. World J Nephrol 2022; 11:13-29. [PMID: 35117976 PMCID: PMC8790308 DOI: 10.5527/wjn.v11.i1.13] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 05/12/2021] [Accepted: 12/25/2021] [Indexed: 02/06/2023] Open
Abstract
People exposed to liver ischaemia reperfusion (IR) injury often develop acute kidney injury and the combination is associated with significant morbidity and mortality. Molecular mediators released by the liver in response to IR injury are the likely cause of acute kidney injury (AKI) in this setting, but the mediators have not yet been identified. Identifying the mechanism of injury will allow the identification of therapeutic targets which may modulate both liver IR injury and AKI following liver IR injury.
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Affiliation(s)
- Esther Platt
- Division of Surgery and Interventional Science, University College London, London NW3 2QG, United Kingdom
| | - Enriko Klootwijk
- Department of Renal Medicine, University College London, London NW3 2PF, United Kingdom
| | - Alan Salama
- Department of Renal Medicine, University College London, London NW3 2PF, United Kingdom
| | - Brian Davidson
- Division of Surgery and Interventional Science, University College London, London NW3 2QG, United Kingdom
| | - Francis Robertson
- Division of Surgery and Interventional Science, University College London, London NW3 2QG, United Kingdom
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Wang W, Wang Y, Yang J. Protective effects of ischemic postconditioning on skeletal muscle following crush syndrome in the rat. Acta Cir Bras 2021; 36:e360701. [PMID: 34495138 PMCID: PMC8428673 DOI: 10.1590/acb360701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 06/03/2021] [Indexed: 11/29/2022] Open
Abstract
Purpose To investigate the effect of ischemic postconditioning (IPostC) on skeletal
muscle and its optimal protocol. Methods This article is about an animal study of rat model of crush syndrome. Sixty
rats were randomized into nine different IPostC intervention groups and a
control group. The anesthetized rats were subjected to unilateral hindlimb
3-kg compression with a compression device for 6 h, followed by nine
different IPostC intervention protocols. Results Serum levels of creatine kinase (CK) at 3 h post-crush became 2.3-3.9 times
among all 10 groups after crush. At 72 h post-crush, serum CK level was
reduced to 0.28-0.53 time in all intervention groups. The creatinine (CREA)
level in the control group was elevated to 3.11 times at 3 h post-crush and
reduced to1.77 time at 72 h post-crush. The potassium (K+) level in the
control group was elevated to 1.65 and 1.41 time at 3 and 72 h post-crush,
respectively. Conclusions Our IPostC intervention protocols can effectively protect rats from
crush-induced elevation of serum CK, CREA, and K+ levels. The timing of
IPostC intervention should be as early as possible, to ensure the protective
effect.
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Affiliation(s)
- Wei Wang
- First Medical Center of PLA General Hospital, China
| | - Yuan Wang
- First Medical Center of PLA General Hospital, China
| | - Jing Yang
- First Medical Center of PLA General Hospital, China
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Sun Q, Zhang Y, Wang S, Yang F, Cai H, Xing Y, Chen Z, Chen J. NEAT1 Decreasing Suppresses Parkinson's Disease Progression via Acting as miR-1301-3p Sponge. J Mol Neurosci 2021; 71:369-378. [PMID: 32712773 DOI: 10.1007/s12031-020-01660-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Accepted: 07/06/2020] [Indexed: 02/07/2023]
Abstract
Long non-coding RNA (lncRNA) plays a crucial role in multiple disorders, while the role of it in Parkinson's disease (PD) is still unclear. Here, the increased lncRNA NEAT1 was discovered in MPP+-induced SH-SY5Y cells. Then, we proved that NEAT1 decreasing suppressed MPP+-induced neuronal apoptosis, upregulation of α-syn and activation of NLRP3 inflammasome. Rescue experiments shown that the inhibition of NEAT1 decreasing to MPP+-induced activation of NLRP3 inflammasome and subsequent neuronal apoptosis can be reversed by overexpressed α-syn. Subsequently, we indicated the interaction between NEAT1 and miR-1301-3p, as well as between NEAT1 and miR-5047. Interesting, we found that NEAT1 decreasing repressed the expression of GJB1, a downstream target of miR-1301-3p and miR-5047, through promoting miR-1301-3p rather than miR-5047 expression. Finally, we transfected miR-1301-3p inhibitor to MPP+-induced SH-SY5Y cells following si-NEAT1, and found that downregulation of NEAT1 repressed α-syn-mediated the activation of NLRP3 inflammasome through regulating miR-1301-3p/GJB1 signaling pathway. Overall, our data demonstrated that NEAT1 decreasing effectively suppressed MPP+-induced neuronal apoptosis. Mechanismly, downregulation of NEAT1 repressed α-syn-induced activation of NLRP3 inflammasome via inhibiting the expression of GJB1 by targeting miR-1301-3p. Our study supported a new and reliable evidence for lncRNA NEAT1 as a potential target for PD treatment.
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Affiliation(s)
- Qiang Sun
- Department of Neurology, TaiHe Hospital, Hubei University of Medicine, No. 32 Renmin South Road, Shiyan, 442000, Hubei Province, China
| | - Yueliang Zhang
- Department of Neurology, TaiHe Hospital, Hubei University of Medicine, No. 32 Renmin South Road, Shiyan, 442000, Hubei Province, China
| | - Songlin Wang
- Department of Neurology, TaiHe Hospital, Hubei University of Medicine, No. 32 Renmin South Road, Shiyan, 442000, Hubei Province, China
| | - Fang Yang
- Department of Oncology, TaiHe Hospital, Hubei University of Medicine, No. 32 Renmin South Road, Shiyan, 442000, Hubei, China
| | - Hongxia Cai
- Department of Obstetrics and Gynecology, TaiHe Hospital, Hubei University of Medicine, No. 32 Renmin South Road, Shiyan, 442000, Hubei, China
| | - Yu Xing
- Department of Medical Image Center, TaiHe Hospital, Hubei University of Medicine, No. 32 Renmin South Road, Shiyan, 442000, Hubei, China
| | - Zengfeng Chen
- Chronic Disease Rehabilitation Centre 1, TaiHe Hospital, Hubei University of Medicine, No. 32 Renmin South Road, Shiyan, 442000, Hubei, China
| | - Jun Chen
- Department of Neurology, TaiHe Hospital, Hubei University of Medicine, No. 32 Renmin South Road, Shiyan, 442000, Hubei Province, China.
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