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Role of Remote Ischemic Preconditioning in Hepatic Ischemic Reperfusion Injury
Eun Kyung Choi1, Hoon Jung2, Sungmin Jeon1
1Department of Anesthesiology and Pain Medicine, Yeungnam University College of Medicine, Daegu, Republic of Korea.
Dose-Response : a Publication of International Hormesis Society
|August 28, 2020
Summary
Remote ischemic preconditioning (RIPC) reduces liver injury by decreasing oxidative stress, not inflammation. This protective effect is mediated by nitric oxide (NO) activation and antioxidant properties, offering potential therapeutic benefits.
Area of Science:
- Hepatology
- Cardiovascular Research
- Translational Medicine
Background:
- Remote ischemic preconditioning (RIPC) is a potential strategy to mitigate organ damage during ischemia reperfusion injury (IRI).
- The mechanisms underlying RIPC's protective effects, particularly in hepatic IRI, require further elucidation.
- The role of nitric oxide (NO) in mediating RIPC's benefits warrants investigation.
Purpose of the Study:
- To investigate the efficacy of RIPC in preventing hepatic IRI in a rat model.
- To assess the impact of RIPC on biomarkers of oxidative stress and inflammatory cytokines in hepatic IRI.
- To determine if the protective effects of RIPC are mediated through nitric oxide (NO).
Main Methods:
- Twenty-five rats were allocated into five groups: Sham, RIPC, hepatic IRI, RIPC + hepatic IRI, and C-PTIO + RIPC + hepatic IRI.
- Biomarkers including aspartate aminotransferase (AST), alanine aminotransferase (ALT), and malondialdehyde (MDA) were measured.
- Histological examination assessed liver tissue damage.
- Levels of inflammatory cytokines such as tumor necrosis factor-alpha (TNF-α) and nuclear factor kappa B (NF-κB) were evaluated.
Main Results:
- RIPC significantly reduced AST, ALT levels, histological damage, and MDA activity in hepatic IRI.
- RIPC did not significantly decrease TNF-α and NF-κB levels, indicating no significant anti-inflammatory effect.
- Inhibition of NO with C-PTIO abolished the protective effects of RIPC, with significant worsening of AST, ALT, and liver morphology compared to the RIPC + hepatic IRI group.
- RIPC effectively downregulated oxidative stress markers but not inflammatory cytokines.
Conclusions:
- RIPC confers protection against hepatic IRI primarily by reducing oxidative stress, rather than by suppressing inflammatory cytokines.
- The protective mechanism of RIPC in hepatic IRI involves the activation of nitric oxide (NO) and antioxidant pathways.
- RIPC demonstrates potential as a therapeutic strategy for managing hepatic ischemia reperfusion injury.
