Immediate postconditioning during reperfusion attenuates intestinal injury.

Area of Science:

• Gastroenterology
• Surgical Research
• Cardiovascular Research

Background:

• Intestinal ischemia/reperfusion (II/R) injury is a significant clinical challenge.
• Current therapeutic strategies for II/R injury have limitations.

Purpose of the Study:

• To evaluate the protective effects of immediate and delayed ischemic postconditioning (IPo) on II/R injury.
• To investigate the potential synergistic effects of combining ischemic preconditioning (IPC) with IPo.

Main Methods:

• A prospective laboratory animal study using Sprague-Dawley rats.
• II/R injury was induced by clamping the superior mesenteric artery.
• IPC was applied before II/R, and IPo was applied immediately or delayed after reperfusion onset.

Main Results:

• II/R caused significant intestinal injury, evidenced by increased Chiu's scores, wet-to-dry weight ratio, inflammatory markers (TNF-α, IL-6), malondialdehyde, and myeloperoxidase activity.
• Both IPC and immediate IPo significantly attenuated II/R-induced injury.
• Delayed IPo did not provide significant protection, while the combination of IPC and IPo demonstrated synergistic protective effects.

Conclusions:

• Immediate IPo effectively reduces intestinal injury by mitigating oxidative stress, neutrophil infiltration, and inflammatory responses.
• The timing of IPo is critical, with protection observed only when initiated immediately upon reperfusion.
• Combining IPC with immediate IPo enhances intestinal protection, suggesting a valuable therapeutic approach.