Related Experiment Video
Updated: Aug 5, 2026
07:07
Murine Model of Intestinal Ischemia-reperfusion Injury
Published on: May 11, 2016
Ischemic preconditioning prevents postischemic P-selectin expression in the rat small intestine
1Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, School of Medicine in Shreveport, Shreveport, Louisiana 71130, USA.
The American Journal of Physiology
|December 22, 1999
Summary
Ischemic preconditioning (IPC) significantly reduces P-selectin expression, a key factor in microvascular dysfunction after intestinal ischemia-reperfusion (I/R). This protective effect is mediated by adenosine and protein kinase C (PKC).
Area of Science:
- Cardiovascular Biology
- Gastroenterology
- Immunology
Background:
- Ischemia-reperfusion (I/R) injury in the small intestine causes microvascular dysfunction.
- Leukocyte infiltration, specifically P-selectin-dependent rolling, is crucial for I/R-induced microvascular damage.
Purpose of the Study:
- To investigate if ischemic preconditioning (IPC) attenuates P-selectin expression following intestinal I/R.
- To elucidate the signaling pathways involved in IPC's protective effects.
Main Methods:
- Evaluated P-selectin expression in rat jejunum using a dual radiolabeled monoclonal antibody approach.
- Compared nonischemic control, I/R alone, and IPC + I/R groups.
- Administered adenosine deaminase, adenosine receptor antagonists (A1, A2), and protein kinase C (PKC) antagonists.
Main Results:
- I/R significantly increased jejunal P-selectin expression (sevenfold).
- IPC completely abolished the I/R-induced increase in P-selectin expression.
- Adenosine (via A1 receptors) and PKC signaling pathways were essential for IPC's effect on P-selectin expression.
Conclusions:
- IPC prevents I/R-induced P-selectin upregulation in the jejunum.
- Adenosine-initiated, PKC-dependent anti-inflammatory signaling is a key mechanism of IPC.
- P-selectin expression is a novel downstream target of IPC's protective pathway.
