Blockade of selectin-mediated leukocyte adhesion improves postischemic function in lamb hearts

Area of Science:

• Cardiovascular Research
• Ischemia/Reperfusion Injury
• Molecular Biology

Background:

• Leukocyte-endothelial interactions are critical in ischemia/reperfusion (I/R) injury.
• Selectins (L-, P-, E-selectin) mediate leukocyte rolling on endothelium via specific ligand binding.
• Fucoidin, a seaweed-derived oligosaccharide, inhibits selectin activity.

Purpose of the Study:

• To investigate the therapeutic potential of fucoidin in mitigating I/R injury.
• To evaluate the effect of selectin blockade on neonatal lamb heart function post-ischemia.

Main Methods:

• A blood-perfused neonatal lamb heart model was subjected to 2 hours of cold cardioplegic ischemia.
• Fucoidin (30 mg/L) was administered at reperfusion in the experimental group (Group F, n=8).
• Left ventricular function, coronary blood flow, myocardial oxygen consumption, and white blood cell counts were measured.

Main Results:

• Fucoidin treatment significantly improved recovery of left ventricular developed pressure and its first derivatives compared to controls (Group C, n=9).
• Post-ischemic coronary blood flow and myocardial oxygen consumption were significantly higher in the fucoidin group.
• While white blood cell counts were higher post-reperfusion in the fucoidin group, functional recovery was enhanced.

Conclusions:

• Selectin blockade with fucoidin demonstrates a protective effect against cold ischemia-induced cardiac dysfunction.
• These findings support the role of leukocyte-endothelial interactions in I/R injury.
• Selectin inhibition represents a promising therapeutic strategy for managing cardiac I/R injury.