[Effects of liposomal prostaglandin E(1) on myocardial reperfusion injury in rabbits]

OBJECTIVE: To probe into the role of liposomal prostaglandin E(1) (Lipo-PGE(1)) on reperfusion injury in a rabbit ischemia-reperfusion model. METHODS: Twenty-four open-chest rebbits were randomized to receive a 10 min intravenous infusion of either liposome diluent, free PGE(1), or Lipo-PGE(1) after 60 min of left anterior desending (LAD) ligation just before reperfusion. Serum creatine phosphokinase (CPK), malodialdehyde (MDA), superoxide dismutase (SOD) were detected; infarct size and region at risk were measured. RESULTS: Infarct size as a ratio of weight of infarcted tissue to weight at risk (MI/RISK) was significantly reduced with Lipo-PGE(1) (32.20+/-4.70)% compared with PGE(1) (42.09+/-6.93)% or placebo (44.57+/-5.46)% infusion (P<0.01). The values of serum CPK, MDA during reperfusion in treatment of Lipo-PGE(1) group were significantly reduced than in treatment of PGE(1) group or control group (P<0.05), and the values of serum SOD were significantly increased (P<0.05). CONCLUSION: Lipo-PGE(1) can effectively decrease the serum CPK and MDA contents, elevate the SOD activity, and attenuate myocardial reperfusion injury.