Reactive oxygen species have been implicated in pathogenesis injury after ischaemia-reperfusion (I/R). Caffeic Acid Phenethyl Ester (CAPE), an active component of honeybee propolis extract, exhibits antioxidant and anti-inflammatory properties. The aim of this study was to investigate the effects of CAPE on erythrocyte membrane damage after hind limb I/R. Rats were divided into two groups: I/R and I/R with CAPE pre-treatment. They were anaesthetized with intramuscular ketamine 100 mg kg(-1). A 4-h I/R period was performed on the right hind limb of all animals. In the CAPE-treated group, animals received CAPE 10 microm by intraperitoneal injection 1 h before the reperfusion. At the end of the reperfusion period, a midsternotomy was performed. A 5-ml blood sample was withdrawn from the ascending aorta for biochemical assays. Serum and erythrocyte membrane MDA levels were significantly lower in the CAPE-treated group when compared to the I/R group ( p = 0.001 and p<0.001, respectively). Erythrocyte membrane Na(+)-K(+) ATPases activity in the CAPE-treated group was significantly higher than the I/R group ( p<0.001). In conclusion, CAPE seems to be effective in protecting against oxidative stress. Therefore, we suggest that in order to decrease I/R injury, pre-administration of CAPE may be a promising agent for a variety of conditions associated with I/R.
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