Abstract: Objective To investigate the protective effect of Apelin-13 on focal cerebral ischemia-reperfusion injury in rats.
Methods Focal transient cerebral ischemia-reperfusion injury was induced in male SD rats using modified suture occlusion
technique. The rats were randomly divided into 5 groups: Sham group, Model group, Apelin-low dose (A) group,
Apelin-middle dose (B) group and Apelin-high dose (C) group. Apelin-13 was injected into lateral cerebral ventricle, and the
neurological function score, brain edema, infarct volume, apoptosis, malondialdehyde (MDA), superoxide dismutase (SOD)
and extracellular regulated kinase1/2 (ERK1/2) protein were measured. Results Neurological function scores, percentage of
brain water content, infarct volumes and TUNEL-positive cells in B and C groups were lower than those in Model group (P<
0.05). The level of MDA in the tissue bomogenate of brain tissue in the surrounding area of ischemia of B and C groups was
lower than that of Model group, while the activity of SOD was higher (P<0.05). There was no significant difference in ERK1/2
protein expression among the groups (P>0.05). P-ERK1/2 increased in Model group and A, B, and C groups compared with
Sham group (P<0.05), and that of A, B, and C group was higher than that of Model group (P<0.05). Conclusion Apelin-13 may
play an important role by inhibiting oxidative stress to protect against focal cerebral ischemia-reperfusion injury; ERK1/2
signaling pathway may be involved in the protective mechanism of Apelin-13.