The Effect of Pre-Condition Cerebella Fastigial Nucleus Electrical Stimulation within and beyond the Time Window of Thrombolytic on Ischemic Stroke in the Rats.

OBJECTIVE

To investigate the effect of neurogenic neuroprotection conferred by cerebellar fastigial nucleus stimulation (FNS) and the role of PPARγ-mediated inflammation in a rat model of cerebral ischemia reperfusion.

METHODS

After a continuous 1 hour fastigial nucleus electric stimulation, the male Sprague Dawley (SD) rats were given middle cerebral artery occlusion (MCAO) for 1, 3, 6, 9, 12 and 15 hours undergoing reperfusion with intravenous recombinant tissue plasminogen activator (rt-PA), while the control group received without FNS. After 72 h of reperfusion, the neurological deficits, infarct volume and brain edema were evaluated. The brain tissue in ischemic penumbra was determined the myeloperoxidase (MPO) activity by a spectrophotometer and expression of PPARγ was measured by Rt-PCR and Western blotting.

RESULTS

Our findings showed that FNS group had significantly reduced infarct volume and brain edema, and improved neurological deficits compared with the control group, especially in 6 h and 9 h reperfusion subgroups (p<0.05). The expression levels of PPARγ increased gradually and the peak may be before and after 9 h reperfusion, the 3 h, 6 h, 9 h, 12 h and 15 h reperfusion subgroups were higher than each control group (p<0.05). The MPO activity of 6 h, 12 h and 15 h reperfusion subgroups were higher than each control group (p<0.05).

CONCLUSIONS

The neuroprotective effects of FNS have been shown to prolong the therapeutic window in cerebral ischemia/reperfusion, which might be related to the PPARγ mediated-inflammation in penumbral region.