Abstract
The aim of this study was to understand the possible involvement of glial cell line-derived neurotrophic factor (GDNF) in rat brain ischemic injury by examining the expression and the cellular location of GDNF with molecular biological and morphological techniques. Expression of GDNF mRNA and protein was first increased as early as 2h after ischemia-reperfusion in peri-infarct cerebral cortex and striatum; it then declined, and showed a second increase at 72 h. Double staining confirmed that the earlier peak of GDNF expression was of neuronal origin and the later peak of glial origin. Considering the neurotrophic characteristics of GDNF, our findings suggest that elevated endogenous GDNF expression may have important roles in protection of ischemic injured neuronal cells.
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