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Seizure activity regulates gene expression for glial cell line-derived neurotrophic factor (GDNF) and neurturin (NRTN), and their receptor components, the transmembrane c-Ret tyrosine kinase and the glycosylphosphatidylinositol-anchored GDNF family receptor (GFR) alpha 1 and alpha 2 in limbic structures. We demonstrate here that epileptogenesis, as assessed in the hippocampal kindling model, is markedly suppressed in mice lacking GFR alpha 2. Moreover, at 6 to 8 wk after having reached the epileptic state, the hyperexcitability is lower in GFR alpha 2 knock-out mice as compared with wild-type mice. These results provide evidence that signaling through GFR alpha 2 is involved in mechanisms regulating the development and persistence of kindling epilepsy. Our data suggest that GDNF and NRTN may modulate seizure susceptibility by altering the function of hilar neuropeptide Y-containing interneurons and entorhinal cortical afferents at dentate granule cell synapses.

Development and persistence of kindling epilepsy are impaired in mice lacking glial cell line-derived neurotrophic factor family receptor α2