CORTICOTROPIN-RELEASING FACTOR ANTAGONIST INHIBITS NEURONAL DAMAGE-INDUCED BY FOCAL CEREBRAL-ISCHEMIA OR ACTIVATION OF NMDA RECEPTORS IN THE RAT-BRAIN

This study investigated the involvement of corticotrophin-releasing fa ctor (CRF) in acute neuronal damage induced by focal cerebral ischaemi a or pharmacological activation of NMDA receptors in the rat brain. In tracerebroventricular injection of a CRF receptor antagonist (alpha-he lical CRF(9-41)), markedly inhibited ischaemic (61%) and excitotoxic ( 41%) brain damage. Peripheral injection of a glucocorticoid antagonist (RU38486) did not affect ischaemic damage. Ischaemic and excitotoxic damage caused increased hypothalamic concentrations of CRF. These data indicate that CRF mediates ischaemic and excitotoxic neuronal damage in the rat, but that this effect is not dependent on glucocorticoids.