Abstract
Ovine corticotropin-releasing factor (CRF) stimulates α-MSH release and cyclic AMP accumulation in rat pars intermedia cells in culture at ED 50 values of 1 and 6 nM, respectively. The stimulatory effect of CRF on both parameters is inhibited by the dopaminergic agonist 2-bromo-α-ergocryptine (CB-154). The present data show that CRF is a potent stimulator of peptide secretion in the intermediate lobe of the pituitary gland and suggest a role of this pituitary lobe in the response to stress. In addition, the present data clearly indicate a role of cyclic AMP as mediator of the action of CRF in pars cells.
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