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Abstract
Using a tumor cell line of the mouse anterior pituitary (AtT-20/D16-16), the various factors regulating ACTH release and the intracellular mechanisms mediating this response were investigated. CRF, catecholamines and VIP stimulate ACTH release whereas glucocorticoids and SRIF block secretion. Glucocorticoids block both ACTH synthesis and release. SRIF acts through multiple mechanisms to prevent stimulated ACTH release. Cyclic AMP and Ca++ are important second messengers in the receptor mediated release of ACTH but other mediators may also be involved. The interaction of these various CRF-like substances and inhibitors of ACTH release may result in a fine-tune regulation of corticotroph activity Such regulation may be important in the organism response to stress.
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