| Abstract: | A comparison of the responsiveness of isolated rat adrenal decapsular and glomerulosa cells to corticotrophin 1-39 (ACTH 1-39), synthetic ACTH analogs (characterized by a shorter amino acid chain length, the substitution of certain amino acids in the natural sequence by other amino acid residues, the replacement of the C-terminal carboxyl group by an amide), and proopiomelanocortin-derived peptides was performed by measuring corticosterone and aldosterone production, respectively. The potencies of the synthetic ACTH analogs correlated closely with the length of the peptides, similarly in both zones. No activity was observed with the proopiomelanocortin-derived peptides in either zone, with the exception of beta-LPH and alpha-MSH. |
