Abstract
We have used an antiserum to a synthetic peptide fragment of bovine chromogranin A (ChrgA)[Tyr o] bovine ChrgA (306–313): YLSKEWEDA, together with antibodies to proenkephalin-derived peptides, to measure the release of immunoreactive peptides from nicotine-stimulated cultured bovine adrenal chromaffin cells. Over a period of 6 hr the accumulation of YLSKEWEDA immunoreactivity and Met-enkephalin Arg 6Gly 7Leu 8 (MERGL) immunoreactivity in the medium of 10 μM nicotine-stimulated cells was shown to be biphasic; the initial phase occurred in the first 15–30 min and the second phase reached a peak after 4 hr. In contrast, catecholamine release occurred monophasically over the initial 15–30 min. Investigation of the second phase of peptide accumulation revealed that it was due in part to nicotine-evoked exocytosis and in part to extracellular processing of high molecular weight precursor proteins.
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