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Inactivation of potassium‐evoked adrenomedullary catecholamine release in the presence of calcium, strontium or BAY‐K‐8644
Author(s) -
Sala F.,
Fonteriz R.I.,
Borges R.,
García A.G.
Publication year - 1986
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(86)80209-5
Subject(s) - depolarization , catecholamine , chemistry , calcium , endocrinology , secretion , potassium , medicine , adrenal medulla , activator (genetics) , biophysics , biology , biochemistry , receptor , organic chemistry
The rate of catecholamine release from cat adrenal glands perfused with Krebs solution containing 59 mM K declined exponentially during the first few minutes of depolarization. The rate of decline was considerably slower when Ca was substituted by Sr. The late addition of Ca, Sr or the Ca‐channel activator BAY‐K‐8644 evoked a revival of secretion when catecholamine release was inactivated by prior K depolarization; the revival of secretion was independent of the depolarization time. These data demonstrate that inactivation of catecholamine release is specifically dependent on Ca; the modulatory role of Ca on secretion seems to be exerted at a step distal to the transmembraneous Ca channel.