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Differential Secretion Of Adrenaline And Noradrenaline In Response To Various Secretagogues From Bovine Chromaffin Cells
Author(s) -
Kuwashima Haruhiro,
Matsumura Chiaki,
Kimura Tomohiko
Publication year - 2000
Publication title -
clinical and experimental pharmacology and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 103
eISSN - 1440-1681
pISSN - 0305-1870
DOI - 10.1046/j.1440-1681.2000.03284.x
Subject(s) - exocytosis , secretion , histamine , chemistry , medicine , acetylcholine , endocrinology , angiotensin ii , biochemistry , biology , receptor
SUMMARY 1. Differential secretion of adrenaline (Adr) and noradrenaline (NA) in response to various secretagogues was studied in bovine adrenal chromaffin cells. 2. Acetylcholine (ACh; 3–300 μmol/L), 1,1‐dimethyl‐ 4‐phenyl‐piperazinum (DMPP; 1–100 μmol/L), high K + (20–60 mmol/L), calcimycin (1–100 μmol/L), histamine (0.3–30 μmol/L) and angiotensin (Ang)II (0.3–30 μmol/L) induced the secretion of a 1.3–2‐fold greater percentage of NA stores than Adr stores in intact cells. 3. In β‐escin‐permeabilized cells, Ca 2+ (0.1–30 μmol/L) induced a greater secretion of Adr and NA in the presence of MgATP (2 mmol/L) than in the absence of MgATP. The percentage of NA secreted was 1.4‐ and 1.5‐fold greater than that of Adr in the presence and absence of MgATP, respectively. 4. The ATP‐independent phase of the Ca 2+ ‐dependent exocytosis is thought to be associated with the final step that ultimately leads to fusion, while the ATP‐dependent phase is thought to be associated with the vesicle priming reaction. Therefore, the preferential secretion of NA in response to ACh, DMPP, high K + , calcimycin, histamine and AngII may be due, at least in part, to the greater effectiveness of Ca 2+ in producing exocytosis in NA‐containing cells.