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Dual effects of chlorobutanol on secretory response and intracellular Ca2+ dynamics in isolated pancreatic acini of the rat.

Abstract：

:1. The effects of chlorobutanol, a widely used drug preservative, on exocrine response and intracellular Ca2+ dynamics were examined in isolated pancreatic acini of the rat. 2. Chlorobutanol (1 mg ml-1) markedly inhibited the secretory response to cholecystokinin octapeptide (CCK-8), carbamylcholine chloride (carbachol), or sodium fluoride, a direct G-protein activator. However, chlorobutanol itself induced a maximal release of amylase when the dose was increased to 4 mg ml-1. 3. An oscillatory fluctuation of cytoplasmic Ca2+ concentration, [Ca2+]c, induced by 5 pM CCK-8 or 0.3 microM carbachol was totally abolished in the presence of 1 mg ml-1 chlorobutanol. 4. A biphasic change in [Ca2+]c induced by 100 pM CCK-8, a rapid rise followed by a gradual decay, was transformed to an oscillatory fluctuation by the preservative. 5. Chlorobutanol inhibited 13 pM [125I]-CCK-8 or 0.5 nM [3H]-methylscopolamine chloride binding to the acinar cells in a dose-dependent manner. 6. These results indicate that chlorobutanol produces discernible pharmacological effects on the secretory response in rat pancreatic acinar cells through changes in the Ca2+ dynamics. Possible sites of action could be at a binding process of secretagogues to their receptors, at an activation process of a G-protein located in the plasma membrane, or at the processes following G-protein activation. However, the possibility that the preservative may distort the Ca(2+)-transport function of the plasma membrane or the membrane of intracellular organella, especially Ca(2+)-sequestering pools, cannot be excluded.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

Habara Y,Kanno T

doi

10.1111/j.1476-5381.1993.tb13628.x

subject

Has Abstract

pub_date

1993-07-01 00:00:00

pages

685-92

issue

3

eissn

0007-1188

issn

1476-5381

journal_volume

109

pub_type

杂志文章

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