CA(2+) mobilization in the human submandibular duct cell line A253.

Abstract:

:Ca(2+)mobilization induced by ATP, isoproterenol and the Ca(2+)-ATPase inhibitor thapsigargin in the human submandibular duct cell line A253 was investigated using the Ca(2+)-sensitive fluorescent indicator fura-2. ATP and isoproterenol increased cytosolic free Ca(2+)([Ca(2+)](i)) and subsequent exposure to thapsigargin after ATP or isoproterenol stimulation caused a further increase in [Ca(2+)](i). However, ATP and isoproterenol were not able to elicit a further increase in [Ca(2+)](i)after exposure of the cells to thapsigargin. Relatively few cells reacted to isoproterenol stimulation, but nearly all cells reacted to isoproterenol if ATP was added together with, or prior to isoproterenol stimulation. Moreover, the effect of ATP was potentiated by prior or simultaneous addition of isoproterenol. Furthermore, ATP decreased [Ca(2+)](i)in the presence of thapsigargin probably due to agonist-induced export of intracellular calcium. The results may suggest the existence of three thapsigargin sensitive pools; one opened by ATP acting through P(2)-purinergic receptors and IP(3), one opened by isoproterenol acting through beta2-adrenergic receptors, and a third pool not sensitive to ATP or isoproterenol.

journal_name

Cell Biol Int

authors

Andersson C,Zhang AL,Roomans GM

doi

10.1006/cbir.1999.0503

keywords:

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

273-7

issue

5

eissn

1065-6995

issn

1095-8355

pii

S1065-6995(99)90503-6

journal_volume

24

pub_type

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