Calcium ionophores increase intracellular pH in chicken granulosa cells.

Abstract:

:Several hormone agonists exert their physiological actions by triggering an inositol phospholipid-Ca2+ signalling cascade and cytosolic alkalinization. Although calcium ionophores have been used extensively to probe the role of Ca2+ in the regulation of steroidogenesis in granulosa cells, the precise relationship between changes in intracellular Ca2+ (Ca2+i) and pH (pHi) is unclear. In the present study we have used a fluorescent pH indicator, 2'7'-bis-(2-carboxyethyl)-5(and-6)-carboxyfluorescein, to examine the influence of two Ca2+ ionophores, ionomycin and 4-Bromo-A23187 (4-Br-A23187), on pHi in chicken granulosa cells. Chicken granulosa cells from the largest preovulatory follicle were incubated with Ca2+ ionophores (0-2 microM) and/or inhibitors of Na+/H+ antiport (amiloride, dimethylamiloride and ethylisopropyl amiloride; 0.5, 5 and 50 microM respectively) in the presence of Na+ (or choline+; 0-144 mM) and/or Ca2+ (0-10 mM). Ionomycin or 4-Br-A23187 elicited a rapid and sustained cytosolic alkalinization. The magnitude of increase in pHi was dependent on the concentration of the Ca2+ ionophore and the presence of extracellular Ca2+ but independent of extracellular Na+. Pretreatment of the cells with amiloride or its analogues failed to affect the increase in pHi induced by the Ca2+ ionophores significantly. These findings demonstrate that, in addition to their widely reported effects on Ca2+i redistribution in granulosa cells, 4-Br-A23187 and ionomycin cause Ca(2+)-dependent cytosolic alkalinization. This action of the Ca2+ ionophores is independent of the Na+/H+ antiport. Caution must be exercised in using Ca2+ ionophores as probes to define the role of Ca2+ in the regulation of granulosa cell function.

journal_name

J Mol Endocrinol

authors

Asem EK,Li M,Tsang BK

doi

10.1677/jme.0.0090001

subject

Has Abstract

pub_date

1992-08-01 00:00:00

pages

1-6

issue

1

eissn

0952-5041

issn

1479-6813

journal_volume

9

pub_type

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