Stimulation of calcium uptake in cultured astrocytes by hypoosmotic stress--effect of cyclic AMP.

Abstract:

:To investigate the role of Ca2+ in astrocyte volume regulation, we determined Ca2+ fluxes following hypoosmotic stress and how these fluxes were modified by cyclic AMP. In isoosmotic conditions treatment with dibutyryl cyclic AMP (dBcAMP) caused almost a twofold increase in 45Ca2+ uptake. Efflux studies of 45Ca2+ in dBcAMP-treated cells showed three Ca2+ compartments while only two Ca2+ compartments were identified in non-dBcAMP-treated cells. Following hypoosmotic stress a twofold stimulation of 45Ca2+ uptake occurred in both non-dBcAMP-treated and dBcAMP-treated astrocytes. Stimulation of Ca2+ uptake begins at approximately 270 mOsm and is half-maximally stimulated at approximately 100 mOsm. This uptake is partly mediated through L-type 'slow' inactivating Ca2+ channels. Hypoosmotic stress also induces the release of Ca2+ from intracellular stores. The influx of extracellular Ca2+ and efflux of intracellular Ca2+ appear to be important factors in volume regulation after hypoosmotic stress. Cyclic AMP plays an important role in modulating hypoosmotically stimulated Ca2+ uptake.

journal_name

Brain Res

journal_title

Brain research

authors

Bender AS,Mantelle LL,Norenberg MD

doi

10.1016/0006-8993(94)91634-9

subject

Has Abstract

pub_date

1994-05-09 00:00:00

pages

27-35

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(94)91634-9

journal_volume

645

pub_type

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