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17 beta-Estradiol in vitro affects Na-dependent and depolarization-induced Ca2+ transport in rat brain synaptosomes

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Authors
Nikezic, G
Horvat, Anica
Nedeljkovic, N
Martinović, Jelena
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Abstract
Effects of 17 beta-estradiol (E(2)) in vitro on Na-dependent Ca2+ efflux from, and depolarization-induced Ca2+ uptake into, the nerve cell were studied with the use of synaptosomes isolated from the brain stem, mesencephalic reticular formation (MRF), caudate nucleus and the hippocampus of long-term ovariectomized adult female rats. It was found that E(2) (1) at a concentration of 10 nM or lower, stimulates Na-dependent Ca2+ efflux in the caudate nucleus and hippocampus, and does not affect the efflux in MRF and brain stem; (2) at concentrations above 10 nM has no effect on the Ca2+ efflux in any of the four structures investigated; and (3) produces a biphasic effect on the depolarization-induced Ca2+ uptake, increasing it in all structures except MRF at 10 nM concentration, and decreasing it at concentrations higher than 10 nM, irrespective of the structure investigated. These results suggest that E(2), acting at extranuclear sites, modulates synaptic transmission via alterations of C...a2+ transport mechanisms in nerve endings.

Keywords:
estradiol / calcium transport / synaptosomes / brain / rat
Source:
Experientia, 1996, 52, 3, 217-220

ISSN: 0014-4754 (print)

PubMed: 8631388

WoS: A1996UC55500003

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http://vinar.vin.bg.ac.rs/handle/123456789/1968
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