Journal
NEUROREPORT
Volume 13, Issue 6, Pages 825-830Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00001756-200205070-00018
Keywords
calcium; cognitive function; estrogen; glutamate; hormone replacement therapy; neuron; progesterone
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Funding
- NIA NIH HHS [2T32AG00093-16, P01 AG1475] Funding Source: Medline
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One mechanism by which estrogen may modulate cognitive function is through potentiation of glutamate-mediated rises in intracellular calcium ([Ca2+](i)) with resultant effects on neuronal morphology and signaling. Since progesterone is a component of hormone replacement therapy (HRT), we sought to determine whether therapeutically relevant progestins attenuated or blocked estrogen potentiation of glutamate-induced [Ca2+](i) rises. 17beta-estradiol and progesterone, alone or in combination, significantly potentiated the rise in [Ca2+](i). When co-administered, progesterone attenuated the estrogen response to the level seen with progesterone alone. In contrast, medroxyprogesterone acetate (MPA) had no effect when administered alone and completely blocked the 17beta-estradiol-induced potentiation when co-administered. These results may have important implications for effective use of HRT to maintain cognitive function during menopause and aging. NeuroReport 13:825-830 (C) 2002 Lippincott Williams Wilkins.
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