Influence of different estrogens on neuroplasticity and cognition in the hippocampus

Biochimica Et Biophysica Acta
Cindy K Barha, L A M Galea

Abstract

Estrogens modulate the morphology and function of the hippocampus. Recent studies have focused on the effects of different types of estrogens on neuroplasticity in the hippocampus and cognition. There are three main forms of estrogens found in mammals: estradiol, estrone, and estriol. The vast majority of studies have used estradiol to investigate the effects of estrogens on the brain. This review focuses on the effects of different estrogens on adult hippocampal neurogenesis, synaptic plasticity in the hippocampus, and cognition in female rats. Different forms of estrogens modulate neuroplasticity and cognition in complex and intriguing ways. Specifically, estrogens upregulate adult hippocampal neurogenesis (via cell proliferation) and synaptic protein levels in the hippocampus in a time- and dose-dependent manner. Low levels of estradiol facilitate spatial working memory and contextual fear conditioning while high levels of estradiol impair spatial working, spatial reference memory and contextual fear conditioning. In addition, estrone impairs contextual fear conditioning. Advances in our knowledge of how estrogens exert their effects on the brain may ultimately lead to refinements in targeted therapies for cognitive impairme...Continue Reading

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