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Androgen modulation of hippocampal synaptic plasticity.
N J MacLusky1, T Hajszan, J Prange-Kiel
1Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT 06520, USA. nmaclusk@uoguelph.ca
Neuroscience
|February 21, 2006
Summary
Androgens, like testosterone, are crucial for maintaining hippocampal structure and synaptic density in the brain. This neurotrophic effect is independent of estrogen in males but not females.
Area of Science:
- Neuroendocrinology
- Neurobiology
- Cellular Neuroscience
Background:
- Androgens play a role in brain function and structure.
- Hippocampal structure is vital for cognitive functions and mood regulation.
Purpose of the Study:
- To review recent findings on the role of androgens in maintaining hippocampal structure.
- To explore the mechanisms by which androgens influence hippocampal synaptic density.
Main Methods:
- Review of studies in rats and vervet monkeys.
- Analysis of the effects of testosterone, dihydrotestosterone, dehydroepiandrosterone, and flutamide on hippocampal CA1 pyramidal neurons.
Main Results:
- Testicular removal reduces synaptic density on CA1 pyramidal neurons.
- Androgen treatment rapidly reverses this reduction, indicating androgen dependence.
- Estrogen biosynthesis is not required for this effect in males, but contributes in females.
- Androgen potency does not correlate with the ability to stimulate synapse density.
Conclusions:
- Androgens are essential for maintaining hippocampal synaptic density through neurotrophic effects.
- These effects may underlie the influence of androgens on cognitive function and mood.
- Brain androgen signaling may differ from mechanisms in peripheral tissues.