Estrogen receptor-beta gene disruption potentiates estrogen-inducible aggression but not sexual behaviour in male mice

The European Journal of Neuroscience
Masayoshi NomuraSonoko Ogawa

Abstract

Aggressive behaviour of gonadally intact male mice is increased by estrogen receptor (ER)-beta gene disruption, whereas sexual behaviour remains unchanged. The elevated aggression levels following ER-beta gene disruption is pronounced during repeated aggression tests in young animals and the first aggression test in adults. In the present study, the roles of ER-beta activation in the regulation of aggressive and sexual behaviour were investigated in gonadectomized ER-beta knockout (betaERKO) and wild-type (WT) male mice treated with various doses of estrogen. Overall, estradiol benzoate (EB) treatment induced higher levels of aggression in betaERKO mice than in WT mice. In WT mice, the levels of aggression induced by EB were highest in the lowest-dose (2.5 microg/day) group and gradually decreased in higher-dosage groups. On the other hand, equally high levels of aggressive behaviour were induced by all three doses of EB in betaERKO mice. A marked genotype difference in dose responses is inferred, such that the ER-alpha-mediated facilitatory action of estrogen is more pronounced at lower and physiological doses and the ER-beta-mediated inhibitory action is only unveiled at higher doses of estrogen. In contrast to aggression, th...Continue Reading

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