The vasopressin receptor (V1aR) is expressed in higher levels in the ventral for
ID: 3508536 • Letter: T
Question
The vasopressin receptor (V1aR) is expressed in higher levels in the ventral forebrain of monogamous than in promiscuous vole species. Lim et al. (2004) increased monogamous behavior in the socially promiscuous meadow vole by experimentally increasing gene expression of the V1aR. The researchers also administered a dopamine receptor antagonist which blocked pair bond formation in both vole species. From the results of their experiments they conclude that monogamous social organization in certain vole species might be the result of the insertion of the V1aR system into an ancient pre- existing reward circuit. Explain the proximate mechanisms involving vasopressin and dopamine they suggest underlies the pair bond formation. Use the Organizational/Activational Hypothesis to explain why male rats do not have a lordosis response. Make sure you explain the ultimate reason why male rats do not need a lordosis response in your answer.
Explanation / Answer
Prolonged treatment with testosterone prop ion aprop ion ate (1 my for 26 days) results in display of male as well as female sexual behavior. Lardosis behavior could be elicited by manual stimulation in castrated male rats after treatment with estradiol Benz pate. Seven intact males which showed lardosis without hormone treatment were injected with MER-25(10 my/day*10days) and lardosis was abolished in six cases. The result suggest that estrogen is involved in the regulation of lardosis behavior in TP treatment and intact male rats.
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