M. Sakaue, Y. Ago, C. Sowa, Y. Sakamoto, Beni Nishihara, Y. Koyama, A. Baba, T. Matsuda
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Modulation by 5-hT2A receptors of aggressive behavior in isolated mice.
The present study examines whether isolation-rearing affects sensitivity of 5-hydroxytryptamine (5-HT)2A receptors and the functional interaction between 5-HTIA and 5-HT2A receptors in mice. The 5-HT2A-receptor agonist (+/-)-1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane hydrochloride (DOI)-induced head twitch response was significantly greater in isolated mice than in grouped mice. DOI increased isolation-induced aggressive behavior, and the 5-HT2A-receptor antagonist ritanserin decreased it. The 5-HTIA-receptor agonist (S)-5-[3-[(1,4-benzodioxan-2-ylmethyl)amino]propoxy]-1,3-benzodioxole HCl (MKC-242) inhibited the DOI-enhanced aggressive behavior. MKC-242 inhibited DOI-induced head twitch response. These findings suggest that 5-HT2A receptors play a role in aggressive behavior in isolated mice and imply that the antiaggressive effect of MKC-242 may be mediated partly by the inhibition of 5-HT2A-receptor function.
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