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タイトル: Volatile female odors activate the accessory olfactory system of male mice without physical contact
著者: Muroi, Yoshikage
Ishii, Toshiaki
Komori, Seiichi
Kitamura, Nobuo
Nishimura, Masakazu
室井, 喜景
石井, 利明
北村, 延夫
キーワード: Accessory olfactory bulb
vomeronasal organ
pheromone
c-Fos
habituation-dishabituation test
sexual attraction
発行日: 2006
出版者: ELSEVIER
抄録: We previously reported that male mice are more attracted to volatile odors from intact female mice than from ovarlectornized female mice. In the present study, we investigated male attraction to volatile odors from soiled bedding collected from the cages of estrous or ovariectomized female mice. There was no difference in the total time spent sniffing volatile odors from estrous and ovariectomized female mice, suggesting that female mice emit volatile odors which are not excreted into bedding. To test this possibility, we investigated c-Fos expression in the mitral cell layer and granule cell layer of the accessory olfactory bulb 60 min after exposure of male mice to volatile odors without physical contact. Volatile odors from an estrous female mouse significantly increased the total number of c-Fos positive cells in each of the rostral and caudal granule cell layer, but not in the mitral cell layer. After exposure to volatile odors from estrous bedding, the total number of c-Fos positive cells did not increase. Volatile odors from a male mouse did not increase the total number of c-Fos positive cells. Volatile odors from an ovariectomized female mouse increased c-Fos expression only in the caudal granule cell layer. These results suggest that female mice emit specific volatile odors which are not excreted into bedding, and that the volatile odors activate the accessory olfactory system of male mice without physical contact. To characterize the female-specific volatile odors, we conducted habituation-dishabituation tests. Whereas sham-operated male mice discriminated between volatile odors of estrous and ovariectornized female mice, vomeronasal organ-removed male mice did not. These results suggest that male mice discriminated whether or not female mice were ovariectomized, by volatile odors via the accessory olfactory system, and that the female-specific volatile odors are involved in reproduction. (c) 2006 Published by Elsevier Ltd on behalf of IBRO.
記述: http://www.sciencedirect.com/science/journal/03064522
URI: http://ir.obihiro.ac.jp/dspace/handle/10322/45
ISSN: 0306-4522
出現コレクション:01001学術雑誌論文

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