Cellular activation patterns of the main olfactory bulb and accessory olfactory bulb following exposure to beddings soiled by same- or opposite-sex conspecifics in Mandarin voles (Microtus mandarinus)

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Abstract:

Using induction of Fos as an index, we studied cellular activation patterns in the accessory olfactory bulb (AOB) and main olfactory bulb (MOB) of Mandarin voles (Microtus mandarinus (Milne-Edwards, 1871)) following their exposure to beddings soiled by different sexes. Male and female Mandarin voles that were exposed to beddings soiled by the opposite sex produced significantly more Fos-immunoreactive (Fos-ir) neurons in the anterior portion of the AOB and significantly fewer Fos-ir neurons in the posterior portion of the AOB than voles exposed to beddings soiled by the same sex. Furthermore, male and female Mandarin voles exposed to bedding soiled by different sex produced different numbers of Fos-ir cells in MOB. Mandarin voles exposed to beddings soiled by the opposite sex produced significantly more Fos-ir neurons in MOB than voles exposed to beddings soiled by the same sex. Our results establish that Mandarin voles of each sex showed different cellular activation patterns in AOB and MOB following exposures to sex-specific beddings. We suggest that both AOB and MOB were involved in sexual activities induced by chemosensory signals.

En utilisant comme indice l’induction de Fos, nous avons étudié les patrons d’activation cellulaire du bulbe olfactif accessoire (AOB) et du bulbe olfactif principal (MOB) chez des campagnols mandarins (Microtus mandarinus (Milne-Edwards, 1871)) après une exposition à la litière souillée des deux sexes. Après une exposition à la litière souillée du sexe opposé, les campagnols mandarins mâles et femelles produisent significativement plus de neurones Fos-positifs dans la portion antérieure de leur AOB et significativement moins de neurones Fos-positifs dans la portion postérieure que les campagnols exposés à la litière souillée d’animaux du même sexe. De plus, les campagnols mandarins mâles et femelles exposés à la litière souillée du sexe opposé produisent des nombres différents de cellules Fos-positives dans leur MOB. Les campagnols mandarins exposés à la litière souillée du sexe opposé produisent significativement plus de neurones Fos-positifs dans leur MOB que les campagnols exposés à la litière souillée du même sexe. Nos résultats démontrent que les campagnols mandarins des deux sexes possèdent des patrons d’activation cellulaire différents dans leur AOB et leur MOB après une exposition à la litière d’un sexe en particulier. Nous croyons que tant le AOB que le MOB sont impliqués dans les activités sexuelles induites par les signaux chimiques sensibles.

Document Type: Research Article

Publication date: August 1, 2006

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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