Abstract
Sodefrin is a newt (Cynops pyrrhogaster) pheromone that attracts sexually developed conspecific females. This pheromone has been considered to act through the olfactory organ of female newts since attraction to this substance is abolished by unilateral nostril plugging or nerve transection between the nasal cavity and the olfactory bulb. To determine the site of action of this pheromone, electro-olfactograms (EOGs) were recorded from the ventral olfactory epithelium of sexually developed female newts. The vomeronasal epithelium showed greater responses to sodefrin than the main olfactory epithelium. The EOG responses in sexually undeveloped females treated with prolactin (PRL) and gonadotropin were significantly greater than in hormone-treated males or untreated females. In ovariectomized females, the EOG response was enhanced by the treatment with PRL and estrogen. Thus, it was concluded that the main site of action of sodefrin is the vomeronasal epithelium and that the responsiveness to sodefrin is sex-dependent and hormone-dependent.
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