Sex and gonadal steroid modulation of pheromone receptor gene expression in the mouse vomeronasal organ

Neuroscience
Olga V AlekseyenkoJames A Cherry

Abstract

Non-volatile chemosignals in rodents are detected by unique receptors in the vomeronasal organ of the accessory olfactory system. Although the vomeronasal organ has been implicated in the regulation of sexually dimorphic behavioral and neuroendocrine functions, the underlying cellular mechanisms are undetermined. In previous studies we showed that exposure to soiled male bedding augmented immediate early gene immunoreactivity in neurons of the basal zone of the vomeronasal organ, an effect that depended on gender and sex steroid expression. To determine whether this effect could be due to differences in vomeronasal organ receptor expression, we examined two representatives (VR1 and VR4) from different subfamilies of the V2R family of receptors that are expressed in the basal zone of the vomeronasal organ. Adult Swiss-Webster male and female mice were gonadectomized and implanted with capsules containing 17beta-estradiol, testosterone or neither steroid (control). Two weeks later vomeronasal organs were processed for in situ hybridization using probes from the N-terminal extracellular domains of VR1 and VR4. Expression of both VR1 and VR4 was significantly higher in males than in females. Estradiol, but not testosterone-treated,...Continue Reading

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