Abstract
In rodents, social odor sensing influences female reproductive status by affecting neuroendocrine cascades. The odor of male mouse urine can induce ovulation or block pregnancy within 3 d post coitus. Females avoid the action of such olfactory stimuli after embryonic implantation. The mechanisms underlying these changes are unknown. Here we report that shortly after mating, a surge in dopamine in the mouse main olfactory bulb impairs the perception of social odors contained in male urine. Treatment of females at 6.5 d post coitus with a dopamine D2 receptor antagonist restores social odor sensing and favors disruption of pregnancy by inhibition of prolactin release, when administered in the presence of alien male urine odors. These results show that an active sensory barrier blocks social olfactory cues detrimental to pregnancy, consistent with the main olfactory bulb being a major relay through which social odor modulates reproductive status.
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Acknowledgements
We are grateful to M. Hamon and F. Saurini (INSERM U288) for the tissue dopamine dosage and C. Sciarretta for comments. C.S. was supported by an EMBO fellowship.
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C.S. planned and performed most of the experiments and, together with L.M., drafted the manuscript. V.T. conducted the c-Fos experiment with the help of J.K.-B. and provided conceptual input. J.K.-B. also contributed to the PRL dosage experiments. M.A.B. provided the expertise for and helped conduct the behavioral experiments. L.M. is the PI; she contributed to the experimental plans, supervised the project, provided theoretical input and wrote the manuscript.
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Serguera, C., Triaca, V., Kelly-Barrett, J. et al. Increased dopamine after mating impairs olfaction and prevents odor interference with pregnancy. Nat Neurosci 11, 949–956 (2008). https://doi.org/10.1038/nn.2154
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DOI: https://doi.org/10.1038/nn.2154
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