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Chemical Senses Advance Access published online on March 1, 2006
Chemical Senses, doi:10.1093/chemse/bjj043
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org
Accepted February 1, 2006

Article

Mouse Major Urinary Proteins Trigger Ovulation via the Vomeronasal Organ

Lorenzo Morè 1 *

1 Department of Behavioural Pharmacology, Preclinical R & D, Merz Pharmaceuticals GmbH, Eckenheimer Landstrasse 100, 60318 Frankfurt am Main, Germany; Department of Human Anatomy and Physiology, University of Padova, Via Marzolo 3, 35131 Padova, Italy

* To whom correspondence should be addressed.
Lorenzo Morè, E-mail: lorenzo.mo{at}unipd.it


  Abstract

The major urinary proteins are a species-specific complex of proteins excreted by male mice that influence the reproductive behavior and the neuroendocrine condition of female mice through the olfactory system. The aim of this work is to determine their influence on ovulation. The major urinary proteins isolated from the urine of adult male mice were voided of bound odorants, dissolved at a physiological concentration in urine of prepubertal mice, and put on the nostril of reproductively cycling female mice housed in groups, the first day of estrus at 1100. The eggs shed in the oviducts were counted under dissection the morning of the second day of estrus. The results showed that 1) a single stimulus of the major urinary proteins increased ovulation nearly as much as the whole urine of male mice, 2) the effect was not elicited by male rat urine which contains different proteins, 3) a peptide with four residues of the amino-terminal sequence of the major urinary proteins stimulated ovulation, and 4) mice that had been isolated or had the vomeronasal organ (VNO) removed did not respond to the major urinary proteins and had a high spontaneous ovulation. The results suggest that the major urinary proteins activate the neuroendocrine system through the VNO and trigger ovulation.

Keywords: eggs shed; estrus; isolation; oviduct; pheromones; urine.
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