Document Detail


Central forebrain Fos responses to familiar male odours are attenuated in recently mated female mice.
MedLine Citation:
PMID:  11168544     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Exposure of recently mated female mice to the urinary odours of an unfamiliar male blocks pregnancy (the Bruce effect). The absence of a pregnancy block in response to the stud male's familiar odours depends on an olfactory memory that is formed in the accessory olfactory bulb (AOB) in response to vomeronasal organ (VNO) inputs during mating. Sexually naive Balb/c female mice in pro-oestrus/oestrus were either placed onto soiled bedding ('bedding-only' females) from, or allowed to mate with, a Balb/c male ('recently mated' females). After 42 h, females were placed for 90 min onto clean bedding (controls) or onto soiled bedding from either a C57BL/6 male (unfamiliar bedding) or a Balb/c male (familiar bedding). Significant increases in Fos-immunoreactivity (Fos-IR, a marker of neuronal activation) occurred in the medial amygdala and the medial preoptic area (MPA) of 'bedding only' females exposed to either unfamiliar or familiar bedding and in 'recently mated' females exposed to unfamiliar bedding but not to familiar bedding. This suggests that a mating-induced memory prevents the later activation by the familiar stud male's odours of neurons in forebrain regions that receive inputs from the VNO--AOB. 'Bedding-only' females later exposed to either familiar or unfamiliar bedding had increased Fos-IR in the G alpha(o) protein-expressing basal zone of the VNO whereas no such effect occurred in 'recently mated' females. Familiar, as well as unfamiliar, male odours augmented Fos-IR in significantly more rostral than caudal AOB granule cells in all groups, with the effect being strongest in 'recently mated' females exposed to familiar male bedding. This outcome is consistent with the absence of odour-induced Fos-IR in forebrain regions of these females and, presumably, the absence of a pregnancy block.
Authors:
H A Halem; J A Cherry; M J Baum
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The European journal of neuroscience     Volume:  13     ISSN:  0953-816X     ISO Abbreviation:  Eur. J. Neurosci.     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-02-22     Completed Date:  2001-05-10     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8918110     Medline TA:  Eur J Neurosci     Country:  France    
Other Details:
Languages:  eng     Pagination:  389-99     Citation Subset:  IM    
Affiliation:
Department of Biology, Boston University, Boston, MA 02215, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Copulation / physiology
Female
Immunohistochemistry
Male
Mice
Mice, Inbred BALB C
Neurons
Odors
Olfactory Bulb / chemistry,  physiology*
Olfactory Mucosa / chemistry,  physiology
Olfactory Pathways / chemistry,  physiology*
Proto-Oncogene Proteins c-fos / analysis
Sex Attractants*
Smell / physiology*
Vomeronasal Organ / chemistry,  physiology*
Grant Support
ID/Acronym/Agency:
DC03019/DC/NIDCD NIH HHS; MH59200/MH/NIMH NIH HHS
Chemical
Reg. No./Substance:
0/Proto-Oncogene Proteins c-fos; 0/Sex Attractants

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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