Document Detail

Sexual segregation in infant mice: behavioural and neuroendocrine responses to d-amphetamine administration.
MedLine Citation:
PMID:  9399377     Owner:  NLM     Status:  MEDLINE    
Individual differences arise from both genetic and epigenetic factors. The aim of this study was to test whether pups raised in distinct socio-sexual conditions would show different behavioural and neuroendocrine responses to d-amphetamine (AMPH) administration upon placement in a novel environment. This issue was addressed by testing infant CD-1 mouse pups of both sexes at three different developmental ages [3, 8, or 18 postnatal (PND) days]. These pups were raised from birth in all-male, all-female, or mixed-sex litters. AMPH effects were assessed as a function of the hypothalamic-pituitary-adrenal (HPA) axis activational state using litters that were either maternally deprived for 24 h (DEP) or normally kept with the dam (NDEP). A concomitant maternal behaviour score carried out on selected postpartum days showed that mothers taking care of all-male litters were more often involved in Active nursing than those rearing the mixed-sex ones, whereas the latter were found more often Laying still out of the nest. Basal and stress-induced corticosterone (CORT) secretion was increased in unisexually reared pups following maternal deprivation, an effect limited to PND 3. In general, neuroendocrine and behavioural responses to AMPH were found to be dissociated and were affected by sexual segregation only in conjunction with maternal deprivation. On PND 3, AMPH injection (1 or 3 mg/kg, i.p.) decreased CORT secretion in deprived unisexually reared subjects without affecting their behaviour. As a whole, behavioural changes due to unisexual rearing were limited to female subjects. On PND 8, unisexually reared females showed, upon maternal deprivation, a generalized shift to the left in the dose-response curve to AMPH for Crossing behaviour, while on PND 18 AMPH-induced stereotypies were considerably reduced in sexually segregated females, especially following maternal deprivation. Thus, maternal deprivation appeared to "sensitize" the monoaminergic system to an AMPH challenge. The individual behavioural and neuroendocrine profiles shown in response to a stressful challenge suggest that changes in social stimulation early during development might produce subtle shifts in the function of selected central monoaminergic systems.
F Cirulli; W Adriani; G Laviola
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Psychopharmacology     Volume:  134     ISSN:  0033-3158     ISO Abbreviation:  Psychopharmacology (Berl.)     Publication Date:  1997 Nov 
Date Detail:
Created Date:  1998-01-09     Completed Date:  1998-01-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7608025     Medline TA:  Psychopharmacology (Berl)     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  140-52     Citation Subset:  IM    
Section of Behavioural Pathophysiology, Istituto Superiore di Sanità, Roma, Italy.
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MeSH Terms
Aging / psychology
Behavior, Animal / drug effects*
Body Weight / drug effects
Central Nervous System Stimulants / pharmacology*
Corticosterone / blood
Dextroamphetamine / pharmacology*
Dose-Response Relationship, Drug
Maternal Behavior
Neurosecretory Systems / drug effects*
Sex Characteristics
Reg. No./Substance:
0/Central Nervous System Stimulants; 50-22-6/Corticosterone; 51-64-9/Dextroamphetamine

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

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