Effect of photoperiod on vasopressin-induced aggression in Syrian hamsters.

Abstract:

:Syrian hamsters are photoperiodic and become sexually quiescent when exposed to short "winter-like" photoperiods. In short photoperiods, male hamsters display significantly higher levels of aggression than males housed in long photoperiods. Arginine-vasopressin (AVP) within the anterior hypothalamus (AH) has been reported to modulate aggression in hamsters housed in long photoperiods. Previous studies have shown that AVP can facilitate aggression and its effects appear to be mediated by AVP V(1a) receptors (V(1a)R). In the present study, we investigated whether the increased levels of aggression observed after exposure to short photoperiod were the result of an increased responsiveness to AVP within the AH. Injections of AVP into the AH significantly increased aggression in hamsters housed in a long photoperiod, but had no effect in hamsters housed in a short photoperiod. In addition, injection of a V(1a)R antagonist into the AH significantly inhibited aggression in hamsters housed in long photoperiod, but had no effect in hamsters housed in a short photoperiod. These findings indicate that AVP within the AH increases aggression in hamsters housed in long photoperiods, but not in hamsters housed in short photoperiods.

journal_name

Horm Behav

journal_title

Hormones and behavior

authors

Caldwell HK,Albers HE

doi

10.1016/j.yhbeh.2004.04.006

keywords:

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

444-9

issue

4

eissn

0018-506X

issn

1095-6867

pii

S0018506X04001308

journal_volume

46

pub_type

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