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Volume 17, Number 11,
Issue of June 1, 1997
pp. 4331-4340
Copyright ©1997 Society for Neuroscience
Vasopressin/Serotonin Interactions in the Anterior Hypothalamus
Control Aggressive Behavior in Golden Hamsters
Received Oct. 11, 1996; revised Feb. 12, 1997; accepted March 21, 1997.
Craig F. Ferris1,
Richard H. Melloni Jr1,
Gary Koppel2,
Kenneth W. Perry2,
Ray W. Fuller2, and
Yvon Delville1
1 Neuropsychiatric Sciences Program, Department of
Psychiatry, University of Massachusetts Medical Center, Worcester,
Massachusetts 01655, and 2 Lilly Research Laboratories, Eli
Lilly and Company, Lilly Corporate Center, Indianapolis, IN 46285
Studies in several species of rodents show that arginine
vasopressin (AVP) acting through a V1A receptor facilitates
offensive aggression, i.e., the initiation of attacks and bites,
whereas serotonin (5-HT) acting through a 5-HT1B receptor
inhibits aggressive responding. One area of the CNS that seems critical
for the organization of aggressive behavior is the basolateral
hypothalamus, particularly the anterior hypothalamic region. The
present studies examine the neuroanatomical and neurochemical
interaction between AVP and 5-HT at the level of the anterior
hypothalamus (AH) in the control of offensive aggression in Syrian
golden hamsters. First, specific V1A and 5-HT1B
binding sites in the AH are shown by in vitro receptor
autoradiography. The binding for each neurotransmitter colocalizes with
a dense field of immunoreactive AVP and 5-HT fibers and putative
terminals. Putative 5-HT synapses on AVP neurons in the area of the AH
are identified by double-staining immunocytochemistry and laser
scanning confocal microscopy. These morphological data predispose a
functional interaction between AVP and 5-HT at the level of the AH.
When tested for offensive aggression in a resident/intruder paradigm, resident hamsters treated with fluoxetine, a selective 5-HT
reuptake inhibitor, have significantly longer latencies to bite and
bite fewer times than vehicle-treated controls. Conversely, AVP
microinjections into the AH significantly shorten the latency to bite
and increase biting attacks. The action of microinjected AVP to
increase offensive aggression is blocked by the pretreatment of
hamsters with fluoxetine. These data suggest that 5-HT inhibits fighting, in part, by antagonizing the aggression-promoting action of
the AVP system.
Key words:
fluoxetine;
vasopressin;
serotonin;
anterior
hypothalamus;
offensive aggression;
V1A receptor;
5-HT1B receptor;
serenic;
flank marking
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