Publication Search

Search for publications by

Y1 receptors regulate aggressive behavior by modulating serotonin pathways


Neuropeptide Y (NPY) is pivotal in the coordinated regulation of food intake, growth, and reproduction, ensuring that procreation and growth occur only when food is abundant and allowing for energy conservation when food is scant. Although emotional and behavioral responses from the higher brain are known to be involved in all of these functions, understanding of the coordinated regulation of emotion/behavior and physiological functions is lacking. Here, we show that the NPY system plays a central role in this process because ablation of the Y1 receptor gene leads to a strong increase in territorial aggressive behavior. After exposure to the resident-intruder test, expression of c-fos mRNA in Y1-knockout mice is significantly increased in the medial amygdala, consistent with the activation of centers known to be important in regulating aggressive behavior. Expression of the serotonin [5-hydroxytryptamine (5-HT)] synthesis enzyme tryptophan hydroxylase is significantly reduced in Y1-deficient mice. Importantly, treatment with a 5-HT-1A agonist, (+/-)-8-hydroxy-2-(di-n-propylamino)tetralin hydrobromide, abolished the aggressive behavior in Y1-knockout mice. These results suggest that NPY acting through Y1 receptors regulates the 5-HT system, thereby coordinately linking physiological survival mechanisms such as food intake with enabling territorial aggressive behavior.

Type Journal
ISBN 0027-8424 (Print)
Authors Karl, T.;Lin, S.;Schwarzer, C.;Sainsbury, A.;Couzens, M.;Wittmann, W.;Boey, D.;von Horsten, S.;Herzog, H. :
Garvan Authors Prof Herbert Herzog
Publisher Name PNAS
Published Date 2004-01-01 00:00:00
Published Volume 101
Published Issue 34
Published Pages 12742-7
Status Published In-print