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The Journal of Neuroscience, February 1, 2003, 23(3):1019

Corticotropin Releasing Hormone Type 2 Receptors in the Dorsal Raphe Nucleus Mediate the Behavioral Consequences of Uncontrollable Stress

Sayamwong E. Hammack¹, Megan J. Schmid², Matthew L. LoPresti², Andre Der-Avakian², Mary Ann Pellymounter³, Alan C. Foster³, Linda R. Watkins², and Steven F. Maier²

¹ Department of Psychiatry and Center for Behavioral Neuroscience, Emory University, Atlanta, Georgia 30322, ² Department of Psychology and Center for Neuroscience, University of Colorado at Boulder, Boulder, Colorado 80309-0345, and ³ Neurocrine Biosciences, San Diego, California 92121

Uncontrollable shock produces a constellation of behavioral changes that are not observed after equivalent escapable shock. These include interference with escape and potentiation of fear conditioning. The activation of corticotropin-releasing hormone (CRH) receptors within the caudal dorsal raphe nucleus (DRN) during inescapable tailshock (IS) has been shown to be critical for the development of these behavioral changes. CRH binds to two receptor subtypes, both of which are found in the DRN. The present set of studies examined which CRH receptor subtype mediates the effects of IS. Intra-DRN administration of the CRH₂ receptor antagonist anti-sauvagine-30 before IS dose-dependently blocked IS-induced behavioral changes; the CRH₁ receptor antagonist 2-methyl-4-(N-propyl-N-cycloproanemethylamino)-5-chloro-6-(2,4,6-trichloranilino)pyrimidine (NBI27914), administered in the same manner, did not. Moreover, the highly selective CRH₂ receptor agonist urocortin II (Ucn II) dose-dependently caused behavioral changes associated with IS in the absence of shock. Ucn II was effective at doses 100-fold lower than those previously required for CRH. The relationship between CRH₂ receptors and DRN 5-HT is discussed.

Key words: corticotropin releasing hormone; corticotropin releasing hormone receptor; dorsal raphe nucleus; learned helplessness; serotonin; urocortin II

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Copyright © 2003 Society for Neuroscience  0270-6474/03/2331019-07$05.00/0

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