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5-HT-HPA Interactions in Two Models of Transgenic Mice Relevant to Major Depression

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Abstract

Reciprocal interactions between central 5-HT system and hypothalamo-pituitary-adrenal (HPA) axis are of particular relevance with regard to depression, in which alterations of both systems have been evidenced. In order to further explore these interactions, two models of mutant mice have been used. They consisted of knock-out mice lacking the 5-HT transporter (5-HTT−/−) and of transgenic mice with impaired glucocorticoid receptor (GR-i) expression. Under control conditions, the functional properties of 5-HT1A autoreceptors in GR-i mice were as in their paired wild-type. However, both chronic stress and long term treatment with fluoxetine induced abnormal adaptive changes in 5-HT1A autoreceptor functioning in GR-i mice. On the other hand, a marked desensitization of 5-HT1A autoreceptors was found in 5-HTT−/− mice as compared with paired wild-type animals, and this phenomenon was further enhanced by exposure to stressful conditions. These data show that alterations of HPA axis at the gene level has consequences on 5-HT neurotransmission, and reciprocally, that 5-HTT knock-out affects HPA-dependent responses to stress.

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Authors and Affiliations

  1. Neuropsychopharmacologie Moléculaire, Cellulaire et Fonctionnelle, Faculté de Médecine Pitié Salpêtrière, INSERM U 288, 91 Bd de l'Hôpital, 75634, Paris Cedex 13, France

    Laurence Lanfumey

  2. Neuropsychopharmacologie Moléculaire, Cellulaire et Fonctionnelle, Faculté de Médecine Pitié Salpêtrière, INSERM U 288, 91 Bd de l'Hôpital, 75634, Paris Cedex 13, France

    Clotilde Mannoury La Cour, Nicolas Froger & Michel Hamon

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Lanfumey, L., La Cour, C.M., Froger, N. et al. 5-HT-HPA Interactions in Two Models of Transgenic Mice Relevant to Major Depression. Neurochem Res 25, 1199–1206 (2000). https://doi.org/10.1023/A:1007683810230

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