PMID: 9191104Jun 1, 1997Paper

Regulation of hippocampal 5-HT1A receptor mRNA and binding in transgenic mice with a targeted disruption of the glucocorticoid receptor

Brain Research. Molecular Brain Research
O C MeijerE R de Kloet

Abstract

Corticosterone is known to suppress levels of 5-HTA(1A) receptor mRNA in rat hippocampus. We describe hippocampal 5-HT(1A) receptor mRNA regulation in mice that have a targeted disruption of the glucocorticoid receptor gene. 5-HT(1A) receptor mRNA levels as well as binding of [3H]8-OH-DPAT, were measured in the hippocampus of heterozygous and homozygous GR-deficient mice and in wild-type control mice. The effect of adrenalectomy in wild-type mice and heterozygous knockouts was also studied. We hypothesized that if the glucocorticoid receptor is important as a mediator of the suppressive effect of corticosterone, this would be revealed by changed (enhanced) expression of 5-HT(1A) receptor mRNA in mice with a genetically changed glucocorticoid receptor status. It was found that 5-HT(1A) receptor mRNA levels and 5-HT(1A) receptor binding were not different in GR-deficient mice. The 5-HT(1A) receptor mRNA levels were responsive to corticosterone, as adrenalectomy led to increased levels of hippocampal 5-HT(1A) receptor mRNA both in wild-type as in heterozygous knockout mice. These increases were paralleled by small but statistically significant changes in [3H]8-OH-DPAT binding. These results support a suppressive control of B over ...Continue Reading

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Nov 13, 2004·Current Psychiatry Reports·Samuel R Chamberlain, Barbara J Sahakian
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