Vellucci SV, Parrott RF, Mimmack ML. Down-regulation of BDNF mRNA, with no effect on trkB or glucocorticoid receptor m RNAs, in the porcine hippocampus after acute dexamethasone treatment.
Res Vet Sci 2001;
70:157-62. [PMID:
11356095 DOI:
10.1053/rvsc.2001.0456]
[Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Glucocorticoids bind to hippocampal mineralo-(MR) and gluco-(GR) corticoid receptors and, at high concentrations (e.g. as seen following treatment with pharmacological doses of corticosteroids or during stress), may affect hippocampal neuronal function. Such actions could involve brain-derived neurotrophic factor (BDNF), its receptor, trkB, and the excitatory neurotransmitter, glutamate. This experiment investigated the effect of a single intravenous (i.v.) injection of the synthetic glucocorticoid, dexamethasone (Dex, 5 mg kg(-1)) on gene expression for MR s, GR s, BDNF, trkB, and selected ionotropic glutamate receptor subunits (iGluRs), in the porcine hippocampus. Quantification of m RNA s in the brains of pigs (n = 4/treatment) killed 24 hours after saline or Dex administration indicated a significant Dex-induced decrease in BDNF m RNA in all hippocampal regions. However, gene expression for MR s, GR s, trkB and iGluRs was unaffected at this time-point.
Collapse