TY - JOUR
T1 - Comparison of central corticosteroid receptor expression in male Lewis and Fischer rats
AU - Jongen-Rêlo, Ana L.
AU - Pothuizen, Helen H.J.
AU - Feldon, Joram
AU - Pryce, Christopher R.
N1 - Funding Information:
We are extremely grateful to Professor E.R. de Kloet for the donation of cDNA inserts coding for rat MR or GR and for theoretical communications. Elizabeth Weber provided expert technical assistance. The research presented here was supported by a research grant from the Swiss Federal Institute of Technology Zürich, and by educational grants awarded to Helen Pothuizen by the Schuurman Schimmel van Outeren foundation, the Stichting van de Vrijvrouwe van Renswoude foundation, the Department of Education, Culture and Science of the Dutch government, and the Johnson Wax Foundation.
PY - 2002/11/20
Y1 - 2002/11/20
N2 - The histocompatible inbred Lewis (LEW) and Fischer (F344) rat strains exhibit marked phenotypic differences in the hormonal activity of the hypothalamic-pituitary-adrenal (HPA) axis. As such they provide an important comparative model for the study of HPA regulation including the central feedback regulation by the glucocorticoid transcription factors, the mineralocorticoid receptor (MR) and the glucocortiocoid receptor (GR). In adult male rats, basal nadir plasma corticosterone values were similar in the two strains whereas the amplitude and duration of the corticosterone response to restraint were significantly reduced in LEW. MR and GR mRNA expression were compared in LEW and F344 throughout the rostrocaudal extent of the hippocampus. Hippocampal MR expression was consistent throughout the rostrocaudal extent and similar in F344 and LEW males. Hippocampal GR expression was consistent throughout the rostrocaudal extent, but significantly greater in the rostral dentate gyrus and Cornu ammonis subfields in LEW males compared with F344 males. The LEW phenotype of relatively high hippocampal GR expression and HPA hypoactivity is shared by outbred rats exposed to neonatal handling and GR-overexpressing transgenic mice. Whether or not this relationship is causal, as well as the functional significance of the rostral-extent specific GR difference, remains to be elucidated.
AB - The histocompatible inbred Lewis (LEW) and Fischer (F344) rat strains exhibit marked phenotypic differences in the hormonal activity of the hypothalamic-pituitary-adrenal (HPA) axis. As such they provide an important comparative model for the study of HPA regulation including the central feedback regulation by the glucocorticoid transcription factors, the mineralocorticoid receptor (MR) and the glucocortiocoid receptor (GR). In adult male rats, basal nadir plasma corticosterone values were similar in the two strains whereas the amplitude and duration of the corticosterone response to restraint were significantly reduced in LEW. MR and GR mRNA expression were compared in LEW and F344 throughout the rostrocaudal extent of the hippocampus. Hippocampal MR expression was consistent throughout the rostrocaudal extent and similar in F344 and LEW males. Hippocampal GR expression was consistent throughout the rostrocaudal extent, but significantly greater in the rostral dentate gyrus and Cornu ammonis subfields in LEW males compared with F344 males. The LEW phenotype of relatively high hippocampal GR expression and HPA hypoactivity is shared by outbred rats exposed to neonatal handling and GR-overexpressing transgenic mice. Whether or not this relationship is causal, as well as the functional significance of the rostral-extent specific GR difference, remains to be elucidated.
KW - Fischer
KW - Glucocortiocoid receptor
KW - Hypothalamic-pituitary-adrenal axis
KW - Lewis
KW - MRNA
KW - Male
KW - Mineralocorticoid receptor
UR - http://www.scopus.com/inward/record.url?scp=0037145697&partnerID=8YFLogxK
U2 - 10.1016/S0006-8993(02)03293-6
DO - 10.1016/S0006-8993(02)03293-6
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AN - SCOPUS:0037145697
VL - 953
SP - 223
EP - 231
JO - Brain Research
JF - Brain Research
SN - 0006-8993
IS - 1-2
ER -