Shifts in hormonal stress reactivity during adolescence are not associated with changes in glucocorticoid receptor levels in the brain and pituitary of male rats.

Abstract:

:Preadolescent animals display protracted hormonal stress responses mediated by the hypothalamic-pituitary-adrenal (HPA) axis compared to adults. Though the mechanisms that underlie this shift in stress reactivity are unknown, reduced glucocorticoid-dependent negative feedback on the HPA axis has been posited to contribute to this differential responsiveness. As the glucocorticoid receptors (GRs) are integral to this feedback response, we hypothesize that prior to puberty there will be fewer GRs in the neural-pituitary network that mediate negative feedback. To test this hypothesis we measured GR protein levels in the brains of preadolescent (28 days old), midadolescent (40 days old) and adult (77 days old) male rats via immunohistochemistry. Additionally, we assessed stress-induced plasma adrenocorticotropic hormone and corticosterone in prepubertal (30 days old) and adult (70 days old) male rats and examined GR protein levels via Western blot in the brain and pituitary. We found that despite substantial adolescent-related changes in hormonal responsiveness, no significant differences were found between these ages in GR protein levels in regions that are important in negative feedback, including the medial prefrontal cortex, paraventricular nucleus of the hypothalamus, hippocampal formation, and pituitary. These data indicate that the extended hormonal stress response exhibited by preadolescent animals is independent of significant pubertal changes in GR protein levels.

journal_name

Dev Neurosci

authors

Dziedzic N,Ho A,Adabi B,Foilb AR,Romeo RD

doi

10.1159/000362873

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

261-8

issue

3-4

eissn

0378-5866

issn

1421-9859

pii

000362873

journal_volume

36

pub_type

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