Gonadal steroid modulation of the limbic-hypothalamic- pituitary-adrenal (LHPA) axis is influenced by social status in female rhesus monkeys.

Abstract:

:Chronic stress can have a deleterious effect on the re-productive axis that, for females, is manifested in an increased incidence of infertility. However, gonadal steroids may, in turn, affect a female's response to stress as measured by activity within the limbic-hypothalamic-pituitary-adrenal (LHPA) axis. What is not clear is whether a history of exposure to stress modifies the effect of gonadal steroids on LHPA responsivity. Rhesus monkeys present a unique opportunity to assess LHPA responsivity when housed socially in groups. Under these situations, monkeys exhibit a rich network of affiliation and have established social status hierarchies. Previous work indicates that socially subordinate macaque females are hypercortisolemic due to diminished gluco-corticoid negative feedback. The present study tested the hypothesis that estradiol (E2) would decrease gluco-corticoid negative feedback, assessed from a dexamethasone (DEX) suppression test, and increase the response to corticotropin releasing factor (CRF) and that these effects would be attenuated by co-treatment with P4. In addition, we also determined whether E2 and P4 would differentially affect LHPA responsiveness to pharmacological challenge in socially dominant compared with subordinate females. Endogenous gonadal hormone secretion in female rhesus monkeys (n = 7) was suppressed by continuous treatment with a sustained release formulation of the GnRH analog leuprolide acetate (Lupron Depot). The response to a combined DEX suppression-CRF stimulation test was assessed using a counterbalanced design during a placebo (control) treatment condition and during E2, P4, and E2 + P4 re-placement therapy. Females who were members of a large breeding group of 140 adults and juveniles of both sexes, were classified as dominant (n = 4) or subordinate (n = 3) based on the relative social dominance positions within the group. Plasma levels of cortisol were significantly higher during E2 replacement compared to the other treatment conditions following DEX suppression and stimulation with CRF.

journal_name

Endocrine

journal_title

Endocrine

authors

Wilson ME,Legendre A,Pazol K,Fisher J,Chikazawa K

doi

10.1385/ENDO:26:2:089

subject

Has Abstract

pub_date

2005-03-01 00:00:00

pages

89-97

issue

2

eissn

1355-008X

issn

1559-0100

pii

ENDO:26:2:089

journal_volume

26

pub_type

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