Sources of variation in HPG axis reactivity and individually consistent elevation of sex steroids in a female songbird

Highlights • Why do some individuals make more testosterone (T) than others? • We used LH and GnRH challenges, and qPCR to assess HPG axis variation in females. • Individual variation in T was unrelated to LH levels or gonadal LH-receptor abundance. • T secretion was individually consistent, and T a...

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Bibliographic Details
Published in:General and comparative endocrinology 2013-12, Vol.194, p.230-239
Main Authors: Rosvall, Kimberly A, Bergeon Burns, Christine M, Hahn, Thomas P, Ketterson, Ellen D
Format: Article
Language:English
Subjects:
androgen receptors
Animals
Endocrinology & Metabolism
estradiol
Estrogen
Estrogens - metabolism
evolution
Female
females
gonadotropin-releasing hormone
Gonadotropin-Releasing Hormone - pharmacology
Gonads - drug effects
Gonads - metabolism
Hypothalamo-Hypophyseal System - drug effects
Hypothalamo-Hypophyseal System - metabolism
Hypothalamo-pituitary–gonadal axis
Individual differences
Junco hyemalis
luteinizing hormone
Luteinizing Hormone - pharmacology
luteinizing hormone receptors
Male
males
messenger RNA
phenotype
Pituitary-Adrenal System - drug effects
Pituitary-Adrenal System - metabolism
social behavior
Songbirds
steroid hormones
steroids
Testosterone
Testosterone - metabolism
unspecific monooxygenase
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Description
Summary:Highlights • Why do some individuals make more testosterone (T) than others? • We used LH and GnRH challenges, and qPCR to assess HPG axis variation in females. • Individual variation in T was unrelated to LH levels or gonadal LH-receptor abundance. • T secretion was individually consistent, and T and estradiol were positively correlated. • Findings suggest that the gonad holds the key to individual differences in sex steroids.
ISSN:0016-6480
1095-6840
DOI:10.1016/j.ygcen.2013.09.015