Abstract：
BACKGROUND:Studies in mammals indicate a role for sex hormones in the regulation of hypothalamic-pituitary-adrenal (HPA)-axis reactivity. However, in humans, experimental paradigms investigating long-term exposure to sex hormones are sparse, limiting the understanding of the influence of sex hormones on HPA-axis activity. Gender-affirming hormone therapy (GAHT) in transgender persons enables to study the physiological role of sex steroids partially uncoupled from the distinct genetic background of men and women. METHODS:Ten transwomen (male genotype and female gender identity) and 15 transmen (female genotype and male gender identity) were investigated at baseline and following three months of GAHT by means of the combined dexamethasone (dex)/CRH-test. Linear mixed-effects model analysis was used to assess changes over time and to identify determinants of HPA-axis reactivity. RESULTS:In response to CRH, overall ACTH (+18%) as well as cortisol (+15%) output were increased in transwomen after 3-months of estrogen and antiandrogen treatment, while the opposite was the case for transmen after testosterone treatment (-15% and -58%, respectively). The ACTH/Cortisol-ratio indicated that testosterone attenuated sensitivity for ACTH at the adrenal level in transmen. Interestingly, copeptin levels before CRH administration were a strong predictor of overall cortisol secretion. CONCLUSIONS:This is the first study demonstrating long-term effects of a complete reversal of the sex-hormonal milieu on HPA-axis activity in humans. Our findings hereby expand the current knowledge of the physiology of HPA-axis regulation. and may be particularly relevant for transgender and cisgender people undergoing hormonal suppression or substitution therapies.
journal_name
Psychoneuroendocrinologyjournal_title
Psychoneuroendocrinologyauthors
Fuss J,Claro L,Ising M,Biedermann SV,Wiedemann K,Stalla GK,Briken P,Auer MKdoi
10.1016/j.psyneuen.2019.02.023subject
Has Abstractpub_date
2019-06-01 00:00:00pages
228-237eissn
0306-4530issn
1873-3360pii
S0306-4530(18)31230-7journal_volume
104pub_type
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