title: Differential age-related changes of hypothalamus - pituitary - adrenal axis hormones in healthy women and men - role of interleukin 6.
abstract: Aging is accompanied by marked changes of steroid hormone levels which vary among women and men. The age-related increase of cytokines such as interleukin (IL)- 6 may modulate the endocrine system. We aimed to investigate the role of IL-6 for the gender-specific changes of acrophase steroid hormone secretion in healthy subjects during aging. Out of 120 healthy subjects, 60 men and 48 women (non luteal phase) were recruited (age: 18 to 75 years). Age was positively correlated with IL-6 (female and male: p<0.001) and adrenocorticotropic hormone (ACTH) in women only (p<0.001). Age was negatively correlated with progesterone (female and male: p<0.001), cortisol (only female: p=0.003), androstenedione (female and male: p<0.001), but not 17OH progesterone. After correction for IL-6, the age-related decrease of steroid hormones was blunted in both gender groups except for androstenedione (female and male: p<0.005). Furthermore, the ratio of serum cortisol to plasma ACTH decreased with age only in women but not in men (female: p< 0.001). Correction for IL-6 did not markedly change the negative interrelationship between age and the mentioned ratio in these women. However, a linear regression analysis revealed that the increase of ACTH in relation to cortisol depends on serum free testosterone in men (p=0.042) and on serum free 17 beta-estradiol (p<0.001) together with serum IL-6 in women (p=0.021). In conclusion, IL-6 plays an important role for acrophase pituitary and peripheral hormone secretion in women only. The gender-specific changes of cortisol in relation to ACTH depend on the age-related decrease of the respective sex hormone in both gender groups and the increase of IL-6 in women. This study underlines the hormone-like role of IL-6 in the aging process of the endocrine system in women.
authors.affiliation: Department of Internal Medicine I, University Medical Center, Regensburg, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Zietz
authors.forename: S
authors.initials: S
authors.lastname: Hrach
authors.forename: J
authors.initials: J
authors.lastname: Schölmerich
authors.forename: R H
authors.initials: RH
authors.lastname: Straub
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000097:blood; D000328:Adult; D000368:Aged; D000375:Aging / Q000378:metabolism*; D016207:Cytokines / Q000097:blood / Q000502:physiology; D005260:Female; D012739:Gonadal Steroid Hormones / Q000502:physiology; D006728:Hormones / Q000378:metabolism*; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D007030:Hypothalamo-Hypophyseal System / Q000378:metabolism*; D015850:Interleukin-6 / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D010913:Pituitary-Adrenal System / Q000378:metabolism*; D012016:Reference Values
chemical_list: D016207:Cytokines; D012739:Gonadal Steroid Hormones; D006728:Hormones; D015850:Interleukin-6; D000324:Adrenocorticotropic Hormone; D006854:Hydrocortisone