The influence of gender and sex hormones upon both the hypothalamic-pituitary-adrenal (HPA) axis and the immune and inflammatory responses is well recognized, but it is not clear to what extent the two effects are interdependent. We have investigated this interaction using a chronic inflammation model. Corticosterone levels were measured in mature BALB/c male and female mice, which were intact, sham-operated or gonadectomized. No significant differences were found between groups in baseline corticosterone, but systemic inflammation (cotton-induced granulomas) resulted in stimulation of the HPA axis in a reproducible pattern. Corticosterone levels were higher in sham-operated females than in males, but gonadectomy had opposing effects in the two genders, resulting in reduced levels in females but significantly increased levels in males. A similar pattern emerged after stimulation by ether exposure or injection of interleukin-1β. In the chronic inflammatory model, replacement of ovariectomized females with physiological levels of progesterone restored a response similar to that of intact females. Physiological levels of 5α-dihydrotestosterone prevented the increase in corticosterone levels caused by castration in males and also resulted in reduced corticosterone levels in sham-operated females. Oestradiol treatment did not affect corticosterone levels. Release of interleukin-1 by peritoneal macrophages from intact and gonadectomized mice with chronic inflammation followed a similar pattern, females releasing more than males. These data suggest a complex inter-relationship between sex steroids, inflammatory stimuli and the HPA axis, such that females have a greater tendency than males to generate activating signals and in addition have a greater sensitivity to such factors.
Journal of Endocrinology (1993) 136, 389–397
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