Effects of Estrogen Antagonists and Agonists on the ACTH Response to Restraint Stress in Female Rats

• Published in: Neuropsychopharmacology (New York, N.Y.) Vol. 25; no. 6; pp. 881 - 891
• Main Authors: Young, Elizabeth A, Altemus, Margaret, Parkison, Valerie, Shastry, Savitha
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01.12.2001; Nature Publishing; Nature Publishing Group
• Subjects: Adrenocorticotropic Hormone - metabolism; Animals; Anti-Inflammatory Agents - administration & dosage; Anti-Inflammatory Agents - pharmacology; Behavioral psychophysiology; Biological and medical sciences; Corticosterone - administration & dosage; Corticosterone - pharmacology; Drug Implants - administration & dosage; Drug Implants - pharmacology; Estradiol - pharmacology; Estrogen; Estrogen Antagonists - pharmacology; Estrogens; Estrogens - agonists; Feedback - drug effects; Female; Females; Fundamental and applied biological sciences. Psychology; Gender differences; Glucocarticoids; Glucocorticoids - antagonists & inhibitors; Hormones; Hormones and behavior; HPA axis; Hypothalamo-Hypophyseal System - drug effects; Male; Males; Nitromifene - pharmacology; Oophorectomy; Ovariectomy; Progesterone - pharmacology; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Rats; Rats, Sprague-Dawley; Restraint, Physical; stress; Stress, Psychological - metabolism; Tamoxifen; Tamoxifen - pharmacology; Ann Arbor Michigan; United States > US; stress; HPA axis; Glucocarticoids; Tamoxifen; Estrogen; Estrogen receptor; Agonist; Intraperitoneal administration; Rat; Hypothalamohypophysoadrenal axis; Corticosterone; Peptide hormone; Antiestrogen; Antihormone; Glucocorticoid; Estradiol; Progestagen; Female; Antagonist; Non steroid compound; Steroid hormone; Rodentia; Emotion emotionality; Long term; Ovarian hormone; Stress; Tamoxifene; Vertebrata; Mammalia; Adrenocorticotropic hormone; Adenohypophyseal hormone; Animal; Adrenal hormone; Progesterone; Sex steroid hormone
• ISSN: 0893-133X; 1740-634X
• DOI: 10.1016/S0893-133X(01)00301-3

Previous studies have found that female rats are less sensitive than males to hypothalamic-pituitary-adrenal axis feedback inhibition by exogenous glucocorticoid administration. To determine whether estrogen contributes to this sex difference, we examined the effects of the estrogen antagonists tamoxifen and C1628 on the ACTH and corticosterone responses to restraint stress. CI628 increased both the ACTH and corticosterone response to restraint stress, and tamoxifen increased the ACTH response to restraint. Using overiectomized female rats, we also examined the effects of seven days of estradiol and/or progesterone replacement. Low dose estradiol decreased the ACTH but not the corticosterone response to restraint stress while progesterone had no effect on ACTH or corticosterone responses. The combination of estradiol and progesterone also decreased the ACTH response to stress, and the magnitude of the effect did not differ from that found with estradiol treatment alone. These data suggest that in the physiological range estradiol is an important inhibitory factor in the hypothalamic-pituitary-adrenal stress response of females.