TY - JOUR
T1 - Influence of hormone replacement therapy and aspirin on temperature regulation in postmenopausal women
AU - Brooks-Asplund, E. M.
AU - Cannon, J. G.
AU - Kenney, W. L.
PY - 2000
Y1 - 2000
N2 - Postmenopausal women receiving estrogen-replacement therapy (ERT) regulate body temperature (T(b)) at a lower level than women not receiving hormone replacement therapy (untreated) and women using estrogen plus progesterone therapy (E + P), but it is not clear if reproductive hormones alter T(b) by directly acting on central thermoregulatory centers or indirectly via a secondary mediator(s). The purpose of the present investigation was to examine the possible involvement of pyrogenic cytokines and cyclooxygenase (COX) products (e.g., prostaglandins) in the regulation of T(b) in three groups of postmenopausal women (8 ERT, 7 E + P, and 8 untreated). We measured ex vivo secretion of cytokine agonists [tumor necrosis factor (TNF)-α and interleukin (IL)-1β and -6] and modifiers (IL-2 soluble receptor, IL-1 receptor antagonist, soluble TNF receptor type I, soluble TNF receptor type II, soluble IL-6 receptor, and soluble glycoprotein 130) from peripheral blood mononuclear cells and thermoregulatory responses at rest and during 1 h of passive whole body heating in the postmenopausal women before and after 3 days of placebo or aspirin (50 mg · day-1 · kg-1). With and without aspirin, the ERT group had a lower baseline rectal temperature (T(re); 0.44°C, P < 0.004) and a reduced T(b) threshold for cutaneous vasodilation (0.29°C and 0.38°C, P < 0.01) compared with the untreated and E + P groups, respectively. In the placebo condition, waking morning oral temperature (T(or)) correlated with ex vivo secretion of the proteins associated with IL-6 bioactivity. Aspirin caused significant reductions in waking T(or) in the E + P group and in baseline T(re) in the untreated group. However, the difference in thermoregulation brought about by steroid hormone treatment could not be explained by these relatively modest apparent influences by cytokines and COX products. Therefore, the altered thermoregulation induced by reproductive steroid therapy appears to occur via a mechanism distinct from a classic infection-induced fever.
AB - Postmenopausal women receiving estrogen-replacement therapy (ERT) regulate body temperature (T(b)) at a lower level than women not receiving hormone replacement therapy (untreated) and women using estrogen plus progesterone therapy (E + P), but it is not clear if reproductive hormones alter T(b) by directly acting on central thermoregulatory centers or indirectly via a secondary mediator(s). The purpose of the present investigation was to examine the possible involvement of pyrogenic cytokines and cyclooxygenase (COX) products (e.g., prostaglandins) in the regulation of T(b) in three groups of postmenopausal women (8 ERT, 7 E + P, and 8 untreated). We measured ex vivo secretion of cytokine agonists [tumor necrosis factor (TNF)-α and interleukin (IL)-1β and -6] and modifiers (IL-2 soluble receptor, IL-1 receptor antagonist, soluble TNF receptor type I, soluble TNF receptor type II, soluble IL-6 receptor, and soluble glycoprotein 130) from peripheral blood mononuclear cells and thermoregulatory responses at rest and during 1 h of passive whole body heating in the postmenopausal women before and after 3 days of placebo or aspirin (50 mg · day-1 · kg-1). With and without aspirin, the ERT group had a lower baseline rectal temperature (T(re); 0.44°C, P < 0.004) and a reduced T(b) threshold for cutaneous vasodilation (0.29°C and 0.38°C, P < 0.01) compared with the untreated and E + P groups, respectively. In the placebo condition, waking morning oral temperature (T(or)) correlated with ex vivo secretion of the proteins associated with IL-6 bioactivity. Aspirin caused significant reductions in waking T(or) in the E + P group and in baseline T(re) in the untreated group. However, the difference in thermoregulation brought about by steroid hormone treatment could not be explained by these relatively modest apparent influences by cytokines and COX products. Therefore, the altered thermoregulation induced by reproductive steroid therapy appears to occur via a mechanism distinct from a classic infection-induced fever.
KW - Cyclooxygenase
KW - Cytokines
KW - Estrogen
KW - Progesterone
KW - Reproductive hormones
KW - Skin blood flow
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U2 - 10.1152/ajpregu.2000.279.3.r839
DO - 10.1152/ajpregu.2000.279.3.r839
M3 - Article
C2 - 10956241
AN - SCOPUS:0033830326
SN - 0363-6135
VL - 279
SP - R839-R848
JO - American Journal of Physiology - Heart and Circulatory Physiology
JF - American Journal of Physiology - Heart and Circulatory Physiology
IS - 3 48-3
ER -