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- W2030289876 abstract "1. Up to 40% of female asthmatic subjects suffer a premenstrual deterioration in their condition which may be ameliorated by progesterone supplementation, although the mechanism responsible for this phenomenon is not understood. In vitro studies have shown that female sex-steroid hormones potentiate the bronchorelaxant effect of isoprenaline, whilst in vivo it has been shown that females exhibit greater sensitivity of systemic beta 2-adrenoceptor responses. 2. The aim of the present study was to determine whether cyclical alterations in beta 2-adrenoceptor expression, occurring under the influence of ovarian sex-steroid hormones, may offer an explanation for these findings. In vitro parameters of lymphocyte beta 2-adrenoceptor function were investigated in nine normal female subjects (aged 24 +/- 2 years) during the follicular (day 2-4) and luteal (day 21-23) phases of their menstrual cycle, and results were compared with those of nine age-matched healthy male controls studied at the same time intervals. 3. In female subjects there were significant increases in serum concentrations of oestradiol (3.3-fold) and progesterone (10.6-fold) between the follicular and luteal phases of the menstrual cycle, whereas no changes occurred in males. 4. In females during the luteal phase, the increase in sex-steroid hormones was mirrored by an increase in lymphocyte beta 2-adrenoceptor density (Bmax) and in maximal cyclic AMP response to isoprenaline (Emax), which were significantly higher than in male subjects. Mean differences (95% CI) between male and female subjects on visit 2 were 1.09 (0.49 to 1.69) fmol/10(6) cells (P = 0.001) for Bmax, and 3.42 (0.80 to 6.04) pmol/10(6) cells (P = 0.02) for Emax.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2030289876 date "1994-06-01" @default.
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- W2030289876 title "Influence of sex-steroid hormones on the regulation of lymphocyte beta 2-adrenoceptors during the menstrual cycle." @default.
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- W2030289876 doi "https://doi.org/10.1111/j.1365-2125.1994.tb04308.x" @default.
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