SUPPRESSION OF ANTICANDIDA ACTIVITY OF MURINE NEUTROPHILS BY PROGESTERONE IN-VITRO - A POSSIBLE MECHANISM IN PREGNANT WOMENS VULNERABILITY TO VAGINAL CANDIDIASIS

Sex steroid hormones were examined for their effect on mycelial growth of Candida albicans, and the inhibitory activity of casein-induced mu rine peritoneal neutrophils against mycelial growth of C. albicans was examined in vitro using a crystal violet staining method or a [H-3]gl ucose incorporation method. Four steroid hormones, danazol, estradiol, estriol and testosterone had no effect on mycelial growth of C. albic ans, but progesterone appeared to convert the growth form of C. albica ns from hyphal to yeast, Danazol (10(-6) M) and progesterone (10(-5) M ) suppressed anti-Candida activity of neutrophils of nontreated mice, while testosterone, estradiol, and estriol did not. The anti-Candida a ctivity of neutrophils of estradiol pretreated mice was clearly suppre ssed by progesterone even at 10(-6) M which corresponded to its plasma concentration in pregnant women in the third trimester. The physiolog ical significance of this suppressive effect of progesterone was discu ssed in relation to the vulnerability of pregnant women to vaginal can didiasis.