Females were found to have a lower incidence of severe psoriasis. Female hormone estradiol suppresses psoriasis and plays a protective role in skin inflammation.
“Our results have revealed the molecular mechanisms of sex differences in psoriasis and shed new light on our understanding of the physiological role of estradiol,” says Hamamatsu University School of Medicine’s Tetsuya Honda, formerly of Kyoto University.
Estrogens Influence Female Itch
The team tested conditional knockout mice, or cko mice, with ovaries removed but supplemented with estradiol pellets or a placebo. In contrast to wild-type mice, the cko mice without the natural ovarian hormones estradiol showed symptoms of severe skin inflammation.
Once these mice were given estradiol, the production of IL-17A and IL-1β cytokines in neutrophil and macrophage immune cells was reversed, reducing the inflammation. This effect was also observed in human neutrophils in vitro.
What intrigued the researchers was how the lack of estrogen receptors in immune cells made estradiol ineffective against the cytokines.
“These results indicate that estradiol suppresses psoriatic inflammation by regulating neutrophil and macrophage cells,” concludes the author.
Source: Eurekalert
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