title: Effect of β-agonist on the dexamethasone-induced expression of aromatase by the human monocyte cells.
abstract: Emerging evidence suggests that sex steroids are important for human skin health. In particular, estrogen improves skin thickness, elasticity and moisture of older women. The major source of circulating estrogen is the ovary; however, local estrogen synthesis and secretion have important roles in, for example, bone metabolism and breast cancer development. We hypothesized that infiltrated peripheral monocytes are one of the sources of estrogen in skin tissues. We also hypothesized that, during atopic dermatitis under stress, a decline in the hypothalamus-pituitary-adrenal axis (HPA) and facilitation of the (hypothalamus)-sympathetic-adrenomedullary system (SAM) attenuates estrogen secretion from monocytes. Based on this hypothesis, we tested aromatase expression in the human peripheral monocyte-derived cell line THP-1 in response to the synthetic glucocorticoid dexamethasone (Dex), the synthetic β-agonist isoproterenol (Iso) and the β-antagonist propranolol (Pro). Dex mimics glucocorticoid secreted during excitation of the HPA, and Iso mimics catecholamine secreted during excitation of the SAM. We found that aromatase activity and theCYP19A1gene transcript were both upregulated in THP-1 cells in the presence of Dex. Addition of Iso induced their downregulation and further addition of Pro rescued aromatase expression. These results may suggest that attenuation of estrogen secretion from peripheral monocytes could be a part of the pathology of stress-caused deterioration of atopic dermatitis. Further examination using anin vitrohuman skin model including THP-1 cells might be a valuable tool for investigating the therapeutic efficacy and mechanism of estrogen treatment for skin health.
authors.affiliation: Laboratory of Tissue RegenerationHoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa, Tokyo, Japan masatada@hoshi.ac.jp.
authors.forename: Masatada
authors.initials: M
authors.lastname: Watanabe
authors.affiliation: Division of Research for Pharmacy Students EducationHoshi University, Shinagawa, Tokyo, Japan.
authors.forename: Shuji
authors.initials: S
authors.lastname: Ohno
authors.affiliation: Laboratory of Tissue RegenerationHoshi University School of Pharmacy and Pharmaceutical Sciences, Shinagawa, Tokyo, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Wachi
keywords: aromatase; atopic dermatitis; estrogen; monocyte; β-agonist