title: The characteristics of aromatase deficient hairless mice indicate important roles of extragonadal estrogen in the skin.
abstract: The roles of extragonadal estrogen in the skin are poorly understood, due to the lack of proper animal models. We examined the skin phenotypes of aromatase-knockout hairless (ArKO) mice and wild-type hairless (WT) mice, both of which were obtained through crossbreeding of Ar+/- mice and hairless mice. Differences in the skins of ArKO and WT mice were compared with those of ovariectomized (OVX) and control (Sham) mice. A difference was observed in the skin tone of ArKO mice, which is pale white and differs from the pinkish tone of all other mice. However, both ArKO and OVX mice similarly exhibited deteriorations of skin properties as compared to their respective controls. Furthermore, all the deteriorations were similarly amplified by chronic UVB irradiation in both ArKO and OVX mice as compared to their respective controls. The unique skin phenotype of ArKO mice was observed in sunburn reactions. Specifically, skins of ArKO mice showed no reaction after an acute UVB irradiation at dose intensities caused sunburn in others. However, follow-up observation found delayed reactions associated with brownish skin color and swelling only in ArKO mice, thereby suggesting that the role of extragonadal estrogen may be connected with the protective reactions of skin.
authors.affiliation: Biological Science Laboratories, Kao Corporation, Ichikai, Haga, Tochigi, Japan.
authors.forename: Kazue
authors.initials: K
authors.lastname: Tsukahara
authors.forename: Shingo
authors.initials: S
authors.lastname: Kakuo
authors.forename: Shigeru
authors.initials: S
authors.lastname: Moriwaki
authors.forename: Mitsuyuki
authors.initials: M
authors.lastname: Hotta
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ohuchi
authors.forename: Takashi
authors.initials: T
authors.lastname: Kitahara
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Harada
mesh_terms: D000818:Animals; D001141:Aromatase / Q000235:genetics*; D001835:Body Weight / Q000235:genetics; D004548:Elasticity / Q000528:radiation effects; D004890:Erythema / Q000209:etiology; D004967:Estrogens / Q000378:metabolism* / Q000502:physiology*; D005260:Female; D005712:Galvanic Skin Response / Q000235:genetics / Q000528:radiation effects; D006066:Gonads / Q000378:metabolism; D008297:Male; D051379:Mice; D008812:Mice, Hairless; D018345:Mice, Knockout; D010052:Ovariectomy; D011829:Radiation Dosage; D012867:Skin / Q000201:enzymology / Q000378:metabolism*; D015595:Skin Aging / Q000235:genetics* / Q000528:radiation effects; D012880:Skin Pigmentation / Q000235:genetics / Q000528:radiation effects; D014466:Ultraviolet Rays / Q000009:adverse effects; D014870:Water Loss, Insensible / Q000235:genetics / Q000528:radiation effects
chemical_list: D004967:Estrogens; D001141:Aromatase