Aspectual Comparison of the Skin Changes in Hairless Mice According to the Aging Type / 한국실험동물학회지

ABSTRACT

The purpose of this study was to compare the skin changes in female SKH-1 hairless mice between UVB irradiated photo-aged group and endogenous aged group. The UVB irradiation and endogenous aged groups showed poor skin conditions when compared with normal (N) group in terms of the skin erythema, water content and TEWL (transepidermal water loss). For the changes in gross observation and replica image analysis on wrinkle of the skin tissue, UVB irradiation group showed thicker, wider and deeper wrinkles than the changes seen in N group, whereas endogenous aged group showed thinner, narrower and shallower wrinkles than that of UVB irradiation group. In histopathological findings, UVB irradiation group and endogenous aged group showed thickened epidermis, increased dermal inflammatory cells, decreased collagen and elastic fiber content, increased number of degranulated dermal/subcutaneous mast cells, and lower expression quantity of TGF-beta in dermal layer when compared with N group, but to a lesser extent in aged group than the changes in UVB irradiation group. UVB irradiation group and endogenous aged group showed significantly higher xanthine oxidase activity, lower superoxide dismutase and catalase activities, and higher expression of MMP-3 mRNA in skin than N group. Therefore, aspectual comparison of the skin change in hairless mice between photo-aged and endogenous aged groups showed different each other, and these results will be useful for skin aging research.