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Effects of ultraviolet irradiation on human skin-derived epidermal cells in vitro

✍ Scribed by N. S. Dissanayake; G. E. Greenoak; R. S. Mason

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
818 KB
Volume
157
Category
Article
ISSN
0021-9541

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✦ Synopsis

The effects of UVA, mixed UVA + B, and solar-simulated irradiation were examined in human keratinocytes and melanocytes cultured in vitro. Irradiation with UVA, UVA + B, or the solar simulator caused a dose-dependent decrease in keratinocyte cell numbers and thymidine incorporation at 24 hours, with recovery after 48 and 72 hours. Divided dose regimens reduced the inhibitory effect of ultraviolet (UV) irradiation o n cell numbers measured 24 hours after the last irradiation. Exposure to both UVA and UVA + B increased formation of cornified envelopes. Similar irradiance doses of UVA 80 minutes (1.12 J/cm7) and UVA + B 40 minutes (1.04 J/cm*) caused 2.4-and 3.3-fold increases in cornified envelope formation, respectively. With solar-simulated irradiation, the cornified envelope formation was increased by 3.5-fold after exposure of 8 minutes (2.6 Jicm').

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