Chronic ultraviolet B radiation-induced biochemical changes in the skin of hairless mice.
Skh:HR-1 hairless mice were irradiated chronically with sub-erythemal doses of UVB radiation, and a number of biochemical parameters in the skin were determined after 6, 12, 18, and 24 wk of exposure. The parameters measured were water, collagen, elastin, and glycosaminoglycan content; collagenase and elastase levels; and Bz-Tyr-OEt (N-benzoyl-L-tyrosine ethyl ester) and BAPNA (alpha-N-benzoyl-DL-arginine-p-nitroanilide) hydrolyzing activities. Data for UVB radiation-exposed and chronological age-matched control mice were compared with respect to unit area and to unit mass of skin. On a unit area of skin basis, UVB radiation exposure increased the level of most parameters. The particular exceptions were collagen and collagenase which remained constant. On a mass of skin basis, though, there is an apparent decrease in collagen content because of the increase in the other skin components. This suggests that there is insufficient collagen in UVB radiation-exposed skin to support the increasing mass of the tissue.
Chatterjee
R
R
Procter & Gamble Co., Miami Valley Laboratories, Cincinnati, OH 45239-8707.
Benzinger
M J
MJ
Ritter
J L
JL
Bissett
D L
DL
D000818:Animals; D001120:Arginine / Q000031:analogs & derivatives / Q000378:metabolism; D001586:Benzoylarginine Nitroanilide; D001834:Body Water / Q000378:metabolism; D003094:Collagen / Q000378:metabolism; D004549:Elastin / Q000378:metabolism; D005260:Female; D006025:Glycosaminoglycans / Q000378:metabolism; D006868:Hydrolysis; D051379:Mice; D008812:Mice, Hairless; D003012:Microbial Collagenase / Q000378:metabolism; D010196:Pancreatic Elastase / Q000378:metabolism; D010447:Peptide Hydrolases / Q000378:metabolism; D012867:Skin / Q000378:metabolism / Q000528:radiation effects*; D015595:Skin Aging / Q000528:radiation effects; D014443:Tyrosine / Q000031:analogs & derivatives / Q000378:metabolism; D014466:Ultraviolet Rays
D006025:Glycosaminoglycans; C006716:benzoyltyrosine ethyl ester; D014443:Tyrosine; D003094:Collagen; D004549:Elastin; D001586:Benzoylarginine Nitroanilide; D001120:Arginine; D010447:Peptide Hydrolases; D010196:Pancreatic Elastase; D003012:Microbial Collagenase