CHARACTERIZATION, EXPRESSION, AND IMMUNOHISTOCHEMICAL LOCALIZATION OF 5-ALPHA-REDUCTASE IN HUMAN SKIN

被引:104
作者
LUUTHE, V [1 ]
SUGIMOTO, Y [1 ]
PUY, L [1 ]
LABRIE, Y [1 ]
SOLACHE, IL [1 ]
SINGH, M [1 ]
LABRIE, F [1 ]
机构
[1] UNIV LAVAL, QUEBEC CITY, PQ, CANADA
基金
英国医学研究理事会;
关键词
5-ALPHA-REDUCTASE; STEROIDOGENESIS; SKIN; CLONING; IMMUNOHISTOCHEMISTRY EXPRESSION; ENDOCRINOLOGY;
D O I
10.1111/1523-1747.ep12371766
中图分类号
R75 [皮肤病学与性病学];
学科分类号
100206 ;
摘要
Human skin has been shown to contain a high level of 5 alpha-reductase activity, the enzyme that catalyses the conversion of the weak androgen testosterone into dihydrotestosterone, the most potent androgen. Because two types of 5 alpha-reductase genes have been characterized in humans, we have cloned 5 alpha-reductase cDNAs from adult human keratinocyte and skin fibroblast cDNA libraries to identify and gain better knowledge of the 5 alpha-reductase expressed in normal human skin. Nucleotide sequence analysis shows that the clones obtained correspond to the type I 5 alpha-reductase. RNase protection analysis using (poly A)(+) RNA obtained from human skin and prostate also confirms that type I 5 alpha-reductase is the predominant type expressed in normal skin, whereas type II 5 alpha-reductase is the major form found in the prostate. Following polymerase chain reaction amplification of human keratinocyte and skin fibroblast cDNA, a low level of type II 5 alpha-reductase cDNA has been detected. Using antipeptide antibodies raised in rabbits against the peptide sequence covering amino acids 227 - 240 to perform immunohistochemical localization of 5 alpha-reductase, we have found that 5 alpha-reductase is distributed in sweat and sebaceous glands, as well as in the epidermal cell layers, thus providing the basis for the important role of androgens in human skin and its appendages.
引用
收藏
页码:221 / 226
页数:6
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