The neurofibromatosis type 1 (Nf1) tumor suppressor is a modifier of carcinogen-induced pigmentation and papilloma formation in C57BL/6 mice

被引:19
作者
Atit, RP
Mitchell, K
Nguyen, L
Warshawsky, D
Ratner, N
机构
[1] Univ Cincinnati, Coll Med, Dept Cell Biol Neurobiol & Anat, Cincinnati, OH 45267 USA
[2] Childrens Hosp Res Fdn, Div Mol & Dev Biol, Cincinnati, OH 45229 USA
[3] Univ Cincinnati, Coll Med, Dept Environm Hlth, Cincinnati, OH 45267 USA
关键词
carcinogenesis; keratinocyte; melanocyte; phorbol ester; Ras;
D O I
10.1046/j.1523-1747.2000.00994.x
中图分类号
R75 [皮肤病学与性病学];
学科分类号
100206 ;
摘要
There is increasing evidence implicating the human NF1 gene in epithelial carcinogenesis. To test if NF1 can play a part in skin tumor formation, we analyzed effects of the skin cancer initiator dimethylbenz-anthracene and/or the tumor promoter 12-O-tetradecanoyl-13-acetylphorbol on mice heterozygous for null mutations in Nf1 (Nf1+/-). Mice were on the C57BL/6 background, noted for resistance to chemical carcinogens. Nf1+/- mice (18 of 24) developed papillomas after treatment with dimethylbenzanthracene and 12-O-tetradecanoyl-13-acetylphorbol; papillomas did not develop in wild-type C57BL/6 mice nor Nf1+/- mice treated with 12-O-tetradecanoyl-13-acetylphorbol alone. All papillomas analyzed (six of six) had mutations in codon 61 of H-ras, demonstrating strong cooperation between the Nf1 GTPase activating protein for Ras, neurofibromin, and Ras-GTP. After exposure to 12-O-tetradecanoyl-13-acetylphorbol, Nf1+/- keratinocytes showed significant, sustained, increases in proliferation, implicating Nf1 in phorbol ester responsive pathways. Thus, Nf1 levels regulate the response of keratinocytes to 12-O-tetradecanoyl-13-acetylphorbol. Nf1+/- mice also showed a 2-fold increase in the development of pigmented skin patches stimulated by dimethylbenzanthracene; patches were characterized by hair follicles in anagen phase, implicating keratinocytes in the aberrant hyperpigmentation. Our results show that mutation in the Nf1 gene causes abnormal keratinocyte proliferation that can be revealed by environmental assaults such as carcinogen exposure. The data support a plausible role for NF1 mutation in human epithelial carcinogenesis.
引用
收藏
页码:1093 / 1100
页数:8
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