在培养的角质形成细胞和成纤维细胞中年龄与黑色素细胞刺激因子的相关性  

Correlation between age and the secretions of melanocyte-stimulating cytokines in cultured keratinocytes and fibroblasts

作　　者：OkazakiM. Yoshimura K. Uchida G. Harii K. 冯义国 

机构地区：[1]Department of Plastic and Reconstructive Surgery, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan

出　　处：《世界核心医学期刊文摘（皮肤病学分册）》2006年第3期46-47,共2页Digest of the World Core Medical JOurnals:Dermatology

摘　　要：Background: The majority of skin changes associated with ageing are caused by photoageing and reflect cumulative sun exposure. Although the actinic damage plays a major role in skin pigmentation, it is also important to examine the effects of chronological cellular ageing on the pigmentation. The chief cellular components of the skin other than melanocytes are keratinocytes and fibroblasts, and the influences of age-related changes in those cells on skin pigmentation have not been elucidated. Objective: To clarify the effects of cellular ageing of keratinocytes and fibroblasts on age-related skin pigmentation. Methods: Using ELISA analysis, we measured the level of melanogenic cytokines secreted by cultured keratinocytes and fibroblasts derived from skin of various chronological ages. We also compared the cytokine secretion by cultured keratinocytes between the second and fifth cultures. Results: There was no correlation between age and hepatocyte growth factor (HGF), stem cell factor (SCF), and basic fibroblast growth factor (b-FGF) secretion by fibroblasts. On the other hand, a significant positive correlation existed between age and interleukin ((IL)- 1α secretion (R2 = 0.50, P = 0.002), and a relatively weak correlation existed between age and endothelin- 1(ET- 1) secretion (R2 = 0.17,P = 0.051, not significant). The IL- 1α secretion by keratinocytes was significantly increased in the fifth cultures compared with the second cultures (P < 0.005). Conclusions: These findings suggest that IL- 1α secretion increases as cells grow older, and the increased secretion of IL- 1α by aged keratinocytes may stimulate HGF production in dermal fibroblasts paracrinely and ET- 1 production in keratinocytes autocrinely, which stimulates melanocyte proliferation and induces an increase of tyrosinase activity in melanocytes. Because IL- 1α is a primary mediator that responds to inflammation and injury, the transcription of genes involved in skin inflammation may be persistently induced in the aged skin. Thus the increased Background： The majority of skin c ageing are caused by photoageing sun exposure. Although the actinic hanges associated with and reflect cumulative damage plays a major role in skin pigmentation, it is also important to examine the effects of chronological cellular ageing on the pigmentation. The chief cellular components of the skin other than melanocytes are keratinocytes and fibroblasts, and the influences of age-related changes in those cells on skin pigmentation have not been elucidated. Objective： To clarify the effects of cellular ageing of keratinocytes and fibroblasts on age-related skin pigmentation. Methods： Using ELISA analysis, we measured the level of melanogenic cytokines secreted by cultured keratinocytes and fibroblasts derived from skin of various chronological ages.

关 键 词：角质形成细胞 细胞刺激因子 成纤维细胞 年龄相关性 黑色素生成 培养 皮肤色素沉着 皮肤改变 生理性老化 EUSA法 

分 类 号：R758.63[医药卫生—皮肤病学与性病学] R392.12[医药卫生—临床医学]