Differentiated keratinocytes are responsible for TNF-α regulated production of macrophage inflammatory protein 3α/CCL20, a potent chemokine for Langerhans cells

被引:41
作者
Tohyama, M [1 ]
Shirakara, Y [1 ]
Yamasaki, K [1 ]
Sayama, K [1 ]
Hashimoto, K [1 ]
机构
[1] Ehime Univ, Sch Med, Dept Dermatol, Shigenobu, Ehime 7910295, Japan
关键词
MIP-3; alpha/CCL20; TNF-alpha; keratinocyte; Langerhans cell;
D O I
10.1016/S0923-1811(01)00127-X
中图分类号
R75 [皮肤病学与性病学];
学科分类号
100206 ;
摘要
The recruitment of immature dendritic cells into the epidermis is a key step in the development of cutaneous immunity, although the mechanism remains to be clarified. Recently, it was reported that both macrophage inflammatory protein 3 alpha (MIP-3 alpha)/CCL20 produced by keratinocytes and TNF-a are important in recruiting Langerhans cells (LC) to the epidermis. In this study, we examined the production of MIP-3a by human keratinocytes stimulated with TNF-alpha. Cultured keratinocytes showed enhanced expression of MIP-3 alpha mRNA and protein when stimulated with TNF-a. In addition, conditioned medium from TNF-a-stimulated keratinocyte cultures induced the migration of L1.2 cells expressing CCR6. We next examined the production of MIP-3a in stratified keratinocytes and found that, in contrast to non-stratified keratinocytes, stimulation with TNF-a increased the expression of MIP-3a mRNA and protein. Moreover, skin samples grown in organ culture and treated with TNF-a showed MIP-3a in the keratinocytes of the spinous layer, but not in the basal layer, by immunofluorescence staining. Based on these results, we postulate that MIP-3a produced by keratinocytes in the spinous layer in response to TNF-a stimulation is a key chemokine responsible for the epidermal recruitment of Langerhans cells. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.
引用
收藏
页码:130 / 139
页数:10
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