REGIONAL-DEVELOPMENT OF LANGERHANS CELLS AND FORMATION OF BIRBECK GRANULES IN HUMAN EMBRYONIC AND FETAL SKIN

被引:21
作者
FUJITA, M [1 ]
FURUKAWA, F [1 ]
HORIGUCHI, Y [1 ]
UEDA, M [1 ]
KASHIHARASAWAMI, M [1 ]
IMAMURA, S [1 ]
机构
[1] KYOTO UNIV,INST VIRUS RES,DEPT PATHOL,KYOTO 606,JAPAN
关键词
D O I
10.1111/1523-1747.ep12478115
中图分类号
R75 [皮肤病学与性病学];
学科分类号
100206 ;
摘要
The regional development of Langerhans cells (LC) and the formation of Birbeck granules (BG) were examined in human embryonic and fetal skin. Samples were obtained from multiple anatomic sites and stained with anti-CD36, anti-CD 1a, and anti-HLA-DR antibody as well as Lag antibody specifically reactive to BG and some vacuoles of human LC. In the first trimester, CD36+ dendritic epidermal cells were identified before the appearance of CD1a+ cells and Lag+ cells. Some of the former co-expressed HLA-DR antigens but not CD1a antigens. In the second trimester, regional variations in LC development were observed. Epidermal LC of palms and soles reached a peak in number in the first trimester but were rarely detected after 18 weeks estimated gestation age (EGA), whereas, in other regions, their number increased with age. In the second trimester, CD1a+ cells and Lag+ cells were also identified in the epidermis, although Lag+ cells appeared later than CD1a+ cells. The Lag+ cells until 17 weeks EGA showed a variety of staining intensities and immunoelectron microscopy revealed that they contained various amounts of Lag-reactive BG. Flow cytometric analysis showed that relative amounts of Lag antigens in LC increased during the second trimester and that fetal LC of 18 weeks EGA expressed the same amounts of HLA-DR, CD1a, and Lag antigens as did adult human LC. In the dermis, in the second trimester, numerous CD36+ cells and HLA-DR+ cells were found, whereas CD1a+ cells and Lag+ cells were rarely detected. Taken together, it is suggested that HLA-DR+ dendritic cells acquire CD1a+ antigens first and then form BG after migration to the epidermis and that fetal LC are phenotypically mature in the second trimester.
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页码:65 / 72
页数:8
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