Abstract：
:Following exposure of mice to contact sensitizing chemicals, dendritic cells (DC) rapidly accumulate in the draining lymph nodes. A proportion, at least, of the DC which arrive in the nodes bear significant amounts of antigen and are derived from epidermal Langerhans' cells (LC). It is of interest that although LC are relatively inefficient antigen-presenting cells, the antigen-bearing DC found within draining nodes are potent accessory cells and induce immune responses both in vitro and in vivo. Previous in vitro studies have shown that during culture in the presence of granulocyte/macrophage colony-stimulating factor (GM-CSF), LC are subject to a functional and phenotypic maturation characterized by the development of effective accessory cell function and elevated membrane Ia antigen expression. We have hypothesized previously that LC may undergo a similar maturation in vivo as they move to the draining lymph nodes following receipt of the stimulus to migrate. As maturation in vitro is accompanied by increased Ia, we have examined the expression of this molecule on epidermal LC and lymph node DC during the induction phase of contact sensitization. The data reported provide evidence that peripheral lymph node DC, irrespective of whether they are derived from draining or resting nodes, and irrespective of whether or not they bear antigen, express comparable high levels of Ia antigen. In contrast, compared with DC, freshly isolated LC have considerably less (on average five times less) Ia antigen. These results indicate that during migration from the skin to lymphoid tissue LC are subject to a phenotypic maturation, comparable with that observed in vitro, and consistent with the acquisition of active antigen-presenting cell function.
journal_name
Immunologyjournal_title
Immunologyauthors
Cumberbatch M,Gould SJ,Peters SW,Kimber Isubject
Has Abstractpub_date
1991-11-01 00:00:00pages
414-9issue
3eissn
0019-2805issn
1365-2567journal_volume
74pub_type
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