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International Immunology, Vol. 11, No. 8, 1217-1224, August 1999
© 1999 Japanese Society for Immunology

Glucocorticoid-mediated regulation of thymic dendritic cell function

Rosa Sacedón, Angeles Vicente1, Alberto Varas, Eva Jiménez, Juan José Muñoz and Agustín G. Zapata

Department of Cell Biology, Faculty of Biology, and
1 Department of Cell Biology, Faculty of Medicine, Complutense University, 28040 Madrid, Spain

Correspondence to: A. G. Zapata

The possible effects of glucocorticoids (GC) on the biology of thymic dendritic cells (DC) have been analyzed. Both DC and GC seem to be involved in intrathymic T cell selection but possible relationships, if any, between them remain currently unknown. For the first time, we have proved the expression of GC receptors in thymic DC. Moreover, our data demonstrate that in vitro dexamethasone (Dex) treatment barely affects the viability of mature thymic DC, which are largely resistant to its apoptotic effect. Dex-treated thymic DC also show a slightly reduced surface expression of some adhesion and co-stimulatory molecules in correlation with diminished allostimulatory properties. Furthermore, the production of both IL-1ß and tumor necrosis factor (TNF)-{alpha}, but not that of IL-6 and IL-10, diminished in the mixed leukocyte reaction established with Dex-treated thymic DC. However, the addition of recombinant rat IL-1ß and TNF-{alpha}, alone or in combination, did not recover the allostimulatory capacity. Taken together, these results support certain GC-mediated regulation of the activity of thymic DC which could be relevant for the biology of the thymus gland.

Keywords: dendritic cells, glucocorticoids, thymus

Transmitting editor: K. Arai


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