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Reduced cytokine-mediated up-regulation of HLA-DR in TAP-deficient fibroblasts by Jacques Zimmer; Aurélie Poli; Emmanuel Andrès; Daniel Hanau; Nicolaas H.C. Brons; François Hentges is a Immunology and Microbiology article available to read on EtoBox.

What is Reduced cytokine-mediated up-regulation of HLA-DR in TAP-deficient fibroblasts about?

Human deficiency in transporter associated with antigen processing (TAP) is characterized by a very low surface expression of human leukocyte antigen (HLA) class I molecules in hematopoietic and non hematopoietic cells. Among the latter, TAP-deficient skin fibroblasts have previously been shown by us to be very sensitive to lysis by activated autologous NK cells, even in the presence of cytokines that up-regulate HLA class I expression, a mechanism sufficient to protect normal fibroblasts from NK cell-mediated killing. Our complementary investigations on two TAP-deficient skin fibroblast cell lines surprisingly revealed that in response to proinflammatory cytokines, up-regulation of HLA-DR molecules at the cell surface is much less marked than in the case of normal skin fibroblasts. In contrast, the surface molecules CD40 and CD54 increase as much as observed on normal cells, suggesting that TAP-deficient fibroblasts are able to efficiently transduce cytokine-mediated stimulating signals. Transfection of an intact TAP gene into one of the TAP-deficient fibroblast cell lines restored a normal HLA class I expression that strongly increased upon IFN-gamma-mediated stimulation, whereas

Who reads Reduced cytokine-mediated up-regulation of HLA-DR in TAP-deficient fibroblasts?

Author

Jacques Zimmer; Aurélie Poli; Emmanuel Andrès; Daniel Hanau; Nicolaas H.C. Brons; François Hentges

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0165-2478)

Published

2006

Language

EN

Field

Immunology and Microbiology (Life Sciences)