TLR4-induced B7-H1 on keratinocytes negatively regulates CD4+ T cells and CD8+ T cells responses in oral lichen planus

Abstract

Oral lichen planus (OLP) is a T-cell-mediated autoimmune mucocutaneous disease affected by the interactions among the keratinocytes, CD4⁺ T cells and CD8⁺ T cells. B7-H1 induced by Toll-like receptors (TLRs), can suppress T cell immune reaction, thereby resulting in immune tolerance. However, the role of TLRs-mediated B7-H1 on keratinocytes in the immune response of OLP is still unknown. The present study showed that TLR4 could induce time-coursed B7-H1 expression on oral keratinocytes, and blocking NF-κB or PI3K/mTOR pathway down-regulated B7-H1 transcriptional expression. Moreover, TLR4-stimulated oral keratinocytes inhibited the proliferation of OLP CD4⁺ T cells and OLP CD8⁺ T cells, and simultaneously prompted their apoptosis. Blockade of keratinocytes-associated B7-H1 restored the declined proliferation of OLP CD4⁺ T cells and OLP CD8⁺ T cells, and prevented their increased apoptosis. Therefore, TLR4-upregulated B7-H1 on keratinocytes could decelerate immune responses of CD4⁺ T cells and CD8⁺ T cells in OLP.

This article is protected by copyright. All rights reserved.

http://ift.tt/2e3xlra