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  • Title: Combined low dose cyclosporine and prednisone down-regulate natural killer cell-like effector functions of CD8brightCD56+ T cells in patients with active Behçet uveitis.
    Author: Ahn JK, Park YG, Park SW, Yoon KC, Yu HG, Chung H.
    Journal: Ocul Immunol Inflamm; 2006 Oct; 14(5):267-75. PubMed ID: 17056460.
    Abstract:
    PURPOSE: To investigate the changes of effector-related phenotypic markers and the natural killer (NK)-like effector functions of CD8(bright)CD56+ T cells in patients with Behçet uveitis after combined cyclosporine and prednisone (Cs/Pd) treatment. METHODS: Ten patients with active Behçet panuveitis and 10 healthy controls were prospectively recruited in this study. The effector-related surface markers (CD27, CD62L, CD11b, HLA-DR, CD94, NKG2D), chemokine receptors (CXCR1, CXCR3, CCR4, CCR5), and intracellular perforin of circulating CD8(bright)CD56+ T cells were determined by flow cytometric analysis before and after two months' treatment. NK-like cytotoxicity of ex vivo CD8(bright)CD56+ T cells against K562 was measured by standard 51Cr release assay. RESULTS: The expression levels of effector-related molecules on CD8(bright)CD56+ T cells normalized after treatment. The expression levels of CXCR1 and CCR5 were down-regulated on CD8(bright)CD56+ T cells after treatment. The amounts of preformed intracellular perforin of CD8(bright)CD56+ T cells were reduced to the normal levels. Furthermore, the NK-like cytolytic capacities of CD8(bright)CD56+ T cells were decreased after treatment. CONCLUSIONS: Our results suggest that the combined Cs/Pd treatments in active Behçet uveitis may downregulate the NK-like effector functions of CD8(bright)CD56+ T cells.
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