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Deprecated: Implicit conversion from float 278.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Immunology 2015 ; 146 (3): 423-31 Nephropedia Template TP
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1?,25-dihydroxyvitamin D3 acts via transforming growth factor-? to up-regulate expression of immunosuppressive CD73 on human CD4+ Foxp3? T cells #MMPMID26251265
Mann EH; Chambers ES; Chen YH; Richards DF; Hawrylowicz CM
Immunology 2015[Nov]; 146 (3): 423-31 PMID26251265show ga
Vitamin D deficiency is associated with increased incidence and severity of various immune-mediated diseases. Active vitamin D (1?,25-dihydroxyvitamin D3; 1,25(OH)2D3) up-regulates CD4+ T-cell expression of the purine ectonucleotidase CD39, a molecule that is associated with the generation of anti-inflammatory adenosine. Here we aimed to investigate the direct impact of 1,25(OH)2D3 on expression of the downstream ecto-5?-nucleotidase CD73 by human CD4 T cells, and components of the transforming growth factor-? (TGF-?) pathway, which have been implicated in the modulation of CD73 by murine T cells. At 10?8 to 10?7m, 1,25(OH)2D3 significantly increased expression of CD73 on peripheral human CD4+ T cells. Although 1,25(OH)2D3 did not affect the mRNA expression of latent TGF-?1, 1,25(OH)2D3 did up-regulate expression of TGF-?-associated molecules [latency-associated peptide (LAP), glycophorin A repetitions predominant (GARP), GP96, neuropilin-1, thrombospondin-1 and ?v integrin] which is likely to have contributed to the observed enhancement in TGF-? bioactivity. CD73 was highly co-expressed with LAP and GARP following 1,25(OH)2D3 treatment, but unexpectedly, each of these cell surface molecules was expressed primarily on CD4+ Foxp3? T cells, rather than CD4+ Foxp3+ T cells. Notably, neutralization of TGF-? significantly impaired 1,25(OH)2D3-mediated induction of CD73. Collectively, we show that 1,25(OH)2D3 enhances expression of CD73 on CD4+ Foxp3? T cells in a process that is at least partially TGF-?-dependent. These data reveal an additional contributing mechanism by which vitamin D may be protective in immune-mediated disease.