Gene expression profiles in dendritic cells conditioned by 1alpha,25-dihydroxyvitamin D3 analog

The Journal of Steroid Biochemistry and Molecular Biology
Matthew D GriffinRajiv Kumar

Abstract

Inhibition of dendritic cell (DC) maturity is an important immunomodulatory effect of 1alpha,25-dihydroxyvitamin D(3) (1alpha,25(OH)(2)D(3)) and related analogs (D(3) analogs). The mechanisms underlying 1alpha,25(OH)(2)D(3)-mediated DC modulation are Vitamin D receptor (VDR)-dependent and likely involve direct or indirect regulation of multiple genes. Gene expression profiles of bone marrow-derived DCs (BMDCs) generated in the absence or presence of a potent D(3) analog were analyzed using microarray technology. Results for D(3) analog-conditioned DCs were also compared with glucocorticoid-conditioned BMDCs and with BMDCs conditioned with D(3) analog and glucocorticoid combined. Of approximately 12,000 gene products assayed, 52% were considered to have detectable expression in unconditioned BMDCs. Based on relative expression levels, 5.3% of these expressed genes were "silenced" or "suppressed" in D(3) analog-conditioned BMDCs and 2.1% were "augmented". In addition, 1.7% of gene products undetectable in control BMDCs were "induced" by D(3) analog. Functional grouping of modulated genes demonstrated important effects of D(3) analog on immunoreceptors, on chemokines and chemokine receptors, on growth factors/cytokines and related...Continue Reading

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