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- W1978214647 abstract "To characterize the mechanism(s) by which 1,25-dihydroxyvitamin D3 (calcitriol) modulates the costimulatory capacity of monocytes, we examined the effect of calcitriol pretreatment of monocytes on their capacity to promote T cell proliferation (accessory cell function). Correlation of calcitriol-dependent changes in monocyte accessory cell function and alterations in phenotype and cytokine production, and the dependence of these changes on cell viability, were studied. Calcitriol pretreatment induced a defect in accessory cell function that was evident with fixed monocytes, suggesting a cell-surface-associated mechanism. Altered accessory cell function did not correlate with changes in HLA-DR antigen expression and was unaffected by concurrent treatment with interferon-gamma. Calcitriol treatment did not alter either the expression of adhesion molecules or monocytic production of interleukin-1 beta (IL-1 beta) or IL-6. Exogenous IL-1 or IL-6 did not overcome the impaired costimulatory activity of calcitriol-treated monocytes. Thus, calcitriol treatment reduces the capacity of monocytes to promote lectin-induced T cell activation at the level of the plasma membrane, perhaps through altered expression of an uncharacterized molecule important in monocyte-T cell interactions. At chronically inflamed sites, elaboration of calcitriol by activated macrophages may regulate the ability of monocytes to induce both antigen-dependent and antigen-independent T cell proliferation." @default.
- W1978214647 created "2016-06-24" @default.
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- W1978214647 date "1992-01-01" @default.
- W1978214647 modified "2023-10-02" @default.
- W1978214647 title "Decreased Accessory Cell Function and Costimulatory Activity BY 1, 25-Dihydroxyvitamin D3—Treated Monocytes" @default.
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- W1978214647 doi "https://doi.org/10.1002/art.1780350117" @default.
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