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- W2079715199 abstract "The immunosuppressant sirolimus and curcumin, the main principle of the turmeric spice, have shown antiproliferative effects on many human and not-human cell lines. Whereas the antiproliferative effect of sirolimus is mainly mediated by inhibition of mTOR, curcumin is described to affect many molecular targets which makes it unpredictable to appraise if the effects of these both substances on cell proliferation and especially on immunosuppression are additive or synergistic. To answer this question we investigated the interaction of both these substances on OKT3-induced human peripheral blood mononuclear cell (PBMC) proliferation. OKT3-induced human PBMC proliferation was determined by measuring 3H-thymidine incorporation. Influence of curcumin on interleukin-2 (IL-2) release and IκB-phosphorylation in PBMC was determined by ELISA and western blot, respectively. Curcumin-induced apoptosis and necrosis was analyzed by FACS analysis. Whereas curcumin completely inhibited OKT3-induced PBMC proliferation in a dose-dependent manner with an IC50 of 2.8 μM, sirolimus could reduce PBMC proliferation dose-dependently only to a minimum of 28% at a concentration of 5 ng/ml (IC50 1.1 ng/ml). When curcumin was combined at concentrations of 1.25–2.5 μM with sirolimus at concentrations from 0.63 to 1.25 ng/ml the effects were synergistic. Combination of curcumin (1.25–2.5 μM) with sirolimus (5 ng/ml) showed additive effects. The effects after combination of curcumin at 5 μM with each sirolimus concentration and sirolimus at 10 ng/ml with each curcumin concentration were presumably antagonistic. We conclude that the immunosuppressive effects of curcumin and sirolimus in low concentrations are synergistic in OKT3-activated PBMC. Whether curcumin and sirolimus have also synergistic antiproliferative effects in tumor cells has to be shown in further experiments including animal models." @default.
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- W2079715199 date "2013-01-01" @default.
- W2079715199 modified "2023-09-27" @default.
- W2079715199 title "Synergistic immunosuppressive effects of the mTOR inhibitor sirolimus and the phytochemical curcumin" @default.
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- W2079715199 doi "https://doi.org/10.1016/j.phymed.2012.09.018" @default.
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