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  • Title: Arsenic trioxide decreases the amount and inhibits the function of regulatory T cells, which may contribute to its efficacy in the treatment of acute promyelocytic leukemia.
    Author: Xu W, Li X, Quan L, Yao J, Mu G, Guo J, Wang Y.
    Journal: Leuk Lymphoma; 2018 Mar; 59(3):650-659. PubMed ID: 28679299.
    Abstract:
    Arsenic trioxide (ATO) exhibits substantial clinical efficacy in the treatment of acute promyelocytic leukemia (APL). Here, we investigated whether ATO exerts its efficacy by affecting regulatory T (Treg) cells. We determined whether ATO treatment influenced the amount and function of purified Treg cells. We also examined the effect of ATO treatment on Treg cells from APL patients. ATO treatment induced apoptosis in purified Treg cells and dampened the inhibition of effector T (Teff) cells proliferation and the secretion of cytokine by Treg cells. Treg cell levels in the peripheral blood and serum IL-10 levels were dramatically decreased in APL patients after single ATO treatment. In summary, our results show that ATO decreases the amount and inhibits the function of Treg cells, thereby enhancing Teff cell function and overall anti-tumor immunity.
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