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Low-dose cyclophosphamide combined with IL-2 inhibits tumor growth by decreasing regulatory T cells and increasing CD8+ T cells and natural killer cells in mice.

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Interleukin-2 (IL-2) benefits some cancer patients by promoting the proliferation of cytotoxic effector T cells, but this process is limited by the expansion of regulatory T cells (Tregs). Low-dose cyclophosphamide… Click to show full abstract

Interleukin-2 (IL-2) benefits some cancer patients by promoting the proliferation of cytotoxic effector T cells, but this process is limited by the expansion of regulatory T cells (Tregs). Low-dose cyclophosphamide (CTX) can inhibit the number and function of Tregs. We treated carcinoma-bearing mice with Vehicle, CTX, IL-2 and CTX + IL-2 to investigate the effects of low-dose CTX combined with IL-2 in antitumor treatment. In comparison to monotherapy, CTX + IL-2 significantly limited tumor growth, via tumor cell proliferation inhibition and increased apoptosis. The infiltration of CD8+ T cells in tumor tissues was significantly increased in the CTX + IL-2 group. CTX + IL-2 safely increased CD8+ T and natural killer cells in the spleen, lymph nodes and peripheral blood, and CTX attenuated the increase in Tregs induced by IL-2 in the spleen.

Keywords: ctx; tumor growth; tumor; low dose; regulatory cells; dose cyclophosphamide

Journal Title: Immunobiology
Year Published: 2022

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