Abstract
Docetaxel is an antineoplastic taxoid that interferes with microtubule polymerization dynamics and is used clinically to treat advanced cancers. Because microtubules play significant roles in T lymphocyte activation and function we characterized the in vitro immunomodulatory properties of docetaxel. Effects of docetaxel on lectin-induced peripheral blood mononuclear cell (PBMC) proliferation were measured by the 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) assay and proliferating cell nuclear antigen (PCNA) staining. In addition, apoptosis was measured by annexin V staining and cell activation by determination of CD25 and CD71 cell surface expression. Intracellular calcium kinetics in lectin-activated Jurkat T lymphocytes exposed to docetaxel were investigated. Th1 cytokine production was assessed in T lymphocytes by intracellular cytokine staining. Docetaxel significantly inhibited PBMC proliferation and promoted apoptosis of lectin-activated PBMCs. Docetaxel significantly decreased expression of CD71 but not that of CD25. Docetaxel altered intracellular calcium homeostasis but did not affect Th1 cytokine production in T lymphocytes. In conclusion we demonstrate that docetaxel, although exerting significant antiproliferative effects on lymphocytes and promoting activation-induced apoptosis does affect only partially lymphocyte activation and function and does not affect Th1 cytokine production. These results suggest maintenance of lymphocyte functions important for host tumor surveillance and suggest that this compound may have a role in the treatment of cancer arising organ transplant recipients.
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Si, MS., Imagawa, D.K., Ji, P. et al. Immunomodulatory effects of docetaxel on human lymphocytes. Invest New Drugs 21, 281–290 (2003). https://doi.org/10.1023/A:1025408425660
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DOI: https://doi.org/10.1023/A:1025408425660