Abstract
Leukemia cell lines were treated with eltrombopag or thrombopoietin and their proliferative response was determined. Eltrombopag did not increase proliferation of cell lines that did not express high levels of megakaryocyte markers. Instead, treatment with eltrombopag alone inhibited proliferation of many cell lines (IC 50 range = 0.56–21 μg/mL). The addition of other cytokines, such as G-CSF, Epo or Tpo, did not affect the decrease in proliferation. The decrease in proliferation appears to be through a TpoR-independent, nonapoptotic mechanism. These findings suggest that eltrombopag does not enhance, but rather inhibits, proliferation of leukemia cell lines in vitro.
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