Abstract
We show that prolonged exposure of non-Hodgkin's lymphoma (NHL) cell lines to low doses of the Src family protein tyrosine kinases (SFKs) inhibitor SU6656 caused proliferation abrogation as a result of the formation of cells with single multilobed nuclei and several mitotic spindle poles, features similar to polyploid megakaryocytes. The propensity of the NHL B cells tested to undergo polyploid was unrelated to the presence of p53 mutations in these cells since comparable outcomes were observed in SU6656-exposed cultures of blood B lymphocytes derived from healthy individuals. Thus, in addition to its utility for the study of megakaryocyte polyploidization, our results show that SU6656 can also induce polyploidy in cells of lymphoid origin, revealing a chemotherapeutic potential for this inhibitor to limit tumor propagation of malignant B cell lymphomas, although not without affecting normal B cells as well.
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