The present study was undertaken to determine a possible influence of fludarabine (fludarabine phosphate, F-ara-AMP) on the cell viability and count. The experiments were performed in vitro on human acute lymphoblastic MOLT-4 cells, human acute myeloblasts ML-1 cells, and human histiocytic lymphoma U-937 cells. The research was conducted using the spectrophotometric and Beckman Coulter methods. The cell viability was analyzed using MTT assay. The cell count was detected using an electronic Z2 Coulter counter. Temporary changes in the cell viability and count were assessed at 24h and 48h after F-ara-AMP application. The in vitro activity of fludarabine phosphate against MOLT-4, ML-1, and U-937 cells was compared. F-ara-AMP applied at the four concentrations - 250 nM, 500 nM, 750 nM, and 1 цМ - distinctly decreased the viability and count of the pathological hematopoietic cells. The effects of F-ara-AMP on MOLT-4, ML-1, and U-937 cells were dependent on the tested agent and its dose, the time intervals after the agent application, and the cell line used. ML-1 and U-937 cells appeared to be more resistant than MOLT-4 cells to the action of fludarabine phosphate. The in vitro response of the three human pathological hematopoietic cell lines to the F-ara-AMP action, was shown.
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