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The mechanism of 5-fluorouracil (5-FU) and 5-fluorodeoxyuridine (FdUR)-induced death of mouse mammary tumor FM3A cells was studied. When the cells were exposed to 5-FU or FdUR, an unbalance of intracellular dNTP pool resulted. The unbalance was followed by breakage of mature DNA. DNA double strand breaks were observed in the FdUR (1 microM) treated cells 16 hrs after the administration. We assume that the double strand breaks play an important role in the mechanism of the FdUR-mediated cell death. In addition, the activity that can induce DNA double strand breaks was detected in the lysate of FdUR treated FM3A cells. Since intracellular dNTP pool unbalance seems to be the trigger of these events, this phenomenon may be termed as dNTP-unbalanced cell death.
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