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PARP activation was indicated by the appearance of polyADP\u2010ribose, the incorporation of P32\u2010labelled NADH, and by cellular NADH. EGFR\u2010ERK signaling was manipulated through ligand activation or signal interruption using the tyrphostin AG1478, or MEK inhibitor PD 184352. EGF activation of ERK prior to irradiation was associated with a marked increase in PARP activation and decreased survival in both cell lines. Prior inactivation of PARP protected both cell lines from the initial decrease in NAD+ and improved the survival of LNCaP cells following combined EGF and IR treatment. MEK inhibitor PD 184352 also reduced PARP activation and improved LNCaP survival following EGF and IR treatment. These data imply that PARP activation following exposure to ionizing radiation is enhanced through EGFR\u2010ERK signaling. J. Cell. 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