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- W1548769928 abstract "We investigated whether phorbol-12-acetate-13-myristate (PMA)-activated human polymorphonuclear leukocytes (PMNs) induce base modifications in target cell DNA in vivo. Human PMNs produced 9.4 +/- 0.8 (SD) nmol of H2O2/10(6) cells during 50 min of exposure to 2 micrograms/ml PMA and 13.7 +/- 2.8 nmol/10(6) cells during exposure to PMA plus 5 mM NaN3. Neither nonstimulated PMNs, nor PMA alone, nor NaN3 alone induced base modifications in chromatin-associated DNA of human Ad293 cells above control levels, when assayed by gas chromatography/mass spectrometry with selected-ion monitoring. However, a 60-min exposure to 1.7 +/- 0.4 x 10(6) PMNs/ml in the presence of 2 micrograms/ml PMA induced a 2-3-fold increase in the level of all modified bases detected by gas chromatography/mass spectrometry with selected-ion monitoring. The guanine-derived products 8-hydroxyguanine and 2,6-diamino-4-hydroxy-5-formamidopyrimidine, and the adenine-derived product 4,6-diamino-5-formamidopyrimidine were induced to the highest levels among those bases detected. These data demonstrate that exposure to activated PMNs causes DNA base modifications in target cells in vivo typical of those induced by hydroxyl radical attack. The induction of potentially promutagenic modified bases may contribute to the mutagenicity of activated PMNs." @default.
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- W1548769928 date "1993-03-15" @default.
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- W1548769928 title "Modification of DNA bases in chromatin of intact target human cells by activated human polymorphonuclear leukocytes." @default.
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