PMID: 8448347Jan 1, 1993Paper

Enhancement by L-histidine of nickel(II)-induced DNA-protein cross-linking and oxidative DNA base damage in the rat kidney

Chemical Research in Toxicology
M MisraK S Kasprzak

Abstract

Formation of DNA-protein cross-links and oxidatively damaged DNA bases was investigated with the use of alkaline elution and gas chromatography/mass spectrometry techniques in the nuclei from kidneys of rats 3 and 18 h after a single iv injection of the NiII(His)2 complex (NiHis), nickel(II) acetate (NiAcet), or L-histidine (His). Administration of 20 mumol of NiHis/kg body wt caused the formation of DNA-protein cross-links and significantly increased levels of oxidatively damaged DNA bases, including 2,6-diamino-4-hydroxy-5-formamidopyrimidine (FapyGua; 3.5-fold vs the control value) 3 h postinjection and 8-oxoguanine (2.6-fold), cytosine glycol (2.5-fold), 8-oxoadenine (2-fold), and FapyGua (1.9-fold) 18 h postinjection. Injection of 20 mumol of NiAcet/kg body wt enhanced the cross-linking to a lesser extent than NiHis and did not significantly increase the amounts of modified DNA bases over the control levels. Forty micromoles of His per kilogram body wt alone caused a marked DNA-protein cross-linking effect and increased the amount of 4,6-diamino-5-formamidopyrimidine (2-fold vs the control) 3 h, but not 18 h, after treatment. The DNA base derivatives found were typical products of hydroxyl radical (.OH) attack on DNA. Form...Continue Reading

Citations

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