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Previous studies by others have shown that thiols, such as glutathione, cause cleavage of DNA in the presence of Cu(II) ions and that the hydroxyl radical derived from molecular oxygen is the major cleaving species. In this paper, we present several lines of evidence that strongly suggest that molecular oxygen is not essential for DNA cleavage and that(More)
Genotoxic damage in responsive mammalian cells is implicated as a critical event in the induction of apoptosis. We have evaluated the time course of activation of apoptosis in HL-60 cells following treatment with (+/-)-anti-BPDE metabolite, a well established DNA damaging carcinogen. Programmed cell death, determined by typical cellular and molecular(More)
The pro-mutagenicity of chemically-induced methylation of DNA at the O6 position of deoxyguanosine was studied in cultured adult rat liver epithelial cells. To modify the level of O6-methyldeoxyguanosine (O6-medGuo) resulting from exposure to an alkylating agent, partial depletion of the O6-alkylguanine-DNA alkyltransferase (AGT) repair system was produced(More)
In vitro experiments to study interaction of the mutagenic flavonoid quercetin with DNA are described. Calf thymus DNA treated with quercetin for various time periods was subjected to S1 nuclease hydrolysis. Thermal melting profiles of treated DNA were also determined using S1 nuclease. The rate of DNA hydrolyzed after 1 hr of pretreatment with quercetin(More)
S1 nuclease hydrolysis and bezoylated naphthoylated DEAE-cellulose (BND-cellulose) chromatography have been used to demonstrate that alkylation of DNA by dimethyl sulfate at neutral pH leads to the production of partially denatured molecules under conditions where no significant depurination occurs. DNA was alkylated with increasing concentrations of the(More)
We have used hydroxyapatite (HA) chromatography and S1 nuclease hydrolysis to study the modification in the secondary structure of DNA caused by certain intercalating and non-intercalating ligands. The principal conclusions of HA experiments were as follows: (1) when native DNA, complexed with drugs believed to bind to DNA by intercalation (ethidium(More)
BACKGROUND Intramedullary spinal cord tumours (IMSCT) are among the uncommon lesions at spinal cord. They can present with a vast array of symptoms and cause severe neurological deficits. With advent and frequent use of MRI more and more patients with IMSCT are picked up. By using modern microsurgical techniques better surgical outcome is achieved. The(More)
S1 nuclease hydrolysis and benzoylated naphthoylated DEAE cellulose (BND-cellulose) chromatography have been used to study the effect of riboflavin and visible light on DNA. Native calf thymus DNA was incubated with riboflavin in the presence of fluorescent light for various time periods and subjected to S1 nuclease hydrolysis. An increasing degree of DNA(More)