A. V. Arakali

Learn More
Iproplatin is structurally unique among the platinum (Pt) agents in the clinic because it is a quadrivalent complex. On the basis of the redox parameters for the Pt(IV) and Pt(II) oxidation states in a chloride system, it has been suggested that Pt(IV) complexes will be reduced to Pt(II) complexes in a biological environment [7]. To test this hypothesis,(More)
The quadrivalent second-generation platinum complex iproplatin and an in vivo divalent metabolite of iproplatin,cis-dichloro-bis-isopropylamine platinum (CIP) were tested for binding to DNA in vitro. DNA binding was determined according to radioactivity measured using [14C]-iproplatin and [14C]-CIP and also by platinum content. Results indicate that (a)(More)
We have previously shown that a significant portion of the total platinum in the plasma of patients receiving iproplatin is protein-bound [17]. We have also identifiedcis-dichloro-bis-isopropylamine platinum(II) (CIP) as a major metabolite of iproplatin [19]. To understand the nature of the bound platinum, we carried out in vitro comparative protein-binding(More)
The acetone-sensitized irradiation using UV-B (ultraviolet light, 280-320 nm; sunlamps) of thymidylyl(3'-->5')deoxyfluorouridine monophosphate produces two main photoproducts. The distribution of these photoproducts is dependent on the pH of the irradiation solution. At pH 6, the cis-syn cyclobutane-type photodimer is the major product, whereas at high pH(More)
Acetone-sensitized irradiation using UV-B (sun lamp, lambda max = 313 nm) of deoxyfluorouridylyl-(3'-5')-thymidine monophosphate (d-FpT, F = fluorouracil), produces two major photoproducts, the cis-syn cyclobutane-type photodimer and a defluorinated (5-5) photoadduct, d-U5p5T. Product distribution is dependent on the pH of the irradiation solution, as was(More)
The mediation of radiation-induced damage to dinucleoside monophosphate by oxygen and by glutathione was studied. The sequence isomers d(TpA) and d(ApT) were X-irradiated in aqueous solutions and the products isolated by reverse-phase high-performance liquid chromatography. The main products were characterized by proton NMR spectroscopy. In the presence of(More)
The radiation chemistry of the dinucleoside monophosphate d(CpG) and its sequence isomer, d(GpC), has been examined in aqueous solutions saturated with either N2O or O2. The products were isolated using HPLC, and the major products were identified using proton NMR spectroscopy and mass spectrometry. The major products include 5,6-dihydroxy-5,6-dihydrouracil(More)
A combination of high-performance liquid chromatography (HPLC) and nuclear magnetic resonance (NMR) spectroscopy was used to analyze the products of X-irradiated aqueous solutions of the dinucleoside monophosphate thymidylyl(3'-5')-2'-deoxyadenosine, d(TpA), and its sequence isomer 2'-deoxyadenylyl(3'-5')thymidine, d(ApT). The products of d(TpA) include(More)
  • 1