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• W2008194229 abstract "Antitumor activity of cisplatin is exerted by covalent binding to DNA. For comparison, studies of cisplatin-DNA complexes often employ the very similar but inactive transplatin. In this work, thermal and thermodynamic properties of DNA complexes with these compounds were studied using differential scanning calorimetry (DSC) and computer modeling. DSC demonstrates that cisplatin decreases thermal stability (melting temperature, Tm) of long DNA, and transplatin increases it. At the same time, both compounds decrease the enthalpy and entropy of the helix–coil transition, and the impact of transplatin is much higher. From Pt/nucleotide molar ratio rb = 0.001, both compounds destroy the fine structure of DSC profile and increase the temperature melting range (ΔT). For cisplatin and transplatin, the dependences δTm vs rb differ in sign, while δΔT vs rb are positive for both compounds. The change in the parameter δΔT vs rb demonstrates the GC specificity in the location of DNA distortions. Our experimental results and calculations show that 1) in contrast to [Pt(dien)Cl]Cl, monofunctional adducts formed by transplatin decrease the thermal stability of long DNA at [Na+] > 30 mM; 2) interstrand crosslinks of cisplatin and transplatin only slightly increase Tm; 3) the difference in thermal stability of DNA complexes with cisplatin vs DNA complexes with transplatin mainly arises from the different thermodynamic properties of their intrastrand crosslinks. This type of crosslink appears to be responsible for the antitumor activity of cisplatin. At any [Na+] from interval 10–210 mM, cisplatin and transplatin intrastrand crosslinks give rise to destabilization and stabilization, respectively." @default.
• W2008194229 created "2016-06-24" @default.
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• W2008194229 date "2014-08-01" @default.
• W2008194229 modified "2023-09-26" @default.
• W2008194229 title "Comparative thermal and thermodynamic study of DNA chemically modified with antitumor drug cisplatin and its inactive analog transplatin" @default.
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• W2008194229 doi "https://doi.org/10.1016/j.jinorgbio.2014.04.010" @default.
• W2008194229 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24831492" @default.
• W2008194229 hasPublicationYear "2014" @default.
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