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• W1966441128 startingPage "240" @default.
• W1966441128 abstract "Exposure of cells to heat inhibits a number of nuclear activities associated with semi-conservative replication of DNA including the incorporation of radiolabelled precursors into acid-insoluble DNA, the initiation of new replicons, the elongation of the DNA fibre at the replication fork, the synthesis and deposition of new histones into chromatin and the reorganization of nascent DNA into mature chromatin. These effects are likely to underlie the heat sensitivity of S-phase cells and may contribute to the radiosensitization observed in this phase of the cell cycle. While some of these effects may be explained as 'passive' consequences of heat-induced damage on chromatin structures experiments reviewed here point to the activation of a checkpoint as a contributing factor to the observed inhibition of DNA replication. Activation of a heat responsive S-phase checkpoint targets the activity of RPA via interaction with nucleolin. Nucleolin, a major nucleolar protein, is found normally sequestered in the nucleolus. Exposure of cells to heat causes a rapid translocation of nucleolin from the nucleolus into the nucleoplasm that enables RPA/nucleolin interaction. This interaction inhibits functions of RPA associated with the initiation of DNA replication and contributes to the immediate inhibition of DNA synthesis observed after heat shock. The results suggest that the nucleolus serves as a sequestration centre for the temporary inactivation of regulatory molecules, such as nucleolin, capable of regulating essential cellular functions after heat shock. It is speculated that this regulatory process is integrated in the network of responses that determine cell sensitivity to heat and that it may be involved in heat radiosensitization to killing as well." @default.
• W1966441128 created "2016-06-24" @default.
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• W1966441128 date "2004-03-01" @default.
• W1966441128 modified "2023-10-13" @default.
• W1966441128 title "Evidence for an S-Phase checkpoint regulating DNA replication after heat shock: a review" @default.
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• W1966441128 doi "https://doi.org/10.1080/02656730310001656379" @default.
• W1966441128 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15195518" @default.
• W1966441128 hasPublicationYear "2004" @default.
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