Cell-Kill Kinetics of Several S-Phase-specific Drugs

作者: G. L. Neil , B. K. Bhuyan , L. G. Gray , S. L. Kuentzel , T. J. Fraser

DOI:

关键词: DNA synthesisTissue cultureNeoplasmL1210 cellsThymidineCamptothecinCytotoxic T cellChemotherapyBiologyPharmacology

摘要: Summary The drugs [1-β-d-arabinofuranosylcytosine (ara-C), hydroxyurea (HU), 5-hydroxy-2-formylpyridine thiosemicarbazone (5-HP), and camptothecin sodium salt (camptothecin)] considered in this paper markedly inhibit DNA synthesis are maximally cytotoxic to cells S phase. In these studies, high-specific-activity thymidine- 3 H (HSA-TdR- H) was used as a control compound which killed but did not affect the progression of into S. cell-kill kinetics indicated that ara-C, HU, 5-HP, unlike camptothecin, blocked L1210 from progressing presence drug. We found were G 1 by HU started moving immediately after drug removed. Therefore, time interval between two doses gave maximal cell kill same for HSA-TdR- H. However, exposed ara-C 5-HP took about 2 hr recover effect then progress (between either or 5-HP) longer than needed Camptothecin block and, therefore, with those recovery single exposure determined. correlated well required kill.

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