作者: G. L. Neil , B. K. Bhuyan , L. G. Gray , S. L. Kuentzel , T. J. Fraser
DOI:
关键词: DNA synthesis 、 Tissue culture 、 Neoplasm 、 L1210 cells 、 Thymidine 、 Camptothecin 、 Cytotoxic T cell 、 Chemotherapy 、 Biology 、 Pharmacology
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.