Repair replication and unscheduled DNA synthesis in mammalian cell lines showing differential sensitivity to alkylating agents |
| |
Authors: | M Fox B W Fox |
| |
Affiliation: | Paterson Laboratories, Christie Hospital and Holt Radium Institute, Manchester M20 9BX Great Britain |
| |
Abstract: | Repair replication has been measured by CsCl density gradient centrifugation in cell lines showing differential sensitivity to mono- and bifunctional alkylating agents. A correlation between cellular sensitivity as measured by the D0 value and amount of repair replication was demonstrated after exposure of Yoshida cells to nitrogen mustard (HN2) and methylene dimethanesulphonate (MDMS). No differences in the amount of repair replication after methyl methanesulphonate (MMS) were observed in two L5178Y cell lines which differed in sensitivity by virtue of the shoulder size only. The Yoshida cell lines showed no difference in sensitivity to MMS and no difference in amount of repair replication. Incorporation of tritiated thymidine 9[3H]TdR) after drug treament was also measured by autoradiography. The qualitative differences observed between the two cell lines were similar to those obtained in density gradient experiments. The temporal pattern of [3H]TdR uptake indicated that the reduced repair replication observed in the sensitive line after HN2 and MDMS is not due to slower synthesis. The kinetics of [3H]TdR incorporation differed for all three mutagens suggesting that different enzymes may be involved in each case. |
| |
Keywords: | NH2 nitrogen mustard IUdR 5-iodo-2′-deoxyuridine MDMS methylane dimethanesulphonate MMS methyl methanesulphonate MNNG triatiated thymidine |
本文献已被 ScienceDirect 等数据库收录! |