| Abstract: | Three ACNU-resistant subclones were isolated and characterized from a wild-typed 9L rat glioma cell line in culture. At an early stage after cloning, these ACNU-resistant subclones showed a high frequency of chromosomal aberrations compared with nonresistant 9L cells. These ACNU-resistant subclones revealed a cross resistance to BCNU, CCNU, methyl CCNU, nitrogen mustard, cyclophosphamide, and cis-platinum, which are alkylating agents. Further studies are necessary to clarify the mechanisms of ACNU-resistance from the aspect of repair of DNA alkylation damage. |
