Figure 4.
Increased radiation survival in AT cells upon forced expression of IGF-IR. (A) Western blot analysis of IGF-IR expression in GM5849 cells, which lack ATM, and in GM5849 subclones transfected with a plasmid-expressing IGF-IR driven by a viral promoter. (B) Clonogenic survival after exposure to IR of subclones 3 (5849cI3) and 7 (5849cI7), both of which were judged by Western blot in A to express increased levels of IGF-IR, in comparison with the parental 5849 AT mutant cells and to an unrelated wild-type cell line, 637.