Figure 2. miR-148b modulates radiosensitivity in lung cancer cells.
(A) Quantitative real-time PCR analysis of relative miR-148b expression in A549 cells transfected with miR-148b mimic or miR-148b inhibitor. Data represent mean ± S.D., n=3. **, P<0.01. (B) Clonogenic survival in control, mimic or inhibitor transfected cells after exposure to 4 Gy of γ-radiation. Survival was normalized to unirradiated control cells. Data represent mean ± S.D., n=3. **, P<0.01; ***, P<0.001. (C). DNA damage was assessed by γ-H2AX foci staining. A549 cells transfected with miR-148b mimic or inhibitor were irradiated with 2 Gy of γ-radiation, stained with γ-H2AX antibody at subsequent time intervals, and γ-H2AX foci were counted. *, P<0.05 compared with control transfected cells. To quantify the number of γ-H2AX foci, at least 100 nuclei were analysed from each sample.