Fig. 4

Changes in the (a) HMOX1, (b) SOD, (c) Bcl2, IL-1β, and TNF-α transcription levels in response to low dose irradiation. Twenty-four hours following exposure to radiation (0.5–2 Gy), WI-38 cells were harvested, and target genes expression relative to β-actin were determined by real-time PCR. *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001 by Student’s t-test.