Figure 4. Genetic reduction of Atm attenuates aging phenotypes and reduces cellular senescence in vivo. (A) Representative images (left panel) of 15-week-old Ercc1-/Δ and Ercc1-/ΔAtm+/- mice illustrating the severity of their dystonia. (B) The composite score of aging symptoms (right panel) was plotted at the indicated ages. n=8-10 mice per group. (C) qRT-PCR analysis of mRNA expression in liver from 12-week-old WT, Atm+/-, Ercc1-/Δ and Ercc1-/ΔAtm+/- mice. n=3-6 per group. (D) qRT-PCR analysis of mRNA expression in quadriceps from 12-week-old WT, Atm+/-, Ercc1-/Δ and Ercc1-/ΔAtm+/- mice. n=3-11 per group. (E) qRT-PCR analysis of mRNA expression in liver from 10 to 12-week-old WT, p65+/-, Ercc1-/Δ and Ercc1-/Δp65+/- mice. n=4-5 per group. (F) mRNA expression of senescence markers in the liver of 12-week-old Ercc1-/Δ mice treated with 10 mg/kg of KU-55933 intraperitoneally 3 times per week for two weeks. n = 3 per group. Graphs represent mean+/- s.e.m. P value was determined using Student’s t-test. *p<0.05, **p<0.01, ***p <0.001, ****p <0.0001.