Fig. 4. CerS2 confers all ionizing radiation-induced lignoceroyl-CoA-dependent CerS activity.
(A) Proteins from subcellular fractions purified from HeLa cells were analyzed by SDS-PAGE/western blot for the presence of CerS2. (B) Lignoceroyl-CoA-dependent CerS activity was measured in HeLa cell homogenate prepared from cells transfected with a CerS2-specific shRNA vector 32 h after exposure to 15 Gy. Data represent 1 of 2 similar experiments each. For each experiment, CerS isoform-specific mRNA down-regulation was confirmed by real-time qPCR.