Figure 4

M344 induced ATF3 is mediated through the Integrated Stress Response. A, Western blot analysis for ATF3 and actin in ATF4 (+/-) and (-/-) MEFs treated with solvent control, thapsigargin (1 μM), M344 (1 and 5 μM) for 24 hrs. B, Chromatin Immunoprecipication (ChIP) assay of chromatin/DNA complexes isolated from MCF-7 cells treated with solvent control or M344 (5 μM) for 24 hrs using acetylated Histone 4 (AcH4) antibody and analyzing by PCR for presence of ATF3 or p21 promoter regions.