Regulation of elements from the CHOP gene by selected factors. (A) Schematic alignment of DNA sequences of conserved regions of the insulin gene promoter and CHOP gene promoter/intron I and relative DNA-binding sites for bZIP transcription factors. The boxed region is the NFAT consensus. The shaded regions indicate MARE consensus sequences. Underlined sequences include C/EBP-β and ATF-CRE sites. (B and C) Promoter–reporter assays of CHOP gene promoter regions 3× −320 to −300 bp (B) and +2,624 to +2,643 bp (C) in Min6 cells maintained in 25 mM glucose overexpressing indicated bZIP transcription factors. V, vector only; M, MafA; A, Atf-2; C, C/EBPβ; F, c-Fos; J, c-Jun. Promoter assays were repeated a minimum of three times.