The levels of mRNA related to endoplasmic reticulum stress and apoptosis in of activating transcription factor 4 (ATF4) knockout mice induced by high salt. (A–G) ATF4, C/EBP-homologous protein (CHOP), BCL-2, BCL-X, BH3-interacting domain death agonist (BID), Bcl-2-like protein 11 (BIM), caspase-3 mRNA expression. WT-NS – wild-type+normal salt group; WT-HS – wild-type+high salt group; KO-NS – ATF4+/−+normal salt group; KO-HS – ATF4+/−+high salt group. * P<0.05.