ATF4 and diabetic cardiomyopathy: A recent observation using a diabetic cardiomyopathy rat model reveals that the GLP-1 analog liraglutide improved cardiac function, which is accompanied with a decrease in activating transcription factor 4 (ATF4) and TNF receptor associated factor 2 (TRAF2) and the down-regulation of Grp78 and caspase-3.