HDAC4 and diabetic kidney disease: We and others have provided evidence that among class IIa HDACs isoforms, HDAC4 is most commonly expressed in renal tubular cells of a murine model of fibrosis induced by UUO injury (Xiong et al., 2019) and podocytes in a murine model of diabetic nephropathy and human diabetic kidneys (Wang et al., 2014).