ARAP1 and diabetic kidney disease: All these findings further confirmed the important role of ARAP1-AS2/ARAP1 in the pathogenesis of DKD as reported by our group (Yang et al., 2019a; Li et al., 2020a; Li et al., 2020b), but there may also be limitations to this study, as our current data cannot exclude the role of lncRNA-ARAP1-AS2/ARAP1 in other cell types, such as podocytes, in DKD.