Research Paper Advance Articles

Figure 4. Organic anionic transporter RNA-seq gene expressions. Medullar (A–D) and cortical (E–H) tissue expressions of OAT4, OAT1, OAPT4C1, and ABCC2, respectively. Illustration of transporters in the proximal tubule cell (I). OAT1 and OATP4C1 are the uptake transporters on the basolateral surface, while ABCC2 is the efflux transporter localized at the apical surface. OAT4 is thought to play a role in both reabsorption and secretion from the apical side. All genes were differentially expressed between control and across CKD groups in both cortex and medullar (FDR<0.1 in all cases). Bars indicate means. Asterisks indicate Dunn’s multiple comparisons tests: *P<0.05, **P<0.01. OAT1/4, organic anion transporter family member 1/4; OATP4C1, organic anion transporting peptide family member 4C1; ABCC2, ATP-binding cassette subfamily C member 2. CKD1/2: CKD stages 1 and 2; CKD3/4: CKD stages 3 and 4; Amyloid: CKD by amyloidosis. Panel I created with BioRender.com.