Rat Kidney Slices for Evaluation of Apical Membrane Transporters in Proximal Tubular Cells

J Pharm Sci. 2019 Aug;108(8):2798-2804. doi: 10.1016/j.xphs.2019.03.031. Epub 2019 Apr 5.


Kidney slice has been often used as a tool reflecting basolateral transport in renal tubular epithelial cells. Recently, we reported that several important apical reabsorptive transporters such as Octn1/2, Sglt1/2, and Pept1/2 were functional in mouse kidney slices as well as transporter activities in basolateral side, which have been well accepted. Because rats are often used for preclinical pharmacodynamic and pharmacokinetic studies as well as mice, it is important to confirm applicability of rat kidney slices for evaluation of apically expressed transporters. The present study investigates usefulness of kidney slices from rats for evaluation of apical membrane transporters for efflux (multidrug resistance 1a, mdr1a) as well as influx (Octn1/2, Sglt1/2, Pept1/2). Na+-dependent uptake of ergothioneine (Octn1), carnitine (Octn2), and methyl-α-D-glucopyranoside (Sglt1/2) by rat kidney slices was observed, and the uptake was decreased by selective inhibitors. In addition, uptake of glycyl-sarcosine (Pept1/2) showed H+-dependence and was decreased by selective inhibitor. Furthermore, accumulation of mdr1a substrate azasetron was increased in the presence of zosuquidar, an mdr1a inhibitor, while strain differences existed. In conclusion, rat kidney slices should be useful for evaluation of renal drug disposition regulated by transporters in apical as well as basolateral membranes of rat renal proximal tubule cells.

Keywords: P-gp; drug disposition; reabsorption; renal transport; transporter.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • ATP Binding Cassette Transporter, Subfamily B / metabolism
  • Animals
  • Biological Transport
  • HEK293 Cells
  • Humans
  • Kidney / metabolism
  • Kidney Tubules, Proximal / metabolism*
  • Male
  • Organic Cation Transport Proteins / metabolism
  • Peptide Transporter 1 / metabolism
  • Pharmaceutical Preparations / metabolism
  • Pharmacokinetics
  • Rats
  • Rats, Wistar
  • Sodium-Glucose Transporter 1 / metabolism
  • Symporters / metabolism


  • ATP Binding Cassette Transporter, Subfamily B
  • Organic Cation Transport Proteins
  • Peptide Transporter 1
  • Pharmaceutical Preparations
  • Slc15a1 protein, rat
  • Slc22a4 protein, rat
  • Slc5a1 protein, rat
  • Sodium-Glucose Transporter 1
  • Symporters
  • multidrug resistance protein 3