| First Author | Ernest S | Year | 1995 |
| Journal | Am J Physiol | Volume | 269 |
| Issue | 2 Pt 1 | Pages | C323-33 |
| PubMed ID | 7653514 | Mgi Jnum | J:28265 |
| Mgi Id | MGI:75888 | Doi | 10.1152/ajpcell.1995.269.2.C323 |
| Citation | Ernest S, et al. (1995) Expression and function of P-glycoprotein in a mouse kidney cell line. Am J Physiol 269(2 Pt 1):C323-33 |
| abstractText | P-glycoprotein (PGP), a transporter conferring multidrug resistance to cancer cells, is expressed in the kidney. C219 monoclonal antibody binding revealed PGP in proximal tubules and mesangium of mouse kidneys. A cell line (TKPTS) expressing PGP was developed from proximal tubules of the 8Tg(SV40E)Bri7 mouse. Northern blot analysis demonstrated a 5.0-kb message identified as mdr1 by ribonuclease protection assay. Cyclosporin A (CSA) at 0.15 and 10 microM increased cellular accumulation of verapamil (VRP) by 32 and 121%, respectively (P < 0.001). VRP at 5 microM increased steady-state cellular accumulation of CSA by 46% (P = 0.02). Basal-to-apical transport of the PGP substrate vinblastine was inhibited by VRP. Rhodamine-123 (R-123) influx was rapid and independent of PGP. R-123 efflux was inhibited by VRP and CSA. Inhibition of PGP transport by VRP, CSA, and PSC-833 decreased the 50% effective dose of adriamycin. The concomitant administration of VRP and CSA was not deleterious and coincided with preferential accumulation of VRP over CSA. Inhibition of PGP-mediated transport is demonstrated as a mechanism of renal cell toxicity. |
