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Isolation, Characterization, And High Throughput Extracellular Flux Analysis of Mouse Primary Renal Tubular Epithelial Cells
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Characterization of monocarboxylate transport in human kidney HK-2 cells

Qi Wang1, Ye Lu, Min Yuan

  • 1Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, State University of New York, Amherst, New York 14260, USA.

Molecular Pharmaceutics
|December 5, 2006
PubMed

Insights

Monocarboxylate transporters (MCTs) are present in human kidney cells and exhibit polarized expression. HK-2 cells serve as a valuable in vitro model for studying renal proximal tubule monocarboxylate transport.

Area of Science:

  • Renal Physiology
  • Molecular Biology
  • Cell Biology

Background:

  • Monocarboxylate transporters (MCTs) play crucial roles in cellular metabolism and transport.
  • Understanding MCT expression and function in the kidney is essential for comprehending renal physiology and disease.

Purpose of the Study:

  • To characterize the expression and function of MCTs in human kidney HK-2 cells.
  • To compare MCT expression in HK-2 cells with human kidney tissue.
  • To validate HK-2 cells as an in vitro model for renal proximal tubule transport studies.

Main Methods:

  • RT-PCR and Western blot analyses for mRNA and protein expression.
  • Immunofluorescence staining for MCT1 membrane localization.
  • Characterization of D-lactate and butyrate transport kinetics and inhibition.
  • Small-interference RNA (siRNA) mediated knockdown of MCT1.

Main Results:

  • mRNA of MCT1, -2, -3, and -4 isoforms were detected in HK-2 cells and human kidney cortex.
  • MCT1 showed predominant localization on the basal membranes of HK-2 cells.
  • HK-2 cells demonstrated pH- and concentration-dependent uptake of D-lactate and butyrate, inhibited by MCT analogues and classical inhibitors.
  • MCT1 knockdown significantly reduced D-lactate and butyrate uptake.

Conclusions:

  • MCTs are expressed in both HK-2 cells and human kidney cortex.
  • HK-2 cells exhibit polarized MCT expression and functional pH-dependent transport of D-lactate and butyrate.
  • HK-2 cells are a suitable in vitro model for studying monocarboxylate transport in renal proximal tubule cells.

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