Diurnal expression and function of peptide transporter 1 (PEPT1).

  • Qandeel H
  • Duenes J
  • Zheng Y
 et al. 
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BACKGROUND Protein is absorbed primarily as di/tripeptides, which are transported into the enterocyte exclusively by H(+)/peptide cotransporter 1 (PEPT1). Diurnal changes in expression and function of several other mucosal transporters occur in rat. Diurnal variations in mRNA, protein, and transport function of PEPT1 occur in rat duodenum and jejunum, but not in ileum. METHODS Mucosal levels of mRNA and protein were determined at 9 AM, 3 PM, 9 PM, and 3 AM (n=6 each) by real time RT-PCR and Western blotting, respectively, in rats maintained in a 12-h light/dark room [light 6 AM to 6 PM]; transporter-mediated uptake of dipeptide (Gly-Sar) was also measured by everted sleeve technique. RESULTS mRNA transcripts of PEPT1 and Gly-Sar uptake varied diurnally in duodenum and jejunum (peak at 3 PM, P

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  • Hisham G Qandeel

  • Judith A Duenes

  • Ye Zheng

  • Michael G Sarr

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