Effects of capsaicin on intestinal cephalexin absorption in rats

Yukiko Komori, Tetsuya Aiba, Risa Sugiyama, Chie Nakai, Hiromu Kawasaki, Yuji Kurosaki

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


The effects of capsaicin on intestinal cephalexin absorption were investigated by means of in situ single pass perfusion in rats to clarify whether this pungent compound present in spice is a potential factor altering the intestinal drug absorption processes. Under the control condition, cephalexin was absorbed at a rate of 1.16±0.08 and 0.90±0.06 nmol/min/cm in the jejunum and ileum, respectively. The intestinal cephalexin absorption rate was decreased when capsaicin was dissolved in the perfusate at a concentration of 400 μM, being 0.54±0.07 and 0.46±0.10 nmol/min/cm in the jejunum and ileum, respectively. The inhibitive effect of capsaicin on intestinal cephalexin absorption was diminished when ruthenium red, a non-selective inhibitor of the transient receptor potential (TRP) cation channels, was intravenously infused into the rat during the experiment. Moreover, when we evaluated the paracellular permeability of cephalexin by utilizing a competitive inhibitor, glycylsarcosine, it was demonstrated that glycylsarcosine-insensitive intestinal cephalexin absorption in the jejunum was increased by 4.5 times in the presence of 400 μM capsaicin. These findings indicate that capsaicin affects both transcellular and paracellular pathways of intestinal cephalexin absorption by interacting with the TRP cation channels in intestinal tissues, in which capsaicin seems to change the transport activity of H+/peptide co-transporter 1 (PEPT1), and to a lesser degree, it seems to alter the paracellular permeability of the intestinal epithelia.

Original languageEnglish
Pages (from-to)547-551
Number of pages5
JournalBiological and Pharmaceutical Bulletin
Issue number3
Publication statusPublished - Mar 2007


  • Absorption
  • Capsaicin
  • Cephalexin
  • Paracellular permeability
  • Peptide co-transporter (PEPT)1
  • Transient receptor potential (TRP)

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science


Dive into the research topics of 'Effects of capsaicin on intestinal cephalexin absorption in rats'. Together they form a unique fingerprint.

Cite this