期刊
PHARMACEUTICAL RESEARCH
卷 19, 期 1, 页码 27-33出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1023/A:1013647114152
关键词
Caco-2; cephalexin; glycylsarcosine; MDCK; peptide transporter
资金
- NIGMS NIH HHS [GM07175] Funding Source: Medline
Purpose. Bidirectional transport studies were conducted to determine whether Madin-Darby canine kidney (NDCK) cell monolayers could be used as an alternative to the traditional Caco-2 assay as a fast-growing in vitro model of peptide transport. Methods. Transport of cephalexin and glycylsarcosine across MDCK and Caco-2 cell monolayers was quantified using LC-LC/MS. Glycylsarcosine, p-aminohippuric acid (PAH), and tetraethylammonium chloride (TEA) were tested as inhibitors of cephalexin transport. Results. The ratio of apparent cephalexin permeabilities (apical to basolateral/basolateral to apical) obtained from MDCK monolayers was almost 5-fold greater than that obtained from Caco-2 monolayers. The opposite trend was observed for glycylsarcosine. When MDCK monolayers were used, glycylsarcosine reduced the cephalexin/apparent permeability ratio almost 90%. PAH and TEA did not inhibit cephalexin transport across MDCK or Caco-2 cell monolayers. Conclusion. MDCK cell monolayers may be a promising, fast-growing alternative to Caco-2 cells for identifying peptide transporter substrates. However, differences in the apical-to-basolateral transport of cephalexin and glycylsarcosine suggest that the basolateral transport mechanisms for these compounds are different in the two cell lines. Additionally, because the activity of the peptide transporter in MDCK cells was low, scaling factors may be required when using this cell line to predict in vivo drug absorption.
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