Human dipeptide transporter, hPEPT1, stably transfected into Chinese hamster ovary cells.

Article Details

Citation

Covitz KM, Amidon GL, Sadee W

Human dipeptide transporter, hPEPT1, stably transfected into Chinese hamster ovary cells.

Pharm Res. 1996 Nov;13(11):1631-4.

PubMed ID
8956326 [ View in PubMed
]
Abstract

PURPOSE: A cDNA encoding the H(+)-coupled peptide transporter, hPEPT1, has previously been cloned from human ileum (8). The objective of this study was to establish a stably transfected cell line expressing hPEPT1 in mammalian cell culture. METHODS: The hPEPT1 cDNA was subcloned into an expression vector carrying the CMV promoter and a neomycin resistance gene. This vector, pCDNA3-PEPT1, was transiently transfected into several cell lines to identify those capable of expressing PEPT1 transport function. CHO cells were selected and stably transfected with PEPT1 (CHO-PEPT1). Dipeptide transport activity was measured with 3H-Gly-Sar, in the presence and absence of inhibitors. RESULTS: The clonal cell line, CHO-PEPT1, displayed high transport activity. Dipeptide transport was sensitive to pH and specific for dipeptides and other small peptides. Peptidomimetic antibiotics, such as cephalexin, were competitors for peptide transport. CONCLUSIONS: The stably transfected cell line, CHO-PEPT1 exhibits enhanced transport over that of cell lines with native expression of PEPT1, and therefore, represents a useful tool for rapid screening of drugs that utilize the peptide transporter in the human intestine for absorption.

DrugBank Data that Cites this Article

Drug Transporters
DrugTransporterKindOrganismPharmacological ActionActions
AmpicillinSolute carrier family 15 member 1ProteinHumans
Unknown
Inhibitor
Details
AzidocillinSolute carrier family 15 member 1ProteinHumans
Unknown
Inhibitor
Details
CephalexinSolute carrier family 15 member 1ProteinHumans
Unknown
Substrate
Inhibitor
Details