Abstract
Purpose
To identify the rat hepatic basolateral transporters involved in the hepatic uptake of β-lactam antibiotics using nafcillin as a model β-lactam antibiotic that undergoes extensive biliary excretion.
Materials and Methods
Uptake by isolated rat hepatocytes and Xenopus laevis oocytes expressing organic anion transporting peptides (Oatp1, 2, and 4) and organic anion transporter (OAT2) was evaluated.
Results
Nafcillin uptake by isolated rat hepatocytes was saturable with the K m of 210 μM and was significantly inhibited by anionic compounds (estrone-3-sulfate and sulfobromophthalein), but not by cationic compounds (tetraethylammonium and 1-methyl-4-phenylpyridinium). In an in vitro uptake study by Xenopus oocytes expressing hepatic basolateral membrane transporters, nafcillin was transported by multiple Oatps with K m values of 4120 μM (Oatp1/Oatp1a1), 198 μM (Oatp2/Oatp1a4), and 1,570 μM (Oatp4/Oatp1b2), though it was not transported by hOAT2. Comparison of affinity and analysis by the relative activity factor method indicated that Oatp2 is the predominant contributor to the hepatic uptake of nafcillin. Cefadroxil, cefazolin, cefmetazole, cefoperazone, cefsulodin, and cephalexin, though not cefotaxime or ceftriaxone, were also substrates of Oatp2.
Conclusion
These findings suggest that Oatp2 plays a key role in the hepatic uptake of nafcillin and most other β-lactam antibiotics in rats.
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Abbreviations
- BSP:
-
sulfobromophthalein
- E13S:
-
estrone-3-sulfate
- MPP+ :
-
1-methyl-4-phenylpyridinium
- Mrp:
-
multidrug resistance-associated protein
- Ntcp:
-
Na+-taurocholate cotransporting polypeptide
- OAT/Oat:
-
organic anion transporter
- OATP/Oatp:
-
organic anion transporting polypeptide
- PCG:
-
benzylpenicillin
- RAF:
-
relative activity factor
- TEA:
-
tetraethylammonium
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Acknowledgement
A part of this study was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.
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Nakakariya, M., Shimada, T., Irokawa, M. et al. Predominant Contribution of Rat Organic Anion Transporting Polypeptide-2 (Oatp2) to Hepatic Uptake of β-Lactam Antibiotics. Pharm Res 25, 578–585 (2008). https://doi.org/10.1007/s11095-007-9427-9
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DOI: https://doi.org/10.1007/s11095-007-9427-9