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OATP1B1 polymorphism as a determinant of erythromycin disposition
C S Lancaster1, G H Bruun, C J Peer
1Department of Pharmaceutical Sciences, St Jude Children's Research Hospital, Memphis, Tennessee, USA.
Erythromycin metabolism is influenced by the OATP1B1 transporter, not just CYP3A4. Genetic variants in OATP1B1 (SLCO1B1) affect how the body processes this antibiotic, impacting its drug interactions.
Area of Science:
- Pharmacology
- Drug Metabolism
- Genetics
Background:
- Hepatic solute carriers influence drug pharmacokinetics, including the probe drug erythromycin.
- The role of Organic Anion Transporting Polypeptide 1B1 (OATP1B1) in mediating these interactions is hypothesized.
Purpose of the Study:
- To investigate the role of OATP1B1 in erythromycin transport and metabolism.
- To determine if OATP1B1 genetic variants affect erythromycin pharmacokinetics.
Main Methods:
- In vitro studies using stably transfected Flp-In T-Rex293 cells to assess erythromycin transport by OATP1B1 variants.
- In vivo studies in mice deficient for the ortholog transporter Oatp1b2.
- Analysis of human genetic data linking SLCO1B1 variants to erythromycin metabolism.
Main Results:
- Erythromycin is a substrate of OATP1B1 (wild type), with reduced transport by the OATP1B1*5 variant.
- Oatp1b2 deficiency in mice decreased erythromycin metabolic rate by 52%.
- The human SLCO1B1 c.521T>C variant (rs4149056) was associated with decreased erythromycin metabolism.
Conclusions:
- OATP1B1 plays a significant role in erythromycin transport and metabolism.
- Impairment of OATP1B1 function can alter erythromycin metabolism independently of CYP3A4 activity.
- Genetic variations in SLCO1B1 influence erythromycin pharmacokinetics in humans.
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