Human gut Actinobacteria boost drug absorption by secreting P-glycoprotein ATPase inhibitors

Abstract

SUMMARYDrug efflux transporters are a major determinant of drug efficacy and toxicity. A canonical example is P-glycoprotein (P-gp), an efflux transporter that controls the intestinal absorption of diverse compounds. Despite reports that P-gp expression depends on the microbiome, the mechanisms responsible and their physiological relevance remain unclear. Surprisingly, we found that the cardiac drug-metabolizing gut ActinobacteriumEggerthella lentaincreases drug absorption in mice through post-translational inhibition of P-gp ATPase efflux activity. P-gp inhibition is conserved in theEggerthellaceaefamily but absent in other Actinobacteria. Comparative genomics identified genes associated with P-gp inhibition. Finally, activity-guided biochemical fractionation coupled to metabolomics identified a cluster of isoflavonoids produced byE. lentarelated to plant-derived P-gp inhibitors. These results highlight the unexpected overlap between diet- and microbiome-derived compounds, and the importance of considering the broader relevance of the gut microbiome for drug disposition beyond first-pass metabolism.One Sentence SummaryThe gut bacteriumEggerthella lentasecretes inhibitors of P-glycoprotein ATPase activity, accelerating drug absorption.