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Publication abstract

Statin therapy causes gut dysbiosis in mice through a PXR-dependent mechanism

Jose A. Caparrós-Martín†, Ricky R. Lareu†, Joshua P. Ramsay, Jörg Peplies, F. Jerry Reen, Henrietta A. Headlam, Natalie C. Ward, Kevin D. Croft, Philip Newsholme, Jeffery D. Hughes and Fergal O’Gara

https://doi.org/10.1186/s40168-017-0312-4

Abstract

Background

Statins are a class of therapeutics used to regulate serum cholesterol and reduce the risk of heart disease. Although statins are highly effective in removing cholesterol from the blood, their consumption has been linked to potential adverse effects in some individuals. The most common events associated with statin intolerance are myopathy and increased risk of developing type 2 diabetes mellitus. However, the pathological mechanism through which statins cause these adverse effects is not well understood.

Results

Using a murine model, we describe for the first time profound changes in the microbial composition of the gut following statin treatment. This remodelling affected the diversity and metabolic profile of the gut microbiota and was associated with reduced production of butyrate. Statins altered both the size and composition of the bile acid pool in the intestine, tentatively explaining the observed gut dysbiosis. As also observed in patients, statin-treated mice trended towards increased fasting blood glucose levels and weight gain compared to controls. Statin treatment affected the hepatic expression of genes involved in lipid and glucose metabolism. Using gene knockout mice, we demonstrated that the observed effects were mediated through pregnane X receptor (PXR).

Conclusion

This study demonstrates that statin therapy drives a profound remodelling of the gut microbiota, hepatic gene deregulation and metabolic alterations in mice through a PXR-dependent mechanism. Since the demonstrated importance of the intestinal microbial community in host health, this work provides new perspectives to help prevent the statin-associated unintended metabolic effects.

Keywords

Statins Gut microbiota Dysbiosis Bile acids Short-chain fatty acids Type 2 diabetes mellitus Pregnane X receptor