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Ivan Tancevski, Andreas Wehinger, Egon Demetz, Philipp Eller, Kristina Duwensee, Julia Huber, Kathrin Hochegger, Wilfried Schgoer, Catherine Fievet, Frans Stellaard, Mats Rudling, Josef R. Patsch, Andreas Ritsch, Reduced Plasma High-Density Lipoprotein Cholesterol in Hyperthyroid Mice Coincides with Decreased Hepatic Adenosine 5′-Triphosphate-Binding Cassette Transporter 1 Expression, Endocrinology, Volume 149, Issue 7, 1 July 2008, Pages 3708–3712, https://doi.org/10.1210/en.2007-1387
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The aim of the study was to investigate the influence of severe hyperthyroidism on plasma high-density lipoprotein cholesterol (HDL-C). Recently, it was shown in mice that increasing doses of T3 up-regulate hepatic expression of scavenger receptor class B, type I, resulting in increased clearance of plasma HDL-C. Here, we show that severe hyperthyroidism in mice did not affect hepatic expression of scavenger receptor class B, type I, but reduced hepatic expression of ATP-binding cassette transporter 1, accompanied by a 40% reduction of HDL-C. The sterol content of bile, liver, and feces was markedly increased, accompanied by up-regulation of hepatic cholesterol 7α-hydroxylase, and ATP-binding cassette transporter 5, which is known to promote biliary sterol secretion upon dimerization with ATP-binding cassette transporter 8. Both control and hyperthyroid mice exerted identical plasma clearance of iv injected [3H]HDL-C, supporting the view that severe hyperthyroidism does not affect HDL-C clearance but, rather, its formation via hepatic ATP-binding cassette transporter 1.
