Selenoproteins, cholesterol-lowering drugs, and the consequences: revisiting of the mevalonate pathway.
3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) and peroxisome proliferator-activated receptor alpha activators (fibrates) are the backbone of pharmacologic hypercholesterolemia and dyslipidemia treatment. Many of their clinical effects, however, are still enigmatic. This article describes how a side road of the mevalonate pathway, characterized in recent years, can rationalize a major fraction of these unexplained observations. This side road is the enzymatic isopentenylation of selenocysteine-tRNA([Ser]Sec) (Sec-tRNA), the singular tRNA to decode the unusual amino acid selenocysteine. The functionally indispensable isopentenylation of Sec-tRNA requires a unique intermediate from the mevalonate pathway, isopentenyl pyrophosphate, which concomitantly constitutes the central building block for cholesterol biosynthesis, and whose formation is suppressed by statins and fibrates. The resultant inhibition of Sec-tRNA isopentenylation profoundly decreases selenoprotein expression. This effect might seamlessly explain the immunosuppressive, redox, endothelial, sympatholytic, and thyroidal effects of statins and fibrates as well as their common side effects and drug interactions.
Moosmann
Bernd
B
Department of Pathobiochemistry, Johannes Gutenberg University, Medical School, Duesbergweg 6, 55099 Mainz, Germany.
Behl
Christian
C
D000818:Animals; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000009:adverse effects / Q000494:pharmacology*; D006937:Hypercholesterolemia / Q000188:drug therapy* / Q000503:physiopathology*; D008798:Mevalonic Acid / Q000378:metabolism*; D047492:Peroxisome Proliferator-Activated Receptors / Q000009:adverse effects / Q000494:pharmacology*; D011506:Proteins / Q000037:antagonists & inhibitors*; D012346:RNA, Transfer, Amino Acyl; D051140:Selenoproteins
D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors; D047492:Peroxisome Proliferator-Activated Receptors; D011506:Proteins; D012346:RNA, Transfer, Amino Acyl; D051140:Selenoproteins; C112705:selenocysteinyl-tRNA; D008798:Mevalonic Acid