High-dose atorvastatin causes a rapid sustained increase in human serum PCSK9 and disrupts its correlation with LDL cholesterol.
Proprotein convertase subtilisin kexin type 9 (PCSK9) is a key regulator of serum LDL-cholesterol (LDL-C) levels. PCSK9 is secreted by the liver into the plasma and binds the hepatic LDL receptor (LDLR), causing its subsequent degradation. We first demonstrated that a moderate dose of atorvastatin (40 mg) increases PCSK9 serum levels, suggesting why increasing statin doses may have diminished efficacy with regard to further LDL-C lowering. Since that initial observation, at least two other groups have reported statin-induced PCSK9 increases. To date, no analysis of the effect of high-dose atorvastatin (80 mg) on PCSK9 over time has been conducted. Therefore, we studied the time course of atorvastatin (80 mg) in human subjects. We measured PCSK9 and lipid levels during a 2-week lead-in baseline period and every 4 weeks thereafter for 16 weeks. We observed that atorvastatin (80 mg) caused a rapid 47% increase in serum PCSK9 at 4 weeks that was sustained throughout 16 weeks of dosing. Importantly, while PCSK9 levels were highly correlated with total cholesterol (TC), LDL-C, and triglyceride (TG) levels at baseline, atorvastatin (80 mg) completely abolished all of these correlations. Together, these results further suggest an explanation for why increasing doses of statins fail to achieve proportional LDL-C lowering.
Welder
Greg
G
University of Florida, Gainesville, FL, USA.
Zineh
Issam
I
Pacanowski
Michael A
MA
Troutt
Jason S
JS
Cao
Guoqing
G
Konrad
Robert J
RJ
D000069059:Atorvastatin; D008078:Cholesterol, LDL / Q000097:blood*; D005260:Female; D006538:Heptanoic Acids / Q000378:metabolism* / Q000627:therapeutic use; D006801:Humans; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000378:metabolism* / Q000627:therapeutic use; D006937:Hypercholesterolemia / Q000188:drug therapy; D008297:Male; D000071449:Proprotein Convertase 9; D043484:Proprotein Convertases; D011758:Pyrroles / Q000378:metabolism* / Q000627:therapeutic use; D012697:Serine Endopeptidases / Q000097:blood*; D014280:Triglycerides / Q000097:blood
D008078:Cholesterol, LDL; D006538:Heptanoic Acids; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors; D011758:Pyrroles; D014280:Triglycerides; D000069059:Atorvastatin; C472125:PCSK9 protein, human; D000071449:Proprotein Convertase 9; D043484:Proprotein Convertases; D012697:Serine Endopeptidases