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  • Title: Plasma proprotein convertase subtilisin/kexin type 9: a marker of LDL apolipoprotein B-100 catabolism?
    Author: Chan DC, Lambert G, Barrett PH, Rye KA, Ooi EM, Watts GF.
    Journal: Clin Chem; 2009 Nov; 55(11):2049-52. PubMed ID: 19713274.
    Abstract:
    BACKGROUND: Experimental studies suggest that proprotein convertase subtilisin/kexin type 9 (PCSK9) is an important regulator of LDL metabolism because of its ability to facilitate degradation of the LDL receptor. We investigated the association between plasma PCSK9 concentration and LDL apolipoprotein B-100 (apo B-100) metabolism in men with a wide range of body mass index values. METHODS: We used GC-MS to study the kinetics of LDL apo B-100 after intravenous administration of deuterated leucine and analyzed the data by compartmental modeling. The plasma PCSK9 concentration was measured by ELISA. RESULTS: Univariate regression analysis revealed the plasma PCSK9 concentration to be significantly and positively correlated with cholesterol (r = 0.543; P = 0.011), LDL cholesterol (r = 0.543; P = 0.011), apo B-100 (r = 0.548; P = 0.010), and LDL apo B-100 concentrations (r = 0.514; P = 0.023), and inversely correlated with the LDL apo B-100 fractional catabolic rate (FCR) (r = -0.456; P = 0.038). The association between plasma PCSK9 concentration and the LDL apo B-100 FCR remained statistically significant after adjusting for age, obesity, plasma insulin, homeostasis model assessment score, and dietary energy; however, this association had borderline significance after adjusting for plasma lathosterol. CONCLUSIONS: In men, variation in plasma PCSK9 concentration influences the catabolism of LDL apo B-100. This finding appears to be independent of obesity, insulin resistance, energy intake, and age.
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