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Relationship between plasma apolipoprotein B concentrations and LDL particle number

Authors Morris P, McLain K, Malave H, Underberg J, Le N, Shapiro M, Winegar D, Pourfarzib R

Received 11 April 2014

Accepted for publication 30 May 2014

Published 18 September 2014 Volume 2014:5 Pages 237—242

DOI https://doi.org/10.2147/RRCC.S65976

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3


Pamela B Morris,1 Kellie H McLain,1 Hector A Malave,2 James A Underberg,3 Ngoc-Anh Le,4 Michael D Shapiro,5 Deborah A Winegar,6 Ray Pourfarzib6

1Division of Cardiology, Medical University of South Carolina, Charleston, SC, USA; 2Cardiology of Atlanta, Atlanta, GA, USA; 3Department of Medicine, New York University Langone Medical Center, New York, NY, USA; 4Atlanta Veterans Affairs Medical Center, Decatur, GA, USA; 5Oregon Health and Science University, Portland, OR, USA; 6LipoScience, Inc., Raleigh, NC, USA


Abstract: Many subjects with relatively normal, or even optimal, levels of low-density lipoprotein cholesterol (LDL-C) have increased atherogenic lipoprotein particle concentrations (apolipoprotein B [apoB] and LDL particle number [LDL-P] determined by nuclear magnetic resonance spectroscopy [NMR]). Numerous analyses have demonstrated that apoB and LDL-P predict the risk of future cardiovascular events more robustly than LDL-C, as estimated using the Friedewald equation. Little is known about the relationship between an individual's apoB and LDL-P level, and whether the relationship is comparable at different levels of LDL-C. The aim of this study was to examine the correlation between plasma apoB and LDL-P levels and specifically to evaluate the heterogeneity of LDL-P at low levels of apoB (< the 20th population percentile [78 mg/dL]). Data were derived from a group of consecutive patients added to a large, single laboratory database (LipoScience, Inc.) during a 1-week period in which a standard lipid profile, apoB, and LDL-P levels were available. When risk categories were assigned to the subjects using the Framingham Offspring Study's population percentiles for apoB and LDL-P, there was good agreement between the two measures when LDL-C levels were high (≥160 mg/dL). However, among individuals with low LDL-C and apoB, NMR analysis could identify a subgroup of individuals with potentially greater cardiovascular risk, as suggested by unexpected elevations in LDL-P.

Keywords: apolipoprotein B, LDL particle number, nuclear magnetic resonance spectroscopy, lipoproteins

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