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      Case report of male child with elevated lipoprotein (a) leading to acute ischemic stroke

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          Oxidized phospholipids, Lp(a) lipoprotein, and coronary artery disease.

          Lp(a) lipoprotein binds proinflammatory oxidized phospholipids. We investigated whether levels of oxidized low-density lipoprotein (LDL) measured with use of monoclonal antibody E06 reflect the presence and extent of obstructive coronary artery disease, defined as a stenosis of more than 50 percent of the luminal diameter. Levels of oxidized LDL and Lp(a) lipoprotein were measured in a total of 504 patients immediately before coronary angiography. Levels of oxidized LDL are reported as the oxidized phospholipid content per particle of apolipoprotein B-100 (oxidized phospholipid:apo B-100 ratio). Measurements of the oxidized phospholipid:apo B-100 ratio and Lp(a) lipoprotein levels were skewed toward lower values, and the values for the oxidized phospholipid:apo B-100 ratio correlated strongly with those for Lp(a) lipoprotein (r=0.83, P<0.001). In the entire cohort, the oxidized phospholipid:apo B-100 ratio and Lp(a) lipoprotein levels showed a strong and graded association with the presence and extent of coronary artery disease (i.e., the number of vessels with a stenosis of more than 50 percent of the luminal diameter) (P<0.001). Among patients 60 years of age or younger, those in the highest quartiles for the oxidized phospholipid:apo B-100 ratio and Lp(a) lipoprotein levels had odds ratios for coronary artery disease of 3.12 (P<0.001) and 3.64 (P<0.001), respectively, as compared with patients in the lowest quartile. The combined effect of hypercholesterolemia and being in the highest quartiles of the oxidized phospholipid:apo B-100 ratio (odds ratio, 16.8; P<0.001) and Lp(a) lipoprotein levels (odds ratio, 14.2; P<0.001) significantly increased the probability of coronary artery disease among patients 60 years of age or younger. In the entire study group, the association of the oxidized phospholipid:apo B-100 ratio with obstructive coronary artery disease was independent of all clinical and lipid measures except one, Lp(a) lipoprotein. However, among patients 60 years of age or younger, the oxidized phospholipid:apo B-100 ratio remained an independent predictor of coronary artery disease. Circulating levels of oxidized LDL are strongly associated with angiographically documented coronary artery disease, particularly in patients 60 years of age or younger. These data suggest that the atherogenicity of Lp(a) lipoprotein may be mediated in part by associated proinflammatory oxidized phospholipids. Copyright 2005 Massachusetts Medical Society.
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            Antisense therapy targeting apolipoprotein(a): a randomised, double-blind, placebo-controlled phase 1 study.

            Lipoprotein(a) (Lp[a]) is a risk factor for cardiovascular disease and calcific aortic valve stenosis. No effective therapies to lower plasma Lp(a) concentrations exist. We have assessed the safety, pharmacokinetics, and pharmacodynamics of ISIS-APO(a)Rx, a second-generation antisense drug designed to reduce the synthesis of apolipoprotein(a) (apo[a]) in the liver.
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              Phenotypic Characterization of Genetically Lowered Human Lipoprotein(a) Levels.

              Genomic analyses have suggested that the LPA gene and its associated plasma biomarker, lipoprotein(a) (Lp[a]), represent a causal risk factor for coronary heart disease (CHD). As such, lowering Lp(a) levels has emerged as a therapeutic strategy. Beyond target identification, human genetics may contribute to the development of new therapies by defining the full spectrum of beneficial and adverse consequences and by developing a dose-response curve of target perturbation.
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                Author and article information

                Journal
                Journal of Clinical Apheresis
                J Clin Apher
                Wiley
                07332459
                December 2017
                December 2017
                January 31 2017
                : 32
                : 6
                : 574-578
                Affiliations
                [1 ]Division of Clinical Pharmacology; University of Kansas Medical Center; Kansas City Kansas USA
                [2 ]Department of Internal Medicine; University of Kansas Medical Center; Kansas City Kansas USA
                [3 ]Department of Pediatrics; University of Kansas Medical Center; Kansas City Kansas USA
                [4 ]Department of Neurology; University of Kansas Medical Center; Kansas City Kansas USA
                [5 ]Department of Radiology; University of Kansas Medical Center; Kansas City Kansas USA
                Article
                10.1002/jca.21525
                79bda99e-5333-4737-b72a-798e79024848
                © 2017

                http://doi.wiley.com/10.1002/tdm_license_1.1

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