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Cy3-conjugated affinity-pure F(ab��)2 donkey anti-human IgG (H+L) and Dylight? 549-conjugated affinity-pure F(ab��)2 donkey anti-goat IgG (H+L) were from Jackson ImmunoResearch Laboratories (West Groves, PA, USA). Human purified ApoA-1 was kindly provided by R. James (Department of Internal Medicine, Clinical Diabetes Unit, Medical Faculty, University of Geneva) and was isolated by ultracentrifugation followed by HDL delipidation as described elsewhere [9, 10]. Statistical analysis.? Analyses were performed using Statistica software (StatSoft, Tulsa, OK, http://www.selleckchem.com/products/DAPT-GSI-IX.html USA). Fisher��s exact test and Mann�CWhitney U-test were used when appropriate to compare groups of patients. For in vitro experiments, Kruskal�CWallis test was used to analyse the dose�Cresponse relationship and Mann�CWhitney U-test was used to determine P values. Results were expressed as median, interquartile range (IQR) and range unless stated otherwise. Two-sided P values http://www.selleckchem.com/products/Adriamycin.html cytokine/MMP profile that is increasingly being recognized as associated with atherosclerotic plaque vulnerability in humans [15, 28�C31]. To further explore a possible causative link between the presence of anti-ApoA-1 antibodies and elevated IL-6 and TNF-�� levels in MI patients, we stimulated human macrophages with polyclonal anti-human ApoA-1 http://www.selleck.cn/products/dabrafenib-gsk2118436.html IgG and isotype control IgG, as well as IgG fractions purified from pooled serum samples of MI patients who tested either positive (pool+) or negative (pool?) for anti-ApoA-1 IgG. Experiments were performed on four different macrophage preparations for anti-ApoA-1 IgG/controls and on 12 macrophage preparations for IgG fractions prepared from MI patients. To account for the well-known interindividual variation in macrophage reactivity, results are expressed as fold induction compared to baseline. As shown in Fig.?1a,b, exposure of macrophages to anti-ApoA-1 IgG induced a dose-dependent increase in IL-6 and TNF-��, with an eightfold increase in IL-6 and a 15-fold increase in TNF-�� production at a concentration of 40?��g?mL?1 anti-ApoA-1 IgG. Similarly, pool+ IgG (500?��g?mL?1) induced a significantly stronger IL-6 and TNF-�� production by 4- and 21-folds, respectively, compared to pool? (Fig.?1c,d).