Low levels of IgM antibodies to phosphorylcholine predict cardiovascular disease in 60-year old men: effects on uptake of oxidized LDL in macrophages as a potential mechanism.

Abstract:

OBJECTIVE:We here determine the role of IgM antibodies against phosphorylcholine (anti-PC) in prediction of cardiovascular disease (CVD) and on macrophage uptake of Oxidized LDL (OxLDL). METHODS:From a screening of 4232 subjects, 60-year-old (2039 men and 2193 women), 211 incident cases of CVD (myocardial infarction, ischemic stroke, or hospitalized angina pectoris) and 633 age- and sex-matched controls were identified through a 5-7 year follow-up. Serum levels of IgM anti-PC was determined by ELISA. Anti-PC was extracted from pooled human IgM and the effect of anti-PC on the uptake of OxLDL was studied by FACScan. RESULTS:Relative risks (RR) with 95% confidence intervals (CI) by quartiles of anti-PC levels with quartile 4 set as the reference value (RR = 1.0) and adjusted for smoking, BMI, type II diabetes, hypercholesterolaemia, and high blood pressure yielded an excess risk for CVD only for those within the lowest quartile of anti-PC values with an RR of 1.37 (CI 0.87-2.16). However, for men stronger associations were noted with increasing multivariately adjusted RRs from quartile 4 to quartile 1. Subjects within quartile 1 (values below 29.7 U/ml) had a significantly increased RR of 1.96 (CI 1.09-3.55). Further adjustments for hsCRP gave essentially the same results. No excess risk was noted for women. Specific anti-PC could be extracted from IgM and these antibodies inhibited macrophage uptake of OxLDL. CONCLUSIONS:Low IgM anti-PC could be a novel risk marker for CVD among men. One possible mechanism could be inhibition of uptake of oxLDL in macrophages.

journal_name

J Autoimmun

journal_title

Journal of autoimmunity

authors

de Faire U,Su J,Hua X,Frostegård A,Halldin M,Hellenius ML,Wikström M,Dahlbom I,Grönlund H,Frostegård J

doi

10.1016/j.jaut.2009.05.003

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

73-9

issue

2

eissn

0896-8411

issn

1095-9157

pii

S0896-8411(09)00068-7

journal_volume

34

pub_type

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