(Hypertension. 1999;33:53-59.)
© 1999 American Heart Association, Inc.
Scientific Contributions |
Autoantibodies to OxLDL Are Decreased in Individuals With Borderline Hypertension
From the Department of Medicine (R.W., J.F.), Unit of Rheumatology, and Center for Molecular Medicine, Karolinska Hospital; the Department of Emergency and Cardiovascular Medicine (U.d F., C.L.), Karolinska Hospital; the Division of Cardiovascular Epidemiology (U.d F.), Institute of Environmental Medicine, Karolinska Institute, Stockholm, Sweden; and the Department of Medicine (R.W., J.L.W., J.F.), University of California, San Diego.
Abstract—Elevated antibody levels to oxidized low-density lipoprotein (aOxLDL) have been shown to correlate with the degree of atherosclerosis in some studies. On the other hand, immunization of experimental animals with OxLDL, leading to enhanced aOxLDL levels, inhibits the development of the disease. The role of antibodies to OxLDL during different stages of disease development is thus not clear. The objective of this study was to determine the level of aOxLDL in early cardiovascular disease, such as borderline hypertension (BHT). Seventy-three men with BHT were matched with 75 age-matched normotensive (NT) men (diastolic blood pressures, 85 to 94 and <80 mm Hg, respectively). Antibody levels to epitopes of OxLDL were determined by use of conventional and chemiluminescence ELISA techniques. Presence of carotid atherosclerosis was determined by B-mode ultrasonography; atherosclerotic plaques were detected in 29 individuals. BHT men had significantly lower aOxLDL levels of IgG class (P=0.001) and IgM class (P=0.001) than NT controls, as determined using chemiluminescence ELISA. Similar results were obtained using conventional ELISA, with which aOxLDL of IgG (P=0.0002) and IgM (P=0.026) classes and antibody levels to malondialdehyde–LDL were significantly lower in BHT individuals. There was no difference in antibody levels between individuals with or without carotid atherosclerosis. It is not clear whether the decreased aOxLDL levels in BHT are due to a decreased immune reaction to OxLDL or to an increased consumption of aOxLDL due to binding to early atherosclerotic lesions. The possible implications of these findings are discussed.
Key Words: hypertension, borderline • atherosclerosis • low-density lipoproteins, oxidized • antibodies
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