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  • Title: [Development of blood examination method of serum amyloid A and LDL complex, and clinical application to prediction of cardiovascular event].
    Author: Mashiba S, Ogasawara K, Takeya M, Wada Y, Sahara M, Kojima S, Tabata K, Ueda M, Uchida K, Aizawa T, Kodama T.
    Journal: Rinsho Byori; 2004 Jan; 52(1):67-74. PubMed ID: 14968563.
    Abstract:
    In recent years, it has been reported that the acute-phase proteins C-reactive protein(CRP) and serum amyloid A(SAA), the sera levels of which are elevated in inflammation, are also elevated in coronary artery disease such as acute myocardial infarction. Also, high-sensitivity CRP assay is thought to be useful in predicting the prognosis of coronary heart disease. While investigating complexes of acute-phase proteins and low-density lipoprotein(LDL), we found a complex of LDL and SAA(SAA/LDL complex). The SAA/LDL complex in blood are formed from LDL and HDL by an oxidation reaction. Therefore, we developed an ELISA using anti-human SAA antibody and anti-human apoB, and determined a new method for measuring SAA/LDL complex in sera. We evaluated SAA/LDL complex as a new marker for prediction of prognosis in addition to the ordinary markers in consecutive 140 patients with stable coronary heart disease who had at least 1 coronary artery stenosis more than 50% in diameter at the diagnostic coronary angiography. Of these 140 patients, 2 developed fatal myocardial infarction, 2 cerebral infarction, and 17 angina pectoris requiring coronary revascularization therapy during 1 year and 6 months after blood examinations. The SAA/LDL complex value in this EVENT group of 21 patients was significantly higher than that in the control group of 119 individuals. High-sensitivity CRP (hs-CRP) assay and SAA measurement showed no significant difference between the 2 groups. The SAA/LDL complex reflects intravascular inflammation directly and can be a new marker more sensitive than hs-CRP or SAA for prediction of prognosis in patients with stable coronary artery disease.
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