title: High-density lipoprotein associated factors apoA-I and serum amyloid A in Chinese non-diabetic patients with coronary heart disease.
abstract: BACKGROUND
  High-density lipoprotein cholesterol (HDL-C) levels are a strong, independent inverse predictor of coronary heart disease (CHD). In this cross-sectional study we investigated the interrelationships between HDL-C and HDL related factors apolipoprotein A-I (apoA-I) and serum amyloid A (SAA) and the presence and extent of CHD in a population of Chinese patients with CHD.
  
  
  METHODS
  Two hundred and twenty-four consecutive patients took part in this study. Demographic data were obtained from hospital records. Serum chemical concentrations were measured by standard laboratory methods.
  
  
  RESULTS
  The concentrations of high-sensitive C-reactive protein (hsCRP) (median: 1.85 mg/L) and SAA (median: 9.40 mg/L) were significantly higher in the CHD group (P < 0.05), while concentrations of HDL-C ((1.03 +/- 0.25) mmol/L) and apoA-I ((604.59 +/- 105.79) mmol/L) were significantly lower than those in the non-CHD group (P < 0.05). The concentrations of apoA-I decreased with the increase in vascular damage, but the difference did not reach statistical significance. However, the concentrations of hsCRP and SAA increased with the increase in vascular damage. The unadjusted odd ratios (ORs) (CI) for apoA-I and SAA of the presence of CHD were 0.093 (0.990 - 0.997) (P = 0.00) and 2.571 (1.029 - 6.424) (P < 0.05), respectively. The association between elevated SAA and the presence of CHD was lost after adjusting for lipid status parameter concentrations. The associations between apoA-I, SAA and the extent of CHD remained strong, regardless of confounding variables.
  
  
  CONCLUSIONS
  Increased concentrations of SAA represent the inflammatory marker of the extent of coronary stenosis in patients with CHD. In contrast to SAA, the level of apoA-I was also associated with the presence of CHD, indicating that apoA-I was not only a marker of CHD presence but also a quantitative indicator of CHD extent. In short, determining the change apolipoprotein content within HDL particle is a more accurate and effective method to evaluate the impact of HDL on CHD.
authors.affiliation: Key Laboratory of Clinical Trial Research in Cardiovascular Drug, Ministry of Health, Cardiovascular Institute and Fu Wai Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing 100037, China.
authors.forename: Guo-liang
authors.initials: GL
authors.lastname: Chen
authors.forename: Li-wei
authors.initials: LW
authors.lastname: Liu
authors.forename: Shuang
authors.initials: S
authors.lastname: Xie
authors.forename: Hong
authors.initials: H
authors.lastname: Liu
authors.forename: Yu-qing
authors.initials: YQ
authors.lastname: Liu
authors.forename: Yi-shi
authors.initials: YS
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D016632:Apolipoprotein A-I / Q000097:blood*; D015415:Biomarkers; D008076:Cholesterol, HDL / Q000097:blood; D008078:Cholesterol, LDL / Q000097:blood; D003327:Coronary Disease / Q000097:blood*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D000685:Serum Amyloid A Protein / Q000032:analysis*
chemical_list: D016632:Apolipoprotein A-I; D015415:Biomarkers; D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D000685:Serum Amyloid A Protein