The Value and Distribution of High-Density Lipoprotein Subclass in Patients with Acute Coronary Syndrome

Background: High-density lipoprotein (HDL) enhances cholesterol efflux from the arterial wall and exhibits potent anti-inflammatory and anti-atherosclerosis (AS) properties. Whether raised HDL levels will clinically benefit patients with acute coronary syndrome (ACS) and the value at which these effects will be apparent, however, is debatable. This study examined the HDL subclass distribution profile in patients with ACS. Methods: Plasma HDL subclasses were measured in 158 patients with established ACS and quantified by two-dimensional gel electrophoresis and immunoblotting. ACS diagnosis was based on symptoms of cardiac ischemia, electrocardiogram (ECG) abnormalities, speciality cardiac enzyme change along with presence of coronary heart disease (CHD) on coronary angiography. Results: The small-sized preb1-HDL, HDL3b, and HDL3a levels were significantly higher, and the large-sized HDL2a and HDL2b levels were significantly lower in patients with ACS than in those with stable angina pectoris (SAP) and in normal control subjects. Meanwhile, with an elevation in the low-density lipoprotein cholesterol (LDL-C), fasting plasma glucose (FPG), body mass index (BMI), and blood pressure (BP), and the reduction in the high density lipoprotein cholesterol (HDL-C) levels, the HDL2b contents significantly decreased and the preb1-HDL contents significantly increased in patients with ACS. The correlation analysis revealed that the apolipoprotein (apo)A-I levels were positively and significantly with all HDL subclasse