Aim To elucidate the relationship between the apohpoproteins, especially apoA-Ⅰ and the alteration of HDL subclasses in type Ⅱ a and Ⅱb hypedipidemic subjects. Methods Apolipoprotein (apo) A-Ⅰ contents of serum HDL subclasses in 68 type Ⅱa and 67 type Ⅱb hyperlipidemic subjects and 233 normal controls were determined by two-dimensional gel electrophoresis coupled with immunodetection method. Results Compared with normal controls, the contents of small-sized preβ1-HDL, HDL3b and HDL3a were significantly higher ( P 〈 0.01 ), but those...