Isolation of a high-density-lipoprotein conversion factor from XXXX plasma. A possible role of @entity15783 as its activator.

@entity1 @entity15783 @entity692 @entity2975 @entity214
1. A high-density-lipoprotein (HDL) conversion factor was partially purified from @entity1 plasma by precipitation with (NH4)2SO4, ultracentrifugation, cation-exchange chromatography, anion-exchange chromatography and chromatography on a column of @entity692 . 2. This factor modulates the particle size of HDL by converting a homogeneous population into new populations of particles, some of which are smaller and others larger than those in the original population. 3. The isolated HDL conversion factor appeared as one major band and at least three minor bands on @entity214 / @entity2975 -gel electrophoresis; attempts to purify this factor further resulted in loss of conversion activity. 4. Preparations of the HDL conversion factor were stable after heating to 58 degrees C for 1 h, and were shown not to possess proteolytic activity. 5. The conversion factor was distinct from the known apolipoproteins, none of which had HDL conversion activity. 6. Addition of @entity15783 had a dose-dependent potentiating effect on the process promoted by the HDL conversion factor.
