[On the seeming and real atherogenicity of LDLP-IgG immune complexes in blood plasma and the arterial wall].

LDLP-antibody immune complexes and free LDLP were isolated from the serum and aortal wall of people who had died of myocardial infarction; their atherogenicity was compared on the basis of their capture by mouse peritoneal macrophages. The experiment showed that the capture of serum and aortal autoimmune LDPT-antibody complexes was approximately 2.5 times higher than that of free serum lipoproteins (mostly native ones). However, the capture of free (mostly modified) aortal LDLP was approximately 3.6 times higher than that of aortal immune complexes. According to the data received, the comparative atherogenicity of immune complexes and free lipoproteins can be ranked in the following order: modified LDLP --> modified LDLP-IgG complex --> native LDLP. The study shows that LDLP-antibody immune complexes formed in a rabbit's organism get extremely quickly eliminated from bloodstream, probably due to their active capture by reticuloendothelial system cells. The authors suggest that the formation of antilipoprotein autoantibodies and lipoprotein-antibody complexes is a protective response of the organism to appearance of highly atherogenic modified lipoproteins directed towards the weakening of the atherogenicity of such lipoproteins and the intensification of their elimination from bloodstream.