Apolipoprotein A-I and apolipoprotein SAA half-lives during acute inflammation and amyloidogenesis.
The half-lives of two apolipoproteins of mouse high-density lipoproteins, apo A-I and apo SAA, were determined in normal animals and compared with those having an inflammatory condition, or inflammation leading to AA amyloid deposition. The apo A-I half-life was considerably shorter in animals with inflammation and in those that were preamyloidotic, than in controls (t1/2 of 3-3.5 h vs. 10-12 h). The average loss of apo A-I in controls over the first 10 h was 31.1 micrograms/ml per h, while that in inflamed animals was 58.7 micrograms/ml per h a 2-fold increase in apo A-I clearance. The apo SAA half-life was similar in all groups of animals and was of the order of 1.5 h. The concentration of apo SAA during inflammation is however considerably higher (500-1000-fold) than in controls, which implies a much greater clearance rate during inflammation and involving a process which is apparently not saturable. In addition to hypertriglyceridemia and Tangier's disease, ordinary acute inflammation can now be added to those pathological conditions which lead to a significant decrease in apo A-I half-life.
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Department of Pathology, Queen's University, Kingston, Canada.
Kisilevsky
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D000682:Amyloid / Q000096:biosynthesis*; D000686:Amyloidosis / Q000378:metabolism*; D000818:Animals; D016632:Apolipoprotein A-I; D001054:Apolipoproteins A / Q000378:metabolism*; D007249:Inflammation / Q000378:metabolism*; D008075:Lipoproteins, HDL / Q000378:metabolism; D008657:Metabolic Clearance Rate; D051379:Mice; D008808:Mice, Inbred CBA; D000685:Serum Amyloid A Protein / Q000378:metabolism*
D000682:Amyloid; D016632:Apolipoprotein A-I; D001054:Apolipoproteins A; D008075:Lipoproteins, HDL; D000685:Serum Amyloid A Protein