Impact of individual acute phase serum amyloid A isoforms on HDL metabolism in mice[S]

Journal of Lipid Research

Ailing Ji¹  Joanne M. Wroblewski¹  Deneys R. van der Westhuyzen¹  Myung-Hee Kim²  Richard J. Charnigo²  Frederick C. de Beer²  Nancy R. Webb³  Maria C. de Beer⁴ 

[1] Saha Cardiovascular Research Center, University of Kentucky Medical Center, Lexington, KY 40536;Departments of Internal Medicine, University of Kentucky Medical Center, Lexington, KY 40536;Departments of Statistics and Biostatistics, University of Kentucky, Lexington, KY 40506;Physiology, University of Kentucky Medical Center, Lexington, KY 40536;

关键词: apolipoproteins;    high density lipoprotein;    inflammation;    lipoproteins/metabolism;    scavenger receptors;    acute phase protein;   

DOI  :  

来源: DOAJ

【 摘 要 】

The acute phase (AP) reactant serum amyloid A (SAA), an HDL apolipoprotein, exhibits pro-inflammatory activities, but its physiological function(s) are poorly understood. Functional differences between SAA1.1 and SAA2.1, the two major SAA isoforms, are unclear. Mice deficient in either isoform were used to investigate plasma isoform effects on HDL structure, composition, and apolipoprotein catabolism. Lack of either isoform did not affect the size of HDL, normally enlarged in the AP, and did not significantly change HDL composition. Plasma clearance rates of HDL apolipoproteins were determined using native HDL particles. The fractional clearance rates (FCRs) of apoA-I, apoA-II, and SAA were distinct, indicating that HDL is not cleared as intact particles. The FCRs of SAA1.1 and SAA2.1 in AP mice were similar, suggesting that the selective deposition of SAA1.1 in amyloid plaques is not associated with a difference in the rates of plasma clearance of the isoforms. Although the clearance rate of SAA was reduced in the absence of the HDL receptor, scavenger receptor class B type I (SR-BI), it remained significantly faster compared with that of apoA-I and apoA-II, indicating a relatively minor role of SR-BI in SAA's rapid clearance. These studies enhance our understanding of SAA metabolism and SAA's effects on AP-HDL composition and catabolism.

【 授权许可】

Unknown