Characterization of circulating APOL1 protein complexes in African Americans

Journal of Lipid Research

James A. Snipes¹  Abraham K. Gebre²  Barry I. Freedman³  Julie A. Reisz⁴  Mariana Murea⁴  Gregory S. Shelness⁴  John S. Parks⁴  Cristina M. Furdui⁴  Lijun Ma⁵  Gregory A. Hawkins⁵  Allison Weckerle⁶  Dongmei Cheng⁶ 

[1] Department of Internal Medicine, Sections on Molecular Medicine Wake Forest School of Medicine, Winston-Salem, NC 27157;Nephrology, Wake Forest School of Medicine, Winston-Salem, NC 27157;Center for Genomics and Personalized Medicine Research, Wake Forest School of Medicine, Winston-Salem, NC 27157;Department of Internal Medicine, Sections on Molecular Medicine Wake Forest School of Medicine, Winston-Salem, NC 27157;Nephrology, Wake Forest School of Medicine, Winston-Salem, NC 27157;To whom correspondence should be addressed.;

关键词: apolipoprotein L1;    apolipoproteins;    high density lipoprotein;    kidney;    proteomics;    renal disease;   

DOI  :  

来源: DOAJ

【 摘 要 】

APOL1 gene renal-risk variants are associated with nephropathy and CVD in African Americans; however, little is known about the circulating APOL1 variant proteins which reportedly bind to HDL. We examined whether APOL1 G1 and G2 renal-risk variant serum concentrations or lipoprotein distributions differed from nonrisk G0 APOL1 in African Americans without nephropathy. Serum APOL1 protein concentrations were similar regardless of APOL1 genotype. In addition, serum APOL1 protein was bound to protein complexes in two nonoverlapping peaks, herein referred to as APOL1 complex A (12.2 nm diameter) and complex B (20.0 nm diameter). Neither of these protein complexes associated with HDL or LDL. Proteomic analysis revealed that complex A was composed of APOA1, haptoglobin-related protein (HPR), and complement C3, whereas complex B contained APOA1, HPR, IgM, and fibronectin. Serum HPR was less abundant on complex B in individuals with G1 and G2 renal-risk variant genotypes, relative to G0 (P = 0.0002–0.037). These circulating complexes may play roles in HDL metabolism and susceptibility to CVD.

【 授权许可】

Unknown