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Cholesterol Independent Suppression of Lymphocyte Activation, Autoimmunity and Glomerulonephritis by Apolipoprotein A-I in Normocholesterolemic Lupus-Prone Mice #MMPMID26466956
Black LL; Srivastava R; Schoeb TR; Moore RD; Barnes S; Kabarowski JH
J Immunol 2015[Nov]; 195 (10): 4685-98 PMID26466956show ga
Apolipoprotein A-I (ApoA-I), the major lipid-binding protein of high-density lipoprotein (HDL), can prevent autoimmunity and suppress inflammation in hypercholesterolemic mice by attenuating lymphocyte cholesterol accumulation and removing tissue oxidized lipids. However, whether ApoA-I mediates immune suppressive or anti-inflammatory effects in normocholesterolemic conditions and the mechanisms involved remain unresolved. We transferred bone marrow from SLE-prone Sle123 mice into normal, ApoA-I knockout (ApoA-I?/?) and ApoA-I transgenic (ApoA-Itg) mice. Increased ApoA-I in ApoA-Itg mice suppressed CD4+ T and B cell activation without changing lymphocyte cholesterol levels or reducing major ApoA-I-binding oxidized fatty acids. Unexpectedly, oxidized fatty acid peroxisome proliferator-activated receptor gamma (PPAR?) ligands 13-hydroxyoctadecadienoic acid (HODE) and 9-HODE were increased in lymphocytes of autoimmune ApoA-Itg mice. ApoA-I reduced Th1 cells independently of changes in CD4+FoxP3+ regulatory T cells or CD11c+ dendritic cell activation and migration. Follicular helper T cells, germinal center B cells and autoantibodies were also lower in ApoA-Itg mice. Transgenic ApoA-I also improved SLE-mediated glomerulonephritis. However, ApoA-I deficiency did not have opposite effects on autoimmunity or glomerulonephritis, possibly due to compensatory increases of ApoE on HDL. We conclude that although compensatory mechanisms prevent pro-inflammatory effects of ApoA-I deficiency in normocholesterolemic mice, increasing ApoA-I can attenuate lymphocyte activation and autoimmunity in SLE independently of cholesterol transport, possibly through oxidized fatty acid PPAR? ligands, and can reduce renal inflammation in glomerulonephritis.