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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Immunol
2015 ; 195
(10
): 4685-98
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English Wikipedia
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
PMID26466956
show ga
Apolipoprotein (Apo)A-I, the major lipid-binding protein of high-density
lipoprotein, 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 under normocholesterolemic
conditions and the mechanisms involved remain unresolved. We transferred bone
marrow from systemic lupus erythematosus (SLE)-prone Sle123 mice into normal,
ApoA-I-knockout (ApoA-I(-/-)) and ApoA-I-transgenic (ApoA-I(tg)) mice. Increased
ApoA-I in ApoA-I(tg) 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 ? ligands 13- and 9-hydroxyoctadecadienoic acid were increased in
lymphocytes of autoimmune ApoA-I(tg) 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-I(tg) mice. Transgenic ApoA-I also
improved SLE-mediated glomerulonephritis. However, ApoA-I deficiency did not have
the opposite effects on autoimmunity or glomerulonephritis, possibly as the
result of compensatory increases in ApoE on high-density lipoprotein. We conclude
that, although compensatory mechanisms prevent the proinflammatory 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 peroxisome proliferator-activated
receptor ? ligands, and it can reduce renal inflammation in glomerulonephritis.