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2017 ; 7
(1
): 3997
Nephropedia Template TP
gab.com Text
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English Wikipedia
Immune regulation by oral tolerance induces alternate activation of macrophages
and reduces markers of plaque destabilization in Apob(tm2Sgy)/Ldlr(tm1Her/J)
mice
#MMPMID28638138
Thota LN
; Ponnusamy T
; Philip S
; Lu X
; Mundkur L
Sci Rep
2017[Jun]; 7
(1
): 3997
PMID28638138
show ga
Atherosclerosis is the leading cause for cardiovascular mortality. We determined
the effect of multi-antigenic construct expressing three peptides AHC (ApoB100,
HSP60 and outer membrane protein of chlamydia pneumonia) in stabilizing advanced
atherosclerosis in Apob(tm2Sgy)/Ldlr(tm1Her/J) mice. Atherosclerosis was induced
by feeding high fat diet (HFD) to mice for 10 weeks, followed by five oral dosing
with purified AHC or ovalbumin on alternate days and continued on HFD for another
10 weeks. Tolerance was associated with significantly higher numbers of
regulatory T cells both in aortic sinus and spleen with higher mRNA expression of
CTLA4 (3 fold), Foxp3 (1.4 folds) and TGF-? (1.62) in aorta. Tregs cells were
found to induce alternate activation of macrophages to M2 phenotype, with a
reduction in plaque inflammation. AHC treatment showed evidence of plaque
stabilization as observed by reduction in plaque necrosis in aortic sinus (35.8%)
and in brachiocephalic artery (26%), with reduced expression of Tissue factor and
MMP9. Macrophage apoptosis was reduced and collagen content was enhanced by
treatment. Our results suggest that tolerance to atherogenic peptides increases
regulatory T cells which activate M2 macrophages, prevent T cell proliferation
and reduce plaque destabilization and inflammatory markers thus providing
evidences for plaque stabilization in mice with advanced atherosclerosis.