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2017 ; 7
(1
): 9193
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Leukocytic Toll-Like Receptor 2 Deficiency Preserves Cardiac Function And Reduces
Fibrosis In Sustained Pressure Overload
#MMPMID28835616
Wang JW
; Fontes MSC
; Wang X
; Chong SY
; Kessler EL
; Zhang YN
; de Haan JJ
; Arslan F
; de Jager SCA
; Timmers L
; van Veen TAB
; Lam CSP
; Kleijn DPV
Sci Rep
2017[Aug]; 7
(1
): 9193
PMID28835616
show ga
An involement of Toll-like receptor 2 (TLR2) has been established in cardiac
dysfunction after acute myocardial infarction; however, its role in chronic
pressure overload is unclear. We sought to evaluate the role of TLR2 in cardiac
hypertrophy, fibrosis and dysfunction in sustained pressure overload. We induced
pressure overload via transverse aortic constriction (TAC) in TLR2(-/-) and wild
type (WT) mice, and followed temporal changes over 8 weeks. Despite similar
increases in heart weight, left ventricular (LV) ejection fraction (EF) and
diastolic function (mitral E/A ratio) were preserved in TLR2(-/-) mice but
impaired in WT mice following TAC. TAC produced less LV fibrosis in TLR2(-/-)
mice associated with lower mRNA levels of collagen genes (Col1a1 and Col3a1) and
lower protein level of TGFbeta1, compared to WT mice. Following TAC, the influx
of macrophages and CD3 T cells into LV was similar between TLR2(-/-) and WT mice,
whereas levels of cyto/chemokines were lower in the heart and plasma in TLR2(-/-)
mice. TLR2(-/-) bone marrow-derived cells protected against LVEF decline and
fibrosis following TAC. Our findings show that leukocytic TLR2 deficiency
protects against LV dysfunction and fibrosis probably via a reduction in
inflammatory signaling in sustained pressure overload.