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2015 ; 10
(10
): e0139350
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Knockout of Toll-Like Receptors 2 and 4 Prevents Renal
Ischemia-Reperfusion-Induced Cardiac Hypertrophy in Mice
#MMPMID26448184
Trentin-Sonoda M
; da Silva RC
; Kmit FV
; Abrahão MV
; Monnerat Cahli G
; Brasil GV
; Muzi-Filho H
; Silva PA
; Tovar-Moll FF
; Vieyra A
; Medei E
; Carneiro-Ramos MS
PLoS One
2015[]; 10
(10
): e0139350
PMID26448184
show ga
We investigated whether the pathways linked to Toll-like receptors 2 and 4 (TLRs)
are involved in renal ischemia-reperfusion (I/R)-induced cardiac hypertrophy.
Wild type (WT) C57BL/6J, TLR2-/- and TLR4-/- mice were subjected to left kidney
ischemia for 60 min followed by reperfusion for 5, 8, 12 and 15 days. Proton
density magnetic resonance showed alterations in the injured kidney from WT mice,
together with signs of parenchymal edema and higher levels of vimentin mRNA,
accompanied by: (i) small, but significant, increase in serum urea after 24 h,
(ii) 100% increase in serum creatinine at 24 h. A serum peak of inflammatory
cytokines occurred after 5 days of reperfusion. Heart weight/body weight and
heart weight/tibia length ratios increased after 12 and 15 days of reperfusion,
respectively. Cardiac hypertrophy markers, B-type natriuretic peptide (BNP) and
?-actin, left ventricle mass, cardiac wall thickness and myocyte width increased
after 15 days of reperfusion, together with longer QTc and action potential
duration. Cardiac TLRs, MyD88, HSP60 and HSP70 mRNA levels also increased. After
15 days of reperfusion, absence of TLRs prevented cardiac hypertrophy, as
reflected by similar values of left ventricular cardiac mass and heart
weight/body weight ratio compared to the transgenic Sham. Renal tissular injury
also ameliorated in both knockout mice, as revealed by the comparison of their
vimentin mRNA levels with those found in the WT on the same day after I/R. The
I/R TLR2-/- group had TNF-?, IFN-? and IL-1? levels similar to the non-I/R group,
whereas the TLR4-/- group conserved the p-NF-?B/NF- ?B ratio contrasting with
that found in TLR2-/-. We conclude: (i) TLRs are involved in renal I/R-induced
cardiac hypertrophy; (ii) absence of TLRs prevents I/R-induced cardiac
hypertrophy, despite renal lesions seeming to evolve towards those of chronic
disease; (iii) TLR2 and TLR4 selectively regulate the systemic inflammatory
profile and NF- ?B activation.
|Actins/metabolism
[MESH]
|Animals
[MESH]
|Cardiomegaly/*etiology/metabolism/prevention & control
[MESH]