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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 Am+J+Pathol
2016 ; 186
(11
): 2846-2856
Nephropedia Template TP
Rudemiller NP
; Patel MB
; Zhang JD
; Jeffs AD
; Karlovich NS
; Griffiths R
; Kan MJ
; Buckley AF
; Gunn MD
; Crowley SD
Am J Pathol
2016[Nov]; 186
(11
): 2846-2856
PMID27640148
show ga
Inappropriate activation of the renin angiotensin system (RAS) is a key
contributor to the pathogenesis of essential hypertension. During RAS activation,
infiltration of immune cells into the kidney exacerbates hypertension and renal
injury. However, the mechanisms underpinning the accumulation of mononuclear
cells in the kidney after RAS stimulation remain unclear. C-C motif chemokine 5
(CCL5) drives recruitment of macrophages and T lymphocytes into injured tissues,
and we have found that RAS activation induces CCL5 expression in the kidney
during the pathogenesis of hypertension and renal fibrosis. We therefore
evaluated the contribution of CCL5 to renal damage and fibrosis in hypertensive
and normotensive models of RAS stimulation. Surprisingly, during angiotensin
II-induced hypertension, CCL5-deficient (knockout, KO) mice exhibited markedly
augmented kidney damage, macrophage infiltration, and expression of
proinflammatory macrophage cytokines compared with wild-type controls. When
subjected to the normotensive unilateral ureteral obstruction model of endogenous
RAS activation, CCL5 KO mice similarly developed more severe renal fibrosis and
greater accumulation of macrophages in the kidney, congruent with enhanced renal
expression of the macrophage chemokine CCL2. In turn, pharmacologic inhibition of
CCL2 abrogated the differences between CCL5 KO and wild-type mice in kidney
fibrosis and macrophage infiltration after unilateral ureteral obstruction. These
data indicate that CCL5 paradoxically limits macrophage accumulation in the
injured kidney during RAS activation by constraining the proinflammatory actions
of CCL2.