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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+Physiol+Renal+Physiol
2017 ; 312
(3
): F385-F397
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IL-17 mediates neutrophil infiltration and renal fibrosis following recovery from
ischemia reperfusion: compensatory role of natural killer cells in athymic rats
#MMPMID27852609
Mehrotra P
; Collett JA
; McKinney SD
; Stevens J
; Ivancic CM
; Basile DP
Am J Physiol Renal Physiol
2017[Mar]; 312
(3
): F385-F397
PMID27852609
show ga
T cells have been implicated in the pathogenesis of acute kidney injury (AKI) and
its progression to chronic kidney disease (CKD). Previous studies suggest that
Th17 cells participate during the AKI-to-CKD transition, and inhibition of T cell
activity by mycophenolate mofetil (MMF) or losartan attenuates the development of
fibrosis following AKI. We hypothesized that T cell-deficient rats may have
reduced levels of IL-17 cytokine leading to decreased fibrosis following AKI.
Renal ischemis-reperfusion (I/R) was performed on T cell-deficient athymic rats
(Foxn1(rnu-/rnu-)) and control euthymic rats (Foxn1(rnu-/+)), and CKD progression
was hastened by unilateral nephrectomy at day 33 and subsequent exposure to 4.0%
sodium diet. Renal fibrosis developed in euthymic rats and was reduced by MMF
treatment. Athymic rats exhibited a similar degree of fibrosis, but this was
unaffected by MMF treatment. FACS analysis demonstrated that the number of
IL-17(+) cells was similar between postischemic athymic vs. euthymic rats. The
source of IL-17 production in euthymic rats was predominately from conventional T
cells (CD3(+)/CD161(-)). In the absence of conventional T cells in athymic rats,
a compensatory pathway involving natural killer cells (CD3(-)/CD161(+)) was the
primary source of IL-17. Blockade of IL-17 activity using IL-17Rc receptor
significantly decreased fibrosis and neutrophil recruitment in both euthymic and
athymic rats compared with vehicle-treated controls. Taken together, these data
suggest that IL-17 secretion participates in the pathogenesis of AKI-induced
fibrosis possibly via the recruitment of neutrophils and that the source of IL-17
may be from either conventional T cells or NK cells.