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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 J+Immunol
2015 ; 195
(10
): 4973-85
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Tissue-Resident NK Cells Mediate Ischemic Kidney Injury and Are Not Depleted by
Anti-Asialo-GM1 Antibody
#MMPMID26453755
Victorino F
; Sojka DK
; Brodsky KS
; McNamee EN
; Masterson JC
; Homann D
; Yokoyama WM
; Eltzschig HK
; Clambey ET
J Immunol
2015[Nov]; 195
(10
): 4973-85
PMID26453755
show ga
NK cells are innate lymphoid cells important for immune surveillance, identifying
and responding to stress, infection, and/or transformation. Whereas conventional
NK (cNK) cells circulate systemically, many NK cells reside in tissues where they
appear to be poised to locally regulate tissue function. In the present study, we
tested the contribution of tissue-resident NK (trNK) cells to tissue homeostasis
by studying ischemic injury in the mouse kidney. Parabiosis experiments
demonstrate that the kidney contains a significant fraction of trNK cells under
homeostatic conditions. Kidney trNK cells developed independent of NFIL3 and
T-bet, and they expressed a distinct cell surface phenotype as compared with cNK
cells. Among these, trNK cells had reduced asialo-GM1 (AsGM1) expression relative
to cNK cells, a phenotype observed in trNK cells across multiple organs and mouse
strains. Strikingly, anti-AsGM1 Ab treatment, commonly used as an NK
cell-depleting regimen, resulted in a robust and selective depletion of cNKs,
leaving trNKs largely intact. Using this differential depletion, we tested the
relative contribution of cNK and trNK cells in ischemic kidney injury. Whereas
anti-NK1.1 Ab effectively depleted both trNK and cNK cells and protected against
ischemic/reperfusion injury, anti-AsGM1 Ab preferentially depleted cNK cells and
failed to protect against injury. These data demonstrate unanticipated
specificity of anti-AsGM1 Ab depletion on NK cell subsets and reveal a new
approach to study the contributions of cNK and trNK cells in vivo. In total,
these data demonstrate that trNK cells play a key role in modulating local
responses to ischemic tissue injury in the kidney and potentially other organs.