Osteopontin expressed in tubular epithelial cells regulates NK cell-mediated kidney ischemia reperfusion injury.
Renal ischemia reperfusion injury (IRI) occurs after reduced renal blood flow and is a major cause of acute injury in both native and transplanted kidneys. Studies have shown diverse cell types in both the innate and the adaptive immune systems participate in kidney IRI as dendritic cells, macrophages, neutrophils, B cells, CD4(+) NK(+) cells, and CD4(+) T cells all contribute to this form of injury. Recently, we have found that NK cells induce apoptosis in tubular epithelial cells (TECs) and also contribute to renal IRI. However, the mechanism of NK cell migration and activation during kidney IRI remains unknown. In this study, we have identified that kidney TECs express a high level of osteopontin (OPN) in vitro and in vivo. C57BL/6 OPN-deficient mice have reduced NK cell infiltration with less tissue damage compared with wild-type C57BL/6 mice after ischemia. OPN can directly activate NK cells to mediate TEC apoptotic death and can also regulate chemotaxis of NK cells to TECs. Taken together, our study's results indicate that OPN expression by TECs is an important factor in initial inflammatory responses that involves NK cells activity in kidney IRI. Inhibiting OPN expression at an early stage of IRI may be protective and preserve kidney function after transplantation.
Zhang
Zhu-Xu
ZX
The Multi-Organ Transplant Program, London Health Sciences Centre, London, Ontario, Canada. zhuxu.zhang@lhsc.on.ca
Shek
Kelvin
K
Wang
Shuang
S
Huang
Xuyan
X
Lau
Arthur
A
Yin
Ziqin
Z
Sun
Hongtao
H
Liu
Weihua
W
Garcia
Bertha
B
Rittling
Susan
S
Jevnikar
Anthony M
AM
D000818:Animals; D017209:Apoptosis / Q000276:immunology; D002465:Cell Movement / Q000276:immunology; D002478:Cells, Cultured; D004847:Epithelial Cells / Q000378:metabolism*; D005260:Female; D005434:Flow Cytometry; D015870:Gene Expression; D007150:Immunohistochemistry; D007668:Kidney / Q000098:blood supply* / Q000378:metabolism / Q000473:pathology; D007684:Kidney Tubules / Q000166:cytology; D007694:Killer Cells, Natural / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008815:Mice, Inbred Strains; D018345:Mice, Knockout; D053495:Osteopontin / Q000235:genetics / Q000378:metabolism*; D015427:Reperfusion Injury / Q000276:immunology*; D020133:Reverse Transcriptase Polymerase Chain Reaction
D053495:Osteopontin