The effect of renal ischemia-reperfusion injury on expression of RAE-1 and H60 in mice kidney.
BACKGROUND
NKG2D, an activating receptor, may trigger NK and CD8+ T cells. Ligands for NKG2D and major histocompability complex class I chain-related antigen (MIC) have been reported to be expressed in rejected human renal allografts. MIC-NKG2D engagement may induce natural killer (NK) cell activation providing T-cell costimulation. We hypothesized that this interaction between innate and adaptive immunity may occur during kidney ischemia-reperfusion injury (IRI).


METHODS
Male C57BL/6 mice after right renal resection were subjected to 35 minutes of left renal ischemia: the ischemic group. Sham-operated mice underwent the same protocol without vascular occlusion. The sham and ischemic kidneys were removed at 2 to 7, 10, 14, or 28 days postoperatively. The normal, sham, and ischemic kidney tissues were collected for reverse-transcriptase polymerase chain reaction, and immunohistochemistry analysis of MIC homologues in mice (Rae-1 and H60).


RESULTS
Compared with no expression in sham control and normal kidneys, IRI caused mRNA expression of Rae-1 from 2 to 10 days postoperatively and protein expression of Rae-1 from 2 to 14 days postoperatively in ischemic kidneys. We observed no expression of H60 mRNA or protein in any kidney.


CONCLUSIONS
H60 transcripts have been reported to be present in the BALB/c background but not in C57BL/6. We found IRI did not cause H60 mRNA on protein expression in C57BL/6 kidneys. Rae-1 was absent in normal C57BL/6 kidneys. The IRI-induced expression of the NKG2D ligand, Rae-1, might activate NK and CD8+ T cells. Our results suggested that MIC may be an important link between innate and adaptive immunity in kidney IRI.
Feng
L
L
Lab of Transplant Engineering and Immunology, West China Hospital, Sichuan University, Guoxuexiang 37, Chengdu 610041, People's Republic of China. feng31@sohu.com
Cheng
F
F
Ye
Z
Z
Li
S
S
He
Y
Y
Yao
X
X
Tang
Q
Q
Li
Y
Y
D000818:Animals; D017931:DNA Primers; D004195:Disease Models, Animal; D007150:Immunohistochemistry; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D051379:Mice; D008810:Mice, Inbred C57BL; D015778:Minor Histocompatibility Antigens / Q000235:genetics*; D012079:Renal Circulation; D015427:Reperfusion Injury / Q000235:genetics* / Q000473:pathology; D020133:Reverse Transcriptase Polymerase Chain Reaction
D017931:DNA Primers; D008565:Membrane Proteins; D015778:Minor Histocompatibility Antigens; C491219:Raet1a protein, mouse; C114735:minor H antigen H60