Induction of apoptosis in ischemia-reperfusion model of mouse kidney: possible involvement of Fas.

Journal of the American Society of Nephrology : JASN
S NogaeTakehiko Koji

Abstract

Although ischemia-reperfusion of mouse kidney is known to cause severe renal failure due to tubular cell death, the exact cellular mechanism responsible for this phenomenon is not clear. To investigate the spatial and temporal development of renal cell death and the role of Fas/APO-1/CD95 (Fas) in this process, the left renal vessels were occluded in a group of mice for 30, 60, or 120 min followed by reperfusion for 24 h (n = 4 for each group). Analysis of the isolated DNA in agarose-gel electrophoresis revealed a typical ladder pattern of bands consisting of multiples of 180 to 200 bp, considered the hallmark of apoptosis. The intensity of the bands increased proportionately with the duration of ischemia. Histochemical analysis using terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling showed the presence of nuclei with DNA double-strand breaks specifically in distal renal tubules of the outer medulla. The presence of apoptosis was also confirmed by electron microscopy. Analysis of total RNA by Northern blotting revealed one appropriate-sized band for Fas mRNA in the normal kidney, which intensified in the ischemia-reperfused kidney. Moreover, nonradioactive in situ hybridization revealed that distal re...Continue Reading

Citations

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