Cisplatin-induced apoptosis in human proximal tubular epithelial cells is associated with the activation of the Fas/Fas ligand system.
The role of Fas and Fas ligand (Fas-L) in the apoptotic cell death process in cisplatin (CP)-treated human proximal tubular epithelial cells (PTECs) was examined. The human PTECs were treated with various concentrations (20-80 microM) of CP for 24 h, and the incidence of apoptosis in CP-treated cells was assessed by trypan blue staining, propidium iodide staining, in situ end labeling, and electron microscopy. The expression of Fas and Fas-L was detected by immunofluorescence microscopy. The results showed that: (1) CP-treatment resulted in a decreased number of live human PTECs and an increased number of dead cells, (2) CP-treated human PTECs showed an increased rate of apoptosis with its typical morphological features, and (3) expression of both Fas and Fas-L was upregulated in CP-treated human PTECs. These results indicate that CP treatment induces apoptosis in human PTECs and the activation of the Fas/Fas-L system may play an active role in the induction of the apoptotic cell death process.
Razzaque
M S
MS
Second Department of Pathology, Nagasaki University School of Medicine, Japan. razzaque@net.nagasaki-u.ac.jp
Koji
T
T
Kumatori
A
A
Taguchi
T
T
D017209:Apoptosis / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D002945:Cisplatin / Q000378:metabolism* / Q000494:pharmacology; D004847:Epithelial Cells / Q000187:drug effects / Q000378:metabolism; D053222:Fas Ligand Protein; D019084:Fluorescent Antibody Technique, Indirect; D006801:Humans; D007687:Kidney Tubules, Proximal / Q000166:cytology* / Q000378:metabolism; D008562:Membrane Glycoproteins / Q000378:metabolism*; D008856:Microscopy, Fluorescence; D019014:fas Receptor / Q000378:metabolism*
C505661:FASLG protein, human; D053222:Fas Ligand Protein; D008562:Membrane Glycoproteins; D019014:fas Receptor; D002945:Cisplatin