Abstract
Comparing normal human urothelial (NHU) cells to a panel of six representative urothelial cell carcinoma (UCC)-derived cell lines, we showed that while TRAIL receptor expression patterns were similar, susceptibility to soluble recombinant crosslinked TRAIL fell into three categories. 4/6 carcinoma lines were sensitive, undergoing rapid and extensive death; NHU and 253J cells were partially resistant and HT1376 cells, like normal fibroblasts, were refractory. Both normal and malignant urothelial cells underwent apoptosis via the same caspase-8/9-mediated mechanism. Rapid receptor downregulation was a mechanism for evasion by some UCC cells. TRAIL resistance in malignant urothelial cells was partially dependent on FLIP(L) and was differentially mediated by p38(MAPK), whereas in normal cells, resistance was mediated by NF-kappaB. Importantly, extensive killing of UCC cells could be induced using noncrosslinked TRAIL after prolonged exposure, with no damage to their homologous, normal urothelial cell counterparts.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Apoptosis
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CASP8 and FADD-Like Apoptosis Regulating Protein / metabolism
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Caspases / metabolism
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Cell Line
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Cell Line, Tumor
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Cross-Linking Reagents / chemistry
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Down-Regulation
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Humans
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Ligands
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Membrane Glycoproteins / chemistry
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Membrane Glycoproteins / pharmacology
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NF-kappa B / metabolism
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Peptide Fragments / chemistry
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Peptide Fragments / pharmacology
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Receptors, TNF-Related Apoptosis-Inducing Ligand / biosynthesis*
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Receptors, Tumor Necrosis Factor / biosynthesis*
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Recombinant Fusion Proteins / chemistry
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Recombinant Fusion Proteins / pharmacology
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Recombinant Proteins / pharmacology
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TNF-Related Apoptosis-Inducing Ligand / pharmacology
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TNF-Related Apoptosis-Inducing Ligand / physiology*
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Tumor Necrosis Factor-alpha / chemistry
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Tumor Necrosis Factor-alpha / pharmacology
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Urinary Bladder Neoplasms / metabolism*
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Urinary Bladder Neoplasms / pathology
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Urothelium / cytology
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Urothelium / metabolism*
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p38 Mitogen-Activated Protein Kinases / metabolism
Substances
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CASP8 and FADD-Like Apoptosis Regulating Protein
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Cross-Linking Reagents
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His-TRAIL protein, recombinant
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Ligands
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Membrane Glycoproteins
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NF-kappa B
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Peptide Fragments
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Receptors, TNF-Related Apoptosis-Inducing Ligand
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Receptors, Tumor Necrosis Factor
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Recombinant Fusion Proteins
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Recombinant Proteins
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TNF-Related Apoptosis-Inducing Ligand
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TNFRSF10A protein, human
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TNFRSF10B protein, human
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Tumor Necrosis Factor-alpha
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p38 Mitogen-Activated Protein Kinases
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Caspases