title: Selective induction of apoptosis through the FADD/caspase-8 pathway by a p53 c-terminal peptide in human pre-malignant and malignant cells.
abstract: A p53 C-terminal peptide (aa 361-382, p53p), fused at its C-terminus to the minimal carrier peptide of antennapedia (17 aa, Ant; p53p-Ant), induced rapid apoptosis in human cancer cells, via activation of the Fas pathway. We examined p53p-Ant mechanism of action, toxicity in various human normal, non-malignant, pre-malignant and malignant cancer cells and investigated its biophysical characteristics. p53p-Ant selectively induced cell death in only pre-malignant or malignant cells in a p53-dependent manner and was not toxic to normal and non-malignant cells. p53p-Ant was more toxic to the mutant p53 than wild-type p53 phenotype in H1299 lung cancer cells stably expressing human temperature-sensitive p53 mutant 143Ala. Surface plasmon resonance (BIACORE) analysis demonstrated that this peptide had higher binding affinity to mutant p53 as compared to wild-type p53. p53p-Ant induced-cell death had the classical morphological characteristics of apoptosis and had no features of necrosis. The mechanism of cell death by p53p-Ant was through the FADD/caspase-8-dependent pathway without the involvement of the TRAIL pathway, Bcl-2 family and cell cycle changes. Blocking Fas with antibody did not alter the peptide's effect, suggesting that Fas itself did not interact with the peptide. Transfection with a dominant-negative FADD with a deleted N-terminus inhibited p53p-Ant-induced apoptosis. Its mechanism of action is related to the FADD-induced pathway without restoration of other p53 functions. p53p-Ant is a novel anticancer agent with unique selectivity for human cancer cells and could be useful as a prototype for the development of new anti-cancer agents.
authors.affiliation: Experimental Therapeutics Program, Division of Medical Oncology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY 10032, USA.
authors.forename: Yin
authors.initials: Y
authors.lastname: Li
authors.forename: Yuehua
authors.initials: Y
authors.lastname: Mao
authors.forename: Ramon V
authors.initials: RV
authors.lastname: Rosal
authors.forename: Richard D
authors.initials: RD
authors.lastname: Dinnen
authors.forename: Ann C
authors.initials: AC
authors.lastname: Williams
authors.forename: Paul W
authors.initials: PW
authors.lastname: Brandt-Rauf
authors.forename: Robert L
authors.initials: RL
authors.lastname: Fine
mesh_terms: D017209:Apoptosis; D051017:Apoptosis Regulatory Proteins; D029681:Arabidopsis Proteins / Q000378:metabolism*; D015153:Blotting, Western; D053181:Caspase 8; D020169:Caspases / Q000378:metabolism*; D045744:Cell Line, Tumor; D004305:Dose-Response Relationship, Drug; D004789:Enzyme Activation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D044943:Fatty Acid Desaturases / Q000378:metabolism*; D005434:Flow Cytometry / Q000379:methods; D005799:Genes, Dominant; D006801:Humans; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008562:Membrane Glycoproteins / Q000378:metabolism; D008856:Microscopy, Fluorescence; D009154:Mutation; D009336:Necrosis; D010455:Peptides / Q000737:chemistry; D010641:Phenotype; D010957:Plasmids / Q000378:metabolism; D011230:Precancerous Conditions; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000737:chemistry; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D020349:Surface Plasmon Resonance; D053221:TNF-Related Apoptosis-Inducing Ligand; D013696:Temperature; D013997:Time Factors; D014162:Transfection; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000737:chemistry* / Q000378:metabolism; D019014:fas Receptor / Q000378:metabolism
chemical_list: D051017:Apoptosis Regulatory Proteins; D029681:Arabidopsis Proteins; D004791:Enzyme Inhibitors; D008562:Membrane Glycoproteins; D010455:Peptides; D019253:Proto-Oncogene Proteins c-bcl-2; D053221:TNF-Related Apoptosis-Inducing Ligand; C505653:TNFSF10 protein, human; D014409:Tumor Necrosis Factor-alpha; D016159:Tumor Suppressor Protein p53; D019014:fas Receptor; D007770:L-Lactate Dehydrogenase; D044943:Fatty Acid Desaturases; C084083:Fad7 protein, Arabidopsis; C505530:CASP8 protein, human; D053181:Caspase 8; D020169:Caspases