Abstract
p53 acts as a tumor suppressor by inducing both growth arrest and apoptosis. p53-induced apoptosis can occur without new RNA synthesis through an unknown mechanism. In human vascular smooth muscle cells, p53 activation transiently increased surface Fas (CD95) expression by transport from the Golgi complex. Golgi disruption blocked both p53-induced surface Fas expression and apoptosis. p53 also induced Fas-FADD binding and transiently sensitized cells to Fas-induced apoptosis. In contrast, lpr and gld fibroblasts were resistant to p53-induced apoptosis. Thus, p53 can mediate apoptosis through Fas transport from cytoplasmic stores.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Adaptor Proteins, Signal Transducing*
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Animals
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Apoptosis* / drug effects
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Brefeldin A / pharmacology
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Carrier Proteins / metabolism
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Cell Membrane / metabolism*
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Cells, Cultured
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Enzyme Inhibitors / pharmacology
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Etoposide / pharmacology
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Fas Ligand Protein
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Fas-Associated Death Domain Protein
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Golgi Apparatus / metabolism
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Humans
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Membrane Glycoproteins / genetics
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Membrane Glycoproteins / metabolism
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Mice
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Muscle, Smooth, Vascular / cytology
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Mutation
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Protein Synthesis Inhibitors / pharmacology
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Rats
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Topoisomerase II Inhibitors
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Tumor Suppressor Protein p53 / physiology*
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fas Receptor / genetics
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fas Receptor / metabolism*
Substances
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Adaptor Proteins, Signal Transducing
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Carrier Proteins
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Enzyme Inhibitors
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FADD protein, human
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FASLG protein, human
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Fadd protein, mouse
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Fadd protein, rat
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Fas Ligand Protein
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Fas-Associated Death Domain Protein
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Fasl protein, mouse
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Faslg protein, rat
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Membrane Glycoproteins
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Protein Synthesis Inhibitors
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Topoisomerase II Inhibitors
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Tumor Suppressor Protein p53
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fas Receptor
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Brefeldin A
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Etoposide