Abstract
In addition to promoting cell survival, neurotrophins also can elicit apoptosis in restricted cell types. Recent results indicate that nerve growth factor (NGF) can induce Schwann cell death via engagement of the p75 neurotrophin receptor. Here we describe a novel interaction between the p75 receptor and receptor-interacting protein 2, RIP2 (RICK/CARDIAK), that accounts for the ability of neurotrophins to choose between a survival-versus-death pathway. RIP2, an adaptor protein with a serine threonine kinase and a caspase recruitment domain (CARD), is highly expressed in dissociated Schwann cells and displays an endogenous association with p75. RIP2 binds to the death domain of p75 via its CARD domain in an NGF-dependent manner. The introduction of RIP2 into Schwann cells deficient in RIP2 conferred NGF-dependent nuclear transcription factor-kappaB (NF-kappaB) activity and decreased the cell death induced by NGF. Conversely, the expression of a dominant-negative version of RIP2 protein resulted in a loss of NGF-induced NF-kappaB induction and increased NGF-mediated cell death. These results indicate that adaptor proteins like RIP2 can provide a bifunctional switch for cell survival or cell death decisions mediated by the p75 neurotrophin receptor.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Activating Transcription Factor 2
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Animals
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Apoptosis / physiology
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Blotting, Western
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Caspases / metabolism*
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Cell Survival / drug effects
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Cell Survival / physiology
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Cells, Cultured
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Cyclic AMP Response Element-Binding Protein / metabolism
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Genes, Dominant
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Glutathione Transferase / genetics
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Green Fluorescent Proteins
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Humans
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Kidney / cytology
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Kidney / metabolism
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Ligands
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Luminescent Proteins / genetics
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NF-kappa B / metabolism
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Nerve Growth Factor / pharmacology
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Protein Binding / physiology
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Protein Serine-Threonine Kinases / deficiency
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Protein Serine-Threonine Kinases / genetics
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Protein Serine-Threonine Kinases / metabolism*
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Protein Structure, Tertiary / physiology
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Proteins / genetics
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Proteins / metabolism
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Rats
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Receptor, Nerve Growth Factor
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Receptor-Interacting Protein Serine-Threonine Kinase 2
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Receptor-Interacting Protein Serine-Threonine Kinases
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Receptors, Nerve Growth Factor / genetics
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Receptors, Nerve Growth Factor / metabolism*
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Recombinant Fusion Proteins / genetics
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Recombinant Fusion Proteins / metabolism
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Schwann Cells / cytology
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Schwann Cells / drug effects
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Schwann Cells / metabolism
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TNF Receptor-Associated Factor 6
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Transcription Factors / metabolism
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Transfection
Substances
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Activating Transcription Factor 2
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Cyclic AMP Response Element-Binding Protein
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Ligands
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Luminescent Proteins
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NF-kappa B
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Proteins
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Receptor, Nerve Growth Factor
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Receptors, Nerve Growth Factor
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Recombinant Fusion Proteins
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TNF Receptor-Associated Factor 6
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Transcription Factors
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Green Fluorescent Proteins
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Nerve Growth Factor
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Glutathione Transferase
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Protein Serine-Threonine Kinases
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RIPK1 protein, human
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RIPK2 protein, human
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Receptor-Interacting Protein Serine-Threonine Kinase 2
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Receptor-Interacting Protein Serine-Threonine Kinases
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Caspases