Abstract
The nematode Caenorhabditis elegans is proving to be an attractive model organism for investigating innate immune responses to infection. Among the known pathogens of C. elegans is the bacterium Microbacterium nematophilum, which adheres to the nematode rectum and postanal cuticle, inducing swelling of the underlying hypodermal tissue and causing mild constipation. We find that on infection by M. nematophilum, an extracellular signal-regulated kinase (ERK) mitogen-activated protein (MAP) kinase cascade mediates tail swelling and protects C. elegans from severe constipation, which would otherwise arrest development and cause sterility. Involvement in pathogen defense represents a new role for ERK MAP kinase signaling in this organism.
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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Actinomycetales / immunology
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Actinomycetales / physiology*
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Animals
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Animals, Genetically Modified
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Caenorhabditis elegans / immunology*
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Caenorhabditis elegans / metabolism
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Caenorhabditis elegans / microbiology
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Constipation / immunology
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Constipation / microbiology
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Gene Expression*
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Heat-Shock Proteins / metabolism
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MAP Kinase Kinase Kinase 2
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MAP Kinase Kinase Kinases / metabolism
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Mitogen-Activated Protein Kinases / metabolism*
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Plasmids / genetics
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Plasmids / metabolism
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Rectum / immunology*
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Rectum / microbiology
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Signal Transduction / immunology*
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Tail / physiopathology
Substances
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Heat-Shock Proteins
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Mitogen-Activated Protein Kinases
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MAP Kinase Kinase Kinase 2
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MAP Kinase Kinase Kinases