Abstract
We have previously reported that NF-kappa B and stimulating factor 1 elements within the proximal mouse Toll-like receptor 2 (TLR2) promoter region are required for the transcriptional activation of TLR2 expression following infection with Mycobacterium avium. In the present study, we found that a rapid increase in both DNase I sensitivity and restriction enzyme accessibility at the TLR2 promoter region occurred following infection with M. avium. Increase in restriction enzyme accessibility at the TLR2 promoter region covering the NF-kappa B and stimulating factor 1 elements was associated with the induction of TLR2 expression at the mRNA level. Furthermore, the increase in restriction enzyme accessibility at the TLR2 promoter region did not appear to result from binding of NF-kappa B, but rather depended on a TLR2-myeloid differentiation factor 88 signaling pathway. Together our results indicate that chromatin remodeling occurs at TLR2 promoter region following infection with M. avium, allowing the access of transcription factors to initiate the transcription of TLR2.
Publication types
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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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Antigens, Differentiation / physiology
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Cells, Cultured
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Chromatin / immunology*
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Chromatin / metabolism*
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DNA Restriction Enzymes / metabolism
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Deoxyribonuclease EcoRI / metabolism
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Deoxyribonuclease I / metabolism
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Deoxyribonucleases, Type II Site-Specific / metabolism
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Drosophila Proteins*
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Gene Expression Regulation / immunology
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Macrophages / enzymology
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Macrophages / immunology
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Macrophages / metabolism*
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Macrophages / microbiology*
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Membrane Glycoproteins / biosynthesis
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Membrane Glycoproteins / genetics*
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Membrane Glycoproteins / metabolism*
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Membrane Glycoproteins / physiology
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Mice
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Mice, Inbred C57BL
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Mice, Knockout
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Mycobacterium avium / immunology*
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Myeloid Differentiation Factor 88
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NF-kappa B / metabolism
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Promoter Regions, Genetic / immunology*
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Protein Binding / immunology
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Receptors, Cell Surface / biosynthesis
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Receptors, Cell Surface / genetics*
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Receptors, Cell Surface / metabolism*
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Receptors, Cell Surface / physiology
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Receptors, Immunologic / physiology
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Toll-Like Receptor 2
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Toll-Like Receptors
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Tumor Cells, Cultured
Substances
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Adaptor Proteins, Signal Transducing
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Antigens, Differentiation
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Chromatin
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Drosophila Proteins
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Membrane Glycoproteins
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Myd88 protein, mouse
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Myeloid Differentiation Factor 88
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NF-kappa B
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Receptors, Cell Surface
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Receptors, Immunologic
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Toll-Like Receptor 2
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Toll-Like Receptors
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DNA Restriction Enzymes
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Deoxyribonuclease EcoRI
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endodeoxyribonuclease HaeII
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Deoxyribonuclease I
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Deoxyribonucleases, Type II Site-Specific