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*
Biochemical Pharmacology, University of Konstanz, Konstanz, Germany; and
Institut für Mikrobiologie, Universitätsklinikum Charité, Medizinische Fakultät der Humboldt-Universität zu Berlin, Berlin, Germany
Exposure of macrophages to LPS induces a state of hyporesponsiveness to subsequent stimulation with LPS termed LPS desensitization or tolerance. To date, it is not known whether similar mechanisms of macrophage refractoriness are induced on contact with components of Gram-positive bacteria. In the present study, we demonstrate that pretreatment with highly purified lipoteichoic acid (LTA) results in suppression of cytokine release on restimulation with LTA in vitro and in vivo in both C3H/HeN and C3H/HeJ mice, but not in macrophages from Toll-like receptor (TLR)-2-deficient mice. Furthermore, desensitization in response to LPS or LTA exposure also inhibits responses to the other stimulus ("cross-tolerance"), suggesting that signaling pathways shared by TLR2 and TLR4 are impaired during tolerance. Finally, we show that LPS- or LTA-induced cross-tolerance is not transferred to hyporesponsive cells cocultured with LPS/LTA-responsive macrophages, showing that soluble mediators do not suffice for tolerance induction in neighboring cells.
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M. D. Lehner, F. Schwoebel, A. Kotlyarov, M. Leist, M. Gaestel, and T. Hartung Mitogen-Activated Protein Kinase-Activated Protein Kinase 2-Deficient Mice Show Increased Susceptibility to Listeria monocytogenes Infection J. Immunol., May 1, 2002; 168(9): 4667 - 4673. [Abstract] [Full Text] [PDF]
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A. S. Cross Invited review: Endotoxin tolerance -- current concepts in historical perspective Innate Immunity, April 1, 2002; 8(2): 83 - 98. [PDF]
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M. W. Hornef, T. Frisan, A. Vandewalle, S. Normark, and A. Richter-Dahlfors Toll-like Receptor 4 Resides in the Golgi Apparatus and Colocalizes with Internalized Lipopolysaccharide in Intestinal Epithelial Cells J. Exp. Med., February 25, 2002; 195(5): 559 - 570. [Abstract] [Full Text] [PDF]
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S. Morath, A. Geyer, I. Spreitzer, C. Hermann, and T. Hartung Structural Decomposition and Heterogeneity of Commercial Lipoteichoic Acid Preparations Infect. Immun., February 1, 2002; 70(2): 938 - 944. [Abstract] [Full Text] [PDF]
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Y. Asai, Y. Ohyama, K. Gen, and T. Ogawa Bacterial Fimbriae and Their Peptides Activate Human Gingival Epithelial Cells through Toll-Like Receptor 2 Infect. Immun., December 1, 2001; 69(12): 7387 - 7395. [Abstract] [Full Text] [PDF]
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M. Martin, J. Katz, S. N. Vogel, and S. M. Michalek Differential Induction of Endotoxin Tolerance by Lipopolysaccharides Derived from Porphyromonas gingivalis and Escherichia coli J. Immunol., November 1, 2001; 167(9): 5278 - 5285. [Abstract] [Full Text] [PDF]
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N. Kadowaki, S. Ho, S. Antonenko, R. de Waal Malefyt, R. A. Kastelein, F. Bazan, and Y.-J. Liu Subsets of Human Dendritic Cell Precursors Express Different Toll-like Receptors and Respond to Different Microbial Antigens J. Exp. Med., September 17, 2001; 194(6): 863 - 870. [Abstract] [Full Text] [PDF]
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A. E. Medvedev, P. Henneke, A. Schromm, E. Lien, R. Ingalls, M. J. Fenton, D. T. Golenbock, and S. N. Vogel Induction of Tolerance to Lipopolysaccharide and Mycobacterial Components in Chinese Hamster Ovary/CD14 Cells Is Not Affected by Overexpression of Toll-Like Receptors 2 or 4 J. Immunol., August 15, 2001; 167(4): 2257 - 2267. [Abstract] [Full Text] [PDF]
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