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*
Schistosomiasis Immunology and Pathology Unit and
Max Planck Institut für Immunbiologie, Freiburg, Germany;
Department of Microbiology/Immunology, Cornell University, Ithaca, NY 14853;
Immunobiology Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892;
¶ Department of Biochemistry, University of Extremadura, Caceres, Spain; and
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Biomedical Research Institute, Rockville, MD 20852
Type 2 cytokines regulate fibrotic liver pathology in mice infected
with Schistosoma mansoni. Switching the immune response
to a type 1-dominant reaction has proven highly effective at reducing
the pathologic response. Activation of NOS-2 is critical, because type
1-deviated/NO synthase 2 (NOS-2)-deficient mice completely fail to
control their response. Here, we demonstrate the differential
regulation of NOS-2 and arginase type 1 (Arg-1) by type 1/type 2
cytokines in vivo and for the first time show a critical role for
arginase in the pathogenesis of schistosomiasis. Using
cytokine-deficient mice and two granuloma models, we show that
induction of Arg-1 is type 2 cytokine dependent. Schistosome eggs
induce Arg-1, while Mycobacterium avium-infected mice
develop a dominant NOS-2 response. IFN-
suppresses Arg-1 activity,
because type 1 polarized IL-4/IL-10-deficient, IL-4/IL-13-deficient,
and egg/IL-12-sensitized animals fail to up-regulate Arg-1 following
egg exposure. Notably, granuloma size decreases in these
type-1-deviated/Arg-1-unresponsive mice, suggesting an important
regulatory role for Arg-1 in schistosome egg-induced pathology. To test
this hypothesis, we administered difluoromethylornithine to block
ornithine-aminodecarboxylase, which uses the product of arginine
metabolism, L-ornithine, to generate polyamines.
Strikingly, granuloma size and hepatic fibrosis increased in the
ornithine-aminodecarboxylase-inhibited mice. Furthermore, we show that
type 2 cytokine-stimulated macrophages produce proline under strict
arginase control. Together, these data reveal an important regulatory
role for the arginase biosynthetic pathway in the regulation of
inflammation and demonstrate that differential activation of
Arg-1/NOS-2 is a critical determinant in the pathogenesis of granuloma
formation.
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S. El-Gayar, H. Thuring-Nahler, J. Pfeilschifter, M. Rollinghoff, and C. Bogdan Translational Control of Inducible Nitric Oxide Synthase by IL-13 and Arginine Availability in Inflammatory Macrophages J. Immunol., November 1, 2003; 171(9): 4561 - 4568. [Abstract] [Full Text] [PDF] |
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N. G. Sandler, M. M. Mentink-Kane, A. W. Cheever, and T. A. Wynn Global Gene Expression Profiles During Acute Pathogen-Induced Pulmonary Inflammation Reveal Divergent Roles for Th1 and Th2 Responses in Tissue Repair J. Immunol., October 1, 2003; 171(7): 3655 - 3667. [Abstract] [Full Text] [PDF] |
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A. C. La Flamme, K. Ruddenklau, and B. T. Backstrom Schistosomiasis Decreases Central Nervous System Inflammation and Alters the Progression of Experimental Autoimmune Encephalomyelitis Infect. Immun., September 1, 2003; 71(9): 4996 - 5004. [Abstract] [Full Text] [PDF] |
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P. C. Rodriguez, A. H. Zea, J. DeSalvo, K. S. Culotta, J. Zabaleta, D. G. Quiceno, J. B. Ochoa, and A. C. Ochoa L-Arginine Consumption by Macrophages Modulates the Expression of CD3{zeta} Chain in T Lymphocytes J. Immunol., August 1, 2003; 171(3): 1232 - 1239. [Abstract] [Full Text] [PDF] |
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Y. Liu, J. A. Van Ginderachter, L. Brys, P. De Baetselier, G. Raes, and A. B. Geldhof Nitric Oxide-Independent CTL Suppression during Tumor Progression: Association with Arginase-Producing (M2) Myeloid Cells J. Immunol., May 15, 2003; 170(10): 5064 - 5074. [Abstract] [Full Text] [PDF] |
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L. Martinez-Pomares, D. M. Reid, G. D. Brown, P. R. Taylor, R. J. Stillion, S. A. Linehan, S. Zamze, S. Gordon, and S. Y. C. Wong Analysis of mannose receptor regulation by IL-4, IL-10, and proteolytic processing using novel monoclonal antibodies J. Leukoc. Biol., May 1, 2003; 73(5): 604 - 613. [Abstract] [Full Text] [PDF] |
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M. G. Chiaramonte, M. Mentink-Kane, B. A. Jacobson, A. W. Cheever, M. J. Whitters, M. E.P. Goad, A. Wong, M. Collins, D. D. Donaldson, M. J. Grusby, et al. Regulation and Function of the Interleukin 13 Receptor {alpha} 2 During a T Helper Cell Type 2-dominant Immune Response J. Exp. Med., March 17, 2003; 197(6): 687 - 701. [Abstract] [Full Text] [PDF] |
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D. M. Mosser The many faces of macrophage activation J. Leukoc. Biol., February 1, 2003; 73(2): 209 - 212. [Full Text] [PDF] |
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C. Stempin, L. Giordanengo, S. Gea, and F. Cerban Alternative activation and increase of Trypanosoma cruzi survival in murine macrophages stimulated by cruzipain, a parasite antigen J. Leukoc. Biol., October 1, 2002; 72(4): 727 - 734. [Abstract] [Full Text] [PDF] |
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A. Mencacci, C. Montagnoli, A. Bacci, E. Cenci, L. Pitzurra, A. Spreca, M. Kopf, A. H. Sharpe, and L. Romani CD80+Gr-1+ Myeloid Cells Inhibit Development of Antifungal Th1 Immunity in Mice with Candidiasis J. Immunol., September 15, 2002; 169(6): 3180 - 3190. [Abstract] [Full Text] [PDF] |
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