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Peroxiredoxin 1 Contributes to Host Defenses against Mycobacterium tuberculosis
Kazunori Matsumura1, Hiroki Iwai1, Masako Kato-Miyazawa1
1Department of Infectious Diseases, Research Institute, National Center for Global Health and Medicine, Shinjuku, Tokyo 162-8655, Japan.
Abstract:
Peroxiredoxin (PRDX)1 is an antioxidant that detoxifies hydrogen peroxide and peroxinitrite. Compared with wild-type (WT) mice, Prdx1-deficient (Prdx1-/-) mice showed increased susceptibility to Mycobacterium tuberculosis and lower levels of IFN-γ and IFN-γ-producing CD4+ T cells in the lungs after M. tuberculosis infection. IL-12 production, c-Rel induction, and p38 MAPK activation levels were lower in Prdx1-/- than in WT bone marrow-derived macrophages (BMDMs). IFN-γ-activated Prdx1-/- BMDMs did not kill M. tubercuosis effectively. NO production levels were lower, and arginase activity and arginase 1 (Arg1) expression levels were higher, in IFN-γ-activated Prdx1-/- than in WT BMDMs after M. tuberculosis infection. An arginase inhibitor, Nω-hydroxy-nor-arginine, restored antimicrobial activity and NO production in IFN-γ-activated Prdx1-/- BMDMs after M. tuberculosis infection. These results suggest that PRDX1 contributes to host defenses against M. tuberculosis PRDX1 positively regulates IL-12 production by inducing c-Rel and activating p38 MAPK, and it positively regulates NO production by suppressing Arg1 expression in macrophages infected with M. tuberculosis.
Insights
Peroxiredoxin-1 (PRDX1) is crucial for fighting tuberculosis. Its absence in mice increases susceptibility and impairs macrophage responses, highlighting PRDX1's role in host defense.
Area of Science:
- Immunology
- Microbiology
- Biochemistry
Background:
- Peroxiredoxin-1 (PRDX1) is an antioxidant enzyme involved in cellular defense mechanisms.
- Tuberculosis (TB) remains a significant global health challenge, necessitating a deeper understanding of host-pathogen interactions.
- The role of PRDX1 in the innate immune response to Mycobacterium tuberculosis (M.tb) infection is not fully elucidated.
Purpose of the Study:
- To investigate the role of Peroxiredoxin-1 (PRDX1) in host defense against Mycobacterium tuberculosis (M.tb) infection.
- To elucidate the mechanisms by which PRDX1 influences macrophage function during M.tb infection.
Main Methods:
- Comparison of wild-type (WT) and Prdx1-deficient (Prdx1-/-) mice and their responses to M.tb infection.
- Analysis of immune cell populations (e.g., CD4+ T cells) and cytokine production (e.g., IFN-γ, IL-12) in lung tissues.
- Assessment of macrophage activation markers, including c-Rel induction, p38 MAPK activation, nitric oxide (NO) production, and arginase activity/expression in bone marrow-derived macrophages (BMDMs).
- Evaluation of the effect of an arginase inhibitor on antimicrobial activity.
Main Results:
- Prdx1-/- mice exhibited increased susceptibility to M.tb infection, with lower levels of IFN-γ and IFN-γ-producing CD4+ T cells in the lungs.
- IL-12 production, c-Rel induction, and p38 MAPK activation were reduced in Prdx1-/- BMDMs.
- IFN-γ-activated Prdx1-/- BMDMs showed impaired killing of M.tb, lower NO production, and higher arginase activity and Arginase 1 (Arg1) expression compared to WT BMDMs.
- Inhibition of arginase restored antimicrobial activity and NO production in IFN-γ-activated Prdx1-/- BMDMs.
Conclusions:
- PRDX1 plays a critical role in host defense against M.tb infection.
- PRDX1 positively regulates IL-12 production via c-Rel and p38 MAPK pathways.
- PRDX1 enhances macrophage antimicrobial activity by suppressing Arg1 expression and promoting NO production.
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