Abstract
We reported that arginase 2 (ARG2) deletion results in increased gastritis and decreased bacterial burden during Helicobacter pylori infection in mice. Our studies implicated a potential role for inducible nitric oxide (NO) synthase (NOS2), as Arg2 −/− mice exhibited increased NOS2 levels in gastric macrophages, and NO can kill H. pylori. We now bred Arg2 −/− to Nos2 −/− mice, and infected them with H. pylori. Compared to wild-type mice, both Arg2 −/− and Arg2 −/− ;Nos2 −/− mice exhibited increased gastritis and decreased colonization, the latter indicating that the effect of ARG2 deletion on bacterial burden was not mediated by NO. While Arg2 −/− mice demonstrated enhanced M1 macrophage activation, Nos2 −/− and Arg2 −/− ;Nos2 −/− mice did not demonstrate these changes, but exhibited increased CXCL1 and CXCL2 responses. There was an increased expression of the Th1/Th17 cytokines, interferon gamma and interleukin 17, in gastric tissues and splenic T-cells from Arg2 −/−, but not Nos2 −/− or Arg2 −/− ;Nos2 −/− mice. Gastric tissues from infected Arg2 −/− mice demonstrated increased expression of arginase 1, ornithine decarboxylase, adenosylmethionine decarboxylase 1, spermidine/spermine N 1-acetyltransferase 1, and spermine oxidase, along with increased spermine levels. These data indicate that ARG2 deletion results in compensatory upregulation of gastric polyamine synthesis and catabolism during H. pylori infection, which may contribute to increased gastric inflammation and associated decreased bacterial load. Overall, the finding of this study is that ARG2 contributes to the immune evasion of H. pylori by restricting M1 macrophage activation and polyamine metabolism.
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Abbreviations
- AMD1:
-
Adenosylmethionine decarboxylase 1
- ARG1:
-
Arginase 1; arginase, type I
- ARG2:
-
Arginase 2; arginase, type II
- CCL:
-
C–C chemokine ligand
- CD:
-
Cluster of differentiation
- CHIA1:
-
Chitinase, acidic 1
- CXCL:
-
C–X–C chemokine ligand
- FPL:
-
French-pressed lysate
- IFN-γ:
-
Interferon gamma
- IL:
-
Interleukin
- M-CSF:
-
Macrophage colony stimulating factor
- MOI:
-
Multiplicity of infection
- NO:
-
Nitric oxide
- NOS2:
-
Nitric oxide synthase 2; inducible nitric oxide synthase
- ODC:
-
Ornithine decarboxylase
- PMSS1:
-
Pre-mouse Sydney Strain 1
- RT-PCR:
-
Real-time polymerase chain reaction
- RETNLA:
-
Resistin like molecule alpha
- SAT1:
-
Spermidine/spermine N 1-acetyltransferase 1
- SMOX:
-
Spermine oxidase
- SS1:
-
Sydney Strain 1
- TGF:
-
Transforming growth factor
- Th:
-
T helper
- TNF:
-
Tumor necrosis factor
- TNFSF14:
-
Tumor necrosis factor superfamily member 14
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Acknowledgments
We thank Alain P. Gobert (Vanderbilt University) for intellectual input and for his review of the manuscript. We thank Daniel P. Barry (Vanderbilt University) for his assistance with the breeding and maintenance of the mouse colonies utilized in this study. We thank Margaret Allaman (Vanderbilt University) for her assistance with the Luminex assays.
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This work was funded by NIH Grants R01DK053620, R01AT004821, R01CA190612, P01CA116087, and P01CA028842 (K.T.W.), Merit Review Grant I01BX001453 from the United States Department of Veterans Affairs Biomedical Laboratory R&D (BLRD) Service (K.T.W.), the Vanderbilt Digestive Disease Research Center, supported by NIH Grant P30DK058404, the Thomas F. Frist Sr. Endowment (K.T.W.), and the Vanderbilt Center for Mucosal Inflammation and Cancer (K.T.W.). D.M.H. was supported by NIH Grants T32GM008554 and F31DK10715.
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The authors declare that no conflict of interest exists.
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Hardbower, D.M., Asim, M., Murray-Stewart, T. et al. Arginase 2 deletion leads to enhanced M1 macrophage activation and upregulated polyamine metabolism in response to Helicobacter pylori infection. Amino Acids 48, 2375–2388 (2016). https://doi.org/10.1007/s00726-016-2231-2
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DOI: https://doi.org/10.1007/s00726-016-2231-2