» Articles » PMID: 27117406

TNF-Mediated Restriction of Arginase 1 Expression in Myeloid Cells Triggers Type 2 NO Synthase Activity at the Site of Infection

Abstract

Neutralization or deletion of tumor necrosis factor (TNF) causes loss of control of intracellular pathogens in mice and humans, but the underlying mechanisms are incompletely understood. Here, we found that TNF antagonized alternative activation of macrophages and dendritic cells by IL-4. TNF inhibited IL-4-induced arginase 1 (Arg1) expression by decreasing histone acetylation, without affecting STAT6 phosphorylation and nuclear translocation. In Leishmania major-infected C57BL/6 wild-type mice, type 2 nitric oxide (NO) synthase (NOS2) was detected in inflammatory dendritic cells or macrophages, some of which co-expressed Arg1. In TNF-deficient mice, Arg1 was hyperexpressed, causing an impaired production of NO in situ. A similar phenotype was seen in L. major-infected BALB/c mice. Arg1 deletion in hematopoietic cells protected these mice from an otherwise lethal disease, although their disease-mediating T cell response (Th2, Treg) was maintained. Thus, deletion or TNF-mediated restriction of Arg1 unleashes the production of NO by NOS2, which is critical for pathogen control.

Citing Articles

Arginine metabolism in myeloid cells in health and disease.

Karadima E, Chavakis T, Alexaki V Semin Immunopathol. 2025; 47(1):11.

PMID: 39863828 PMC: 11762783. DOI: 10.1007/s00281-025-01038-9.


Unraveling the immunomodulatory and metabolic effects of bioactive glass S53P4 on macrophages in vitro.

Kajander K, Nowak N, Vaziri N, Vallittu P, Heino T, Maatta J J Mater Sci Mater Med. 2025; 36(1):13.

PMID: 39853555 PMC: 11762225. DOI: 10.1007/s10856-025-06861-y.


The intersection of host metabolism and immune responses to infection with kinetoplastid and apicomplexan parasites.

Ewald S, Nasuhidehnavi A, Feng T, Lesani M, McCall L Microbiol Mol Biol Rev. 2024; 88(1):e0016422.

PMID: 38299836 PMC: 10966954. DOI: 10.1128/mmbr.00164-22.


L-arginine metabolism inhibits arthritis and inflammatory bone loss.

Cao S, Li Y, Song R, Meng X, Fuchs M, Liang C Ann Rheum Dis. 2023; 83(1):72-87.

PMID: 37775153 PMC: 10803985. DOI: 10.1136/ard-2022-223626.


Dysregulated Arginine Metabolism Is Linked to Retinal Degeneration in Cep250 Knockout Mice.

Xiang L, Yang Q, Xie B, Zeng H, Ding L, Rao F Invest Ophthalmol Vis Sci. 2023; 64(12):2.

PMID: 37656476 PMC: 10479211. DOI: 10.1167/iovs.64.12.2.


References
1.
Kropf P, Fuentes J, Fahnrich E, Arpa L, Herath S, Weber V . Arginase and polyamine synthesis are key factors in the regulation of experimental leishmaniasis in vivo. FASEB J. 2005; 19(8):1000-2. DOI: 10.1096/fj.04-3416fje. View

2.
Rutschman R, Lang R, Hesse M, Ihle J, Wynn T, Murray P . Cutting edge: Stat6-dependent substrate depletion regulates nitric oxide production. J Immunol. 2001; 166(4):2173-7. DOI: 10.4049/jimmunol.166.4.2173. View

3.
Flynn J, GOLDSTEIN M, Chan J, Triebold K, Pfeffer K, Lowenstein C . Tumor necrosis factor-alpha is required in the protective immune response against Mycobacterium tuberculosis in mice. Immunity. 1995; 2(6):561-72. DOI: 10.1016/1074-7613(95)90001-2. View

4.
Creyghton M, Cheng A, Welstead G, Kooistra T, Carey B, Steine E . Histone H3K27ac separates active from poised enhancers and predicts developmental state. Proc Natl Acad Sci U S A. 2010; 107(50):21931-6. PMC: 3003124. DOI: 10.1073/pnas.1016071107. View

5.
Allman W, Dey R, Liu L, Siddiqui S, Coleman A, Bhattacharya P . TACI deficiency leads to alternatively activated macrophage phenotype and susceptibility to Leishmania infection. Proc Natl Acad Sci U S A. 2015; 112(30):E4094-103. PMC: 4522803. DOI: 10.1073/pnas.1421580112. View