Abstract
Background
Spermidine suppress oxidative stress and is involved in various disease pathogenesis including ulcerative colitis (UC). Arginase 2 (ARG2) plays a central role in the synthesis of spermidine. This study aimed to clarify the effect of endogenously produced spermidine on colitis.
Methods
The physiological role of ARG2 and spermidine was investigated using Arg2-deficient mice with reduced spermidine. Immunohistochemical staining of the rectum was used to analyze ARG2 expression and spermidine levels in healthy controls and UC patients.
Results
In mice with dextran sulfate sodium-induced colitis, ARG2 and spermidine levels were increased in the rectal epithelium. Spermidine protects colonic epithelial cells from oxidative stress and Arg2 knockdown cells reduced antioxidant activity. Organoids cultured from the small intestine and colon of Arg2-deficient mice both were more susceptible to oxidative stress. Colitis was exacerbated in Arg2-deficient mice compared to wild-type mice. Supplementation with spermidine result in comparable severity of colitis in both wild-type and Arg2-deficient mice. In the active phase of UC, rectal ARG2 expression and spermidine accumulation were increased compared to remission. ARG2 and spermidine levels were similar in healthy controls and UC remission patients.
Conclusions
ARG2 produces spermidine endogenously in the intestinal epithelium and has a palliative effect on ulcerative colitis. ARG2 and spermidine are potential novel therapeutic targets for UC.
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Abbreviations
- ARG2:
-
Arginase 2
- DAPI:
-
4,6-Diamino-2-phenylindole
- DSS:
-
Dextran sulfate sodium
- GCL:
-
Glutamate–cysteine ligase
- GCLC:
-
Glutamate–cysteine ligase catalytic subunit
- GCLM:
-
Glutamate–cysteine ligase modifier subunit
- HDAC2:
-
Histone deacetylase 2
- HE:
-
Hematoxylin–eosin
- HO-1:
-
Heme oxygenase-1
- H2O2 :
-
Hydrogen peroxide
- IBD:
-
Inflammatory bowel disease
- KO:
-
Knockout
- LPS:
-
Lipopolysaccharide
- NQO1:
-
Nicotinamide quinone oxidoreductase 1
- NRF2:
-
Nuclear factor erythroid 2-related factor 2
- PCR:
-
Polymerase chain reaction
- ROS:
-
Reactive oxygen species
- SPD:
-
Spermidine
- TNFα:
-
Tumor necrosis factor-α
- TXNR:
-
Thioredoxin reductase 1
- UC:
-
Ulcerative colitis
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Acknowledgements
The authors appreciate the technical support from the Research Support Center, Graduate School of Medical Sciences, Kyushu University. The authors also thank Mr. M. Munakata and Mrs. M Tanaka at the Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University for assistance with histology. The authors thank Ellen Knapp, PhD, from Edanz Group (https://jp.edanz.com/ac) for editing a draft of this manuscript. The authors acknowledge BioRender.com to create graphic abstract.
Funding
This work was supported by JSPS KAKENHI [Grant No. JP21K06783] and a Grant-in-Aid for Scientific Research C.
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NI, and TT conceived the idea of the study. NI, AY, SK, T. Nitahata, YU, SA, and TT were involved in providing guidance on the animal experiments and data analysis. JU, KK, SF, YF, YM, T. Nagasue, TM, YT, and TT collected the clinical samples and contributed to interpretation of the data. TK, YO, and TT contributed to drafting of the manuscript and critical revision. All authors revised the manuscript, approved the manuscript to be published, and agreed to be accountable for all aspects of the work.
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Imazu, N., Torisu, T., Yokote, A. et al. Arginase 2 attenuates ulcerative colitis by antioxidant effects of spermidine. J Gastroenterol (2024). https://doi.org/10.1007/s00535-024-02104-z
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DOI: https://doi.org/10.1007/s00535-024-02104-z