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The arginine metabolism and its deprivation in cancer therapy
Tiejun Feng1, Fuda Xie2, Yang Lyu1
1Department of Anatomical and Cellular Pathology, State Key Laboratory of Translational Oncology, Sir Y.K. Pao Cancer Center, Prince of Wales Hospital, The Chinese University of Hong Kong, China.
Abstract:
Arginine deprivation has emerged as a promising therapeutic strategy in cancer treatment due to the auxotrophy of certain tumors. Many cancers, such as pancreatic, colorectal, and hepatocellular carcinoma, exhibit downregulated argininosuccinate synthetase, making them reliant on external arginine sources. This dependency allows targeted therapies that deplete arginine, inhibiting tumor growth while sparing normal cells. Arginine is crucial for various cellular processes, including protein synthesis and immune function. Its deprivation affects both tumor metabolism and immune responses, potentially enhancing cancer therapy. Studies have explored using enzymes like arginine deiminase and arginase, often modified for increased stability and reduced immunogenicity, to effectively lower arginine levels in the tumor microenvironment. These approaches show promise, particularly in tumors with low argininosuccinate synthetase expression. However, the impact on immune cells and the potential for resistance highlight the need for further research. Combining arginine deprivation with other treatments might improve outcomes, offering a novel approach to combat arginine-dependent cancers.
Insights
Arginine deprivation targets cancers auxotrophic for this amino acid, like pancreatic and liver cancers. Depleting arginine inhibits tumor growth by exploiting cancer cell dependency, offering a novel therapeutic strategy.
Area of Science:
- Oncology
- Biochemistry
- Immunology
Background:
- Certain cancers, including pancreatic, colorectal, and hepatocellular carcinoma, exhibit auxotrophy due to downregulated argininosuccinate synthetase.
- This metabolic dependency makes these tumors reliant on external arginine for survival and proliferation.
- Arginine is vital for protein synthesis and immune function, making its deprivation a potential anti-cancer strategy.
Purpose of the Study:
- To explore arginine deprivation as a targeted cancer therapy.
- To investigate the mechanisms by which arginine depletion affects tumor growth and the tumor microenvironment.
- To evaluate the potential of enzymes like arginine deiminase and arginase in cancer treatment.
Main Methods:
- Review of studies utilizing arginine-depleting enzymes (arginine deiminase, arginase) in preclinical models.
- Analysis of the impact of arginine deprivation on tumor cell metabolism and immune responses.
- Examination of modified enzyme formulations for enhanced stability and reduced immunogenicity.
Main Results:
- Arginine deprivation effectively inhibits the growth of arginine-dependent tumors.
- Enzymatic depletion of arginine lowers levels in the tumor microenvironment, impacting tumor metabolism.
- Modified enzymes show promise for stable and effective arginine depletion.
Conclusions:
- Arginine deprivation is a promising therapeutic strategy for cancers with low argininosuccinate synthetase expression.
- Further research is needed to understand the impact on immune cells and potential resistance mechanisms.
- Combination therapies involving arginine deprivation may enhance treatment outcomes for arginine-dependent cancers.
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