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The Pentose Phosphate Pathway in Immunotherapy
Rachel D Loo1, John Blazeck1,2,3,4,5
1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta GA, USA.
Journal of Leukocyte Biology
|August 3, 2026
Summary
The pentose phosphate pathway (PPP) is crucial for T cell function in cancer immunotherapy. Understanding its role in T cell metabolism can improve cancer treatments.
Area of Science:
- Immunology
- Cellular Metabolism
- Cancer Research
Background:
- Cellular metabolism significantly impacts cancer and T cell survival, particularly in adoptive cell immunotherapy.
- T cells utilize glycolysis for proliferation and effector functions, but the pentose phosphate pathway's (PPP) role is less understood.
- The PPP generates antioxidants and biosynthetic precursors, influencing cellular redox balance and biosynthesis.
Purpose of the Study:
- To review the pentose phosphate pathway's role in regulating T cell activation, redox balance, and antitumor function.
- To explore the PPP's differential effects on CD8+ and CD4+ T cell differentiation and antitumor responses.
- To discuss metabolic regulators of PPP enzymes and potential immunotherapy strategies.
Main Methods:
- Literature review of existing research on T cell metabolism and the pentose phosphate pathway.
- Analysis of the PPP's function in T cell activation, exhaustion, and differentiation.
- Synthesis of information on metabolic regulators and their impact on PPP enzyme expression.
Main Results:
- The PPP acts as a time-dependent regulator of T cell activation and redox balance.
- The PPP is associated with enhanced functional capacity in exhausted T cells.
- The PPP plays distinct roles in CD8+ and CD4+ T cell differentiation, influencing antitumor immunity.
- A link exists between the glycogen-PPP axis and CD8+ memory T cells.
Conclusions:
- The pentose phosphate pathway is a key regulator of T cell metabolism with significant implications for antitumor immunity.
- Targeting the PPP offers potential therapeutic strategies for enhancing adoptive cell immunotherapy.
- Further research into PPP regulation and its interplay with other metabolic pathways is warranted for optimizing cancer treatments.
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