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The CCR6-CCL20 axis promotes regulatory T cell glycolysis and immunosuppression in tumors.
The CCR6-CCL20 axis promotes regulatory T cell glycolysis and immunosuppression in tumors. Cancer immunology research Pant, A., Jain, A., Chen, Y., Patel, K., Saleh, L., Tzeng, S., Nitta, R. T., Zhao, L., Wu, C. Y., Bederson, M., Wang, W. L., Bergsneider, B. H., Choi, J., Medikonda, R., Verma, R., Cho, K. B., Kim, L. H., Kim, J. E., Yazigi, E., Lee, S. Y., Rajendran, S., Rajappa, P., Mackall, C. L., Li, G., Tyler, B., Brem, H., Pardoll, D. M., Lim, M., Jackson, C. M. 2024Abstract
Regulatory T cells (Tregs) are important players in the tumor microenvironment. However, the mechanisms behind their immunosuppressive effects are poorly understood. We found that CCR6-CCL20 activity in tumor-infiltrating Tregs is associated with greater glycolytic activity and ablation of Ccr6 reduced glycolysis and lactic acid production while increasing compensatory glutamine metabolism. Immunosuppressive activity towards CD8+ T cells was abrogated in Ccr6-/- Tregs due to reduction in activation-induced glycolysis. Furthermore, Ccr6-/- mice exhibited improved survival across multiple tumor models compared to wildtype mice, and Treg and CD8+ T-cell depletion abrogated the improvement. In addition, Ccr6 ablation further promoted the efficacy of anti-PD-1 therapy in a preclinical glioma model. Follow-up knockdown of Ccl20 with siRNA also demonstrated improvement in antitumor efficacy. Our results unveil CCR6 as a marker and regulator of Treg-induced immunosuppression and identify approaches to target the metabolic determinants of Treg immunosuppressive activity.
View details for DOI 10.1158/2326-6066.CIR-24-0230
View details for PubMedID 39133127