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Updated: Jun 27, 2025

In Vivo Augmentation of Gut-Homing Regulatory T Cell Induction
Published on: January 22, 2020
Vitamin D regulates microbiome-dependent cancer immunity
Evangelos Giampazolias1,2, Mariana Pereira da Costa1, Khiem C Lam3
1Immunobiology Laboratory, The Francis Crick Institute, London NW1 1AT, UK.
Abstract:
A role for vitamin D in immune modulation and in cancer has been suggested. In this work, we report that mice with increased availability of vitamin D display greater immune-dependent resistance to transplantable cancers and augmented responses to checkpoint blockade immunotherapies. Similarly, in humans, vitamin D-induced genes correlate with improved responses to immune checkpoint inhibitor treatment as well as with immunity to cancer and increased overall survival. In mice, resistance is attributable to the activity of vitamin D on intestinal epithelial cells, which alters microbiome composition in favor of Bacteroides fragilis, which positively regulates cancer immunity. Our findings indicate a previously unappreciated connection between vitamin D, microbial commensal communities, and immune responses to cancer. Collectively, they highlight vitamin D levels as a potential determinant of cancer immunity and immunotherapy success.
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