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. 2023 Aug 14;41(8):1450-1465.e8.
doi: 10.1016/j.ccell.2023.06.011. Epub 2023 Jul 20.

Carnobacterium maltaromaticum boosts intestinal vitamin D production to suppress colorectal cancer in female mice

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Carnobacterium maltaromaticum boosts intestinal vitamin D production to suppress colorectal cancer in female mice

Qing Li et al. Cancer Cell. .
Free article

Abstract

Carnobacterium maltaromaticum was found to be specifically depleted in female patients with colorectal cancer (CRC). Administration of C. maltaromaticum reduces intestinal tumor formation in two murine CRC models in a female-specific manner. Estrogen increases the attachment and colonization of C. maltaromaticum via increasing the colonic expression of SLC3A2 that binds to DD-CPase of this bacterium. Metabolomic and transcriptomic profiling unveils the increased gut abundance of vitamin D-related metabolites and the mucosal activation of vitamin D receptor (VDR) signaling in C. maltaromaticum-gavaged mice in a gut microbiome- and VDR-dependent manner. In vitro fermentation system confirms the metabolic cross-feeding of C. maltaromaticum with Faecalibacterium prausnitzii to convert C. maltaromaticum-produced 7-dehydrocholesterol into vitamin D for activating the host VDR signaling. Overall, C. maltaromaticum colonizes the gut in an estrogen-dependent manner and acts along with other microbes to augment the intestinal vitamin D production to activate the host VDR for suppressing CRC.

Keywords: 7-DHC; VDR; colon cancer; estrogen; probiotics.

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Conflict of interest statement

Declaration of interests Jun Yu, William Ka Kei Wu, and Qing Li are holders of the provisional patent "Probiotic compositions for treating and preventing colorectal cancer" (US17/881,498). The authors declare no other competing interests.

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