Fn-Dps, a novel virulence factor of Fusobacterium nucleatum, disrupts erythrocytes and promotes metastasis in colorectal cancer Original paper
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Divine Aleru
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Divine Aleru
Read MoreI am a biochemist with a deep curiosity for the human microbiome and how it shapes human health, and I enjoy making microbiome science more accessible through research and writing. With 2 years experience in microbiome research, I have curated microbiome studies, analyzed microbial signatures, and now focus on interventions as a Microbiome Signatures and Interventions Research Coordinator.
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Microbes
Microbes
Microbes are microscopic organisms living in and on the human body, shaping health through digestion, vitamin production, and immune protection. When microbial balance is disrupted, disease can occur. This guide explains key microbe types—bacteria, viruses, fungi, protozoa, and archaea—plus major pathogenic and beneficial examples.
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Divine Aleru
Read More
Researched by:
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Divine Aleru
ID
Divine Aleru
Read More
Microbiome Signatures identifies and validates condition-specific microbiome shifts and interventions to accelerate clinical translation. Our multidisciplinary team supports clinicians, researchers, and innovators in turning microbiome science into actionable medicine.
Divine Aleru
What was studied?
This study investigates Fusobacterium nucleatum and its novel virulence factor, Fn-Dps, which contributes to colorectal cancer (CRC) metastasis and disruption of erythrocytes. The research explored the molecular mechanisms of Fn-Dps, including its interaction with macrophages, the induction of epithelial-mesenchymal transition (EMT) in CRC cells, and its role in promoting CRC metastasis in vivo.
Who was studied?
The study examined various cell types, including colorectal cancer cell lines (CT26, RKO), macrophage cell lines (RAW264.7, J774A.1, THP-1), and BALB/c mice used in metastasis models. Human serum samples from healthy subjects and CRC patients were also analyzed to assess antibody responses to Fn-Dps.
What were the most important findings?
The key discovery of this study is that Fn-Dps, a protein secreted by Fusobacterium nucleatum, plays a significant role in CRC metastasis. Fn-Dps was found to disrupt erythrocytes, promote the migration of CRC cells, and enhance metastasis through its interaction with macrophages, particularly by upregulating the chemokines CCL2 and CCL7. This upregulation triggers EMT in CRC cells, aiding their migratory behavior. Additionally, Fn-Dps increased the survival and replication of F. nucleatum within macrophages, contributing to the persistence of the bacterium in the tumor microenvironment. The study also highlighted that mucosal immunization with Fn-Dps conferred protection against F. nucleatum colonization in the intestinal tract. Moreover, elevated levels of anti-Fn-Dps antibodies were found in CRC patients, particularly in more advanced stages of the disease, suggesting a potential biomarker for CRC diagnosis and prognosis. In animal models, Fn-Dps treatment led to increased metastatic spread in the lungs and liver, confirming its role in promoting tumor dissemination.
What are the greatest implications of this study?
The findings from this study offer valuable insights into the role of Fusobacterium nucleatum and its protein Fn-Dps in CRC metastasis. Fn-Dps contributes to both immune modulation and the promotion of metastatic behaviors in CRC cells. These results suggest that targeting Fn-Dps could offer a novel therapeutic strategy for managing CRC metastasis and potentially improving patient outcomes. Moreover, the study’s identification of anti-Fn-Dps antibodies as a potential biomarker could aid in the development of diagnostic tools for early CRC detection, as well as monitoring disease progression. The study also suggests that vaccines targeting Fn-Dps could serve as a preventive or therapeutic measure against F. nucleatum infections in CRC.
Fusobacterium nucleatum
Fusobacterium nucleatum is a Gram-negative, anaerobic bacterium commonly found in the oral cavity, where it plays a crucial role in the formation of biofilms. Beyond its presence in the mouth, Fn is implicated in a variety of systemic conditions, including periodontal disease, colorectal cancer, and inflammatory bowel disease. Known for its ability to coaggregate with other bacteria, Fn's pathogenic potential is magnified in dysbiotic microbial communities, making it a key player in polymicrobial infections. The bacterium utilizes multiple virulence factors such as FadA and Fap2, which facilitate adhesion to host tissues and immune evasion, ultimately contributing to its role in chronic and inflammatory diseases.