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Updated: Jul 25, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
Published on: October 15, 2019
Gut microbiome and anticancer immune response: really hot Sh*t!
S Viaud1, R Daillère1, I G Boneca2
11] Institut National de la Santé et de la Recherche Médicale, U1015 INSERM, Gustave Roussy, Villejuif, France [2] Université Paris-Sud, Kremlin Bicêtre, France.
The gut microbiota influences cancer therapy efficacy. Chemotherapy increases gut permeability, promoting immune responses that aid tumor regression, but this effect is reduced in germ-free or antibiotic-treated mice.
Area of Science:
- Immunology
- Microbiology
- Oncology
Background:
- Gut microbiota plays a crucial role in modulating host immune responses.
- Chemotherapeutic agents can disrupt intestinal integrity, leading to bacterial translocation.
- This translocation can influence immune cell activity and anti-tumor responses.
Purpose of the Study:
- To investigate the impact of gut microbiota on the efficacy of cancer therapies.
- To understand the mechanisms by which gut bacteria influence host immune responses during chemotherapy.
Main Methods:
- Studies involving germ-free mice and antibiotic-treated animals.
- Analysis of immune cell populations (Th17, Th1) in lymphoid organs and tumor beds.
- Assessment of the redox equilibrium of myeloid cells within the tumor microenvironment.
Main Results:
- Chemotherapy-induced gut permeability facilitates bacterial translocation, priming Th17 responses.
- This leads to Th1 cell accumulation in tumors, promoting regression.
- Anticancer efficacy of cyclophosphamide and platinum salts is diminished in germ-free or antibiotic-treated mice, linked to microbiota disruption.
Conclusions:
- Gut microbiota is essential for the anti-cancer efficacy of certain chemotherapeutic agents.
- The findings highlight a paradigm shift, emphasizing host-microbe mutualism in cancer therapy.
- Targeting or modulating the gut microbiota could enhance cancer treatment outcomes.
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