Propionibacterium acnes-metabolites inhibit experimental lung metastasis of murine sarcoma L-1 in BALB/c-mice
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1Institut für Medizinische Mikrobiologie und Hygiene der Universität, Köln, Germany.
Abstract:
Adhesive interactions between tumor cells and host tissue occur at several stages of metastasis. Such interactions might be inhibited by microbial metabolites resembling the binding regions of matrix molecules. Certain metabolite sequences including Gly, Asp, Arg, and Ser (GAAS) proved to be critical for cell interactions, e.g. with fibronectin. In vitro, the rosette formation of murine pulmonary cells and sarcoma L-1 cells decreased significantly in the presence of Propionibacterium acnes-metabolites rich in GAAS. In vivo, coinjection of Propionibacterium acnes-metabolites and sarcoma L-1 cells significantly inhibited the formation of lung colonies in BALB/c mice. The inhibition of lung colonization by these metabolites appeared to be noncytotoxic and obviously did not result from impairment of cellular tumorigenicity.
Insights
Microbial metabolites containing Gly, Asp, Arg, and Ser (GAAS) sequences can inhibit tumor cell metastasis. Propionibacterium acnes metabolites rich in GAAS reduced lung colony formation in mice without harming tumor cells.
Area of Science:
- Microbiology
- Cancer Biology
- Biochemistry
Background:
- Tumor cell adhesion to host tissues is crucial for metastasis.
- Microbial metabolites may interfere with these adhesive interactions.
- Specific amino acid sequences, like Gly-Asp-Arg-Ser (GAAS), are implicated in cell binding to matrix molecules such as fibronectin.
Purpose of the Study:
- To investigate the potential of microbial metabolites to inhibit tumor cell metastasis.
- To determine if metabolites rich in GAAS can impede tumor cell adhesion and colonization.
- To assess the mechanism of inhibition, specifically whether it is cytotoxic or affects tumorigenicity.
Main Methods:
- In vitro studies using murine pulmonary cells and sarcoma L-1 cells to observe rosette formation in the presence of Propionibacterium acnes metabolites.
- In vivo experiments involving coinjection of Propionibacterium acnes metabolites and sarcoma L-1 cells into BALB/c mice to evaluate lung colony formation.
- Assessment of metabolite effects on cell viability and tumor cell tumorigenicity.
Main Results:
- Propionibacterium acnes metabolites significantly reduced in vitro rosette formation between tumor cells and pulmonary cells.
- In vivo, coinjection of these metabolites with sarcoma L-1 cells markedly inhibited lung colony formation in mice.
- The observed inhibition of lung colonization was noncytotoxic and did not impair the inherent tumorigenicity of the cancer cells.
Conclusions:
- Microbial metabolites, particularly those rich in GAAS sequences, show promise as inhibitors of tumor cell metastasis.
- These metabolites interfere with the adhesive interactions essential for metastasis without directly killing tumor cells.
- Further research into these metabolites could lead to novel, non-cytotoxic anti-metastatic therapies.