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Mono-association of mice with non-cultivable, intestinal, segmented, filamentous bacteria
H L Klaasen1, J P Koopman, M E Van den Brink
1Central Animal Laboratory, Catholic University, Nijmegen, The Netherlands.
Abstract:
A technique is described so that mice mono-associated with non-cultivable, segmented filamentous bacteria (SFB's) can be produced for the first time. As SFB donors, mice were used which had an intestinal microflora consisting of both SFB's and bacteria of the genus Clostridium. Recipients were germ-free mice. It was demonstrated that the intraileal inoculation method was more effective than the orogastric route. Therefore, intestinal homogenates of donor mice were treated with filtered ethanol, diluted and administered intraileally to recipient mice. Evidence is presented that cage mates of the recipient mice were mono-associated with SFB's. The availability of these animals, i.e. in vivo monocultures of SFB's, allows taxonomic and functional characterization of SFB's, which was as yet not possible.
Insights
Researchers developed a new method to produce mice exclusively colonized by segmented filamentous bacteria (SFB). This breakthrough enables the study of these previously unculturable gut microbes in a controlled environment.
Area of Science:
- Microbiology
- Gastroenterology
- Animal Models
Background:
- Segmented filamentous bacteria (SFB) are a unique component of the gut microbiota, known to influence host immunity.
- SFB are notoriously difficult to culture in vitro, hindering detailed study.
- Previous research lacked methods for isolating SFB in a pure culture within a host.
Purpose of the Study:
- To establish a reliable method for generating mice mono-associated with SFB.
- To enable further research into the taxonomic and functional roles of SFB.
- To overcome the limitations of studying SFB in complex microbial communities.
Main Methods:
- Utilized donor mice with a mixed intestinal flora including SFB and Clostridium species.
- Developed an intraileal inoculation technique using filtered, diluted intestinal homogenates.
- Administered the prepared homogenates to germ-free recipient mice.
Main Results:
- Successfully achieved mono-association of recipient mice with SFB.
- Demonstrated the intraileal route to be more effective than orogastric inoculation.
- Observed successful transmission to cage mates, indicating robust colonization.
Conclusions:
- A novel technique for producing SFB mono-associated mice has been established.
- This method provides a critical tool for the in vivo characterization of SFB.
- Future research can now focus on the specific functions and taxonomy of SFB.