Intraspecific Diversity of Microbial Anti-Inflammatory Molecule (MAM) from Faecalibacterium prausnitzii

• Published in: International journal of molecular sciences 2022-02, Vol.23 (3), p.1705
• Main Authors: Auger, Sandrine, Kropp, Camille, Borras-Nogues, Esther, Chanput, Wasaporn, Andre-Leroux, Gwenaelle, Gitton-Quent, Oscar, Benevides, Leandro, Breyner, Natalia, Azevedo, Vasco, Langella, Philippe, Chatel, Jean-Marc
• Format: Article
• Language: English
• Subjects: Animal models; Animals; Anti-inflammatory agents; Anti-Inflammatory Agents - therapeutic use; Bacterial Proteins - chemistry; Bacterial Proteins - genetics; Bacterial Proteins - therapeutic use; Bacteriology; Base Sequence; Binding sites; Biochemistry, Molecular Biology; Cluster analysis; Colitis; Colitis - drug therapy; Datasets; Faecalibacterium prausnitzii; Faecalibacterium prausnitzii - genetics; Faecalibacterium prausnitzii - metabolism; Genes; Genetic Variation; Genome, Bacterial; Genomes; In vivo methods and tests; Inflammatory diseases; Life Sciences; Male; Mice; Microbiology and Parasitology; Microorganisms; Phylogenetics; Phylogeny; Probiotics; Probiotics - therapeutic use; Proteins; Sequence Analysis, DNA
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms23031705

The commensal bacterium has unique anti-inflammatory properties, at least some of which have been attributed to its production of MAM, the Microbial Anti-inflammatory Molecule. Previous phylogenetic studies of strains have revealed the existence of various phylogroups. In this work, we address the question of whether MAMs from different phylogroups display distinct anti-inflammatory properties. We first performed wide-scale identification, classification, and phylogenetic analysis of MAM-like proteins encoded in different genomes of . When combined with a gene context analysis, this approach distinguished at least 10 distinct clusters of MAMs, providing evidence for functional diversity within this protein. We then selected 11 MAMs from various clusters and evaluated their anti-inflammatory capacities in vitro. A wide range of anti-inflammatory activity was detected. MAM from the M21/2 strain had the highest inhibitory effect (96% inhibition), while MAM from reference strain A2-165 demonstrated only 56% inhibition, and MAM from strain CNCM4541 was almost inactive. These results were confirmed in vivo in murine models of acute and chronic colitis. This study provides insights into the family of MAM proteins and generates clues regarding the choice of strains as probiotics for use in targeting chronic inflammatory diseases.