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Inulin-type fructan fermentation by bifidobacteria depends on the strain rather than the species and region in the human intestine

  • Applied microbial and cell physiology
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Abstract

Inulin-type fructans (ITF) are known to cause a health-promoting bifidogenic effect, although the ITF degradation capacity of bifidobacteria in different intestinal regions remains unclear. The present study aims at offering new insights into this link, making use of a collection of 190 bifidobacterial strains, encompassing strains from gut biopsies (terminal ileum and proximal colon; mucosa-associated strains) and the simulator of the human intestinal microbial ecosystem (SHIME®; proximal and distal colon vessels; lumen-associated strains). A multivariate data analysis of all fermentation data revealed four clusters corresponding with different types of ITF degradation fingerprints, which were not correlated with the region in the intestine, suggesting that the degradation of ITF is uniform along the human intestine. Strains from cluster 1 consumed fructose, while strains from cluster 2 consumed more oligofructose than fructose. Higher fructose and oligofructose consumption was characteristic for clusters 3 and 4 strains, which degraded inulin too. In general, the mucosa-associated strains from biopsy origin seemed to be more specialized in the consumption of fructose and oligofructose, while the lumen-associated strains from SHIME origin displayed a higher degradation degree of inulin. Further, intra-species variability in ITF degradation was found, indicating strain-specific variations. The coexistence of different bifidobacterial strains with different ITF degradation fingerprints within the same intestinal region suggests cooperation for the degradation of ITF, with opportunities for cross-feeding on strain and/or species level.

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Acknowledgments

The authors acknowledge their financial support of the Research Council of the Vrije Universiteit Brussel (SRP, IRP, and IOF projects), the Research Foundation Flanders (FWO-Vlaanderen), and the Hercules Foundation. MS is the recipient of a PhD fellowship of the Vrije Universiteit Brussel in the framework of a bilateral agreement with the University of Ljubljana. AR and FM were the recipients of a PhD fellowship of the FWO-Vlaanderen.

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Correspondence to Luc De Vuyst.

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The authors declare that they have no conflict of interest.

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Selak, M., Rivière, A., Moens, F. et al. Inulin-type fructan fermentation by bifidobacteria depends on the strain rather than the species and region in the human intestine. Appl Microbiol Biotechnol 100, 4097–4107 (2016). https://doi.org/10.1007/s00253-016-7351-9

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  • DOI: https://doi.org/10.1007/s00253-016-7351-9

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