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Hickey A, Stamou P, Udayan S, Ramón-Vázquez A, Esteban-Torres M, Bottacini F, Woznicki JA, Hughes O, Melgar S, Ventura M, Van Sinderen D, Rossini V, Nally K. Bifidobacterium breve Exopolysaccharide Blocks Dendritic Cell Maturation and Activation of CD4 + T Cells. Front Microbiol 2021; 12:653587. [PMID: 34220742 PMCID: PMC8242212 DOI: 10.3389/fmicb.2021.653587] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 05/11/2021] [Indexed: 11/17/2022] Open
Abstract
Exopolysaccharide (EPS) is a bacterial extracellular carbohydrate moiety which has been associated with immunomodulatory activity and host protective effects of several gut commensal bacteria. Bifidobacterium breve are early colonizers of the human gastrointestinal tract (GIT) but the role of EPS in mediating their effects on the host has not been investigated for many strains. Here, we characterized EPS production by a panel of human B. breve isolates and investigated the effect of EPS status on host immune responses using human and murine cell culture-based assay systems. We report that B. breve EPS production is heterogenous across strains and that immune responses in human THP-1 monocytes are strain-specific, but not EPS status-specific. Using wild type and isogenic EPS deficient mutants of B. breve strains UCC2003 and JCM7017 we show that EPS had strain-specific divergent effects on cytokine responses from murine bone marrow derived macrophages (BMDMs) and dendritic cells (BMDCs). The B. breve UCC2003 EPS negative (EPS–) strain increased expression of cytokine genes (Tnfa, Il6, Il12a, and Il23a) relative to untreated BMDCs and BMDCs treated with wild type strain. B. breve UCC2003 and JCM7017 EPS– strains increased expression of dendritic cell (DC) activation and maturation marker genes (Cd80, Cd83, and Cd86) relative to untreated BMDCs. Consistent with this, BMDCs co-cultured with B. breve UCC2003 and JCM7017 EPS– strains engineered to express OVA antigen activated OVA-specific OT-II CD4+ T-cells in a co-culture antigen-presentation assay while EPS proficient strains did not. Collectively, these data indicate that B. breve EPS proficient strains use EPS to prevent maturation of DCs and activation of antigen specific CD4+ T cells responses to B. breve. This study identifies a new immunomodulatory role for B. breve EPS and suggests it may be important for immune evasion of adaptive immunity by B. breve and contribute to host-microbe mutualism.
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Affiliation(s)
- Ana Hickey
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland
| | | | - Sreeram Udayan
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland
| | | | - Maria Esteban-Torres
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,School of Microbiology, University College Cork, Cork, Ireland
| | - Francesca Bottacini
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,School of Microbiology, University College Cork, Cork, Ireland
| | | | - Owen Hughes
- Luminex Corporation, Austin, TX, United States
| | - Silvia Melgar
- APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - Marco Ventura
- Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - Douwe Van Sinderen
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,School of Microbiology, University College Cork, Cork, Ireland
| | - Valerio Rossini
- APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - Ken Nally
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland
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Püngel D, Treveil A, Dalby MJ, Caim S, Colquhoun IJ, Booth C, Ketskemety J, Korcsmaros T, van Sinderen D, Lawson MAE, Hall LJ. Bifidobacterium breve UCC2003 Exopolysaccharide Modulates the Early Life Microbiota by Acting as a Potential Dietary Substrate. Nutrients 2020; 12:E948. [PMID: 32235410 PMCID: PMC7231044 DOI: 10.3390/nu12040948] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 03/20/2020] [Accepted: 03/27/2020] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Bifidobacterium represents an important early life microbiota member. Specific bifidobacterial components, exopolysaccharides (EPS), positively modulate host responses, with purified EPS also suggested to impact microbe-microbe interactions by acting as a nutrient substrate. Thus, we determined the longitudinal effects of bifidobacterial EPS on microbial communities and metabolite profiles using an infant model colon system. METHODS Differential gene expression and growth characteristics were determined for each strain; Bifidobacterium breve UCC2003 and corresponding isogenic EPS-deletion mutant (B. breve UCC2003del). Model colon vessels were inoculated with B. breve and microbiome dynamics monitored using 16S rRNA sequencing and metabolomics (NMR). RESULTS Transcriptomics of EPS mutant vs. B. breve UCC2003 highlighted discrete differential gene expression (e.g., eps biosynthetic cluster), though overall growth dynamics between strains were unaffected. The EPS-positive vessel had significant shifts in microbiome and metabolite profiles until study end (405 h); with increases of Tyzzerella and Faecalibacterium, and short-chain fatty acids, with further correlations between taxa and metabolites which were not observed within the EPS-negative vessel. CONCLUSIONS These data indicate that B. breve UCC2003 EPS is potentially metabolized by infant microbiota members, leading to differential microbial metabolism and altered metabolite by-products. Overall, these findings may allow development of EPS-specific strategies to promote infant health.
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Affiliation(s)
- Deborah Püngel
- Gut Microbes & Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich NR4 7UQ, UK; (D.P.); (A.T.); (M.J.D.); (S.C.); (J.K.); (T.K.)
| | - Agatha Treveil
- Gut Microbes & Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich NR4 7UQ, UK; (D.P.); (A.T.); (M.J.D.); (S.C.); (J.K.); (T.K.)
- Earlham Institute, Norwich NR4 7UZ, UK
| | - Matthew J Dalby
- Gut Microbes & Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich NR4 7UQ, UK; (D.P.); (A.T.); (M.J.D.); (S.C.); (J.K.); (T.K.)
| | - Shabhonam Caim
- Gut Microbes & Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich NR4 7UQ, UK; (D.P.); (A.T.); (M.J.D.); (S.C.); (J.K.); (T.K.)
| | - Ian J Colquhoun
- Analytical Sciences, Quadram Institute Bioscience, Norwich NR4 7UQ, UK; (I.J.C.); (C.B.)
| | - Catherine Booth
- Analytical Sciences, Quadram Institute Bioscience, Norwich NR4 7UQ, UK; (I.J.C.); (C.B.)
| | - Jennifer Ketskemety
- Gut Microbes & Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich NR4 7UQ, UK; (D.P.); (A.T.); (M.J.D.); (S.C.); (J.K.); (T.K.)
| | - Tamas Korcsmaros
- Gut Microbes & Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich NR4 7UQ, UK; (D.P.); (A.T.); (M.J.D.); (S.C.); (J.K.); (T.K.)
- Earlham Institute, Norwich NR4 7UZ, UK
| | - Douwe van Sinderen
- APC Microbiome Institute, University College Cork, T12 K8AF Cork, Ireland;
| | - Melissa AE Lawson
- Gut Microbes & Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich NR4 7UQ, UK; (D.P.); (A.T.); (M.J.D.); (S.C.); (J.K.); (T.K.)
- Lydia Becker Institute for Immunology and Inflammation, Wellcome Trust Centre for Cell Matrix Research, Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester M13 9PL, UK
| | - Lindsay J Hall
- Gut Microbes & Health Institute Strategic Programme, Quadram Institute Bioscience, Norwich NR4 7UQ, UK; (D.P.); (A.T.); (M.J.D.); (S.C.); (J.K.); (T.K.)
- Norwich Medical School, University of East Anglia, Norwich NR4 7TJ, UK
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