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Related Concept Videos

Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin, triggering...

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Looking Outwards: Isolation of Cyanobacterial Released Carbohydrate Polymers and Proteins
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WITHDRAWN: Exopolysaccharide from Bifidobacterium longum subsp. infantis E4: Structural analysis and immunoregulation

Yuqi Wang1, Yingxue Yue2, Le Wang2

  • 1Food College, Northeast Agricultural University, Harbin 150030, China; Heilongjiang Jinxiang Biochemical Co., LTD, Harbin 150030, China.

International Journal of Biological Macromolecules
|March 30, 2025
PubMed
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Exopolysaccharides (EPS) from microbial sources demonstrate significant immunomodulatory effects. These compounds, EPS-1 and EPS-2, were found to enhance immune responses in mice, suggesting their potential as immune-boosting agents.

Keywords:
BifidobacteriumExopolysaccharideImmunoregulationStructural characterization

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Area of Science:

  • Biochemistry
  • Immunology
  • Microbiology

Background:

  • Exopolysaccharides (EPS) are known for their anti-inflammatory, antimicrobial, and immunomodulatory properties.
  • Understanding the structural characteristics of EPS is crucial for elucidating their biological functions.

Purpose of the Study:

  • To characterize the structures of EPS-1 and EPS-2.
  • To investigate the immunomodulatory effects of EPS-1 and EPS-2 on cyclophosphamide (CTX)-induced immunocompromised mice.

Main Methods:

  • Structural analysis using Fourier-transform infrared (FT-IR) spectroscopy, Congo red test, methylation, and nuclear magnetic resonance (NMR).
  • Assessment of immune function in CTX-induced immunocompromised mice, including spleen and thymus indices, splenic lymphocyte proliferation, NK cell activity, T cell populations (Th1, Th2, Th17, Treg), and serum inflammatory cytokine levels (IFN-γ, IL-1β, IL-2, IL-6, IL-10, TNF-α).

Main Results:

  • EPS-1 primarily comprised glucose and mannose, while EPS-2 consisted mainly of galactose, glucose, and mannose.
  • Both EPS-1 and EPS-2 exhibited triple-helical conformations and alleviated the decrease in spleen and thymus indices in CTX-treated mice.
  • EPS administration significantly increased splenic lymphocyte proliferation, NK cell activity, Th1, Th2, Th17, and Treg cell populations, and elevated serum inflammatory cytokine levels compared to the model control group.

Conclusions:

  • EPS-1 and EPS-2 possess distinct structural features, including specific glycosidic linkages and triple-helical conformations.
  • EPS-1 and EPS-2 demonstrate significant immunomodulatory potential by enhancing cellular and humoral immunity in a mouse model of immunosuppression.
  • These findings highlight the therapeutic potential of EPS as agents for regulating and boosting immune function.