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Development of an

Marco Calvigioni1, Adelaide Panattoni1, Francesco Biagini2,3

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|June 8, 2023
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This summary is machine-generated.

Mucin-coated artificial gut models successfully mimic mucus-associated gut microbes. This advance enables better study of how factors like probiotics and drugs affect these crucial, specialized gut bacteria.

Keywords:
adhesiongut microbiotagut modelmucinsmucus

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Area of Science:

  • Microbiology
  • Gastroenterology
  • Biomaterials Science

Background:

  • The gut microbiota's mucus-associated layer differs significantly from the luminal community in composition and function.
  • Studying these specific microbial populations in vitro is challenging but crucial for understanding gut health.
  • Existing in vitro models often fail to adequately represent the mucus-adherent microbial niche.

Purpose of the Study:

  • To develop and validate an in vitro model that specifically supports and selects for mucus-associated gut microbial communities.
  • To investigate the role of mucins in shaping the composition of colonizing gut microbiota in a three-dimensional model.
  • To establish a reliable platform for studying the impact of external factors on mucus-adherent microbes.

Main Methods:

  • Utilized electrospun gelatin scaffolds, with and without mucin supplementation, as a three-dimensional in vitro gut model.
  • Inoculated scaffolds with human fecal samples to establish gut microbial biofilms.
  • Compared microbial adhesion, growth, community composition, and biodiversity over time between mucin-coated and non-coated scaffolds.

Main Results:

  • Both mucin-coated and non-coated scaffolds supported stable, long-term gut microbial biofilms with comparable bacterial loads and biodiversity.
  • Mucin-coated scaffolds demonstrated a significant enrichment of key mucosa-associated bacteria, including Akkermansia, Lactobacillus, and Faecalibacterium.
  • The model successfully selected for microorganisms known to adhere to the intestinal mucus layer in vivo.

Conclusions:

  • Mucins play a critical role in shaping intestinal microbial communities, even within artificial in vitro systems.
  • The developed in vitro model using mucin-coated electrospun gelatin structures is a valid tool for studying mucus-adhering microbial communities.
  • This model provides a promising platform for evaluating the effects of nutrients, probiotics, pathogens, and drugs on specific gut microbial populations.