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Related Concept Videos

Introduction to the Human Microbiota01:22

Introduction to the Human Microbiota

Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity, and disease...
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The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...

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Related Experiment Video

Updated: Jun 13, 2026

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Intestinal interstitial fluid isolation provides novel insight into the human host-microbiome interface.

Ellen G Avery1,2,3,4,5, Lea-Maxie Haag6,7, Victoria McParland1,2,3

  • 1Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.

Cardiovascular Research
|January 13, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed new methods to collect intestinal interstitial fluid (IF) and measure gut metabolites and immune signals directly at their site of action. This provides unprecedented insight into the gut

Keywords:
Fluid isolationHumansInterstitial fluidIntestinal microenvironmentIntestineMicrobiomeRodents

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Area of Science:

  • Gastroenterology and Microbiology
  • Human Physiology
  • Biotechnology

Background:

  • The gastrointestinal (GI) tract's distinct regions have unique microbial communities and physiological features.
  • Gut microbes act as an endocrine organ, producing metabolites that influence host immunity and cardiovascular health.
  • Understanding the segment-specific mucosal microenvironment, reflected in interstitial fluid (IF), is crucial but challenging due to limited tools.

Purpose of the Study:

  • To develop and validate novel methods for collecting intestinal interstitial fluid (IF) from specific GI segments.
  • To enable direct quantification of microbiota-derived metabolites, cytokines, and proteins within the IF.
  • To investigate segment-specific differences in the gut mucosal microenvironment in rodents and humans.

Main Methods:

  • Developed tissue centrifugation and elution techniques to isolate IF from different intestinal segments.
  • Validated these methods in rodent models (rats and mice).
  • Translated the tissue elution method for human sample collection and analysis.

Main Results:

  • Quantified microbiota-derived metabolites, cytokines, and proteins directly within the IF.
  • Observed enrichment of short-chain fatty acids in colonic IF.
  • Detected segment-specific differential abundances of metabolites and cytokines in IF, often higher than in plasma.
  • Proteomics identified site-specific extracellular proteins in IF.
  • Demonstrated higher ileal IL-1β levels in IF compared to plasma following lipopolysaccharide challenge in rats.

Conclusions:

  • Novel methods allow direct IF collection and mediator measurement from defined intestinal segments.
  • This approach bypasses limitations of indirect analyses (fecal/serum samples).
  • Provides direct insights into the understudied gut interstitial fluid compartment and its role in host-microbe interactions.