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Related Concept Videos

Anatomy of the Intestines01:23

Anatomy of the Intestines

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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
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The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
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Bile01:19

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Bile is a crucial bodily fluid, characterized by its yellow-green color and alkaline nature. Produced in the liver, it is transported through the common hepatic duct into either the cystic duct, leading to the gallbladder, or directly into the common bile duct. The flow of bile is regulated by the sphincter of Oddi located at the entrance of the duodenum. When this sphincter is closed, bile is redirected to the gallbladder for storage and concentration.
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Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
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Related Experiment Video

Updated: May 27, 2025

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport
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Bile acid and microbiome interactions in the developing child.

Mary Elizabeth M Tessier1, Benjamin L Shneider1, Joseph F Petrosino2

  • 1Section of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Baylor College of Medicine/Texas Children's Hospital, Houston, Texas, USA.

Journal of Pediatric Gastroenterology and Nutrition
|February 17, 2025
PubMed
Summary
This summary is machine-generated.

The infant gut microbiome and bile acid pool mature over time, influencing pediatric liver disease. Understanding these interactions is key to developing new therapies for cholestatic liver conditions.

Keywords:
biliary atresiacholestasisenterohepatic circulationinfant

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Area of Science:

  • Gastroenterology and Hepatology
  • Microbiology
  • Pediatric Medicine

Background:

  • Bile acid metabolism and gut microbial composition differ significantly between infants and adults.
  • The infant gut microbiome evolves from a simple, Bifidobacterium-dominant community to a diverse, adult-like state.
  • This microbial succession impacts the maturation of the bile acid pool through microbial activities like deconjugation and oxidation.

Purpose of the Study:

  • To review the differences in the pediatric versus adult intestinal microbiome and bile acid pool.
  • To discuss the critical interactions between gut microbes and bile acids during early life.
  • To explore how these interactions impact outcomes in infants and children with cholestatic liver disease, such as biliary atresia.

Main Methods:

  • Literature review focusing on pediatric and adult gut microbiome and bile acid studies.
  • Comparative analysis of microbial succession and bile acid pool maturation in early life.
  • Exploration of the bidirectional relationship between the microbiome and bile acids in pediatric liver disease.

Main Results:

  • Infant gut microbiomes are initially simple, with a bile acid pool dominated by primary bile acids.
  • Microbial succession leads to increased microbial diversity and the generation of secondary bile acids.
  • Altered bile acid profiles can influence microbiome development, and vice versa, impacting liver health.

Conclusions:

  • The dynamic interplay between the gut microbiome and bile acids is crucial for normal development and health in children.
  • Dysregulation of this interaction is implicated in pediatric cholestatic liver diseases.
  • Further understanding of these mechanisms can inform novel therapeutic strategies for pediatric liver disorders.