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Microbiota of the Large Intestine01:27

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The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...
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The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
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Acute diarrhea, a common gastrointestinal disturbance, is characterized by the rapid evacuation of fluid stools, leading to an excessive weight in fluid. This condition typically arises from disorders affecting intestinal water and electrolyte transport. It can be triggered by an increased osmotic load within the intestine, excessive secretion of electrolytes and water, mucosal exudation of protein and fluid, or altered intestinal motility. The primary risks of acute diarrhea are dehydration...
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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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Drug–drug interactions can precipitate toxicity through multiple mechanisms. Absorption interactions alter how drugs enter the body, exemplified when ranitidine increases the absorption of basic drugs, while cholestyramine decreases the levels of propranolol. Protein binding interactions occur when drugs share the same binding sites on plasma proteins. Drugs like aspirin and warfarin, when bound in excess, can lead to increased free drug concentrations, enhancing the potential for...
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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.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
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Xenobiotics: Interaction with the Intestinal Microflora.

Kun Lu1, Ridwan Mahbub1, James G Fox1

  • 1Kun Lu, PhD, is an Assistant Professor in the Department of Environmental Health Science at the University of Georgia, Athens, Georgia. Ridwan Mahbub, BSA, MS, was a graduate student in the laboratory of Dr. Kun Lu at University of Georgia, Athens, Georgia. James G. Fox, DVM, is currently Professor and Director of the Division of Comparative Medicine at the Massachusetts Institute of Technology, Cambridge, Massachusetts.

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PubMed
Summary
This summary is machine-generated.

The gut microbiome, crucial for health, interacts with xenobiotics (foreign compounds). These interactions impact microbiome structure, function, and xenobiotic transformation, influencing disease development.

Keywords:
gut microbiomeinteractionxenobiotics

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Area of Science:

  • Microbiology
  • Toxicology
  • Human Health

Background:

  • The human body hosts trillions of gut microbes, significantly outnumbering human cells and possessing vast genetic diversity.
  • The gut microbiota plays vital roles in metabolism, immunity, digestion, and maintaining gut health.
  • Dysregulation of the gut microbiome is linked to various diseases, including metabolic disorders, inflammatory conditions, and allergies.

Purpose of the Study:

  • To review the emerging evidence on the interplay between xenobiotics and the gut microbiome.
  • To elucidate how xenobiotics influence gut microbiome structure and function.
  • To explore the biotransformation of xenobiotics by the gut microbiome.

Main Methods:

  • Literature review of scientific articles focusing on xenobiotics and gut microbiome interactions.
  • Analysis of studies investigating the impact of xenobiotics on microbial composition and metabolic activity.
  • Synthesis of findings on xenobiotic metabolism by gut microbial communities.

Main Results:

  • Xenobiotics can alter the composition and diversity of the gut microbiome.
  • Exposure to xenobiotics can lead to functional changes in microbial metabolic pathways.
  • The gut microbiome actively biotransforms various xenobiotics, influencing their toxicity and host response.

Conclusions:

  • The gut microbiome is a critical factor in mediating xenobiotic toxicity and disease.
  • Understanding these interactions is essential for predicting and mitigating chemical-induced health risks.
  • Further research into xenobiotic-microbiome crosstalk can inform therapeutic strategies.