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Microbiota of the Large Intestine01:27

Microbiota of the Large Intestine

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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 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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Functions of the Gut Microbiota01:18

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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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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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The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from...
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Introduction to the Human Microbiota01:22

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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,...
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Intestinal microbiota in liver disease.

Tanvir R Haque1, A Sidney Barritt1

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The gut microbiota influences liver health and disease. This review explores how altering the intestinal microbiota (gut bacteria) offers potential therapies for liver conditions like fatty liver disease and cirrhosis.

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Area of Science:

  • Gastroenterology and Hepatology
  • Microbiology
  • Immunology

Background:

  • The liver acts as a primary filter for intestinal contents, including nutrients, toxins, and bacterial metabolites.
  • Growing evidence highlights the intricate interplay between the gut, liver, and immune system in maintaining liver homeostasis and disease pathogenesis.

Purpose of the Study:

  • To review the contribution of intestinal microbiota to liver health.
  • To examine the role of gut dysbiosis in liver diseases such as alcoholic and non-alcoholic fatty liver disease, cirrhosis, and hepatocellular carcinoma.
  • To discuss therapeutic strategies involving microbiota modulation.

Main Methods:

  • Literature review of studies investigating the gut-liver axis.
  • Analysis of research on dysbiosis in various liver pathologies.
  • Synthesis of findings on therapeutic interventions targeting the intestinal microbiota.

Main Results:

  • Intestinal microbiota plays a crucial role in liver homeostasis.
  • Gut dysbiosis is implicated in the development and progression of diverse liver diseases.
  • Modulating the gut microbiota shows therapeutic promise for liver conditions.

Conclusions:

  • The gut microbiota is integral to liver health and disease.
  • Targeting the intestinal microbiota represents a promising therapeutic avenue for liver disorders.
  • Further research into the gut-liver axis and microbiota manipulation is warranted.