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Bacterial Flora of the Large Intestine01:29

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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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The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more...
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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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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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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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Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures
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Microbiota keep the intestinal clock ticking.

Jorge Henao-Mejia1, Till Strowig, Richard A Flavell

  • 1Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06520, USA.

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Summary
This summary is machine-generated.

Commensal bacteria play a surprising role in the daily circadian regulation of glucocorticoid production. This finding highlights the gut microbiome

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Area of Science:

  • Microbiology
  • Endocrinology
  • Chronobiology

Background:

  • Daily metabolic patterns are typically regulated by the hypothalamic axis.
  • The circadian system influences numerous physiological processes.

Discussion:

  • Commensal bacteria influence circadian rhythms.
  • Gut microbes regulate glucocorticoid production in intestinal cells.

Key Insights:

  • Commensal bacteria are involved in the circadian regulation of glucocorticoid production.
  • Intestinal epithelial cells' glucocorticoid production is modulated by gut bacteria.

Outlook:

  • Further research into the gut microbiome's role in circadian rhythms.
  • Exploring therapeutic potential of targeting gut bacteria for metabolic disorders.