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Related Concept Videos

Development of Human Microbiota01:30

Development of Human Microbiota

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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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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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Gut-Brain Axis01:22

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The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such...
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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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Microbiota of the Stomach and Small Intestine01:27

Microbiota of the Stomach and Small Intestine

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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 Urogenital Tract01:28

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The human urogenital system, once thought to be sterile in healthy individuals, is now recognized as a complex microbial habitat. Advancements in molecular sequencing techniques have revealed that even in healthy adults, the kidneys and bladder harbor microbial populations similar to those found in the distal urethra, albeit in much lower abundance. These resident microorganisms, while generally innocuous, can become opportunistic pathogens under conditions that alter the urogenital...
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Gut microbiota and aging.

Paul W O'Toole1, Ian B Jeffery2

  • 1School of Microbiology and APC Microbiome Institute, University College Cork, Cork T12 Y337, Ireland. pwotoole@ucc.ie.

Science (New York, N.Y.)
|January 20, 2016
PubMed
Summary
This summary is machine-generated.

The gut microbiota composition changes gradually with age, impacting immunity and cognition in older adults. Understanding these shifts is key for developing health surveillance strategies.

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Area of Science:

  • Gerontology
  • Microbiology
  • Immunology

Background:

  • The gut microbiota plays a crucial role in maintaining health, particularly in older individuals.
  • Microbiota alterations may influence aging-related conditions such as innate immunity decline, sarcopenia, and cognitive impairment, contributing to frailty.
  • Studies indicate differences in gut microbiota composition between older and younger adults, with changes occurring gradually over time.

Purpose of the Study:

  • To analyze the gut microbiota composition in older adults.
  • To identify associations between microbiota groups and factors like age, residential care, diet, and core microbiome retention.
  • To establish a framework for understanding microbiota-health relationships in aging and developing health surveillance tools.

Main Methods:

  • Utilized detailed analyses to categorize gut microbiota into distinct groups.
  • Investigated the relationship between these microbiota groups and aging-related factors.
  • Examined the connection between microbiota composition and clinical phenotypes in older individuals.

Main Results:

  • Identified specific gut microbiota groups associated with age, long-term care, diet, and core microbiome status.
  • Observed gradual changes in microbiota composition with aging, rather than abrupt shifts.
  • Began to elucidate how these microbiota changes relate to physiological aging processes and clinical outcomes.

Conclusions:

  • The gut microbiota undergoes gradual changes throughout the aging process.
  • These changes are linked to factors such as diet and lifestyle, and impact health conditions relevant to older adults.
  • The findings provide a foundation for distinguishing causal microbiota-health links and for developing microbiota-based health monitoring for the elderly.