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Microbiota of the Respiratory Tract01:29

Microbiota of the Respiratory Tract

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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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Microbiota of the Stomach and Small Intestine01:27

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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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Development of Human Microbiota01:30

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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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Introduction to the Human Microbiota01:22

Introduction to the Human Microbiota

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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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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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Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
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[Intestinal microorganisms and allergic diseases].

Fengling Yang, Yu Zhao

    Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi = Journal of Clinical Otorhinolaryngology Head and Neck Surgery
    |September 5, 2014
    PubMed
    Summary

    The hygiene hypothesis suggests gut microbes impact immune homeostasis, influencing allergic disease development. Understanding these gut microbiome-immune interactions may lead to new allergy treatments.

    Area of Science:

    • Microbiology
    • Immunology
    • Allergology

    Context:

    • The 'hygiene hypothesis' proposes a link between reduced microbial exposure and increased allergic diseases.
    • Intestinal microbes play a crucial role in regulating both local immune status and systemic immune homeostasis.
    • Alterations in gut microbiota composition are increasingly implicated in the pathogenesis of allergic conditions.

    Purpose:

    • To investigate the complex relationships among intestinal microbes, the immune system, and allergic diseases.
    • To explore how factors influencing gut microorganisms impact immune homeostasis and allergy risk.
    • To provide a foundation for developing novel therapeutic interventions for allergic diseases.

    Summary:

    • This review examines the intricate connections between the gut microbiome, immune system function, and the development of allergic diseases.

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  • It highlights how environmental and lifestyle factors affecting gut microbial communities can disrupt immune balance, potentially leading to allergies.
  • The interplay between intestinal microbes and immune homeostasis is presented as a key factor in allergic disease pathogenesis.
  • Impact:

    • Findings may elucidate the mechanisms underlying the hygiene hypothesis in relation to allergies.
    • Understanding the gut microbiome's role in immune regulation could identify novel biomarkers for allergy risk.
    • This research could inform the development of microbiome-targeted strategies for preventing and treating allergic diseases.