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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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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 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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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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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 Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
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Microbiome and its impact on gastrointestinal atopy.

A B Muir1,2, A J Benitez3, K Dods1

  • 1Division of Gastroenterology, Hepatology, and Nutrition, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.

Allergy
|May 31, 2016
PubMed
Summary

The gut microbiome influences allergic diseases like asthma and food allergies. Understanding its role may help treat eosinophilic gastrointestinal diseases (EGIDs), such as eosinophilic esophagitis (EoE).

Keywords:
asthmaatopic dermatitisbacteriaeosinophileosinophilic esophagitis

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Area of Science:

  • Immunology
  • Microbiology
  • Gastroenterology

Background:

  • Allergic conditions are rising in Westernized nations.
  • Gut microbiome dysbiosis is implicated in allergic disease development.
  • Factors like genetics, environment, and diet impact gut microbiota and immune homeostasis.

Purpose of the Study:

  • To review the role of the gut microbiome in atopic conditions.
  • To explore the development of immune tolerance from molecular and clinical perspectives.
  • To investigate the potential application of this knowledge to eosinophilic gastrointestinal diseases (EGIDs), particularly eosinophilic esophagitis (EoE).

Main Methods:

  • Literature review of murine and human studies.
  • Analysis of molecular and clinical data on immune tolerance.
  • Examination of gut microbiome's role in atopic diseases.

Main Results:

  • Studies confirm the microbiota's role in asthma, atopic dermatitis, and food allergies.
  • The microbiome's function in EGIDs remains largely unknown.
  • Current research focuses on understanding tolerance mechanisms.

Conclusions:

  • The gut microbiome is crucial in allergic disease pathogenesis.
  • Further research is needed to elucidate the microbiome's role in EGIDs.
  • Knowledge of the microbiome may lead to novel strategies for EGID prevention and treatment.