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Related Concept Videos

Microbiota of the Respiratory Tract01:29

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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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Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
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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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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 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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Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
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A novel microbiota stratification system predicts future exacerbations in bronchiectasis.

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Stratifying non-cystic fibrosis bronchiectasis patients by dominant airway bacteria, like Pseudomonas aeruginosa or Haemophilus influenzae, offers better clinical insight than standard methods. This approach improves understanding of disease severity and exacerbation risk.

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Area of Science:

  • Respiratory Medicine
  • Microbiology
  • Genomics

Background:

  • Airway microbiota composition correlates with clinical measures in non-cystic fibrosis bronchiectasis (NCFB).
  • Current data offers limited prognostic value at the individual patient level.
  • Clinical application of microbiota data requires translational advancement.

Purpose of the Study:

  • To determine if stratifying NCFB patients by predominant microbiota taxon improves clinical insight over standard diagnostics.
  • To assess the prognostic value of distinct microbial community structures in NCFB.

Main Methods:

  • Induced sputum from 107 adult NCFB patients analyzed via culture, quantitative PCR, and ribosomal gene pyrosequencing.
  • Prospective analysis of 42 patients.
  • Correlation of microbiological data with concurrent clinical measures and subsequent outcomes.

Main Results:

  • Three dominant microbiota groups identified: Pseudomonas aeruginosa (n=26), Haemophilus influenzae (n=34), and others (n=36).
  • P. aeruginosa and H. influenzae-dominated groups showed worse lung function, elevated C-reactive protein (CRP), IL-8, and IL-1β.
  • P. aeruginosa predominance predicted future exacerbations, while H. influenzae dominance correlated with fewer episodes.

Conclusions:

  • Stratification by predominant bacterial taxa in NCFB provides superior clinical information compared to conventional culture or qPCR.
  • Further research is needed to elucidate the mechanistic basis of these observed associations.