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Related Concept Videos

Asthma-II: Pathophysiology and Classification01:26

Asthma-II: Pathophysiology and Classification

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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.
Additionally, environmental and genetic factors play crucial roles in determining an individual's susceptibility to asthma and the severity of their condition.
Critical processes in asthma pathophysiology include:
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Asthma-I: Introduction01:29

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Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
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Asthma: Pathogenesis and Management01:20

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Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
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Author Spotlight: Exploring the Role of Inflammation in the Co-occurrence of Primary Sjogren's Syndrome and Lung Adenocarcinoma
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Sputum transcriptomics implicates increased p38 signalling activity in severe asthma.

Katherine J Baines1,2,3, Michael Fricker1,2,3,4, Vanessa M McDonald1,2,4

  • 1Priority Research Centre for Asthma and Respiratory Diseases, University of Newcastle, Newcastle, NSW, Australia.

Respirology (Carlton, Vic.)
|December 7, 2019
PubMed
Summary
This summary is machine-generated.

Severe asthma shows distinct gene expression differences in sputum, highlighting the p38 signaling pathway. This pathway

Keywords:
asthmagene expressionimmune systeminflammationsputum

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Area of Science:

  • Respiratory Medicine
  • Genomics
  • Molecular Biology

Background:

  • Severe asthma imposes a significant burden on patients and healthcare systems.
  • Understanding the underlying molecular mechanisms of severe asthma is crucial for developing effective treatments.
  • Sputum transcriptomics offers a valuable tool for investigating airway inflammation in asthma.

Purpose of the Study:

  • To investigate the molecular mechanisms of severe asthma using sputum transcriptomics.
  • To identify novel therapeutic targets for severe asthma.
  • To compare gene expression profiles across different asthma severity levels and healthy controls.

Main Methods:

  • Cross-sectional study involving participants with severe asthma, non-severe uncontrolled asthma, controlled asthma, and healthy controls.
  • Sputum samples were collected for RNA extraction and transcriptomic profiling using Illumina technology.
  • Gene expression data was analyzed, and p38 activation was validated using western blotting in a subset of samples.

Main Results:

  • Significant differential gene expression was observed between the four groups, with thousands of genes altered in severe asthma.
  • A subset of genes showed substantial changes (>2-fold) in severe asthma compared to healthy controls and controlled asthma.
  • Enrichment analysis identified the p38 signaling pathway as significantly associated with severe asthma, with increased p38 phosphorylation correlating with neutrophilic inflammation.

Conclusions:

  • Severe asthma is characterized by unique sputum gene expression patterns reflecting distinct cellular mechanisms.
  • The p38 signaling pathway emerges as a potential key player in the pathogenesis of severe asthma.
  • Targeting the p38 pathway could represent a promising 'non-Th2' therapeutic strategy for severe asthma.