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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: Introduction01:28

Asthma I: Introduction

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Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...
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Asthma: Pathogenesis and Management01:20

Asthma: Pathogenesis and Management

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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.
Asthma is classified as allergic and non-allergic. Allergens such as dust mites, pollen, and pet dander trigger allergic asthma, while factors like cold air, intense emotions, or exercise can induce non-allergic asthma.
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Antiasthma Drugs: Mast Cell Stabilizers and Anti-IgE Drugs01:25

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Asthma is a chronic respiratory condition for which new therapeutic avenues, including anti-inflammatory drugs like mast cell stabilizers and anti-IgE treatments, continue to be developed.
Mast cell stabilizers, such as cromolyn (also known as sodium cromoglycate) and nedocromil (Tilade), are effective drugs in asthma management. These stabilizers hinder histamine release by skillfully obstructing the activation of mast cells and other cellular entities. Notably, they navigate this task without...
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Asthma-I: Introduction01:29

Asthma-I: Introduction

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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 III: Clinical Manifestations01:13

Asthma III: Clinical Manifestations

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Asthma presents with a characteristic pattern of episodic respiratory symptoms that reflect underlying airway inflammation, bronchoconstriction, and mucus hypersecretion. Although severity varies among individuals, certain clinical manifestations are considered hallmarks of the disorder and often guide diagnosis and assessment.Respiratory SymptomsA persistent cough is one of the most common early features of asthma. It is frequently dry and tends to worsen at night or in the early morning,...
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Related Experiment Video

Updated: May 5, 2026

Advanced Imaging of Lung Homing Human Lymphocytes in an Experimental In Vivo Model of Allergic Inflammation Based on Light-sheet Microscopy
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Mast cells, their subtypes, and relation to asthma phenotypes.

Merritt L Fajt1, Sally E Wenzel

  • 11 Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Pittsburgh Asthma Institute at UPMC/University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.

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Mast cells (MCs) are key players in asthma and allergies. Specific MC subtypes in the airway epithelium may contribute to severe, Th2-driven asthma.

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Area of Science:

  • Immunology
  • Pulmonology
  • Cell Biology

Background:

  • Mast cells (MCs) are implicated in allergic responses and asthma.
  • MCs are found in human airway submucosa, smooth muscle, and epithelium.
  • Understanding MC distribution and subtypes in relation to asthma phenotypes is crucial.

Purpose of the Study:

  • To explore the role of mast cell subtypes in the pathophysiology of asthma.
  • To investigate the presence and specific subtypes of mast cells within the human airway epithelium in asthma.

Main Methods:

  • Analysis of mast cell distribution and location in human airways.
  • Characterization of mast cell subtypes based on protease granule content (e.g., tryptase, chymase).

Main Results:

  • Mast cells are present in various locations within the human airway.
  • Emerging evidence suggests altered mast cell subtypes in the airway epithelium.
  • These specific epithelial mast cells may be involved in severe, Th2-associated asthma.

Conclusions:

  • Mast cells, particularly specific subtypes in the airway epithelium, are relevant to asthma.
  • Further research is needed to fully elucidate the role of mast cell heterogeneity in asthma pathophysiology and phenotypes.