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Asthma-II: Pathophysiology and Classification

Asthma-II: Pathophysiology and Classification

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:

Asthma I: Introduction

Asthma I: Introduction

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...

Asthma: Pathogenesis and Management

Asthma: Pathogenesis and Management

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.

Asthma-I: Introduction

Asthma-I: Introduction

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...

Antiasthma Drugs: Leukotriene Modifiers

Antiasthma Drugs: Leukotriene Modifiers

Leukotriene modifiers, or cysteinyl leukotriene receptor antagonists, are medications used to manage chronic asthma. These agents target specific inflammatory mediators produced during arachidonic acid metabolism, an essential process in generating inflammation in the body.
Leukotriene modifiers work through two distinct mechanisms:

Antiasthma Drugs: Mast Cell Stabilizers and Anti-IgE Drugs

Antiasthma Drugs: Mast Cell Stabilizers and Anti-IgE Drugs

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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Related Experiment Video

Updated: Jun 7, 2026

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

Published on: May 16, 2016

Modulation of asthma by endotoxin.

V Doreswamy¹, D B Peden

¹Department of Pediatrics, Division of Allergy, Immunology, Rheumatology and Infectious Diseases Center for Environmental Medicine, Asthma and Lung Biology, School of Medicine, University of North Carolina, Chapel Hill, NC, USA.

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology

|October 28, 2010

Summary

This summary is machine-generated.

Environmental endotoxin exposure influences asthma development and severity. Gene-environment interactions, particularly concerning pets, significantly impact outcomes in this common inflammatory disease.

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Murine Model of Allergen Induced Asthma

Murine Model of Allergen Induced Asthma

Published on: May 14, 2012

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Last Updated: Jun 7, 2026

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

Published on: May 16, 2016

Murine Model of Allergen Induced Asthma

Murine Model of Allergen Induced Asthma

Published on: May 14, 2012

Area of Science:

Immunology
Environmental Health
Genetics

Background:

Asthma is a prevalent inflammatory condition influenced by allergic and non-allergic factors.
A key risk factor for asthma is immunoglobulin E (IgE) induction and a T-helper type 2 (Th2) skewed immune response.
Both genetic predisposition and environmental exposures contribute to asthma development and progression.

Purpose of the Study:

To review studies since 2001 investigating the role of endotoxin in asthma.
To explore the complex gene-environment interactions influencing endotoxin's effects on asthma.

Main Methods:

Literature review focusing on studies published from 2001 onwards.
Analysis of research examining endotoxin exposure, asthma development, and exacerbation.
Investigation of genetic factors interacting with environmental endotoxin exposure.

Main Results:

Endotoxin, an environmental pollutant, typically elicits a T-helper type 1 (Th1) immune response.
Exposure to endotoxin can paradoxically protect against asthma development or worsen existing inflammation.
The impact of endotoxin is modulated by timing, dose, and crucial gene-environment interactions, including pet exposure.

Conclusions:

Gene-environment interactions are critical in determining the effect of endotoxin on asthma.
Understanding these interactions is key to explaining variable outcomes in asthma research.
Further research into endotoxin's dual role and genetic influences is warranted for asthma management.