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Related Concept Videos

Hypersensitivities01:30

Hypersensitivities

Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
Pneumonia I: Introduction01:29

Pneumonia I: Introduction

Pneumonia is an infection of the lower respiratory tract that leads to inflammation of the lung parenchyma, often resulting in the accumulation of inflammatory exudate in the alveoli and airways. Unlike the watery, low-protein fluid exudate in pulmonary edema, the exudate in this case is a thick fluid rich in immune cells, proteins, and debris produced during infection and inflammation.This impairs gas exchange and can lead to consolidation of lung tissue. The infection may be caused by a...
Pneumonia I: Introduction01:30

Pneumonia I: Introduction

Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

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...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...

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Related Experiment Video

Updated: May 20, 2026

Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices
12:04

Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices

Published on: May 9, 2018

Recent advances in hypersensitivity pneumonitis.

Yves Lacasse1, Mélissa Girard1, Yvon Cormier1

  • 1Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec (Hôpital Laval), Québec, QC, Canada.

Chest
|July 17, 2012
PubMed
Summary

Hypersensitivity pneumonitis (HP) is a lung disease caused by allergen inhalation. Diagnosis involves clinical signs, imaging, and lab tests, with evolving classification and new antigen discoveries prompting research.

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Area of Science:

  • Pulmonology
  • Immunology
  • Environmental Medicine

Background:

  • Hypersensitivity pneumonitis (HP) is a lung disease triggered by inhaled allergens.
  • Diagnosis often relies on nonspecific clinical findings, imaging, and serological/histological evidence.
  • Traditional HP classification is being re-evaluated with proposed clinical predictors.

Purpose of the Study:

  • To review the diagnostic challenges and evolving understanding of hypersensitivity pneumonitis.
  • To highlight new identified antigens and their implications for HP research.
  • To discuss the potential for acute exacerbations in chronic HP.

Main Methods:

  • Review of clinical symptoms and diagnostic criteria for HP.
  • Analysis of histopathological findings, including interstitial pneumonitis and organizing pneumonia.
  • Identification of novel antigens implicated in HP, such as mycobacteria and metalworking fluids.

Main Results:

  • HP diagnosis integrates clinical, radiological, immunological, and pathological data.
  • Histological patterns can be varied, including nonspecific interstitial pneumonitis.
  • Emerging antigens like mycobacteria (hot tub lung) and metalworking fluids are recognized.

Conclusions:

  • HP diagnosis requires a comprehensive approach, integrating multiple data types.
  • The classification and understanding of HP are evolving, with new insights into its pathogenesis.
  • Ongoing research into novel antigens is crucial for advancing HP diagnosis and management.