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Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

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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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Related Experiment Video

Updated: May 12, 2026

Immunofluorescent Labeling in Nasal Mucosa Tissue Sections of Allergic Rhinitis Rats via Multicolor Immunoassay

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A proposed model to study immunologic changes during chronic rhinosinusitis exacerbations: data from a pilot study.

Matthew A Rank¹, John B Hagan, Shefali A Samant

¹Division of Allergy, Asthma, and Immunology, Mayo Clinic, Scottsdale, Arizona, USA. rank.matthew@mayo.edu

American Journal of Rhinology & Allergy

|April 9, 2013

Summary

Studying immune responses during chronic rhinosinusitis (CRS) exacerbations reveals key inflammatory markers. Elevated interleukin-6 (IL-6), eosinophil major basic protein (MBP), and myeloperoxidase (MPO) indicate significant immune system activation during symptom flares.

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Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber

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Area of Science:

Immunology
Otorhinolaryngology
Pathophysiology

Background:

Chronic rhinosinusitis (CRS) pathophysiology can be elucidated by examining immune system alterations during exacerbations.
Understanding these changes is crucial for developing targeted therapies.

Purpose of the Study:

To investigate the immunologic changes occurring during acute exacerbations of chronic rhinosinusitis with nasal polyposis.
To identify specific biomarkers indicative of CRS flare-ups.

Main Methods:

A prospective study involving adult subjects diagnosed with CRS and nasal polyposis.
Collection of nasal secretions and washes at baseline and during acute symptom worsening for biomarker analysis.
Measurement of key inflammatory markers including IL-6, IL-33, eosinophil major basic protein (MBP), eosinophil-derived neurotoxin (EDN), myeloperoxidase (MPO), and uric acid.

Main Results:

Nine out of ten recruited subjects experienced CRS exacerbations.
Significant elevations in IL-6, MBP, MPO, EDN, and uric acid were observed during exacerbations compared to baseline.
Strong positive correlations were found between IL-6 and MBP, and IL-6 and MPO levels.

Conclusions:

Prospective studies of CRS exacerbations are feasible and valuable for understanding disease mechanisms.
Specific immune markers significantly increase during CRS flare-ups, offering potential diagnostic or therapeutic targets.