Related Experiment Video

Updated: Aug 19, 2026

Generation of a Chronic Obstructive Pulmonary Disease Model in Mice by Repeated Ozone Exposure
08:17

Generation of a Chronic Obstructive Pulmonary Disease Model in Mice by Repeated Ozone Exposure

Published on: August 25, 2017

Decreased bactericidal function and impaired respiratory burst in lung macrophages after sustained in vitro hyperoxia

N Suttorp, L M Simon

    The American Review of Respiratory Disease
    |September 1, 1983
    PubMed

    Insights

    High oxygen levels impair lung macrophages' ability to kill bacteria. This study shows sustained hyperoxia decreases bacterial defense and reduces the generation of key bactericidal molecules, suggesting impaired respiratory burst function.

    Area of Science:

    • Immunology
    • Cell Biology
    • Respiratory Medicine

    Background:

    • Lung macrophages (LM) are vital for combating bacterial infections in the lungs.
    • Therapeutic use of high oxygen concentrations can lead to "oxygen toxicity," potentially compromising LM antibacterial functions.

    Purpose of the Study:

    • To investigate the impact of sustained in vitro hyperoxia on the bactericidal capacity of lung macrophages.
    • To assess the effect of hyperoxia on the generation of bactericidal oxygen metabolites, specifically superoxide anion (O2-) and hydrogen peroxide (H2O2).

    Main Methods:

    • Lung macrophages were cultured under aerobic (approx. 140 mmHg PO2) or hyperoxic (approx. 630 mmHg PO2) conditions for 48 hours.
    • Cultured LM were incubated with Staphylococcus aureus to measure bacterial uptake and intracellular viability.
    • Superoxide anion and hydrogen peroxide generation were quantified in response to zymosan stimulation.

    Main Results:

    • Sustained hyperoxia significantly decreased the bacterial killing capacity of lung macrophages (p < 0.001).
    • Exposure to high oxygen tensions led to a significant reduction in the generation of superoxide anion and hydrogen peroxide (p < 0.001).

    Conclusions:

    • Sustained hyperoxia impairs the bactericidal function of lung macrophages.
    • The observed decrease in bacterial killing is likely due to an impaired "respiratory burst" mechanism, affecting the production of key oxygen metabolites.

    More Related Videos

    In Vivo Assessment of Alveolar Macrophage Efferocytosis Following Ozone Exposure08:54

    In Vivo Assessment of Alveolar Macrophage Efferocytosis Following Ozone Exposure

    Published on: October 22, 2019

    Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury14:48

    Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury

    Published on: March 21, 2021

    Related Concept Videos

    Respiratory Assessment: Purpose and Indications01:19

    Respiratory Assessment: Purpose and Indications

    Respiratory assessment is a cornerstone of nursing assessments, crucial for the early detection of patient deterioration. This evaluation transcends routine procedures, representing a critical skill nurses must master to ensure optimal patient care.
    Objectives and Importance:
    The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...
    Oxygen Transport in the Blood01:27

    Oxygen Transport in the Blood

    Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
    Acute Respiratory Failure-I01:21

    Acute Respiratory Failure-I

    Acute respiratory failure is a condition characterized by the inability of the lungs to perform their primary function: gas exchange. This failure leads to insufficient oxygen levels (hypoxemia) in the blood, elevated carbon dioxide levels (hypercapnia), or both, causing critical impairment in organ function.
    Definition: It is defined by specific criteria based on blood gas measurements. Hypoxemia happens when the partial pressure of oxygen (PaO2) falls below 60 mmHg. At the same time,...
    Acute Respiratory Failure-II01:21

    Acute Respiratory Failure-II

    Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
    The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
    Oxygen Requirements and Growth Patterns01:29

    Oxygen Requirements and Growth Patterns

    Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
    Chronic Obstructive Pulmonary Disease II: Emphysema01:23

    Chronic Obstructive Pulmonary Disease II: Emphysema

    Emphysema, a major phenotype of chronic obstructive pulmonary disease (COPD), is characterized by irreversible destruction of alveolar walls and permanent enlargement of distal airspaces. Unlike chronic bronchitis, which primarily affects the airways, emphysema predominantly involves the lung parenchyma, where structural damage leads to airflow limitation.PathophysiologyIt most commonly results from prolonged exposure to cigarette smoke and other toxic gases, particularly cigarette smoke.