Related Experiment Videos
Erythema multiforme: a possible pathogenetic role of increased reactive oxygen species
Abstract:
Recently, it has been suggested that reactive oxygen species (ROS) produced by activated polymorphonuclear leukocytes (PMNs) exert auto-oxidative tissue damage at the site of inflammation. In the present study, a possible role of ROS in the pathogenesis of erythema multiforme (EM) was investigated by determining the capacity of the sera from patients for generating ROS from PMNs. Significantly increased hydroxyl radical production was observed, which is one of the most potent ROS capable of causing tissue damage. This change was not observed when PMNs were incubated with sera from patients with bullous pemphigoid (BP) or inflammatory acne, indicating that this finding was not a common feature of immunologically mediated and/or inflammatory cutaneous disorders. Elevated C1q activities and depositions of immunoreactants in the blood vessels were also noticed in some patients. These findings suggest that ROS generated by PMNs are involved in the formation of cutaneous lesions of EM and that immune complexes (ICs) may provide an important mechanism in PMN activation.
Insights
Reactive oxygen species (ROS) from polymorphonuclear leukocytes (PMNs) may cause tissue damage in erythema multiforme (EM). Studies show increased hydroxyl radical production in EM patients, suggesting ROS involvement in lesion formation.
Area of Science:
- Immunodermatology
- Oxidative Stress Research
Background:
- Reactive oxygen species (ROS) from activated polymorphonuclear leukocytes (PMNs) are implicated in inflammatory tissue damage.
- The specific role of ROS in erythema multiforme (EM) pathogenesis requires further investigation.
Purpose of the Study:
- To investigate the role of ROS in erythema multiforme (EM) pathogenesis.
- To determine the capacity of sera from EM patients to generate ROS from PMNs.
Main Methods:
- Assessing ROS generation by incubating PMNs with sera from EM patients.
- Comparing ROS production in EM patients versus those with bullous pemphigoid (BP) and inflammatory acne.
- Measuring C1q activities and detecting immunoreactant depositions.
Main Results:
- Significantly increased hydroxyl radical production was observed in EM patient sera.
- This elevated ROS production was specific to EM, not seen in BP or acne patients.
- Elevated C1q activities and vascular immunoreactant depositions were noted in some EM patients.
Conclusions:
- ROS generated by PMNs contribute to the pathogenesis of cutaneous lesions in EM.
- Immune complexes (ICs) may play a crucial role in activating PMNs in EM.
- These findings highlight a potential mechanism involving oxidative stress and immune complex formation in EM development.