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Activated PMNs lead to oxidative stress on chondrocytes: a study of swine knees
Balázs Borsiczky1, Zsolt Szabó, Mohammad T Jaberansari
1Department of Experimental Surgery, University of Pécs, Faculty of Medicine, Pécs HU-7624, Hungary. siczky@expsurg.pote.hu
Abstract:
Using an in vitro model, based on primary cultured chondrocytes, we examined possible oxidative injury caused by activated polymorphonuclear neutrophil granulocytes (PMNs), which are thought to be part of the pathomechanism of hemarthrosis. Chondrocytes were isolated from swine knee joints and divided into three groups. Pure chondrocytes acted as the control population (group I). PMNs from the systemic circulation, and hydrogen peroxide (as an artificial source of reactive oxygen species (ROS)) were added to groups II and III, respectively. All cultures were incubated for 6 hours. After the experiment, lipid membrane degradation by ROS was assessed by monitoring changes in the levels of malondialdehyde (MDA) and 4-hydroxyalkenal contents of the chondrocyte specimens. Changes in the endogenous scavenger status of the chondrocytes were characterized by measuring of reductions in glutathione (GSH) concentration and superoxide dismutase (SOD) activity. Significant increases in MDA/4-hydroxyalkenal levels and SOD activity as well as an expressive reduction in intracellular GSH content were highlighted by comparing the control to the PMN- or H2O2-treated cell populations. These findings confirm previous suggestions that PMN-derived ROS contribute to degradation of cartilage in hemarthrosis.
Insights
Activated neutrophils cause oxidative damage to cartilage cells in hemarthrosis. This study shows polymorphonuclear neutrophils (PMNs) and reactive oxygen species (ROS) increase cartilage degradation markers.
Area of Science:
- Biochemistry
- Cell Biology
- Orthopedics
Background:
- Hemarthrosis, or bleeding into joints, is associated with cartilage damage.
- Activated polymorphonuclear neutrophil granulocytes (PMNs) are implicated in hemarthrosis pathogenesis.
- Oxidative stress is a key factor in cartilage degradation.
Purpose of the Study:
- To investigate the oxidative injury to chondrocytes induced by activated PMNs in an in vitro model.
- To assess the role of reactive oxygen species (ROS) in cartilage degradation during hemarthrosis.
Main Methods:
- Primary chondrocytes from swine knee joints were cultured.
- Chondrocytes were exposed to activated PMNs or hydrogen peroxide (H2O2) for 6 hours.
- Lipid peroxidation was measured via malondialdehyde (MDA) and 4-hydroxyalkenal levels.
- Antioxidant status was assessed by measuring glutathione (GSH) and superoxide dismutase (SOD) activity.
Main Results:
- PMN and H2O2 exposure significantly increased MDA/4-hydroxyalkenal levels, indicating lipid peroxidation.
- Superoxide dismutase (SOD) activity increased in treated groups.
- Intracellular glutathione (GSH) concentration significantly decreased in PMN- and H2O2-treated chondrocytes.
Conclusions:
- PMN-derived ROS contribute to chondrocyte oxidative injury and lipid membrane degradation.
- These findings support the role of oxidative stress in cartilage damage in hemarthrosis.
- The study highlights the potential for therapeutic interventions targeting ROS in hemarthrosis management.
