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The control of vascular endothelial cell injury
1Section of Physiological Chemistry, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.
Abstract:
The mechanism by which MCI-186 showed a potent cytoprotective effect on the in vitro endothelial cell injury due to 15-HPETE was studied. Stimulation of human leukocytes with various chemical mediators such as TPA, f-Met-Leu-Phe, LTB4, etc. elicited the production of active oxygens, which could be detected by luminol-dependent chemiluminescence. Among the chemical mediators tested, TPA elicited the chemiluminescence the most, and f-Met-Leu-Phe and LTB4 came next. When the leukocytes were directly placed on a monolayer of cultured endothelial cells, followed by stimulating the leukocytes with TPA, severe endothelial cell injury was observed. The effect of TPA was dose dependent. There was good correlation between the active oxygen releasing activity and the cytotoxic activity. When the leukocytes were placed on a filter which was set apart from the monolayer of endothelial cell in a culture dish, and stimulated the leukocytes with TPA, no cytotoxicity was observed. These data strongly suggest that the substance responsible for the cytotoxicity must be a very labile and short-lived substance, presumably active oxygens. On the other hand, MCI-186 was found to have a complete quenching activity to the chemiluminescence due to active oxygens in the TPA-leukocyte system. Taken together, these factors indicate that the potent cytoprotective effect of MCI-186 may be due to its specific radical scavenging activity.
Insights
MCI-186 protects endothelial cells from injury by scavenging active oxygen species. This study demonstrates MCI-186
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Endothelial cell injury is a significant concern in various physiological and pathological conditions.
- Active oxygen species generated by leukocytes contribute to endothelial cell damage.
- MCI-186 is a potential therapeutic agent with known antioxidant properties.
Purpose of the Study:
- To investigate the mechanism of MCI-186's cytoprotective effect against 15-HPETE-induced endothelial cell injury.
- To identify the role of active oxygen species in leukocyte-mediated endothelial cell damage.
- To elucidate the interaction between MCI-186 and active oxygen species.
Main Methods:
- Human leukocytes were stimulated with various mediators (TPA, f-Met-Leu-Phe, LTB4) to induce active oxygen production, detected by chemiluminescence.
- Endothelial cell injury was assessed when leukocytes were directly co-cultured and stimulated.
- The effect of MCI-186 on active oxygen production and endothelial cell viability was evaluated.
Main Results:
- TPA stimulation of leukocytes induced significant active oxygen production and dose-dependent endothelial cell injury.
- A strong correlation was observed between active oxygen release and cytotoxic activity.
- MCI-186 effectively quenched active oxygen-induced chemiluminescence in the TPA-leukocyte system.
Conclusions:
- Active oxygen species are likely responsible for the observed endothelial cell injury.
- MCI-186 exhibits potent cytoprotective effects by scavenging these reactive oxygen species.
- The radical scavenging activity of MCI-186 underlies its protective mechanism against endothelial cell damage.