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The effect of zinc ions (Zn2+) on the procoagulant activity of PMN leukocytes
Abstract:
The effects of Zn2+, Mg2+ and Mn2+ in vitro were studied on the procoagulant activity of peritoneal PMN leukocytes derived from endotoxin treated rabbits. The cells collected from the abdominal cavity were incubated in the presence of these divalent cations at 37 degrees in Hank's solution followed by determination of the clotting activity of their supernatants in citrate treated rabbit plasma. When the cells were incubated in the presence of 50 microM/l ZnCl2 the procoagulant activity of their supernatants decreased by 30%. Upon the application of 100 microM/l ZnCl2 a 50-60% increase in clotting time was observed. Zinc ions inhibited in a concentration dependent manner the release of procoagulant material from leukocytes. Neither of the other cations used as controls has influenced clotting time if assayed in a similar system. It has been established that zinc ions inhibited the liberation of tissue factor from endotoxin treated PMN leukocytes. The inhibitory effect was dose dependent and increased from 5 microM/l to 250 microM/l exponentially. The inhibitory effect of zinc ions on tissue factor liberation might be explained by membrane stabilization.
Insights
Zinc ions significantly inhibit the release of procoagulant factors from leukocytes, potentially by stabilizing cell membranes. This finding offers new insights into managing endotoxin-induced inflammation and blood clotting.
Area of Science:
- Biochemistry
- Immunology
- Hematology
Background:
- Endotoxin exposure can activate polymorphonuclear leukocytes (PMN), leading to increased procoagulant activity.
- This activation contributes to the risk of disseminated intravascular coagulation (DIC) and other thrombotic complications.
Purpose of the Study:
- To investigate the in vitro effects of divalent cations (Zn2+, Mg2+, Mn2+) on the procoagulant activity of peritoneal PMN leukocytes.
- To determine if zinc ions can modulate the release of tissue factor from endotoxin-activated PMN leukocytes.
Main Methods:
- Peritoneal PMN leukocytes were isolated from endotoxin-treated rabbits.
- Cells were incubated with varying concentrations of Zn2+, Mg2+, or Mn2+ in Hank's solution.
- Procoagulant activity of cell supernatants was measured using clotting assays in citrated rabbit plasma.
Main Results:
- Zinc ions (Zn2+) inhibited procoagulant activity in a dose-dependent manner, with significant inhibition observed at 50 and 100 microM/l ZnCl2.
- Neither Mg2+ nor Mn2+ showed a similar inhibitory effect.
- Zinc ions demonstrated an exponential dose-dependent inhibition of tissue factor release from PMN leukocytes.
Conclusions:
- Zinc ions possess a potent inhibitory effect on the procoagulant activity of endotoxin-activated PMN leukocytes.
- This inhibition is likely mediated by reduced tissue factor liberation, possibly due to membrane stabilization effects of zinc.
- These findings suggest a potential therapeutic role for zinc in mitigating endotoxin-induced procoagulant responses.