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Platelet activation by mercuric compounds
B Kostka1, U Krajewska, P Rieske
1Department of Biochemistry, Institute of Environmetal Research and Bioanalysis, Medical University of Łódź, Muszyńskiego 1, 90-151 Łódź, Poland.
Platelets
|June 24, 2006
Summary
Mercury compounds like methylmercuric chloride activate platelets independently of common receptors. Pig platelets absorb significantly more mercury than plasma proteins, potentially explaining links to vascular events.
Area of Science:
- Toxicology
- Hematology
- Biochemistry
Background:
- Mercury (Hg) compounds, particularly methylmercuric chloride (MMC), at low concentrations (0.01-10 micromol/l) may synergize with agonists to activate platelets.
- Previous research indicated potential alterations in blood coagulation due to mercury exposure in animal models.
Purpose of the Study:
- To investigate the mechanism of methylmercuric chloride (MMC)-induced platelet activation in pigs.
- To determine if MMC-induced platelet activation relies on fibrinogen and ADP membrane receptors.
- To quantify mercury uptake by platelets compared to plasma proteins.
Main Methods:
- Incubation of platelet-rich plasma with methylmercuric chloride (MMC).
- Assessment of platelet activation pathways, specifically receptor dependency.
- Quantification of mercury (Hg) levels in platelets and plasma proteins.
Main Results:
- Platelet activation by methylmercuric chloride (MMC) in pigs is independent of membrane receptors for fibrinogen and ADP.
- Pig platelets exhibit a significantly higher uptake of mercury (approximately 13-fold) compared to plasma proteins when incubated with MMC.
- These findings suggest a direct interaction between mercury and platelets.
Conclusions:
- Methylmercuric chloride activates pig platelets through a mechanism not involving fibrinogen or ADP receptors.
- The high mercury uptake by platelets provides a potential explanation for the observed association between mercury poisoning and vascular events.
- Further research into mercury's direct effects on hemostasis is warranted.