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Differential effects of divalent cations on fibrin structure
1Division of Hematology/Oncology, Medical College of Virginia, Richmond.
Summary
Magnesium and zinc significantly influence fibrin assembly and structure, similar to calcium. Magnesium alters fibrin clot formation and fibre characteristics, while zinc shows potent effects at low concentrations in purified systems.
Area of Science:
- Biochemistry
- Hematology
- Biophysics
Background:
- Calcium (Ca2+) is a known cofactor in hemostasis, influencing fibrin structure.
- The effects of other divalent cations like magnesium (Mg2+) and zinc (Zn2+) on fibrin assembly are less understood.
Purpose of the Study:
- To investigate the influence of magnesium and zinc on fibrin assembly and structure.
- To compare the effects of magnesium and zinc with those of calcium.
Main Methods:
- Evaluated fibrin assembly and structure using purified fibrin-thrombin systems and plasma.
- Measured turbidity, lag phase, and fibre mass/length ratios.
- Utilized batroxobin to initiate clotting, bypassing fibrinopeptide B release.
Main Results:
- Magnesium (20 mM) shortened the lag phase and increased fibrin fibre mass/length ratios in purified and plasma systems.
- Zinc exhibited effects at low concentrations (µM range), shortening the lag phase and increasing fibre mass/length ratios.
- Zinc showed no significant impact on fibrin structure in citrated or non-anticoagulated plasma at concentrations up to 100 µM.
Conclusions:
- Magnesium and zinc can modulate fibrin assembly and structure, mimicking some effects of calcium.
- Zinc's potent effects in purified systems do not translate to plasma, suggesting plasma components may interfere.
- Further research is needed to elucidate the in vivo relevance of these findings.