The influences of divalent metal ions on fibrin monomer polymerization.

This work was undertaken in an attempt to clarify the influences of divalent metal ions on the polymerization of fibrin monomer. Polymerization was strongly inhibited by such Ca-binding chelating agents as 1,2-cyclohexanediaminetetraacetic acid, ethylenediaminetetraacetic acid and glycoletherdiaminetetraacetic acid, and a close relationship was seen between their inhibitory capacity and their stability against Ca2+. The polymerization inhibited by ethylenediaminetetraacetic acid could not be reversed by the addition of Mg2+, Sr2+ or Ba2+, whose stability constants are smaller than that of Ca2+, but it could be completely reversed, and even directly accelerated by Zn2+, Cu2+, Cd2+ or Co2+ whose stability constants are greater than that of Ca2+.