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Two novel thrombin-independent pathways create fibrinogen (FBG) gels and FBG-fibronectin (FN) complexes. Factor XIII (FXIII) drives FBG polymerization, while Factor XII (FXII) catalyzes FBG-FN heteropolymer formation, suggesting a significant in vivo fibrinogen pathway.

Area of Science:

Biochemistry
Molecular Biology
Hemostasis

Background:

Fibrinogen (FBG) and fibronectin (FN) are key plasma proteins involved in hemostasis.
Thrombin-mediated fibrin formation is the primary pathway in blood clotting.
The role of other factors and alternative pathways in FBG and FBG-FN complex formation is less understood.

Purpose of the Study:

To investigate thrombin-independent reactions of fibrinogen (FBG) and fibronectin (FN).
To elucidate the mechanisms of FBG polymerization and gelation.
To characterize the formation of FBG-FN heteropolymers and their structures.

Main Methods:

Enzymatic assays using purified FBG, FN, Factor XIII (FXIII), and Factor XII (FXII).
Analysis of protein oligomerization and gelation using techniques like SDS-PAGE.

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Investigation of the role of calcium ions and thiol compounds (e.g., DTT) in the reactions.

Main Results:

FXIII with calcium ions induces FBG oligomerization and gelation (fibrinogenin) via gamma-chain and A alpha-chain crosslinking.
FXII catalyzes the formation of FBG-FN heteropolymers (heteronectin), with A alpha-chain of FBG linking to FN.
Thiol compounds enhance both FBG and FBG-FN reactions; reaction outcome depends on initial FBG:FN concentrations.

Conclusions:

Identified two novel thrombin-independent pathways for FBG polymerization and FBG-FN heteropolymer formation.
FXIII and FXII play critical roles in these alternative pathways.
Findings suggest the importance of the fibrinogen pathway in vivo, beyond thrombin-mediated clotting.