Cause-effect relation between hyperfibrinogenemia and vascular disease.

Area of Science:

• Cardiovascular Science
• Hematology
• Molecular Biology

Background:

• Elevated plasma fibrinogen is linked to cardiovascular disease (CVD).
• It remains debated whether high fibrinogen causally increases CVD risk or is merely an associated marker.
• Understanding fibrinogen's role is crucial for CVD risk assessment and treatment.

Purpose of the Study:

• To investigate the causal role of elevated plasma fibrinogen in cardiovascular disease pathogenesis.
• To determine if hyperfibrinogenemia independently modulates vascular remodeling and fibrin deposition.
• To explore the complex interactions of fibrinogen with other hemostatic factors in disease progression.

Main Methods:

• Utilized a transgenic mouse model engineered for hyperfibrinogenemia.
• Analyzed fibrin deposition in specific organs under elevated fibrinogen conditions.
• Assessed the impact of hyperfibrinogenemia on stasis-induced vascular remodeling (neointimal hyperplasia).
• Investigated fibrinogen's effect on thrombin generation in response to procoagulant stimuli.

Main Results:

• Hyperfibrinogenemia led to increased fibrin deposition in organs.
• Fibrinogen interacted with other hemostatic factors, influencing fibrin turnover.
• Elevated fibrinogen exacerbated neointimal hyperplasia in a vascular remodeling model.
• Paradoxically, hyperfibrinogenemia appeared to suppress thrombin generation under certain conditions.

Conclusions:

• Hyperfibrinogenemia is not just a marker but a direct contributor to cardiovascular disease.
• Elevated fibrinogen can independently or interactively modulate the severity and progression of vascular disease.
• These findings support targeting fibrinogen levels for managing cardiovascular risk.