Venous hypertension, inflammation and valve remodeling

Area of Science:

• Vascular Biology
• Inflammation Research
• Pharmacology

Background:

• Chronic venous hypertension (CVH) leads to venous valve destruction.
• Understanding the mechanisms of valve destruction in CVH is crucial for effective treatment.

Purpose of the Study:

• To investigate the mechanisms of venous valve destruction in a rat model of CVH.
• To evaluate the therapeutic potential of a micronized purified flavonoid fraction (MPFF) as an anti-inflammatory treatment.

Main Methods:

• A rat model of CVH was established using a femoral arterial-venous fistula.
• Measurements included femoral venous pressure, valve morphology, venous reflux, and inflammatory markers via immunohistochemistry.
• The effects of MPFF (S 5628) at 50 and 100 mg/kg/day were assessed.

Main Results:

• CVH induced venous reflux, characterized by venous dilation and leaflet shortening, leading to valve incompetence.
• Inflammatory cell infiltration (granulocytes, monocytes, T-lymphocytes) and elevated endothelial P-selectin and ICAM-1 were observed in valve leaflets.
• MPFF treatment dose-dependently inhibited venous reflux and inflammatory markers.
• Apoptosis was prevalent in valve cells, but MMP 2,9 expression was not significantly altered at 3 weeks.

Conclusions:

• Chronic elevated venous pressure triggers an inflammatory cascade in venous valves, contributing to dysfunction and reflux.
• MPFF demonstrates significant anti-inflammatory and protective effects on venous valves in this CVH model.
• MPFF represents a promising therapeutic agent for managing chronic venous hypertension and its associated valve pathology.