[Regulation of endothelial cells functions by ultrasonic supernatant of Streptococcus pyogenes]

Angiogenesis and vascular remodeling are vital components of inflammation. As an inflammation evolves, vessels expand to supply nutrients and inflammatory mediators, sustaining the accumulation of activated immune cells in the affected tissues. This study demonstrates that ultrasonic supernatant of Streptoccocus pyogenes has anti-angiogenic properties: inhibit EA.hy 926 human endothelial cells metabolism, adhesion, migration, proliferation. At the same time Streptococcal components inhibit signaling pathways that involve FAK and ERK1/2. These effects are not associated with necrosis or apoptosis in cell culture. Taking together, our results suggest that impairing angiogenic function of endothelial cells might contribute to the reduced tissue perfusion, hypoxia, and subsequent regional tissue necrosis caused by Streptococci group A.