THROMBOSE-FIBROUS COMPLICATIONS OF SYSTEMIC ENDOTHELIUM DAMAGE AT COVID-19

The analysis of literature data and our own research of lungs tissues of the persons who died owing to COVID-19 caused fibrosis testify to participation in this pathology of a cascade of disturbances of molecular and cellular levels. Viral damage to endothelial cells causes systemic damage to the vascular glycocalyx, which loses its clotting properties and releases significant amounts of blood clotting factors. The fibrin clot formed under such conditions is characterized by resistance to fibrinolysis and locally blocks blood vessels with the systemic development of endogenous intoxication. Destabilized proteins of the latter form micro- and nano-sized aggregates with a significant content of β-folded structures. This contributes to the increase of fibrin resistance to the proteolytic action of plasmin, causes the development of fibrosis of the tissues affected in this way, and leads to the failure of the functions of the relevant organs.