Morphological determinants for the local hemostatic effect of exogenous fibrin monomer in its systemic administration after injury with inhibition of platelet aggregation in the experiment

Background. In our previously published studies, we demonstrated a high hemostatic activity of a low dose of exogenous fibrin monomer during its systemic administration in a model of dosed liver injury with preliminary inhibition of platelet aggregation. However, the analysis of platelet involvement in the mechanisms of local fibrin formation has not been analyzed. The aim of the study. To conduct a comparative analysis of the cellular composition of venous and wound blood, as well as blood in the wound vessels to assess the contribution of platelets to the hemostatic effect of exogenously administered fibrin monomers in dosed liver injury under conditions of pharmacologically determined thrombocytopathy. Methods. In a model of dosed liver injury in rabbits after inhibition of platelet aggregation by  acetylsalicylic acid in combination with clopidogrel, the effect of the administration of fibrin monomer was evaluated in comparison with the use of tranexamic acid. We studied the number of platelets in venous and wound blood smears, as well as in the contents of wound vessels. Results. It has been established that with the systemic administration of exogenous fibrin monomer, the number of platelets in wound blood smears decreases by 17.2 % in comparison with free circulating venous blood. Platelets in wound blood form aggregates and are in an activated state. In the wound vessels, the number of these cells was maximum (150 per lower field) compared with the number of platelets in the placebo and tranexamic acid groups (55 and 84 per lower field, respectively). Also in the wound blood, erythrocytes with altered forms (echinocytes, schistocytes, stomatocytes and ovalocytes) were found. Conclusion. Systemic administration of exogenous fibrin monomer affects the redistribution of platelets between the systemic circulation, wound vessels and wound blood, determining its hemostatic effect and local wound fibrin formation in dosed liver injury. The presence of receptor-mediated platelets recruitment due to fibrin monomer in the wound vessels with the  participation of damaged erythrocytes is assumed

КЛИНИЧЕСКИЕ АСПЕКТЫ ОПУХОЛЕВОГО АНГИОГЕНЕЗА В ПЕРИТУМОРОЗНОЙ ЗОНЕ У БОЛЬНЫХ РАКОМ ПОЧКИ

The specific features of tumor angiogenesis were studied in cancer-adjacent kidney tissues. The activity of neoangionesis in the peritumor area (PA) was shown to depend on the biological properties of a tumor and to be highest in high-grade tumors. The density of the PA microcirculatory bed correlated with the most important prognostic parameters for renal cell carcinoma and therefore it might be used as an additional prognostic factor in kidney cancer.Изучены особенности опухолевого ангиогенеза в тканях, прилежащих к раку почки. Показано, что активность неоангиогенеза в перитуморозной зоне (ПЗ) зависела от биологических свойств опухоли и была наиболее высока в опухолях высокой степени злокачественности. Плотность микроциркуляторного русла в ПЗ коррелировала с важнейшими прогностическими параметрами карциномы почки и поэтому может быть использована в качестве дополнительного фактора прогноза при раке почки

TUMOR ANGIOGENESIS IN THE PERITUMOR AREA IN KIDNEY CANCER PATIENTS: CLINICAL ASPECTS

The specific features of tumor angiogenesis were studied in cancer-adjacent kidney tissues. The activity of neoangionesis in the peritumor area (PA) was shown to depend on the biological properties of a tumor and to be highest in high-grade tumors. The density of the PA microcirculatory bed correlated with the most important prognostic parameters for renal cell carcinoma and therefore it might be used as an additional prognostic factor in kidney cancer