Simulation of peritoneal sepsis and its treatment with serum in an experiment: peculiarities of morphological disorders of liver, spleen and kidney tissues

Abstract

Sepsis develops as a normal inflammatory response to various infections. It proceeds with the picture of a complex heterogeneous syndrome, which often leads to the development of multiple organ failure. The number of affected organs correlates with mortality. Organ failure is characterized by a sequence – initially pulmonary, then renal, cardiovascular, and in the terminal stage, there is a failure of the central nervous system function. The aim of the study was to model peritoneal sepsis in an experiment, develop a therapeutic serum as an analog of anti-reticular cytotoxic serum by O. O. Bogomolets (ACS), and investigate the therapeutic properties and specific morphological changes in the liver, spleen, and kidneys of septic and treated animals. To simulate peritoneal sepsis, laboratory mice were injected intraperitoneally with a solution of 10 % of filtered fecal suspension of guinea pig (from 0.05 to 3.0 ml), the level of the toxic dose at which all mice died was determined (0.35 ml of fecal suspension) after that lethal bloodletting was administered under thiopental anesthesia. Their spleens were removed, from which therapeutic serum was made. Guinea pigs of the experimental group were injected with a suspension of the spleen of mice with an increasing dose from 0.02 to 0.2 ml after the simulation of fecal peritonitis. The optimal therapeutic dose at which the ants continued to live for 14 days was determined: 0.08 ml. Under thiopental anesthesia (50 mg/kg), their liver, kidneys, and spleen were taken for histological studies. The processing of the obtained histological specimens was carried out according to generally accepted methods. Histological preparations were studied using an SEO SСAN light microscope. It was found that under conditions of peritoneal sepsis in the liver, the lobular organization of hepatocytes was dramatically disturbed. The central veins and vessels of the portal tracts were moderately dilated and filled with blood, but the lumens of the sinusoids were practically not visualized. The sizes of hepatocytes increased sharply, contours were erased, and intercellular connections were disrupted. Histological examination of the kidney revealed a drastic decrease in the blood volume in the vessels of the arterial bed, which is visualized by the structural manifestations in the cortical layer. Collaptoid shrinkage of glomerular vessels was observed, which manifested in their sharp reduction in size. A significant part of the endotheliocytes was damaged. Examination of the spleen revealed a significant increase in the area of the red pulp due to the pronounced expansion of the sinusoids and an increase in their blood supply. The white pulp exhibited small, moderately diffuse foci of lymphocyte clusters. Follicle structures were practically not visualized. Histological examination of the liver in animals with simulated peritoneal sepsis on the background of correction with an extract from the spleen of mice revealed a moderate expansion and full blood vessels of the portal tracts and central veins. The contours of the vast majority of hepatocytes grew clear, intercellular contacts were restored. Histological examination of the kidney revealed a moderate increase in the blood volume in the vessels of the arterial bed, mainly in the cortical layer. A mild expansion and fullness of blood vessels of the glomeruli was observed, which was manifested by their increase in size. An increase in macrophage-type cells was observed in the perivascular areas. Histological examination of the spleen revealed a pretty large area of red pulp, moderate expansion and fullness of the sinusoids, and pronounced perisinusoidal edema. However, a rapid expansion of the white pulp was observed, which manifested in the formation of follicles.