AGE FEATURES OF THE STRUCTURE OF THE BLOOD VESSELS OF THE SOME DIGESTIVE GLANDS AND ITS RESTRUCTURING IN THE INITIAL STAGES OF EXPERIMENTAL DIABETES MELLITUS

Abstract

The aim: The purpose of the work was to study the peculiarities of blood supply the pancreatic islet of the 24-month-old rat, and its restructuring during the initial periods of experimental diabetes mellitus. Materials and methods: The work was performed on 20 white outbred rats - males weighing 340-420g. 24 months of age, kept in standard vivarium conditions in compliance with all accepted ethical rules. Experimental streptozotocin diabetes mellitus was simulated in 16 animals. The material was taken on the 14th and 28th day of the experiment. Results: Reorganization of the endocrine part of the pancreas in the early stages of experimental diabetes is characterized by a decrease in the number and area of pancreatic islets, a decrease in the diameter of the lumen of arterioles, precapillaries, postcapillaries compared to the control group of animals by 7% and 5%. The diameter of the capillaries decreases by 16% and reaches 3.8 ± 0.62 μm2, and the diameter of the venules increases by 12%. In some blood vessels there are phenomena of desolation and edema of perivascular connective tissue, which is manifested by a decrease in optical density and stratification of collagen fibers. Conclusions: Thus, the reorganization of the circulatory system of the endocrine part of the pancreas of 24-month-old rats in the early stages of experimental diabetes mellitus is characterized by a decrease in the number and area of pancreatic islets.