THE EFFECT OF AUTOMESOCONCENTRATE OF PLATELETS ON THE STAGES OF REGENERATION OF THE LIVER REMNANT OF RATS UNDER THE CONDITIONS OF PERFORMING VOLUMETRIC EXPERIMENTAL LIVER RESECTIONS

Abstract

Introduction. Liver regeneration occurs in three stages, each of which is regulated by different factors: the initiation phase is regulated by interleukin 6 (IL-6) and tumor necrosis factor (TNFα); expansion phase – by hepatocyte growth factor (HGF) and transforming growth factor alpha (TGFα); the terminal phase – transforming growth factor beta (TGFβ) and activins. The work determined the level of markers of the main stages of liver regeneration after resection of 65-70% of the parenchyma of this organ in rats under the conditions of using different doses and schemes of administration of automesoconcentrate of platelets (AMС). The purpose of the study is to establish the characteristics of changes in the level of cytokines and growth factors in the homogenate of the liver of rats after resection of 65-70% of the parenchyma of this organ under the conditions of the use of different doses and schemes of AMС administration. Materials and methods. The study was conducted on white Wistar rats aged 1.5-2 months, weighing 150-180 g. AMС was injected: into the parenchyma of the liver remnant during resection at a dose of 0.5 ml/kg (group I); into the tail vein in the postoperative period at a dose of 0.5 ml/kg 3 hours and 48 hours after liver resection (group II); into the tail vein in the postoperative period at a dose of 1.0 ml/kg 3 hours and 48 hours after resection. Research results and discussion. It was shown that on the 7th day after liver resection, the level of TNF-α and IL-6 increased in all experimental groups, followed by a decrease on the 10th day to control values in the group of animals that received AMA intravenously at a dose of 1 ml/kg masses of animals. It was established that the values of HGF and TGFα in the liver homogenate of animals that underwent liver resection were significantly higher than in the control group on the 7th day of the experiment. At the later stages of the experiment, a decrease in the levels of HGF and TGFα in the liver homogenate was observed in the animals of groups I and III, but the studied indicators did not reach control values. In animals of group II, indicators of HGF and TGFα content remained at the highest level. The increase in the content of TGFβ and activins in the homogenate of the liver of rats in all experimental groups indicates the intensification of the terminal phase of liver regeneration on the 10th day after liver resection. Conclusions. Therefore, under the action of a dose of АМС equal to 1 ml/kg, the regeneration processes occur most intensively, the peak of which occurs 7-10 days after the resection. Administration of AMA into the liver parenchyma at a lower dose of 0.5 ml/kg or intravenous administration of the same dose does not contribute to the complete restoration of regenerative processes in the liver, as indicated by increased levels of TGFα and HGF on the 10th day after liver resection and administration of AMA.