Experimental study of the antiulcer effect of cryopreserved placenta extract on a model of acetylsalicylic acid-induced ulcerogenesis

MESENCHYMAL STEM CELLS: EXOSOMES AND CONDITIONED MEDIA AS INNOVATIVE STRATEGIES IN THE TREATMENT OF PATIENTS WITH AUTOIMMUNE DISEASES

Introduction. Autoimmune diseases are a class of immunopathological conditions heterogeneous in clinical manifestations, characterized by immune disorders that cause the loss of the body's autoimmune tolerance and, as a result, abnormal reactivity of B-cells and T-cells, which leads to damage to own tissues. Today, about 10% of the population suffers from diseases of this class, which are clinically manifested in the form of more than 80 forms of autoimmune diseases. The aim of the study. Summarize current ideas about the therapeutic potential of conditioned media and exosomes of MSCs in the treatment of patients with autoimmune diseases based on data from open sources of information. Materials and methods. Publications were selected based on PubMed, Clinical Key Elsevier, Cochrane Library, eBook Business Collection and Google Scholar databases, which covered information on the use of conditioned media and MSC exosomes in the treatment of diseases of premature newborns using the Keywords: mesenchymal stem cells, conditioned media, secretion, autoimmune diseases. Results. The technical complexity and high costs associated with the production and regulatory approval procedures of MSC therapy create barriers to their clinical use. Studies have shown that the cell-free secretome of MSCs, which consists of a wide range of growth factors, cytokines, chemokines and extracellular vesicles, exhibits a pluripotent effect. Today, extracellular vesicles are classified according to their diameter into apoptotic bodies (>1000 nm), microvesicles (100–1000 nm) and exosomes (30–150 nm). Exosome activity can be easily manipulated by preconditioning MSCs, by simply adding cytokines or chemicals to the culture medium, by introducing gene modifications, or by using hypoxic culture conditions. A number of studies have demonstrated the comparable effectiveness of conditioned media and MSC exosomes in the treatment of patients with autoimmune diseases. Conclusions. Exosomes and conditioned media with MSCs have the potential to replace cell therapy or serve as a comparable clinical strategy to biological therapy in neonatology. MSC preconditioning will allow modulating the therapeutic effects of exosomes and will become the basis for establishing recommendations and standards for effective and safe cell-free therapy.

Role of cryopreserved placenta extract in prevention and treatment of paracetamol-induced hepatotoxicity in rats

Background/Aim: Drug-induced liver injury is one of the major causes of acute liver failure. Under current circumstances of the pandemic of COVID-19, the use of paracetamol which has a proven hepatotoxic effect has increased. This prompts the search for novel agents with hepatoprotective properties. The purpose of this article was to evaluate the hepatoprotective activity of cryoextract of the placenta (CEP) on the model of paracetamol-induced hepatitis. Methods: The study was performed on 28 male rats. Acute drug liver damage was modelled by intragastric administration of paracetamol twice at a dose of 1250 mg/kg. Results: The development of paracetamol-induced hepatitis in rats was accompanied by a 71.3 % increase (p < 0.001) in the content of active products of thiobarbituric acid (TBA-AP) in liver homogenates as compared with intact animals. Besides, there was a 2.1-fold (p < 0.001) increase of ALT activity, a 58.8 % increase (p < 0.001) of AST activity and a 4.2-fold (p < 0.001) increase of the concentration of total bilirubin as compared with intact rats. The use of cryopreserved placenta extract showed significant hepatoprotection in a rat model of paracetamol-induced hepatitis. This was demonstrated by a 2.3-fold (p < 0.01) increase of the antioxidant-prooxidant index, a significant (p < 0.001) decrease of activity of ALT (by 44.0 %) and AST (by 29.6 %), as well as by a decrease of direct bilirubin level by 52.5 % (p < 0.001) in animals treated with CEP as compared with rats without treatment. Conclusion: The development of acute paracetamol-induced hepatitis in rats was associated with activation of lipid peroxidation processes in liver tissues, while CEP showed marked hepatoprotective activity in paracetamol-induced hepatitis in rats.

Influence of Placenta Cryoextract on the Liver Metabolic and Functional State in Case of D-Galactosamine Hepatitis

Background. Viral hepatitis is one of the most common and dangerous diseases in the world and is the third most common infectious disease. The development of new, more effective and safer hepatoprotective drugs is an urgent task of biomedicine. A wide range of proven biological properties in cryoextract of human placenta, in particular the presence of antioxidant, immunomodulating and anti-inflammatory effects, suggests that it has a hepatoprotective effect. A model of D-galactosamine toxic hepatitis, which is similar to human viral hepatitis in terms of morphological and biochemical changes in the liver, was chosen for the study. Objective. We are aimed to study the effect of the therapeutic and preventive administration of cryopreserved placenta extract on the metabolic and functional state of the liver in the model of D-galactosamine hepatitis in rats. Methods. The study was conducted on 28 male rats weighing 200–220 g. Hepatitis was simulated by a single intraperitoneal injection of a 20% aqueous solution of D-galactosamine at a dose of 400 mg/kg. The cryoextract was administered in the treatment-prophylactic mode – 1 time per day for 3 days before the administration of D-galactosamine and another 2 days after the administration of the aminosugar (5 administrations in total). Results. The development of experimental D-galactosamine hepatitis in rats leads to the formation of functional and metabolic disorders in the form of the activation of lipid peroxidation processes, a violation of pigment metabolism, a decrease in the protein-synthesizing function and the development of cytolytic syndrome, which were indicated by an increase (p < 0.001) in the level of reactants with thiobarbituric acid in liver homogenates by 2.2 times, an increase (p < 0.001) in the level of total bilirubin by 2.5 times, a decrease (p < 0.001) in the albumin-globulin ratio by 46.8% and an increase (p < 0.001) in the level of alanine-aminotransferases by 2.2 times and the level of aspartate-aminotransferases by 70.3% compared to the values ​​of intact animals. Against the background of the administration of placenta cryoextract in experimental hepatitis, the level of reactants with thiobarbituric acid decreased (p < 0.001) by 43.8%, the level of alanine-aminotransferases decreased (p < 0.001) by 2.4 times, and the level of aspartate-aminotransferases decreased (p < 0.001) by 45.3%; the level of total protein increased (p < 0.01) by 17.4%, and the level of total bilirubin decreased (p < 0.001) by 53.5% compared to the indicators of untreated animals. Conclusions. Administration of cryopreserved placenta extract normalized metabolic processes in the liver and restored its functional state due to antioxidant and membrane-stabilizing effects, which weakened the cytolytic syndrome caused by the administration of D-galactosamine and restored the protein-synthesizing function of the liver. In addition, administration of the specified cryoextract neutralized D-galactosamine-induced hyperbilirubinemia.