Introduction. Currently, the possibilities of cell therapy using stem cells for the correction of functional disorders of organs, including kidneys, are being widely investigated. The main mechanism of action of stem cells is considered to be the activation of cellular regeneration and the inhibition of apoptosis by the products of their secretion (secretome), which makes it necessary to study the mechanisms of action of the stem cells secretome. Aim of study. To study the relationship of the nephroprotective effect of the drug, which is a protein-peptide secretom of embryonic brain cells (SESC), with its effect on the regeneration of kidney cells damaged by ischemia and the activity of their apoptosis. Material and methods. Experiments were carried out on 40 mongrel male rats weighing 280-320 g. Acute kidney injury of varying severity was caused by removal of the right kidney and ischemia of the remaining left kidney for 60 minutes or 90 minutes (20 rats per group). In each of these groups, 10 rats were injected daily subcutaneously with SESC at a dose of 0.1 ml/kg (10 injections), and the other 10 rats were not treated. After 3, 7 and 14 days, the ischemic kidney was removed and
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