Mechanisms of acute kidney injury in Covid-19. Review

The most important feature of acute kidney injury (AKI) in COVID-19 is the absence of a single main link of pathogenesis. A thorough understanding of the mechanisms and main links of the pathogenesis of the disease will allow the identifi cation of early markers of AKI, which will contribute to early diagnosis, prognosis, personalized therapy and prevention of kidney damage in patients with COVID-19. Aim: to summarize data from clinical and scientifi c studies on the known mechanisms of AKI in COVID- 19. To identify markers of early kidney injury in COVID-19. Materials and methods. In the Web of Science, Scopus and RSCI databases, 81 sources were selected that contained relevant data from clinical and scientifi c researches on the topic of this review. Results: the main reported mechanisms of kidney damage in COVID-19 patients are as follows: intracellular activity of the virus leading to cell death, excessive release of pro-infl ammatory cytokines and cytokine storm, pathology of the renin-angiotensin-aldosterone system (RAAS), hyperergic infl ammation and immunothrombosis. The main effects of angiotensin II in the case of dysregulation of the RAAS, as well as the spectrum of pro-infl ammatory cytokines and their functions in the development of the cytokine storm, were determined. The possibility of a direct cytopathic effect of SARS-CoV-2 on the renal epithelium as an independent cause of AKI in COVID-19 was considered. The association between the hyperergic infl ammatory response and the process of immunothrombosis, which is mediated by many defense systems, including neutrophils, platelets and proteins of the complement system was presented. The risk of thrombotic complications in the renal vessels in patients with COVID-19 was anaysed. An analysis of potential early biomarkers of kidney injury in COVID-19 were also presented and compared with clinical biomarkers of AKI. Conclusions: AKI is one of the most common complications in critically ill patients with COVID-19, which signifi cantly worsens the prognosis of the disease. The study of the mechanisms of kidney injury contributes to the discovery of new markers necessary for early diagnosis, prognosis of the course of the disease, and further determination of the optimal personalized therapy. © 2021 JSC Vidal Rus. All Rights Reserved.