Abstract
Morphological data on heart damage and its mechanisms due to extremely severe course of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) infection are limited, as well as data on the correlation of damage and expression of vitamin D receptors (VDRs). In this study, we analyzed a series of myocardial samples obtained during postmortem autopsy of 48 critically ill patients with COVID-19 who died with SARS-CoV-2-associated pneumonia. The purpose of the study was to evaluate immunohistochemical VDR expression in the myocardium. The results showed the only minimal or no immunohistochemical expression of VDR in the nuclei of cardiomyocytes in most cases, along with the persisted strong expression in lymphoid cells. To the best of our knowledge, it is the first study and data provided were regarding myocardial VDR expression in COVID-19 patients. The results are of interest in terms of further study of the effects of ligand-associated VDR activation on the cardiovascular system.
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