Exosomes’ role in intercellular interactions in different variants of lung injury in fatal cases of COVID-19

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BACKGROUND

Extracellular vesicles are surrounded by a phospholipid bilayer, carrying various active biomolecules and participating in many physiological and pathological processes, including infectious ones.

OBJECTIVE

To research the role of exosomes in intercellular interactions in the pathogenesis of various types of lung damage in fatal cases of COVID-19.

MATERIAL AND METHODS

We conducted a clinical and morphological analysis of 118 fatal cases caused by coronavirus infection in Moscow. We selected 32 cases with morphological signs of various types of lung lesions for immunohistochemical reaction (IHC) with antibodies against tetraspanin proteins (CD63, CD81), which are involved in the assembly of exosomes, as well as with antibodies against viral proteins: nucleocapsid and spike protein. We determined the main producing cells of extracellular vesicles and cells containing viral proteins, carried out their comparison and quantitative analysis.

RESULTS

IHC reaction with antibodies against CD63 showed cytoplasmic granular uniform and subapical staining of cells, as well as granular extracellular staining. We determined similar staining using antibodies against viral proteins. Extracellular vesicles were found in the same cells as viral proteins. The main producing cells of vesicles and cells containing viral proteins were found to be macrophages, type II pneumocytes, and endothelial cells.

CONCLUSION

Taking into account the results of the literature, the localization of viral proteins and extracellular vesicles in the same cells indicates the key role of vesicles in the pathogenesis of various forms of lung damage by the SARS-CoV-2 virus, in the dissemination of the pathogen in the organism, which leads to interaction with the adaptive immune system and the formation of immunity.

Keywords:

COVID-19

extracellular vesicles

lungs

Authors:

Zarubin E.A.

I.M. Sechenov First Moscow State Medical University (Sechenov University);
Moscow Multidisciplinary Clinical Center «Kommunarka»

ORCID: 0000-0002-2548-9506

Kogan E.A.

Sechenov First Moscow State Medical University

ORCID: 0000-0002-1107-3753

Zharkov N.V.

Moscow Multidisciplinary Clinical Center «Kommunarka»

ORCID: 0000-0001-7183-0456

Avdalyan A.M.

Moscow Multidisciplinary Clinical Center «Kommunarka»

ORCID: 0000-0002-2229-1713

Procenko D.N.

Moscow Multidisciplinary Clinical Center «Kommunarka»

ORCID: 0000-0002-5166-3280

Received:

19.12.2023

Accepted:

27.12.2023

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