Role of exosomes in pathogenesis of pulmonary diseases (review)

Abstract

The article presents modern data on exosomes - microscopic extracellular vesicles with a diameter of 30-180 nanometers, released into the intercellular space by cells of the respiratory organs. The cells of the body’s respiratory system secrete exosomes into the intercellular space in a normal state, as well as during the development of the disease. The concentration of exosomes depends on the type of cell and includes mRNA, miRNAs, DNA and signaling proteins. Some exosomal proteins, such as CD63, CD81, CD9, CD24 and heat shock protein (Hsp70) are universal and they are usually used as exosomal markers. In respiratory diseases, in particular in patients with chronic obstructive pulmonary disease, IL-1P and miRNAs such as miR-15b, miR-223, miR-1274a, miR-424, mir-210 are significantly increased; miR-21 is the most common miRNA isolated from lung tissue, increased expression of this RNA is associated with symptoms of asthma, idiopathic pulmonary fibrosis and lung cancer. Exosome analysis makes it possible to distinguish between pulmonary and extrapulmonary forms of tuberculosis based on exosomal markers such as MPT64. Circulating exosomes are stable in biological fluids; therefore, analysis of exosomal microRNAs may indicate the state of the human respiratory system. This review opens up the possibility of using new diagnostic and therapeutic targets for various diseases of the respiratory system.