Mass-Spectrometric Analysis of Proteome of Microvesicles Produced by NK-92 Natural Killer Cells

Membrane extracellular microvesicles serve as carriers of a wide range of molecules, the most important among these are proteins, lipids, and nucleic acids. Cytotoxic proteins of natural killer cells play a key role in the realization of their cytolytic functions. An important stage in understanding of the distant communication of cells and mechanisms of its regulation is analysis of the proteome composition of microvesicles. We studied the proteomic composition of microvesicles produced by NK-92 natural killer cells. Granzyme A, a specific protein of cytotoxic cells, has been identified in the microvesicles by QTOF-mass spectrometry. It was shown that heat shock proteins, components of the ubiquitin—proteasome system, enzymes of protein biosynthesis and energy metabolism, nuclear and serum proteins, as well as cytoskeleton proteins are associated with the microvesicles.