Technology

Nanoscale biophysical properties of small extracellular vesicles from senescent cells utilizing atomic power microscopy, floor potential microscopy, and Raman spectroscopy


Cells secrete extracellular vesicles (EVs) carrying cell-of-origin markers to speak with surrounding cells. EVs regulate physiological processes starting from intercellular signaling to waste administration. Nevertheless, when senescent cells (SnCs) secrete EVs, the EVs, that are newly thought to be senescence-associated secretory phenotype (SASP) components, can evoke irritation, senescence induction, and metabolic problems in neighboring cells. Not like different soluble SASP components, the biophysical properties of EVs, together with small EVs (sEVs), derived from SnCs haven’t but been investigated. On this research, sEVs had been extracted from a human IMR90 lung fibroblast in vitro senescence mannequin. Their biomechanical properties had been mapped utilizing atomic power microscopy-based quantitative nanomechanical strategies, floor potential microscopy, and Raman spectroscopy. The surfaces of sEVs derived from SnCs are barely stiffer however their cores are softer than these of sEVs secreted from non-senescent cells (non-SnCs). This inversely proportional relationship between deformation and stiffness, attributed to a lower within the focus of genetic and protein supplies contained in the vesicles and the adsorption of positively charged SASP components onto the vesicle surfaces, respectively, was discovered to be a peculiar attribute of SnC-derived sEVs. Our outcomes exhibit that the biomechanical properties of SnC-derived sEVs differ from these of non-SnC-derived sEVs and supply perception into the mechanisms underlying their formation and composition.

Graphical abstract: Nanoscale biophysical properties of small extracellular vesicles from senescent cells using atomic force microscopy, surface potential microscopy, and Raman spectroscopy

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