The proteome of Tunneling Nanotubes (TNTs) in U2OS cells; comparison with Extracellular Vesicles (EVs)
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ABSTRACT: Tunneling nanotubes (TNTs) are thin F-actin based membranous structures that form continuous cytoplasmic bridges between cells over distances ranging from several hundred nm up to 100 µm. They allow cell-to-cell communication by facilitating the transfer of different cargoes directly from cytoplasma to cytoplasma of the connected cells, including organelles (lysosomes, mitochondria), micro or mRNAs, pathogens, and misfolded proteins (for example prion proteins, tau or α-synuclein aggregates). TNTs could play major roles in various diseases, including neurodegenerative diseases or cancers of different types. TNT formation is highly dynamic and depends on cellular stresses and actin regulators. However, the mechanisms of TNT formation and TNT molecular components and regulators are still poorly understood. Because of their size, of some common components, of the ability to transfer cellular material to remote cells and because TNTs are fragile and easily broken and released in cell culture supernatants (where EVs are also found), TNTs were difficult to distinguish from EVs for their composition and function. With the goal of identifying structural components of TNTs, beside actin filaments, and possibly markers and regulators of these structures, we established a protocol of purification from U2OS cultured cells, allowing to separate TNTs from extracellular vesicles (EVs) and from cell bodies. We obtained the full composition of TNTs, compared to EVs.
INSTRUMENT(S): Q Exactive
ORGANISM(S): Homo Sapiens (human)
TISSUE(S): Cell Culture
SUBMITTER: MARIETTE MATONDO
LAB HEAD: Christel Brou
PROVIDER: PXD033089 | Pride | 2024-08-22
REPOSITORIES: Pride
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