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• W3211362148 abstract "The distribution of surface charge and potential of cell membrane plays an indispensable role in cellular activities. However, probing surface charge of live cells under physiological conditions, until recently, remains an arduous challenge owing to the lack of effective methods. Scanning ion conductance microscopy (SICM) is an emerging imaging technique for imaging a live cell membrane in its native state. Here, we introduce a simple SICM based imaging technique to effectively map the surface charge contrast distribution of soft substrates including cell membranes by utilizing the higher surface charge sensitivity of the ionic current when the nanopipette tip is close to the substrate with a relatively high current change. This technique was assessed on charged model substrates made of polydimethylsiloxane, and the surface charge sensitivity of ionic current change was supported by finite element method simulations. With this method, we can distinguish the surface charge difference between the cell membrane and the supporting collagen matrix. We also observed the surface charge change induced by the small membrane damage after 1% dimethyl sulfoxide (DMSO) treatment. This new SICM technique provides opportunities to study interfacial and cell membrane processes with high spatial resolution." @default.
• W3211362148 created "2021-11-22" @default.
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• W3211362148 date "2021-01-01" @default.
• W3211362148 modified "2023-10-07" @default.
• W3211362148 title "Gauging surface charge distribution of live cell membrane by ionic current change using scanning ion conductance microscopy" @default.
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• W3211362148 doi "https://doi.org/10.1039/d1nr05230f" @default.
• W3211362148 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34825684" @default.
• W3211362148 hasPublicationYear "2021" @default.
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