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2017 ; 7
(ä): 43025
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High-resolution imaging of living mammalian cells bound by nanobeads-connected
antibodies in a medium using scanning electron-assisted dielectric microscopy
#MMPMID28230204
Okada T
; Ogura T
Sci Rep
2017[Feb]; 7
(ä): 43025
PMID28230204
show ga
Nanometre-scale-resolution imaging technologies for liquid-phase specimens are
indispensable tools in various scientific fields. In biology, observing untreated
living cells in a medium is essential for analysing cellular functions. However,
nanoparticles that bind living cells in a medium are hard to detect directly
using traditional optical or electron microscopy. Therefore, we previously
developed a novel scanning electron-assisted dielectric microscope (SE-ADM)
capable of nanoscale observations. This method enables observation of intact
cells in aqueous conditions. Here, we use this SE-ADM system to clearly observe
antibody-binding nanobeads in liquid-phase. We also report the successful direct
detection of streptavidin-conjugated nanobeads binding to untreated cells in a
medium via a biotin-conjugated anti-CD44 antibody. Our system is capable of
obtaining clear images of cellular organelles and beads on the cells at the same
time. The direct observation of living cells with nanoparticles in a medium
allowed by our system may contribute the development of carriers for drug
delivery systems (DDS).