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2015 ; 15
(9
): 24178-90
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English Wikipedia
Continuous-Wave Stimulated Emission Depletion Microscope for Imaging Actin
Cytoskeleton in Fixed and Live Cells
#MMPMID26393614
Neupane B
; Jin T
; Mellor LF
; Loboa EG
; Ligler FS
; Wang G
Sensors (Basel)
2015[Sep]; 15
(9
): 24178-90
PMID26393614
show ga
Stimulated emission depletion (STED) microscopy provides a new opportunity to
study fine sub-cellular structures and highly dynamic cellular processes, which
are challenging to observe using conventional optical microscopy. Using actin as
an example, we explored the feasibility of using a continuous wave (CW)-STED
microscope to study the fine structure and dynamics in fixed and live cells.
Actin plays an important role in cellular processes, whose functioning involves
dynamic formation and reorganization of fine structures of actin filaments.
Frequently used confocal fluorescence and STED microscopy dyes were employed to
image fixed PC-12 cells (dyed with phalloidin- fluorescein isothiocyante) and
live rat chondrosarcoma cells (RCS) transfected with actin-green fluorescent
protein (GFP). Compared to conventional confocal fluorescence microscopy, CW-STED
microscopy shows improved spatial resolution in both fixed and live cells. We
were able to monitor cell morphology changes continuously; however, the number of
repetitive analyses were limited primarily by the dyes used in these experiments
and could be improved with the use of dyes less susceptible to photobleaching. In
conclusion, CW-STED may disclose new information for biological systems with a
proper characteristic length scale. The challenges of using CW-STED microscopy to
study cell structures are discussed.