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2017 ; 12
(2
): e0173050
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Aptamers provide superior stainings of cellular receptors studied under
super-resolution microscopy
#MMPMID28235049
Gomes de Castro MA
; Höbartner C
; Opazo F
PLoS One
2017[]; 12
(2
): e0173050
PMID28235049
show ga
Continuous improvements in imaging techniques are challenging biologists to
search for more accurate methods to label cellular elements. This is particularly
relevant for diffraction-unlimited fluorescence imaging, where the perceived
resolution is affected by the size of the affinity probes. This is evident when
antibodies, which are 10-15 nm in size, are used. Previously it has been
suggested that RNA aptamers (~3 nm) can be used to detect cellular proteins under
super-resolution imaging. However, a direct comparison between several aptamers
and antibodies is needed, to clearly show the advantages and/or disadvantages of
the different probes. Here we have conducted such a comparative study, by testing
several aptamers and antibodies using stimulated emission depletion microscopy
(STED). We have targeted three membrane receptors, EGFR, ErbB2 and Epha2, which
are relevant to human health, and recycle between plasma membrane and
intracellular organelles. Our results suggest that the aptamers can reveal more
epitopes than most antibodies, thus providing a denser labeling of the stained
structures. Moreover, this improves the overall quality of the information that
can be extracted from the images. We conclude that aptamers could become useful
fluorescent labeling tools for light microscopy and super-resolution imaging, and
that their development for novel targets is imperative.