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2016 ; 6
(ä): 37246
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Digital Detection of Exosomes by Interferometric Imaging
#MMPMID27853258
Daaboul GG
; Gagni P
; Benussi L
; Bettotti P
; Ciani M
; Cretich M
; Freedman DS
; Ghidoni R
; Ozkumur AY
; Piotto C
; Prosperi D
; Santini B
; Ünlü MS
; Chiari M
Sci Rep
2016[Nov]; 6
(ä): 37246
PMID27853258
show ga
Exosomes, which are membranous nanovesicles, are actively released by cells and
have been attributed to roles in cell-cell communication, cancer metastasis, and
early disease diagnostics. The small size (30-100?nm) along with low refractive
index contrast of exosomes makes direct characterization and phenotypical
classification very difficult. In this work we present a method based on Single
Particle Interferometric Reflectance Imaging Sensor (SP-IRIS) that allows
multiplexed phenotyping and digital counting of various populations of individual
exosomes (>50?nm) captured on a microarray-based solid phase chip. We demonstrate
these characterization concepts using purified exosomes from a HEK 293 cell
culture. As a demonstration of clinical utility, we characterize exosomes
directly from human cerebrospinal fluid (hCSF). Our interferometric imaging
method could capture, from a very small hCSF volume (20?uL), nanoparticles that
have a size compatible with exosomes, using antibodies directed against
tetraspanins. With this unprecedented capability, we foresee revolutionary
implications in the clinical field with improvements in diagnosis and
stratification of patients affected by different disorders.