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2013 ; 34
(20-21
): 2970-9
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Characterization of a hybrid dielectrophoresis and immunocapture microfluidic
system for cancer cell capture
#MMPMID23925921
Huang C
; Santana SM
; Liu H
; Bander NH
; Hawkins BG
; Kirby BJ
Electrophoresis
2013[Nov]; 34
(20-21
): 2970-9
PMID23925921
show ga
The capture of circulating tumor cells (CTCs) from cancer patient blood enables
early clinical assessment as well as genetic and pharmacological evaluation of
cancer and metastasis. Although there have been many microfluidic immunocapture
and electrokinetic techniques developed for isolating rare cancer cells, these
techniques are often limited by a capture performance tradeoff between high
efficiency and high purity. We present the characterization of shear-dependent
cancer cell capture in a novel hybrid DEP-immunocapture system consisting of
interdigitated electrodes fabricated in a Hele-Shaw flow cell that was
functionalized with a monoclonal antibody, J591, which is highly specific to
prostate-specific membrane antigen expressing prostate cancer cells. We measured
the positive and negative DEP response of a prostate cancer cell line, LNCaP, as
a function of applied electric field frequency, and showed that DEP can control
capture performance by promoting or preventing cell interactions with
immunocapture surfaces, depending on the sign and magnitude of the applied DEP
force, as well as on the local shear stress experienced by cells flowing in the
device. This work demonstrates that DEP and immunocapture techniques can work
synergistically to improve cell capture performance, and it will aid in the
design of future hybrid DEP-immunocapture systems for high-efficiency CTC capture
with enhanced purity.