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research article

Tape-Stripping Electrochemical Detection of Melanoma

Darvishi, Sorour  
•
Pick, Horst  
•
Lin, Tzu-En  
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October 15, 2019
Analytical Chemistry

A noninvasive electrochemical melanoma detection approach based on using adhesive tapes for collecting and fixing cells from a suspicious skin area and transferring the cells into a scanning electrochemical microscope (SECM) is presented. The adhesive layer collects the cells reproducibly and keeps them well adhered on the tape during experiments in an electrolyte solution. A melanoma biomarker, here the intracellular enzyme tyrosinase (TYR), was imaged on the tape-collected cells without further cell lysing using antibodies that were labeled with horseradish peroxidase (HRP). The HRP labels catalyzed the oxidation of a dissolved redox-active species, which was detected at a soft microelectrode, gently brushed in contact mode over the tape. The melanoma biomarker was first detected on tape-stripped samples with murine melanoma cells of different concentrations. Thereafter, increasing levels of TYR were recorded in cells that were collected from the skin of melanoma mouse models representing three different stages of tumor growth. Additionally, SECM results of tape-stripped different human melanoma cell lines were confirmed by previous studies based on traditionally fixed and permeabilized cells.

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Type
research article
DOI
10.1021/acs.analchem.9b02819
Web of Science ID

WOS:000491219900039

Author(s)
Darvishi, Sorour  
Pick, Horst  
Lin, Tzu-En  
Zhu, Yingdi  
Li, Xiaoyun
Ho, Ping-Chih
Girault, Hubert H.  
Lesch, Andreas  
Date Issued

2019-10-15

Publisher

AMER CHEMICAL SOC

Published in
Analytical Chemistry
Volume

91

Issue

20

Start page

12900

End page

12908

Subjects

Chemistry, Analytical

•

Chemistry

•

microscopy

•

tyrosinase

•

cells

•

diagnosis

•

exosomes

•

dna

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LEPA  
Available on Infoscience
November 3, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/162640
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