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2014 ; 843
(ä): 73-82
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Imaging of epidermal growth factor receptor on single breast cancer cells using
surface-enhanced Raman spectroscopy
#MMPMID25150698
Xiao L
; Harihar S
; Welch DR
; Zhou A
Anal Chim Acta
2014[Sep]; 843
(ä): 73-82
PMID25150698
show ga
Epidermal growth factor receptor (EGFR) is widely used as a biomarker for
pathological grading and therapeutic targeting of human cancers. This study
investigates expression, spatial distribution as well as the endocytosis of EGFR
in single breast cancer cells using surface-enhanced Raman spectroscopy (SERS).
By incubating anti-EGFR antibody conjugated SERS nanoprobes with an
EGFR-over-expressing cancer cell line, A431, EGFR localization was measured over
time and found to be located primarily at the cell surface. To further validate
the constructed SERS probes, we applied this SERS probes to detect the EGFR
expression on breast cancer cells (MDA-MB-435, MDA-MB-231) and their counterpart
cell lines in which EGFR expression was down-regulated by breast cancer
metastasis suppressor 1 (BRMS1). The results showed that SERS method not only
confirms immunoblot data measuring EGFR levels, but also adds new insights
regarding EGFR localization and internalization in living cells which is
impossible in immunoblot method. Thus, SERS provides a powerful new tool to
measure biomarkers in living cancer cells.