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2014 ; 105
(10
): 1299-306
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In vivo subcellular imaging of tumors in mouse models using a
fluorophore-conjugated anti-carcinoembryonic antigen antibody in two-photon
excitation microscopy
#MMPMID25117702
Koga S
; Oshima Y
; Honkura N
; Iimura T
; Kameda K
; Sato K
; Yoshida M
; Yamamoto Y
; Watanabe Y
; Hikita A
; Imamura T
Cancer Sci
2014[Oct]; 105
(10
): 1299-306
PMID25117702
show ga
Recently, there has been growing interest in applying fluorescence imaging
techniques to the study of various disease processes and complex biological
phenomena in vivo. To apply these methods to clinical settings, several groups
have developed protocols for fluorescence imaging using antibodies against tumor
markers conjugated to fluorescent substances. Although these probes have been
useful in macroscopic imaging, the specificity and sensitivity of these methods
must be improved to enable them to detect micro-lesions in the early phases of
cancer, resulting in better treatment outcomes. To establish a sensitive and
highly specific imaging method, we used a fluorophore-conjugated
anti-carcinoembryonic antigen (CEA) antibody to perform macroscopic and
microscopic in vivo imaging of inoculated cancer cells expressing GFP with or
without CEA. Macroscopic imaging by fluorescence zoom microscopy revealed that
bio-conjugation of Alexa Fluor 594 to the anti-CEA antibody allowed visualization
of tumor mass consisting of CEA-expressing human cancer cells, but the background
levels were unacceptably high. In contrast, microscopic imaging using a
two-photon excitation microscope and the same fluorescent antibody resulted in
subcellular-resolution imaging that was more specific and sensitive than
conventional imaging using a fluorescence zoom microscope. These results suggest
that two-photon excitation microscopy in conjunction with fluorophore-conjugated
antibodies could be widely adapted to detection of cancer-specific cell-surface
molecules, both in cancer research and in clinical applications.