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J Biomed Opt. 2009 Mar-Apr;14(2):021004. doi: 10.1117/1.3122775.

Fluorescent immunolabeling of cancer cells by quantum dots and antibody scFv fragment.

Author information

1
Russian Academy of Sciences, M. M. Shemyakin and Yu. A. Ovchinnikov Institute of Bioorganic Chemistry, Ul. Miklukho-Maklaya, 16/10, 117997 GSP, Moscow V-437, Russia. liskaW@mail.ru

Abstract

Semiconductor quantum dots (QDs) coupled with cancer-specific targeting ligands are new promising agents for fluorescent visualization of cancer cells. Human epidermal growth factor receptor 2/neu (HER2/neu), overexpressed on the surface of many cancer cells, is an important target for cancer diagnostics. Antibody scFv fragments as a targeting agent for direct delivery of fluorophores offer significant advantages over full-size antibodies due to their small size, lower cross-reactivity, and immunogenicity. We have used quantum dots linked to anti-HER2/neu 4D5 scFv antibody to label HER2/neu-overexpressing live cells. Labeling of target cells was shown to have high brightness, photostability, and specificity. The results indicate that construction based on quantum dots and scFv antibody can be successfully used for cancer cell visualization.

PMID:
19405717
DOI:
10.1117/1.3122775
[Indexed for MEDLINE]

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