Volume 54, Issue 8 pp. 2510-2514
Communication

Ratiometric Fluorescence Imaging of Cellular Polarity: Decrease in Mitochondrial Polarity in Cancer Cells

Na Jiang

Na Jiang

State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, 116024 Dalian (China)

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Jiangli Fan

Corresponding Author

Jiangli Fan

State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, 116024 Dalian (China)

State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, 116024 Dalian (China)Search for more papers by this author
Feng Xu

Feng Xu

State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, 116024 Dalian (China)

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Prof. Xiaojun Peng

Prof. Xiaojun Peng

State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, 116024 Dalian (China)

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Huiying Mu

Huiying Mu

State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, 116024 Dalian (China)

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Prof. Jingyun Wang

Prof. Jingyun Wang

School of Life Science and Biotechnology, Dalian University of Technology, 2 Linggong Road, 116024 Dalian (China)

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Xiaoqing Xiong

Xiaoqing Xiong

State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, 116024 Dalian (China)

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First published: 08 January 2015
Citations: 225

This research was financially supported by the NSF of China (21136002, 21376039, 21422601, and 21421005), the National Basic Research Program of China (2013CB733702), the Ministry of Education (NCET-12-0080), Liaoning NSF (2013020115), and Fundamental Research Funds for the Central Universities (DUT14ZD214).

Graphical Abstract

…︁ and BOB's your uncle: A fluorescent probe of mitochondrial polarity, termed BOB, showed a linear ratiometric fluorescence response to solution polarity. Various mitochondria of normal cells and cancer cells were examined, and it was found that mitochondrial polarity tends to be lower in cancer cells than in normal cells. The detection of mitochondrial polarity could thus be used as a method to distinguish cancer cells from normal cells.

Abstract

Mitochondrial polarity strongly influences the intracellular transportation of proteins and interactions between biomacromolecules. The first fluorescent probe capable of the ratiometric imaging of mitochondrial polarity is reported. The probe, termed BOB, has two absorption maxima (λabs=426 and 561 nm) and two emission maxima—a strong green emission (λem=467 nm) and a weak red emission (642 nm in methanol)—when excited at 405 nm. However, only the green emission is markedly sensitive to polarity changes, thus providing a ratiometric fluorescence response with a good linear relationship in both extensive and narrow ranges of solution polarity. BOB possesses high specificity to mitochondria (Rr=0.96) that is independent of the mitochondrial membrane potential. The mitochondrial polarity in cancer cells was found to be lower than that of normal cells by ratiometric fluorescence imaging with BOB. The difference in mitochondrial polarity might be used to distinguish cancer cells from normal cells.

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