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Ratiometric emission NIR-fluorescent probe for the detection of lysosomal pH in living cells and in vivo

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Abstract

The lysosome is known to be an acidic organelle that is ubiquitous in cells. Acidic pH is a characteristic feature of lysosomes, and aberrant lysosomal pH values have been manifested to be associated with diverse diseases. In order to monitor the lysosomal pH changes, we developed a ratiometric emission NIR-fluorescent probe (CzQl) for the quantitative analysis of the lysosomal pH in living cells and in vivo. CzQl was constructed via the ethylene bridging of carbazole derivatives and quinoline. The protonation of the probe resulted in a marked green-to-red emission color change. The probe exhibited an ideal pKa value of 4.60 with a linear relationship in the pH range of 3.9–5.3, which covered most of the pH ranges of lysosomes, and was useful for the quantitative detection and imaging of lysosomal pH changes. Moreover, CzQl exhibited easy loading capability, high selectivity, a large Stokes shift, specific lysosome-targeting ability and low cytotoxicity; thereby, it was successfully used for monitoring the lysosomal pH changes at a cellular level as well as the LPS-mediated inflammation in vivo.

Graphical abstract: Ratiometric emission NIR-fluorescent probe for the detection of lysosomal pH in living cells and in vivo

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Publication details

The article was received on 28 May 2019, accepted on 15 Jul 2019 and first published on 31 Jul 2019


Article type: Paper
DOI: 10.1039/C9NJ02771H
New J. Chem., 2019, Advance Article

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    Ratiometric emission NIR-fluorescent probe for the detection of lysosomal pH in living cells and in vivo

    W. Niu, J. Jia, J. Li, C. Zhang and K. Yun, New J. Chem., 2019, Advance Article , DOI: 10.1039/C9NJ02771H

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