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Diketopyrrolopyrrole-based fluorescence probes for the imaging of lysosomal Zn2+ and identification of prostate cancer in human tissue.


ABSTRACT: A series of diketopyrrolopyrrole-based fluorescent probes (DPP-C2, LysoDPP-C2, LysoDPP-C3, and LysoDPP-C4) have been developed for the detection of low pH and Zn2+ in an AND logic fashion. The chelation of Zn2+ or the protonation of a morpholine moiety within these probes results in a partial increase in the fluorescence intensity, an effect ascribed to suppression of one possible photo-induced electron transfer (PET) pathway. In contrast, a large increase in the observed fluorescence intensity is observed at low pH and in the presence of Zn2+; this is rationalized in terms of both possible PET pathways within the probes being blocked. Job plots, fluorescence titration curves, and isothermal titration calorimetry proved consistent with a 1?:?1 Zn2+ complexation stoichiometry. Each probe demonstrated an excellent selectivity towards Zn2+ and the resulting Zn2+ complexes demonstrated pH sensitivity over the 3.5-9 pH range. Fluorescence imaging experiments confirmed that LysoDPP-C4 was capable of imaging lysosomal Zn2+ in live cells. Little evidence of cytotoxicity was seen. LysoDPP-C4 was successfully applied to the bioimaging of nude mice, wherein it was shown capable of imaging the prostate. Histological studies using a human sample revealed that LysoDPP-C4 can discriminate cancerous prostate tissue from healthy prostate tissue.

SUBMITTER: Du C 

PROVIDER: S-EPMC6568042 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Diketopyrrolopyrrole-based fluorescence probes for the imaging of lysosomal Zn<sup>2+</sup> and identification of prostate cancer in human tissue.

Du Chenchen C   Fu Shibo S   Wang Xiaohua X   Sedgwick Adam C AC   Zhen Wei W   Li Minjie M   Li Xinqiang X   Zhou Juan J   Wang Zhong Z   Wang Hongyu H   Sessler Jonathan L JL  

Chemical science 20190501 22


A series of diketopyrrolopyrrole-based fluorescent probes (<b>DPP-C2</b>, <b>LysoDPP-C2</b>, <b>LysoDPP-C3</b>, and <b>LysoDPP-C4</b>) have been developed for the detection of low pH and Zn<sup>2+</sup> in an AND logic fashion. The chelation of Zn<sup>2+</sup> or the protonation of a morpholine moiety within these probes results in a partial increase in the fluorescence intensity, an effect ascribed to suppression of one possible photo-induced electron transfer (PET) pathway. In contrast, a larg  ...[more]

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