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1.
Anal Chem ; 93(36): 12434-12440, 2021 09 14.
Artigo em Inglês | MEDLINE | ID: mdl-34473470

RESUMO

The ability to accurately diagnose cancer is the cornerstone of early cancer treatment. The mitochondria in cancer cells maintain a higher pH and lower polarity relative to that in normal cells. A probe that reports signals only when both conditions are met may provide a reliable method for cancer detection with reduced false positives. Here, we construct an AND logic gate fluorescent probe using mitochondrial microenvironments as inputs. Utilizing the hydrolysis of a coumarin scaffold, the probe generates fluorescence signals ("ON") only when high pH (>7.0) and low polarity conditions exist simultaneously. Additionally, the higher mitochondrial membrane potential in cancer cells provides an additional level of selectivity because probe has increased affinity for cancer cell mitochondria. These capabilities endow the probe with a high contrast fluorescence diagnosis ability of cancer at cellular and tissue levels (as high as 51.9 fold), which is far exceeding the clinic threshold of 2.0 fold.


Assuntos
Lógica , Neoplasias , Cumarínicos , Fluorescência , Corantes Fluorescentes , Hidrólise , Neoplasias/diagnóstico
2.
Anal Chem ; 92(24): 16130-16137, 2020 12 15.
Artigo em Inglês | MEDLINE | ID: mdl-33237734

RESUMO

As vital important bioactive species, human serum albumin (HSA) and sulfur dioxide (SO2) are essential molecules in the organisms and act a pivotal part in many biological events. Although studies have shown that SO2-induced HSA radicals can cause oxidative damage, the underlying mechanism of the synergistic effect of HSA and SO2 in various diseases is obscure, mainly because of the lack of powerful tools that can simultaneously detect HSA and SO2 in living systems. In this work, we report a novel single-site, double-sensing fluorescent probe 1 for the simultaneous detection of HSA and SO2. The probe is based on our finding that HSA can catalyze a Michael addition reaction between the probe and SO2, which induces a change in fluorescence. Probe 1 can effectively entered the endoplasmic reticulum and can be used to image exogenously introduced and de novo synthesis of HSA in endoplasmic reticulum. Furthermore, the simultaneous detection of HSA and SO2 was realized for the first time with probe 1. More important, we observed that HSA still retains its activity to catalyze the Michael addition reaction of 1 and SO2 in living cells, which may provide a significant boost in the study of the role of HSA in medicine and pharmacy.


Assuntos
Albumina Sérica Humana/análise , Dióxido de Enxofre/análise , Catálise , Sobrevivência Celular , Corantes Fluorescentes/química , Células HeLa , Humanos , Albumina Sérica Humana/química , Albumina Sérica Humana/urina , Dióxido de Enxofre/química , Dióxido de Enxofre/urina
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