A novel "dual-locked" fluorescent probe for ONOO- and viscosity enables serum-based rapid disease screening

作者：Shi, Baotang; Wang, Huiling; Wan, Xingxia; Guo, Yu; Liu, Shi-Yu^*; Gong, Quan^*

来源：Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy , 2022, 278: 121375.

DOI：10.1016/j.saa.2022.121375

• "Dual-locked"
• Fluorescent probe
• Peroxynitrite
• Viscosity
• Rapid disease screening

Peroxynitrite (ONOO-) plays important roles in the progression of important disease such as inflammation, cancer, and diabetes, which made it an attractable target for biosensor development. However, to detect ONOO- solely is highly dependent on the sensitivity of the detection method and may be disturbed by unwillingly false-positive signal. Cellular viscosity is an important microenvironmental parameter and its abnormal changes are closely related to diseases such as diabetes and cancer. In this case, to construct a "dual-locked " molecular tool for both ONOO- and viscosity sensing and to evaluate the performance such strategy in disease diagnosis is of great importance. We herein firstly reported the construction of novel "dual-locked " probe DCI-OV which showed capability for simultaneous measuring ONOO- concentration and system viscosity with high sensitivity (LOD = 4.7 nM) and high specificity. Moreover, both exogenous and low level of endogenous ONOO- in living cells could be detected using DCI-OV due to viscosity amplified signal. Furthermore, cancer cells and insulin-resistant cells could be easily distinguished using DCI-OV. By taking advantage of the "dual-locked " sensing strategy, a total of 85 samples of human serum were screened using DCI-OV based rapid disease screening method and it was capable of differentiated and subdivided patients into specific type of disease, indicating the great potential of application of DCI-OV into clinical related disease diagnosis.