申请人:The Board of Trustees of the University of Illinois
公开号:US20200140452A1
公开(公告)日:2020-05-07
Detection of nitroxyl (HNO), the transient one-electron reduced form of nitric oxide, is a significant challenge owing to its high reactivity with biological thiols (rate constants as high as 10
9
M
−1
s
−1
). Reported herein is a new thiol-based HNO-responsive trigger that can compete against reactive thiols for HNO. This process forms an N-hydroxysulfenamide intermediate which cyclizes to release a masked fluorophore leading to fluorescence enhancement. To ensure a rapid cyclization step, the disclosed design capitalizes on two established physical organic phenomena: the alpha-effect and the Thorpe-Ingold effect. Using this new trigger, NitroxylFluor was developed; a selective HNO-responsive fluorescent probe. Treatment of NitroxylFluor with an HNO donor results in a 16-fold turn-on. This probe also exhibits excellent selectivity over various reactive nitrogen, oxygen, and sulfur species and efficacy in the presence of thiols (e.g., glutathione in mM concentrations). Also, live cell imaging of HNO using NitroxylFluor was performed.
氮氧化物(HNO)的检测是一个重要挑战,因为它与生物硫醇具有很高的反应性(速率常数高达10^9 M^-1s^-1)。本文报道了一种新的基于硫醇的HNO响应触发器,可以与反应性硫醇竞争HNO。这个过程形成了一种N-羟基磺酰胺中间体,它环化释放出一个掩蔽的荧光团,导致荧光增强。为了确保快速的环化步骤,所披露的设计利用了两种已建立的物理有机现象:α效应和Thorpe-Ingold效应。利用这种新的触发器,开发了NitroxylFluor;一种选择性的HNO响应荧光探针。将NitroxylFluor与HNO供体处理会导致16倍的开启。该探针还表现出对各种反应性氮、氧和硫物种的优异选择性,以及在硫醇存在的情况下(例如,以毫摩尔浓度存在的谷胱甘肽)的有效性。此外,使用NitroxylFluor进行了HNO的活细胞成像。