REDUCED DYE PROBES FOR THE DETECTION OF RADICAL OXYGEN SPECIES
申请人:Murthy Niren
公开号:US20110070166A1
公开(公告)日:2011-03-24
Reduced dyes, such as hydrocyanines, deuterocyanines, and/or other deuterated dyes capable of detecting one or more reactive oxygen species are described herein. The reduced dyes exhibit little or no fluorescence due to the disrupted π conjugation. However, upon reaction with ROS, the reduced dyes are oxidized, regenerating the extended π conjugation and causing a substantial increase in fluorescence intensity. In many case, the oxidized dye is generally membrane impermeable. However, upon reduction, many of the reduced dyes are membrane permeable. Thus, reduced dyes can accumulate in cells and/or tissue to amplify the signal. Once inside the cell or tissue, the reduced dye is reoxidized upon reaction with ROS, and the oxidized dye again becomes membrane impermeable, trapping the dye within the cell. The reduced dyes can be used to image ROS, such as hydroxide radical and superoxide, in serum, cell cultures, tissue explants, and in vivo.
A Significant Improvement of the Efficacy of Radical Oxidant Probes by the Kinetic Isotope Effect
作者:Kousik Kundu、Sarah F. Knight、Seungjun Lee、W. Robert Taylor、Niren Murthy
DOI:10.1002/anie.201002228
日期:2010.8.16
A breath of fresh air: The rate of aerial oxidation of dihydroethidium and hydrocyanine radical oxidant probes can be selectively reduced by deuteration (see picture). The reaction rate between the deuterated compounds and the superoxide radical was reduced by a much smaller factor because of mechanistic differences between the two reactions. The deuterated probes are more effective than their hydrogen