Pro-fluorescent probes for selective H2O2 imaging
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Solution Overview
Problem
Current H2O2-responsive probes face challenges such as interfering background fluorescence, need for external activating enzymes, lack of water solubility, and excitation profiles that cause photodamage and autofluorescence, limiting their effectiveness in selectively detecting hydrogen peroxide in biological systems.
Innovation Solution
Development of pro-fluorescent compounds that undergo chemoselective boronate deprotection to create highly selective and sensitive fluorescent probes, which are biologically compatible, have visible excitation and emission profiles, and can be passively loaded into cells to image micromolar H2O2 changes using confocal and two-photon microscopy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional H2O2 probes are used, then H2O2 detection is possible, but background fluorescence from competing ROS interferes with selectivity
Solution Approach 1:
The probe design converts the potentially harmful effect of ROS interaction into a beneficial selective detection mechanism. The probe contains a fluorogenic group that remains non-fluorescent until it reacts specifically with H2O2, transforming the presence of ROS from a source of background noise into a trigger for specific signal generation. This chemoselective activation ensures that only H2O2 produces the fluorescent signal, eliminating background fluorescence from other ROS.
Solution Approach 2:
The probe utilizes changes in fluorescence emission parameters (intensity, wavelength) upon H2O2 reaction to achieve selective detection. The fluorogenic group undergoes a parameter change in its optical properties when reacting with H2O2, allowing differentiation between H2O2 presence and other ROS. This parameter change enables the probe to distinguish H2O2-specific signals from background fluorescence.
2Measurement precision
If probes with external activating enzymes are used, then H2O2 detection sensitivity is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The probe performs self-activation through chemoselective reaction with H2O2 without requiring external enzymes or activating agents. The fluorogenic group is designed to be activated directly by H2O2 itself, eliminating the need for separate enzymatic systems. This self-service mechanism reduces device complexity while maintaining high detection sensitivity.
Solution Approach 2:
The invention extracts and eliminates the external activating enzyme component from the probe system. By designing the probe to be directly activated by H2O2 through chemoselective reaction, the complex enzymatic activation step is removed, simplifying the overall system while preserving detection capability.
3Illumination intensity
If UV-excited fluorescent probes are used, then fluorescence signal is obtained, but photodamage and autofluorescence occur in biological systems
Solution Approach 1:
The probe is designed with absorption and emission spectra shifted to visible regions, changing the excitation parameter from UV to visible light. This parameter change in the optical spectrum allows obtaining fluorescence signals while avoiding UV-induced photodamage and autofluorescence in biological systems.
Solution Approach 2:
The probe utilizes visible light excitation and emission (color/visible region) instead of UV excitation. This color change in the optical spectrum enables fluorescence detection while minimizing harmful effects such as photodamage and autofluorescence that are associated with UV light in biological applications.
4Adaptability or versatility
If probes lacking water solubility are used, then organic compatibility is improved, but water solubility and biological compatibility deteriorate
Solution Approach 1:
The probe structure incorporates modifications that change its solubility parameter to be water-soluble while maintaining organic compatibility. This parameter change in molecular properties allows the probe to function effectively in aqueous biological environments without sacrificing its ability to interact with organic substrates or cells.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The probes provide excellent selectivity for H2O2 over competing ROS, enabling effective imaging of H2O2 concentrations in living cells with reduced photodamage and autofluorescence, facilitating better understanding of H2O2 roles in physiology and pathology.
Implementation Method 1
The compounds of the invention emit light or, alternatively, they can be used to absorb light emitted by a reporter fluorophore
Implementation Method 2
conversion of a pro-fluorescent species into a fluorescent probe by chemoselective deprotection of the pro-fluorescent species
Implementation Method 3
The compounds of the invention are selective and sensitive chemosensors for H2O2 with properties amenable to biological imaging applications
Data Source
AI summary
The present invention provides a novel class of pro-fluorescent probes for reactive oxygen species (ROS). One exemplary probe is mitochondria peroxy yellow 1 (MitoPY1), a new type of flurophore for imaging mitochondrial H2O2 in living cells with ROS and spatial specificity. The invention also provides methods of using pro-fluorescent probes to detect analytes. One exemplary method comprises using a pro-fluorescent probe of the invention to detect an explosive.