NAD(P)H Assay Compounds for Direct Cellular Redox Measurement
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Solution Overview
Problem
Current methods for assessing the redox state of metabolically active cells are limited by low sensitivity and require labor-intensive nucleotide extraction and enzymatic cycling reactions, with unclear mechanisms of action and specificity for cellular enzymes.
Innovation Solution
Development of compounds according to Formulas (I) to (V) that allow for direct measurement of NAD(P)/NAD(P)H levels and ratios in cellular samples, enabling detection of enzyme activity and metabolite levels, and assessment of cell toxicity and viability through bioluminescence or fluorescence signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tetrazolium salts (MTT, MTS, and XTT) or resazurin are used to assess redox state, then a colorimetric or fluorescent signal is produced, but the sensitivity is low and labor-intensive extraction methods are required
Solution Approach 1:
The patent extracts and utilizes endogenous NAD(P)H directly from cells without requiring labor-intensive nucleotide extraction methods. The NAD(P)H itself serves as the reducing agent that generates the signal, eliminating the need for separate extraction and enzymatic cycling steps while maintaining high sensitivity through direct detection of cellular NAD(P)H levels
Solution Approach 2:
The assay utilizes the universal cellular co-factor NAD(P)H that performs multiple functions: it serves as both the metabolic indicator of redox state and the reducing agent that generates the detectable signal. This multi-functionality eliminates the need for separate extraction procedures and enzymatic cycling reactions required by traditional tetrazolium salt methods
2Measurement precision
If enzymatic cycling reactions are used to amplify the signal, then detection sensitivity is improved, but the procedure becomes more complex and time-consuming
Solution Approach 1:
The assay allows endogenous NAD(P)H to serve itself as the signal source. The cellular NAD(P)H directly reduces the tetrazolium salt or resazurin without requiring external enzymatic cycling reactions for signal amplification. This self-service mechanism simplifies the procedure while maintaining sensitivity by directly measuring the cellular reducing power
3Reliability
If traditional redox assay compounds are used, then redox state can be assessed, but the mechanism of action is unclear and specificity for cellular enzymes is unknown
Solution Approach 1:
The patent uses NAD(P)H as an intermediary that connects cellular metabolism to the detectable signal. By measuring endogenous NAD(P)H levels directly through their reducing activity on tetrazolium salts or resazurin, the assay provides both reliable redox state assessment and clear mechanistic information about cellular metabolic status without requiring unknown enzymatic pathways
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
These compounds provide a sensitive and efficient means to analyze the redox state of cells, enzyme activity, and metabolite levels without the need for extensive extraction or cycling reactions, offering a direct and proportional measurement of cellular redox status and viability.
Implementation Method 1
The redox state of a cell is described as the balance between the oxidized form of these nucleotides (NAD(P)) and the reduced form (NAD(P)H). During cellular energy metabolism, energy is often stored and released as part of redox reactions.
Implementation Method 2
enabling detection of enzyme activity and metabolite levels, and assessment of cell toxicity and viability through bioluminescence or fluorescence signals
Implementation Method 3
enabling detection of enzyme activity and metabolite levels, and assessment of cell toxicity and viability through bioluminescence or fluorescence signals
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
The present invention provides compounds and methods for assaying redox state of metabolically active cells and methods for assaying enzyme activity and/or metabolite level by coupling to redox defining co-factor NAD(P)/NAD(P)H measurement.