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Methyl 5-MeO-N-aminoanthranilate, a minimalist fluorogenic probe for sensing cellular aldehydic load
Mojmír Suchý1, Caitlin Lazurko, Alexia Kirby
1Department of Chemistry & Biomolecular Scences, University of Ottawa, Ottawa, ON, Canada. ashuhend@uottawa.ca.
Organic & Biomolecular Chemistry
|November 20, 2018
Summary
Methyl 5-MeO-N-aminoanthranilate detects cellular aldehydes, key markers of oxidative stress, using fluorescence microscopy. This minimalist probe offers a new method for assessing "aldehydic load" in cells.
Area of Science:
- Analytical Chemistry
- Cell Biology
- Biochemistry
Background:
- Endogenous carbonyls, such as aldehydes, are critical biomarkers of cellular oxidative stress.
- Lipid peroxidation generates aldehydes that damage cell membranes and contribute to disease.
- Accurate detection of these aldehydes is essential for understanding cellular health and disease progression.
Purpose of the Study:
- To develop and evaluate methyl 5-MeO-N-aminoanthranilate as a novel fluorogenic probe for detecting endogenous aldehydes.
- To assess the probe's capability in monitoring cellular oxidative stress under physiological conditions.
- To characterize the reaction products and functional limitations of the probe.
Main Methods:
- Synthesis and characterization of methyl 5-MeO-N-aminoanthranilate.
- Study of the probe's reaction with various aldehydes, including malondialdehyde and long-chain aliphatic aldehydes.
- Application of the probe for live cell imaging of oxidative stress induced by diethyl maleate.
- Evaluation of the probe's performance with and without α-tocopherol pretreatment.
Main Results:
- Methyl 5-MeO-N-aminoanthranilate enables rapid, catalyst-free complexation with aldehydes.
- The probe successfully detected aldehydic products of lipid peroxidation.
- Live cell imaging demonstrated the probe's ability to visualize diethyl maleate-induced oxidative stress.
- Intramolecular cyclization was identified as a functional constraint of the probe.
Conclusions:
- Methyl 5-MeO-N-aminoanthranilate serves as a minimalist molecular probe for detecting cellular "aldehydic load" via fluorescence microscopy.
- The probe provides a valuable tool for assessing oxidative stress and lipid peroxidation in biological systems.
- Understanding the probe's limitations is crucial for accurate interpretation of fluorescence-based aldehyde detection results.
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