Glutathione Assay
Glutathione Assay - Related Videos
09:22
The Cell-based L-Glutathione Protection Assays to Study Endocytosis and Recycling of Plasma Membrane Proteins
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Cited by 17 •
2013
Membrane trafficking involves transport of proteins from the plasma membrane to the cell interior (i.e. endocytosis) followed by trafficking to lysosomes for degradation or to the plasma membrane for recycling. Methods described in this article are designed to study endocytosis and recycling of plasma membrane proteins.
08:10
Measuring Glutathione-induced Feeding Response in Hydra
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Cited by 9 •
2014
Here we describe a simple assay for the quantification of the feeding response in hydra induced by the reduced form of glutathione. This assay relies on measuring the distance between the apical end of the tentacle and mouth of hydra.
01:22
Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation
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2025
Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion. Several distinctive characteristics distinguish glutathione conjugation from other phase II...
14:57
Spectrophotometric Screening for Potential Inhibitors of Cytosolic Glutathione S-Transferases
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Cited by 14 •
2020
Glutathione S-transferases (GSTs) are detoxification enzymes involved in the metabolism of numerous chemotherapeutic drugs. Overexpression of GSTs is correlated with cancer chemotherapy resistance. One way to counter this phenotype is to use inhibitors. This protocol describes a method using a spectrophotometric assay to screen for potential GST inhibitors.
04:14
Msp1 Extraction Assay to Study the Removal of Mislocalized TA Proteins
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2025
This video demonstrates an in vitro protocol to study the Msp1-mediated removal of mislocalized TA proteins integrated into the lipid bilayer of liposomes. Msp1 and TA proteins are co-reconstituted into liposomes, and the ATP-dependent translocation of TA proteins is confirmed through affinity purification.
FAQs
The GSH-to-GSSG ratio helps indicate cellular redox balance by comparing reduced glutathione with its oxidized form. A measured shift in this ratio can reflect altered oxidative conditions, but sample oxidation may change the result after collection. Careful handling is therefore essential so that the reported relationship represents the biological sample rather than processing-related oxidation.
Glutathione reductase converts oxidized glutathione, or GSSG, back to reduced glutathione, or GSH. In an NADPH-dependent recycling reaction, this conversion supports production of a measurable signal and can improve assessment of glutathione content. The enzyme therefore links the chemical conversion of GSSG with quantitative detection in the assay.
GSH measurement focuses on the reduced form, whereas GSSG measurement focuses on the oxidized form. Total glutathione provides a combined view of glutathione content rather than separating the redox states. Selecting among these readouts depends on whether the investigation emphasizes antioxidant capacity, oxidation status, or overall glutathione availability.
DTNB acts as a chromogenic reagent, meaning that its reaction with the thiol group of GSH produces a measurable signal. An NADPH-dependent format instead uses glutathione reductase to recycle GSSG into GSH while generating a signal through the reaction system. These approaches measure glutathione through related but distinct detection chemistries.
Oxidation during sample handling can convert reduced glutathione into oxidized glutathione and alter the measured GSH-to-GSSG ratio. This issue is especially important when the goal is to evaluate redox balance rather than total glutathione alone. Consistent, careful handling helps preserve the original relationship between glutathione forms and supports more reliable interpretation.
In medicine, glutathione assays can support evaluation of oxidative stress, antioxidant capacity, liver function, toxicant exposure, and responses to pharmacological treatment. The selected measurement may emphasize reduced glutathione, oxidized glutathione, or total glutathione, allowing investigators to relate glutathione status to a specific clinical or treatment-related question.