Glutathione S-transferases (GSTs) are a superfamily of phase II detoxification enzymes that catalyze the conjugation of reduced glutathione (GSH) to a wide range of hydrophobic and electrophilic substrates. This conjugation enhances solubility and facilitates excretion of potentially harmful compounds such as carcinogens, drugs, and products of oxidative stress. GSTs are expressed in multiple isoforms, including cytosolic and microsomal classes, and are found in diverse tissues and organisms. Measuring GST activity provides valuable insights into cellular detoxification capacity, oxidative stress responses, and the impact of environmental toxins or pharmaceuticals.
Applications
- Detoxification and Xenobiotic Metabolism: Assessing GST activity to study cellular defense against drugs, carcinogens, and environmental toxins.
- Oxidative Stress Research: Evaluating GST role in neutralizing products of oxidative damage.
- Disease Biomarker Studies: Investigating altered GST activity in cancer, liver diseases, neurodegeneration, and other pathologies.
- Pharmacological Screening: Screening compounds for modulation of GST activity.
- Tissue and Cell Biology: Measuring GST activity in various tissues, plasma, erythrocytes, and cultured cells.
Advantages
- Sensitivity and Specificity: CDNB substrate reacts with a broad range of GST isoforms, providing a measure of total GST activity.
- High-Throughput Compatibility: Kits are optimized for 96-well plate formats, enabling rapid processing of multiple samples.
- Sample Versatility: Compatible with cell lysates, tissue homogenates, plasma, and erythrocyte lysates.
- Ease of Use: Simple reaction setup with readily available reagents and standard spectrophotometric detection.
Glutathione S-transferase assay kits based on the CDNB conjugation reaction provide robust, sensitive, and user-friendly tools for measuring total GST activity in diverse biological samples. Their adaptability to high-throughput formats and compatibility with standard laboratory equipment make them indispensable in detoxification research, oxidative stress studies, and pharmacological screening. Selection of an appropriate assay kit depends on sample type, required throughput, and analytical specificity.
