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[Xenobiotics and glutathione]
1Dipartimento di Medicina Interna e Medicina Pubblica, Università di Bari. l.soleo@medlav.uniba.it
Giornale Italiano Di Medicina Del Lavoro Ed Ergonomia
|April 20, 2000
Summary
Mercapturic acids (MA) are the end product of detoxification pathways involving glutathione (GSH). Their formation in humans highlights their importance for monitoring exposure to harmful electrophiles.
Area of Science:
- Biochemistry
- Toxicology
- Metabolism
Context:
- Glutathione (GSH) conjugation detoxifies electrophiles, preventing DNA and protein damage.
- Genetic polymorphism in GSH-S-transferases (GSTs) influences individual susceptibility to xenobiotics.
- Mercapturic acids (MA) are the terminal metabolites of this detoxification pathway.
Purpose:
- To elucidate the metabolic pathway of mercapturic acids (MA).
- To highlight the role of GSH conjugation and GSTs in detoxification.
- To emphasize the utility of MA as biomarkers of electrophilic exposure.
Summary:
- Electrophiles conjugate with glutathione (GSH), forming conjugates metabolized to mercapturic acids (MA).
- This process, involving enzymes like GSH-S-transferases (GSTs), is genetically polymorphic.
- MA formation occurs in humans, indicating their value in biological monitoring for occupational and environmental exposure.
Impact:
- MA serve as crucial internal dose indicators for electrophilic exposure.
- Understanding MA metabolism aids in assessing individual risk from toxic compounds.
- This pathway is vital for preventing mutagenic and carcinogenic effects of xenobiotics.