A nomenclature system for the isoprostanes

Area of Science:

• Biochemistry
• Free radical chemistry
• Lipid peroxidation

Background:

• Prostaglandin (PG) F2-like compounds were identified in 1990, produced via a free radical mechanism independent of cyclooxygenase.
• These compounds, termed F2-isoprostanes (F2-IsoPs), are isomeric to PGF2 alpha.
• Later, D2-IsoPs and E2-IsoPs were also found to be produced in vivo through this pathway.

Purpose of the Study:

• To address the need for a systematic nomenclature for isoprostanes (IsoPs).
• To enable rational differentiation and designation of the numerous isomeric structures within the IsoP family.
• To facilitate research into IsoPs as biomarkers of lipid peroxidation and their biological activities.

Main Methods:

• Identification of prostaglandin (PG)-like compounds produced by free radical mechanisms.
• Characterization of isomeric and diastereomeric forms of F2-IsoPs, D2-IsoPs, and E2-IsoPs.
• Development of a systematic nomenclature system for the diverse IsoP structures.

Main Results:

• Discovery of F2-IsoPs, D2-IsoPs, and E2-IsoPs formed via non-enzymatic free radical pathways.
• Identification of four regioisomers for each class, with eight racemic diastereomers each, totaling 64 distinct IsoPs.
• Establishment of a nomenclature system for differentiating and designating IsoP isomers.

Conclusions:

• Isoprostanes (IsoPs) are valuable biomarkers for assessing in vivo free radical-induced lipid peroxidation.
• IsoPs possess potent biological activities, driving interest in their synthesis and study.
• A systematic nomenclature is crucial for the clear communication and advancement of IsoP research.