Synthesis, Structural Confirmation, and Biosynthesis of 22-OH-PD1<sub>n-3 DPA</sub>
Jannicke Irina Nesman,
Karoline Gangestad Primdahl,
Jørn Eivind Tungen,
Fransesco Palmas,
Jesmond Dalli,
Trond Vidar Hansen
Affiliations
Jannicke Irina Nesman
Department of Pharmacy, Section of Pharmaceutical Chemistry, University of Oslo, P.O. Box 1068 Blindern, N-0316 Oslo, Norway
Karoline Gangestad Primdahl
Department of Pharmacy, Section of Pharmaceutical Chemistry, University of Oslo, P.O. Box 1068 Blindern, N-0316 Oslo, Norway
Jørn Eivind Tungen
Department of Pharmacy, Section of Pharmaceutical Chemistry, University of Oslo, P.O. Box 1068 Blindern, N-0316 Oslo, Norway
Fransesco Palmas
Lipid Mediator Unit, William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK
Jesmond Dalli
Lipid Mediator Unit, William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK
Trond Vidar Hansen
Department of Pharmacy, Section of Pharmaceutical Chemistry, University of Oslo, P.O. Box 1068 Blindern, N-0316 Oslo, Norway
PD1n-3 DPA belongs to the protectin family of specialized pro-resolving lipid mediators. The protectins are endogenously formed mediators that display potent anti-inflammatory properties and pro-resolving bioactivities and have attracted interest in drug discovery. However, few studies have been reported of the secondary metabolism of the protectins. To investigate the metabolic formation of the putative C22 mono-hydroxylated product, coined 22-OH-PD1n-3 DPA, a stereoselective synthesis was performed. LC/MS-MS data of synthetic 22-OH-PD1n-3 DPA matched the data for the biosynthetic formed product. Cellular studies revealed that 22-OH-PD1n-3 DPA is formed from n-3 docosapentaenoic acid in human serum, and we confirmed that 22-OH-PD1n-3 DPA is a secondary metabolite produced by ω-oxidation of PD1n-3 DPA in human neutrophils and in human monocytes. The results reported are of interest for enabling future structure−activity relationship studies and provide useful molecular insight of the metabolism of the protectin class of specialized pro-resolving mediators.
