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Novel n-3 immunoresolvents: structures and actions
Jesmond Dalli1, Romain A Colas, Charles N Serhan
1Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Harvard Institutes of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.
Endogenous n-3 docosapentaenoic acid (DPA) is converted into novel specialized pro-resolving mediators (SPMs) during inflammation resolution. These n-3 DPA-SPMs exhibit potent anti-inflammatory and protective actions, comparable to known resolvins.
Area of Science:
- Lipid mediators
- Inflammation resolution
- Biochemistry
Background:
- Inflammation resolution is an active, autacoid-driven process essential for restoring homeostasis.
- Endogenous omega-3 fatty acids are precursors to potent bioactive lipid mediators.
Purpose of the Study:
- To investigate the conversion of endogenous n-3 docosapentaenoic acid (DPA) into specialized pro-resolving mediators (SPMs) during inflammation resolution.
- To characterize the structures and bioactions of novel n-3 DPA-derived SPMs.
Main Methods:
- Functional-metabololipidomics and in vivo systems were employed.
- Analysis of lipid mediators in mouse models and human leukocytes during inflammation resolution.
Main Results:
- Novel n-3 DPA-derived SPMs, including RvD1(n-3 DPA) and MaR1(n-3 DPA), were identified.
- These n-3 DPA-SPMs demonstrated protective effects against organ injury and reduced systemic inflammation in ischemia-reperfusion models.
- In human leukocytes, n-3 DPA-SPMs inhibited neutrophil chemotaxis and adhesion while enhancing macrophage phagocytosis.
Conclusions:
- Endogenous n-3 DPA serves as a precursor to novel SPM structures with potent immunoresolvent properties.
- These newly identified n-3 DPA-SPMs possess bioactions comparable to established resolvins, protectins, and maresins.
- The findings suggest that these novel SPMs are produced in humans when n-3 DPA levels are elevated, highlighting their potential therapeutic significance.
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