How Immune Cells Team Up to Build Pro-Resolving Omega-3 and Omega-6 Compounds

This laboratory study looked at how different immune cell types work together to produce specialized molecules called “pro-resolving mediators” — compounds made from omega-3 and omega-6 fatty acids that are involved in calming down inflammation. These molecules are built through a two-step process using enzymes called lipoxygenases (LOX), and scientists wanted to understand which cell combinations and enzyme types drive this process most effectively.

Researchers combined human white blood cells (neutrophils or monocytes) with platelets or with two types of macrophages (immune cells that carry different LOX enzyme variants: 15-LOX-1 or 15-LOX-2). Using advanced mass spectrometry to track fatty acid metabolites, they found that pairing neutrophils with 15-LOX-2-rich macrophages produced strong amounts of two resolvins (RvD5 and RvE4), while 15-LOX-1-rich macrophages alone made resolvins efficiently but produced less when combined with neutrophils.

The study also found that the two versions of the 15-LOX enzyme have different fatty acid preferences: 15-LOX-1 works best with arachidonic acid and EPA, while 15-LOX-2 favors DHA. This suggests the first oxidation step by the 5-LOX enzyme is a key limiting factor in how these resolving compounds are ultimately formed.