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Oxidized lipids—fats structurally altered by enzymes, oxygen or free radicals—are double-edged swords that can both quell and ignite systemic inflammation, according to a new comprehensive review aimed at sharpening the overall understanding of an intricate class of highly reactive molecules.
Dr. Marco Di Gioia and Dr. Ivan Zanoni, two medical investigators from the divisions of immunology and gastroenterology at Harvard Medical School, explored this complex molecular universe by focusing on a class of compounds called oxidized phospholipids—oxPLs.
In their article published in Science Immunology, they explored why sharp differences in oxPL activity can have favorable or unfavorable biological outcomes. OxPLs, the authors emphasized, exemplify how a compound can possess one of two distinct sides. They explained how these molecules can act either as benign agents or ones capable of substantial harm.
The unfavorable side of oxPLs is especially noteworthy, the authors added, because of the roles these molecules play in an array of disease processes.
Oxidized lipids form when cellular fats interact with oxygen, altering the lipids' chemical structure and turning these compounds into molecules that can either trigger or modulate inflammation. While oxPLs arise spontaneously from routine cellular stress, the authors report that these molecules can quickly evolve into highly reactive, biologically active compounds. Chemically, they can be generated when, for example, a cell membrane undergoes oxidative stress.
"Spontaneously generated oxidized lipids, including nonenzymatically oxidized phospholipids, result from oxidative stress and accumulate during inflammation, affecting cellular metabolism, immune cell functions and cell fate," write Di Gioia and Zanoni, whose deep dive into this complex molecular universe was undertaken to highlight the importance of these molecules in human health and disease.
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