7-ketocholesterol / oxysterols accumulated in macrophage-derived foam

Class

Small-molecule dimerized cyclodextrin (lipid/oxysterol-extraction agent)

Pathway

Extracts 7-ketocholesterol and other oxysterols from macrophage-derived foam cells, reversing foam cell formation and promoting atherosclerotic plaque regression

Notes

original target text: 7-ketocholesterol / oxysterols accumulated in macrophage-derived foam cells

Atherosclerotic plaques form when macrophages engulf oxidized low-density lipoprotein and accumulate cholesterol and its oxidized derivatives, called oxysterols, inside their cytoplasm. One particularly reactive oxysterol, 7-ketocholesterol, is cytotoxic, pro-inflammatory, and resistant to normal cellular clearance mechanisms. Macrophages laden with these lipids take on a distinctive fat-filled appearance and are termed foam cells; they populate the lipid-rich core of atherosclerotic plaques and contribute to plaque growth, inflammation, and instability. Rather than blocking a receptor or enzyme, this mechanism works by physically extracting 7-ketocholesterol and related oxysterols from within foam cells, using a cyclodextrin, a ring-shaped sugar molecule with a hydrophobic interior capable of capturing lipid molecules and carrying them into aqueous solution. Linking two cyclodextrin units together (dimerization) increases the molecule's capacity and affinity for these lipid cargoes compared with a single ring, allowing more efficient removal of the toxic oxysterol burden. By clearing this material, the intervention aims to reverse the transformation of macrophages into foam cells and support regression of existing plaque rather than merely slowing its progression. This approach is broadly relevant to atherosclerotic cardiovascular disease, where plaque burden and composition, not only cholesterol levels in blood, determine risk of rupture and downstream events such as heart attack or stroke.