Experiments in mice and cultured cells traced a protein exchange between cells supporting retinal vessels and the cells lining them. Oxygen-starved support cells released vesicles carrying hexokinase 2, promoting abnormal vessel growth through a pathway beyond its familiar metabolic role. Disabling the protein reduced unwanted growth but also expanded vessel-free areas, complicating the prospect of a selective treatment.
Pericytes, cells that support blood vessels, released tiny vesicles carrying the protein hexokinase 2 when oxygen was scarce. Cells lining retinal vessels received that cargo. A peer-reviewed Experimental & Molecular Medicine study published on 5 November links this exchange to abnormal vessel growth in cultured cells and mice. The protein’s role extended beyond the glucose-processing activity with which it is usually associated.[1]
Researchers altered oxygen conditions during mouse retinal development. Disabling the protein in pericytes reduced abnormal vascular tufts, while areas lacking vessels grew larger. Adding protein-containing vesicles reversed some changes. Vesicle-release suppression experiments showed changes in a similar direction. Together, these interventions supported a transfer mechanism while revealing a trade-off between limiting pathological growth and preserving vessel development.[1]
The molecular pathway affected growth, movement and sprouting of vessel-lining cells. Its proposed protein interaction has mutation evidence but lacks high-resolution structural confirmation. Compounds used to inhibit vesicles can affect other cellular processes. These model limitations and effects on normal vessel growth leave human treatment safety and effectiveness unresolved; the findings identify a research pathway rather than a tested patient therapy.[1]
