Early recruitment of membrane-bound DNaseX to phagocytic cups in macrophages.

Membrane-bound DNaseX is recruited early to macrophage phagocytic cups, exhibiting rapid DNase activity before phagosome internalization.

• Why it matters: Understanding how macrophages degrade extracellular DNA is crucial for insights into immune defense and biofilm clearance, addressing gaps in knowledge about early DNA degradation mechanisms.
• What they did: Researchers used a fluorescent DNase sensor to observe DNase activity during phagocytic cup formation across various macrophage types and identified DNaseX as the responsible enzyme, with activity correlating with F-actin polymerization.
• The result: The study demonstrates that macrophages can degrade extracellular DNA directly at the membrane, enabling clearance of bulky eDNA structures without internalization, revealing a novel DNA degradation pathway.