You searched for: “podosomes
podosomes
Immune cells that perambulate or "sprint" to infection sites in the body to ward off invading pathogens.

These microscopic assemblies seem to form "feet" on the bottom surface of the leading edge of migrating cells which indicate a location consistent with the idea that they help cells move.

Cell biologists have discovered structures on a variety of migratory cells, including immune cells called macrophages and osteoclasts which help maintain bone by dissolving away areas that need repair. In all cases, the structures appear when the cells make contact with a surface. This suggests that they might be involved in cell adhesion, and thus in cell motility, because cells have to stick to the surface over which they are migrating in order to move.

—"Podosomes and Invadopodia Help Mobile Cells Step Lively" by Jean Marx; Science, June 30, 2006; pages 1868-1869.