Review Article
Focal Adhesion Kinases in Adhesion Structures and Disease
Table 1
Common and unique features of focal adhesions, podosomes, and invadopodia. See text for details.
| | Focal adhesion | Podosomes | Invadopodia |
| Appearance | dense plaques of F-actin | F-actin bundle core surrounded by actin cloud | F-actin bundle core surrounded by actin cloud |
| Size | width: 2–6 μm | width: 0.5–2 μm length: 0.5–2 μm | width: 0.5–2 μm length: >2 μm |
| Duration (half-life) | hours | minutes | hours |
| Cell expression | numerous nonmigrating fibroblastic cells | monocytic cells osteoclasts endothelial cells smooth muscle cells Src-transformed fibroblasts | carcinoma cells Src-transformed fibroblasts |
| Location | often found at leading edge of cell | ventral side of the cellular membrane | ventral side of the cellular membrane |
| Extracellular matrix degradation | no | yes | yes |
| Common signaling molecules | focal adhesion proteins GTPases actin regulators motor proteins tyrosine kinases phosphatases scaffolding molecules | focal adhesion proteins GTPases actin regulators motor proteins tyrosine kinases phosphatases scaffolding molecules | focal adhesion proteins GTPases actin regulators motor proteins tyrosine kinases phosphatases scaffolding molecules |
| Distinct Features | integrin receptors | Integrin receptors matrix-degrading enzymes | matrix-degrading enzymes |
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