Integrin
Also called: integrins
What it means
Integrins are proteins that anchor bone cell extensions to their surrounding canal, letting cells sense mechanical force and turn it into a chemical signal.
Integrins are part of how your bone cells detect movement, which is the starting point for your skeleton's natural sense-and-respond system.
Integrins are tiny proteins that sit on the surface of osteocyte dendrites, the thin arm-like extensions of your bone cells. They act like anchors, attaching the dendrite firmly to the wall of the tiny canal it sits in. When you move and fluid shifts through these canals, the dendrite tries to bend, and the integrins hold on and resist that movement.
That resistance is actually the point. By gripping tight, integrins transmit the physical force straight into the cell's internal skeleton, called the cytoskeleton. This is how a simple mechanical push gets turned into a chemical signal the cell can understand and respond to.
This handoff from physical force to chemical signal is considered the very first step of mechanotransduction, the process your bone cells use to sense movement and loading. Understanding integrins helps explain how your skeleton has a built-in way of detecting activity at the cellular level.
How sure is this?
Graded Established Science: Supported by broad scientific consensus and decades of research. Read each study with its grade in mind. One study is a piece of the picture, not the whole of it.
Where the Academy teaches it
This page is the short version. The lessons teach it in full, with the context around it and a quiz to lock it in.
Related words
Osteocytes are the most common bone cells. They used to be bone-builders but got trapped inside bone tissue, where…
Mechanotransduction is how bone cells sense physical force and turn it into chemical signals that tell bone to adapt.
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Interstitial fluid flow is the movement of fluid through tiny channels in bone that happens when bone bends,…
Piezo1 is a stretch-sensitive channel in bone cell membranes that opens when fluid moves through bone, letting ions…
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