Wnt signaling pathway
Also called: Wnt pathway, wnt/beta-catenin signaling, Wnt signalling
What it means
The Wnt signaling pathway is a cell-communication system that signals osteoblasts to build new bone; when it's blocked, bone formation slows or stops.
This pathway controls whether your bone-building cells are switched on or off, directly affecting how much new bone you make.
The Wnt signaling pathway is a chemical messaging system that tells bone-building cells, called osteoblasts, to switch on and get to work. When Wnt signals reach the surface of an osteoblast, they bind to receptors called LRP5 and LRP6, which activates a protein called beta-catenin inside the cell. This process pushes young bone cells to mature and start laying down new bone matrix.
The pathway can also be shut off. Molecules like sclerostin and DKK1 block the Wnt signal from reaching its receptors, essentially putting the brakes on bone formation. Your body normally balances these 'on' and 'off' signals to keep bone remodeling steady, but disease and inactivity can tip that balance.
In multiple myeloma, cancer cells release DKK1 and sclerostin in excess, silencing the Wnt pathway and stopping osteoblasts from rebuilding bone, while other signals ramp up osteoclast activity to break bone down. This mismatch causes bone to be destroyed without being replaced, leading to the lytic lesions seen in this disease. Understanding this pathway is also why some osteoporosis medications are designed to block sclerostin, though any treatment decisions belong to your doctor.
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.
The Wnt pathway acts like a switch controlling whether your bone-building cells turn on or off.
Where this leads
WordWondering who actually does the building once the switch flips on? Meet the cells responsible for laying down new bone throughout life.
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
An osteoblast is a cell that builds new bone by laying down fresh bone matrix, working alongside cells that break…
Beta-catenin is a protein inside bone-building cells that acts as a key messenger in the Wnt signaling pathway,…
LRP5 and LRP6 are receptors on bone cells that work with the Wnt signaling pathway to control how much new bone your…
Dickkopf-1 (DKK1) is a protein that blocks bone-building signals, and it's made in excess by some diseases like…
Sclerostin is a protein made by bone cells called osteocytes that blocks new bone formation; less mechanical strain…
Multiple myeloma is a cancer of plasma cells in the bone marrow that disrupts the normal bone rebuilding process,…
Education only, not medical advice. Decisions about tests, medications and treatment belong with your own doctor. OsteoStrong does not diagnose, treat or cure any disease.
