Mechanical Suppression of Sonic Hedgehog Signaling by Nucleus Pulposus Cells Underlies Early Disc Degeneration in Mouse
Sonic hedgehog (SHH) expression by nucleus pulposus (NP) cells is important for intervertebral disc development and maintenance. The lumbosacral disc, the most immobile region of the spine, lies adjacent to the sacrum and is most vulnerable to degeneration. We hypothesized that a lack of mobility represses SHH expressi...