Stem Cells and Calcium Signals Linked to Ligament Thickening in Lumbar Spinal Stenosis
Scientists identified stem cells that produce tendons and ligaments and found them unusually active in spinal ligaments affected by lumbar spinal stenosis. In mouse experiments, blocking calcium signaling reduced the tissue overgrowth. The work suggests a possible nonsurgical treatment target for a condition that affects an estimated 103 million people worldwide.
Lumbar spinal stenosis occurs when the lower-back spinal canal narrows and presses on nerves, leading to pain, numbness, weakness, and walking problems; it becomes more common with age and affects an estimated 103 million people globally. Researchers compared ligament samples from stenosis patients with samples from people who had herniated discs but no stenosis.
The stenosis ligaments held more of these stem cells, and transplanted cells made more tendon cells in mice. The team linked the overactivity to calcium signaling; increasing it caused tissue overgrowth, while reducing it blocked overgrowth in a mouse model. The study appeared in Cell.
If calcium-signaling drugs can be repurposed, people with lumbar spinal stenosis—especially older adults—might gain a nonsurgical option that could delay or reduce need for surgery. This may lessen pain, mobility limits, and care burden. However, benefits remain uncertain until clinical trials confirm safety and effectiveness in humans. Access and cost could shape real-world reach.