06/04/2026
One of the most important findings in this new osteoporosis research is this:
Bone is not passive structure.
Bone is a mechanosensory organ.
Researchers identified a receptor called GPR133 that appears to help bones stay strong by:
• stimulating osteoblasts (bone-building cells)
• restraining osteoclasts (bone-resorbing cells)
• responding directly to mechanical strain and cell-to-cell contact. The researchers were even able to significantly improve bone strength in osteoporotic mice by activating this receptor with a compound called AP503.
Why should manual therapists care?
Because this reinforces one of the most important principles in rehabilitation and osteopathic thinking:
Movement is biologic signaling.
Bone constantly interprets:
• force
• tension
• compression
• shear
• vibration
• loading variability
And then adapts accordingly.
The article specifically noted that GPR133 becomes activated by mechanical strain.
That should immediately make manual therapists think about:
• mechanotransduction
• Wolff’s Law
• Piezo signaling
• load variability
• fascial force transmission
• muscle-bone interaction
• movement-driven remodeling
Because clinically, patients with osteoporosis or osteopenia often present with:
• rigid thoraxes
• shallow breathing
• poor gait variability
• deconditioning
• reduced loading tolerance
• fear-based movement
• balance deficits
• decreased proprioceptive adaptability
Actionable considerations for manual therapists:
1️⃣ Respect bone as living adaptive tissue
Bone remodels continuously in response to mechanical input.
2️⃣ Use graded loading strategically
The goal is not simply “exercise.”
The goal is adaptive mechanosensory signaling.
3️⃣ Improve diaphragmatic and thoracic mechanics
Rib motion and pressure variability influence:
• posture
• balance
• gait
• force transfer
• loading distribution
4️⃣ Restore movement variability
Bone responds better to varied loading than monotonous loading.
5️⃣ Focus on force transmission through the entire kinetic chain
Poor hip, thoracic, or foot mechanics may alter how force reaches bone tissue.
6️⃣ Think beyond calcium alone
Bone health also depends on:
• movement
• vascularity
• autonomic balance
• muscle signaling
• hormonal environment
• mitochondrial health
One fascinating implication of this study is that:
the body already contains built-in “bone strengthening switches”…
…and those switches appear highly responsive to mechanical forces.
That is a profound systems-biology concept.
The future of rehabilitation may increasingly recognize that:
mechanics influence cellular signaling,
cellular signaling influences tissue remodeling,
and movement may be one of the most powerful anabolic signals in human physiology.
A little-known receptor may reshape how scientists approach bone loss.