A bioprinted scaffold containing nerve cells and piezoelectric material responds to ultrasound by triggering CGRP peptide release, which accelerated bone regeneration with blood vessel and nerve growth in rats.
On-Demand CGRP ReleaseUltrasound-stimulated piezoelectric scaffold triggers nerve cells to secrete bone-healing CGRP peptide, creating a self-contained sensor-effector circuit for bone regeneration
What the researchers found
Researchers engineered a self-contained sensor-effector circuit by bioprinting dorsal root ganglion (DRG) neurons within piezoelectric poly(L-lactide) (PLLA) scaffolds. Upon ultrasound stimulation, the piezoelectric material generated electrical signals that triggered calcium influx in the DRG neurons, enhancing secretion and expression of calcitonin gene-related peptide (CGRP). The released CGRP promoted both osteogenesis and angiogenesis in vitro, and accelerated neuro-vascularized bone regeneration in a rat femoral condyle defect model — demonstrating a bioinspired platform that autonomously links mechanical sensing to peptide-driven bone repair.
Why it matters
Current bone scaffolds are passive structures that don't replicate the body's natural nerve-driven healing signals. By creating a scaffold that actively produces CGRP peptide in response to ultrasound, this approach bridges the gap between bioengineering and the body's own bone repair mechanisms — potentially leading to faster, more complete bone healing with proper nerve and blood vessel integration.
How the study worked
The researchers used neural bioprinting to embed dorsal root ganglion neurons within piezoelectric PLLA scaffolds. They applied ultrasound stimulation to trigger mechanoelectrical coupling, measuring calcium influx and CGRP secretion. In vitro experiments assessed osteogenesis and angiogenesis. In vivo testing used a rat femoral condyle defect model to evaluate bone regeneration, vascularization, and nerve integration.
What this study cannot tell us
This is an animal study using a rat femoral condyle defect model, which does not fully replicate human bone healing. The approach requires external ultrasound stimulation, adding complexity to clinical application. Long-term durability and safety of the bioprinted neural scaffolds in larger animals or humans remain untested. CGRP also plays roles in pain signaling, which could have unintended effects.
How to read the evidence
This is an innovative preclinical study with both in vitro and in vivo (rat) validation. While the engineering concept is well-demonstrated, it remains far from human clinical application.
When this study was published
Published in 2026, this represents cutting-edge work at the intersection of bioprinting, peptide biology, and smart biomaterials for bone regeneration.
The bigger picture
This study represents a convergence of peptide biology, bioprinting, and smart biomaterials. CGRP is well known for its roles in bone metabolism, pain signaling, and vascular regulation. By harnessing it through an engineered on-demand release system rather than passive delivery, this approach could set a new standard for 'intelligent' bone repair scaffolds that respond to external stimulation with precise peptide release.
Questions still open
- Could the CGRP released from these scaffolds cause pain or migraine-like effects given CGRP's known role in pain signaling?
- How long do the bioprinted DRG neurons remain viable and functional within the scaffold?
- Can this piezoelectric-neural bioprinting approach be scaled to larger bone defects in humans?
Common questions
What is CGRP and why is it important for bone healing?
How does ultrasound make this scaffold work?
Read the original research
Bioinspired Engineering of Streamlined Skeletal Interoception: Neural Bioprinted Piezoelectric Scaffolds for Neuro-Vascularized Bone Regeneration.
Advanced science (Weinheim, Baden-Wurttemberg, Germany), e24181
Citation
Su, Yingze; Wang, Haomin; Liu, Weixi; Chen, Kangming; Min, Yiyang; Zhu, Jinbo; Li, Xueyang; Su, Anning; Yang, Hao; Yang, Lei; Ji, Yun; Zhang, Yuxin; Zheng, Jisi; Yang, Chi; He, Chuanglong; Li, Tao; Chen, Shuo; Wu, Tao; Chen, Xiaodong. (2026). Bioinspired Engineering of Streamlined Skeletal Interoception: Neural Bioprinted Piezoelectric Scaffolds for Neuro-Vascularized Bone Regeneration.. Advanced science (Weinheim, Baden-Wurttemberg, Germany), e24181. https://doi.org/10.1002/advs.202524181