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A new RNA-activated scaffold provides a physical and biological environment that encourages injured neurons to bypass the PTEN \u201cbrake\u201d and regrow after spinal cord injury. Credit: Neuroscience News<\/p>\nSummary: Spinal cord injuries have long been considered permanent because neurons in the central nervous system lack the natural ability to regrow. However, researchershave developed a novel, 3D-printed implant that could change that.<\/p>\n
The study details a multifunctional scaffold designed to mimic the spinal cord\u2019s physical structure while delivering tiny RNA-loaded particles. These particles \u201csilence\u201d a specific gene called PTEN, which acts as a biological brake on nerve regrowth. By removing this internal barrier and providing physical support, the implant significantly enhanced neuron growth in laboratory models, offering a new path toward restoring function after paralysis.<\/p>\n
Key Facts<\/p>\n
The Dual-Action Scaffold: The implant provides both a physical 3D structure for cells to latch onto and a biological signal to trigger repair.Silencing the Brake: The implant delivers siRNA to silence the PTEN gene, which is responsible for suppressing the regenerative capacity of neurons after an injury.Biomimetic Design: The 3D-printed structure is engineered to match the specific stiffness and anatomy of the human spinal cord to prevent further tissue damage and encourage integration.Nerve Regrowth: In lab models, injured neurons exposed to the RNA-activated implant showed a \u201csignificantly enhanced\u201d capacity to grow across the injury site.Patient-Centered Research: The project was developed with input from the Irish Rugby Football Union Charitable Trust, ensuring the research remains relevant to the needs of those living with spinal cord injuries.<\/p>\n
Source: RCSI<\/p>\n
Researchers from RCSI University of Medicine and Health Sciences have developed a novel implant that delivers tiny growth-promoting particles directly to injured nerve cells, helping them to regrow after spinal cord injury.\u00a0<\/p>\n
The study,\u00a0published in the journal\u00a0Bioactive Materials, shows how a 3D implant designed to mimic the structure and stiffness of the spinal cord can be combined with tiny particles engineered to carry RNA to encourage nerve cells (neurons) to grow.<\/p>\n
The work was led by researchers at RCSI\u2019s\u00a0Tissue Engineering Research Group\u00a0(TERG) and the Research Ireland Centre for Advanced Materials and\u00a0BioEngineering\u00a0Research (AMBER).\u00a0<\/p>\n
A new RNA-activated scaffold provides a physical and biological environment that encourages injured neurons to bypass the PTEN \u201cbrake\u201d and regrow after spinal cord injury. Credit: Neuroscience News<\/p>\n
Spinal cord injuries often result in permanent paralysis because damaged neurons in the central nervous system have\u00a0a very limited\u00a0capacity to regrow. While biomaterial implants can provide physical support at the injury site, these cells also face molecular barriers that prevent their regrowth.\u00a0<\/p>\n
To overcome this, the team developed a multifunctional implant that not only supports regenerating tissue but also delivers RNA-based signals that encourage neurons to switch their growth mechanisms back on.\u00a0<\/p>\n
These signals target one such barrier, a gene called PTEN, which is known to suppress neuron regrowth after injury. By silencing PTEN at the injury site, the implant helps remove an internal barrier to\u00a0repair in\u00a0these cells.\u00a0<\/p>\n
\u201cWe\u2019ve created an environment that both physically and biologically re-enhances the regenerative capacity of injured neurons, which is a key requirement for restoring function after spinal cord injury,\u201d said Professor\u00a0Fergal O\u2019Brien, Deputy Vice Chancellor for Research and Innovation, Professor of Bioengineering and Regenerative Medicine and Head of RCSI TERG.\u00a0<\/p>\n
\u201cIn laboratory models of spinal cord injury, neurons exposed to the RNA-activated implant showed significantly enhanced growth.\u201d\u00a0\u00a0<\/p>\n
The research was developed with guidance from an advisory panel supported by the Irish Rugby Football Union Charitable Trust (IRFU-CT), bringing together people living with spinal cord injury, clinicians,\u00a0neuroscientists\u00a0and engineers to shape research priorities and ensure relevance to patients\u2019 real-world needs.\u00a0<\/p>\n
\u201cWhile this study focused on laboratory models, the next steps will to be to test the approach\u00a0in vivo\u00a0and explore how RNA-activated biomaterials could help bridge damaged spinal cord tissue and restore lost connections,\u201d said Dr Tara McGuire who carried out the research as a PhD student in TERG.\u00a0<\/p>\n
Funding: The study was supported by the IRFU-CT and Research Ireland with\u00a0additional\u00a0funding from the Anatomical Society and the Health Research Board.\u00a0<\/p>\n
Key Questions Answered:Q: Why don\u2019t spinal nerves just heal like skin or bone?<\/p>\n
A: Unlike the rest of your body, the central nervous system has \u201cinternal brakes\u201d\u2014like the PTEN gene\u2014that actively stop neurons from growing once you reach adulthood. This evolved to keep the brain\u2019s wiring stable, but it makes injury recovery nearly impossible without intervention.<\/p>\n
Q: How does the RNA \u201csilencing\u201d work?<\/p>\n
A: Think of it like a molecular \u201cmute\u201d button. The siRNA delivered by the implant tells the cell to stop producing the PTEN protein. Without that protein to hold them back, the neurons \u201cswitch on\u201d their growth mechanisms and start reaching out to reconnect.<\/p>\n
Q: Is this ready for human patients?<\/p>\n
A: Not yet. The research has shown incredible success in laboratory models. The next phase involves in vivo testing to see if the \u201cRNA bridge\u201d can successfully restore movement and sensation in living subjects.<\/p>\n
Editorial Notes:This article was edited by a Neuroscience News editor.Journal paper reviewed in full.Additional context added by our staff.About this spinal cord injury and neurotech research news<\/p>\n
Author: Laura Anderson<\/a>
Source: RCSI<\/a>
Contact: Laura Anderson \u2013 RCSI
Image: The image is credited to Neuroscience News<\/p>\n