Neural Noise- Scientists have developed a 3D-printed spinal implant that targets PTEN to promote spinal cord repair.1
- Muting the “brake” on repair (PTEN) is the mechanistic approach underlying the bio-implant.1 1
Weekly enrichment (2026-07-20)
- The work was led by researchers at RCSI University of Medicine and Health Sciences (Tissue Engineering Research Group, TERG) and the Research Ireland AMBER Centre, and published open-access in the journal Bioactive Materials (2026, DOI 10.1016/j.bioactmat.2026.01.022); first author Tara K. McGuire, senior author Fergal J. O’Brien.2 3
- The scaffold is a hyaluronic acid matrix enriched with neurotrophic extracellular-matrix proteins (collagen IV and fibronectin), engineered to mimic the physical structure and stiffness of native spinal cord tissue.2 4
- siRNA was delivered using a non-viral glycosaminoglycan (GAG)-binding enhanced transduction (GET) peptide vector, forming GET-siRNA nanoparticles that successfully transfected primary neurons — a cell type generally considered difficult to transfect.2
- The target gene PTEN (phosphatase and tensin homolog) acts as a molecular “brake” on regeneration; silencing it de-represses the PI3K/AKT/mTOR signaling axis that drives neuronal survival and axon growth.2 5
- Functionalizing the scaffolds with PTEN-siRNA nanoparticles significantly enhanced neurite outgrowth versus unfunctionalized scaffolds, and the construct acted as a reservoir releasing siRNA-nanoparticles into complex neural tissue.2
- The study was conducted in laboratory (in vitro) models only; the authors state the next steps are in vivo testing to explore how RNA-activated biomaterials could bridge damaged spinal cord tissue and restore lost connections — specific quantitative regeneration or locomotor-recovery figures were not reported in the release.3 4
- The press release was issued February 18, 2026 by RCSI/EurekAlert, framing the implant as a route toward restoring function after paralysis, since central-nervous-system neurons normally have very limited capacity to regrow.3 4
- Context: PTEN knockdown is a broader theme in 2025–2026 spinal-cord research — a separate multichannel 3D-printed GelMA-based scaffold combined with siRNA-loaded lipid nanoparticles reported roughly 70% PTEN protein reduction two weeks after injection and improved motor recovery in rats, underscoring that combining physical guidance with PTEN silencing is a convergent strategy across labs.5