Humanoid Robotic Loading Enhances Mechanotransduction in Tendon Tissue Engineering
PMC13009534
· 10.34133/cbsystems.0542
Gap Declaration
Inclusion of tendon-derived cells, endothelial populations, and vascular elements will be important to improve physiological relevance. Fifth, no functional assessment of the constructs was conducted at the endpoint. In addition to the absence of histological evaluation for tendon-like matrix deposition, such as collagen type I or tenomodulin, mechanical testing and analysis of ECM organization will be required in future studies to determine whether multiaxial loading promotes construct-level maturation. In addition, integrating sensors to monitor key nutrients, metabolites, and environmental factors such as oxygen levels, along with developing computational models, will provide a deeper understanding of the cellular environment and contribute to more effective tendon repair strategies. While passive shear or torsional deformation may occur within the bioreactor chamber, these components were not quantified in the present study.
Abstract
Mechanical stimulation is essential in tissue engineering and regenerative medicine for proper tissue maturation. However, conventional uniaxial platforms fail to reproduce the multiaxial loading experienced in vivo. In this study, we present a humanoid robotic bioreactor capable of delivering human-like shoulder motions to engineered tendon constructs, enabling controlled multiaxial stimulation with real-time strain monitoring. Human mesenchymal stem cells were cultured on decellularized tendon scaffolds and subjected to adduction–abduction loading at peak strains of approximately 3.5% and 9.5% under external forces of 25 and 50 N, respectively. Strain levels were directly quantified in situ using a flexible sensor integrated within the bioreactor. The transparent bioreactor membrane allo…
Conclusions / Discussion
Discussion Equipping flexible bioreactor chambers with soft sensors has enabled the precise application and monitoring of mechanical dynamic stimulation on growing cells with both the multiaxial robotic and uniaxial platforms. We have also successfully monitored cell growth noninvasively by performing confocal microscopy directly through the thin transparent TPU membrane. Our experiments have identified distinct transcriptomic and protein-level responses under matched peak tensile strain conditions, with multiaxial stimulation inducing greater changes in mechanosensitive signaling pathways compared with uniaxial loading. Remarkably, the integrated strain sensor verified that the applied strain magnitudes were comparable between platforms. Therefore, the distinct biological responses are likely associated with differences in mechanical load delivery mode rather than strain magnitude alone. Under mechanical stimulation, a similar decrease in cell viability is noted in both platforms, particularly at 3.5% strain. However, this decrease should not necessarily be interpreted solely as evidence of acute cytotoxic damage. Although metabolic activity declined, microscopic observations and …
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