Shear-Responsive Drug Delivery Systems

Shear-responsive drug delivery systems exploit variations in fluid shear stress to trigger the controlled release of therapeutic agents at specific physiological sites. By harnessing mechanical forces arising from blood flow or tissue deformation, these platforms achieve on-demand delivery in regions of elevated shear—such as stenotic vessels, thrombogenic circuits or tumour microenvironments—while minimising off-target exposure. Central to their function are mechanoresponsive materials that undergo conformational changes, phase transitions or disassembly when subjected to defined shear thresholds. Common designs include shear-sensitive nanoparticles and liposomes that deform or disaggregate under flow, as well as hydrogel matrices embedded with lipid carriers that expel cargo upon shear deformation. Integration with microfluidic assays enables precise characterisation of activation conditions, guiding optimisation of material composition, particle size and release kinetics. Collectively, these innovations promise enhanced targeting of antithrombotics, chemotherapeutics and other agents, reduced systemic toxicity and improved compatibility with blood-contacting devices. Key challenges remain in tuning activation thresholds to physiological flows, ensuring long circulation times and translating in vitro findings into robust clinical platforms.

Research from Nature Portfolio

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Research from all publishers

Several studies published in the past two years have advanced the design and evaluation of shear-responsive carriers. One investigation focused on antithrombotic therapy in extracorporeal circuits by engineering shear-responsive nanoparticles that remain stable under normal flow yet release anticoagulants at high shear zones. This approach balanced thrombus prevention against bleeding risk and highlighted the need for in vitro microfluidic models to predict in vivo performance. A second study employed liposomes embedded within tissue-mimetic hydrogels of varying elasticity to examine shear-triggered release. Under controlled shear deformation, the soft matrices expelled encapsulated liposomes in a reversible manner, demonstrating that matrix stiffness and liposome–gel interactions can be tuned to modulate release profiles. A third work reviewed the structural dynamics of liposomal carriers under shear, categorising shear-induced disaggregation and deformation mechanisms. It offered design guidelines for selecting lipid compositions and vesicle architectures that respond selectively to pathological shear regimes, thereby improving targeted delivery in vascular and tumour settings.

Shear-Responsive Drug Delivery Systems publication trend

The graph below shows the total number of articles in shear-responsive drug delivery systems across all publications each year (not limited to Nature Index journals).

Technical terms

Shear stress: Mechanical force per unit area exerted by fluid flow that can deform or trigger responses in materials.

Nanocarrier: Nanoscale vehicle (such as a liposome or polymeric particle) designed to transport and release therapeutic agents.

Hydrogel matrix: Water-swollen, crosslinked polymer network used to embed drug carriers and modulate release under mechanical stimuli.

Liposome: Spherical vesicle composed of lipid bilayers, capable of encapsulating drugs and responding to environmental triggers.

Mechanoresponsive: Property of a material to undergo a physical or chemical change in response to mechanical forces such as shear.

References

1. Shear‐Responsive Drug Delivery Systems in Medical Devices: Focus on Thrombosis and Bleeding. Advanced Functional Materials (2023).
2. Shear‐Triggered Release of Lipid Nanoparticles from Tissue‐Mimetic Hydrogels. Macromolecular Rapid Communications (2023).
3. Liposomes Under Shear: Structure, Dynamics, and Drug Delivery Applications. Advanced NanoBiomed Research (2023).