Mechanical Properties of Nanoparticle Drug Delivery Systems

Mechanical properties such as stiffness, elasticity and deformability critically influence the performance of nanoparticle drug carriers. Young’s modulus provides a quantitative metric for stiffness, guiding design of particles that must balance circulation time, tissue penetration and cellular uptake. Softer nanoparticles can deform to traverse dense biological barriers and evade rapid clearance, whereas stiffer constructs may enhance targeted uptake by specific cell types or prolong residence at disease sites. Control of core rigidity and shell mechanics has been shown to regulate interactions with immune cells, modulate endocytic pathways and fine-tune release kinetics. By integrating mechanical tuning with surface chemistry and size optimisation, researchers are developing next-generation delivery platforms with improved biodistribution, barrier crossing and therapeutic efficacy for applications ranging from oncology to inflammatory disease.

Research from Nature Portfolio

In vitro and in vivo tumour studies with nanolipogels of tunable elasticity have shown that softer particles (<1.6 MPa) accumulate more efficiently in breast tumours whereas stiffer counterparts preferentially localise in organs such as the liver. In parallel, semi-elastic core–shell nanoparticles with moderate rigidity navigate biological hydrogels and intestinal barriers more effectively than purely soft or hard analogues, yielding up to eight-fold enhancement in oral bioavailability of chemotherapeutic agents. Studies of soft microgels embedded in agarose matrices reveal that particle shrinkage under confinement can accelerate diffusion by up to two orders of magnitude, underscoring the role of long-range interactions and deformability in crowded environments.

Mechanical Properties of Nanoparticle Drug Delivery Systems publication trend

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

Technical terms

Young’s modulus: Quantitative measure of a material’s stiffness, defined as stress over strain in the elastic region.

Elasticity: Ability of a nanoparticle to deform under force and recover its original shape upon force removal.

Hydrogel: Three-dimensional network of crosslinked polymers swollen with water, used here as a tunable core for drug carriers.

Transcytosis: Cellular transport process in which particles are taken up on one side of a cell and released on the opposite side, enabling barrier crossing.

Endocytosis: Mechanism of cellular uptake involving invagination of the cell membrane; subtypes include clathrin-mediated and caveolae-mediated pathways.

References

1. Nanoparticle elasticity directs tumor uptake. Nature Communications (2018).
2. Rapid transport of deformation-tuned nanoparticles across biological hydrogels and cellular barriers. Nature Communications (2018).
3. Spontaneous shrinking of soft nanoparticles boosts their diffusion in confined media. Nature Communications (2019).
4. Softness enhanced macrophage-mediated therapy of inhaled apoptotic-cell-inspired nanosystems for acute lung injury. Journal of Nanobiotechnology (2023).
5. The Effect of Elasticity of Gelatin Nanoparticles on the Interaction with Macrophages. Pharmaceutics (2023).
6. Probing the Effect of Rigidity on the Cellular Uptake of Core‐Shell Nanoparticles: Stiffness Effects are Size Dependent. Small (2022).