Elasticity of mesoporous nanocapsules regulates cellular uptake, blood circulation, and intratumoral distribution.

The elasticity of nanoparticles plays a critical role in regulating nanoparticle-biosystem interactions. However, the elasticity of traditional organic-based carriers can only be regulated within a narrow range, and the effects of elasticity on biological processes have not been evaluated until now. Here, we construct hyaluronic acid modified mesoporous organosilica nanoparticles (MONs-HA) with a wide range of elasticity by an interior preferential etching approach and investigate the impact of their elasticity on cellular uptake, blood circulation, and tumor accumulation. The Young's moduli of the prepared MONs-HA are 1.64, 0.93, 0.78, 0.4 and 0.29 GPa (denoted as rigid MONs-HA, semi-elastic MONs-HA and MONs-HA, elastic MONs-HA and MONs-HA), respectively. They all possess a similar hydrodynamic size (245-257 nm), similar surface electronegativity (-27 to -35 mV), and excellent dispersibility. experiments demonstrate that the elastic MONs-HA and MONs-HA (0.4 and 0.29 GPa) exhibit significantly greater cellular uptake relative to semi-elastic MONs-HA and MONs-HA (0.93 and 0.78 GPa) or rigid MONs-HA (1.64 GPa). Simultaneously, these elastic MONs-HA and MONs-HA show an efficiently prolonged circulation time. results revealed that the elastic MONs-HA show enhanced tumor accumulation compared to semi-elastic and rigid MONs-HA after intravenous administration. These desirable features of elasticity can direct the design of nanoplatforms, leading to an enhanced tumor delivery efficiency.