Construction of Hyaluronic Acid-Covered Hierarchically Porous MIL-nanoMOF for Loading and Controlled Release of Doxorubicin

The porous nano-sized metal-organic framework (nanoMOF) and its proper surface modification could greatly promote the drug loading capability and introduce biocompatibility, biodegradability, and targeting functions into nano-drug delivery systems. Herein, the HACD@ADA-PA/MIL-101_NH2 (Fe)-P nanoparticle was successfully fabricated through supramolecular and coordination interactions from three building blocks, including hierarchically porous MIL-101_NH2 (Fe)-P nanoMOF, phosphite-modified adamantane (ADA-PA), and beta-cyclodextrin (beta-CD)-modified hyaluronic acid (HACD). The obtained HACD@ADA-PA/MIL-101_NH2 (Fe)-P nanoparticle was nano-sized and highly stable in physiological fluids. The porous structure of HACD@ADA-PA/MIL-101_NH2 (Fe)-P nanoparticle could effectively load the commercial chemotherapeutic drug doxorubicin (DOX) with an encapsulation rate of 41.20 % and a loading rate of 48.84 %. The obtained drug-loaded HACD@ADA-PA/MIL-101_NH2 (Fe)-P@DOX nanoparticle was pH-sensitive and relatively stable at neutral condition (pH 7.2) but could release DOX in a controlled way in subacid solution at pH 5.7. The simulated in vitro DOX release experiment signified that the HACD@ADA-PA/MIL-101_NH2 (Fe)-P@DOX nanoparticle could realize the controlled release of DOX in tumor issues.