title: Effect of pH-responsive alginate/chitosan multilayers coating on delivery efficiency, cellular uptake and biodistribution of mesoporous silica nanoparticles based nanocarriers.
abstract: Surface fuctionalization plays a crucial role in developing efficient nanoparticulate drug-delivery systems by improving their therapeutic efficacy and minimizing adverse effects. Here we propose a simple layer-by-layer self-assembly technique capable of constructing mesoporous silica nanoparticles (MSNs) into a pH-responsive drug delivery system with enhanced efficacy and biocompatibility. In this system, biocompatible polyelectrolyte multilayers of alginate/chitosan were assembled on MSN's surface to achieve pH-responsive nanocarriers. The functionalized MSNs exhibited improved blood compatibility over the bare MSNs in terms of low hemolytic and cytotoxic activity against human red blood cells. As a proof-of-concept, the anticancer drug doxorubicin (DOX) was loaded into nanocarriers to evaluate their use for the pH-responsive drug release both in vitro and in vivo. The DOX release from nanocarriers was pH dependent, and the release rate was much faster at lower pH than that of at higher pH. The in vitro evaluation on HeLa cells showed that the DOX-loaded nanocarriers provided a sustained intracellular DOX release and a prolonged DOX accumulation in the nucleus, thus resulting in a prolonged therapeutic efficacy. In addition, the pharmacokinetic and biodistribution studies in healthy rats showed that DOX-loaded nanocarriers had longer systemic circulation time and slower plasma elimination rate than free DOX. The histological results also revealed that the nanocarriers had good tissue compatibility. Thus, the biocompatible multilayers functionalized MSNs hold the substantial potential to be further developed as effective and safe drug-delivery carriers.
authors.affiliation: College of Chemistry, Chemical Engineering and Biotechnology, Donghua University , Shanghai 201620, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Feng
authors.forename: Wei
authors.initials: W
authors.lastname: Nie
authors.forename: Chuanglong
authors.initials: C
authors.lastname: He
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Zhou
authors.forename: Liang
authors.initials: L
authors.lastname: Chen
authors.forename: Kexin
authors.initials: K
authors.lastname: Qiu
authors.forename: Weizhong
authors.initials: W
authors.lastname: Wang
authors.forename: Zhiqi
authors.initials: Z
authors.lastname: Yin
mesh_terms: D000464:Alginates / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D004317:Doxorubicin / Q000008:administration & dosage; D004337:Drug Carriers; D020723:Glucuronic Acid / Q000737:chemistry; D006367:HeLa Cells; D006603:Hexuronic Acids / Q000737:chemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D014018:Tissue Distribution
chemical_list: D000464:Alginates; D004337:Drug Carriers; D006603:Hexuronic Acids; D012822:Silicon Dioxide; D004317:Doxorubicin; D020723:Glucuronic Acid; D048271:Chitosan