Development and in vitro safety evaluation of pramipexole-loaded hollow mesoporous silica (HMS) particles (original) (raw)
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Development of MCM-41 mesoporous silica nanoparticles as a platform for pramipexole delivery
Journal of Drug Delivery Science and Technology, 2019
Herein, we present development of new pH-responsive drug delivery systems for D3dopamine receptor agonist pramipexole, based on its encapsulation in MCM-41 mesoporous silica particles. Pramipexole loaded particles were further coated with chitosan and/or sodium alginate in order to modify drug release. The prepared pramipexole loaded nanoparticles were characterized by using X-ray diffraction (XRD), N 2-physisorption, dynamic light scattering (DLS), TEM and attenuated total reflection infrared (ATR-FTIR) spectra. The post-coating of pramipexole loaded MCM-41 with chitosan/sodium alginate polymers changed dramatically physicochemical properties of the particles. The release profile showed that combination of both polymers led to significant reduction by approximately 50% in the initial burst-release effect at both tested pH values (1.2 and 6.8). Uncoated MCM-41 released the total amount of pramipexole within the first 15 min, whereas double-coated particles reached full release after 300 min. Interestingly, we found that pramipexole loaded MCM-41 particles showed a higher potential in preventing H 2 O 2-induced oxidative damage in human neuroblastoma SH-SY5Y cells, compared to the free drug. In conclusion, pramipexole loading in chitosan/ sodium alginate coated MCM-41 might represent a promising drug delivery strategy for modified release and neuronal protection against oxidative damage, observed in Parkinson's disease.
Characterization and Comparison of Mesoporous Silica Particles for Optimized Drug Delivery
Nanomaterials and Nanotechnology, 2014
In this study we have investigated the suitability of a number of different mesoporous silica nanoparticle structures for carrying a drug cargo. We have fully characterized the nanoparticles in terms of their physical parameters; size, surface area, internal pore size and structure. These data are all required if we are to make an informed judgement on the suitability of the structure for drug delivery in vivo. With these parameters in mind, we investigated the loading/unloading profile of a model therapeutic into the pore structure of the nanoparticles. We demonstrate that the release can be controlled by capping the pores on the nanoparticles to achieve temporal control of the unloading. We have also examined the rate and mechanism of the degradation of the nanoparticles over an extended period of time. The eventual dissolution of the nanoparticles after cargo release is a desirable property for a drug delivery system.
Silica Particles: A Novel Drug-Delivery System
Advanced Materials, 2004
In recent decades, significant advances in drug-delivery systems have enabled more effective drug administration. To deliver drugs to specific organs, a range of organic systems (e.g., micelles, liposomes, and polymeric nanoparticles) have been designed. They suffer from limitations, including poor thermal and chemical stability, and rapid elimination by the immune system. In contrast, silica particles offer a biocompatible, stable, and “stealthy” alternative. Bioactive molecules can be easily encapsulated within silica particles by combining sol–gel polymerization with either spray-drying or emulsion chemistry. Spray-drying faces challenges, including low yield, surface segregation, and size limitations. In contrast, sol–gel emulsions enable the production of nanoparticles with homogeneous drug distribution, and permit ambient temperature processing, necessary for handling biologicals. Independent control of the size and release rate can be readily achieved. Preliminary in-vivo experiments reveal enhanced blood stability of the nanoparticles, which, coupled with sustained release of anti-tumor agents, show good potential for cancer treatment.
Therapeutic Potential of Polymer-Coated Mesoporous Silica Nanoparticles
Applied Sciences, 2019
Mesoporous silica nanoparticles (MSNs) find tremendous applications in drug delivery due to several advantages such as their easy fabrication process, high drug loading, biodegradability, biocompatibility, and so forth. Nevertheless, despite several advantages, the use of this striking drug delivery carrier is restricted due to premature drug release owing to the porous structure. Coating of the pores using polymers has emerged as a great solution to this problem. Polymer coatings, which act as gatekeepers, avoid the premature release of loaded content from MSNs and offers the opportunity for controlled and targeted drug delivery. Therefore, in this review, we have compiled the polymer-based coating approaches used in recent years for improving the drug delivery capability of MSNs. This manuscript provides an insight into the research about the potential of polymer-coated MSNs, allowing the selection of right polymer for coating purposes according to the desired application.
Mesostructured silica based delivery system for a drug with a peptide as a cell-penetrating vector
Microporous and Mesoporous Materials, 2009
a b s t r a c t A drug delivery system using mesostructured silica as a reservoir has been developed for the storage and controlled release of a drug with a cell-penetrating peptide (CPP) as a vector. We use fluorescein isothiocyanate (FITC) as the drug model and octaarginine (R8) as a vector to endow the drug with cell-penetrating property. The mesostructured silica reservoir system was prepared by using a one-pot liquid-crystal templating method, which is suitable for the encapsulation of intact FITC-R8 conjugates and sustained release of drugs without hampering their properties. The hydrophobic poly(propyl oxide) (PPO) shell of the pore-filling Pluronic F127 and the electrostatic interaction between R8 and siloxide ions on the pore walls act as the diffusion-limiting factors of the FITC-R8 conjugate. A sigmoidal in vitro release of FITC-R8 from mesostructured silica into phosphate buffered saline (PBS, pH 7.4) was observed and the typical release duration was 5 days at 37°C. Release from the reservoir yielded significant elongation in duration of the FITC signals in DU145 cells by confocal microscopic analysis, compared with a single administration of FITC-R8.
In vitro bioactivity and drug release kinetics studies of mesoporous silica-biopolymer composites
Targeted drug delivery systems become highly significant in certain diseases where the required dosage of drug cannot be delivered due to poor blood circulation in the targeted hard tissues. The present study reports a simple method of preparing mesoporous silica (SBA-15)/ Biopolymer composite and loading an antibiotic in the silica scaffold which may find applications in bone drug delivery system. The SBA-15 was prepared under different conditions and analyzed for its texture and structural properties. The as prepared silica was characterized by low angle X-ray diffraction and BET surface area measurement which shows mesoporosity associated with hexagonally organized channels, a narrow pore size distribution and a large surface area. Chitin and Chitosan were the biopoly-mers used in the preparation of composites and bioactivity of the composites was investigated in the SBF medium. Ciprofloxacin was used as a model drug molecule in the drug delivery studies as its molecular size is suitable for inclusion within the mesopores of the SBA-15 material. The in vitro drug release was investigated in the simulated body fluid medium. The mesoporous silica's were found to be highly bioactive and found to possess sustained drug delivery kinetics.
Mesoporous silica nanoparticles in target drug delivery system: A review
International Journal of Pharmaceutical Investigation, 2015
Due to lack of specifi cation and solubility of drug molecules, patients have to take high doses of the drug to achieve the desired therapeutic effects for the treatment of diseases. To solve these problems, there are various drug carriers present in the pharmaceuticals, which can used to deliver therapeutic agents to the target site in the body. Mesoporous silica materials become known as a promising candidate that can overcome above problems and produce effects in a controllable and sustainable manner. In particular, mesoporous silica nanoparticles (MSNs) are widely used as a delivery reagent because silica possesses favorable chemical properties, thermal stability, and biocompatibility. The unique mesoporous structure of silica facilitates effective loading of drugs and their subsequent controlled release of the target site. The properties of mesoporous, including pore size, high drug loading, and porosity as well as the surface properties, can be altered depending on additives used to prepare MSNs. Active surface enables functionalization to changed surface properties and link therapeutic molecules. They are used as widely in the fi eld of diagnosis, target drug delivery, bio-sensing, cellular uptake, etc., in the bio-medical fi eld. This review aims to present the state of knowledge of silica containing mesoporous nanoparticles and specifi c application in various biomedical fi elds.
Emergent Materials
Being a developed and promising approach, nanotechnology has attracted a lot of attention in biomedical and pharmaceutical therapy applications. Among nanostructured materials, mesoporous silica nanoparticles (MSNs) are effectively used as nanocarriers for drug delivery systems. MSNs can be tailored-designed by different synthetic techniques. Their morphological characteristics dictate the type of application of such materials. Recently, polymer-based materials have been employed to functionalize the MSNs surface. These modified nanocarriers are loaded with the drug and can unload their "cargo" upon exposure to either endogenous or exogenous types of stimuli. In this study, different targeting concepts, including passive, active, vascular, nuclear, and multistage targeting, are discussed.
Role of mesoporous silica nanoparticles for the drug delivery applications
Materials Research Express
The mesoporous silica nanoparticles (MSNs), because of the synthesis, ease of surface functionalization, tunable pore size, large surface area, and biocompatibility, are being useful in many of the biomedical applications like drug delivery, theranostics, stem cell research, etc. It has been a potent nanocarrier for many different therapeutic agents, i.e., the surface functionalization of silica nanoparticles (SNs) with chemical agents, polymers, and supramolecular moieties enable the efficient delivery of therapeutic agents in a highly controlled manner. Also, the toxicity, biosafety, and in vivo efficiency involving biodistribution, pharmacokinetics, biodegradation, and excretion of MSNs play an important role in its involvement in the clinical applications. A coherence between chemistry and biological sciences extends its opportunities to a wide range in the field of nanomedicine such as smart drug delivery systems, functionalization and gating approach, controlled drug delivery systems, diagnostic and targeted theragnostic approach etc. Thus, taking advantage of the inbuilt properties of the MSNs applicable to the biomedical sector, the present review describes a panorama on the SNs which are presently used for the development of theragnostic probes and advanced drug delivery platforms.