Review Article

Drug Delivery Systems, CNS Protection, and the Blood Brain Barrier

Table 3

Different types of organic nanoparticles, their uses, and application in biomedicine.

Organic nanoparticlesCompositionApplicationsAdvantages

Peptide-based nanoparticlesFerritin protein cage nanoparticles family of proteins, 10–500 nmChemically or genetically modified, multifunctional probes for tumor imaging; ferritin is pH dependent, nanoparticles (NPs) decorated with transferrin (Tf)Used for nasopharyngeal cancer-specific therapy

Lipid-based nanoparticleCholesterol mediated cationic solid nanoparticles 10–400 nmUsed for delivery of proteins and peptides and used for immune-stimulatory RNA adjuvant, cancer therapy, anti-viral agents, brain tumors.High drug entrapment efficiency and loading capacity

Solid lipid nanoparticles Colloidal 10–700 nmSolid lipid nanoparticles can be used as colloidal drug carriers for various therapeutics, pharmaceutical alternative of liposomes and emulsionsUsed to deliver drug orally, topically, or by inhalation

SiRNA delivery systemsSiRNA 5–40 nmUsed in malignant melanomas and cancer therapy Suppress effects of oncogenes effective vehicles for delivery of PrP

Colloidal drug carriers 10–400 nm diameters in size microemulsionsCargo carriers in vaccine therapies of CNS pathogens. High drug entrapment efficiency and loading capacity

Liposome drug carriers Closed spherical assemblies of amphiphilic delivery vehicles 10–700 nmFor therapeutic agents/drugs minimize systemic exposure, gene transfer vector, and mode of delivery, biocompatible and biodegradable materials, applications in biomedicine and food industry; liposomes can increase the drug distribution, bioavailability and its targeted action, anticancer drugsNontoxic biodegradable, prolong circulation of drugs

Magneto-liposomes
phospholipid bilayers
50–100 nontoxic biodegradable, nonantigenic, low systemic toxicity, prolong circulation of drugs,
controlled
Drug release cause pseudoallergic inflammation, controlled delivery of drugs in aqueous space within liposome, intercalated in to lipid bilayers, gene deliveryNontoxic biodegradable, low systematic toxicity, controlled drug release

Micelles An aggregate of surfactant molecules dispersed in a liquid colloid, micellar structures mainly core of block copolymerMicelles physically entrapped the drug and transport it to the target area and release required concentrations, formed by two fatty acyl chainsDeliver large amount of drugs to cancer cells

Polymeric micellesAn aggregate of surfactant molecules
dispersed in a liquid colloid, 10–800 nm
New drug carrier systems stability in plasma,
longevity, cancer chemotherapy obstruct tumor
angiogenesis
Potential targets of anticancer drugs

Carbon nanotubesCylindrical graphite sheets 1.5–5000 length and 0.5–20 diameter, traverse cell membrane as nanoneedles, thermalConductivity, target tumors. Insoluble in aqueous media, cytotoxic, poor incorporation capacity, targeted
delivery of drugs, genes, vaccines, antibodies, and thermotherapy of tumors
Traverse cell membrane, show thermal conductivity, and target tumors

Quantam dotsColloidal graphic sheets rolled in to single or multiwalled tubes <10 nm, predict emission frequencies, brighter and stable signal intensity, conjugate to proteins for targeting, composed of cytotoxic heavy metals, unstable in UV radiationUsed in vitro labeling of liver cells, fluorescent assays to detect antigens on cells, used in vivo cancer detection and diagnosisMore stable signals than fluorescent molecules, brighter, can bind with proteins

Dendrimers5–20 nm highly branched
macromolecules synthesized through
polymerization reaction, growing outward from a central core 5–10, branched structure allows high drug carriage
Cause dose and surface charge dependent hemolysis,
cytotoxic in vitro, targeted delivery of drugs in
aqueous space within liposome or intercalated in
to lipid bilayers, used in gene delivery
Show polymerization, terminal groups can be modified for drug targeting, show high drug carriage

Fullerenes1.5–5000 length and 0.5–20 diameter, very similar to carbon nanotubes an extended π conjugated carbon skeletons Vaporization of graphitesHeterofullerenes, 13 C labeled fullerenes, azafullerensHigher drug delivery for brain tumors