title: Polyethyleneimine-modified iron oxide nanoparticles for brain tumor drug delivery using magnetic targeting and intra-carotid administration.
abstract: This study aimed to examine the applicability of polyethyleneimine (PEI)-modified magnetic nanoparticles (GPEI) as a potential vascular drug/gene carrier to brain tumors. In vitro, GPEI exhibited high cell association and low cell toxicity--properties which are highly desirable for intracellular drug/gene delivery. In addition, a high saturation magnetization of 93 emu/g Fe was expected to facilitate magnetic targeting of GPEI to brain tumor lesions. However, following intravenous administration, GPEI could not be magnetically accumulated in tumors of rats harboring orthotopic 9L-gliosarcomas due to its poor pharmacokinetic properties, reflected by a negligibly low plasma AUC of 12 +/- 3 microg Fe/ml min. To improve "passive" GPEI presentation to brain tumor vasculature for subsequent "active" magnetic capture, we examined the intra-carotid route as an alternative for nanoparticle administration. Intra-carotid administration in conjunction with magnetic targeting resulted in 30-fold (p=0.002) increase in tumor entrapment of GPEI compared to that seen with intravenous administration. In addition, magnetic accumulation of cationic GPEI (zeta-potential = + 37.2 mV) in tumor lesions was 5.2-fold higher (p=0.004) than that achieved with slightly anionic G100 (zeta-potential= -12 mV) following intra-carotid administration, while no significant accumulation difference was detected between the two types of nanoparticles in the contra-lateral brain (p=0.187). These promising results warrant further investigation of GPEI as a potential cell-permeable, magnetically-responsive platform for brain tumor delivery of drugs and genes.
authors.affiliation: Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109-1065, USA.
authors.forename: Beata
authors.initials: B
authors.lastname: Chertok
authors.forename: Allan E
authors.initials: AE
authors.lastname: David
authors.forename: Victor C
authors.initials: VC
authors.lastname: Yang
mesh_terms: D000588:Amines / Q000032:analysis; D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage* / Q000494:pharmacology / Q000627:therapeutic use; D001932:Brain Neoplasms / Q000188:drug therapy*; D016923:Cell Death / Q000187:drug effects; D045744:Cell Line, Tumor; D004333:Drug Administration Routes; D016503:Drug Delivery Systems / Q000379:methods*; D005290:Ferric Compounds / Q000097:blood / Q000737:chemistry* / Q000493:pharmacokinetics / Q000494:pharmacology; D008279:Magnetic Resonance Imaging; D008280:Magnetics / Q000379:methods*; D008297:Male; D053758:Nanoparticles / Q000737:chemistry*; D011094:Polyethyleneimine / Q000737:chemistry* / Q000493:pharmacokinetics / Q000494:pharmacology; D051381:Rats; D011916:Rats, Inbred F344; D013499:Surface Properties / Q000187:drug effects
chemical_list: D000588:Amines; D000970:Antineoplastic Agents; D005290:Ferric Compounds; C000499:ferric oxide; D011094:Polyethyleneimine