UNIGE document Scientific Article
previous document  unige:4108  next document
add to browser collection

The in vivo performance of magnetic particle-loaded injectable, in situ gelling,carriers for the delivery of local hyperthermia

Faes, Antonin
Petri-Fink, Alke
Hofmann, Heinrich
Rüfenacht, Daniel
Bosman, Frederik
show hidden authors show all authors [1 - 9]
Published in Biomaterials. 2009, vol. 31, no. 4, p. 691-715
Abstract We investigated the use of in situ implant formation that incorporates superparamagnetic iron oxide nanoparticles (SPIONs) as a form of minimally invasive treatment of cancer lesions by magnetically induced local hyperthermia. We developed injectable formulations that form gels entrapping magnetic particles into a tumor. We used SPIONs embedded in silica microparticles to favor syringeability and incorporated the highest proportion possible to allow large heating capacities. Hydrogel, single-solvent organogel and cosolvent (low-toxicity hydrophilic solvent) organogel formulations were injected into human cancer tumors xenografted in mice. The thermoreversible hydrogels (poloxamer, chitosan), which accommodated 20% w/v of the magnetic microparticles, proved to be inadequate. Alginate hydrogels, however, incorporated 10% w/v of the magnetic microparticles, and the external gelation led to strong implants localizing to the tumor periphery, whereas internal gelation failed in situ. The organogel formulations, which consisted of precipitating polymers dissolved in single organic solvents, displayed various microstructures. A 8% poly(ethylene-vinyl alcohol) in DMSO containing 40% w/v of magnetic microparticles formed the most suitable implants in terms of tumor casting and heat delivery. Importantly, it is of great clinical interest to develop cosolvent formulations with up to 20% w/v of magnetic microparticles that show reduced toxicity and centered tumor implantation.
Keywords In situ forming implantIntratumoral injectionPhysical gelsSuperparamagnetic nanoparticlesSilica composite microparticlesMagnetic induced hyperthermia
PMID: 19878991
Full text
Article (Published version) (2.7 MB) - document accessible for UNIGE members only Limited access to UNIGE
(ISO format)
LE RENARD, Pol-Edern et al. The in vivo performance of magnetic particle-loaded injectable, in situ gelling,carriers for the delivery of local hyperthermia. In: Biomaterials, 2009, vol. 31, n° 4, p. 691-715. doi: 10.1016/j.biomaterials.2009.09.091 https://archive-ouverte.unige.ch/unige:4108

527 hits



Deposited on : 2009-11-24

Export document
Format :
Citation style :