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Jun 13, 2010

Desarrollan nanocápsulas de carbono que podrían servir para tratar tumores

Belén Ballesteros, member of the Electron Microscopy Laboratory in CIN2 (ICN-CSIC), has co-authored the paper "Filled and glycosylated carbon nanotubes for in vivo radioemitter localization and imaging" recently published in Nature Materials. 

"A biomedical application of a nanoconjugate is now shown in vivo. Sealed carbon nanotubes filled with a radionucleotide are functionalized with carbohydrate molecules without prompting cargo release. The stability and biocompatibility of the capsule together with the radioactive payload allows in vivo imaging of the system and delivery of a high-density radiodose."

PRESS REFERENCES: 

NEWS AND VIEWS, ANTENA 3, COPE, 20 MINUTOS, NANOTECNOLÓGICA, DIARIO MÉDICO, PLATAFORMA SINC, NOTICIAS DE ÁLAVA, DIARIO DE MALLORCA

Functionalization of nanomaterials for precise biomedical function is an emerging trend in nanotechnology. Carbon nanotubes are attractive as multifunctional carrier systems because payload can be encapsulated in internal space whilst outer surfaces can be chemically modified. Yet, despite potential as drug delivery systems and radiotracers, such filled-and-functionalized carbon nanotubes have not been previously investigated in vivo. Here we report covalent functionalization of radionuclide-filled single-walled carbon nanotubes and their use as radioprobes. Metal halides, including Na125I, were sealed inside single-walled carbon nanotubes to create high-density radioemitting crystals and then surfaces of these filled-sealed nanotubes were covalently modified with biantennary carbohydrates, improving dispersibility and biocompatibility. Intravenous administration of Na125I-filled glyco-single-walled carbon nanotubes in mice was tracked in vivo using single-photon emission computed tomography. Specific tissue accumulation (here lung) coupled with high in vivo stability prevented leakage of radionuclide to high-affinity organs (thyroid/stomach) or excretion, and resulted in ultrasensitive imaging and delivery of unprecedented radiodose density. Nanoencapsulation of iodide within single-walled carbon nanotubes enabled its biodistribution to be completely redirected from tissue with innate affinity (thyroid) to lung. Surface functionalization of 125I-filled single-walled carbon nanotubes offers versatility towards modulation of biodistribution of these radioemitting crystals in a manner determined by the capsule that delivers them. We envisage that organ-specific therapeutics and diagnostics can be developed on the basis of the nanocapsule model described here.

Desarrollan nanocápsulas de carbono que podrían servir para tratar tumores

+ PRESS RELEASE + FULL ARTICLE + DOI: doi:10.1038/nmat2766