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Inorganic hollow nanoparticles and nanotubes in nanomedicine: Part 1. Drug/gene delivery applications

https://doi.org/10.1016/j.drudis.2007.06.002Get rights and content

Recent cytotoxicity studies on carbon nanotubes have shown that the biocompatibility of nanomaterial might be determined mainly by surface functionalization, rather than by size, shape, and material. Although the cytotoxicity for individual inorganic hollow nanomaterials should be extensively tested in vitro and in vivo, potential safety concerns about the use of inorganic nanomaterials in biomedical applications could be alleviated with proper surface treatment. Inorganic hollow nanoparticles and nanotubes have attracted great interest in nanomedicine because of the generic transporting ability of porous material and a wide range of functionality that arises from their unique optical, electrical, and physical properties. In this review, we describe recent developments of hollow and porous inorganic nanomaterials in nanomedicine, especially for drug/gene delivery.

Section snippets

Carbon nanotube

Carbon nanotubes are the leading inorganic nanomaterial for biomedical application, and their toxicology and pharmacology were extensively reviewed by Kostarelos's group 7, 8. Although carbon nanotubes (CNTs) have attracted increasing attention as new vectors for the delivery of therapeutic molecules, because of the easiness of translocation across cell membranes and low toxicity 9, 10, 11, 12, issues about the ultimate biocompatibility of CNTs have limited their widespread use in biomedical

Conclusion

In this article, we have reviewed hollow and porous inorganic nanomaterials in nanomedicine, focusing on the drug/gene delivery. The unique properties of a variety of inorganic materials such as mesoporous silica, quantum dot, CNT and gold nanoshell make it possible to enhance, or even surpass, the capabilities of conventional delivery. However, more research is needed before the hollow and porous inorganic nanomaterials are able to be used outside the laboratory. For controlled drug/gene

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