Nano Archive

Nanoparticles in photodynamic therapy: An emerging paradigm.

Chatterjee, D. K. and Fong, L. S. and Zhang, Y (2008) Nanoparticles in photodynamic therapy: An emerging paradigm. Advanced drug delivery reviews, 60 (15). pp. 1627-1637. ISSN 1872-8294

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Photodynamic therapy (PDT) has emerged as one of the important therapeutic options in management of cancer and other diseases [M. Triesscheijn, P. Baas, J.H. Schellens, F.A. Stewart, Photodynamic therapy in oncology, Oncologist 11 (2006) 1034-1044]. Most photosensitizers are highly hydrophobic and require delivery systems. Previous classification of delivery systems was based on presence or absence of a targeting molecule on the surface [Y.N. Konan, R. Gurny, E. Allemann, State of the art in the delivery of photosensitizers for photodynamic therapy, J. Photochem. Photobiol., B 66 (2002) 89-106]. Recent reports have described carrier nanoparticles with additional active complementary and supplementary roles in PDT. We introduce a functional classification for nanoparticles in PDT to divide them into passive carriers and active participants in photosensitizer excitation. Active nanoparticles are distinguished from non-biodegradable carriers with extraneous functions, and sub-classified mechanistically into photosensitizer nanoparticles, [A.C. Samia, X. Chen, C. Burda, Semiconductor quantum dots for photodynamic therapy, J. Am. Chem. Soc. 125 (2003) 15736-15737, R. Bakalova, H. Ohba, Z. Zhelev, M. Ishikawa, Y. Baba, Quantum dots as photosensitizers? Nat. Biotechnol. 22 (2004) 1360-1361] self-illuminating nanoparticles [W. Chen, J. Zhang, Using nanoparticles to enable simultaneous radiation and photodynamic therapies for cancer treatment, J. Nanosci. Nanotechnology 6 (2006) 1159-1166] and upconverting nanoparticles [P. Zhang, W. Steelant, M. Kumar, M. Scholfield, Versatile photosensitizers for photodynamic therapy at infrared excitation, J. Am. Chem. Soc. 129 (2007) 4526-4527]. Although several challenges remain before they can be adopted for clinical use, these active or second-generation PDT nanoparticles probably offer the best hope for extending the reach of PDT to regions deep in the body.

Item Type:Article
Additional Information:Article Outline 1. Introduction 2. Challenges to clinical adoption of PDT 2.1. Photosensitizers 2.2. Light wavelength 2.3. Selective drug delivery 3. Nanoparticles in PDT 3.1. Passive nanoparticles 3.1.1. Biodegradable nanoparticle carriers 3.1.2. Non-biodegradable nanoparticle carriers 3.2. Active nanoparticles 3.2.1. Photosensitizer nanoparticles 3.2.2. Self-lighting nanoparticles 3.2.3. Upconversion nanoparticles 4. Conclusion Acknowledgements References Fig. 1. Principle stages of photodynamic therapy. Photosensitizer (in syringe or tube) is applied locally or systemically (Stage I), accumulates in tumors (Stage II) and is then activated by external illumination (Stage III). This induces cell damage and death. View Within Article
Uncontrolled Keywords:Photodynamic therapy; Photosensitizers; Nanoparticles
Subjects:Biomedical Science > Nanotechnology for human health
Biomedical Science > Nanomedicine
ID Code:51
Deposited By:Lesley Tobin
Deposited On:25 Nov 2008 14:45
Last Modified:19 Feb 2009 09:17

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