Porphyrins in Photodynamic Therapy - A Search for Ideal Photosensitizers

ISSN: 1875-5992 (Online)
ISSN: 1871-5206 (Print)


Volume 16, 12 Issues, 2016


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Anti-Cancer Agents in Medicinal Chemistry

Formerly: Current Medicinal Chemistry - Anti-Cancer Agents

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Michelle Prudhomme
Universite Blaise Pascal - C.N.R.S
Aubiere Cedex
France


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Porphyrins in Photodynamic Therapy - A Search for Ideal Photosensitizers



Anti-Cancer Agents in Medicinal Chemistry, 2(2): 187-207.

Author(s): S. K. Pushpan, S. Venkatraman, V. G. Anand, J. Sankar, D. Parmeswaran, S. Ganesan and T K Chandrashekar.

Affiliation: Department of Chemistry, Indian Institute of Technology, Kanpur- 208 016, India

Abstract

The utility of light as a therapeutic agent can be traced back over thousands of years when it was used in Ancient Egypt, India and China to treat a variety of skin diseases like psoriasis, vitiligo, rickets, cancer and psychosis. The isolation of porphyrins and their inherent tumor localizing properties coupled with its ability to generate reactive singlet oxygen when activated by light of particular wavelength which in turn results in cytotoxicity led to the emergence of a new modality namely, photodynamic therapy (PDT) as a therapeutic tool. The higher degree of selectivity offered by this modality and fewer side effects when compared to chemotherapy and radiotherapy has prompted the researchers around the globe to generate new photosensitizers. Porphyrins and expanded porphyrins are one class of molecules under intense investigation due to their photosensitizing ability for PDT application. Expanded porphyrins result from the expansion of the π electron conjugation by increasing the number of heterocyclic rings or bridging carbons of the existing porphyrin framework. These chromophores show strong absorptions in the red region (650-800 nm) compared to that of normal 18πporphyrins. The strong absorption of light by a water soluble nontoxic photosensitizing molecule in the therapeutic window resulting in maximum penetration of light into the tissues coupled with high singlet oxygen production will conceptualize an ideal photosensitizer. This review highlights various porphyrinoid sensitizers reported till date and their photosensitizing ability both in vitro and in vivo studies. Furthermore, the urgent need for developing ideal photosensitizer for PDT will also be highlighted.

Keywords:

Porphyrins, Photodynamic Therapy, hematoporphyrin, methylpheophobide, Picket fence porphyrins, 23-dichalcogenaporphyrin, Tin etiopurpurin (Sn Et2).



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Article Details

Volume: 2
Issue Number: 2
First Page: 187
Last Page: 207
Page Count: 21
DOI: 10.2174/1568011023354137
Price: $58
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