Modulation of photosensitization processes for an improved targeted photodynamic therapy
Identifieur interne : 000779 ( Hal/Corpus ); précédent : 000778; suivant : 000780Modulation of photosensitization processes for an improved targeted photodynamic therapy
Auteurs : Marc Verhille ; Pierre Couleaud ; Régis Vanderesse ; Daniel Brault ; Muriel Barberi-Heyob ; Céline FrochotSource :
- Current Medicinal Chemistry [ 0929-8673 ] ; 2010-09-22.
Abstract
Photodynamic therapy (PDT) is a cancer treatment modality involving the combination of light, a photosensitizer (PS) and molecular oxygen, which results in the production of cytotoxic reactive oxygen species (ROS). Singlet oxygen (1O2) is one of the most important of these ROS. Because the lifetime and diffusion of 1O2 is very limited, a controllable singlet oxygen generation with high selectivity and localization would lead to more efficient and reliable PDT. The lack of selective accumulation of the PS‟s within tumour tissue is a major problem in PDT. Targeted PDT would offer the advantage to enhance photodynamic efficiency by directly targeting diseased cells or tissues. Many attempts have been made to either selectively deliver light to diseased tissues or increase the uptake of the photoactive compounds by the target cells. The review will survey the literature regarding the multi-level control of 1O2 production for PDT applications. The mechanisms of ROS formation are described. The different strategies leading to targeted formation of 1O2 are developed. Some activatable PDT agents have been based on energy transfer between PS‟s by control of the aggregation/disaggregation. The concept of molecular beacon based on quenching-dequenching upon protease cleavage is capable of precise control of 1O2 by responding to specific cancer-associated biomarkers.
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Hal:hal-00521040Le document en format XML
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<front><div type="abstract" xml:lang="en">Photodynamic therapy (PDT) is a cancer treatment modality involving the combination of light, a photosensitizer (PS) and molecular oxygen, which results in the production of cytotoxic reactive oxygen species (ROS). Singlet oxygen (1O2) is one of the most important of these ROS. Because the lifetime and diffusion of 1O2 is very limited, a controllable singlet oxygen generation with high selectivity and localization would lead to more efficient and reliable PDT. The lack of selective accumulation of the PS‟s within tumour tissue is a major problem in PDT. Targeted PDT would offer the advantage to enhance photodynamic efficiency by directly targeting diseased cells or tissues. Many attempts have been made to either selectively deliver light to diseased tissues or increase the uptake of the photoactive compounds by the target cells. The review will survey the literature regarding the multi-level control of 1O2 production for PDT applications. The mechanisms of ROS formation are described. The different strategies leading to targeted formation of 1O2 are developed. Some activatable PDT agents have been based on energy transfer between PS‟s by control of the aggregation/disaggregation. The concept of molecular beacon based on quenching-dequenching upon protease cleavage is capable of precise control of 1O2 by responding to specific cancer-associated biomarkers.</div>
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<author role="aut"><persName><forename type="first">Pierre</forename>
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<author role="aut"><persName><forename type="first">Régis</forename>
<surname>Vanderesse</surname>
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<author role="aut"><persName><forename type="first">Daniel</forename>
<surname>Brault</surname>
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<author role="aut"><persName><forename type="first">Muriel</forename>
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<author role="aut"><persName><forename type="first">Céline</forename>
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<editor role="depositor"><persName><forename>Didier</forename>
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<idno type="stamp" n="UPMC">Université Pierre et Marie Curie</idno>
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<idno type="stamp" n="INPL">Institut National Polytechnique de Lorraine</idno>
<idno type="stamp" n="UNIV-LORRAINE">Université de Lorraine</idno>
<idno type="stamp" n="INC-CNRS">Institut de Chimie du CNRS</idno>
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<abstract xml:lang="en">Photodynamic therapy (PDT) is a cancer treatment modality involving the combination of light, a photosensitizer (PS) and molecular oxygen, which results in the production of cytotoxic reactive oxygen species (ROS). Singlet oxygen (1O2) is one of the most important of these ROS. Because the lifetime and diffusion of 1O2 is very limited, a controllable singlet oxygen generation with high selectivity and localization would lead to more efficient and reliable PDT. The lack of selective accumulation of the PS‟s within tumour tissue is a major problem in PDT. Targeted PDT would offer the advantage to enhance photodynamic efficiency by directly targeting diseased cells or tissues. Many attempts have been made to either selectively deliver light to diseased tissues or increase the uptake of the photoactive compounds by the target cells. The review will survey the literature regarding the multi-level control of 1O2 production for PDT applications. The mechanisms of ROS formation are described. The different strategies leading to targeted formation of 1O2 are developed. Some activatable PDT agents have been based on energy transfer between PS‟s by control of the aggregation/disaggregation. The concept of molecular beacon based on quenching-dequenching upon protease cleavage is capable of precise control of 1O2 by responding to specific cancer-associated biomarkers.</abstract>
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