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1 August 2001 The Role of the Peripheral Benzodiazepine Receptor in the Apoptotic Response to Photodynamic Therapy
David Kessel, Michael Antolovich, Kevin M. Smith
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Abstract

Several previous studies have suggested that the peripheral benzodiazepine receptor (PBR) on the mitochondrial surface was an important target for photodynamic therapy (PDT). In this study we compared PBR affinity vs photodynamic efficacy of protoporphyrin-IX (PP-IX) and two structural analogs, PP-III and PP-XIII, using murine leukemia L1210 cells in culture. The results indicate that the three agents have approximately equal hydrophobicity, affinity for L1210 cells and ability to initiate photodamage leading to an apoptotic response. But only PP-IX had significant affinity for the PBR. These data indicate that the relationship between PDT efficacy and PBR affinity may hold only for sensitizers with the PP-IX configuration.

David Kessel, Michael Antolovich, and Kevin M. Smith "The Role of the Peripheral Benzodiazepine Receptor in the Apoptotic Response to Photodynamic Therapy," Photochemistry and Photobiology 74(2), 346-349, (1 August 2001). https://doi.org/10.1562/0031-8655(2001)074<0346:TROTPB>2.0.CO;2
Received: 16 January 2001; Accepted: 1 May 2001; Published: 1 August 2001
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