Photophysical Properties and Photobiological Behavior of Amodiaquine, Primaquine and Chloroquine

This article describes the results of a coupled photophysical and photobiological study aimed at understanding the phototoxicity mechanism of the antimalarial drugs amodiaquine (AQ), primaquine (PQ) and chloroquine (CQ). Photophysical experiments were carried out in aqueous solutions by steady‐state...

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Veröffentlicht in:Photochemistry and photobiology 2007-11, Vol.83 (6), p.1415-1427
Hauptverfasser: Viola, Giampietro, Salvador, Alessia, Cecconet, Laura, Basso, Giuseppe, Vedaldi, Daniela, Dall'Acqua, Francesco, Aloisi, Gian Gaetano, Amelia, Matteo, Barbafina, Arianna, Latterini, Loredana, Elisei, Fausto
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container_issue 6
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container_title Photochemistry and photobiology
container_volume 83
creator Viola, Giampietro
Salvador, Alessia
Cecconet, Laura
Basso, Giuseppe
Vedaldi, Daniela
Dall'Acqua, Francesco
Aloisi, Gian Gaetano
Amelia, Matteo
Barbafina, Arianna
Latterini, Loredana
Elisei, Fausto
description This article describes the results of a coupled photophysical and photobiological study aimed at understanding the phototoxicity mechanism of the antimalarial drugs amodiaquine (AQ), primaquine (PQ) and chloroquine (CQ). Photophysical experiments were carried out in aqueous solutions by steady‐state and time‐resolved spectrometric techniques to obtain information on the different decay pathways of the excited states of the drugs and on the transient species formed upon laser irradiation. The results showed that all three drugs possess very low fluorescence quantum yields (10−2–10−4). Laser flash photolysis experiments proved the occurrence of photoionization processes leading to the formation of a radical cation in all three systems. In the case of AQ the lowest triplet state was also detected. Together with the photophysical properties the photobiological properties of the antimalarial drugs were investigated under UV irradiation, on various biological targets through a series of in vitro assays. Phototoxicity on mouse 3T3 fibroblast and human keratinocyte cell lines NCTC‐2544 was detected for PQ and CQ but not for AQ. In particular, PQ‐ and CQ‐induced apoptosis was revealed by the externalization of phosphatidylserine. Furthermore, upon UV irradiation, the drugs caused significant variations of the mitochondrial potential (Δψmt) measured by flow cytometry. The photodamages produced by the drugs were also evaluated on proteins, lipids and DNA. The combined approaches were useful in understanding the mechanism of phototoxicity induced by these antimalarial drugs.
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Photophysical experiments were carried out in aqueous solutions by steady‐state and time‐resolved spectrometric techniques to obtain information on the different decay pathways of the excited states of the drugs and on the transient species formed upon laser irradiation. The results showed that all three drugs possess very low fluorescence quantum yields (10−2–10−4). Laser flash photolysis experiments proved the occurrence of photoionization processes leading to the formation of a radical cation in all three systems. In the case of AQ the lowest triplet state was also detected. Together with the photophysical properties the photobiological properties of the antimalarial drugs were investigated under UV irradiation, on various biological targets through a series of in vitro assays. Phototoxicity on mouse 3T3 fibroblast and human keratinocyte cell lines NCTC‐2544 was detected for PQ and CQ but not for AQ. 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subjects Amodiaquine - chemistry
Amodiaquine - toxicity
Animals
Antimalarials
Apoptosis
Blindness
Cell Line
Cell Survival - drug effects
Cell Survival - radiation effects
Chloroquine - chemistry
Chloroquine - toxicity
DNA - genetics
DNA Damage
Drugs
Free radicals
Humans
Lipid Peroxidation - drug effects
Lipid Peroxidation - radiation effects
Lysosomes - drug effects
Lysosomes - radiation effects
Mice
Mitochondria - drug effects
Mitochondria - radiation effects
Molecular Structure
Photobiology
Photochemistry
Primaquine - chemistry
Primaquine - toxicity
Reactive Oxygen Species - metabolism
Salmon
Spectrophotometry
title Photophysical Properties and Photobiological Behavior of Amodiaquine, Primaquine and Chloroquine
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