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Molecular mechanism of drug photosensitization: VIII. Effect of inorganic ions on membrane damage photosensitized by naproxen.

Abstract：

:The inhibitory effect of Cu2+, Mn2+, Co2+, and I- on naproxen-induced photohemolysis was investigated. In order to better understand this effect, these ions were also tested for lipid peroxidation and protein crosslinking, which are among the main processes involved in erythrocyte membrane damage. The overall results support the hypothesis that metal cations act via a redox scavenging of the radicals which are produced on the lipid component of the membrane. This process occurs through hydrogen abstraction operated by photogenerated naproxen radicals. Moreover, copper can also act as a superoxide anion scavenger: its decay is noxious in photohemolysis, whereas it is not in lipid peroxidation. Metal cations, besides, are not able to scavenge protein crosslinking. On the other hand, iodide is able to reduce both processes because it acts as a heavy atom, favoring intersystem crossing to the unreactive triplet state of the drug, thus reducing naproxen photolysis and, as a consequence, the amount of the damaging species produced. This mechanism was supported by luminescence experiments performed in the absence and in the presence of iodide.

journal_name

J Inorg Biochem

journal_title

Journal of inorganic biochemistry

authors

Giuffrida S,De Guidi G,Miano P,Sortino S,Condorelli G,Costanzo LL

doi

10.1016/0162-0134(95)00226-x

subject

Has Abstract

pub_date

1996-09-01 00:00:00

pages

253-63

issue

4

eissn

0162-0134

issn

1873-3344

pii

016201349500226X

journal_volume

63

pub_type

杂志文章

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