Nitric oxide release from the S-nitrosothiol zinc phthalocyanine complex by flash photolysis

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorLunardi, Claure Nain-
Autor(es): dc.creatorRotta, Jeane Cristina Gomes-
Autor(es): dc.creatorTedesco, Antonio Claudio-
Data de aceite: dc.date.accessioned2021-10-14T17:54:40Z-
Data de disponibilização: dc.date.available2021-10-14T17:54:40Z-
Data de envio: dc.date.issued2012-11-30-
Data de envio: dc.date.issued2012-11-30-
Data de envio: dc.date.issued2003-05-
Fonte completa do material: dc.identifierhttp://repositorio.unb.br/handle/10482/11720-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1590/S0100-879X2003000500005-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/619076-
Descrição: dc.descriptionThe photogeneration of nitric oxide (NO) using laser flash photolysis was investigated for S-nitroso-glutathione (GSNO) and S-nitroso-N-acetylcysteine (NacySNO) at pH 6.4 (PBS/HCl) and 7.4 (PBS). Irradiation of S-nitrosothiol with light ( = 355 nm followed by absorption spectroscopy) resulted in the homolytic decomposition of NacySNO and GSNO to generate radicals (GS• and NacyS•) and NO. The release of NO from donor compounds measured with an ISO-Nometer apparatus was larger at pH 7.4 than pH 6.4. NacySNO was also incorporated into dipalmitoyl-phosphatidylcholine liposomes in the presence and absence of zinc phthalocyanine (ZnPC), a well-known photosensitizer useful for photodynamic therapy. Liposomes are usually used as carriers for hydrophobic compounds such as ZnPC. Inclusion of ZnPC resulted in a decrease in NO liberation in liposomal medium. However, there was a synergistic action of both photosensitizers and S-nitrosothiols resulting in the formation of other reactive species such as peroxynitrite, which is a potent oxidizing agent. These data show that NO release depends on pH and the medium, as well as on the laser energy applied to the system. Changes in the absorption spectrum were monitored as a function of light exposure.-
Formato: dc.formatapplication/pdf-
Publicador: dc.publisherAssociação Brasileira de Divulgação Científica-
Direitos: dc.rightsAcesso Aberto-
Direitos: dc.rightsBrazilian Journal of Medical and Biological Research - Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons (Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)). Fonte:http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-879X&lng=pt&nrm=iso. Acesso em: 8 nov. 2012.-
Palavras-chave: dc.subjectÓxido nítrico-
Palavras-chave: dc.subjectTerapia fotodinâmica-
Palavras-chave: dc.subjectRaios laser-
Título: dc.titleNitric oxide release from the S-nitrosothiol zinc phthalocyanine complex by flash photolysis-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional – UNB

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