Photodynamic inactivation for in vitro decontamination of Staphylococcus aureus in whole blood.
Photodiagnosis Photodyn Ther
; 28: 58-64, 2019 Dec.
Article
em En
| MEDLINE
| ID: mdl-31412273
ABSTRACT
BACKGROUND:
Blood can be the target of microbial cells in the human body. Erythrocytes, platelets, and plasma concentrates in blood bags used in hemotherapy for blood transfusion are contamination targets, which can trigger serious diseases in blood. These infections can cause septicemia that can lead to death if not recognized rapidly and treated adequately. The aim of this study was to evaluate the photodynamic inactivation in the in vitro decontamination of Staphylococcus aureus in whole blood, erythrocytes and platelet-rich plasma.METHODS:
Photodynamic inactivation using light doses of 10, 15 and 30â¯J/cm2 at 630â¯nm and an hematoporphyrin-derivative photosensitizer (Photogem®) solutions at 25 and 50⯵g/mL were evaluated. Toxicity of treatment was determined by hemolysis and cell viability assays.RESULTS:
The S. aureus reduction in phosphate buffered saline (PBS), whole blood, erythrocytes and platelet-rich plasma at 15â¯J/cm2 and 50⯵g/mL were 7.2, 1.0, 1.3 and 0.4 log CFU/mL, respectively. Quantitative and qualitative analyses were performed in whole blood samples, and Photogem® showed a low risk of hemolysis (10.7%) in whole blood. However, 100% of erythrocytes suffered hemolysis in the absence of plasma. The cell viability assay showed 13.9% of apoptosis in erythrocytes, but normal platelet viability.CONCLUSION:
S. aureus inactivation of whole blood samples using 50⯵g/mL Photogem® and 15â¯J/cm2 resulted in better outcomes, providing promising indications for treatment of bacterial contamination of blood, and in this work, alternative possibilities to apply the technique for blood decontamination are discussed.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fotoquimioterapia
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Staphylococcus aureus
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Descontaminação
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Bacteriemia
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Fármacos Fotossensibilizantes
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Patógenos Transmitidos pelo Sangue
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Hematoporfirinas
Tipo de estudo:
Qualitative_research
Limite:
Humans
Idioma:
En
Revista:
Photodiagnosis Photodyn Ther
Assunto da revista:
DIAGNOSTICO POR IMAGEM
/
TERAPEUTICA
Ano de publicação:
2019
Tipo de documento:
Article