Oxidative stress levels are correlated with P15 and P16 gene promoter methylation in myelodysplastic syndrome patients.
Clin Exp Med
; 16(3): 333-43, 2016 Aug.
Article
em En
| MEDLINE
| ID: mdl-25982567
ABSTRACT
Oxidative stress and abnormal DNA methylation have been implicated in some types of cancer, namely in myelodysplastic syndromes (MDS). Since both mechanisms are observed in MDS patients, we analyzed the correlation of intracellular levels of peroxides, superoxide anion, and glutathione (GSH), as well as ratios of peroxides/GSH and superoxide/GSH, with the methylation status of P15 and P16 gene promoters in bone marrow leukocytes from MDS patients. Compared to controls, these patients had lower GSH content, higher peroxide levels, peroxides/GSH and superoxide/GSH ratios, as well as higher methylation frequency of P15 and P16 gene promoters. Moreover, patients with methylated P15 gene had higher oxidative stress levels than patients without methylation (peroxides 460 ± 42 MIF vs 229 ± 25 MIF, p = 0.001; superoxide 383 ± 48 MIF vs 243 ± 17 MIF, p = 0.022; peroxides/GSH 2.50 ± 0.08 vs 1.04 ± 0.34, p < 0.001; superoxide/GSH 1.76 ± 0.21 vs 1.31 ± 0.10, p = 0.007). Patients with methylated P16 and at least one methylated gene had higher peroxide levels as well as peroxides/GSH ratio than patients without methylation. Interestingly, oxidative stress levels allow the discrimination of patients without methylation from ones with methylated P15, methylated P16, or at least one methylated (P15 or P16) promoter. Taken together, these findings support the hypothesis that oxidative stress is correlated with P15 and P16 hypermethylation.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Temas:
Geral
Base de dados:
MEDLINE
Assunto principal:
Síndromes Mielodisplásicas
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Regiões Promotoras Genéticas
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Estresse Oxidativo
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Metilação de DNA
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Inibidor p16 de Quinase Dependente de Ciclina
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Inibidor de Quinase Dependente de Ciclina p15
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Leucócitos
Limite:
Adult
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Aged
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Aged80
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Clin Exp Med
Assunto da revista:
MEDICINA
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Portugal