p53 Signaling Pathway Polymorphisms Associated With Emphysematous Changes in Patients With COPD.
Chest
; 152(1): 58-69, 2017 07.
Article
em En
| MEDLINE
| ID: mdl-28315337
ABSTRACT
BACKGROUND:
The p53 signaling pathway may be important for the pathogenesis of emphysematous changes in the lungs of smokers. Polymorphism of p53 at codon 72 is known to affect apoptotic effector proteins, and the polymorphism of mouse double minute 2 homolog (MDM2) single nucleotide polymorphism (SNP)309 is known to increase MDM2 expression. The aim of this study was to assess polymorphisms of the p53 and MDM2 genes in smokers and confirm the role of SNPs in these genes in the pathogenesis of pulmonary emphysema.METHODS:
This study included 365 patients with a smoking history, and the polymorphisms of p53 and MDM2 genes were identified. The degree of pulmonary emphysema was determined by means of CT scanning. SNPs, MDM2 mRNA, and p53 protein levels were assessed in human lung tissues from smokers. Plasmids encoding p53 and MDM2 SNPs were used to transfect human lung fibroblasts (HLFs) with or without cigarette smoke extract (CSE), and the effects on cell proliferation and MDM2 promoter activity were measured.RESULTS:
The polymorphisms of the p53 and MDM2 genes were associated with emphysematous changes in the lung and were also associated with p53 protein and MDM2 mRNA expression in the lung tissue samples. Transfection with a p53 gene-coding plasmid regulated HLF proliferation, and the analysis of P2 promoter activity in MDM2 SNP309-coding HLFs showed the promoter activity was altered by CSE.CONCLUSIONS:
Our data demonstrated that p53 and MDM2 gene polymorphisms are associated with apoptotic signaling and smoking-related emphysematous changes in lungs from smokers.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Fumar
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Proteína Supressora de Tumor p53
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Doença Pulmonar Obstrutiva Crônica
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Enfisema
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Proteínas Proto-Oncogênicas c-mdm2
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article