A functional polymorphism at the miR4915p binding site in the 3'untranslated region of the MMP9 gene increases the risk of developing ventilatorassociated pneumonia.
Int J Mol Med
; 48(6)2021 12.
Article
en En
| MEDLINE
| ID: mdl-34664683
ABSTRACT
Matrix metalloproteinase (MMP)9 is associated with the severity of ventilatorassociated pneumonia (VAP), while an rs1056629 SNP located in the 3'untranslated region (UTR) of MMP9 affects the microRNA (miRNA/miR)491mediated regulation of MMP9 expression. In the present study, the effect of rs1056629 on the development of VAP in patients with chronic obstructive pulmonary disease (COPD) was investigated. Patients with COPD were enrolled in the study and their genotypes of rs1056629 (CC, CA or AA) were determined. ELISA was used to analyze the levels of TNFα and IL6 in the monocytes of patients with COPD carrying differential genotypes of rs1056629. Reverse transcriptionquantitative PCR was carried out to evaluate the expression of miR491 and MMP9 mRNA in the different groups of patients with COPD. Luciferase assay was used to confirm the inhibitory role of miR491 in MMP9 expression. Western blot analysis was carried out to assess the expression of MMP9 protein in A549 and H1299 cells transfected with miR491 mimics. The risk and severity of VAP were significantly elevated in patients with COPD carrying the CC and AC genotypes of rs1056629. Although there was no difference in the expression of miR491 in patients carrying different genotypes of rs1056629, the expression levels of TNFα, IL6 and MMP9 were increased in patients with COPD carrying the CC and AC genotypes of rs1056629. The results of luciferase assay revealed that miR491 inhibited the expression of MMP9 through direct binding to the 3'UTR of MMP9. Transfection of miR491 mimics into A549 and H1299 cells markedly suppressed the expression of MMP9 in a concentrationdependent manner. On the whole, the findings of the present study confirm that the CC and AC genotypes of rs1056629 increase the risk of developing VAP in patients with COPD by increasing the expression of MMP9.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Metaloproteinasa 9 de la Matriz
/
Polimorfismo de Nucleótido Simple
/
Enfermedad Pulmonar Obstructiva Crónica
/
MicroARNs
/
Neumonía Asociada al Ventilador
Tipo de estudio:
Etiology_studies
/
Risk_factors_studies
Límite:
Humans
Idioma:
En
Revista:
Int J Mol Med
Asunto de la revista:
BIOLOGIA MOLECULAR
/
GENETICA MEDICA
Año:
2021
Tipo del documento:
Article