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Roles of microRNA-146a and microRNA-181b in regulating the secretion of tumor necrosis factor-α and interleukin-1β in silicon dioxide-induced NR8383 rat macrophages.

Zhang Y, Wang F, Lan Y, Zhou D, Ren X, Zhao L, Zhang Q - Mol Med Rep (2015)

Bottom Line: Analysis of variance and Student's two‑tailed t‑test were used to perform statistical analyses.The expression level of miR‑146a was significantly increased, while the expression level of miR‑181b was significantly decreased in the fibrotic lungs of the rats with silicosis, compared with the levels in the normal rats.By contrast, miR‑181b mimic transfection led to a significant reduction in the levels of TNF‑α (P<0.05), and miR‑146a mimics were responsible for the decrease in IL-1β (P<0.05).

View Article: PubMed Central - PubMed

Affiliation: Department of Occupational and Environmental Medicine, West China School of Public Health, Sichuan University, Chengdu, Sichuan 610041, P.R. China.

ABSTRACT
Despite increasing evidence to suggest that microRNA (miR)-146a and miR-181b are involved in the regulation of immune responses and tumor progression, their roles in silicosis remain to be fully elucidated. Therefore, the present study examined the roles of miR‑146a and miR‑181b in inflammatory responses, and their effect on the expression of the tumor necrosis factor‑α (TNF‑α) and interleukin‑1β (IL‑1β) inflammatory chemokines in silicon dioxide (SiO2)‑induced NR8383 rat macrophages. Alterations in the expression levels of miR‑146a and miR‑181b in rats with silicosis have been previously investigated using miRNA arrays. In the present study, the expression levels of miR‑146a and miR‑181b were assessed using reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR). The NR8383 cells were transfected with miRNA‑146a and miR‑181b mimics or inhibitors, and the cells and culture supernatants were collected following SiO2 treatment for 12 h. The expression levels of TNF‑α and IL‑1β were detected using western blotting, RT‑qPCR and ELISA. Analysis of variance and Student's two‑tailed t‑test were used to perform statistical analyses. The expression level of miR‑146a was significantly increased, while the expression level of miR‑181b was significantly decreased in the fibrotic lungs of the rats with silicosis, compared with the levels in the normal rats. It was observed that, following treatment of the NR8383 cells with SiO2 for 12 h, the levels of TNF‑α were significantly increased following miR‑181b knockdown and the levels of IL‑1β were significantly increased following miR‑146a knockdown, compared with the inhibitor‑treated controls (P<0.05). By contrast, miR‑181b mimic transfection led to a significant reduction in the levels of TNF‑α (P<0.05), and miR‑146a mimics were responsible for the decrease in IL-1β (P<0.05). The results of the present study provide evidence supporting the roles of miR‑146a and miR‑181b in the pathogenesis of silicosis, and suggest that they may be candidate therapeutic target in this disease.

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Protein expression levels of TNF-α and IL-1β. (A) Effects of overexpression of miR-146a or miR-181b on the expression of TNF-α. (B) Effects of knockdown of miR-146a or miR-181b on the expression of TNF-α. (C) Effects of overexpression of miR-146a or miR-181b on the expression of IL-1β. (D) Effects of knockdown of miR-146a or miR-181b on the expression of IL-1β. The error bars represent the mean ± standard deviation. *P<0.05, vs. miRNA mimic control group; **P<0.05, vs. miRNA inhibitor control group. TNF-α; tumor necrosis factor-α; IL-1β, interleukin; miR, microRNA.
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f3-mmr-12-04-5587: Protein expression levels of TNF-α and IL-1β. (A) Effects of overexpression of miR-146a or miR-181b on the expression of TNF-α. (B) Effects of knockdown of miR-146a or miR-181b on the expression of TNF-α. (C) Effects of overexpression of miR-146a or miR-181b on the expression of IL-1β. (D) Effects of knockdown of miR-146a or miR-181b on the expression of IL-1β. The error bars represent the mean ± standard deviation. *P<0.05, vs. miRNA mimic control group; **P<0.05, vs. miRNA inhibitor control group. TNF-α; tumor necrosis factor-α; IL-1β, interleukin; miR, microRNA.

Mentions: The results of the western blot analysis demonstrated that overexpression of miR-181b following SiO2 treatment for 12 h significantly reduced the protein levels of TNF-α, compared with the miRNA mimic control group (P<0.05; Fig. 3A). Subsequent to transfection with miR-181b inhibitors, followed by SiO2 treatment for 12 h, the protein levels of TNF-α were significantly upregulated (P<0.05; Fig. 3B). However, the miR-146a mimics or inhibitors had no significant effect on the protein expression levels of TNF-α. The NR8383 cells transfected with the miR-146a mimic exhibited lower expression levels of IL-1β in response to the subsequent SiO2 stimulation (P<0.05; Fig. 3C) and IL-1β was significantly upregulated in the NR8383 cells, which were transfected with the miR-146a or miR-181b inhibitors (P<0.05; Fig. 3D).


Roles of microRNA-146a and microRNA-181b in regulating the secretion of tumor necrosis factor-α and interleukin-1β in silicon dioxide-induced NR8383 rat macrophages.

Zhang Y, Wang F, Lan Y, Zhou D, Ren X, Zhao L, Zhang Q - Mol Med Rep (2015)

Protein expression levels of TNF-α and IL-1β. (A) Effects of overexpression of miR-146a or miR-181b on the expression of TNF-α. (B) Effects of knockdown of miR-146a or miR-181b on the expression of TNF-α. (C) Effects of overexpression of miR-146a or miR-181b on the expression of IL-1β. (D) Effects of knockdown of miR-146a or miR-181b on the expression of IL-1β. The error bars represent the mean ± standard deviation. *P<0.05, vs. miRNA mimic control group; **P<0.05, vs. miRNA inhibitor control group. TNF-α; tumor necrosis factor-α; IL-1β, interleukin; miR, microRNA.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4581828&req=5

f3-mmr-12-04-5587: Protein expression levels of TNF-α and IL-1β. (A) Effects of overexpression of miR-146a or miR-181b on the expression of TNF-α. (B) Effects of knockdown of miR-146a or miR-181b on the expression of TNF-α. (C) Effects of overexpression of miR-146a or miR-181b on the expression of IL-1β. (D) Effects of knockdown of miR-146a or miR-181b on the expression of IL-1β. The error bars represent the mean ± standard deviation. *P<0.05, vs. miRNA mimic control group; **P<0.05, vs. miRNA inhibitor control group. TNF-α; tumor necrosis factor-α; IL-1β, interleukin; miR, microRNA.
Mentions: The results of the western blot analysis demonstrated that overexpression of miR-181b following SiO2 treatment for 12 h significantly reduced the protein levels of TNF-α, compared with the miRNA mimic control group (P<0.05; Fig. 3A). Subsequent to transfection with miR-181b inhibitors, followed by SiO2 treatment for 12 h, the protein levels of TNF-α were significantly upregulated (P<0.05; Fig. 3B). However, the miR-146a mimics or inhibitors had no significant effect on the protein expression levels of TNF-α. The NR8383 cells transfected with the miR-146a mimic exhibited lower expression levels of IL-1β in response to the subsequent SiO2 stimulation (P<0.05; Fig. 3C) and IL-1β was significantly upregulated in the NR8383 cells, which were transfected with the miR-146a or miR-181b inhibitors (P<0.05; Fig. 3D).

Bottom Line: Analysis of variance and Student's two‑tailed t‑test were used to perform statistical analyses.The expression level of miR‑146a was significantly increased, while the expression level of miR‑181b was significantly decreased in the fibrotic lungs of the rats with silicosis, compared with the levels in the normal rats.By contrast, miR‑181b mimic transfection led to a significant reduction in the levels of TNF‑α (P<0.05), and miR‑146a mimics were responsible for the decrease in IL-1β (P<0.05).

View Article: PubMed Central - PubMed

Affiliation: Department of Occupational and Environmental Medicine, West China School of Public Health, Sichuan University, Chengdu, Sichuan 610041, P.R. China.

ABSTRACT
Despite increasing evidence to suggest that microRNA (miR)-146a and miR-181b are involved in the regulation of immune responses and tumor progression, their roles in silicosis remain to be fully elucidated. Therefore, the present study examined the roles of miR‑146a and miR‑181b in inflammatory responses, and their effect on the expression of the tumor necrosis factor‑α (TNF‑α) and interleukin‑1β (IL‑1β) inflammatory chemokines in silicon dioxide (SiO2)‑induced NR8383 rat macrophages. Alterations in the expression levels of miR‑146a and miR‑181b in rats with silicosis have been previously investigated using miRNA arrays. In the present study, the expression levels of miR‑146a and miR‑181b were assessed using reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR). The NR8383 cells were transfected with miRNA‑146a and miR‑181b mimics or inhibitors, and the cells and culture supernatants were collected following SiO2 treatment for 12 h. The expression levels of TNF‑α and IL‑1β were detected using western blotting, RT‑qPCR and ELISA. Analysis of variance and Student's two‑tailed t‑test were used to perform statistical analyses. The expression level of miR‑146a was significantly increased, while the expression level of miR‑181b was significantly decreased in the fibrotic lungs of the rats with silicosis, compared with the levels in the normal rats. It was observed that, following treatment of the NR8383 cells with SiO2 for 12 h, the levels of TNF‑α were significantly increased following miR‑181b knockdown and the levels of IL‑1β were significantly increased following miR‑146a knockdown, compared with the inhibitor‑treated controls (P<0.05). By contrast, miR‑181b mimic transfection led to a significant reduction in the levels of TNF‑α (P<0.05), and miR‑146a mimics were responsible for the decrease in IL-1β (P<0.05). The results of the present study provide evidence supporting the roles of miR‑146a and miR‑181b in the pathogenesis of silicosis, and suggest that they may be candidate therapeutic target in this disease.

Show MeSH
Related in: MedlinePlus