Received:09 October 2020,
Published:30 March 2021
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Juanjuan MEI, Man TIAN, Shasha YAN, et al. Respiratory syncytial virus promotes apoptosis and expression of inflammatory factors in bronchial epithelial cells by regulating miR-409-3p/SIRT1 pathway[J]. Journal of Third Military Medical University, 2021, 43(6): 503-511.
Juanjuan MEI, Man TIAN, Shasha YAN, et al. Respiratory syncytial virus promotes apoptosis and expression of inflammatory factors in bronchial epithelial cells by regulating miR-409-3p/SIRT1 pathway[J]. Journal of Third Military Medical University, 2021, 43(6): 503-511. DOI: 10.16016/j.1000-5404.202010016.
Objective
2
To explore the effect of respiratory syncytial virus (RSV) on the apoptosis and the expression of inflammatory factors in human bronchial epithelial cells (HBECs)
and investigate its possible mechanisms.
Methods
2
In vitro
cultured HBECs were transfected with miR-409-3p inhibitor
overexpression vector of silent information regulator 1 (SIRT1) along
or co-transfected with miR-409-3p inhibitor and SIRT1 small interfering RNA (siRNA)
respect
ively. After RSV infection
RT-qPCR was used to detect the expression levels of miR-409-3p and SIRT1 in the transfected cells. Cell counting kit-8 (CCK-8) assay and flow cytometry were performed to determine cell proliferation as well as cell apoptosis. Western blotting was also adopted to verify the expression of Ki-67
p21
Bcl-2 and Bax. In addition
corresponding reagent testing kits were used to detect the contents of IL-6 and TNF-α in culture supernatant. Finally
the regulatory relationship between SIRT1 and miR-409-3p was verified by the dual luciferase reporter assay.
Results
2
RSV infection promoted the expression of miR-409-3p (
P
<
0.05)
inhibited that of SIRT1 (
P
<
0.05)
decreased cell proliferation and protein expression of Ki-67 and Bcl2 (
P
<
0.05)
and promoted cell apoptosis and protein expression of p21 and Bax and contents of IL-6 and TNF-α (
P
<
0.05) in HBECs cells. Silencing miR-409-3p or overexpressing SIRT1 resulted in the enhanced the proliferation activity and the protein expression of Ki-67 and Bcl2 in RSV-infected HBECs cells (
P
<
0.05)
but decreased apoptotic rate
protein expression of p21 and Bax
and contents of IL-6 and TNF-α (
P
<
0.05). miR-409-3p showed a negatively targeted regulation to SIRT1 expression. Silencing SIRT1 reversed the effects of silenced miR-409-3p on the proliferation and apoptosis of RSV-infected HBECs as well as on the expression of inflammatory factors IL-6 and TNF-α (
P
<
0.05).
Conclusion
2
RSV promotes the apoptosis and the expression of inflammatory factors in bronchial epithelial cells by regulating miR-409-3p/SIRT1 pathway.
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