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Published on: November 3, 2014
microRNA-196b alleviates lipopolysaccharide-induced inflammatory injury by targeting NRAS
Nuoer Chen1, Bin Ma1, Shuai Guo1
1Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, People's Republic of China.
Abstract:
Bovine endometritis is a serious hazard to husbandry, so it is necessary to know the mechanism of endometritis. In past research, we found microRNAs (miRNAs) might be regulators in inflammation, including miR-196b, but the mechanism of miR-196b in bovine endometritis was unknown. Therefore, we tended to find out what role miR-196b would play in bovine endometritis. As a result, we found miR-196b up-regulated in the endometritis tissue and the high concentration lipopolysaccharide (LPS)-stimulated bovine endometrial epithelial (BEND) cell line, but down-regulated in the low concentration. And, over-expression of miR-196b inhibited the expressions of some inflammatory factors, such as tumor necrosis factor-alpha (TNF-α), interleukin-1β (IL-1β), interleukin-6 (IL-6), and neuroblastoma RAS (NRAS)/nuclear factor (NF)-κB pathway proteins. Furthermore, the dual-luciferase reporter assay and NRAS knockdown confirmed that miR-196b inhibited activation of the downstream pathway by directly targeting NRAS. In conclusion, we provide evidence that miR-196b alleviates LPS-induced inflammatory injury by targeting NRAS.
Insights
MicroRNA-196b (miR-196b) plays a key role in bovine endometritis. This study shows miR-196b alleviates inflammation by targeting NRAS, offering insights into bovine reproductive health.
Area of Science:
- Veterinary Medicine
- Molecular Biology
- Immunology
Background:
- Bovine endometritis poses significant threats to livestock farming.
- MicroRNAs (miRNAs) are implicated in inflammatory processes, but miR-196b's role in bovine endometritis remains unclear.
Purpose of the Study:
- To investigate the function of miR-196b in bovine endometritis.
- To elucidate the molecular mechanism underlying miR-196b's action in inflammation.
Main Methods:
- Analysis of miR-196b expression in bovine endometritis tissues and lipopolysaccharide (LPS)-stimulated cells.
- Over-expression of miR-196b and assessment of inflammatory factor expression.
- Dual-luciferase reporter assay and NRAS knockdown to confirm direct targeting.
Main Results:
- miR-196b expression was upregulated in endometritis tissues and high LPS concentrations, but downregulated at low LPS concentrations.
- Overexpression of miR-196b suppressed key inflammatory factors (TNF-α, IL-1β, IL-6) and the NRAS/NF-κB pathway.
- miR-196b was confirmed to directly target NRAS, inhibiting downstream pathway activation.
Conclusions:
- miR-196b acts as a protective factor against LPS-induced inflammatory injury in bovine endometritis.
- Targeting NRAS is the mechanism by which miR-196b exerts its anti-inflammatory effects.
