Abstract
Background
The miRNA profile is changed after burn or sepsis and is involved in regulating inflammatory reactions. However, the function and molecular mechanism of miRNAs in regulating burn sepsis-induced acute kidney injury (AKI) are still unclear.
Methods
In this study, animal and cell sepsis models were established after burned rats were injected with lipopolysaccharide (LPS) or NRK-52E cells treated with LPS, respectively. Cytokine expression, inflammatory cell infiltration, serum creatinine (Scr) and kidney injury molecule-1 (KIM-1) levels were analysed after the indicated treatments.
Results
Burn sepsis increased the expression of inflammatory factors (TNF-α and IL-1β) and chemokines (MIP-1α, MIP-2 and MCP-1). Moreover, burn sepsis promoted macrophage and neutrophil infiltration into the kidney and upregulated the levels of Scr and KIM-1 in the kidney and urine. Ectopic expression of miR-181c significantly reduced LPS-induced TLR4 protein expression, suppressed KIM-1 mRNA levels and subsequently inhibited the activation of inflammatory genes (TNF-α and IL-1β) and chemokine genes (MIP-1α, MIP-2 and MCP-1).
Conclusions
Our results demonstrated that miR-181c could suppress TLR4 expression, reduce inflammatory factor and chemokine secretion, mitigate inflammatory cell infiltration into the kidney and downregulate KIM-1 expression, which might ultimately attenuate burn sepsis-induced AKI.
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Funding
This work was supported by the Beijing Nova Program (Z181100006218043), the National Natural Science foundation of China (81772067) and the Beijing Natural Science Foundation (7172210).
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YHY, XL, JJZ and JKC conceived the study; YHY and XL performed the experiments; YHY, XL, SFH, JW, JJZ and JKC analyzed the data; YHY and JJZ wrote the manuscript; JJZ and JKC approved the manuscript.
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All procedures for animal model had been approved, and the approval number was PONY-2020-FL-43.
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Yu, Y., Li, X., Han, S. et al. miR-181c, a potential mediator for acute kidney injury in a burn rat model with following sepsis. Eur J Trauma Emerg Surg 49, 1035–1045 (2023). https://doi.org/10.1007/s00068-022-02124-5
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DOI: https://doi.org/10.1007/s00068-022-02124-5