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MicroRNA-127-5p attenuates severe pneumonia via tumor necrosis factor receptor-associated factor 1.

Experimental and therapeutic medicine (2020-08-09)
Cunrong Chen, Sen Lin, Lili Zhou, Jingjing Wang, Junnian Chen, Ranjie Yu, Haoteng Luo, Junli Lu, Zhiqiang Xue, Mingzhi Chen
RESUMEN

Pneumonia is a persistent and pervasive disease, the effects of which can be severe. MicroRNA (miR)-127-5p has been utilized as a novel biomarker for the diagnosis of severe pneumonia. The present study aimed to investigate the function of miR-127-5p during severe pneumonia. An in vitro model of severe pneumonia in Ana-1 murine macrophages was established using lipopolysaccharide (LPS). Subsequently, reverse transcription-quantitative PCR and ELISA were performed to detect the mRNA and protein expression levels of interleukin (IL)-1β, IL-6 and tumor necrosis factor (TNF)-α. Western blotting was also performed to measure the activity of AKT and NF-κB. The results indicated that compared with the control group, LPS treatment increased TNF receptor-associated factor 1 (TRAF1) expression levels and reduced miR-127-5p expression levels. Furthermore, the results revealed that the 3'-untranslated region of TRAF1 was targeted by miR-127-5p. miR-127-5p mimic reduced LPS-induced increases in IL-1β, IL-6 and TNF-α expression by targeting TRAF1, which was potentially mediated by inactivation of the AKT and NF-κB signaling pathways. Collectively, the results demonstrated that miR-127-5p may attenuate severe pneumonia by reducing LPS-induced inflammatory cytokine production, and inactivating the AKT and NF-κB signaling pathways by targeting TRAF1.

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Sigma-Aldrich
Mouse IL-1 β ELISA Kit, for serum, plasma and cell culture supernatant
Sigma-Aldrich
Mouse IL-6 ELISA Kit, for serum, plasma and cell culture supernatant