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Background: Acute lung injury (ALI) is a severe disease of respiratory system, which one of the most common causes is sepsis induction. Cell apoptosis and inflammation contribute to the progression of ALI and lncRNAs play crucial roles in ALI. Hence, this study is to unearth the specific mechanism of NEAT1.Methods: BEAS-2B cells was exposed to lipopolysaccharide (LPS) to construct cell model of sepsis-induced ALI. The gene and protein expression were evaluated using qRT-PCR and western blot. Cell viability was determined by CCK-8. Cell apoptosis was detected utilizing flow cytometry. The secretion of inflammatory factors was assessed using ELISA. The interconnections among NEAT1, miR-26a-5p and ROCK1 were validated using starbase, luciferase assay and RIP.Results: LPS treatment elevated NEAT1 and ROCK1 levels while reduced miR-26a-5p level in BEAS-2B cells. Besides, LPS treatment augmented cell apoptosis and enhanced inflammatory cytokine secretion, whereas NEAT1 silencing could reversed LPS-mediated these influences in BEAS-2B cells. Mechanistically, NEAT1 positively mediated ROCK1 expression through targeting miR-26a-5p. Moreover, miR-26a-5p inhibitor offset NEAT1 depletion-mediated suppressive influences on cell apoptosis and inflammation. ROCK1 upregulation attenuated the inhibitory impacts generated by miR-26a-5p overexpression on cell apoptosis and inflammation. Conclusion: Our results revealed NEAT1 could reinforce LPS-induced cell apoptosis and inflammatory response through repressing miR-26a-5p/ROCK1 axis, thereby aggravating ALI caused by sepsis. Our data suggested NEAT1, miR-26a-5p and ROCK1 might be biomarkers and targets genes for alleviating sepsis-induced ALI.

In recent years, the development of adjunctive therapeutic hyperthermia for cancer therapy has received considerable attention. However, the mechanisms underlying hyperthermia resistance are still poorly understood. In this study, we investigated the roles of cold-inducible RNA binding protein (Cirbp) in regulating hyperthermia resistance and underlying mechanisms in nasopharyngeal carcinoma (NPC). Our results firstly revealed that hyperthermia significantly attenuated the stemness property of NPC cells, while combination treatment of hyperthermia and oridonin dramatically increased the killing effect on NPC cells and cancer stem cell (CSC)-like population. Moreover, hyperthermia substantially improved the sensitivity of radiation-resistant NPC cells and CSC-like cells to radiotherapy. Hyperthermia noticeably suppressed Cirbp expression in NPC cells and xenograft tumor tissues. Furthermore, Cirbp inhibition remarkably boosted anti-tumor-killing activity of hyperthermia against NPC cells and CSC-like cells, whereas ectopic expression of Cirbp compromised tumor-killing effect of hyperthermia on these cells, indicating that Cirbp overexpression induces hyperthermia resistance. ThermomiR-377–3p improved the sensitivity of NPC cells and cancer stem-like cells to hyperthermia in vitro by directly suppressing Cirbp expression. More importantly, our results displayed the significantly boosted sensitization of tumor xenografts to hyperthermia by Cirbp silencing in vivo, but ectopic expression of Cirbp nearly completely counteracted hyperthermia-mediated tumor cell-killing effect against tumor xenografts in vivo. Mechanistically, Cirbp silencing-induced inhibition of DNA damage repair by inactivating ATM-Chk2 and ATR-Chk1 pathways, decrease in stemness and increase in cell death contributed to hyperthermic sensitization; conversely, Cirbp overexpression-induced promotion of DNA damage repair, increase in stemness and decrease in cell apoptosis contributed to hyperthermia resistance. Taken together, these findings reveal a previously unrecognized role for Cirbp in positively regulating hyperthermia resistance and suggest that thermomiR-377–3p and its target gene Cirbp represent promising targets for therapeutic hyperthermia.