Overexpression of long non-coding RNA TUG1 alleviates TNF-α-induced inflammatory injury in interstitial cells of Cajal.
EUROPEAN REVIEW FOR MEDICAL AND PHARMACOLOGICAL SCIENCES 2019;
23:312-320. [PMID:
30657572 DOI:
10.26355/eurrev_201901_16778]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE
Irritable bowel syndrome (IBS) is a common functional disorder in the gastrointestinal tract. Inflammatory response has been found to participate in the pathogenesis of IBS. This study aimed to explore the effects of long non-coding RNA taurine upregulated gene 1 (TUG1) on tumor necrosis factor alpha (TNF-α)-induced interstitial cells of Cajal (ICC) inflammatory injury, which was relevant to the pathogenesis of IBS.
PATIENTS AND METHODS
The expression levels of TUG1 and microRNA-127 (miR-127) were analyzed by qRT-PCR. Viability, apoptosis and the expression of apoptosis-associated factors were analyzed by CCK-8 assay, flow cytometry and Western blot, respectively. The mRNA and protein levels of pro-inflammatory cytokines were detected by qRT-PCR and Western blot, respectively. Finally, activations of nuclear factor kappa-B (NF-κB) and Notch pathways were evaluated by Western blot.
RESULTS
TNF-α treatment inhibited ICC viability, induced ICC apoptosis and promoted an inflammatory response in ICC. TUG1 was downregulated in TNF-α-treated ICC. TUG1 overexpression protected ICC from TNF-α-induced apoptosis and pro-inflammatory cytokines expression. TUG1 suppression showed opposite effects. MiR-127 was negatively regulated by TUG1 and implicated in the action of TUG1 in ICC. MiR-127 up-regulation largely reversed the effects of TUG1 on TNF-α-treated ICC. Mechanistically, TUG1 inhibited TNF-α-induced activation of NF-κB and Notch pathways in ICC by down-regulating miR-127.
CONCLUSIONS
TUG1 attenuated TNF-α-caused apoptosis and inflammatory response in ICC by down-regulating miR-127 and then inactivating NF-κB and Notch pathways.
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