Objective To investigate the role of delta/notch-like epidermal growth factor-related receptor(DNER)in gastric cancer and its regulatory mechanism.Methods The mRNA and protein levels of DNER in gastric cancer tissues and cells were detected with quantitative real time polymerase chain reaction(qRT-PCR)and Western blot.Gastric cancer cell line SGC7901 with silenced DNER expression was constructed,and cells were treated with mitochondrial dynamin-related protein 1(DRP1)inhibitor Mdivi-1.CCK-8 assay,Transwell assay,and flow cytometry were used to detect cell viability,invasion ability and apoptosis,respectively.Western blot was used to detect DNER protein levels,apoptosis-associated proteins[Cysteinyl aspartate-specific proteinase-3(Caspase-3),Bcl-2 Associated X(Bax)],autophagy associated proteins[microtubule-associated protein 1 light chain 3-Ⅱ/Ⅰ,LC3 Ⅱ/Ⅰ),p62,PTEN induced putative kinase 1(PINK1)and Parkin],and mitochondrial fission and fusion protein[DRP1,mitochondrial fission factor(MFF),mitochondrial fission protein 1(FIS1),Optic Atrophy 1(OPA1),mitofusin 1(MFN1)and MFN2]levels.Results The expression levels of DNER mRNA and protein in gastric cancer tissues were higher than those in adjacent normal tissues(t=-52.485,-46.955),while expression levels of DNER mRNA and protein in gastric cancer cells were higher than those in normal gastric epithelial cells(F=60.551,60.652),and the differences were significant(P＜0.001).Silencing DNER inhibited the proliferation and invasion of SGC7901 cells,induced apoptosis,and increased the expression of apoptosis-related proteins,with significant differences(t=8.026～25.903,all P＜0.05).Silenced DNER increased LC3 Ⅱ/Ⅰ ratio(t=18.086),decreased p62 protein level(t=6.747),promoted the aggregation of PINK1 and Parkin proteins in mitochondria(t=15.630,18.171),inhibited the expression of mitochondrial fusion proteins OPA1,MFN1 and MFN2(t=12.835,8.963,9.732),and promoted the expression of mitochondrial fission proteins DRP1,MFF and FIS1(t=16.034,16.939,15.971),with significant differences(all P＜0.05).Mdivi-1 treatment could counteract the effects of silencing DNER on mitochondrial autophagy,proliferation,invasion and apoptosis of gastric cancer cells.Conclusion DNER can reduce mitochondrial autophagy by inhibiting mitochondrial dynamic imbalance,promote cell proliferation and invasion,and inhibit cell apoptosis,thus promoting the progression of gastric cancer.
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