Knockdown of LINC01128 Downregulates FUT8 to Inhibit OxLDL-Induced Vascular Smooth Muscle Cell Apoptosis in Atherosclerosis.

BACKGROUND: The apoptosis of vascular smooth muscle cells (VSMCs) contributes to the progression of atherosclerosis (AS). Long intergenic non-protein coding RNA 1128 (LINC01128) has been implicated in AS, and this study aims to uncover the role and mechanism of LINC01128 in regulating oxidized low-density lipoprotein (oxLDL)-induced VSMCs.

METHODS: The position of LINC01128 in cells and its target genes were predicted using bioinformatics. The localization of LINC01128 in human VSMCs was determined through fluorescence in situ hybridization. VSMCs were transfected, and the interaction between LINC01128 and fucosyltransferase 8 (FUT8) was validated by chromatin immunoprecipitation assay. The apoptotic VSMC model was established using oxLDL. LINC01128 expression in VSMCs was analyzed by quantitative real-time polymerase chain reaction (qRT-PCR), and FUT8 expression was detected by qRT-PCR and western blot. VSMC viability, migration, invasion abilities, and apoptosis were assessed using cell counting kit-8, transwell assay, and flow cytometry, respectively.

RESULTS: OxLDL (200 μg/mL) upregulated the expression of LINC01128 and FUT8 mRNA, as well as FUT8 protein, in VSMCs. LINC01128 was expressed in the nucleus of VSMCs and bound to FUT8. Knockdown of LINC01128 alleviated the inhibitory effects of oxLDL (200 μg/mL) on viability, migration, and invasion, and mitigated the promotion of apoptosis and FUT8 expression in VSMCs. On the other hand, FUT8 overexpression enhanced the suppressive effects of oxLDL (200 μg/mL) on viability, migration, and invasion activities, and amplified the facilitating effect of oxLDL on apoptosis in VSMCs. Moreover, FUT8 overexpression reversed the impact of LINC01128 silencing on viability, migration, invasion, and apoptosis in oxLDL-stimulated VSMCs.

CONCLUSION: The knockdown of LINC01128 downregulates FUT8, inhibiting the progression of VSMCs in AS.