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연세대학교 의과대학 Yonsei Medical Journal Yonsei Medical Journal 제60권 제3호
발행연도
2019.1
수록면
298 - 307 (10page)

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Purpose: Previous study has well documented the anti-apoptotic effects of miR-590 on oxidized low-density lipoprotein (ox-LDL)-treated endothelial cells (ECs). However, the mechanism underlying the anti-apoptotic effects of miR-590 in ox-LDL-treated ECsremains to be further addressed. Materials and Methods: ApoE-/- mice fed with a high-fat diet (HFD) and human aortic endothelial cells (HAECs) treated with ox-LDL were used as in vivo and in vitro models of atherosclerosis. The expressions of miR-590 and toll-like receptor 4 (TLR4) weredetected by quantitative real-time PCR and Western blot, respectively. Atherosclerotic lesion analysis was performed using Evansblue and hematoxylin-eosin staining. Cell proliferation was assessed by MTT assay. Apoptosis was examined using flow cytometryanalysis and Western blot analysis of Cleaved poly (ADP-ribose) polymerase (PARP) and Cleaved Caspase-3 levels. The effect ofmiR-590 on TLR4/nuclear factor kappa B (NF-κB) pathway was evaluated by Western blot. Binding between miR-590 and TLR4was confirmed by luciferase reporter assay and Western blot. Results: miR-590 was downregulated in the aorta tissues from HFD-fed apoE-/- mice and ox-LDL-treated HAECs. miR-590 overexpressioninhibited atherosclerotic lesion in HFD-induced apoE-/- mice and promoted proliferation and inhibited apoptosis of ox-LDL-treated HAECs. Additionally, TLR4 was identified as a direct target of miR-590 in ox-LDL-treated HAECs. Moreover, antimiR-590 reversed TLR4 knockdown-mediated promotion of cell proliferation and suppression of apoptosis in ox-LDL-treatedHAECs. miR-590 overexpression suppressed the TLR4/NF-κB pathway, and inhibition of the TLR4/NF-κB pathway promoted cellproliferation and impeded apoptosis in ox-LDL-treated HAECs. Conclusion: miR-590 promoted proliferation and blocked ox-LDL-induced apoptosis in HAECs through inhibition of the TLR4/NF-κB pathway.

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