• mir-155 inhibits oxidized low-density lipoprotein-induced apoptosis of raw264.7 cells

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     macrophage apoptosis is a prominent feature of advanced atherosclerotic plaques. here, we examined the hypothesis that the apoptotic machinery is regulated by microrna-155 (mir-155). constitutive expression of mir-155 was detected in raw264.7 cells, which was increased following stimulation with oxidized low-density lipoprotein (oxldl) in a dose- and time-dependent manner. oxldl-treated raw264.7 cells showed a marked time- and dose-dependent increase in apoptosis, which was suppressed in the presence of mimics and increased with antagonists of mir-155. bioinformatics analysis revealed fas-associated death domain-containing protein (fadd) as a putative target of mir-155. luciferase reporter assay and western blot further disclosed that mir-155 inhibits fadd expression by directly targeting the 3′-utr region. we propose that mir-155 attenuates the macrophage apoptosis, at least in part, through fadd regulation, since forced expression of fadd blocked the ability of mir-155 to inhibit apoptosis. our results collectively suggest that mir-155 attenuates apoptosis of oxldl-mediated raw264.7 cells by targeting fadd, supporting a possible therapeutic role in atherosclerosis.

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