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Journal Article
Research Support, Non-U.S. Gov't
TRB3, upregulated by ox-LDL, mediates human monocyte-derived macrophage apoptosis.
FEBS Journal 2009 May
Tribble3 (TRB3), a mammalian homolog of Drosophila tribbles, slows cell-cycle progression, and its expression is increased in response to various stresses. The aim of this study was to investigate the role of the TRB3 gene in macrophage apoptosis induced by oxidized low-density lipoprotein (ox-LDL). We found that, in human monocyte-derived macrophages, TRB3 is upregulated by ox-LDL in a dose- and time-dependent manner. The cell viability of TRB3-overexpressing macrophages was decreased, but apoptosis was increased and the level of activated caspase-3 increased. Factorial analyses revealed no significant interaction between TRB3 overexpression and ox-LDL stimulation with respect to macrophage apoptosis. Furthermore, TRB3-silenced macrophages showed decreased apoptosis, and TRB3-silenced cells treated with ox-LDL showed significantly increased apoptosis. Silencing of TRB3 and ox-LDL stimulation showed significant interaction for macrophage apoptosis, suggesting that TRB3 knockdown resisted the macrophage apoptosis induced by ox-LDL. Therefore, TRB3 in part mediates the macrophage apoptosis induced by ox-LDL, which suggests that TRB3 might be involved in vulnerable atherosclerotic plaque progression.
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