TRB3, upregulated by ox-LDL, mediates human monocyte-derived macrophage apoptosis.
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.
Shang
Yuan-yuan
YY
Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Department of Cardiology, Qilu Hospital of Shandong University, Ji'nan, China.
Wang
Zhi-hao
ZH
Zhang
Li-ping
LP
Zhong
Ming
M
Zhang
Yun
Y
Deng
Jing-ti
JT
Zhang
Wei
W
D017209:Apoptosis / Q000502:physiology*; D001483:Base Sequence; D015153:Blotting, Western; D018797:Cell Cycle Proteins / Q000235:genetics / Q000502:physiology*; D002478:Cells, Cultured; D017931:DNA Primers; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D008077:Lipoproteins, LDL / Q000502:physiology*; D008264:Macrophages / Q000166:cytology*; D009000:Monocytes / Q000166:cytology*; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000502:physiology* / Q000037:antagonists & inhibitors; D012333:RNA, Messenger / Q000235:genetics; D012097:Repressor Proteins / Q000235:genetics / Q000502:physiology*; D015854:Up-Regulation / Q000502:physiology*
D018797:Cell Cycle Proteins; D017931:DNA Primers; D008077:Lipoproteins, LDL; D012333:RNA, Messenger; D012097:Repressor Proteins; C474831:TRIB3 protein, human; C099252:oxidized low density lipoprotein; D017346:Protein Serine-Threonine Kinases