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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kawasaki, Shuji Senokuchi, Takafumi Tsutsumi, Atsuyuki Nishikawa, Takeshi Ishii, Norio Yano, Miyuki Kinoshita, Hiroyuki Matsumura, Takeshi Asano, Tomoichiro Motoshima, Hiroyuki Kojima, Kanou Araki, Eiichi |
| Description | Author Affiliation: Ishii N ( Department of Metabolic Medicine, Graduate School of Medical Sciences, Kumamoto University, Japan.) |
| Abstract | Macrophage-derived foam cells play important roles in the progression of atherosclerosis. We reported previously that ERK1/2-dependent granulocyte/macrophage colony-stimulating factor (GM-CSF) expression, leading to p38 MAPK/ Akt signaling, is important for oxidized low density lipoprotein (Ox-LDL)-induced macrophage proliferation. Here, we investigated whether activation of AMP-activated protein kinase (AMPK) could suppress macrophage proliferation. Ox-LDL-induced proliferation of mouse peritoneal macrophages was assessed by [(3)H]thymidine incorporation and cell counting assays. The proliferation was significantly inhibited by the AMPK activator 5-aminoimidazole-4-carboxamide ribonucleoside (AICAR) and restored by dominant-negative AMPKalpha1, suggesting that AMPK activation suppressed macrophage proliferation. AICAR partially suppressed Ox-LDL-induced ERK1/2 phosphorylation and GM-CSF expression, suggesting that another mechanism is also involved in the AICAR-mediated suppression of macrophage proliferation. AICAR suppressed GM-CSF-induced macrophage proliferation without suppressing p38 MAPK/Akt signaling. GM-CSF suppressed p53 phosphorylation and expression and induced Rb phosphorylation. Overexpression of p53 or p27(kip) suppressed GM-CSF-induced macrophage proliferation. AICAR induced cell cycle arrest, increased p53 phosphorylation and expression, and suppressed GM-CSF-induced Rb phosphorylation via AMPK activation. Moreover, AICAR induced p21(cip) and p27(kip) expression via AMPK activation, and small interfering RNA (siRNA) of p21(cip) and p27(kip) restored AICAR-mediated suppression of macrophage proliferation. In conclusion, AMPK activation suppressed Ox-LDL-induced macrophage proliferation by suppressing GM-CSF expression and inducing cell cycle arrest. These effects of AMPK activation may represent therapeutic targets for atherosclerosis. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 50 |
| Volume Number | 284 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2009-12-11 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | AMP-Activated Protein Kinases Metabolism Lipoproteins, LDL Pharmacology Macrophages, Peritoneal Drug Effects Genetics Aminoimidazole Carboxamide Analogs & Derivatives Animals Apoptosis Physiology Cell Cycle Cell Proliferation Cyclin-Dependent Kinase Inhibitor P21 Cyclin-Dependent Kinase Inhibitor P27 Enzyme Activation Extracellular Signal-Regulated MAP Kinases Granulocyte-Macrophage Colony-Stimulating Factor Cytology Mice Mice, Inbred C3H Proto-Oncogene Proteins C-akt Ribonucleotides Signal Transduction P38 Mitogen-Activated Protein Kinases Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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