LPA
| Autor: | Feng, Hao, Qiwei, Liu, Fuqiang, Zhang, Jiaxin, Du, Amanda, Dumire, Xuemin, Xu, Mei-Zhen, Cui |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
MASMC
mouse aortic smooth muscle cell TRPP Cation Channels MAP Kinase Signaling System Myocytes Smooth Muscle SMC smooth muscle cell ERK extracellular-signal-regulated kinase Muscle Smooth Vascular LPA2 LPA receptor 2 Mitogen-Activated Protein Kinase 14 Mice LDL low-density lipoprotein MEK mitogen-activated protein kinase kinase Animals Mitogen-Activated Protein Kinase 9 Receptors Lysophosphatidic Acid oxLDL oxidized LDL Egr1 early growth response protein 1 Aorta LPA1 LPA receptor 1 vascular biology p38 MAPK p38 mitogen-activated protein kinases smooth muscle cells Enzyme Activation PKD protein kinase D JNK Jun N-terminal kinases TF tissue factor gene expression lipids (amino acids peptides and proteins) lipid signaling biological phenomena cell phenomena and immunity Lysophospholipids atherosclerosis signal transduction LPA lysophosphatidic acid MAPK mitogen-activated protein kinase Research Article |
| Zdroj: | The Journal of Biological Chemistry |
| ISSN: | 1083-351X |
| Popis: | Tissue factor (TF) is the principal initiator of blood coagulation and is necessary for thrombosis. We previously reported that lysophosphatidic acid (LPA), a potent bioactive lipid, highly induces TF expression at the transcriptional level in vascular smooth muscle cells. To date, however, the specific role of the LPA receptor is unknown, and the intracellular signaling pathways that lead to LPA induction of TF have been largely undetermined. In the current study, we found that LPA markedly induced protein kinase D (PKD) activation in mouse aortic smooth muscle cells (MASMCs). Small-interfering RNA-mediated knockdown of PKD2 blocked LPA-induced TF expression and activity, indicating that PKD2 is the key intracellular mediator of LPA signaling leading to the expression and cell surface activity of TF. Furthermore, our data reveal a novel finding that PKD2 mediates LPA-induced TF expression via the p38α and JNK2 MAPK signaling pathways, which are accompanied by the PKD-independent MEK1/2-ERK-JNK pathway. To identify the LPA receptor(s) responsible for LPA-induced TF expression, we isolated MASMCs from LPA receptor-knockout mice. Our results demonstrated that SMCs isolated from LPA receptor 1 (LPA1)-deficient mice completely lost responsiveness to LPA stimulation, which mediates induction of TF expression and activation of PKD and p38/JNK MAPK, indicating that LPA1 is responsible for PKD2-mediated activation of JNK2 and p38α. Taken together, our data reveal a new signaling mechanism in which the LPA1-PKD2 axis mediates LPA-induced TF expression via the p38α and JNK2 pathways. This finding provides new insights into LPA signaling, the PKD2 pathway, and the mechanisms of coagulation/atherothrombosis. |
| Databáze: | OpenAIRE |
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