51
|
Kim EK, Park JM, Lim S, Choi JW, Kim HS, Seok H, Seo JK, Oh K, Lee DS, Kim KT, Ryu SH, Suh PG. Activation of AMP-activated protein kinase is essential for lysophosphatidic acid-induced cell migration in ovarian cancer cells. J Biol Chem 2011; 286:24036-45. [PMID: 21602274 PMCID: PMC3129185 DOI: 10.1074/jbc.m110.209908] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Revised: 05/05/2011] [Indexed: 01/30/2023] Open
Abstract
Lysophosphatidic acid (LPA) is a bioactive phospholipid that affects various biological functions, such as cell proliferation, migration, and survival, through LPA receptors. Among them, the motility of cancer cells is an especially important activity for invasion and metastasis. Recently, AMP-activated protein kinase (AMPK), an energy-sensing kinase, was shown to regulate cell migration. However, the specific role of AMPK in cancer cell migration is unknown. The present study investigated whether LPA could induce AMPK activation and whether this process was associated with cell migration in ovarian cancer cells. We found that LPA led to a striking increase in AMPK phosphorylation in pathways involving the phospholipase C-β3 (PLC-β3) and calcium/calmodulin-dependent protein kinase kinase β (CaMKKβ) in SKOV3 ovarian cancer cells. siRNA-mediated knockdown of AMPKα1, PLC-β3, or (CaMKKβ) impaired the stimulatory effects of LPA on cell migration. Furthermore, we found that knockdown of AMPKα1 abrogated LPA-induced activation of the small GTPase RhoA and ezrin/radixin/moesin proteins regulating membrane dynamics as membrane-cytoskeleton linkers. In ovarian cancer xenograft models, knockdown of AMPK significantly decreased peritoneal dissemination and lung metastasis. Taken together, our results suggest that activation of AMPK by LPA induces cell migration through the signaling pathway to cytoskeletal dynamics and increases tumor metastasis in ovarian cancer.
Collapse
Affiliation(s)
- Eung-Kyun Kim
- From the Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784
- the School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798
| | - Ji-Man Park
- the School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798
| | - Seyoung Lim
- the School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798
| | - Jung Woong Choi
- From the Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784
| | - Hyeon Soo Kim
- the Department of Anatomy, Korea University College of Medicine, 126-1, 5-ga, Anam-dong, Seongbuk-gu, Seoul 136-701
| | - Heon Seok
- the School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798
- the Department of Biomedical Engineering, Jungwon University, Goesan, Chungcheongbukdo 367-805, Republic of Korea
| | - Jeong Kon Seo
- the School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798
| | - Keunhee Oh
- the Department of Biomedical Sciences/Transplantation Research Institute, Seoul National University College of Medicine, Seoul 110-799, and
| | - Dong-Sup Lee
- the Department of Biomedical Sciences/Transplantation Research Institute, Seoul National University College of Medicine, Seoul 110-799, and
| | - Kyong Tai Kim
- From the Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784
| | - Sung Ho Ryu
- From the Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784
| | - Pann-Ghill Suh
- From the Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784
- the School of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798
| |
Collapse
|
52
|
Wang S, Liang B, Viollet B, Zou MH. Inhibition of the AMP-activated protein kinase-α2 accentuates agonist-induced vascular smooth muscle contraction and high blood pressure in mice. Hypertension 2011; 57:1010-7. [PMID: 21464390 DOI: 10.1161/hypertensionaha.110.168906] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The aim of the present study was to determine the effects and molecular mechanisms by which AMP-activated protein kinase (AMPK) regulates smooth muscle contraction and blood pressure in mice. In cultured human vascular smooth muscle cells, we observed that activation of AMPK by 5-aminoimidazole-4-carboxamide 1-β-d-ribofuranoside inhibited agonist-induced phosphorylation of myosin light chain (MLC) and myosin phosphatase targeting subunit 1 (MYPT1). Conversely, AMPK inhibition with pharmacological or genetic means potentiated agonist-induced the phosphorylation of MLC and MYPT1, whereas it inhibited both Ras homolog gene family member A and Rho-associated kinase activity. In addition, AMPK activation or Rho-associated kinase inhibition with Y27632 abolished agonist-induced phosphorylation of MLC and MYPT1. Gene silencing of p190-guanosine triphosphatase-activating protein abolished the effects of AMPK activation on MLC, MYPT1, and Ras homolog gene family member A in human smooth muscle cells. Ex vivo analyses revealed that agonist-induced contractions of the mesenteric artery and aortas were stronger in both AMPKα1(-/-) and AMPKα2(-/-) knockout mice than in wild-type mice. Inhibition of Rho-associated kinase with Y27632 normalized agonist-induced contractions of AMPKα1(-/-) and AMPKα2(-/-) vessels. AMPKα2(-/-) mice had higher blood pressure along with decreased serine phosphorylation of p190-guanosine triphosphatase-activating protein. Finally, inhibition of the Ras homolog gene family member A/Rho-associated kinase pathway with Y27632, which suppressed MYPT1 and MLC phosphorylation, lowered blood pressure in AMPKα2(-/-) mice. In conclusion, AMPK decreases vascular smooth muscle cell contractility by inhibiting p190-GTP-activating protein-dependent Ras homolog gene family member A activation, indicating that AMPK may be a new therapeutic target in lowering high blood pressure.
Collapse
Affiliation(s)
- Shuangxi Wang
- Division of Molecular Medicine, Department of Medicine, University of Oklahoma Health Sciences Center, BSEB 325, 941 Stanton L. Young Blvd, Oklahoma City, OK 73104, USA
| | | | | | | |
Collapse
|
53
|
Rho kinase inhibitors stimulate the migration of human cultured osteoblastic cells by regulating actomyosin activity. Cell Mol Biol Lett 2011; 16:279-95. [PMID: 21394446 PMCID: PMC6275969 DOI: 10.2478/s11658-011-0006-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Accepted: 03/02/2011] [Indexed: 11/20/2022] Open
Abstract
We investigated the effects of Rho-associated kinase (ROCK) on migration and cytoskeletal organization in primary human osteoblasts and Saos-2 human osteosarcoma cells. Both cell types were exposed to two different ROCK inhibitors, Y-27632 and HA-1077. In the improved motility assay used in the present study, Y-27632 and HA-1077 significantly increased the migration of both osteoblasts and osteosarcoma cells on plastic in a dose-dependent and reversible manner. Fluorescent images showed that cells of both types cultured with Y-27632 or HA-1077 exhibited a stellate appearance, with poor assembly of stress fibers and focal contacts. Western blotting showed that ROCK inhibitors reduced myosin light chain (MLC) phosphorylation within 5 min without affecting overall myosin light-chain protein levels. Inhibition of ROCK activity is thought to enhance the migration of human osteoblasts through reorganization of the actin cytoskeleton and regulation of myosin activity. ROCK inhibitors may be potentially useful as anabolic agents to enhance the biocompatibility of bone and joint prostheses.
Collapse
|
54
|
Mirouse V, Billaud M. The LKB1/AMPK polarity pathway. FEBS Lett 2010; 585:981-5. [PMID: 21185289 DOI: 10.1016/j.febslet.2010.12.025] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 12/15/2010] [Accepted: 12/16/2010] [Indexed: 12/26/2022]
Abstract
The LKB1 tumor suppressor kinase is an activator of the AMP-activated protein kinase (AMPK), a metabolic gauge that responds to variations of cellular energetic levels by favoring catabolic versus anabolic processes. Recent studies have provided substantial evidence that LKB1 and AMPK control cell polarity from invertebrates to mammals. This review examines how the LKB1-AMPK pathway, in conjunction with other positional signals, converts energy-sensing information into the activation of Myosin II to maintain epithelial-cell architecture but also to complete cell division. This molecular link between polarity and metabolism may constitute an ancient stress-response protective mechanism that was co-opted for tumor suppression during evolution.
Collapse
Affiliation(s)
- Vincent Mirouse
- GReD Laboratory, CNRS UMR 6247, INSERM U931, Clermont Université, Faculté de Médecine, 63000 Clermont-Ferrand, France.
| | | |
Collapse
|