201
|
Matsuda N, Yamamoto S, Hatakeyama N, Hattori Y. [Vascular endothelial dysfunction in septic shock]. Nihon Yakurigaku Zasshi 2008; 131:96-100. [PMID: 18277008 DOI: 10.1254/fpj.131.96] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
202
|
Kitamura T, Asai N, Enomoto A, Maeda K, Kato T, Ishida M, Jiang P, Watanabe T, Usukura J, Kondo T, Costantini F, Murohara T, Takahashi M. Regulation of VEGF-mediated angiogenesis by the Akt/PKB substrate Girdin. Nat Cell Biol 2008; 10:329-37. [PMID: 18264090 DOI: 10.1038/ncb1695] [Citation(s) in RCA: 173] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2007] [Accepted: 01/17/2008] [Indexed: 02/06/2023]
Abstract
The serine/threonine protein kinase Akt is involved in a variety of cellular processes including cell proliferation, survival, metabolism and gene expression. It is essential in vascular endothelial growth factor (VEGF)-mediated angiogenesis; however, it is not known how Akt regulates the migration of endothelial cells, a crucial process for vessel sprouting, branching and the formation of networks during angiogenesis. Here we report that Akt-mediated phosphorylation of Girdin, an actin-binding protein, promotes VEGF-dependent migration of endothelial cells and tube formation by these cells. We found that exogenously delivered adenovirus harbouring Girdin short interfering RNA in Matrigel embedded in mice, markedly inhibited VEGF-mediated angiogenesis. Targeted disruption of the Girdin gene in mice impaired vessel remodelling in the retina and angiogenesis from aortic rings, whereas Girdin was dispensable for embryonic vasculogenesis. These findings demonstrate that the Akt/Girdin signalling pathway is essential in VEGF-mediated postneonatal angiogenesis.
Collapse
Affiliation(s)
- Tomoya Kitamura
- Department of Cardiology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
203
|
Shiota M, Kusakabe H, Hikita Y, Nakao T, Izumi Y, Iwao H. Pharmacogenomics of Cardiovascular Pharmacology: Molecular Network Analysis in Pleiotropic Effects of Statin — an Experimental Elucidation of the Pharmacologic Action From Protein-Protein Interaction Analysis. J Pharmacol Sci 2008; 107:15-9. [DOI: 10.1254/jphs.08r01fm] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
204
|
Mahabeleshwar GH, Chen J, Feng W, Somanath PR, Razorenova OV, Byzova TV. Integrin affinity modulation in angiogenesis. Cell Cycle 2007; 7:335-47. [PMID: 18287811 DOI: 10.4161/cc.7.3.5234] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Integrins, transmembrane glycoprotein receptors, play vital roles in pathological angiogenesis, but their precise regulatory functions are not completely understood and remain controversial. This study aims to assess the regulatory functions of individual beta subunits of endothelial integrins in angiogenic responses induced by vascular endothelial growth factor (VEGF). Inhibition of expression of beta(1), beta(3), or beta(5) integrins in endothelial cells resulted in down regulation of EC adhesion and migration on the primary ligand for the corresponding integrin receptor, while no effects on the recognition of other ligands were detected. Although inhibition of expression of each subunit substantially affected capillary growth stimulated by VEGF, the loss of beta(3) integrin was the most inhibitory.
Collapse
Affiliation(s)
- Ganapati H Mahabeleshwar
- Department of Molecular Cardiology, Joseph J. Jacobs Center for Thrombosis and Vascular Biology, NB50, The Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA
| | | | | | | | | | | |
Collapse
|
205
|
Mu P, Gao X, Jia ZJ, Zheng RL. Natural antioxidant pedicularioside G inhibits angiogenesis and tumourigenesis in vitro and in vivo. Basic Clin Pharmacol Toxicol 2007; 102:30-4. [PMID: 17973903 DOI: 10.1111/j.1742-7843.2007.00146.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Pedicularioside G is a new compound of phenylpropanoid glycosides, isolated from Pedicularis striata in our laboratory. Pedicularioside G inhibited two major angiogenic responses, human umbilical vein endothelial cell proliferation and migration, as well as neovascularization in a chicken embryo chorioallantoic membrane model. In addition, pedicularioside G inhibited human hepatoma cells proliferation and migration in vitro along with transplanting tumour formation and growth in a chicken embryo chorioallantoic membrane model. So pedicularioside G has anti-angiogenic, antitumour growth, antimetastatic and antitumoural effects. Pedicularioside G also remarkably reduced reactive oxygen species level in both vein endothelial cells and hepatoma cells in a concentration-dependent manner. These results suggest that the anti-angiogenic and antitumoural effects of pedicularioside G might partially attribute to its antioxidative activity.
Collapse
Affiliation(s)
- Ping Mu
- Institute of Biophysics, School of Life Sciences, Lanzhou University, Lanzhou, China
| | | | | | | |
Collapse
|
206
|
Martinez-Poveda B, Munoz-Chapuli R, Rodriguez-Nieto S, Quintela JM, Fernandez A, Medina MA, Quesada AR. IB05204, a dichloropyridodithienotriazine, inhibits angiogenesis in vitro and in vivo. Mol Cancer Ther 2007; 6:2675-85. [DOI: 10.1158/1535-7163.mct-07-0136] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
207
|
Somanath PR, Kandel ES, Hay N, Byzova TV. Akt1 signaling regulates integrin activation, matrix recognition, and fibronectin assembly. J Biol Chem 2007; 282:22964-76. [PMID: 17562714 PMCID: PMC2731941 DOI: 10.1074/jbc.m700241200] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Akt, a serine-threonine kinase, regulates multiple cellular processes in vascular cells. We have previously documented that Akt activates integrins and Akt1 deficiency results in matrix abnormalities in skin and blood vessels in vivo. Based on these observations, we hypothesized that Akt1 is necessary for integrin activation and matrix assembly by fibroblasts. In this study, using various cell systems, we show that Akt1 is essential for the inside-out activation of integrins in endothelial cells and fibroblasts, which in turn, mediates matrix assembly. Fibronectin is a major extracellular matrix component of the skin and the vascular basement membrane, which possesses binding sites for many integrins and extracellular matrix proteins. Akt1(-/-) fibroblasts and NIH fibroblasts expressing dominant negative Akt1 (K179M-Akt1) showed impaired fibronectin assembly compared with control fibroblasts. In contrast, expression of constitutively active Akt1 (myrAkt1) resulted in enhanced fibronectin assembly. Although increased fibronectin assembly by myrAkt1-expressing human foreskin fibroblasts was abolished by treatment with anti-integrin beta(1) blocking antibodies, treatment with beta(1)-stimulating antibodies rescued the impaired fibronectin assembly that was due to lack of Akt activity. Finally, expression of myrAkt1 corrected the phenotype of Akt1(-/-) fibroblasts thus showing that Akt1 regulates fibronectin assembly through activation of integrin alpha(5)beta(1).
Collapse
Affiliation(s)
- Payaningal R. Somanath
- Department of Molecular Cardiology, J. J. Jacobs Center for Thrombosis, and Department of Vascular Biology, Lerner Research Institute, The Cleveland Clinic, Cleveland, Ohio 44195
| | - Eugene S. Kandel
- the Department of Molecular Genetics, Lerner Research Institute, The Cleveland Clinic, Cleveland, Ohio 44195
| | - Nissim Hay
- the Department of Molecular Genetics, College of Medicine, University of Illinois, Chicago, Illinois 60607
| | - Tatiana V. Byzova
- Department of Molecular Cardiology, J. J. Jacobs Center for Thrombosis, and Department of Vascular Biology, Lerner Research Institute, The Cleveland Clinic, Cleveland, Ohio 44195
- To whom correspondence should be addressed: Joseph J. Jacobs Center for Thrombosis and Vascular Biology, Dept. of Molecular Cardiology, The Cleveland Clinic, NB50, 9500 Euclid Ave., Cleveland, OH 44195. Tel.: 216-445-4312; Fax: 216-445-8204; E-mail:
| |
Collapse
|
208
|
Levine YC, Li GK, Michel T. Agonist-modulated regulation of AMP-activated protein kinase (AMPK) in endothelial cells. Evidence for an AMPK -> Rac1 -> Akt -> endothelial nitric-oxide synthase pathway. J Biol Chem 2007; 282:20351-64. [PMID: 17519230 DOI: 10.1074/jbc.m702182200] [Citation(s) in RCA: 172] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The endothelial isoform of nitric-oxide synthase (eNOS), a key determinant of vascular homeostasis, is a calcium/calmodulin-dependent phosphoprotein regulated by diverse cell surface receptors. Vascular endothelial growth factor (VEGF) and sphingosine 1-phosphate (S1P) stimulate eNOS activity through Akt/phosphoinositide 3-kinase and calcium-dependent pathways. AMP-activated protein kinase (AMPK) also activates eNOS in endothelial cells; however, the molecular mechanisms linking agonist-mediated AMPK regulation with eNOS activation remain incompletely understood. We studied the role of AMPK in VEGF- and S1P-mediated eNOS activation and found that both agonists led to a striking increase in AMPK phosphorylation in pathways involving the calcium/calmodulin-dependent protein kinase kinase beta. Treatment with tyrosine kinase inhibitors or the phosphoinositide 3-kinase inhibitor wortmannin demonstrated differential effects of VEGF versus S1P. Small interfering RNA (siRNA)-mediated knockdown of AMPKalpha1or Akt1 impaired the stimulatory effects of both VEGF and S1P on eNOS activation. AMPKalpha1 knockdown impaired agonist-mediated Akt phosphorylation, whereas Akt1 knockdown did not affect AMPK activation, thus suggesting that AMPK lies upstream of Akt in the pathway leading from receptor activation to eNOS stimulation. Importantly, we found that siRNA-mediated knockdown of AMPKalpha1 abrogates agonist-mediated activation of the small GTPase Rac1. Conversely, siRNA-mediated knockdown of Rac1 decreased the agonist-mediated phosphorylation of AMPK substrates without affecting that of AMPK, implicating Rac1 as a molecular link between AMPK and Akt in agonist-mediated eNOS activation. Finally, siRNA-mediated knockdown of caveolin-1 significantly enhanced AMPK phosphorylation, suggesting that AMPK is negatively regulated by caveolin-1. Taken together, these results suggest that VEGF and S1P differentially regulate AMPK and establish a central role for an agonist-modulated AMPK --> Rac1 --> Akt axis in the control of eNOS in endothelial cells.
Collapse
Affiliation(s)
- Yehoshua C Levine
- Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA
| | | | | |
Collapse
|
209
|
Zhou X, Tian F, Sandzén J, Cao R, Flaberg E, Szekely L, Cao Y, Ohlsson C, Bergo MO, Borén J, Akyürek LM. Filamin B deficiency in mice results in skeletal malformations and impaired microvascular development. Proc Natl Acad Sci U S A 2007; 104:3919-24. [PMID: 17360453 PMCID: PMC1820684 DOI: 10.1073/pnas.0608360104] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Mutations in filamin B (FLNB), a gene encoding a cytoplasmic actin-binding protein, have been found in human skeletal disorders, including boomerang dysplasia, spondylocarpotarsal syndrome, Larsen syndrome, and atelosteogenesis phenotypes I and III. To examine the role of FLNB in vivo, we generated mice with a targeted disruption of Flnb. Fewer than 3% of homozygous embryos reached term, indicating that Flnb is important in embryonic development. Heterozygous mutant mice were indistinguishable from their wild-type siblings. Flnb was ubiquitously expressed; strong expression was found in endothelial cells and chondrocytes. Flnb-deficient fibroblasts exhibited more disorganized formation of actin filaments and reduced ability to migrate compared with wild-type controls. Flnb-deficient embryos exhibited impaired development of the microvasculature and skeletal system. The few Flnb-deficient mice that were born were very small and had severe skeletal malformations, including scoliotic and kyphotic spines, lack of intervertebral discs, fusion of vertebral bodies, and reduced hyaline matrix in extremities, thorax, and vertebrae. These mice died or had to be euthanized before 4 weeks of age. Thus, the phenotypes of Flnb-deficient mice closely resemble those of human skeletal disorders with mutations in FLNB.
Collapse
Affiliation(s)
- Xianghua Zhou
- *Sahlgrenska Center for Cardiovascular and Metabolic Research, Wallenberg Laboratory
- Institute of Biomedicine, Department of Medical Chemistry and Cell Biology, and
| | - Fei Tian
- *Sahlgrenska Center for Cardiovascular and Metabolic Research, Wallenberg Laboratory
| | - Johan Sandzén
- *Sahlgrenska Center for Cardiovascular and Metabolic Research, Wallenberg Laboratory
| | - Renhai Cao
- Microbiology and Tumor Biology Center, Karolinska Institute, SE 177 77 Stockholm, Sweden
| | - Emilie Flaberg
- Microbiology and Tumor Biology Center, Karolinska Institute, SE 177 77 Stockholm, Sweden
| | - Laszlo Szekely
- Microbiology and Tumor Biology Center, Karolinska Institute, SE 177 77 Stockholm, Sweden
| | - Yihai Cao
- Microbiology and Tumor Biology Center, Karolinska Institute, SE 177 77 Stockholm, Sweden
| | - Claes Ohlsson
- Center for Bone Research, Institute of Medicine, Göteborg University, SE 413 45 Göteborg, Sweden; and
| | - Martin O. Bergo
- *Sahlgrenska Center for Cardiovascular and Metabolic Research, Wallenberg Laboratory
| | - Jan Borén
- *Sahlgrenska Center for Cardiovascular and Metabolic Research, Wallenberg Laboratory
| | - Levent M. Akyürek
- *Sahlgrenska Center for Cardiovascular and Metabolic Research, Wallenberg Laboratory
- Institute of Biomedicine, Department of Medical Chemistry and Cell Biology, and
- To whom correspondence should be addressed at:
Göteborg University, Bruna stråket 16, SE 413 45 Göteborg, Sweden. E-mail:
| |
Collapse
|
210
|
Nakao T, Shiota M, Tatemoto Y, Izumi Y, Iwao H. Pravastatin Induces Rat Aortic Endothelial Cell Proliferation and Migration via Activation of PI3K/Akt/mTOR/p70 S6 Kinase Signaling. J Pharmacol Sci 2007; 105:334-41. [DOI: 10.1254/jphs.fp0070682] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
211
|
Takeda Y, Kazarov AR, Butterfield CE, Hopkins BD, Benjamin LE, Kaipainen A, Hemler ME. Deletion of tetraspanin Cd151 results in decreased pathologic angiogenesis in vivo and in vitro. Blood 2006; 109:1524-32. [PMID: 17023588 PMCID: PMC1794066 DOI: 10.1182/blood-2006-08-041970] [Citation(s) in RCA: 133] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Tetraspanin protein CD151 is abundant on endothelial cells. To determine whether CD151 affects angiogenesis, Cd151-null mice were prepared. Cd151-null mice showed no vascular defects during normal development or during neonatal oxygen-induced retinopathy. However, Cd151-null mice showed impaired pathologic angiogenesis in other in vivo assays (Matrigel plug, corneal micropocket, tumor implantation) and in the ex vivo aortic ring assay. Cd151-null mouse lung endothelial cells (MLECs) showed normal adhesion and proliferation, but marked alterations in vitro, in assays relevant to angiogenesis (migration, spreading, invasion, Matrigel contraction, tube and cable formation, spheroid sprouting). Consistent with these functional impairments, and with the close, preferential association of CD151 with laminin-binding integrins, Cd151-null MLECs also showed selective signaling defects, particularly on laminin substrate. Adhesion-dependent activation of PKB/c-Akt, e-NOS, Rac, and Cdc42 was diminished, but Raf, ERK, p38 MAP kinase, FAK, and Src were unaltered. In Cd151-null MLECs, connections were disrupted between laminin-binding integrins and at least 5 other proteins. In conclusion, CD151 modulates molecular organization of laminin-binding integrins, thereby supporting secondary (ie, after cell adhesion) functions of endothelial cells, which are needed for some types of pathologic angiogenesis in vivo. Selective effects of CD151 on pathologic angiogenesis make it a potentially useful target for anticancer therapy.
Collapse
Affiliation(s)
- Yoshito Takeda
- Dana-Farber Cancer Institute, Vascular Biology Program, Children's Hospital, and Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
| | | | | | | | | | | | | |
Collapse
|