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From the Molecular Cardiology/Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Mass.
Correspondence to Kenneth Walsh, PhD, Molecular Cardiology/CVI, Boston University School of Medicine, 715 Albany St, W611, Boston, MA 02118. E-mail kwalsh{at}world.std.com
| Abstract |
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Key Words: Akt endothelial cells angiogenesis statins endothelial nitric oxide synthase
| Introduction |
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| PI3K-Akt Signaling Axis: Upstream Activators and Downstream Targets |
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, Akt2/PKBß, and Akt3/PKB
, whereas Drosophila melanogaster and Caenorhabditis elegans contain one and two Akt genes, respectively.9,10 These genes encode proteins containing a pleckstrin homology (PH) domain in the amino terminus, a central kinase domain, and a carboxy terminal regulatory domain. All 3 mammalian Akt genes are widely expressed in various tissues but Akt1 is most abundant in brain, heart, and lung, whereas Akt2 is predominantly expressed in skeletal muscle and embryonic brown fat, and Akt3 is predominantly expressed in brain, kidney, and embryonic heart.7,1113 In unstimulated cells, Akt protein exists in cytoplasm and the two regulatory phosphorylation sites at threonine at 308 and serine at 473 are in an unphosphorylated state. On growth factor stimulation, the PH domain binds to the lipid products of PI3K, and Akt is recruited to plasma membrane. Akt is then sequentially phosphorylated at T308 and S473 by upstream kinases referred to as 3-phosphoinositidedependent protein kinase 1 (PDK1) and PDK2, respectively, to yield a fully activated kinase (Figure 1). 14,15 PDK1 has been isolated and characterized,15 but the identity of PDK2 is still controversial. Several candidate molecules have been suggested to be a potential S473-kinase including integrin-linked kinase (ILK), MAP kinaseactivated protein kinase 2 (MK2), PDK1 (conversion of substrate specificity in association with protein kinase Crelated kinase-2 [PRK2]) and Akt itself (autophosphorylation).1619 Fully activated Akt becomes available to phosphorylate its downstream substrates and a portion of these molecules detach from the plasma membrane and translocate to various subcellular locations including nucleus.20 Akt is then dephosphorylated and inactivated by protein phosphatases such as protein phosphatase 2A (PP2A).21
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Akt is a critical regulator of PI3K-mediated cell survival.22,23 A large number of studies have demonstrated in various cell types that constitutive activation of Akt signaling is sufficient to block cell death induced by a variety of apoptotic stimuli and that transduction of dominant-negative Akt inhibits growth factorinduced cell survival.2426 The prosurvival function of Akt has also been demonstrated in the context of the intact organism. Mutation of Drosophila Akt leads to embryonic lethality due to massive apoptosis during embryogenesis,27 and Akt1 mutant mice exhibit increased spontaneous apoptosis in testis and thymus.28 Several downstream targets of Akt are recognized to be apoptosis-regulatory molecules including Bad, FKHR family of forkhead transcription factors, and IKK
,2935 and these findings are consistent with the notion that Akt functions as a survival kinase. However, other downstream effectors of Akt are involved in different aspects of cellular regulation. For example, (1) Akt enhances glucose uptake by inducing membrane translocation of the glucose transporter GLUT4,36 (2) Akt promotes glycogen synthesis through the phosphorylation and inactivation of glycogen synthase kinase-3 (GSK-3),37 (3) Akt regulates cell cycle and cellular senescence, at least in part, through modulating the activities of E2F, p21, MDM2, and human telomerase reverse transcriptase subunit (hTERT),3844 and (4) Akt enhances protein synthesis through increasing the phosphorylation of mammalian target of rapamycin (mTOR), eukaryotic initiation factor 4E-binding protein 1 (4E-BP1), and 70-kDa S6 kinase (S6K1),15,45 although S6K1 may also be directly activated by PDK1 in a PI3K-dependent and Akt-independent fashion (Figure 1).46,47 Taken together, it is more appropriate to classify Akt as a multifunctional protein kinase rather than a simple regulator of cell survival.
| Akt-Dependent Survival Signals in Endothelial Cells |
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Growth factor activation of angiogenesis is dependent on proper endothelial cellextracellular matrix attachment,60 and in the absence of matrix attachment, cells undergo apoptotic cell death through a process termed anoikis (a Greek word for "homelessness").61 VEGF activation of Akt in endothelial cells is dependent on matrix attachment, and constitutively active Akt blocks cell detachmentinduced apoptosis.50 These findings suggest that matrix attachment is required for growth factors to activate Akt and maintain endothelial cell viability. Cell attachment is mediated mainly through the engagement of extracellular matrix with integrin molecules. When integrins bind to extracellular matrix they become clustered and associate with the actin cytoskeleton through adaptor/signaling molecules, which further promotes integrin clustering and the assembly of actin filaments and leads to the formation of focal adhesion and activation of intracellular signaling.62 The
v integrin combinations have been most extensively investigated in terms of their roles in angiogenesis.63 Endothelial cells stimulated with angiogenic growth factors or those in newly formed vessels express high levels of
vß3 integrin, and antagonists against
vß3 or
vß5 integrin block the growth factor-induced angiogenesis. It has also been shown that
vß3 integrin associates with VEGF and platelet-derived growth factor (PDGF) receptors and potentiates VEGF or PDGF signaling, respectively.63 Because several integrin signaling molecules including focal adhesion kinase (FAK), ILK, and Shc have been implicated in Akt activation,61 downregulation of Akt activity induced by cell detachment is likely due to the decrease in integrin-dependent Akt activation. Caspase-mediated cleavage of Akt is also implicated in the downregulation of Akt protein level during long-term suspension culture.64 Collectively, these findings suggest that integrin signaling induced by cell attachment (outside-in signal) is an important regulator of growth factordependent endothelial cell survival and angiogenesis through PI3K-Akt pathways. Furthermore, VEGF-induction of inside-out signals has also been shown to activate integrins, 65 suggesting that integrin and growth factor signaling are cooperative and synergistic with regard to activation of Akt signaling (Figure 2).
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Currently, relatively little is known about the downstream mediators of Akt-dependent survival pathway in endothelial cells, although several candidate molecules has been identified including survivin,51 FLICE-inhibitory protein (FLIP),66 and MEKK3.67 Thus, possible combinations of these and other unidentified Akt target molecules may control endothelial cell survival depending on the context of pro- and antiapoptotic stimuli encountered in the cellular environment.
| Regulation of Endothelial Nitric Oxide Synthase (eNOS) Activity by Akt |
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The activity of eNOS is also regulated by subcellular localization and/or protein-protein interactions. Of note, eNOS has been shown to be localized in a specific domain of plasma membrane called caveolae and to interact with caveolin-1 through caveolin-1 scaffolding domain, which inhibits eNOS activity.7881 Although originally implicated in transmembrane trafficking of macromolecules, the finding that caveolae contain a variety of signaling molecules and caveolin-1 directly interacts with those caveolae-associated proteins have suggested that caveolae and caveolin-1 are involved in the compartmentalization and integration of signal transduction pathways at the cell membrane. Consistent with the inhibitory role of caveolin-1 on eNOS activity, administration of caveolin-1 scaffolding domain fused to cellular internalization sequences in vivo attenuates eNOS activity,82 and acetylcholine-induced vasorelaxation and NO production are enhanced in caveolin-1-deficient mice.83 The targeting of eNOS to caveolae, however, seems to be required for efficient and proper activation of eNOS on stimulation, because conditions that inhibit the localization of eNOS in caveolae also attenuate eNOS activity.84,85 It has also been shown that eNOS interacts with heat shock protein 90 (Hsp90) on stimulation with VEGF or shear stress, and this interaction enhances eNOS activity.86 Interestingly, Akt also interacts with Hsp90 on stimulation and this interaction enhances Akt enzymatic activity,87 suggesting that Hsp90 may serve as a scaffold protein for the efficient phosphorylation of eNOS by Akt at caveolae (Figure 3).88,89,89a
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| Regulation of Endothelial Cell Migration by Akt |
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Studies in other cell types have also implicated PI3K and Akt in the control of directional cell migration and the sensing of chemoattractant gradients by the cell. It has been shown that Akt transiently localizes to the leading edge membrane of migratory cells in a PI3K-dependent manner,96,97 and gene ablation studies in mice have demonstrated that PI3K
is required for chemotaxis and chemoattractant-dependent activation of Akt in macrophages and neutrophils.98100 Akt has been shown to be required for chemotaxis in Dictyostelium cells as well.96
Cellular movement requires the reorganization of actin cytoskeleton and distinct patterns of actin reorganization are required as cells establish leading edge and then generate contractile force to migrate forward.101 Previous studies have implicated the Rho family of small G proteins as one of the major regulators of actin reorganization. Among Rho family members, Rho, Rac, and Cdc42 are most widely studied and each regulates specific aspects of cytoskeletal reorganization. Rho stimulates cytoplasmic stress fiber formation and actomyosin-based contractility, Rac induces membrane ruffling and extension of lamellipodia, and Cdc42 induces the extension of membrane protrusions (filopodia) and is also involved in chemoattractant gradient sensing.102,103 In endothelial cells, it has been shown that VEGF-induced cell migration is dependent on Rho family GTPases.104,105 However, the relationship between Akt and Rho family of G proteins is complicated and controversial. On one hand, Akt was shown to negatively regulate Rac1 activity by phosphorylating Rac1 and inhibiting its GTP-binding activity.106 In contrast, a recent study has demonstrated that Akt phosphorylates S1P receptor EDG-1 and induces Rac activation and cell migration in endothelial cells.107 Other reports show that Rac and Cdc42 are situated upstream of Akt and that they promote Akt signaling.108110 Consistent with these findings, Akt has been shown to be required for cell motility induced by Rac or Cdc42 in fibroblasts.108
Another possible downstream effector of Akt that regulates cell motility is p21-activated protein kinase (PAK). PAK was originally identified as a Rac1-binding protein that specifically interacts with GTP-bound form of Rac.111 Subsequently, it was shown that PAK is activated by Rac or Cdc42 and that it regulates polarized cytoskeletal reorganization.111 Recently it was shown in Dictyostelium cells that Akt regulates cell polarity and chemotaxis through the regulatory phosphorylation of PAK,112 suggesting a direct functional link between Akt and PAK in the regulation of cytoskeletal reorganization. In mammalian fibroblasts, it was also shown that Akt stimulates PAK1 activation and dominant-negative Akt inhibits Ras-induced activation of PAK1.113 However, the Akt phosphorylation site in Dictyostelium PAK is not conserved in mammalian PAK1, suggesting an indirect activation of mammalian PAK1 by Akt. Nonetheless, PAK family of protein kinases are attractive candidates for Akt effectors in the regulation of endothelial cell migration, and may be a convergence point of signals from Rac/Cdc42 and Akt.
| Statins and Akt Signaling |
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Recent research has revealed a link between statins and Akt. Statins have been shown to rapidly promote the activation of Akt in endothelial cells leading to eNOS phosphorylation and increased NO production.91 Low statin concentrations have been shown to protect endothelial cells from serum deprivationinduced apoptosis and promote capillary-like structure formation on matrigel in an Akt-dependent manner, whereas higher concentrations are toxic.91 Consistent with their Akt-activating function, treatment with clinically-relevant doses of statins enhances angiogenesis in the ischemic hindlimbs of normocholesterolemic animals through an eNOS-dependent mechanism.91,120 It has also been shown that the activation of angiogenesis by statins is biphasic: low doses promote vessel formation, whereas high doses inhibit angiogenesis.121 More recently, it was shown that statins enhance the mobilization of endothelial progenitor cells (EPCs) from bone marrow to newly forming blood vessels in a PI3K-Aktdependent manner,122,123 suggesting another mechanism of Akt-dependent proangiogenic effects of statins. Moreover, it has been shown that statins promote EPC mobilization in patients with stable coronary heart diseases.124 Although there are numerous lines of evidence to suggest that statins promote endothelial cell function and angiogenesis, there is no evidence in clinical studies linking statin treatment to increase in cancer risk.125
Activation of Akt by statins is blocked by treatment with wortmannin or LY294002,91 suggesting that statin activation of Akt is mediated by PI3K. However, the mechanisms by which statins activate PI3K are unknown at present. In this regard, statins have been shown to decrease caveolin-1eNOS interaction and enhance the formation of eNOS-Hsp90-Akt complex in endothelial cells,89 although it is not clear whether these effects of statins are secondary to Akt activation or not. It should also be noted that endothelial cells are relatively unique in this response because activation of Akt by statins is not observed in cardiac or smooth muscle cells, 91 suggesting an endothelial cellspecific pathway of PI3K-Akt activation. A recent report has shown that low, clinically relevant doses of statin activate endothelial Ras and promote Akt and eNOS phosphorylation.126 It was also reported that higher statin doses are toxic to endothelial cells although they promote an increase in eNOS protein expression. Presumably, the toxicity results from an inhibition of protein prenylation,127 and this may explain the antiangiogenic effects observed in studies performed with higher statin concentrations.128,129
In addition to their proangiogenic effects, statins have also been shown to exhibit antithrombotic actions in humans, which appears to be independent of their serum cholesterol-lowering effects.130 Recent studies have shown that PI3K-Akt pathway inhibits the expression of tissue factor,131,132 which is the primary cellular initiator of blood coagulation and whose expression is induced in endothelial cells and macrophages by a number of stimuli, including interleukin-1ß and tumor necrosis factor-
.133 Although VEGF activates both tissue factor expression and PI3K-Akt signaling, administration of inhibitors of PI3K-Akt signaling further enhances VEGF-induced tissue factor expression.131,132 Taken together, these data suggest that statins may inhibit blood coagulation, at least in part, through a selective activation of PI3K-Akt signaling in endothelial cells, leading to an inhibition of tissue factor expression.
| Integrated Regulation of Growth and Angiogenesis by Akt |
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In higher animals, organ growth is accompanied by the recruitment of new blood vessels. The dual role of Akt signaling in angiogenesis and tissue growth suggests that both processes can be coordinately regulated by this signaling step during organ enlargement. Consistent with this notion, it has been demonstrated that exercise training, a well-known stimulator of muscle hypertrophy, enhances VEGF expression and increases vessel density in skeletal muscles, and that exercise-induced increase in vessel density is blocked by a VEGF-neutralizing antibody.138 Likewise, cardiac muscle cell-specific deletion of VEGF gene results in thin ventricular wall with fewer coronary vessels.139 These results indicate that angiogenesis associated with physiological muscle tissue growth is dependent on paracrine VEGF secretion. Based on the notion that Akt positively regulates organ growth, we have examined the hypothesis that Akt may be involved in VEGF secretion associated with muscle hypertrophy. Indeed, overexpression of Akt in skeletal muscles in vivo induces skeletal muscle hypertrophy, local VEGF production, and angiogenesis.140 Collectively, these findings suggest that Akt signaling in both muscle cells and endothelial cells coordinately regulate overall growth of muscle tissues in vertebrates. This concept may also be applicable to other organs as well.
| Conclusions |
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| Acknowledgments |
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Received March 27, 2002; revision received April 30, 2002; accepted May 6, 2002.
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B. Luo, Y. Soesanto, and D. A. McClain Protein Modification by O-Linked GlcNAc Reduces Angiogenesis by Inhibiting Akt Activity in Endothelial Cells Arterioscler Thromb Vasc Biol, April 1, 2008; 28(4): 651 - 657. [Abstract] [Full Text] [PDF] |
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V. Tchaikovski, G. Fellbrich, and J. Waltenberger The Molecular Basis of VEGFR-1 Signal Transduction Pathways in Primary Human Monocytes Arterioscler Thromb Vasc Biol, February 1, 2008; 28(2): 322 - 328. [Abstract] [Full Text] [PDF] |
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K. N. Papanicolaou, Y. Izumiya, and K. Walsh Forkhead Transcription Factors and Cardiovascular Biology Circ. Res., January 4, 2008; 102(1): 16 - 31. [Abstract] [Full Text] [PDF] |
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D. Xiao and S. V. Singh z-Guggulsterone, a constituent of Ayurvedic medicinal plant Commiphora mukul, inhibits angiogenesis in vitro and in vivo Mol. Cancer Ther., January 1, 2008; 7(1): 171 - 180. [Abstract] [Full Text] [PDF] |
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P. Madeddu, N. Kraenkel, L. S. Barcelos, M. Siragusa, P. Campagnolo, A. Oikawa, A. Caporali, A. Herman, O. Azzolino, L. Barberis, et al. Phosphoinositide 3-Kinase {gamma} Gene Knockout Impairs Postischemic Neovascularization and Endothelial Progenitor Cell Functions Arterioscler Thromb Vasc Biol, January 1, 2008; 28(1): 68 - 76. [Abstract] [Full Text] [PDF] |
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E. J. Lim, E. J. Smart, M. Toborek, and B. Hennig The role of caveolin-1 in PCB77-induced eNOS phosphorylation in human-derived endothelial cells Am J Physiol Heart Circ Physiol, December 1, 2007; 293(6): H3340 - H3347. [Abstract] [Full Text] [PDF] |
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N. Matsunaga, Y. Chikaraishi, M. Shimazawa, S. Yokota, and H. Hara Vaccinium myrtillus (Bilberry) Extracts Reduce Angiogenesis In Vitro and In Vivo Evid. Based Complement. Altern. Med., October 27, 2007; (2007) nem151v1. [Abstract] [Full Text] [PDF] |
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M.-J. Park, H.-J. Kwak, H.-C. Lee, D.-H. Yoo, I.-C. Park, M.-S. Kim, S.-H. Lee, C. H. Rhee, and S.-I. Hong Nerve Growth Factor Induces Endothelial Cell Invasion and Cord Formation by Promoting Matrix Metalloproteinase-2 Expression through the Phosphatidylinositol 3-Kinase/Akt Signaling Pathway and AP-2 Transcription Factor J. Biol. Chem., October 19, 2007; 282(42): 30485 - 30496. [Abstract] [Full Text] [PDF] |
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M. B. Joshi, D. Ivanov, M. Philippova, P. Erne, and T. J. Resink Integrin-linked kinase is an essential mediator for T-cadherin-dependent signaling via Akt and GSK3{beta} in endothelial cells FASEB J, October 1, 2007; 21(12): 3083 - 3095. [Abstract] [Full Text] [PDF] |
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M. C. Deregibus, V. Cantaluppi, R. Calogero, M. Lo Iacono, C. Tetta, L. Biancone, S. Bruno, B. Bussolati, and G. Camussi Endothelial progenitor cell derived microvesicles activate an angiogenic program in endothelial cells by a horizontal transfer of mRNA Blood, October 1, 2007; 110(7): 2440 - 2448. [Abstract] [Full Text] [PDF] |
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C. S. Boosani, A. P. Mannam, D. Cosgrove, R. Silva, K. M. Hodivala-Dilke, V. G. Keshamouni, and A. Sudhakar Regulation of COX-2 mediated signaling by {alpha}3 type IV noncollagenous domain in tumor angiogenesis Blood, August 15, 2007; 110(4): 1168 - 1177. [Abstract] [Full Text] [PDF] |
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O. Dormond, J. C. Madsen, and D. M. Briscoe The Effects of mTOR-Akt Interactions on Anti-apoptotic Signaling in Vascular Endothelial Cells J. Biol. Chem., August 10, 2007; 282(32): 23679 - 23686. [Abstract] [Full Text] [PDF] |
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P. R. Somanath, E. S. Kandel, N. Hay, and T. V. Byzova Akt1 Signaling Regulates Integrin Activation, Matrix Recognition, and Fibronectin Assembly J. Biol. Chem., August 3, 2007; 282(31): 22964 - 22976. [Abstract] [Full Text] [PDF] |
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A. Albini, D. M. Noonan, and N. Ferrari Molecular Pathways for Cancer Angioprevention Clin. Cancer Res., August 1, 2007; 13(15): 4320 - 4325. [Abstract] [Full Text] [PDF] |
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T. Miyahara, K. Hamanaka, D. S. Weber, D. A. Drake, M. Anghelescu, and J. C. Parker Phosphoinositide 3-kinase, Src, and Akt modulate acute ventilation-induced vascular permeability increases in mouse lungs Am J Physiol Lung Cell Mol Physiol, July 1, 2007; 293(1): L11 - L21. [Abstract] [Full Text] [PDF] |
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H. Younes, X. Leleu, E. Hatjiharissi, A.-S. Moreau, T. Hideshima, P. Richardson, K. C. Anderson, and I. M. Ghobrial Targeting the Phosphatidylinositol 3-Kinase Pathway in Multiple Myeloma Clin. Cancer Res., July 1, 2007; 13(13): 3771 - 3775. [Abstract] [Full Text] [PDF] |
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Y. Zhang, T. S. Park, and J. M. Gidday Hypoxic preconditioning protects human brain endothelium from ischemic apoptosis by Akt-dependent survivin activation Am J Physiol Heart Circ Physiol, June 1, 2007; 292(6): H2573 - H2581. [Abstract] [Full Text] [PDF] |
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Y. Wang, N. Ahmad, B. Wang, and M. Ashraf Chronic preconditioning: a novel approach for cardiac protection Am J Physiol Heart Circ Physiol, May 1, 2007; 292(5): H2300 - H2305. [Abstract] [Full Text] [PDF] |
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S. Jesmin, S. Zaedi, N. Shimojo, M. Iemitsu, K. Masuzawa, N. Yamaguchi, C. N. Mowa, S. Maeda, Y. Hattori, and T. Miyauchi Endothelin antagonism normalizes VEGF signaling and cardiac function in STZ-induced diabetic rat hearts Am J Physiol Endocrinol Metab, April 1, 2007; 292(4): E1030 - E1040. [Abstract] [Full Text] [PDF] |
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Y. Mukai, C.-Y. Wang, Y. Rikitake, and J. K. Liao Phosphatidylinositol 3-kinase/protein kinase Akt negatively regulates plasminogen activator inhibitor type 1 expression in vascular endothelial cells Am J Physiol Heart Circ Physiol, April 1, 2007; 292(4): H1937 - H1942. [Abstract] [Full Text] [PDF] |
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J.-X. Chen, H. Zeng, Q.-H. Tuo, H. Yu, B. Meyrick, and J. L. Aschner NADPH oxidase modulates myocardial Akt, ERK1/2 activation, and angiogenesis after hypoxia-reoxygenation Am J Physiol Heart Circ Physiol, April 1, 2007; 292(4): H1664 - H1674. [Abstract] [Full Text] [PDF] |
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L. Primo, L. di Blasio, C. Roca, S. Droetto, R. Piva, B. Schaffhausen, and F. Bussolino Essential role of PDK1 in regulating endothelial cell migration J. Cell Biol., March 26, 2007; 176(7): 1035 - 1047. [Abstract] [Full Text] [PDF] |
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D. Xiao and S. V. Singh Phenethyl Isothiocyanate Inhibits Angiogenesis In vitro and Ex vivo Cancer Res., March 1, 2007; 67(5): 2239 - 2246. [Abstract] [Full Text] [PDF] |
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Y. Takeda, A. R. Kazarov, C. E. Butterfield, B. D. Hopkins, L. E. Benjamin, A. Kaipainen, and M. E. Hemler Deletion of tetraspanin Cd151 results in decreased pathologic angiogenesis in vivo and in vitro Blood, February 15, 2007; 109(4): 1524 - 1532. [Abstract] [Full Text] [PDF] |
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J.-K. Min, Y.-L. Cho, J.-H. Choi, Y. Kim, J. H. Kim, Y. S. Yu, J. Rho, N. Mochizuki, Y.-M. Kim, G. T. Oh, et al. Receptor activator of nuclear factor (NF)-{kappa}B ligand (RANKL) increases vascular permeability: impaired permeability and angiogenesis in eNOS-deficient mice Blood, February 15, 2007; 109(4): 1495 - 1502. [Abstract] [Full Text] [PDF] |
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C. Guilluy, M. Rolli-Derkinderen, P.-L. Tharaux, G. Melino, P. Pacaud, and G. Loirand Transglutaminase-dependent RhoA Activation and Depletion by Serotonin in Vascular Smooth Muscle Cells J. Biol. Chem., February 2, 2007; 282(5): 2918 - 2928. [Abstract] [Full Text] [PDF] |
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R. Dell'Eva, C. Ambrosini, S. Minghelli, D. M. Noonan, A. Albini, and N. Ferrari The Akt inhibitor deguelin, is an angiopreventive agent also acting on the NF-{kappa}B pathway Carcinogenesis, February 1, 2007; 28(2): 404 - 413. [Abstract] [Full Text] [PDF] |
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K. Takeshita, M. Satoh, M. Ii, M. Silver, F. P. Limbourg, Y. Mukai, Y. Rikitake, F. Radtke, T. Gridley, D. W. Losordo, et al. Critical Role of Endothelial Notch1 Signaling in Postnatal Angiogenesis Circ. Res., January 5, 2007; 100(1): 70 - 78. [Abstract] [Full Text] [PDF] |
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S. Nakata, M. Tsutsui, H. Shimokawa, T. Yamashita, A. Tanimoto, H. Tasaki, K. Ozumi, K. Sabanai, T. Morishita, O. Suda, et al. Statin Treatment Upregulates Vascular Neuronal Nitric Oxide Synthase Through Akt/NF-{kappa}B Pathway Arterioscler Thromb Vasc Biol, January 1, 2007; 27(1): 92 - 98. [Abstract] [Full Text] [PDF] |
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J. B. Samora, J. C. Frisbee, and M. A. Boegehold Growth-dependent changes in endothelial factors regulating arteriolar tone Am J Physiol Heart Circ Physiol, January 1, 2007; 292(1): H207 - H214. [Abstract] [Full Text] [PDF] |
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I. Shiojima and K. Walsh Regulation of cardiac growth and coronary angiogenesis by the Akt/PKB signaling pathway Genes & Dev., December 15, 2006; 20(24): 3347 - 3365. [Abstract] [Full Text] [PDF] |
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M. Boodhwani, S. Mieno, P. Voisine, J. Feng, N. Sodha, J. Li, and F. W. Sellke High-dose atorvastatin is associated with impaired myocardial angiogenesis in response to vascular endothelial growth factor in hypercholesterolemic swine J. Thorac. Cardiovasc. Surg., December 1, 2006; 132(6): 1299 - 1306. [Abstract] [Full Text] [PDF] |
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S. Mieno, M. Boodhwani, R. T. Clements, B. Ramlawi, N. R. Sodha, J. Li, and F. W. Sellke Aging is associated with an impaired coronary microvascular response to vascular endothelial growth factor in patients J. Thorac. Cardiovasc. Surg., December 1, 2006; 132(6): 1348 - 1355. [Abstract] [Full Text] [PDF] |
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G. Hu, J. Tang, B. Zhang, Y. Lin, J.-i. Hanai, J. Galloway, V. Bedell, N. Bahary, Z. Han, R. Ramchandran, et al. A novel endothelial-specific heat shock protein HspA12B is required in both zebrafish development and endothelial functions in vitro J. Cell Sci., October 1, 2006; 119(19): 4117 - 4126. [Abstract] [Full Text] [PDF] |
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K. R. Brunt, K. K. Fenrich, G. Kiani, M. Yat Tse, S. C. Pang, C. A. Ward, and L. G. Melo Protection of Human Vascular Smooth Muscle Cells From H2O2-Induced Apoptosis Through Functional Codependence Between HO-1 and AKT Arterioscler Thromb Vasc Biol, September 1, 2006; 26(9): 2027 - 2034. [Abstract] [Full Text] [PDF] |
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C. J. Lowenstein Integrin-Linked Kinase Plays a Key Role in Coxsackievirus Replication Circ. Res., August 18, 2006; 99(4): 346 - 347. [Full Text] [PDF] |
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R. D. Balsara, F. J. Castellino, and V. A. Ploplis A Novel Function of Plasminogen Activator Inhibitor-1 in Modulation of the AKT Pathway in Wild-type and Plasminogen Activator Inhibitor-1-deficient Endothelial Cells J. Biol. Chem., August 11, 2006; 281(32): 22527 - 22536. [Abstract] [Full Text] [PDF] |
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M. Dance, A. Montagner, A. Yart, B. Masri, Y. Audigier, B. Perret, J.-P. Salles, and P. Raynal The Adaptor Protein Gab1 Couples the Stimulation of Vascular Endothelial Growth Factor Receptor-2 to the Activation of Phosphoinositide 3-Kinase J. Biol. Chem., August 11, 2006; 281(32): 23285 - 23295. [Abstract] [Full Text] [PDF] |
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Q. Wei and Y. Xia Proteasome Inhibition Down-regulates Endothelial Nitric-oxide Synthase Phosphorylation and Function J. Biol. Chem., August 4, 2006; 281(31): 21652 - 21659. [Abstract] [Full Text] [PDF] |
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J. Fitau, G. Boulday, F. Coulon, T. Quillard, and B. Charreau The Adaptor Molecule Lnk Negatively Regulates Tumor Necrosis Factor-{alpha}-dependent VCAM-1 Expression in Endothelial Cells through Inhibition of the ERK1 and -2 Pathways J. Biol. Chem., July 21, 2006; 281(29): 20148 - 20159. [Abstract] [Full Text] [PDF] |
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M. Boodhwani, Y. Nakai, P. Voisine, J. Feng, J. Li, S. Mieno, B. Ramlawi, C. Bianchi, R. Laham, and F. W. Sellke High-Dose Atorvastatin Improves Hypercholesterolemic Coronary Endothelial Dysfunction Without Improving the Angiogenic Response Circulation, July 4, 2006; 114(1_suppl): I-402 - I-408. [Abstract] [Full Text] [PDF] |
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N. Ahmad, Y. Wang, K. H. Haider, B. Wang, Z. Pasha, O. Uzun, and M. Ashraf Cardiac protection by mitoKATP channels is dependent on Akt translocation from cytosol to mitochondria during late preconditioning Am J Physiol Heart Circ Physiol, June 1, 2006; 290(6): H2402 - H2408. [Abstract] [Full Text] [PDF] |
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X. Du, I. Kristiana, J. Wong, and A. J. Brown Involvement of Akt in ER-to-Golgi Transport of SCAP/SREBP: A Link between a Key Cell Proliferative Pathway and Membrane Synthesis Mol. Biol. Cell, June 1, 2006; 17(6): 2735 - 2745. [Abstract] [Full Text] [PDF] |
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Y. Izumiya, I. Shiojima, K. Sato, D. B. Sawyer, W. S. Colucci, and K. Walsh Vascular Endothelial Growth Factor Blockade Promotes the Transition From Compensatory Cardiac Hypertrophy to Failure in Response to Pressure Overload Hypertension, May 1, 2006; 47(5): 887 - 893. [Abstract] [Full Text] [PDF] |
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S. W. Ryter, J. Alam, and A. M. K. Choi Heme Oxygenase-1/Carbon Monoxide: From Basic Science to Therapeutic Applications Physiol Rev, April 1, 2006; 86(2): 583 - 650. [Abstract] [Full Text] [PDF] |
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K. Nishimura, W. Li, Y. Hoshino, T. Kadohama, H. Asada, S. Ohgi, and B. E. Sumpio Role of AKT in cyclic strain-induced endothelial cell proliferation and survival Am J Physiol Cell Physiol, March 1, 2006; 290(3): C812 - C821. [Abstract] [Full Text] [PDF] |
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H. Hasegawa, H. Takano, K. Iwanaga, M. Ohtsuka, Y. Qin, Y. Niitsuma, K. Ueda, T. Toyoda, H. Tadokoro, and I. Komuro Cardioprotective Effects of Granulocyte Colony-Stimulating Factor in Swine With Chronic Myocardial Ischemia J. Am. Coll. Cardiol., February 21, 2006; 47(4): 842 - 849. [Abstract] [Full Text] [PDF] |
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K. Benkirane, F. Amiri, Q. N. Diep, M. El Mabrouk, and E. L. Schiffrin PPAR-{gamma} inhibits ANG II-induced cell growth via SHIP2 and 4E-BP1 Am J Physiol Heart Circ Physiol, January 1, 2006; 290(1): H390 - H397. [Abstract] [Full Text] [PDF] |
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K. Benkirane, E. C. Viel, F. Amiri, and E. L. Schiffrin Peroxisome Proliferator-Activated Receptor {gamma} Regulates Angiotensin II-Stimulated Phosphatidylinositol 3-Kinase and Mitogen-Activated Protein Kinase in Blood Vessels In Vivo Hypertension, January 1, 2006; 47(1): 102 - 108. [Abstract] [Full Text] [PDF] |
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F. Li, C. Zhang, S. Schaefer, A. Estes, and K. U. Malik ANG II-induced neointimal growth is mediated via cPLA2- and PLD2-activated Akt in balloon-injured rat carotid artery Am J Physiol Heart Circ Physiol, December 1, 2005; 289(6): H2592 - H2601. [Abstract] [Full Text] [PDF] |
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S. J. Holland, M. J. Powell, C. Franci, E. W. Chan, A. M. Friera, R. E. Atchison, J. McLaughlin, S. E. Swift, E. S. Pali, G. Yam, et al. Multiple Roles for the Receptor Tyrosine Kinase Axl in Tumor Formation Cancer Res., October 15, 2005; 65(20): 9294 - 9303. [Abstract] [Full Text] [PDF] |
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T. Watanabe, J. Suzuki, H. Yamawaki, V. K. Sharma, S.-S. Sheu, and B. C. Berk Losartan Metabolite EXP3179 Activates Akt and Endothelial Nitric Oxide Synthase via Vascular Endothelial Growth Factor Receptor-2 in Endothelial Cells: Angiotensin II Type 1 Receptor-Independent Effects of EXP3179 Circulation, September 20, 2005; 112(12): 1798 - 1805. [Abstract] [Full Text] [PDF] |
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M. Li, K.-R. Chiou, A. Bugayenko, K. Irani, and D. A. Kass Reduced Wall Compliance Suppresses Akt-Dependent Apoptosis Protection Stimulated by Pulse Perfusion Circ. Res., September 16, 2005; 97(6): 587 - 595. [Abstract] [Full Text] [PDF] |
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T. Maffucci, E. Piccolo, A. Cumashi, M. Iezzi, A. M. Riley, A. Saiardi, H. Y. Godage, C. Rossi, M. Broggini, S. Iacobelli, et al. Inhibition of the Phosphatidylinositol 3-Kinase/Akt Pathway by Inositol Pentakisphosphate Results in Antiangiogenic and Antitumor Effects Cancer Res., September 15, 2005; 65(18): 8339 - 8349. [Abstract] [Full Text] [PDF] |
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F. C. Sasso, D. Torella, O. Carbonara, G. M. Ellison, M. Torella, M. Scardone, C. Marra, R. Nasti, R. Marfella, D. Cozzolino, et al. Increased Vascular Endothelial Growth Factor Expression But Impaired Vascular Endothelial Growth Factor Receptor Signaling in the Myocardium of Type 2 Diabetic Patients With Chronic Coronary Heart Disease J. Am. Coll. Cardiol., September 6, 2005; 46(5): 827 - 834. [Abstract] [Full Text] [PDF] |
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S. Murakami, N. Nagaya, T. Itoh, T. Iwase, T. Fujisato, K. Nishioka, K. Hamada, K. Kangawa, and H. Kimura Adrenomedullin Regenerates Alveoli and Vasculature in Elastase-induced Pulmonary Emphysema in Mice Am. J. Respir. Crit. Care Med., September 1, 2005; 172(5): 581 - 589. [Abstract] [Full Text] [PDF] |
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K. Hamada, T. Sasaki, P. A. Koni, M. Natsui, H. Kishimoto, J. Sasaki, N. Yajima, Y. Horie, G. Hasegawa, M. Naito, et al. The PTEN/PI3K pathway governs normal vascular development and tumor angiogenesis Genes & Dev., September 1, 2005; 19(17): 2054 - 2065. [Abstract] [Full Text] [PDF] |
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M.-T. Huang, J. C. Mason, G. M. Birdsey, V. Amsellem, N. Gerwin, D. O. Haskard, A. J. Ridley, and A. M. Randi Endothelial intercellular adhesion molecule (ICAM)-2 regulates angiogenesis Blood, September 1, 2005; 106(5): 1636 - 1643. [Abstract] [Full Text] [PDF] |
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M. Eto, A. Kouroedov, F. Cosentino, and T. F. Luscher Glycogen Synthase Kinase-3 Mediates Endothelial Cell Activation by Tumor Necrosis Factor-{alpha} Circulation, August 30, 2005; 112(9): 1316 - 1322. [Abstract] [Full Text] [PDF] |
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H. S. Rugo, R. S. Herbst, G. Liu, J. W. Park, M. S. Kies, H. M. Steinfeldt, Y. K. Pithavala, S. D. Reich, J. L. Freddo, and G. Wilding Phase I Trial of the Oral Antiangiogenesis Agent AG-013736 in Patients With Advanced Solid Tumors: Pharmacokinetic and Clinical Results J. Clin. Oncol., August 20, 2005; 23(24): 5474 - 5483. [Abstract] [Full Text] [PDF] |
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H. Hu, C. Jiang, G. Li, and J. Lu PKB/AKT and ERK regulation of caspase-mediated apoptosis by methylseleninic acid in LNCaP prostate cancer cells Carcinogenesis, August 1, 2005; 26(8): 1374 - 1381. [Abstract] [Full Text] [PDF] |
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K. D. Puri, T. A. Doggett, C.-Y. Huang, J. Douangpanya, J. S. Hayflick, M. Turner, J. Penninger, and T. G. Diacovo The role of endothelial PI3K{gamma} activity in neutrophil trafficking Blood, July 1, 2005; 106(1): 150 - 157. [Abstract] [Full Text] [PDF] |
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D. A. Kass Ventricular Arterial Stiffening: Integrating the Pathophysiology Hypertension, July 1, 2005; 46(1): 185 - 193. [Abstract] [Full Text] [PDF] |
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J. P. Huddleson, N. Ahmad, S. Srinivasan, and J. B Lingrel Induction of KLF2 by Fluid Shear Stress Requires a Novel Promoter Element Activated by a Phosphatidylinositol 3-Kinase-dependent Chromatin-remodeling Pathway J. Biol. Chem., June 17, 2005; 280(24): 23371 - 23379. [Abstract] [Full Text] [PDF] |
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R. I. Feldman, J. M. Wu, M. A. Polokoff, M. J. Kochanny, H. Dinter, D. Zhu, S. L. Biroc, B. Alicke, J. Bryant, S. Yuan, et al. Novel Small Molecule Inhibitors of 3-Phosphoinositide-dependent Kinase-1 J. Biol. Chem., May 20, 2005; 280(20): 19867 - 19874. [Abstract] [Full Text] [PDF] |
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S. J. Zieman, V. Melenovsky, and D. A. Kass Mechanisms, Pathophysiology, and Therapy of Arterial Stiffness Arterioscler Thromb Vasc Biol, May 1, 2005; 25(5): 932 - 943. [Abstract] [Full Text] [PDF] |
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F. Li and K. U. Malik Angiotensin II-induced Akt activation is mediated by metabolites of arachidonic acid generated by CaMKII-stimulated Ca2+-dependent phospholipase A2 Am J Physiol Heart Circ Physiol, May 1, 2005; 288(5): H2306 - H2316. [Abstract] [Full Text] [PDF] |
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V. Limaye, X. Li, C. Hahn, P. Xia, M. C. Berndt, M. A. Vadas, and J. R. Gamble Sphingosine kinase-1 enhances endothelial cell survival through a PECAM-1-dependent activation of PI-3K/Akt and regulation of Bcl-2 family members Blood, April 15, 2005; 105(8): 3169 - 3177. [Abstract] [Full Text] [PDF] |
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F. Li and K. U. Malik Angiotensin II-Induced Akt Activation through the Epidermal Growth Factor Receptor in Vascular Smooth Muscle Cells Is Mediated by Phospholipid Metabolites Derived by Activation of Phospholipase D J. Pharmacol. Exp. Ther., March 1, 2005; 312(3): 1043 - 1054. [Abstract] [Full Text] [PDF] |
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T. Fujii, N. Nagaya, T. Iwase, S. Murakami, Y. Miyahara, K. Nishigami, H. Ishibashi-Ueda, M. Shirai, T. Itoh, K. Ishino, et al. Adrenomedullin enhances therapeutic potency of bone marrow transplantation for myocardial infarction in rats Am J Physiol Heart Circ Physiol, March 1, 2005; 288(3): H1444 - H1450. [Abstract] [Full Text] [PDF] |
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C. Skurk, H. Maatz, E. Rocnik, A. Bialik, T. Force, and K. Walsh Glycogen-Synthase Kinase3{beta}/{beta}-Catenin Axis Promotes Angiogenesis Through Activation of Vascular Endothelial Growth Factor Signaling in Endothelial Cells Circ. Res., February 18, 2005; 96(3): 308 - 318. [Abstract] [Full Text] [PDF] |
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M. Bosch-Marce, R. Pola, A. B Wecker, M. Silver, A. Weber, C. Luedemann, C. Curry, T. Murayama, M. Kearney, Y.-s. Yoon, et al. Hyperhomocyst(e)inemia impairs angiogenesis in a murine model of limb ischemia Vascular Medicine, February 1, 2005; 10(1): 15 - 22. [Abstract] [PDF] |
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