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Wang Q, Shu C, Su J, Li X. A crosstalk triggered by hypoxia and maintained by MCP-1/miR-98/IL-6/p38 regulatory loop between human aortic smooth muscle cells and macrophages leads to aortic smooth muscle cells apoptosis via Stat1 activation. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2015; 8:2670-2679. [PMID: 26045772 PMCID: PMC4440081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Accepted: 02/21/2015] [Indexed: 06/04/2023]
Abstract
Hypoxia and inflammation are central characteristics of the abdominal aortic aneurysm (AAA), but the mechanisms for their relationship and actual role remain far from full understood. Here, we showed MCP-1 (monocyte chemotactic protein-1) induced by hypoxia in primary human Aortic Smooth Muscle Cells (hASMCs) increased the chemotaxis of THP-1 macrophages and MCP-1 induced IL-6 expression in THP-1 cells via downregulating miR-98 which directly targets IL-6. In addition, IL-6 positively feedback regulated MCP-1 expression in hASMCs via p38 signal that is independent on hypoxia, and inhibition of p38 signal blocked the effect of IL-6 on MCP-1 expression regulation. Moreover, IL-6 exposure time-dependently induces phASMCs apoptosis via Stat1 activation. Collectively, our data provide compelling evidence on the association between hypoxia and inflammation triggered by hypoxia and then mediated by MCP-1/miR-98/IL-6/p38 regulatory loop, which leads to hASMCs apoptosis via Stat1 activation to contribute to AAA formation and progression.
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MESH Headings
- Aorta/metabolism
- Aorta/pathology
- Aortic Aneurysm, Abdominal/metabolism
- Aortic Aneurysm, Abdominal/pathology
- Apoptosis/physiology
- Blotting, Western
- Cell Hypoxia
- Cells, Cultured
- Chemokine CCL2/metabolism
- Enzyme-Linked Immunosorbent Assay
- Humans
- Interleukin-6/metabolism
- MAP Kinase Signaling System/physiology
- Macrophages/metabolism
- MicroRNAs/metabolism
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Real-Time Polymerase Chain Reaction
- Receptor Cross-Talk/physiology
- STAT1 Transcription Factor/metabolism
- Transfection
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Affiliation(s)
- Qing Wang
- Department of Vascular Surgery, The 2 Xiangya Hospital, Central South University139 Renmin Middle Road, Changsha 410011, Hunan, People’s Republic of China
| | - Chang Shu
- Department of Vascular Surgery, The 2 Xiangya Hospital, Central South University139 Renmin Middle Road, Changsha 410011, Hunan, People’s Republic of China
| | - Jing Su
- Hunan Tumor HospitalChangsha, Hunan, People’s Republic of China
| | - Xin Li
- Department of Vascular Surgery, The 2 Xiangya Hospital, Central South University139 Renmin Middle Road, Changsha 410011, Hunan, People’s Republic of China
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52
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Obama T, Takayanagi T, Kobayashi T, Bourne AM, Elliott KJ, Charbonneau M, Dubois CM, Eguchi S. Vascular induction of a disintegrin and metalloprotease 17 by angiotensin II through hypoxia inducible factor 1α. Am J Hypertens 2015; 28:10-4. [PMID: 24871629 DOI: 10.1093/ajh/hpu094] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND A disintegrin and metalloprotease 17 (ADAM17) is a membrane-spanning metalloprotease overexpressed in various cardiovascular diseases such as hypertension and atherosclerosis. However, little is known regarding the regulation of ADAM17 expression in the cardiovascular system. Here, we test our hypothesis that angiotensin II induces ADAM17 expression in the vasculature. METHODS Cultured vascular smooth muscle cells were stimulated with 100 nM angiotensin II. Mice were infused with 1 μg/kg/minute angiotensin II for 2 weeks. ADAM17 expression was evaluated by a promoter-reporter construct, quantitative polymerase chain reaction, immunoblotting, and immunohistochemistry. RESULTS In vascular smooth muscle cells, angiotensin II increased ADAM17 protein expression, mRNA, and promoter activity. We determined that the angiotensin II response involves hypoxia inducible factor 1α and a hypoxia responsive element. In angiotensin II-infused mice, marked induction of ADAM17 and hypoxia inducible factor 1α was seen in vasculatures in heart and kidney, as well as in aortae, by immunohistochemistry. CONCLUSIONS Angiotensin II induces ADAM17 expression in the vasculatures through a hypoxia inducible factor 1α-dependent transcriptional upregulation, potentially contributing to end-organ damage in the cardiovascular system.
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MESH Headings
- ADAM Proteins/genetics
- ADAM Proteins/metabolism
- ADAM17 Protein
- Angiotensin II/pharmacology
- Animals
- Cells, Cultured
- Hypoxia-Inducible Factor 1, alpha Subunit/metabolism
- Male
- Mice, Inbred C57BL
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/enzymology
- Myocytes, Smooth Muscle
- Promoter Regions, Genetic
- RNA, Messenger/metabolism
- Rats, Sprague-Dawley
- Signal Transduction/drug effects
- Time Factors
- Up-Regulation
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Affiliation(s)
- Takashi Obama
- Cardiovascular Research Center and Department of Physiology, Temple University School of Medicine, Philadelphia, Pennsylvania
| | - Takehiko Takayanagi
- Cardiovascular Research Center and Department of Physiology, Temple University School of Medicine, Philadelphia, Pennsylvania
| | - Tomonori Kobayashi
- Cardiovascular Research Center and Department of Physiology, Temple University School of Medicine, Philadelphia, Pennsylvania
| | - Allison M Bourne
- Cardiovascular Research Center and Department of Physiology, Temple University School of Medicine, Philadelphia, Pennsylvania
| | - Katherine J Elliott
- Cardiovascular Research Center and Department of Physiology, Temple University School of Medicine, Philadelphia, Pennsylvania
| | - Martine Charbonneau
- Immunology Division, Department of Pediatrics, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Claire M Dubois
- Immunology Division, Department of Pediatrics, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Satoru Eguchi
- Cardiovascular Research Center and Department of Physiology, Temple University School of Medicine, Philadelphia, Pennsylvania;
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53
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Trachet B, Fraga-Silva RA, Piersigilli A, Tedgui A, Sordet-Dessimoz J, Astolfo A, Van der Donckt C, Modregger P, Stampanoni MFM, Segers P, Stergiopulos N. Dissecting abdominal aortic aneurysm in Ang II-infused mice: suprarenal branch ruptures and apparent luminal dilatation. Cardiovasc Res 2014; 105:213-22. [DOI: 10.1093/cvr/cvu257] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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Peña-Silva RA, Chalouhi N, Wegman-Points L, Ali M, Mitchell I, Pierce GL, Chu Y, Ballas ZK, Heistad D, Hasan D. Novel role for endogenous hepatocyte growth factor in the pathogenesis of intracranial aneurysms. Hypertension 2014; 65:587-93. [PMID: 25510828 DOI: 10.1161/hypertensionaha.114.04681] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Inflammation plays a key role in formation and rupture of intracranial aneurysms. Because hepatocyte growth factor (HGF) protects against vascular inflammation, we sought to assess the role of endogenous HGF in the pathogenesis of intracranial aneurysms. Circulating HGF concentrations in blood samples drawn from the lumen of human intracranial aneurysms or femoral arteries were compared in 16 patients. Tissue from superficial temporal arteries and ruptured or unruptured intracranial aneurysms collected from patients undergoing clipping (n=10) were immunostained with antibodies to HGF and its receptor c-Met. Intracranial aneurysms were induced in mice treated with PF-04217903 (a c-Met antagonist) or vehicle. Expression of inflammatory molecules was also measured in cultured human endothelial, smooth muscle cells and monocytes treated with lipopolysaccharides in presence or absence of HGF and PF-04217903. We found that HGF concentrations were significantly higher in blood collected from human intracranial aneurysms (1076±656 pg/mL) than in femoral arteries (196±436 pg/mL; P<0.001). HGF and c-Met were detected by immunostaining in superficial temporal arteries and in both ruptured and unruptured human intracranial aneurysms. A c-Met antagonist did not alter the formation of intracranial aneurysms (P>0.05), but significantly increased the prevalence of subarachnoid hemorrhage and decreased survival in mice (P<0.05). HGF attenuated expression of vascular cell adhesion molecule-1 (P<0.05) and E-Selectin (P<0.05) in human aortic endothelial cells. In conclusion, plasma HGF concentrations are elevated in intracranial aneurysms. HGF and c-Met are expressed in superficial temporal arteries and in intracranial aneurysms. HGF signaling through c-Met may decrease inflammation in endothelial cells and protect against intracranial aneurysm rupture.
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Affiliation(s)
- Ricardo A Peña-Silva
- From the Departments of Pharmacology and Neurosurgery, Medical School, Universidad de los Andes, Bogotá, Colombia (R.A.P.-S.); Department of Neurosurgery, Thomas Jefferson University School of Medicine, Philadelphia, PA (N.C.); Department of Health and Human Physiology, University of Iowa, Iowa City (L.W.-P., G.L.P.); Departments of Neurosurgery (M.A., I.M., Y.C., D. Hasan) and Medicine (Y.C., Z.K.B., D. Heistad), University of Iowa Carver College of Medicine, Iowa City; and Department of Medicine, VA Medical Center, Iowa City, IA (Z.K.B.)
| | - Nohra Chalouhi
- From the Departments of Pharmacology and Neurosurgery, Medical School, Universidad de los Andes, Bogotá, Colombia (R.A.P.-S.); Department of Neurosurgery, Thomas Jefferson University School of Medicine, Philadelphia, PA (N.C.); Department of Health and Human Physiology, University of Iowa, Iowa City (L.W.-P., G.L.P.); Departments of Neurosurgery (M.A., I.M., Y.C., D. Hasan) and Medicine (Y.C., Z.K.B., D. Heistad), University of Iowa Carver College of Medicine, Iowa City; and Department of Medicine, VA Medical Center, Iowa City, IA (Z.K.B.)
| | - Lauren Wegman-Points
- From the Departments of Pharmacology and Neurosurgery, Medical School, Universidad de los Andes, Bogotá, Colombia (R.A.P.-S.); Department of Neurosurgery, Thomas Jefferson University School of Medicine, Philadelphia, PA (N.C.); Department of Health and Human Physiology, University of Iowa, Iowa City (L.W.-P., G.L.P.); Departments of Neurosurgery (M.A., I.M., Y.C., D. Hasan) and Medicine (Y.C., Z.K.B., D. Heistad), University of Iowa Carver College of Medicine, Iowa City; and Department of Medicine, VA Medical Center, Iowa City, IA (Z.K.B.)
| | - Muhammad Ali
- From the Departments of Pharmacology and Neurosurgery, Medical School, Universidad de los Andes, Bogotá, Colombia (R.A.P.-S.); Department of Neurosurgery, Thomas Jefferson University School of Medicine, Philadelphia, PA (N.C.); Department of Health and Human Physiology, University of Iowa, Iowa City (L.W.-P., G.L.P.); Departments of Neurosurgery (M.A., I.M., Y.C., D. Hasan) and Medicine (Y.C., Z.K.B., D. Heistad), University of Iowa Carver College of Medicine, Iowa City; and Department of Medicine, VA Medical Center, Iowa City, IA (Z.K.B.)
| | - Ian Mitchell
- From the Departments of Pharmacology and Neurosurgery, Medical School, Universidad de los Andes, Bogotá, Colombia (R.A.P.-S.); Department of Neurosurgery, Thomas Jefferson University School of Medicine, Philadelphia, PA (N.C.); Department of Health and Human Physiology, University of Iowa, Iowa City (L.W.-P., G.L.P.); Departments of Neurosurgery (M.A., I.M., Y.C., D. Hasan) and Medicine (Y.C., Z.K.B., D. Heistad), University of Iowa Carver College of Medicine, Iowa City; and Department of Medicine, VA Medical Center, Iowa City, IA (Z.K.B.)
| | - Gary L Pierce
- From the Departments of Pharmacology and Neurosurgery, Medical School, Universidad de los Andes, Bogotá, Colombia (R.A.P.-S.); Department of Neurosurgery, Thomas Jefferson University School of Medicine, Philadelphia, PA (N.C.); Department of Health and Human Physiology, University of Iowa, Iowa City (L.W.-P., G.L.P.); Departments of Neurosurgery (M.A., I.M., Y.C., D. Hasan) and Medicine (Y.C., Z.K.B., D. Heistad), University of Iowa Carver College of Medicine, Iowa City; and Department of Medicine, VA Medical Center, Iowa City, IA (Z.K.B.)
| | - Yi Chu
- From the Departments of Pharmacology and Neurosurgery, Medical School, Universidad de los Andes, Bogotá, Colombia (R.A.P.-S.); Department of Neurosurgery, Thomas Jefferson University School of Medicine, Philadelphia, PA (N.C.); Department of Health and Human Physiology, University of Iowa, Iowa City (L.W.-P., G.L.P.); Departments of Neurosurgery (M.A., I.M., Y.C., D. Hasan) and Medicine (Y.C., Z.K.B., D. Heistad), University of Iowa Carver College of Medicine, Iowa City; and Department of Medicine, VA Medical Center, Iowa City, IA (Z.K.B.)
| | - Zuhair K Ballas
- From the Departments of Pharmacology and Neurosurgery, Medical School, Universidad de los Andes, Bogotá, Colombia (R.A.P.-S.); Department of Neurosurgery, Thomas Jefferson University School of Medicine, Philadelphia, PA (N.C.); Department of Health and Human Physiology, University of Iowa, Iowa City (L.W.-P., G.L.P.); Departments of Neurosurgery (M.A., I.M., Y.C., D. Hasan) and Medicine (Y.C., Z.K.B., D. Heistad), University of Iowa Carver College of Medicine, Iowa City; and Department of Medicine, VA Medical Center, Iowa City, IA (Z.K.B.)
| | - Donald Heistad
- From the Departments of Pharmacology and Neurosurgery, Medical School, Universidad de los Andes, Bogotá, Colombia (R.A.P.-S.); Department of Neurosurgery, Thomas Jefferson University School of Medicine, Philadelphia, PA (N.C.); Department of Health and Human Physiology, University of Iowa, Iowa City (L.W.-P., G.L.P.); Departments of Neurosurgery (M.A., I.M., Y.C., D. Hasan) and Medicine (Y.C., Z.K.B., D. Heistad), University of Iowa Carver College of Medicine, Iowa City; and Department of Medicine, VA Medical Center, Iowa City, IA (Z.K.B.)
| | - David Hasan
- From the Departments of Pharmacology and Neurosurgery, Medical School, Universidad de los Andes, Bogotá, Colombia (R.A.P.-S.); Department of Neurosurgery, Thomas Jefferson University School of Medicine, Philadelphia, PA (N.C.); Department of Health and Human Physiology, University of Iowa, Iowa City (L.W.-P., G.L.P.); Departments of Neurosurgery (M.A., I.M., Y.C., D. Hasan) and Medicine (Y.C., Z.K.B., D. Heistad), University of Iowa Carver College of Medicine, Iowa City; and Department of Medicine, VA Medical Center, Iowa City, IA (Z.K.B.).
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Azevedo H, Fujita A, Bando SY, Iamashita P, Moreira-Filho CA. Transcriptional network analysis reveals that AT1 and AT2 angiotensin II receptors are both involved in the regulation of genes essential for glioma progression. PLoS One 2014; 9:e110934. [PMID: 25365520 PMCID: PMC4217762 DOI: 10.1371/journal.pone.0110934] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 09/26/2014] [Indexed: 01/25/2023] Open
Abstract
Gliomas are aggressive primary brain tumors with high infiltrative potential. The expression of Angiotensin II (Ang II) receptors has been associated with poor prognosis in human astrocytomas, the most common type of glioma. In this study, we investigated the role of Angiotensin II in glioma malignancy through transcriptional profiling and network analysis of cultured C6 rat glioma cells exposed to Ang II and to inhibitors of its membrane receptor subtypes. C6 cells were treated with Ang II and specific antagonists of AT1 and AT2 receptors. Total RNA was isolated after three and six hours of Ang II treatment and analyzed by oligonucleotide microarray technology. Gene expression data was evaluated through transcriptional network modeling to identify how differentially expressed (DE) genes are connected to each other. Moreover, other genes co-expressing with the DE genes were considered in these analyses in order to support the identification of enriched functions and pathways. A hub-based network analysis showed that the most connected nodes in Ang II-related networks exert functions associated with cell proliferation, migration and invasion, key aspects for glioma progression. The subsequent functional enrichment analysis of these central genes highlighted their participation in signaling pathways that are frequently deregulated in gliomas such as ErbB, MAPK and p53. Noteworthy, either AT1 or AT2 inhibitions were able to down-regulate different sets of hub genes involved in protumoral functions, suggesting that both Ang II receptors could be therapeutic targets for intervention in glioma. Taken together, our results point out multiple actions of Ang II in glioma pathogenesis and reveal the participation of both Ang II receptors in the regulation of genes relevant for glioma progression. This study is the first one to provide systems-level molecular data for better understanding the protumoral effects of Ang II in the proliferative and infiltrative behavior of gliomas.
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Affiliation(s)
- Hátylas Azevedo
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
| | - André Fujita
- Department of Computer Science, Instituto de Matemática e Estatística, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Silvia Yumi Bando
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
| | - Priscila Iamashita
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
| | - Carlos Alberto Moreira-Filho
- Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
- * E-mail:
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56
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miR-24 limits aortic vascular inflammation and murine abdominal aneurysm development. Nat Commun 2014; 5:5214. [PMID: 25358394 PMCID: PMC4217126 DOI: 10.1038/ncomms6214] [Citation(s) in RCA: 169] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 09/10/2014] [Indexed: 12/19/2022] Open
Abstract
Identification and treatment of abdominal aortic aneurysm (AAA) remain among the most prominent challenges in vascular medicine. MicroRNAs (miRNAs) are crucial regulators of cardiovascular pathology and represent intriguing targets to limit AAA expansion. Here we show, by using two established murine models of AAA disease along with human aortic tissue and plasma analysis, that miR-24 is a key regulator of vascular inflammation and AAA pathology. In vivo and in vitro studies reveal chitinase 3-like 1 (Chi3l1) to be a major target and effector under the control of miR-24, regulating cytokine synthesis in macrophages as well as their survival, promoting aortic smooth muscle cell migration and cytokine production, and stimulating adhesion molecule expression in vascular endothelial cells. We further show that modulation of miR-24 alters AAA progression in animal models, and that miR-24 and CHI3L1 represent novel plasma biomarkers of AAA disease progression in humans. Abdominal aortic aneurysm (AAA) is a potentially fatal and often asymptomatic disease whose causes remain unclear. Here the authors show that a microRNA, miR-24, and its target, the glycoprotein chitinase 3-like 1, represent key regulators of AAA development.
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57
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Moxon JV, Liu D, Moran CS, Crossman DJ, Krishna SM, Yonglitthipagon P, Emeto TI, Morris DR, Padula MP, Mulvenna JP, Rush CM, Golledge J. Proteomic and genomic analyses suggest the association of apolipoprotein C1 with abdominal aortic aneurysm. Proteomics Clin Appl 2014; 8:762-72. [DOI: 10.1002/prca.201300119] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 01/23/2014] [Accepted: 01/27/2014] [Indexed: 12/15/2022]
Affiliation(s)
- Joseph V. Moxon
- Vascular Biology Unit; Queensland Research Centre for Peripheral Vascular Disease; School of Medicine and Dentistry; James Cook University; Townsville Australia
| | - Dawei Liu
- Vascular Biology Unit; Queensland Research Centre for Peripheral Vascular Disease; School of Medicine and Dentistry; James Cook University; Townsville Australia
| | - Corey S. Moran
- Vascular Biology Unit; Queensland Research Centre for Peripheral Vascular Disease; School of Medicine and Dentistry; James Cook University; Townsville Australia
| | - David J. Crossman
- Faculty of Medical and Health Sciences; Department of Physiology; the University of Auckland; Auckland New Zealand
| | - Smriti M. Krishna
- Vascular Biology Unit; Queensland Research Centre for Peripheral Vascular Disease; School of Medicine and Dentistry; James Cook University; Townsville Australia
| | | | - Theophilus I. Emeto
- Vascular Biology Unit; Queensland Research Centre for Peripheral Vascular Disease; School of Medicine and Dentistry; James Cook University; Townsville Australia
- Microbiology and Immunology Department; School of Veterinary and Biomedical Sciences; James Cook University; Townsville Australia
| | - Dylan R. Morris
- Vascular Biology Unit; Queensland Research Centre for Peripheral Vascular Disease; School of Medicine and Dentistry; James Cook University; Townsville Australia
| | - Matthew P. Padula
- Proteomics Core Facility; University of Technology; Sydney Australia
| | - Jason P. Mulvenna
- Infectious Disease and Cancer; QIMR Berghofer Medical Research Institute; Brisbane Australia
| | - Catherine M. Rush
- Vascular Biology Unit; Queensland Research Centre for Peripheral Vascular Disease; School of Medicine and Dentistry; James Cook University; Townsville Australia
- Microbiology and Immunology Department; School of Veterinary and Biomedical Sciences; James Cook University; Townsville Australia
| | - Jonathan Golledge
- Vascular Biology Unit; Queensland Research Centre for Peripheral Vascular Disease; School of Medicine and Dentistry; James Cook University; Townsville Australia
- Department of Vascular and Endovascular Surgery; The Townsville Hospital; Townsville Australia
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58
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Caveolin 1 is critical for abdominal aortic aneurysm formation induced by angiotensin II and inhibition of lysyl oxidase. Clin Sci (Lond) 2014; 126:785-94. [PMID: 24329494 DOI: 10.1042/cs20130660] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Although AngII (angiotensin II) and its receptor AT1R (AngII type 1 receptor) have been implicated in AAA (abdominal aortic aneurysm) formation, the proximal signalling events primarily responsible for AAA formation remain uncertain. Caveolae are cholesterol-rich membrane microdomains that serve as a signalling platform to facilitate the temporal and spatial localization of signal transduction events, including those stimulated by AngII. Cav1 (caveolin 1)-enriched caveolae in vascular smooth muscle cells mediate ADAM17 (a disintegrin and metalloproteinase 17)-dependent EGFR (epidermal growth factor receptor) transactivation, which is linked to vascular remodelling induced by AngII. In the present study, we have tested our hypothesis that Cav1 plays a critical role for the development of AAA at least in part via its specific alteration of AngII signalling within caveolae. Cav1-/- mice and the control wild-type mice were co-infused with AngII and β-aminopropionitrile to induce AAA. We found that Cav1-/- mice with the co-infusion did not develop AAA compared with control mice in spite of hypertension. We found an increased expression of ADAM17 and enhanced phosphorylation of EGFR in AAA. These events were markedly attenuated in Cav1-/- aortas with the co-infusion. Furthermore, aortas from Cav1-/- mice with the co-infusion showed less endoplasmic reticulum stress, oxidative stress and inflammatory responses compared with aortas from control mice. Cav1 silencing in cultured vascular smooth muscle cells prevented AngII-induced ADAM17 induction and activation. In conclusion, Cav1 appears to play a critical role in the formation of AAA and associated endoplasmic reticulum/oxidative stress, presumably through the regulation of caveolae compartmentalized signals induced by AngII.
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59
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Wang Q, Ren J, Morgan S, Liu Z, Dou C, Liu B. Monocyte chemoattractant protein-1 (MCP-1) regulates macrophage cytotoxicity in abdominal aortic aneurysm. PLoS One 2014; 9:e92053. [PMID: 24632850 PMCID: PMC3954911 DOI: 10.1371/journal.pone.0092053] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Accepted: 02/17/2014] [Indexed: 11/18/2022] Open
Abstract
Aims In abdominal aortic aneurysm (AAA), macrophages are detected in the proximity of aortic smooth muscle cells (SMCs). We have previously demonstrated in a murine model of AAA that apoptotic SMCs attract monocytes and other leukocytes by producing MCP-1. Here we tested whether infiltrating macrophages also directly contribute to SMC apoptosis. Methods and Results Using a SMC/RAW264.7 macrophage co-culture system, we demonstrated that MCP-1-primed RAWs caused a significantly higher level of apoptosis in SMCs as compared to control macrophages. Next, we detected an enhanced Fas ligand (FasL) mRNA level and membrane FasL protein expression in MCP-1-primed RAWs. Neutralizing FasL blocked SMC apoptosis in the co-culture. In situ proximity ligation assay showed that SMCs exposed to primed macrophages contained higher levels of receptor interacting protein-1 (RIP1)/Caspase 8 containing cell death complexes. Silencing RIP1 conferred apoptosis resistance to SMCs. In the mouse elastase injury model of aneurysm, aneurysm induction increased the level of RIP1/Caspase 8 containing complexes in medial SMCs. Moreover, TUNEL-positive SMCs in aneurysmal tissues were frequently surrounded by CD68+/FasL+ macrophages. Conversely, elastase-treated arteries from MCP-1 knockout mice display a reduction of both macrophage infiltration and FasL expression, which was accompanied by diminished apoptosis of SMCs. Conclusion Our data suggest that MCP-1-primed macrophages are more cytotoxic. MCP-1 appears to modulate macrophage cytotoxicity by increasing the level of membrane bound FasL. Thus, we showed that MCP-1-primed macrophages kill SMCs through a FasL/Fas-Caspase8-RIP1 mediated mechanism.
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Affiliation(s)
- Qiwei Wang
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin-Madison, Wisconsin, United States of America
| | - Jun Ren
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin-Madison, Wisconsin, United States of America
| | - Stephanie Morgan
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin-Madison, Wisconsin, United States of America
| | - Zhenjie Liu
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin-Madison, Wisconsin, United States of America
| | | | - Bo Liu
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin-Madison, Wisconsin, United States of America
- * E-mail:
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60
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Biros E, Moran CS, Rush CM, Gäbel G, Schreurs C, Lindeman JHN, Walker PJ, Nataatmadja M, West M, Holdt LM, Hinterseher I, Pilarsky C, Golledge J. Differential gene expression in the proximal neck of human abdominal aortic aneurysm. Atherosclerosis 2014; 233:211-8. [PMID: 24529146 DOI: 10.1016/j.atherosclerosis.2013.12.017] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Revised: 12/16/2013] [Accepted: 12/22/2013] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Abdominal aortic aneurysm (AAA) represents a common cause of morbidity and mortality in elderly populations but the mechanisms involved in AAA formation remain incompletely understood. Previous human studies have focused on biopsies obtained from the center of the AAA however it is likely that pathological changes also occur in relatively normal appearing aorta away from the site of main dilatation. The aim of this study was to assess the gene expression profile of biopsies obtained from the neck of human AAAs. METHODS We performed a microarray study of aortic neck specimens obtained from 14 patients with AAA and 8 control aortic specimens obtained from organ donors. Two-fold differentially expressed genes were identified with correction for multiple testing. Mechanisms represented by differentially expressed genes were identified using Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways. Some of the differentially expressed genes were validated by quantitative real-time PCR (qPCR) and immunohistochemistry. RESULTS We identified 1047 differentially expressed genes in AAA necks. The KEGG analysis revealed marked upregulation of genes related to immunity. These pathways included cytokine-cytokine receptor interaction (P = 8.67*10(-12)), chemokine signaling pathway (P = 5.76*10(-07)), and antigen processing and presentation (P = 4.00*10(-04)). Examples of differentially expressed genes validated by qPCR included the T-cells marker CD44 (2.16-fold upregulated, P = 0.008) and the B-cells marker CD19 (3.14-fold upregulated, P = 0.029). The presence of B-cells in AAA necks was confirmed by immunohistochemistry. CONCLUSIONS The role of immunity in AAA is controversial. This study suggests that immune pathways are also upregulated within the undilated aorta proximal to an AAA.
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Affiliation(s)
- Erik Biros
- The Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, School of Medicine, James Cook University, Townsville, Queensland, Australia
| | - Corey S Moran
- The Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, School of Medicine, James Cook University, Townsville, Queensland, Australia
| | - Catherine M Rush
- The Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, School of Medicine, James Cook University, Townsville, Queensland, Australia; School of Veterinary and Biomedical Sciences, James Cook University, Townsville, Queensland, Australia
| | - Gabor Gäbel
- Department of Vascular and Endovascular Surgery, Ludwig Maximilians University Munich, Munich, Germany
| | - Charlotte Schreurs
- Department of Vascular Surgery, Leiden University Medical Center, Leiden, The Netherlands
| | - Jan H N Lindeman
- Department of Vascular Surgery, Leiden University Medical Center, Leiden, The Netherlands
| | - Philip J Walker
- University of Queensland, School of Medicine, Discipline of Surgery, and Centre for Clinical Research and Royal Brisbane and Women's Hospital, Department of Vascular Surgery Herston, Queensland 4029, Australia
| | - Maria Nataatmadja
- The Cardiovascular Research Group, Department of Medicine, the University of Queensland, Queensland, Australia
| | - Malcolm West
- The Cardiovascular Research Group, Department of Medicine, the University of Queensland, Queensland, Australia
| | - Lesca M Holdt
- Institute of Laboratory Medicine, Ludwig Maximilians University Munich, Munich, Germany
| | - Irene Hinterseher
- Department of General, Visceral, Vascular and Thoracic Surgery, Charité Universitätsmedizin Berlin, Charité Campus Mitte, Berlin, Germany
| | - Christian Pilarsky
- Department of Vascular and Endovascular Surgery, Ludwig Maximilians University Munich, Munich, Germany
| | - Jonathan Golledge
- The Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, School of Medicine, James Cook University, Townsville, Queensland, Australia; Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia.
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Abstract
PURPOSE OF REVIEW Family history is a risk factor for abdominal aortic aneurysm (AAA), suggesting that genetic factors play an important role in AAA development, growth and rupture. Identification of these factors could improve understanding of the AAA pathogenesis and be useful to identify at risk individuals. RECENT FINDINGS Many approaches are used to examine genetic determinants of AAA, including genome-wide association studies (GWAS) and DNA linkage studies. Two recent GWAS have identified genetic markers associated with an increased risk of AAA located within the genes for DAB2 interacting protein (DAB2IP) and low density lipoprotein receptor-related protein 1 (LRP1). In addition, a marker on 9p21 associated with other vascular diseases is also strongly associated with AAA. The exact means by which these genes currently control AAA risk is not clear; however, in support of these findings, mice with vascular smooth muscle cell deficiency of Lrp1 are prone to aneurysm development. Further current work is concentrated on other molecular mechanisms relevant in AAA pathogenesis, including noncoding RNAs such as microRNAs. SUMMARY Current studies assessing genetic mechanisms for AAA have significant potential to identify novel mechanisms involved in AAA pathogenesis of high relevance to better clinical management of the disease.
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62
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Molecular imaging of experimental abdominal aortic aneurysms. ScientificWorldJournal 2013; 2013:973150. [PMID: 23737735 PMCID: PMC3655677 DOI: 10.1155/2013/973150] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Accepted: 03/19/2013] [Indexed: 11/18/2022] Open
Abstract
Current laboratory research in the field of abdominal aortic aneurysm (AAA) disease often utilizes small animal experimental models induced by genetic manipulation or chemical application. This has led to the use and development of multiple high-resolution molecular imaging modalities capable of tracking disease progression, quantifying the role of inflammation, and evaluating the effects of potential therapeutics. In vivo imaging reduces the number of research animals used, provides molecular and cellular information, and allows for longitudinal studies, a necessity when tracking vessel expansion in a single animal. This review outlines developments of both established and emerging molecular imaging techniques used to study AAA disease. Beyond the typical modalities used for anatomical imaging, which include ultrasound (US) and computed tomography (CT), previous molecular imaging efforts have used magnetic resonance (MR), near-infrared fluorescence (NIRF), bioluminescence, single-photon emission computed tomography (SPECT), and positron emission tomography (PET). Mouse and rat AAA models will hopefully provide insight into potential disease mechanisms, and the development of advanced molecular imaging techniques, if clinically useful, may have translational potential. These efforts could help improve the management of aneurysms and better evaluate the therapeutic potential of new treatments for human AAA disease.
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63
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Chen X, Lu H, Rateri DL, Cassis LA, Daugherty A. Conundrum of angiotensin II and TGF-β interactions in aortic aneurysms. Curr Opin Pharmacol 2013; 13:180-5. [PMID: 23395156 DOI: 10.1016/j.coph.2013.01.002] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Revised: 01/04/2013] [Accepted: 01/07/2013] [Indexed: 02/08/2023]
Abstract
Angiotensin II (AngII) has been invoked as a principal mediator for the development and progression of both thoracic and abdominal aortic aneurysms. While there is consistency in experimental and clinical studies that overactivation of the renin angiotensin system promotes aortic aneurysm development, there are many unknowns regarding the mechanistic basis underlying AngII-induced aneurysms. Interactions of AngII with TGF-β in both thoracic and abdominal aortic aneurysms have been the focus of recent studies. While these studies have demonstrated profound effects of manipulating TGF-β activity on AngII-induced aortic aneurysms, they have also led to more questions regarding the interactions between AngII and this multifunctional cytokine. This review compiled the recent literature to provide insights into understanding the potentially complex interactions between AngII and TGF-β in the development of aortic aneurysms.
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Affiliation(s)
- Xiaofeng Chen
- Saha Cardiovascular Research Center, University of Kentucky, Lexington, KY 40536, United States
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64
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Iida Y, Xu B, Xuan H, Glover KJ, Tanaka H, Hu X, Fujimura N, Wang W, Schultz JR, Turner CR, Dalman RL. Peptide inhibitor of CXCL4-CCL5 heterodimer formation, MKEY, inhibits experimental aortic aneurysm initiation and progression. Arterioscler Thromb Vasc Biol 2013; 33:718-26. [PMID: 23288157 DOI: 10.1161/atvbaha.112.300329] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
OBJECTIVE Macrophages are critical contributors to abdominal aortic aneurysm (AAA) disease. We examined the ability of MKEY, a peptide inhibitor of CXCL4-CCL5 interaction, to influence AAA progression in murine models. APPROACH AND RESULTS AAAs were created in 10-week-old male C57BL/6J mice by transient infrarenal aortic porcine pancreatic elastase infusion. Mice were treated with MKEY via intravenous injection either (1) before porcine pancreatic elastase infusion or (2) after aneurysm initiation. Immunostaining demonstrated CCL5 and CCR5 expression on aneurysmal aortae and mural monocytes/macrophages, respectively. MKEY treatment partially inhibited migration of adaptively transferred leukocytes into aneurysmal aortae in recipient mice. Although all vehicle-pretreated mice developed AAAs, aneurysms formed in only 60% (3/5) and 14% (1/7) of mice pretreated with MKEY at 10 and 20 mg/kg, respectively. MKEY pretreatment reduced aortic diameter enlargement, preserved medial elastin fibers and smooth muscle cells, and attenuated mural macrophage infiltration, angiogenesis, and aortic metalloproteinase 2 and 9 expression after porcine pancreatic elastase infusion. MKEY initiated after porcine pancreatic elastase infusion also stabilized or reduced enlargement of existing AAAs. Finally, MKEY treatment was effective in limiting AAA formation after angiotensin II infusion in apolipoprotein E-deficient mice. CONCLUSIONS MKEY suppresses AAA formation and progression in 2 complementary experimental models. Peptide inhibition of CXCL4-CCL5 interactions may represent a viable translational strategy to limit progression of human AAA disease.
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Affiliation(s)
- Yasunori Iida
- Division of Vascular Surgery, Stanford University School of Medicine, Stanford, CA 94305-5102, USA
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65
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Involvement of the renin-angiotensin system in abdominal and thoracic aortic aneurysms. Clin Sci (Lond) 2012; 123:531-43. [PMID: 22788237 DOI: 10.1042/cs20120097] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Aortic aneurysms are relatively common maladies that may lead to the devastating consequence of aortic rupture. AAAs (abdominal aortic aneurysms) and TAAs (thoracic aortic aneurysms) are two common forms of aneurysmal diseases in humans that appear to have distinct pathologies and mechanisms. Despite this divergence, there are numerous and consistent demonstrations that overactivation of the RAS (renin-angiotensin system) promotes both AAAs and TAAs in animal models. For example, in mice, both AAAs and TAAs are formed during infusion of AngII (angiotensin II), the major bioactive peptide in the RAS. There are many proposed mechanisms by which the RAS initiates and perpetuates aortic aneurysms, including effects of AngII on a diverse array of cell types and mediators. These experimental findings are complemented in humans by genetic association studies and retrospective analyses of clinical data that generally support a role of the RAS in both AAAs and TAAs. Given the lack of a validated pharmacological therapy for any form of aortic aneurysm, there is a pressing need to determine whether the consistent findings on the role of the RAS in animal models are translatable to humans afflicted with these diseases. The present review compiles the recent literature that has shown the RAS as a critical component in the pathogenesis of aortic aneurysms.
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