1
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Wong NKP, Solly EL, Le R, Nankivell VA, Mulangala J, Psaltis PJ, Nicholls SJ, Ng MKC, Bursill CA, Tan JTM. TRIM2 Selectively Regulates Inflammation-Driven Pathological Angiogenesis without Affecting Physiological Hypoxia-Mediated Angiogenesis. Int J Mol Sci 2024; 25:3343. [PMID: 38542330 PMCID: PMC10970352 DOI: 10.3390/ijms25063343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 03/05/2024] [Accepted: 03/13/2024] [Indexed: 04/04/2024] Open
Abstract
Angiogenesis is a critical physiological response to ischemia but becomes pathological when dysregulated and driven excessively by inflammation. We recently identified a novel angiogenic role for tripartite-motif-containing protein 2 (TRIM2) whereby lentiviral shRNA-mediated TRIM2 knockdown impaired endothelial angiogenic functions in vitro. This study sought to determine whether these effects could be translated in vivo and to determine the molecular mechanisms involved. CRISPR/Cas9-generated Trim2-/- mice that underwent a periarterial collar model of inflammation-induced angiogenesis exhibited significantly less adventitial macrophage infiltration relative to wildtype (WT) littermates, concomitant with decreased mRNA expression of macrophage marker Cd68 and reduced adventitial proliferating neovessels. Mechanistically, TRIM2 knockdown in endothelial cells in vitro attenuated inflammation-driven induction of critical angiogenic mediators, including nuclear HIF-1α, and curbed the phosphorylation of downstream effector eNOS. Conversely, in a hindlimb ischemia model of hypoxia-mediated angiogenesis, there were no differences in blood flow reperfusion to the ischemic hindlimbs of Trim2-/- and WT mice despite a decrease in proliferating neovessels and arterioles. TRIM2 knockdown in vitro attenuated hypoxia-driven induction of nuclear HIF-1α but had no further downstream effects on other angiogenic proteins. Our study has implications for understanding the role of TRIM2 in the regulation of angiogenesis in both pathophysiological contexts.
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Affiliation(s)
- Nathan K. P. Wong
- Vascular Research Centre, Lifelong Health Theme, South Australian Health and Medical Research Institute, Adelaide, SA 5000, Australia; (N.K.P.W.); (E.L.S.); (R.L.); (V.A.N.); (J.M.); (P.J.P.); (C.A.B.)
- Faculty of Medicine and Health, The University of Sydney School of Medicine, Camperdown, NSW 2050, Australia;
- Department of Cardiology, St. Vincent’s Hospital, Darlinghurst, NSW 2010, Australia
| | - Emma L. Solly
- Vascular Research Centre, Lifelong Health Theme, South Australian Health and Medical Research Institute, Adelaide, SA 5000, Australia; (N.K.P.W.); (E.L.S.); (R.L.); (V.A.N.); (J.M.); (P.J.P.); (C.A.B.)
- Adelaide Medical School, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia
| | - Richard Le
- Vascular Research Centre, Lifelong Health Theme, South Australian Health and Medical Research Institute, Adelaide, SA 5000, Australia; (N.K.P.W.); (E.L.S.); (R.L.); (V.A.N.); (J.M.); (P.J.P.); (C.A.B.)
- College of Medicine and Public Health, Flinders University, Adelaide, SA 5042, Australia
| | - Victoria A. Nankivell
- Vascular Research Centre, Lifelong Health Theme, South Australian Health and Medical Research Institute, Adelaide, SA 5000, Australia; (N.K.P.W.); (E.L.S.); (R.L.); (V.A.N.); (J.M.); (P.J.P.); (C.A.B.)
- Adelaide Medical School, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia
| | - Jocelyne Mulangala
- Vascular Research Centre, Lifelong Health Theme, South Australian Health and Medical Research Institute, Adelaide, SA 5000, Australia; (N.K.P.W.); (E.L.S.); (R.L.); (V.A.N.); (J.M.); (P.J.P.); (C.A.B.)
- Heart Foundation, Brisbane, QLD 4000, Australia
| | - Peter J. Psaltis
- Vascular Research Centre, Lifelong Health Theme, South Australian Health and Medical Research Institute, Adelaide, SA 5000, Australia; (N.K.P.W.); (E.L.S.); (R.L.); (V.A.N.); (J.M.); (P.J.P.); (C.A.B.)
- Adelaide Medical School, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia
| | | | - Martin K. C. Ng
- Faculty of Medicine and Health, The University of Sydney School of Medicine, Camperdown, NSW 2050, Australia;
- Department of Cardiology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia
| | - Christina A. Bursill
- Vascular Research Centre, Lifelong Health Theme, South Australian Health and Medical Research Institute, Adelaide, SA 5000, Australia; (N.K.P.W.); (E.L.S.); (R.L.); (V.A.N.); (J.M.); (P.J.P.); (C.A.B.)
- Faculty of Medicine and Health, The University of Sydney School of Medicine, Camperdown, NSW 2050, Australia;
- Adelaide Medical School, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia
| | - Joanne T. M. Tan
- Vascular Research Centre, Lifelong Health Theme, South Australian Health and Medical Research Institute, Adelaide, SA 5000, Australia; (N.K.P.W.); (E.L.S.); (R.L.); (V.A.N.); (J.M.); (P.J.P.); (C.A.B.)
- Faculty of Medicine and Health, The University of Sydney School of Medicine, Camperdown, NSW 2050, Australia;
- Adelaide Medical School, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, SA 5005, Australia
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2
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Ting KK, Coleman P, Kim HJ, Zhao Y, Mulangala J, Cheng NC, Li W, Gunatilake D, Johnstone DM, Loo L, Neely GG, Yang P, Götz J, Vadas MA, Gamble JR. Vascular senescence and leak are features of the early breakdown of the blood-brain barrier in Alzheimer's disease models. GeroScience 2023; 45:3307-3331. [PMID: 37782439 PMCID: PMC10643714 DOI: 10.1007/s11357-023-00927-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 08/27/2023] [Indexed: 10/03/2023] Open
Abstract
Alzheimer's disease (AD) is an age-related disease, with loss of integrity of the blood-brain barrier (BBB) being an early feature. Cellular senescence is one of the reported nine hallmarks of aging. Here, we show for the first time the presence of senescent cells in the vasculature in AD patients and mouse models of AD. Senescent endothelial cells and pericytes are present in APP/PS1 transgenic mice but not in wild-type littermates at the time of amyloid deposition. In vitro, senescent endothelial cells display altered VE-cadherin expression and loss of cell junction formation and increased permeability. Consistent with this, senescent endothelial cells in APP/PS1 mice are present at areas of vascular leak that have decreased claudin-5 and VE-cadherin expression confirming BBB breakdown. Furthermore, single cell sequencing of endothelial cells from APP/PS1 transgenic mice confirms that adhesion molecule pathways are among the most highly altered pathways in these cells. At the pre-plaque stage, the vasculature shows significant signs of breakdown, with a general loss of VE-cadherin, leakage within the microcirculation, and obvious pericyte perturbation. Although senescent vascular cells were not directly observed at sites of vascular leak, senescent cells were close to the leak area. Thus, we would suggest in AD that there is a progressive induction of senescence in constituents of the neurovascular unit contributing to an increasing loss of vascular integrity. Targeting the vasculature early in AD, either with senolytics or with drugs that improve the integrity of the BBB may be valid therapeutic strategies.
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Affiliation(s)
- Ka Ka Ting
- Vascular Biology Program, Centenary Institute, Camperdown, NSW, Australia.
- School of Medical Sciences, University of Sydney, Camperdown, NSW, Australia.
| | - Paul Coleman
- Vascular Biology Program, Centenary Institute, Camperdown, NSW, Australia
- School of Medical Sciences, University of Sydney, Camperdown, NSW, Australia
| | - Hani Jieun Kim
- Computational Systems Biology Group, Children's Medical Research Institute, Faculty of Medicine and Health, The University of Sydney, Westmead, NSW, 2145, Australia
| | - Yang Zhao
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, Jiangsu, China
| | - Jocelyne Mulangala
- Vascular Biology Program, Centenary Institute, Camperdown, NSW, Australia
| | - Ngan Ching Cheng
- Vascular Biology Program, Centenary Institute, Camperdown, NSW, Australia
| | - Wan Li
- Department of General Surgery, Jiangsu Province Hospital of Chinese Medicine, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, 210029, China
| | - Dilini Gunatilake
- Vascular Biology Program, Centenary Institute, Camperdown, NSW, Australia
| | - Daniel M Johnstone
- School of Medical Sciences, University of Sydney, Camperdown, NSW, Australia
- School of Biomedical Sciences & Pharmacy, University of Newcastle, Callaghan, NSW, Australia
| | - Lipin Loo
- Charles Perkins Centre, Dr. John and Anne Chong Lab for Functional Genomics, Centenary Institute, & School of Life and Environmental Sciences, University of Sydney, Camperdown, NSW, Australia
| | - G Gregory Neely
- Charles Perkins Centre, Dr. John and Anne Chong Lab for Functional Genomics, Centenary Institute, & School of Life and Environmental Sciences, University of Sydney, Camperdown, NSW, Australia
| | - Pengyi Yang
- Computational Systems Biology Group, Children's Medical Research Institute, Faculty of Medicine and Health, The University of Sydney, Westmead, NSW, 2145, Australia
| | - Jürgen Götz
- Clem Jones Centre for Ageing Dementia Research, Queensland Brain Institute, The University of Queensland, Brisbane, Australia
| | - Mathew A Vadas
- Vascular Biology Program, Centenary Institute, Camperdown, NSW, Australia
- Heart Research Institute, Sydney, NSW, Australia
| | - Jennifer R Gamble
- Vascular Biology Program, Centenary Institute, Camperdown, NSW, Australia.
- School of Medical Sciences, University of Sydney, Camperdown, NSW, Australia.
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3
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Alsaigh T, Di Bartolo BA, Mulangala J, Figtree GA, Leeper NJ. Bench-to-Bedside in Vascular Medicine: Optimizing the Translational Pipeline for Patients With Peripheral Artery Disease. Circ Res 2021; 128:1927-1943. [PMID: 34110900 PMCID: PMC8208504 DOI: 10.1161/circresaha.121.318265] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Peripheral arterial disease is a growing worldwide problem with a wide spectrum of clinical severity and is projected to consume >$21 billion per year in the United States alone. While vascular researchers have brought several therapies to the clinic in recent years, few of these approaches have leveraged advances in high-throughput discovery screens, novel translational models, or innovative trial designs. In the following review, we discuss recent advances in unbiased genomics and broader omics technology platforms, along with preclinical vascular models designed to enhance our understanding of disease pathobiology and prioritize targets for additional investigation. Furthermore, we summarize novel approaches to clinical studies in subjects with claudication and ischemic ulceration, with an emphasis on streamlining and accelerating bench-to-bedside translation. By providing a framework designed to enhance each aspect of future clinical development programs, we hope to enrich the pipeline of therapies that may prevent loss of life and limb for those with peripheral arterial disease.
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Affiliation(s)
- Tom Alsaigh
- Department of Surgery, Division of Vascular Surgery, Stanford University School of Medicine, Stanford, California, United States of America
| | - Belinda A. Di Bartolo
- Cardiothoracic and Vascular Health, Kolling Institute and Department of Cardiology, Royal North Shore Hospital, Northern Sydney Local Health District, Australia
| | | | - Gemma A. Figtree
- Cardiothoracic and Vascular Health, Kolling Institute and Department of Cardiology, Royal North Shore Hospital, Northern Sydney Local Health District, Australia
| | - Nicholas J. Leeper
- Department of Surgery, Division of Vascular Surgery, Stanford University School of Medicine, Stanford, California, United States of America
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4
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Mulangala J, Mulangala J, Solly E, Bamhare P, Wilsdom L, Wong N, Tan J, Bursill C, Nicholls S, Di Bartolo B. Elevated Calcium Increases Calcification to Impair Ischaemia-Driven Angiogenesis. Heart Lung Circ 2021. [DOI: 10.1016/j.hlc.2021.06.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Mulangala J, Akers EJ, Solly EL, Psaltis PJ, Tan JT, Nicholls SJ, Bursill C, Di Bartolo BA. Abstract 660: Elevated Calcium Drives Inflammatory-Driven Angiogenesis. Arterioscler Thromb Vasc Biol 2018. [DOI: 10.1161/atvb.38.suppl_1.660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background:
Peripheral arterial disease (PAD) is characterised by accelerated arterial calcification and impairment in angiogenesis, both of which can influence cardiovascular clinical outcomes. Studies implicate calcification as a driver of PAD, however, the mechanisms by which calcification modulates angiogenesis remain poorly understood. This study assessed the effect of high calcium on angiogenesis both
in vitro
and
in vivo
.
Methods:
Human Coronary Artery Endothelial Cells (EC) were cultured and treated with calcification medium (CM) (CaCl
2
2.7mM, Na
2
PO
4
2.0mM) for 24 h. Angiogenic assays of proliferation, migration and tubulogenesis were conducted, and immunoblotting assessed angiogenic regulatory proteins.
In vivo
studies employed a calcification model with 8-12-week-old male OPG
-/-
and wildtype (C57BL6/J, control) mice which underwent hind-limb ischaemia (HLI) surgery. Blood flow reperfusion was assessed by Laser Doppler Perfusion Imaging (LDPI). Calcium assay assessed calcium levels in blood serum of the C57BL6/J and OPG
-/-
mice.
Results:
CM significantly reduced EC tubulogenesis and viability (34% and 58% p<0.05) but increased migration (p<0.0001) over 24h. There was a significant increase in the protein levels of angiogenic regulators VEGFA (p<0.0001) and HIF-1α (p<0.0001). CM also significantly increased NF-κB (P65) nuclear protein, a key mediator of inflammatory-driven angiogenesis. qRT-PCR showed upregulation of osteoinductive factor Bone Morphogenetic protein (BMP2), and transcription factor Runx2 mRNA expression, both involved in osteogenesis and calcification. Blood serum calcium levels were significantly increased in OPG deficient mice. LDPI found there was significantly reduced blood-flow reperfusion in OPG
-/-
mice at days 6 (0.03±0.01 vs 0.32±0.05 p<0.01) and day 10 (0.08±0.01 vs 0.35±0.05 p<0.01) post HLI induction, compared to controls.
Conclusion:
This is the first demonstration that high-levels of calcium impair ischaemia-driven angiogenesis
in vivo
and cause inflammation in ECs that suppresses tubule formation
in vitro
, despite upregulation of key angiogenic regulators VEGFA and HIF-1α. These findings have implications for the development of therapies that can suppress calcification in PAD.
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6
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Akers EJ, Mulangala J, Psaltis PJ, Bursill C, Nicholls SJ, Di Bartolo BA. Abstract 169: Lipoproteins and their Modified Forms Regulate Smooth Muscle Cell Calcification. Arterioscler Thromb Vasc Biol 2018. [DOI: 10.1161/atvb.38.suppl_1.169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background:
Vascular calcification (VC), alongside atherogenic lipoprotein profiles, have been correlated with poor cardiovascular outcome, however there is a paucity of literature exploring the relationship between the two regarding VC progression. We therefore aim to examine the roles of lipoprotein species and their oxidised forms on both medial and intimal VC.
Methods:
Human aortic smooth muscle cells (HAoSMC) were pre-treated with 200 μg/ml high (HDL), low (LDL) and very low (VLDL) density lipoproteins for 24 hours before treating cells with a calcification medium (CM; Ca 2.7mM, PO
4
2.0 mM). Cells were harvested using an alizarin red (ARS) calcification assay, or at various time points for qPCR analysis. In parallel,
in vivo
studies using apolipoprotein E knock-out mice were fed an atherogenic diet for 40 weeks and received reconstituted HDL (rHDL) infusions containing apoA-I (20mg/kg) and 1-palmitoyl-2-linoleoyl phosphatidylcholine during the final 4 weeks of the study. Tissues were harvested and stained for plaque assessment (H&E) and calcium deposits (ARS).
Results:
Pre-treatment of HAoSMC with rHDL inhibited calcification (43.9%, p<0.001), whereas ox-rHDL removed its protective effects. Likewise, ox-LDL (77.1%, p<0.05) also upregulated calcium deposition and interestingly ox-VLDL significantly decreased calcification (70.5%, p<0.05) with their native counterparts having no effects. PCR measures of calcification markers Runx2, RANKL and alkaline phosphatase show a time-dependent increase in expression as calcification occurs. In animal studies, no change in weight gain, cholesterol or triglyceride levels were observed with treatment. In addition, rHDL infusions did not alter plaque size however ARS staining of the brachiocephalic artery demonstrated a significant reduction (6.58%, p<0.05) in calcification present in the atherosclerotic plaque.
Conclusions:
This study is the first to demonstrate the effects of lipoproteins on VC
in vitro
and the effects of rHDL on
in vivo
VC. Somewhat in accordance to the roles of lipoproteins in atherosclerosis, HDL and ox-VLDL show a reduction of calcification, where-as ox-LDL enhances calcification of HAoSMC.
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7
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Cannizzo CM, Adonopulos AA, Solly EL, Ridiandries A, Vanags LZ, Mulangala J, Yuen SCG, Tsatralis T, Henriquez R, Robertson S, Nicholls SJ, Di Bartolo BA, Ng MKC, Lam YT, Bursill CA, Tan JTM. VEGFR2 is activated by high-density lipoproteins and plays a key role in the proangiogenic action of HDL in ischemia. FASEB J 2018; 32:2911-2922. [PMID: 29401597 DOI: 10.1096/fj.201700617r] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
High-density lipoproteins augment hypoxia-induced angiogenesis by inducing the key angiogenic vascular endothelial growth factor A (VEGFA) and total protein levels of its receptor 2 (VEGFR2). The activation/phosphorylation of VEGFR2 is critical for mediating downstream, angiogenic signaling events. This study aimed to determine whether reconstituted high-density lipoprotein (rHDL) activates VEGFR2 phosphorylation and the downstream signaling events and the importance of VEGFR2 in the proangiogenic effects of rHDL in hypoxia. In vitro, rHDL increased VEGFR2 activation and enhanced phosphorylation of downstream, angiogenic signaling proteins ERK1/2 and p38 MAPK in hypoxia. Incubation with a VEGFR2-neutralizing antibody attenuated rHDL-induced phosphorylation of VEGFR2, ERK1/2, p38 MAPK, and tubule formation. In a murine model of ischemia-driven neovascularization, rHDL infusions enhanced blood perfusion and augmented capillary and arteriolar density. Infusion of a VEGFR2-neutralizing antibody ablated those proangiogenic effects of rHDL. Circulating Sca1+/CXCR4+ angiogenic progenitor cell levels, important for neovascularization in response to ischemia, were higher in rHDL-infused mice 3 d after ischemic induction, but that did not occur in mice that also received the VEGFR2-neutralizing antibody. In summary, VEGFR2 has a key role in the proangiogenic effects of rHDL in hypoxia/ischemia. These findings have therapeutic implications for angiogenic diseases associated with an impaired response to tissue ischemia.-Cannizzo, C. M., Adonopulos, A. A., Solly, E. L., Ridiandries, A., Vanags, L. Z., Mulangala, J., Yuen, S. C. G., Tsatralis, T., Henriquez, R., Robertson, S., Nicholls, S. J., Di Bartolo, B. A., Ng, M. K. C., Lam, Y. T., Bursill, C. A., Tan, J. T. M. VEGFR2 is activated by high-density lipoproteins and plays a key role in the proangiogenic action of HDL in ischemia.
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Affiliation(s)
- Carla M Cannizzo
- The Heart Research Institute, Newtown, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Camperdown, New South Wales, Australia
| | - Aaron A Adonopulos
- The Heart Research Institute, Newtown, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Camperdown, New South Wales, Australia
| | - Emma L Solly
- Heart Health Theme, South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia
| | - Anisyah Ridiandries
- The Heart Research Institute, Newtown, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Camperdown, New South Wales, Australia
| | - Laura Z Vanags
- The Heart Research Institute, Newtown, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Camperdown, New South Wales, Australia
| | - Jocelyne Mulangala
- Heart Health Theme, South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia.,Adelaide Medical School, Faculty of Health and Medical Sciences, The University of Adelaide, Adelaide, South Australia, Australia; and
| | - Sui Ching G Yuen
- The Heart Research Institute, Newtown, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Camperdown, New South Wales, Australia
| | - Tania Tsatralis
- The Heart Research Institute, Newtown, New South Wales, Australia
| | - Rodney Henriquez
- The Heart Research Institute, Newtown, New South Wales, Australia
| | - Stacy Robertson
- The Heart Research Institute, Newtown, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Camperdown, New South Wales, Australia
| | - Stephen J Nicholls
- Heart Health Theme, South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia.,Adelaide Medical School, Faculty of Health and Medical Sciences, The University of Adelaide, Adelaide, South Australia, Australia; and
| | - Belinda A Di Bartolo
- Heart Health Theme, South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia.,Adelaide Medical School, Faculty of Health and Medical Sciences, The University of Adelaide, Adelaide, South Australia, Australia; and
| | - Martin K C Ng
- The Heart Research Institute, Newtown, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Camperdown, New South Wales, Australia.,Department of Cardiology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - Yuen Ting Lam
- The Heart Research Institute, Newtown, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Camperdown, New South Wales, Australia
| | - Christina A Bursill
- The Heart Research Institute, Newtown, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Camperdown, New South Wales, Australia.,Heart Health Theme, South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia.,Adelaide Medical School, Faculty of Health and Medical Sciences, The University of Adelaide, Adelaide, South Australia, Australia; and
| | - Joanne T M Tan
- The Heart Research Institute, Newtown, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Camperdown, New South Wales, Australia.,Heart Health Theme, South Australian Health and Medical Research Institute, Adelaide, South Australia, Australia.,Adelaide Medical School, Faculty of Health and Medical Sciences, The University of Adelaide, Adelaide, South Australia, Australia; and
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8
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Mulangala J, Akers EJ, Psaltis PJ, Nicholls SJ, Di Bartolo BA. Abstract 315: Calcium Dose Dependently Influences Endothelial Cell Angiogenesis. Arterioscler Thromb Vasc Biol 2017. [DOI: 10.1161/atvb.37.suppl_1.315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background:
Peripheral artery disease (PAD) is a progressive occlusive disease of the arteries and a vascular complication in diabetes. Vascular calcification (VC) is implicated as a potential driver of PAD, and although the exact mechanisms are unclear, the site and location of calcification within the arterial wall contributes greatly. Long considered a passive process, VC is now recognised as a tightly regulated active process balancing the promotion and inhibition of calcification in the arterial wall. There is little evidence however, to demonstrate the effect of calcification on endothelial cell angiogenesis. This study sought to investigate the effects of calcium as a known inducer of calcification on
in vitro
angiogenesis.
Methods:
Human Coronary Artery Endothelial Cells were cultured and treated with increasing calcium concentrations (CaCl
2
2.45-3.3 mM) for 24h. Proliferation, migration and tubule formation assays were conducted and real-time PCR assessed angiogenic and osteogenic genes. Alkaline phosphotase (ALP) activity was measured in supernatants following treatment.
Results:
High concentrations of calcium reduced cell proliferation with a corresponding increase in ALP production suggesting release of osteogenic stimuli adversely affects cell viability. Mid-range concentrations of calcium induced a significant increase in cell migration (1.0 vs 2.4±0.3, p<0.05) while higher concentrations elicited no effect. Calcium treatment demonstrated a dose response where mid-range concentrations increased gene expression of hypoxia-inducible factor-1α (>500 fold), and fibroblast growth factor-2 (>150 fold). This increase corresponded with a decrease (1.0 vs 15.02±4.24; p<0.0001) in osteoprotegerin (OPG) at mid-range calcium with a significant increase at the highest concentration (1.0 vs 342±13.27; p<0.01) illustrating calcium-induced expression of OPG, a known protective gene in VC, may also regulate angiogenesis.
Conclusion:
This is the first demonstration investigating the effects of calcium on endothelial cell angiogenesis. These findings suggest that calcium can directly affect genes involved in regulating angiogenesis, and could therefore provide an opportunity to develop potential treatments.
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Affiliation(s)
| | - Emma J Akers
- South Australian Health and Med Rsch Institute, Adelaide, Australia
| | - Peter J Psaltis
- South Australian Health and Med Rsch Institute, Adelaide, Australia
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