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Vessel sprouting

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https://www.readbyqxmd.com/read/29129724/retinal-vasculature-development-in-health-and-disease
#1
REVIEW
Senthil Selvam, Tejas Kumar, Marcus Fruttiger
Development of the retinal vasculature is based on highly coordinated signalling between different cell types of the retina, integrating internal metabolic requirements with external influences such as the supply of oxygen and nutrients. The developing mouse retinal vasculature is a useful model system to study these interactions because it is experimentally accessible for intra ocular injections and genetic manipulations, can be easily imaged and develops in a similar fashion to that of humans. Research using this model has provided insights about general principles of angiogenesis as well as pathologies that affect the developing retinal vasculature...
November 9, 2017: Progress in Retinal and Eye Research
https://www.readbyqxmd.com/read/29119674/assessment-of-hydrogels-for-bioprinting-of-endothelial-cells
#2
Leo Benning, Ludwig Gutzweiler, Kevin Tröndle, Julian Riba, Roland Zengerle, Peter Koltay, Stefan Zimmermann, G Björn Stark, Günter Finkenzeller
In tissue engineering applications, vascularization can be accomplished by co-implantation of tissue forming cells and endothelial cells (ECs), whereby the latter are able to form functional blood vessels. The use of three-dimensional (3D) bioprinting technologies has the potential to improve the classical tissue engineering approach because these will allow the generation of scaffolds with high spatial control of endothelial cell allocation. This study focuses on a side by side comparisons of popular commercially available bioprinting hydrogels (matrigel, fibrin, collagen, gelatin, agarose, Pluronic F-127, alginate and alginate/gelatin) in the context of their physicochemical parameters, their swelling/degradation characteristics, their biological effects on vasculogenesis-related EC parameters and their printability...
November 8, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29112161/collateral-damage-intended-cancer-associated-fibroblasts-and-vasculature-are-potential-targets-in-cancer-therapy
#3
REVIEW
Ana Cavaco, Maryam Rezaei, Stephan Niland, Johannes A Eble
After oncogenic transformation, tumor cells rewire their metabolism to obtain sufficient energy and biochemical building blocks for cell proliferation, even under hypoxic conditions. Glucose and glutamine become their major limiting nutritional demands. Instead of being autonomous, tumor cells change their immediate environment not only by their metabolites but also by mediators, such as juxtacrine cell contacts, chemokines and other cytokines. Thus, the tumor cells shape their microenvironment as well as induce resident cells, such as fibroblasts and endothelial cells (ECs), to support them...
November 7, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29093528/therapeutic-sirna-targeting-endothelial-kdr-decreases-portosystemic-collateralization-in-portal-hypertension
#4
Javier Gallego, Ester Garcia-Pras, Marc Mejias, Nuria Pell, Ute Schaeper, Mercedes Fernandez
Development of portosystemic collateral vessels and gastroesophageal varices is responsible for the most serious clinical consequences of portal hypertension, but effective clinical therapies are limited. Here we developed and investigated the therapeutic potential of an innovative liposomally-formulated short-interfering RNA (siRNA) technology based on clinical stage components, capable to attenuate production of the endothelial kinase insert domain receptor (KDR), which controls portosystemic collateralization and contributes to disease progression and aggravation...
November 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29084210/zeb1-repressed-micrornas-inhibit-autocrine-signaling-that-promotes-vascular-mimicry-of-breast-cancer-cells
#5
E M Langer, N D Kendsersky, C J Daniel, G M Kuziel, C Pelz, K M Murphy, M R Capecchi, R C Sears
During normal tumor growth and in response to some therapies, tumor cells experience acute or chronic deprivation of nutrients and oxygen and induce tumor vascularization. While this occurs predominately through sprouting angiogenesis, tumor cells have also been shown to directly contribute to vessel formation through vascular mimicry (VM) and/or endothelial transdifferentiation. The extrinsic and intrinsic mechanisms underlying tumor cell adoption of endothelial phenotypes, however, are not well understood...
October 30, 2017: Oncogene
https://www.readbyqxmd.com/read/29082215/modelling-tumor-induced-angiogenesis-combination-of-stochastic-sprout-spacing-and-sprout-progression
#6
F Hosseini, N Naghavi
BACKGROUND: Angiogenesis initiated by cancerous cells is the process by which new blood vessels are formed to enhance oxygenation and growth of tumor. OBJECTIVE: In this paper, we present a new multiscale mathematical model for the formation of a vascular network in tumor angiogenesis process. METHODS: Our model couples an improved sprout spacing model as a stochastic mathematical model of sprouting along an existing parent blood vessel, with a mathematical model of sprout progression in the extracellular matrix (ECM) in response to some tumor angiogenic factors (TAFs)...
September 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29051140/fgd5-faciogenital-dysplasia-5-regulates-vegf-vascular-endothelial-growth-factor-a-receptor-2-coupling-to-pi3-phosphoinositide-3-kinase-and-receptor-recycling
#7
Maikel A Farhan, Abul K Azad, Nicolas Touret, Allan G Murray
OBJECTIVE: VEGF (vascular endothelial growth factor-A) signaling to the endothelial cell (EC) through VEGFR2 (VEGF receptor-2) is the principal cue driving new blood vessel formation. FGD5 (faciogenital dysplasia-5)-a Rho-family guanine nucleotide exchange factor-is selectively expressed in EC. Deficiency of FGD5 is embryonically lethal in mice and perturbs angiogenesis and VEGF signal transduction. However, the mechanism of FGD5 regulation of VEGF signaling is poorly understood. APPROACH AND RESULTS: Angiogenic sprouting and EC cytoskeletal remodeling were evaluated in a 3-dimensional (3D) in vitro model...
October 19, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29047209/effects-of-cryopreservation-on-adipose-tissue-derived-microvascular-fragments
#8
Matthias W Laschke, Philipp Karschnia, Claudia Scheuer, Alexander Heß, Wolfgang Metzger, Michael D Menger
Adipose tissue-derived microvascular fragments (ad-MVF) are effective vascularization units for tissue engineering. They rapidly reassemble into new microvascular networks after seeding on scaffolds and subsequent in vivo implantation. Herein, we analyzed whether the vascularization capacity of ad-MVF is affected by cryopreservation. Ad-MVF were isolated from the epididymal fat pads of C57BL/6 mice and cryopreserved for 7 days to compare their morphology, viability, cellular composition and protein expression with freshly isolated control ad-MVF...
October 19, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29038312/dynamic-stroma-reorganization-drives-blood-vessel-dysmorphia-during-glioma-growth
#9
Thomas Mathivet, Claire Bouleti, Matthias Van Woensel, Fabio Stanchi, Tina Verschuere, Li-Kun Phng, Joost Dejaegher, Marly Balcer, Ken Matsumoto, Petya B Georgieva, Jochen Belmans, Raf Sciot, Christian Stockmann, Massimiliano Mazzone, Steven De Vleeschouwer, Holger Gerhardt
Glioma growth and progression are characterized by abundant development of blood vessels that are highly aberrant and poorly functional, with detrimental consequences for drug delivery efficacy. The mechanisms driving this vessel dysmorphia during tumor progression are poorly understood. Using longitudinal intravital imaging in a mouse glioma model, we identify that dynamic sprouting and functional morphogenesis of a highly branched vessel network characterize the initial tumor growth, dramatically changing to vessel expansion, leakage, and loss of branching complexity in the later stages...
October 16, 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/29037991/vegfa-signaling-regulates-diverse-artery-vein-formation-in-vertebrate-vasculatures
#10
Daqing Jin, Diqi Zhu, Yabo Fang, Yiwei Chen, Gaihong Yu, Weijun Pan, Dong Liu, Fen Li, Tao P Zhong
Vascular endothelial growth factor A (Vegfa) signaling regulates vascular development during embryogenesis and organ formation. However, the signaling mechanisms that govern the formation of various arteries/veins in various tissues are incompletely understood. In this study, we utilized transcription activator-like effector nuclease (TALEN) to generate zebrafish vegfaa mutants. vegfaa(-/-) embryos are embryonic lethal, and display a complete loss of the dorsal aorta (DA) and expansion of the cardinal vein...
September 21, 2017: Journal of Genetics and Genomics, Yi Chuan Xue Bao
https://www.readbyqxmd.com/read/29027735/temporal-trends-in-percutaneous-coronary-interventions-thru-the-drug-eluting-stent-era-insights-from-18-641-procedures-performed-over-12-year-period
#11
Uri Landes, Tamir Bental, Amos Levi, Abid Assali, Hana Vaknin-Assa, Eli I Lev, Eldad Rechavia, Gabriel Greenberg, Katia Orvin, Ran Kornowski
BACKGROUND: The last decade, regarded as the DES era in PCI, has witnessed significant advances in the management of coronary disease. We aimed to assess temporal trends in the practice and outcome of percutaneous coronary intervention (PCI) during the drug eluting stent (DES) era. METHODS: We analyzed 18,641 consecutive PCI's performed between January 2004 and December 2016, distinguished by procedural date (Q1 : 2004-2006, n = 4,865; Q2 : 2007-2009, n = 4,977; Q3 : 2010-2012, n = 4,230; Q4 : 2013-2016, n = 4,569)...
October 13, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28983687/low-power-laser-irradiation-inhibits-pdgf-bb-induced-migration-and-proliferation-via-apoptotic-cell-death-in-vascular-smooth-muscle-cells
#12
Suji Baek, Kang Pa Lee, Long Cui, Yunkyoung Ryu, Jung Min Hong, Junghwan Kim, Seung Hyo Jung, Young Min Bae, Kyung Jong Won, Bokyung Kim
Vascular restenosis after injury of blood vessel has been implicated in various responses including apoptosis, migration, and proliferation in vascular smooth muscle cells (VSMCs) stimulated by diverse growth factors underlying platelet-derived growth factor (PDGF). Previous studies evaluated the effects of low-power laser (LPL) irradiation over various wavelength ranges on VSMC events in normal and pathologic states. However, whether VSMC responses are affected by LPL irradiation remains unclear. The purpose of this study is to explore the effects of LPL (green diode laser 532-nm pulsed wave of 300 mW at a spot diameter of 1 mm) irradiation on the responses, apoptosis, migration, and proliferation of VSMCs...
December 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28982669/targeting-cx40-connexin40-expression-or-function-reduces-angiogenesis-in-the-developing-mouse-retina
#13
Jacques-Antoine Haefliger, Florent Allagnat, Lauriane Hamard, Loïc Le Gal, Paolo Meda, Denise Nardelli-Haefliger, Elisabeth Génot, Florian Alonso
OBJECTIVE: Cx40 (Connexin40) forms intercellular channels that coordinate the electric conduction in the heart and the vasomotor tone in large vessels. The protein was shown to regulate tumoral angiogenesis; however, whether Cx40 also contributes to physiological angiogenesis is still unknown. APPROACH AND RESULTS: Here, we show that Cx40 contributes to physiological angiogenesis. Genetic deletion of Cx40 leads to a reduction in vascular growth and capillary density in the neovascularization model of the mouse neonatal retina...
November 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28963101/chronic-psychological-stress-accelerates-vascular-senescence-and-impairs-ischemia-induced-neovascularization-the-role-of-dipeptidyl-peptidase-4-glucagon-like-peptide-1-adiponectin-axis
#14
Limei Piao, Guangxian Zhao, Enbo Zhu, Aiko Inoue, Rei Shibata, Yanna Lei, Lina Hu, Chenglin Yu, Guang Yang, Hongxian Wu, Wenhu Xu, Kenji Okumura, Noriyuki Ouchi, Toyoaki Murohara, Masafumi Kuzuya, Xian Wu Cheng
BACKGROUND: Exposure to psychosocial stress is a risk factor for cardiovascular disease, including vascular aging and regeneration. Given that dipeptidyl peptidase-4 (DPP4) regulates several intracellular signaling pathways associated with the glucagon-like peptide-1 (GLP-1) metabolism, we investigated the role of DPP4/GLP-1 axis in vascular senescence and ischemia-induced neovascularization in mice under chronic stress, with a special focus on adiponectin -mediated peroxisome proliferator activated receptor-γ/its co-activator 1α (PGC-1α) activation...
September 28, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28953874/a-reversible-haploid-mouse-embryonic-stem-cell-biobank-resource-for-functional-genomics
#15
Ulrich Elling, Reiner A Wimmer, Andreas Leibbrandt, Thomas Burkard, Georg Michlits, Alexandra Leopoldi, Thomas Micheler, Dana Abdeen, Sergei Zhuk, Irene M Aspalter, Cornelia Handl, Julia Liebergesell, Maria Hubmann, Anna-Maria Husa, Manuela Kinzer, Nicole Schuller, Ellen Wetzel, Nina van de Loo, Jorge Arturo Zepeda Martinez, David Estoppey, Ralph Riedl, Fengtang Yang, Beiyuan Fu, Thomas Dechat, Zoltán Ivics, Chukwuma A Agu, Oliver Bell, Dieter Blaas, Holger Gerhardt, Dominic Hoepfner, Alexander Stark, Josef M Penninger
The ability to directly uncover the contributions of genes to a given phenotype is fundamental for biology research. However, ostensibly homogeneous cell populations exhibit large clonal variance that can confound analyses and undermine reproducibility. Here we used genome-saturated mutagenesis to create a biobank of over 100,000 individual haploid mouse embryonic stem (mES) cell lines targeting 16,970 genes with genetically barcoded, conditional and reversible mutations. This Haplobank is, to our knowledge, the largest resource of hemi/homozygous mutant mES cells to date and is available to all researchers...
October 5, 2017: Nature
https://www.readbyqxmd.com/read/28946938/ldb2-regulates-the-expression-of-dll4-through-the-formation-of-oligomeric-complexes-in-endothelial-cells
#16
Hyun-Jung Choi, Seung-Sik Rho, Dong-Hoon Choi, Young-Guen Kwon
Delta-like ligand 4 (DLL4) expression in endothelial cells is intimately associated with angiogenic sprouting and vascular remodeling, but the precise mechanism of transcriptional regulation of DLL4 remains incompletely understood. Here, we showed that LIM-domain binding protein 2 (LDB2) plays an important role in regulating basal DLL4 and VEGF-induced DLL4 expression. Knockdown of LDB2 using siRNA enhanced endothelial sprouting and tubular network formation in vitro. Injection of ldb2-morpholino resulted in defective development of intersegmental vessels in zebrafish...
September 26, 2017: BMB Reports
https://www.readbyqxmd.com/read/28929580/selective-expression-of-egfp-in-mouse-perivascular-astrocytes-by-modification-of-the-mlc1-gene-using-t2a-based-ribosome-skipping
#17
Jordan J Toutounchian, Joseph H McCarty
Perivascular astrocyte end feet closely juxtapose cerebral blood vessels to regulate important developmental and physiological processes including endothelial cell proliferation and sprouting as well as the formation of the blood-brain barrier (BBB). The mechanisms underlying these events remain largely unknown due to a lack of experimental models for identifying perivascular astrocytes and distinguishing these cell types from other astroglial populations. Megalencephalic leukoencephalopathy with subcortical cysts 1 (Mlc1) is a transmembrane protein that is expressed in perivascular astrocyte end feet where it controls BBB development and homeostasis...
September 20, 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/28927933/azopolymer-photopatterning-for-directional-control-of-angiogenesis
#18
Chiara Fedele, Maria De Gregorio, Paolo A Netti, Silvia Cavalli, Chiara Attanasio
Understanding cellular behavior in response to microenvironmental stimuli is central to tissue engineering. An increasing number of reports emphasize the high sensitivity of cells to the physical characteristics of the surrounding milieu and in particular, topographical cues. In this work, we investigated the influence of dynamic topographic signal presentation on sprout formation and the possibility to obtain a space-time control over sprouting directionality without growth factors, in order to investigate the contribution of just topography in the angiogenic process...
November 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28926106/oroxyloside-inhibits-angiogenesis-through-suppressing-internalization-of-vegfr2-flk-1-in-endothelial-cells
#19
Kai Zhao, Xiaorui Li, Binyan Lin, Dawei Yang, Yuxin Zhou, Zhiyu Li, Qinglong Guo, Na Lu
Increasing flavonoids have been reported to possess anti-angiogenic effects. Inhibition of angiogenesis plays a critical role in the treatment of cancer, especially in advanced metastatic cancer. In this study, we assessed the effect of Oroxylin A-7-glucuronide (Oroxyloside), a main metabolite of Oroxylin A, on angiogenesis in human endothelial cell-like EA.hy926 cells. Oroxyloside suppressed the migration and tube formation of EA.hy926 cells. Meanwhile, microvessels sprouting from aortic rings and new blood vessels on the chicken chorioallantoic membrane (CAM) were also inhibited...
September 19, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28925736/chronological-changes-in-tip-cells-during-sprouting-angiogenesis-of-development-of-the-retinal-vasculature-in-newborn-mice
#20
Chang Sik Cho, Sang-Mok Lee, Byung Joo Lee, Dong Hyun Jo, Jin Hyoung Kim, Jeong Hun Kim, Young Suk Yu
PURPOSE: To investigate a sequential chronological change in tip cells during the development of the retinal vasculature in newborn mice. MATERIALS AND METHODS: Newborn C57BL/6 mice were used for this study. To elucidate the patterns in the developing retinal vasculature, histology, and immunohistochemistry-antiplatelet endothelial cell adhesion molecule-1, anticollagen type IV, isolectin IB4-were performed on sections of mouse retina on postnatal days (P)-4, -8, and -12...
November 2017: Current Eye Research
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