scholarly journals Up-Regulated Expression of Matrix Metalloproteinases in Endothelial Cells Mediates Platelet Microvesicle-Induced Angiogenesis

2017 ◽  
Vol 41 (6) ◽  
pp. 2319-2332 ◽  
Author(s):  
Cheng Sun ◽  
Shi-Bin Feng ◽  
Zheng-Wang Cao ◽  
Jun-Jie Bei ◽  
Qiang Chen ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Network Formation ◽  
Umbilical Vein ◽  
Gelatin Zymography ◽  
Tube Formation ◽  
Angiogenic Factors ◽  
Dependent Manner ◽  
Angiogenic Activity

Background/Aims: Platelet microvesicles (PMVs) contribute to angiogenesis and vasculogenesis, but the mechanisms underlying these contributions have not been fully elucidated. In the present study, we investigated whether PMVs regulate the angiogenic properties of endothelial cells (ECs) via mechanisms extending beyond the transport of angiogenic regulators from platelets. Methods: In vitro Matrigel tube formation assay and in vivo Matrigel plug assay were used to evaluate the pro-angiogenic activity of PMVs. The effects of PMVs on the migration of human umbilical vein endothelial cells (HUVECs) were detected by transwell assay and wound-healing assay. Real-time PCR and western blot were conducted to examine mRNA and protein expression of pro-angiogenic factors in HUVECs. Matrix metalloproteinase (MMP) activity was assayed by gelatin zymography. Moreover, the effects of specific MMP inhibitors were tested. Results: PMVs promoted HUVEC capillary-like network formation in a dose-dependent manner. Meanwhile, PMVs dose-dependently facilitated HUVEC migration. Levels of MMP-2 and MMP-9 expression and activity were up-regulated in HUVECs stimulated with PMVs. Inhibition of MMPs decreased their pro-angiogenic and pro-migratory effects on HUVECs. Moreover, we confirmed the pro-angiogenic activity of PMVs in vivo in mice with subcutaneous implantation of Matrigel, and demonstrated that blockade of MMPs attenuated PMV-induced angiogenesis. Conclusion: The findings of our study indicate that PMVs promote angiogenesis by up-regulating MMP expression in ECs via mechanism extending beyond the direct delivery of angiogenic factors.

Accutin, a New Disintegrin, Inhibits Angiogenesis In Vitro and In Vivo by Acting as Integrin vβ3 Antagonist and Inducing Apoptosis

Blood ◽  
1998 ◽  
Vol 92 (9) ◽  
pp. 3268-3276 ◽  
Author(s):  
Chia Hsin Yeh ◽  
Hui-Chin Peng ◽  
Tur-Fu Huang
Keyword(s):  
Endothelial Cells ◽  
Umbilical Vein ◽  
Fluorescein Isothiocyanate ◽  
Adenosine Diphosphate ◽  
Tube Formation ◽  
Platelet Glycoprotein ◽  
Dependent Manner ◽  
Antiangiogenic Effect

Abstract Endothelial integrins play an essential role in angiogenesis and cell survival. Accutin, a new member of disintegrin family derived from venom of Agkistrodon acutus, potently inhibited human platelet aggregation caused by various agonists (eg, thrombin, collagen, and, adenosine diphosphate [ADP]) through the blockade of fibrinogen binding to platelet glycoprotein IIb/IIIa (ie, integrin IIbβ3). In this report, we describe that accutin specifically inhibited the binding of monoclonal antibody (MoAb) 7E3, which recognizes integrin vβ3, to human umbilical vein endothelial cells (HUVECs), but not those of other anti-integrin MoAbs such as 2β1, 3β1, and 5β1. Moreover, accutin, but not the control peptide GRGES, dose-dependently inhibited the 7E3 interaction with HUVECs. Both 7E3 and GRGDS, but not GRGES or Integrelin, significantly blocked fluorescein isothiocyanate-conjugated accutin binding to HUVEC. In functional studies, accutin exhibited inhibitory effects on HUVEC adhesion to immobilized fibrinogen, fibronectin and vitronectin, and the capillary-like tube formation on Matrigel in a dose- and RGD-dependent manner. In addition, it exhibited an effective antiangiogenic effect in vivo when assayed by using the 10-day-old embryo chick CAM model. Furthermore, it potently induced HUVEC apoptotic DNA fragmentation as examined by electrophoretic and flow cytometric assays. In conclusion, accutin inhibits angiogenesis in vivo and in vitro by blocking integrin vβ3 of endothelial cells and by inducing apoptosis. The antiangiogenic activity of disintegrins might be explored as the target of developing the potential antimetastatic agents. © 1998 by The American Society of Hematology.

Accutin, a New Disintegrin, Inhibits Angiogenesis In Vitro and In Vivo by Acting as Integrin vβ3 Antagonist and Inducing Apoptosis

Blood ◽  
1998 ◽  
Vol 92 (9) ◽  
pp. 3268-3276 ◽  
Author(s):  
Chia Hsin Yeh ◽  
Hui-Chin Peng ◽  
Tur-Fu Huang
Keyword(s):  
Endothelial Cells ◽  
Umbilical Vein ◽  
Fluorescein Isothiocyanate ◽  
Adenosine Diphosphate ◽  
Tube Formation ◽  
Platelet Glycoprotein ◽  
Dependent Manner ◽  
Antiangiogenic Effect

Endothelial integrins play an essential role in angiogenesis and cell survival. Accutin, a new member of disintegrin family derived from venom of Agkistrodon acutus, potently inhibited human platelet aggregation caused by various agonists (eg, thrombin, collagen, and, adenosine diphosphate [ADP]) through the blockade of fibrinogen binding to platelet glycoprotein IIb/IIIa (ie, integrin IIbβ3). In this report, we describe that accutin specifically inhibited the binding of monoclonal antibody (MoAb) 7E3, which recognizes integrin vβ3, to human umbilical vein endothelial cells (HUVECs), but not those of other anti-integrin MoAbs such as 2β1, 3β1, and 5β1. Moreover, accutin, but not the control peptide GRGES, dose-dependently inhibited the 7E3 interaction with HUVECs. Both 7E3 and GRGDS, but not GRGES or Integrelin, significantly blocked fluorescein isothiocyanate-conjugated accutin binding to HUVEC. In functional studies, accutin exhibited inhibitory effects on HUVEC adhesion to immobilized fibrinogen, fibronectin and vitronectin, and the capillary-like tube formation on Matrigel in a dose- and RGD-dependent manner. In addition, it exhibited an effective antiangiogenic effect in vivo when assayed by using the 10-day-old embryo chick CAM model. Furthermore, it potently induced HUVEC apoptotic DNA fragmentation as examined by electrophoretic and flow cytometric assays. In conclusion, accutin inhibits angiogenesis in vivo and in vitro by blocking integrin vβ3 of endothelial cells and by inducing apoptosis. The antiangiogenic activity of disintegrins might be explored as the target of developing the potential antimetastatic agents.© 1998 by The American Society of Hematology.

scholarly journals Evaluation of Angiogenesis Assays

Biomedicines ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 37 ◽  
Author(s):  
Zachary I. Stryker ◽  
Mehdi Rajabi ◽  
Paul J. Davis ◽  
Shaker A. Mousa
Keyword(s):  
Endothelial Cells ◽  
Tube Formation ◽  
Angiogenic Activity ◽  
In Vitro Methods ◽  
Current State ◽  
Angiogenesis Process ◽  
Pertinent Information ◽  
Exogenous Factors

Angiogenesis assays allow for the evaluation of pro- or anti-angiogenic activity of endogenous or exogenous factors (stimulus or inhibitors) through investigation of their pro-or anti- proliferative, migratory, and tube formation effects on endothelial cells. To model the process of angiogenesis and the effects of biomolecules on that process, both in vitro and in vivo methods are currently used. In general, in vitro methods monitor specific stages in the angiogenesis process and are used for early evaluations, while in vivo methods more accurately simulate the living microenvironment to provide more pertinent information. We review here the current state of angiogenesis assays as well as their mechanisms, advantages, and limitations.

scholarly journals DEPTOR Deficiency-Mediated mTORc1 Hyperactivation in Vascular Endothelial Cells Promotes Angiogenesis

2018 ◽  
Vol 46 (2) ◽  
pp. 520-531 ◽  
Author(s):  
Yan Ding ◽  
Lanlan Shan ◽  
Wenqing Nai ◽  
Xiaojun Lin ◽  
Ling Zhou ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Signaling Pathway ◽  
Molecular Mechanisms ◽  
Gene Knockout ◽  
Umbilical Vein ◽  
Vascular Endothelial Cell ◽  
Tube Formation ◽  
Vascular Endothelial

Background/Aims: The mechanistic target of rapamycin (mTOR) signaling pathway is essential for angiogenesis and embryonic development. DEP domain-containing mTOR-interacting protein (DEPTOR) is an mTOR binding protein that functions to inhibit the mTOR pathway In vitro experiments suggest that DEPTOR is crucial for vascular endothelial cell (EC) activation and angiogenic responses. However, knowledge of the effects of DEPTOR on angiogenesis in vivo is limited. This study aimed to determine the role of DEPTOR in tissue angiogenesis and to elucidate the molecular mechanisms. Methods: Cre/loxP conditional gene knockout strategy was used to delete the Deptor gene in mouse vascular ECs. The expression or distribution of cluster of differentiation 31 (CD31), vascular endothelial growth factor (VEGF) and hypoxia inducible factor-1 alpha (HIF-1α) were detected by immunohistochemical staining or western blot. Tube formation assay was used to measure angiogenesis in vitro. Results: Deptor knockdown led to increased expression of CD31, VEGF and HIF-1α in heart, liver, kidney and aorta. After treatment with rapamycin, their expression was significantly down regulated. In vitro, human umbilical vein endothelial cells (HUVECs) were transfected with DEPTOR-specific small interfering RNA (siRNA), which resulted in a significant increase in endothelial tube formation and migration rates. In contrast, DEPTOR overexpression markedly reduced the expression of CD31, VEGF and HIF-1α. Conclusions: Our findings demonstrated that deletion of the Deptor gene in vascular ECs resulted in upregulated expression of CD31 and HIF-1α, and further stimulated the expression of VEGF which promoted angiogenesis, indicating that disruption of normal angiogenic pathways may occur through hyperactivation of the mTORC1/HIF-1α/VEGF signaling pathway.

scholarly journals Study of pro-angiogenic activity of astilbin on human umbilical vein endothelial cells in vitro and zebrafish in vivo

RSC Advances ◽  
2019 ◽  
Vol 9 (40) ◽  
pp. 22921-22930 ◽  
Author(s):  
Kongpeng Lv ◽  
Qin Ren ◽  
Xingyan Zhang ◽  
Keda Zhang ◽  
Jia Fei ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Umbilical Vein ◽  
Angiogenic Activity ◽  
Human Umbilical Vein ◽  
Umbilical Vein Endothelial Cells

Pro-angiogenic activity of astilbin on endothelial cells in vitro and zebrafish in vivo.

scholarly journals Aspergillus fumigatus inhibits angiogenesis through the production of gliotoxin and other secondary metabolites

Blood ◽  
2009 ◽  
Vol 114 (26) ◽  
pp. 5393-5399 ◽  
Author(s):  
Ronen Ben-Ami ◽  
Russell E. Lewis ◽  
Konstantinos Leventakos ◽  
Dimitrios P. Kontoyiannis
Keyword(s):  
Invasive Aspergillosis ◽  
Aspergillus Fumigatus ◽  
Capillary Tube ◽  
Umbilical Vein ◽  
Tube Formation ◽  
Dependent Manner ◽  
Antiangiogenic Effect ◽  
Umbilical Vein Endothelial Cells

AbstractIn susceptible hosts, angioinvasion by Aspergillus fumigatus triggers thrombosis, hypoxia, and proinflammatory cytokine release, all of which are stimuli for angiogenesis. We sought to determine whether A fumigatus directly modulates angiogenesis. A fumigatus culture filtrates profoundly inhibited the differentiation, migration, and capillary tube formation of human umbilical vein endothelial cells in vitro. To measure angiogenesis at the site of infection, we devised an in vivo Matrigel assay in cyclophosphamide-treated BALB/c mice with cutaneous invasive aspergillosis. Angiogenesis was significantly suppressed in Matrigel plugs implanted in A fumigatus–infected mice compared with plugs from uninfected control mice. The antiangiogenic effect of A fumigatus was completely abolished by deletion of the global regulator of secondary metabolism, laeA, and to a lesser extent by deletion of gliP, which controls gliotoxin production. Moreover, pure gliotoxin potently inhibited angiogenesis in vitro in a dose-dependent manner. Finally, overexpression of multiple angiogenesis mediator–encoding genes was observed in the lungs of cortisone-treated mice during early invasive aspergillosis, whereas gene expression returned rapidly to baseline levels in cyclophosphamide/cortisone-treated mice. Taken together, these results indicate that suppression of angiogenesis by A fumigatus both in vitro and in a neutropenic mouse model is mediated through secondary metabolite production.

scholarly journals Role of Glial Cell Line-Derived Neurotrophic Factor in Adipose Tissue Extract-Induced Angiogenesis in Mice

2021 ◽  
Author(s):  
Renpeng Zhou ◽  
Chuang Yin ◽  
Weiwei Bian ◽  
Chen Wang
Keyword(s):  
Skin Graft ◽  
Umbilical Vein ◽  
Skin Condition ◽  
Tube Formation ◽  
Vascular Density ◽  
Dependent Manner ◽  
Dermal Thickness ◽  
Umbilical Vein Endothelial Cells

Abstract Our present study is aimed to evaluate the effects of adipose-derived extracts (AT-Ex) and GDNF within the extracts on skin graft. AT-Ex was harvest from fresh human lipoaspirates with centrifugation, emulsification and lysing by cycles of freeze and thawing. Concentrations of GDNF, VEGF and bFGF were detected by ELISA. AT-Ex and anti-GDNF-antibody-coupled AT-Ex were further used to test their ability to promote tube formation using human umbilical vein endothelial cells (HUVECs) and stimulate angiogenesis in nude skin-graft models. The results demonstrated that abundant GDNF, VEGF and bFGF were detected in AT-Ex, with GDNF displaying the highest concentration. AT-Ex significantly promoted the tube formation ability of HUVECs in vitro, with a dosage-dependent manner, while this ability was partially impaired when the anti-GDNF antibody was conjugated. In vivo, The AT-Ex treatment increased dermal thickness, augmented dermal proliferation and increased vascular density and GDNF contributed greatly to the AT-Ex effect in improvement the grafted skin condition by promoting angiogenesis in vivo. Our results suggested that critical effect of GDNF from AT-Ex on improvement skin graft condition.

scholarly journals Korean Propolis Suppresses Angiogenesis through Inhibition of Tube Formation and Endothelial Cell Proliferation

2014 ◽  
Vol 9 (4) ◽  
pp. 1934578X1400900 ◽  
Author(s):  
Seon-Il Park ◽  
Toshiro Ohta ◽  
Shigenori Kumazawa ◽  
Mira Jun ◽  
Mok-Ryeon Ahn
Keyword(s):  
Umbilical Vein ◽  
Chorioallantoic Membrane ◽  
Tube Formation ◽  
In Vitro Models ◽  
Endothelial Cell Proliferation ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Korean Propolis

Propolis, a sticky material that honeybees collect from living plants, has been used for its pharmaceutical properties since ancient times. In this study, we examined the effects of ethanol extracts of Korean propolis (EEKP) from various geographic regions on the inhibition of angiogenesis, both in vitro and in vivo. The effects of EEKP were tested on in vitro models of angiogenesis, that is, tube formation and proliferation of human umbilical vein endothelial cells (HUVECs). All EEKP samples exhibited significant inhibitory effects on tube formation of HUVECs in a concentration-dependent manner (6.25-25 μg/mL). In addition, two EEKP samples, prepared from Uijeongbu and Pyoseon propolis, significantly suppressed the proliferation of HUVECs in a concentration-dependent manner (3.13-25 μg/mL). Furthermore, in an in vivo angiogenesis assay using the chick embryo chorioallantoic membrane (CAM) system, we found that the two EEKP samples significantly reduced the number of newly formed vessels. These results indicate that Korean propolis may have potential applications in the prevention and treatment of angiogenesis-related diseases such as cancer.

scholarly journals P11.30 Special VEGF90kDa form in exosome from GBM cells activates TAZ in endothelial cells to promote angiogenesis and contributes bevacizumab resistance

2019 ◽  
Vol 21 (Supplement_3) ◽  
pp. iii49-iii49
Author(s):  
Z Wang ◽  
Y Yuan ◽  
C Xu ◽  
Y Liu
Keyword(s):  
Endothelial Cells ◽  
Western Blotting ◽  
Umbilical Vein ◽  
Tube Formation ◽  
Cellular Migration ◽  
Vegf Expression ◽  
Angiogenic Potential ◽  
Huvec Cells

Abstract BACKGROUND Glioblastoma (GBM) has obvious blood vessels proliferation, which is one of the important histological diagnostic criteria. Bevacizumab, VEGF targeted inhibitor, is found inefficient in 2/3 cases after the clinical trial. Here, we found a specific 90kDa form of VEGF (VEGF90K) in exosomes of GBM could activate TAZ expression in endothelial cells to promote angiogenesis, which might also contribute to Bevacizumab treatment resistance. MATERIAL AND METHODS Exosomes were isolated from U87, LN229 GBM cell culture medium and characterized using transmission electron microscopy, nanoparticle analysis, and western blotting. VEGF expression in GBM and TAZ expression in human umbilical vein endothelial cells (HUVEC) are inhibited by shRNA. In vitro migration, proliferation, and tube formation assays were used to assess the angiogenic potential of HUVEC cells. Western blotting was used to analysis TAZ expression in HUVEC. Bevacizumab or exosome inhibitor GW4869 were used separately or together to evaluation their blocking effects on angiogenic functions of GBM cells. RESULTS we found a unique 90kDa form of VEGF (VEGF90K) from exosome of GBM cells could activate TAZ expression in HUVEC cells which correlated with higher levels of cellular migration, proliferation, and tube formation. Knockdown VEGF expression in GBM exosomes or TAZ expression in HUVEC cells could decrease the angiogenic function of GBM cells. GW4869 combine Bevacizumab had significantly inhibited the angiogenic ability of GBM cells in vivo and in vitro. CONCLUSION A specific exosome-associated VEGF from GBM can promote angiogenesis by activating TAZ expression in endothelial cells. Targeted inhibition of exosome secretion can significantly inhibit tumor angiogenesis and restore bevacizumab effect. Our study highlights the unique properties of VEGF in exosome which might help to explore new treatment strategies of GBM.

scholarly journals Aspartame induces angiogenesis in vitro and in vivo models

2014 ◽  
Vol 34 (3) ◽  
pp. 260-265 ◽  
Author(s):  
F Yesildal ◽  
FN Aydin ◽  
S Deveci ◽  
S Tekin ◽  
I Aydin ◽  
...  
Keyword(s):  
Wound Healing ◽  
Umbilical Vein ◽  
Tube Formation ◽  
Control Group ◽  
Dependent Manner ◽  
Xtt Assay ◽  
Skin Wound Healing ◽  
In Vivo Models

Angiogenesis is the process of generating new blood vessels from preexisting vessels and is considered essential in many pathological conditions. The purpose of the present study is to evaluate the effect of aspartame on angiogenesis in vivo chick chorioallantoic membrane (CAM) and wound-healing models as well as in vitro 2,3-bis-2 H-tetrazolium-5-carboxanilide (XTT) and tube formation assays. In CAM assay, aspartame increased angiogenesis in a concentration-dependent manner. Compared with the control group, aspartame has significantly increased vessel proliferation ( p < 0.001). In addition, in vivo rat model of skin wound-healing study showed that aspartame group had better healing than control group, and this was statistically significant at p < 0.05. There was a slight proliferative effect of aspartame on human umbilical vein endothelial cells on XTT assay in vitro, but it was not statistically significant; and there was no antiangiogenic effect of aspartame on tube formation assay in vitro. These results provide evidence that aspartame induces angiogenesis in vitro and in vivo; so regular use may have undesirable effect on susceptible cases.

Sign in / Sign up

Export Citation Format

Share Document