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Showing 1 - 200 of 3562 Journals sorted alphabetically
16 de Abril     Open Access  
AADE in Practice     Hybrid Journal   (Followers: 4)
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Abia State University Medical Students' Association Journal     Full-text available via subscription  
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Aktuelle Ernährungsmedizin     Hybrid Journal   (Followers: 4)
Al-Azhar Assiut Medical Journal     Open Access  
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Allgemeine Homöopathische Zeitung     Hybrid Journal   (Followers: 2)
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American Journal of Biomedical Engineering     Open Access   (Followers: 12)
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American Journal of Chinese Medicine, The     Hybrid Journal   (Followers: 5)
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American Journal on Addictions     Hybrid Journal   (Followers: 10)
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Amyloid: The Journal of Protein Folding Disorders     Hybrid Journal   (Followers: 4)
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Anales del Sistema Sanitario de Navarra     Open Access   (Followers: 1)
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Angiogenesis     Hybrid Journal   (Followers: 3)
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Annual Review of Medicine     Full-text available via subscription   (Followers: 17)
Anthropological Review     Open Access   (Followers: 24)
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Antibiotics     Open Access   (Followers: 9)
Antibodies     Open Access   (Followers: 2)
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Anuradhapura Medical Journal     Open Access  
Anwer Khan Modern Medical College Journal     Open Access   (Followers: 2)
Apmis     Hybrid Journal   (Followers: 1)
Apparence(s)     Open Access   (Followers: 1)
Applied Clinical Informatics     Hybrid Journal   (Followers: 2)
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Applied Medical Informatics     Open Access   (Followers: 10)
Arab Journal of Nephrology and Transplantation     Open Access   (Followers: 1)
Arak Medical University Journal     Open Access  
Archive of Clinical Medicine     Open Access   (Followers: 1)
Archive of Community Health     Open Access  
Archives of Biomedical Sciences     Open Access   (Followers: 7)
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Archives of Trauma Research     Open Access   (Followers: 2)
Archivos de Medicina (Manizales)     Open Access  
ArgoSpine News & Journal     Hybrid Journal  
Arquivos Brasileiros de Oftalmologia     Open Access  
Arquivos de Ciências da Saúde     Open Access  
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Ars Medica : Revista de Ciencias Médicas     Open Access  
ARS Medica Tomitana     Open Access   (Followers: 1)
Art Therapy: Journal of the American Art Therapy Association     Full-text available via subscription   (Followers: 10)
Arterial Hypertension     Open Access  
Artificial Intelligence in Medicine     Hybrid Journal   (Followers: 12)
Artificial Organs     Hybrid Journal   (Followers: 1)
Asia Pacific Family Medicine     Open Access  
Asia Pacific Journal of Clinical Nutrition     Full-text available via subscription   (Followers: 9)
Asia Pacific Journal of Clinical Trials : Nervous System Diseases     Open Access  
Asian Bioethics Review     Full-text available via subscription   (Followers: 2)
Asian Journal of Cell Biology     Open Access   (Followers: 6)
Asian Journal of Health     Open Access   (Followers: 3)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 2)
Asian Journal of Medical and Pharmaceutical Researches     Open Access   (Followers: 1)
Asian Journal of Medical Sciences     Open Access   (Followers: 1)
Asian Journal of Scientific Research     Open Access   (Followers: 2)
Asian Journal of Transfusion Science     Open Access   (Followers: 2)
Asian Medicine     Hybrid Journal   (Followers: 4)
Asian Pacific Journal of Cancer Prevention     Open Access  
ASPIRATOR : Journal of Vector-borne Disease Studies     Open Access  
Astrocyte     Open Access  
Atención Familiar     Open Access  
Atención Primaria     Open Access   (Followers: 1)
Audiology - Communication Research     Open Access   (Followers: 8)
Auris Nasus Larynx     Full-text available via subscription  
Australian Coeliac     Full-text available via subscription   (Followers: 2)
Australian Family Physician     Full-text available via subscription   (Followers: 3)
Australian Journal of Medical Science     Full-text available via subscription   (Followers: 1)
Autopsy and Case Reports     Open Access  
Aviation, Space, and Environmental Medicine     Full-text available via subscription   (Followers: 10)
Avicenna     Open Access   (Followers: 2)
Avicenna Journal of Medicine     Open Access   (Followers: 1)
Bangabandhu Sheikh Mujib Medical University Journal     Open Access   (Followers: 1)
Bangladesh Journal of Anatomy     Open Access   (Followers: 1)
Bangladesh Journal of Bioethics     Open Access  
Bangladesh Journal of Medical Biochemistry     Open Access   (Followers: 3)
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Basal Ganglia     Hybrid Journal  
Basic Sciences of Medicine     Open Access   (Followers: 2)
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BC Medical Journal     Free  
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Bijzijn XL     Hybrid Journal   (Followers: 1)
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BioDiscovery     Open Access   (Followers: 2)
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Bioethics     Hybrid Journal   (Followers: 14)
Bioethics Research Notes     Full-text available via subscription   (Followers: 14)
Biologics in Therapy     Open Access  

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Journal Cover Angiogenesis
  [SJR: 2.212]   [H-I: 69]   [3 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1573-7209 - ISSN (Online) 0969-6970
   Published by Springer-Verlag Homepage  [2355 journals]
  • Pre-culture in endothelial growth medium enhances the angiogenic
           properties of adipose-derived stem/stromal cells
    • Authors: Lucas E. B. Souza; Liziane R. Beckenkamp; Lays M. Sobral; Daianne M. C. Fantacini; Fernanda U. F. Melo; Josiane S. Borges; Andréia M. Leopoldino; Simone Kashima; Dimas Tadeu Covas
      Pages: 15 - 22
      Abstract: Considerable progress has been made on the development of adipose-derived stem/stromal cells (ASCs) as pro-angiogenic therapeutic tools. However, variable clinical results highlight the need for devising strategies to enhance their therapeutic efficacy. Since ASCs proliferate and stabilize newly formed vessels during the angiogenic phase of adipose tissue formation, we hypothesized that mimicking an angiogenic milieu during culture of ASCs would enhance their capacity to support endothelial cell survival and angiogenesis. To test this, we compared the effect of an endothelial growth medium (EGM-2) and conventional media (αMEM) on the progenitor and angiogenic properties of ASCs. ASCs cultured in EGM-2 (ASC-EGM) displayed the highest clonogenic efficiency, proliferative potential and multilineage potential. After co-culture under growth factor starvation, only ASC-EGM attenuated luciferase-expressing human umbilical vein endothelial cells (HUVECluc) apoptosis and supported the formation of endothelial cords in a dose-dependent manner. These effects were recapitulated by the conditioned medium of ASC-EGM, which displayed a 100-fold higher expression of hepatocyte growth factor in comparison with ASC-αMEM. Next, HUVECluc and ASCs were co-transplanted subcutaneously into immunodeficient mice, and the survival of HUVECluc was monitored by bioluminescent imaging. After 60 days, the survival of HUVECluc transplanted alone was equivalent to that of HUVECluc co-transplanted with ASC-αMEM (15.0 ± 0.7 vs. 13.0 ± 0.5%). Strikingly, co-transplantation with ASC-EGM increased HUVECluc survival to 105.0 ± 3.5%, and the resulting organoids displayed functional vasculature with the highest human-derived vascular area. These findings demonstrate that pre-conditioning of ASCs in endothelial growth medium augment their pro-angiogenic properties and could enhance their therapeutic efficacy against ischemic diseases.
      PubDate: 2018-02-01
      DOI: 10.1007/s10456-017-9579-0
      Issue No: Vol. 21, No. 1 (2018)
  • Antiangiogenesis and medical therapy failure in intracranial
    • Authors: Nestor R. Gonzalez; Raymond Liou; Florian Kurth; Hao Jiang; Jeffrey Saver
      Pages: 23 - 35
      Abstract: Intracranial atherosclerotic disease (ICAD) is one of the most common causes of stroke worldwide and the one with the worst prognosis. In this study, we assessed the hypothesis that the balance of circulating pro- and antiangiogenic factors plays a role in the evolution of the disease and can be used as a potential marker for the disease course and a target for treatment. Seventy-four patients with severe ICAD were enrolled in this prospective observational study, medically optimized, and followed for 6 months. Thirteen pro- and eight antiangiogenic factors were measured in the participants’ serum using a sandwich multiplex ELISA. Angiogenic profiles were calculated using principal component analysis. We tested the association between angiogenic profiles and recurring cerebrovascular events despite intensive medical therapy, disability at 6 months after enrollment, and angiographic neovascularization in patients who failed medical treatment and underwent indirect revascularization surgery. There is a strong association between a functionally antiangiogenic profile and recurrent stroke or TIA in patients with ICAD (OR = 7.2, CI 2.4–34.4). Multivariable regression analysis showed that this antiangiogenic profile was also associated with poor functional status after 6 months (p = 0.002), independent from other clinical features such as history of previous stroke, diabetes, and age. In patients who failed medical management and underwent indirect revascularization surgery, high endostatin and angiostatin levels were also associated with low angiographic neovascularization (p = 0.02). The results of this study point to the striking importance of antiangiogenesis as a determinant of ICAD patient prognosis and suggest a possible new target for therapy.
      PubDate: 2018-02-01
      DOI: 10.1007/s10456-017-9578-1
      Issue No: Vol. 21, No. 1 (2018)
  • Notch signaling controls sprouting angiogenesis of endometriotic lesions
    • Authors: Christina Körbel; Miriam D. Gerstner; Michael D. Menger; Matthias W. Laschke
      Pages: 37 - 46
      Abstract: Angiogenesis is essential for the engraftment and growth of endometriotic lesions. In this study, we analyzed whether this process is regulated by Notch signaling. Endometriotic lesions were induced by endometrial tissue transplantation into dorsal skinfold chambers of C57BL/6 mice, which were treated with the γ-secretase inhibitor DAPT or vehicle. Vascularization, morphology, and proliferation of the newly developing lesions were analyzed using intravital fluorescence microscopy, histology, and immunohistochemistry over 14 days. Inhibition of Notch signaling by DAPT significantly increased the number of angiogenic sprouts within the endometrial grafts during the first days after transplantation when compared to vehicle-treated controls. This was associated with an accelerated vascularization, as indicated by a higher functional microvessel density of DAPT-treated lesions on day 6. However, inhibition of Notch signaling did not affect the morphology and proliferating activity of the lesions, as previously described for tumors. Both DAPT- and vehicle-treated lesions finally consisted of cyst-like dilated glands, which were surrounded by a well-vascularized stroma and contained comparable numbers of proliferating cell nuclear antigen-positive cells. These findings demonstrate that sprouting angiogenesis in endometriotic lesions is controlled by Notch signaling. However, inhibition of Notch signaling does not have beneficial therapeutic effects on lesion development.
      PubDate: 2018-02-01
      DOI: 10.1007/s10456-017-9580-7
      Issue No: Vol. 21, No. 1 (2018)
  • N - tert -butyloxycarbonyl-Phe-Leu-Phe-Leu-Phe (BOC2) inhibits the
           angiogenic activity of heparin-binding growth factors
    • Authors: Imtiaz M. Nawaz; Paola Chiodelli; Sara Rezzola; Giuseppe Paganini; Michela Corsini; Alessio Lodola; Alessio Di Ianni; Marco Mor; Marco Presta
      Pages: 47 - 59
      Abstract: The peptides N-tert-butyloxycarbonyl-Phe-Leu-Phe-Leu-Phe (BOC2) and BOC-Met-Leu-Phe (BOC1) are widely used antagonists of formyl peptide receptors (FPRs), BOC2 acting as an FPR1/FPR2 antagonist whereas BOC1 inhibits FPR1 only. Extensive investigations have been performed by using these FPR antagonists as a tool to assess the role of FPRs in physiological and pathological conditions. Based on previous observations from our laboratory, we assessed the possibility that BOC2 may exert also a direct inhibitory effect on the angiogenic activity of vascular endothelial growth factor-A (VEGF-A). Our data demonstrate that BOC2, but not BOC1, inhibits the angiogenic activity of heparin-binding VEGF-A165 with no effect on the activity of the non-heparin-binding VEGF-A121 isoform. Endothelial cell-based bioassays, surface plasmon resonance analysis, and computer modeling indicate that BOC2 may interact with the heparin-binding domain of VEGF-A165, thus competing for heparin interaction and preventing the binding of VEGF-A165 to tyrosine kinase receptor VEGFR2, its phosphorylation and downstream signaling. In addition, BOC2 inhibits the interaction of a variety of heparin-binding angiogenic growth factors with heparin, including fibroblast growth factor 2 (FGF2) whose angiogenic activity is blocked by the compound. Accordingly, BOC2 suppresses the angiogenic potential of human tumor cell lines that co-express VEGF-A and FGF2. Thus, BOC2 appears to act as a novel multi-heparin-binding growth factor antagonist. These findings caution about the interpretation of FPR-focusing experimental data obtained with this compound and set the basis for the design of novel BOC2-derived, FPR independent multi-target angiogenesis inhibitors.
      PubDate: 2018-02-01
      DOI: 10.1007/s10456-017-9581-6
      Issue No: Vol. 21, No. 1 (2018)
  • High-density lipoprotein (HDL) promotes angiogenesis via S1P3-dependent
           VEGFR2 activation
    • Authors: Fengyan Jin; Nina Hagemann; Li Sun; Jiang Wu; Thorsten R. Doeppner; Yun Dai; Dirk M. Hermann
      Abstract: High-density lipoprotein (HDL) has previously been shown to promote angiogenesis. However, the mechanisms by which HDL enhances the formation of blood vessels remain to be defined. To address this, the effects of HDL on the proliferation, transwell migration and tube formation of human umbilical vein endothelial cells were investigated. By examining the abundance and phosphorylation (i.e., activation) of the vascular endothelial growth factor receptor VEGFR2 and modulating the activity of the sphingosine-1 phosphate receptors S1P1–3 and VEGFR2, we characterized mechanisms controlling angiogenic responses in response to HDL exposure. Here, we report that HDL dose-dependently increased endothelial proliferation, migration and tube formation. These events were in association with increased VEGFR2 abundance and rapid VEGFR2 phosphorylation at Tyr1054/Tyr1059 and Tyr1175 residues in response to HDL. Blockade of VEGFR2 activation by the VEGFR2 inhibitor SU1498 markedly abrogated the pro-angiogenic capacity of HDL. Moreover, the S1P3 inhibitor suramin prevented VEGFR2 expression and abolished endothelial migration and tube formation, while the S1P1 agonist CYM-5442 and the S1P2 inhibitor JTE-013 had no effect. Last, the role of S1P3 was further confirmed in regulation of S1P-induced endothelial proliferation, migration and tube formation via up-regulation and activation of VEGFR2. Together, these findings argue that HDL promotes angiogenesis via S1P3-dependent up-regulation and activation of VEGFR2 and also suggest that the S1P–S1P3–VEGFR2 signaling cascades as a novel target for HDL-modulating therapy implicated in vascular remodeling and functional recovery in atherosclerotic diseases such as myocardial infarction and ischemic stroke.
      PubDate: 2018-02-15
      DOI: 10.1007/s10456-018-9603-z
  • Time-dependent LXR/RXR pathway modulation characterizes capillary
           remodeling in inflammatory corneal neovascularization
    • Authors: Anthony Mukwaya; Anton Lennikov; Maria Xeroudaki; Pierfrancesco Mirabelli; Mieszko Lachota; Lasse Jensen; Beatrice Peebo; Neil Lagali
      Abstract: Inflammation in the normally immune-privileged cornea can initiate a pathologic angiogenic response causing vision-threatening corneal neovascularization. Inflammatory pathways, however, are numerous, complex and are activated in a time-dependent manner. Effective resolution of inflammation and associated angiogenesis in the cornea requires knowledge of these pathways and their time dependence, which has, to date, remained largely unexplored. Here, using a model of endogenous resolution of inflammation-induced corneal angiogenesis, we investigate the time dependence of inflammatory genes in effecting capillary regression and the return of corneal transparency. Endogenous capillary regression was characterized by a progressive thinning and remodeling of angiogenic capillaries and inflammatory cell retreat in vivo in the rat cornea. By whole-genome longitudinal microarray analysis, early suppression of VEGF ligand-receptor signaling and inflammatory pathways preceded an unexpected later-phase preferential activation of LXR/RXR, PPARα/RXRα and STAT3 canonical pathways, with a concurrent attenuation of LPS/IL-1 inhibition of RXR function and Wnt/β-catenin signaling pathways. Potent downstream inflammatory cytokines such as Cxcl5, IL-1β, IL-6 and Ccl2 were concomitantly downregulated during the remodeling phase. Upstream regulators of the inflammatory pathways included Socs3, Sparc and ApoE. A complex and coordinated time-dependent interplay between pro- and anti-inflammatory signaling pathways highlights a potential anti-inflammatory role of LXR/RXR, PPARα/RXRα and STAT3 signaling pathways in resolving inflammatory corneal angiogenesis.
      PubDate: 2018-02-14
      DOI: 10.1007/s10456-018-9604-y
  • Visualization of endothelial cell cycle dynamics in mouse using the
           Flt-1/eGFP-anillin system
    • Authors: Katia Herz; Alexandra Becker; Chenyue Shi; Masatsugo Ema; Satoru Takahashi; Michael Potente; Michael Hesse; Bernd K. Fleischmann; Daniela Wenzel
      Abstract: Endothelial cell proliferation is a key process during vascular growth but its kinetics could only be assessed in vitro or ex vivo so far. To enable the monitoring and quantification of cell cycle kinetics in vivo, we have generated transgenic mice expressing an eGFP-anillin construct under control of the endothelial-specific Flt-1 promoter. This construct labels the nuclei of endothelial cells in late G1, S and G2 phase and changes its localization during the different stages of M phase, thereby enabling the monitoring of EC proliferation and cytokinesis. In Flt-1/eGFP-anillin mice, we found eGFP+ signals specifically in Ki67+/PECAM+ endothelial cells during vascular development. Quantification using this cell cycle reporter in embryos revealed a decline in endothelial cell proliferation between E9.5 to E12.5. By time-lapse microscopy, we determined the length of different cell cycle phases in embryonic endothelial cells in vivo and found a M phase duration of about 80 min with 2/3 covering karyokinesis and 1/3 cytokinesis. Thus, we have generated a versatile transgenic system for the accurate assessment of endothelial cell cycle dynamics in vitro and in vivo.
      PubDate: 2018-02-07
      DOI: 10.1007/s10456-018-9601-1
  • Somatic NRAS mutation in patient with generalized lymphatic anomaly
    • Authors: Eugenia Manevitz-Mendelson; Gil S. Leichner; Ortal Barel; Inbal Davidi-Avrahami; Limor Ziv-Strasser; Eran Eyal; Itai Pessach; Uri Rimon; Aviv Barzilai; Abraham Hirshberg; Keren Chechekes; Ninette Amariglio; Gideon Rechavi; Karina Yaniv; Shoshana Greenberger
      Abstract: Generalized lymphatic anomaly (GLA or lymphangiomatosis) is a rare disease characterized by a diffuse proliferation of lymphatic vessels in skin and internal organs. It often leads to progressive respiratory failure and death, but its etiology is unknown. Here, we isolated lymphangiomatosis endothelial cells from GLA tissue. These cells were characterized by high proliferation and survival rates, but displayed impaired capacities for migration and tube formation. We employed whole exome sequencing to search for disease-causing genes and identified a somatic mutation in NRAS. We used mouse and zebrafish model systems to initially evaluate the role of this mutation in the development of the lymphatic system, and we studied the effect of drugs blocking the downstream effectors, mTOR and ERK, on this disease.
      PubDate: 2018-02-03
      DOI: 10.1007/s10456-018-9595-8
  • Glomerular endothelial cell maturation depends on ADAM10, a key regulator
           of Notch signaling
    • Authors: Gregory Farber; Romulo Hurtado; Sarah Loh; Sébastien Monette; James Mtui; Raphael Kopan; Susan Quaggin; Catherine Meyer-Schwesinger; Doris Herzlinger; Rizaldy P. Scott; Carl P. Blobel
      Abstract: The principal function of glomeruli is to filter blood through a highly specialized filtration barrier consisting of a fenestrated endothelium, the glomerular basement membrane and podocyte foot processes. Previous studies have uncovered a crucial role of endothelial a disintegrin and metalloprotease 10 (ADAM10) and Notch signaling in the development of glomeruli, yet the resulting defects have not been further characterized nor understood in the context of kidney development. Here, we used several different experimental approaches to analyze the kidneys and glomeruli from mice lacking ADAM10 in endothelial cells (A10ΔEC mice). Scanning electron microscopy of glomerular casts demonstrated enlarged vascular diameter and increased intussusceptive events in A10ΔEC glomeruli compared to controls. Consistent with these findings, genes known to regulate vessel caliber (Apln, AplnR and Vegfr3) are significantly upregulated in A10ΔEC glomeruli. Moreover, transmission electron microscopy revealed the persistence of diaphragms in the fenestrae of A10ΔEC glomerular endothelial cells, which was corroborated by the elevated expression of the protein PLVAP/PV-1, an integral component of fenestral diaphragms. Analysis of gross renal vasculature by light sheet microscopy showed no major alteration of the branching pattern, indicating a localized importance of ADAM10 in the glomerular endothelium. Since intussusceptions and fenestrae with diaphragms are normally found in developing, but not mature glomeruli, our results provide the first evidence for a crucial role of endothelial ADAM10, a key regulator of Notch signaling, in promoting the development and maturation of the glomerular vasculature.
      PubDate: 2018-02-03
      DOI: 10.1007/s10456-018-9599-4
  • Soluble delta-like 1 homolog (DLK1) stimulates angiogenesis through
           Notch1/Akt/eNOS signaling in endothelial cells
    • Authors: Chao-Cheng Huang; Hsiao-Mei Kuo; Pei-Chang Wu; Shih-Hsuan Cheng; Tzu-Ting Chang; Yi-Chen Chang; Mei-Lang Kung; Deng-Chyang Wu; Jiin-Haur Chuang; Ming-Hong Tai
      Abstract: Aim Delta-like 1 homolog (DLK1) is a non-canonical ligand of Notch signaling, which plays a pivotal role in vascular development and tumor angiogenesis. This study aimed to elucidate the function and mechanism of DLK1 in angiogenesis. Methods and results By using in situ hybridization and immunohistochemical studies, expression analysis revealed a unique vascular tropism of DLK1 in vasculature of neuroblastoma and vascular tumors. Thus, it was hypothesized that DLK1 may be cleaved and then bound to endothelial cells, thereby regulating the endothelial function. To test such hypothesis, soluble DLK1 encompassing DLK1 extracellular domain (DLK1-EC) was generated and validated by its inhibitory function in adipogenesis assay. Recombinant DLK1-EC exhibited the preferential binding capability toward endothelial cells and stimulated the microvessels sprouting in aorta rings. Above all, implantation of DLK1-EC dose-dependently elicited the cornea neovascularization in rats. By using various angiogenesis assays, it was delineated that DLK1-EC stimulated the angiogenesis by promoting the proliferation, motility and tube formation of endothelial cells. By immunoblot and luciferase analysis, it was elucidated that DLK1-EC enhanced the expression and activities of Notch1/Akt/eNOS/Hes-1 signaling in dose- and time-dependent manners. Pharmaceutical blockage of Notch signaling using γ-secretase inhibitor DAPT abrogated the DLK1-EC-induced endothelial migration and Hes-1-driven luciferase activities. Furthermore, Notch1 inactivation by neutralizing antibodies or RNA interference reversed the DLK1-EC-induced angiogenesis. Conclusions The present study unveils the pro-angiogenic function and mechanism of soluble DLK1 through activation of Notch1 signaling in endothelial cells.
      PubDate: 2018-01-30
      DOI: 10.1007/s10456-018-9596-7
  • miRNAs regulate the HIF switch during hypoxia: a novel therapeutic target
    • Authors: Marcin Serocki; Sylwia Bartoszewska; Anna Janaszak-Jasiecka; Renata J. Ochocka; James F. Collawn; Rafał Bartoszewski
      Abstract: The decline of oxygen tension in the tissues below the physiological demand leads to the hypoxic adaptive response. This physiological consequence enables cells to recover from this cellular insult. Understanding the cellular pathways that mediate recovery from hypoxia is therefore critical for developing novel therapeutic approaches for cardiovascular diseases and cancer. The master regulators of oxygen homeostasis that control angiogenesis during hypoxia are hypoxia-inducible factors (HIFs). HIF-1 and HIF-2 function as transcriptional regulators and have both unique and overlapping target genes, whereas the role of HIF-3 is less clear. HIF-1 governs the acute adaptation to hypoxia, whereas HIF-2 and HIF-3 expressions begin during chronic hypoxia in human endothelium. When HIF-1 levels decline, HIF-2 and HIF-3 increase. This switch from HIF-1 to HIF-2 and HIF-3 signaling is required in order to adapt the endothelium to prolonged hypoxia. During prolonged hypoxia, the HIF-1 levels and activity are reduced, despite the lack of oxygen-dependent protein degradation. Although numerous protein factors have been proposed to modulate the HIF pathways, their application for HIF-targeted therapy is rather limited. Recently, the miRNAs that endogenously regulate gene expression via the RNA interference (RNAi) pathway have been shown to play critical roles in the hypoxia response pathways. Furthermore, these classes of RNAs provide therapeutic possibilities to selectively target HIFs and thus modulate the HIF switch. Here, we review the significance of the microRNAs on the relationship between the HIFs under both physiological and pathophysiological conditions.
      PubDate: 2018-01-27
      DOI: 10.1007/s10456-018-9600-2
  • Direct repression of IGF2 is implicated in the anti-angiogenic function of
           microRNA-210 in human retinal endothelial cells
    • Authors: Qinbo Yang; Peiwei Wang; Xiaoye Du; Wenjian Wang; Teng Zhang; Yu Chen
      Abstract: Pathological angiogenesis leads to the development of retinal vasculopathies and causes severe vision impairment. Increased understanding of the mechanisms underlying the angiogenic behavior of retinal endothelial cells helps provide new insights for developing treatment of retinal vasculopathies. Pro-angiogenic function of miR-210 has previously been identified. However, the functional implication of miR-210 in retinal endothelial cells remains unknown. Human retinal microvascular endothelial cells (HRECs) were employed to investigate the impact of miR-210 on the angiogenic capacity of retinal endothelial cells. It was observed that without affecting the viability of HRECs, miR-210 significantly suppressed the migration and capillary-like tube formation in HRECs. Moreover, pro-angiogenic insulin growth factor 2 (IGF2) was newly identified as a direct target of miR-210 in HRECs. MiR-210 decreased the expression of IGF2 at both mRNA and protein levels in HRECs. IGF2-simulated activation of p38 MAPK was attenuated by miR-210 in HRECs. Recombinant IGF2 protein rescued miR-210-induced impairment of tube formation in HRECs. Therefore, in contrast to the previously reported pro-angiogenic function of miR-210, the current work reveals novel anti-angiogenic activity of miR-210 in HRECs. Furthermore, IGF2 is identified for the first time as a direct target of miR-210 in HRECs, adding new mechanistic insights into the expression regulation of pro-angiogenic IGF2 in human retinal endothelial cells. The current work helps increase the understanding of regulatory mechanisms underlying retinal endothelial cell physiology, justifying further evaluation for the therapeutic implications of miR-210/IGF2 interaction in the treatment of related retinal vasculopathies.
      PubDate: 2018-01-15
      DOI: 10.1007/s10456-018-9597-6
  • Selective IKK2 inhibitor IMD0354 disrupts NF-κB signaling to suppress
           corneal inflammation and angiogenesis
    • Authors: Anton Lennikov; Pierfrancesco Mirabelli; Anthony Mukwaya; Mira Schaupper; Muthukumar Thangavelu; Mieszko Lachota; Zaheer Ali; Lasse Jensen; Neil Lagali
      Abstract: Corneal neovascularization is a sight-threatening condition caused by angiogenesis in the normally avascular cornea. Neovascularization of the cornea is often associated with an inflammatory response, thus targeting VEGF-A alone yields only a limited efficacy. The NF-κB signaling pathway plays important roles in inflammation and angiogenesis. Here, we study consequences of the inhibition of NF-κB activation through selective blockade of the IKK complex IκB kinase β (IKK2) using the compound IMD0354, focusing on the effects of inflammation and pathological angiogenesis in the cornea. In vitro, IMD0354 treatment diminished HUVEC migration and tube formation without an increase in cell death and arrested rat aortic ring sprouting. In HUVEC, the IMD0354 treatment caused a dose-dependent reduction in VEGF-A expression, suppressed TNFα-stimulated expression of chemokines CCL2 and CXCL5, and diminished actin filament fibers and cell filopodia formation. In developing zebrafish embryos, IMD0354 treatment reduced expression of Vegf-a and disrupted retinal angiogenesis. In inflammation-induced angiogenesis in the rat cornea, systemic selective IKK2 inhibition decreased inflammatory cell invasion, suppressed CCL2, CXCL5, Cxcr2, and TNF-α expression and exhibited anti-angiogenic effects such as reduced limbal vessel dilation, reduced VEGF-A expression and reduced angiogenic sprouting, without noticeable toxic effect. In summary, targeting NF-κB by selective IKK2 inhibition dampened the inflammatory and angiogenic responses in vivo by modulating the endothelial cell expression profile and motility, thus indicating an important role of NF-κB signaling in the development of pathologic corneal neovascularization.
      PubDate: 2018-01-13
      DOI: 10.1007/s10456-018-9594-9
  • Oxidized phospholipids stimulate production of stem cell factor via
           NRF2-dependent mechanisms
    • Authors: Taras Afonyushkin; Olga V. Oskolkova; Valery N. Bochkov
      Abstract: Receptor tyrosine kinase c-Kit and its ligand stem cell factor (SCF) regulate resident vascular wall cells and recruit circulating progenitors. We tested whether SCF may be induced by oxidized palmitoyl-arachidonoyl-phosphatidylcholine (OxPAPC) known to accumulate in atherosclerotic vessels. Gene expression analysis demonstrated OxPAPC-induced upregulation of SCF mRNA and protein in different types of endothelial cells (ECs). Elevated levels of SCF mRNA were observed in aortas of ApoE−/− knockout mice. ECs produced biologically active SCF because conditioned medium from OxPAPC-treated cells stimulated activation (phosphorylation) of c-Kit in naïve ECs. Induction of SCF by OxPAPC was inhibited by knocking down transcription factor NRF2. Inhibition or stimulation of NRF2 by pharmacological or molecular tools induced corresponding changes in SCF expression. Finally, we observed decreased levels of SCF mRNA in aortas of NRF2 knockout mice. We characterize OxPLs as a novel pathology-associated stimulus inducing expression of SCF in endothelial cells. Furthermore, our data point to transcription factor NRF2 as a major mediator of OxPL-induced upregulation of SCF. This mechanism may represent one of the facets of pleiotropic action of NRF2 in vascular wall.
      PubDate: 2018-01-12
      DOI: 10.1007/s10456-017-9590-5
  • AAV-mediated gene delivery of the calreticulin anti-angiogenic domain
           inhibits ocular neovascularization
    • Authors: Leilei Tu; Jiang-Hui Wang; Veluchamy A. Barathi; Selwyn M. Prea; Zheng He; Jia Hui Lee; James Bender; Anna E. King; Grant J. Logan; Ian E. Alexander; Youn-Shen Bee; Ming-Hong Tai; Gregory J. Dusting; Bang V. Bui; Jingxiang Zhong; Guei-Sheung Liu
      Abstract: Ocular neovascularization is a common pathological feature in diabetic retinopathy and neovascular age-related macular degeneration that can lead to severe vision loss. We evaluated the therapeutic efficacy of a novel endogenous inhibitor of angiogenesis, the calreticulin anti-angiogenic domain (CAD180), and its functional 112-residue fragment, CAD-like peptide 112 (CAD112), delivered using a self-complementary adeno-associated virus serotype 2 (scAAV2) in rodent models of oxygen-induced retinopathy and laser-induced choroidal neovascularization. The expression of CAD180 and CAD112 was elevated in human umbilical vein endothelial cells transduced with scAAV2-CAD180 or scAAV2-CAD112, respectively, and both inhibited angiogenic activity in vitro. Intravitreal gene delivery of scAAV2-CAD180 or scAAV2-CAD112 significantly inhibited ischemia-induced retinal neovascularization in rat eyes (CAD180: 52.7% reduction; CAD112: 49.2% reduction) compared to scAAV2-mCherry, as measured in retinal flatmounts stained with isolectin B4. Moreover, the retinal structure and function were unaffected by scAAV2-CAD180 or scAAV2-CAD112, as measured by optical coherence tomography and electroretinography. Moreover, subretinal delivery of scAAV2-CAD180 or scAAV2-CAD112 significantly attenuated laser-induced choroidal neovascularization in mouse eyes compared to scAAV2-mCherry, as measured by fundus fluorescein angiography (CAD180: 62.4% reduction; CAD112: 57.5% reduction) and choroidal flatmounts (CAD180: 40.21% reduction; CAD112: 43.03% reduction). Gene delivery using scAAV2-CAD180 or scAAV2-CAD112 has significant potential as a therapeutic option for the management of ocular neovascularization.
      PubDate: 2018-01-09
      DOI: 10.1007/s10456-017-9591-4
  • 12th International HHT Scientific Conference
    • PubDate: 2017-11-20
      DOI: 10.1007/s10456-017-9584-3
  • Dimethylarginine dimethylaminohydrolase-1 (DDAH1) is frequently
           upregulated in prostate cancer, and its overexpression conveys tumor
           growth and angiogenesis by metabolizing asymmetric dimethylarginine (ADMA)
    • Authors: Karthik Reddy Kami Reddy; Chandrashekhar Dasari; Divya Duscharla; Bhukya Supriya; N. Sai Ram; M. V. Surekha; Jerald Mahesh Kumar; Ramesh Ummanni
      Abstract: Tissue microarray analysis confirmed higher dimethylarginine dimethylaminohydrolase-1 (DDAH1) expression in prostate cancer (PCa) compared to benign and normal prostate tissues. DDAH1 regulates nitric oxide (NO) production by degrading endogenous nitric oxide synthase (NOS) inhibitor, asymmetric dimethylarginine (ADMA). This study examined whether DDAH1 has any physiological role in PCa progression. Using overexpression of DDAH1 in PCa (PC3 and LNCaP) cell lines, we found that DDAH1 promotes cell proliferation, migration and invasion by lowering ADMA levels, as well as increasing NO production. VEGF, HIF-1α and iNOS were upregulated in DDAH1 expressing cells as result of elevated NO. DDAH1 increased secretion of pro-angiogenic signals bFGF and IL-8, into conditioned media. Treatment of DDAH1-positive PCa cells with NOS inhibitors (L-NAME and 1400 W) attenuated DDAH1 activity to promote cell growth. Xenografts derived from these cells grew significantly faster (> twofold) than those derived from control cells. Proliferation rate of cells stably expressing mutant DDAH1 was same as control cells unlike wild-type DDAH1-positive PCa cells. Xenograft tumors derived from mutant-positive cells did not differ from control tumors. VEGF, HIF-1α and iNOS expression did not differ in DDAH1 mutant-positive tumors compared to control tumors, but was upregulated in wild-type DDAH1 overexpressing tumors. Furthermore, CD31 immunostaining on xenograft tissues demonstrated that DDAH1 tumors had high endothelial content than mutant DDAH1 tumors. These data suggest that DDAH1 is an important mediator of PCa progression and NO/DDAH pathway needs to be considered in developing therapeutic strategies targeted at PCa.
      PubDate: 2017-11-17
      DOI: 10.1007/s10456-017-9587-0
  • Noninvasive induction of angiogenesis in tissues by external suction:
           sequential optimization for use in reconstructive surgery
    • Authors: G. Giatsidis; L. Cheng; A. Haddad; K. Ji; J. Succar; L. Lancerotto; J. Lujan-Hernandez; P. Fiorina; H. Matsumine; D. P. Orgill
      Abstract: In reconstructive surgery, tissues are routinely transferred to repair a defect caused by trauma, cancer, chronic diseases, or congenital malformations; surgical transfer intrinsically impairs metabolic supply to tissues placing a risk of ischemia-related complications such as necrosis, impaired healing, or infection. Pre-surgical induction of angiogenesis in tissues (preconditioning) can limit postsurgical ischemic complications and improve outcomes, but very few preconditioning strategies have successfully been translated to clinical practice due to the invasiveness of most proposed approaches, their suboptimal effects, and their challenging regulatory approval. We optimized a method that adopts noninvasive external suction to precondition tissues through the induction of hypoxia-mediated angiogenesis. Using a sequential approach in a rodent model, we determined the parameters of application (frequency, suction levels, duration, and interfaces) that fine-tune the balance of enhanced angiogenesis, attenuation of hypoxic tissue damage, and length of treatment. The optimized repeated short-intermittent applications of intermediate suction induced a 1.7-fold increase in tissue vascular density after only 5 days of treatment (p < 0.05); foam interfaces showed the same effectiveness and caused less complications. In a second separate experiment, our model showed that the optimized technique significantly improves survival of transferred tissues. Here we demonstrate that noninvasive external suction can successfully, safely, and promptly enhance vascularity of soft tissues: these translational principles can help design effective preconditioning strategies, transform best clinical practice in surgery, and improve patient outcomes.
      PubDate: 2017-11-17
      DOI: 10.1007/s10456-017-9586-1
  • Executive summary of the 12th HHT international scientific conference
    • Authors: Jillian W. Andrejecsk; Anna E. Hosman; Luisa M. Botella; Claire L. Shovlin; Helen M. Arthur; Sophie Dupuis-Girod; Elisabetta Buscarini; Christopher C. W. Hughes; Franck Lebrin; Christine L. Mummery; Marco C. Post; Johannes J. Mager
      Abstract: Hereditary hemorrhagic telangiectasia is an autosomal dominant trait affecting approximately 1 in 5000 people. A pathogenic DNA sequence variant in the ENG, ACVRL1 or SMAD4 genes, can be found in the majority of patients. The 12th International Scientific HHT Conference was held on June 8–11, 2017 in Dubrovnik, Croatia to present and discuss the latest scientific achievements, and was attended by over 200 scientific and clinical researchers. In total 174 abstracts were accepted of which 58 were selected for oral presentations. This article covers the basic science and clinical talks, and discussions from three theme-based workshops. We focus on significant emergent themes and unanswered questions. Understanding these topics and answering these questions will help to define the future of HHT research and therapeutics, and ultimately bring us closer to a cure.
      PubDate: 2017-11-16
      DOI: 10.1007/s10456-017-9585-2
  • Mechanisms of angiogenesis in microbe-regulated inflammatory and
           neoplastic conditions
    • Authors: Sanaullah Sajib; Fatema Tuz Zahra; Michail S. Lionakis; Nadezhda A. German; Constantinos M. Mikelis
      Abstract: Commensal microbiota inhabit all the mucosal surfaces of the human body. It plays significant roles during homeostatic conditions, and perturbations in numbers and/or products are associated with several pathological disorders. Angiogenesis, the process of new vessel formation, promotes embryonic development and critically modulates several biological processes during adulthood. Indeed, deregulated angiogenesis can induce or augment several pathological conditions. Accumulating evidence has implicated the angiogenic process in various microbiota-associated human diseases. Herein, we critically review diseases that are regulated by microbiota and are affected by angiogenesis, aiming to provide a broad understanding of how angiogenesis is involved and how microbiota regulate angiogenesis in microbiota-associated human conditions.
      PubDate: 2017-11-06
      DOI: 10.1007/s10456-017-9583-4
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Heriot-Watt University
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