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  Subjects -> MEDICAL SCIENCES (Total: 7439 journals)
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MEDICAL SCIENCES (1857 journals)                  1 2 3 4 5 6 7 8 | Last

Showing 1 - 200 of 3562 Journals sorted alphabetically
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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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African Health Sciences     Open Access   (Followers: 2)
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African Journal of Clinical and Experimental Microbiology     Open Access   (Followers: 1)
African Journal of Laboratory Medicine     Open Access   (Followers: 2)
African Journal of Medical and Health Sciences     Open Access   (Followers: 2)
African Journal of Trauma     Open Access  
Afrimedic Journal     Open Access   (Followers: 2)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
AIDS Research and Human Retroviruses     Hybrid Journal   (Followers: 8)
AJOB Primary Research     Partially Free   (Followers: 3)
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Aktuelle Ernährungsmedizin     Hybrid Journal   (Followers: 4)
Al-Azhar Assiut Medical Journal     Open Access  
Alexandria Journal of Medicine     Open Access   (Followers: 1)
Allgemeine Homöopathische Zeitung     Hybrid Journal   (Followers: 2)
Alpha Omegan     Full-text available via subscription  
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3)
American Journal of Biomedical Engineering     Open Access   (Followers: 12)
American Journal of Biomedical Research     Open Access   (Followers: 2)
American Journal of Biomedicine     Full-text available via subscription   (Followers: 7)
American Journal of Chinese Medicine, The     Hybrid Journal   (Followers: 4)
American Journal of Clinical Medicine Research     Open Access   (Followers: 6)
American Journal of Family Therapy     Hybrid Journal   (Followers: 11)
American Journal of Law & Medicine     Full-text available via subscription   (Followers: 10)
American Journal of Lifestyle Medicine     Hybrid Journal   (Followers: 5)
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American Journal of Medical Case Reports     Open Access   (Followers: 1)
American Journal of Medical Sciences and Medicine     Open Access   (Followers: 3)
American Journal of Medicine     Hybrid Journal   (Followers: 42)
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American Journal of Medicine Studies     Open Access  
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American Journal of the Medical Sciences     Hybrid Journal   (Followers: 12)
American Journal on Addictions     Hybrid Journal   (Followers: 7)
American medical news     Free   (Followers: 3)
American Medical Writers Association Journal     Full-text available via subscription   (Followers: 2)
Amyloid: The Journal of Protein Folding Disorders     Hybrid Journal   (Followers: 5)
Anales de la Facultad de Medicina     Open Access  
Anales de la Facultad de Medicina, Universidad de la República, Uruguay     Open Access  
Anales del Sistema Sanitario de Navarra     Open Access   (Followers: 1)
Analgesia & Resuscitation : Current Research     Hybrid Journal   (Followers: 4)
Anatomical Science International     Hybrid Journal   (Followers: 2)
Anatomical Sciences Education     Hybrid Journal   (Followers: 1)
Anatomy Research International     Open Access   (Followers: 2)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3)
Ankara Medical Journal     Open Access   (Followers: 2)
Annales de Pathologie     Full-text available via subscription  
Annales françaises d'Oto-rhino-laryngologie et de Pathologie Cervico-faciale     Full-text available via subscription   (Followers: 3)
Annals of African Medicine     Open Access   (Followers: 1)
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Annals of Ibadan Postgraduate Medicine     Open Access  
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Annals of Microbiology     Hybrid Journal   (Followers: 10)
Annals of Nigerian Medicine     Open Access   (Followers: 1)
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Annals of the New York Academy of Sciences     Hybrid Journal   (Followers: 5)
Annals of The Royal College of Surgeons of England     Full-text available via subscription   (Followers: 3)
Annual Reports in Medicinal Chemistry     Full-text available via subscription   (Followers: 7)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 4)
Annual Review of Medicine     Full-text available via subscription   (Followers: 17)
Anthropological Review     Open Access   (Followers: 22)
Anthropologie et santé     Open Access   (Followers: 5)
Antibiotics     Open Access   (Followers: 9)
Antibodies     Open Access   (Followers: 2)
Antibody Technology Journal     Open Access   (Followers: 1)
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)
Applied Clinical Research, Clinical Trials and Regulatory Affairs     Hybrid Journal  
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 Medical Laboratory Sciences     Open Access   (Followers: 1)
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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  
Arquivos de Medicina     Open Access  
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: 11)
Arterial Hypertension     Open Access   (Followers: 1)
Artificial Intelligence in Medicine     Hybrid Journal   (Followers: 12)
Artificial Organs     Hybrid Journal   (Followers: 1)
Asia Pacific Family Medicine     Open Access   (Followers: 1)
Asia Pacific Journal of Clinical Nutrition     Full-text available via subscription   (Followers: 10)
Asia Pacific Journal of Clinical Trials : Nervous System Diseases     Open Access  
Asian Bioethics Review     Full-text available via subscription   (Followers: 3)
Asian Journal of Cell Biology     Open Access   (Followers: 5)
Asian Journal of Health     Open Access   (Followers: 3)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 3)
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: 3)
Asian Journal of Transfusion Science     Open Access   (Followers: 1)
Asian Medicine     Hybrid Journal   (Followers: 5)
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: 1)
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: 3)
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)
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BC Medical Journal     Free  
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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  [2352 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
           atherosclerosis
    • 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)
       
  • Extracellular vesicle-carried Jagged-1 inhibits HUVEC sprouting in a 3D
           microenvironment
    • Authors: Evan Tan; Harry H. Asada; Ruowen Ge
      Abstract: NOTCH signalling is an evolutionarily conserved juxtacrine signalling pathway that is essential in development. Jagged1 (JAG1) and Delta-like ligand 4 (DLL4) are transmembrane NOTCH ligands that regulate angiogenesis by controlling endothelial cell (EC) differentiation, vascular development and maturation. In addition, DLL4 could bypass its canonical cell–cell contact-dependent signalling to influence NOTCH signalling and angiogenesis at a distance when it is packaged into extracellular vesicles (EVs). However, it is not clear whether JAG1 could also be packaged into EVs to influence NOTCH signalling and angiogenesis. In this work, we demonstrate that JAG1 is also packaged into EVs. We present evidence that JAG1-EVs inhibit NOTCH signalling and regulate EC behaviour and function. JAG1-EVs inhibited VEGF-induced HUVEC proliferation and migration in 2D culture condition and suppressed sprouting in a 3D microfluidic microenvironment. JAG1-EV treatment of HUVECs leads to a reduction of Notch1 intracellular domain (N1-ICD), and the proteasome and the intracellular domain of JAG1 (JAG1-ICD) are both required for this reduction to occur. These findings reveal a novel mechanism of JAG1 function in NOTCH signalling and ECs through EVs.
      PubDate: 2018-03-14
      DOI: 10.1007/s10456-018-9609-6
       
  • Platelet function is disturbed by the angiogenesis inhibitors sunitinib
           and sorafenib, but unaffected by bevacizumab
    • Authors: Maudy Walraven; Marjolein Y. V. Homs; Astrid A. M. van der Veldt; Henk Dekker; Jose Koldenhof; Richard Honeywell; Arjan Barendrecht; Silvie A. E. Sebastian; Naomi Parr; Arnold C. Koekman; Emile E. Voest; Mark Roest; Suzanne J. A. Korporaal; Henk M. W. Verheul
      Abstract: Introduction At the clinical introduction of antiangiogenic agents as anticancer agents, no major toxicities were expected as merely just endothelial cells (ECs) in tumors would be affected. However, several (serious) toxicities became apparent, of which underlying mechanisms are largely unknown. We investigated to what extent sunitinib (multitargeted antiangiogenic tyrosine kinase inhibitor (TKI)), sorafenib (TKI) and bevacizumab [specific antibody against vascular endothelial growth factor (VEGF)] may impair platelet function, which might explain treatment-related bleedings. Materials and methods In vitro, the influence of sunitinib, sorafenib, and bevacizumab on platelet aggregation, P-selectin expression and fibrinogen binding, platelet–EC interaction, and tyrosine phosphorylation of c-Src was studied by optical aggregation, flow cytometry, real-time perfusion, and western blotting. Ex vivo, platelet aggregation was analyzed in 25 patients upon sunitinib or bevacizumab treatment. Concentrations of sunitinib, VEGF, and platelet and EC activation markers were measured by LC–MS/MS and ELISA. Results In vitro, sunitinib and sorafenib significantly inhibited platelet aggregation (20 μM sunitinib: 71.3%, p < 0.001; 25 μM sorafenib: 55.8%, p = 0.042). Sorafenib and sunitinib significantly inhibited P-selectin expression on platelets. Exposure to both TKIs resulted in a reduced tyrosine phosphorylation of c-Src. Ex vivo, within 24 h sunitinib impaired platelet aggregation (83.0%, p = 0.001, N = 8). Plasma concentrations of sunitinib, VEGF, and platelet/EC activation markers were not correlated with disturbed aggregation. In contrast, bevacizumab only significantly impaired platelet aggregation in vitro at high concentrations, but not ex vivo. Conclusion Sunitinib significantly inhibits platelet aggregation in patients already after 24 h of first administration, whereas bevacizumab had no effect on aggregation. These findings may explain the clinically observed bleedings during treatment with antiangiogenic TKIs.
      PubDate: 2018-03-12
      DOI: 10.1007/s10456-018-9598-5
       
  • Peripheral post-ischemic vascular repair is impaired in a murine model of
           Alzheimer’s disease
    • Authors: Tatyana Merkulova-Rainon; Chris S. Mantsounga; Dong Broquères-You; Cristina Pinto; José Vilar; Diana Cifuentes; Philippe Bonnin; Nathalie Kubis; Daniel Henrion; Jean-Sébastien Silvestre; Bernard I. Lévy
      Abstract: The pathophysiology of sporadic Alzheimer’s disease (AD) remains uncertain. Along with brain amyloid-β (Aβ) deposits and neurofibrillary tangles, cerebrovascular dysfunction is increasingly recognized as fundamental to the pathogenesis of AD. Using an experimental model of limb ischemia in transgenic APPPS1 mice, a model of AD (AD mice), we showed that microvascular impairment also extends to the peripheral vasculature in AD. At D70 following femoral ligation, we evidenced a significant decrease in cutaneous blood flow (− 29%, P < 0.001), collateral recruitment (− 24%, P < 0.001), capillary density (− 22%; P < 0.01) and arteriole density (− 28%; P < 0.05) in hind limbs of AD mice compared to control WT littermates. The reactivity of large arteries was not affected in AD mice, as confirmed by unaltered size, and vasoactive responses to pharmacological stimuli of the femoral artery. We identified blood as the only source of Aβ in the hind limb; thus, circulating Aβ is likely responsible for the impairment of peripheral vasculature repair mechanisms. The levels of the majority of pro-angiogenic mediators were not significantly modified in AD mice compared to WT mice, except for TGF-β1 and PlGF-2, both of which are involved in vessel stabilization and decreased in AD mice (P = 0.025 and 0.019, respectively). Importantly, endothelin-1 levels were significantly increased, while those of nitric oxide were decreased in the hind limb of AD mice (P < 0.05). Our results suggest that vascular dysfunction is a systemic disorder in AD mice. Assessment of peripheral vascular function may therefore provide additional tools for early diagnosis and management of AD.
      PubDate: 2018-03-07
      DOI: 10.1007/s10456-018-9608-7
       
  • Characterization of a drug-targetable allosteric site regulating vascular
           endothelial growth factor signaling
    • Authors: Katherine M. Thieltges; Dragana Avramovic; Chayne L. Piscitelli; Sandra Markovic-Mueller; Hans Kaspar Binz; Kurt Ballmer-Hofer
      Abstract: Vascular endothelial growth factors (VEGFs) regulate blood and lymph vessel development upon activation of three receptor tyrosine kinases (VEGFRs). The extracellular domain of VEGFRs consists of seven Ig-homology domains, of which D2–3 form the ligand-binding site, while the membrane proximal domains D4–7 are involved in homotypic interactions in ligand-bound receptor dimers. Based on low-resolution structures, we identified allosteric sites in D4–5 and D7 of vascular endothelial growth factor receptor 2 (VEGFR-2) accomplishing regulatory functions. Allosteric inhibition of VEGFR-2 signaling represents an attractive option for the treatment of neovascular diseases. We showed earlier that DARPin® binders to domains D4 or D7 are potent VEGFR-2 inhibitors. Here we investigated in detail the allosteric inhibition mechanism of the domain D4 binding inhibitor D4b. The 2.38 Å crystal structure of D4b in complex with VEGFR-2 D4–5, the first high-resolution structure of this VEGFR-2 segment, indicates steric hindrance by D4b as the mechanism of inhibition of receptor activation. At the cellular level, D4b triggered quantitative internalization of VEGFR-2 in the absence of ligand and thus clearance of VEGFR-2 from the surface of endothelial cells. The allosteric VEGFR-2 inhibition was sufficiently strong to efficiently inhibit the growth of human endothelial cells at suboptimal dose in a mouse xenograft model in vivo, underlining the therapeutic potential of the approach.
      PubDate: 2018-03-03
      DOI: 10.1007/s10456-018-9606-9
       
  • Different angioregulatory activity of monovalent galectin-9 isoforms
    • Authors: Ed Aanhane; Iris A. Schulkens; Roy Heusschen; Kitty Castricum; Hakon Leffler; Arjan W. Griffioen; Victor L. Thijssen
      Abstract: Galectin-9 consists of two peptide-linked carbohydrate recognition domains (CRDs), but alternative splicing and proteolytic processing can give rise to multiple galectin-9 isoforms. Some of these consist of a single CRD and can exert different functions in cell biology. Here, we explored the role of these galectin-9 isoforms in endothelial cell function and angiogenesis. For this, we compared the effects of the two separate CRDs (Gal-9N and Gal-9C) with the tandem repeat galectin-9M on endothelial cell proliferation, migration, sprouting and tube formation in vitro as well as on angiogenesis in vivo using the chicken chorioallantoic membrane (CAM) assay. Galectin-9 isoforms significantly affected proliferation in quiescent endothelial cells and migration in activated endothelial cells. Interestingly, both monovalent gal-9 CRDs displayed opposite effects compared to gal-9M on proliferation and migration. Sprouting was significantly inhibited by gal-9C, while all isoforms appeared to stimulate tube formation. Angiogenesis in vivo was hampered by all three isoforms with predominant effects on vessel length. In general, the isoforms induced only subtle concentration-dependent effects in vitro as well as in vivo. Collectively, the effects of different galectin-9 isoforms in endothelial cell biology depend on the cellular activation status. While opposing effects can be observed on a cellular level in vitro, all galectin-9 isoforms hamper angiogenesis in vivo. This warrants further investigation of the regulatory mechanisms that underlie the diverging roles of galectin-9 isoforms in endothelial cell biology since this could provide therapeutic opportunities.
      PubDate: 2018-03-02
      DOI: 10.1007/s10456-018-9607-8
       
  • Serum/glucocorticoid-regulated kinase 1 as a novel transcriptional target
           of bone morphogenetic protein-ALK1 receptor signaling in vascular
           endothelial cells
    • Authors: Mutsumi Araki; Takashi Hisamitsu; Yumi Kinugasa-Katayama; Toru Tanaka; Yukihiro Harada; Shu Nakao; Sanshiro Hanada; Shuhei Ishii; Masahide Fujita; Teruhisa Kawamura; Yoshihiko Saito; Koichi Nishiyama; Yusuke Watanabe; Osamu Nakagawa
      Abstract: Bone morphogenetic protein 9 (BMP9)/BMP10-ALK1 receptor signaling is essential for endothelial differentiation and vascular morphogenesis. Mutations in ALK1/ACVRL1 and other signal-related genes are implicated in human vascular diseases, and the Alk1/Acvrl1 deletion in mice causes severe impairment of vascular formation and embryonic lethality. In the microarray screen to search for novel downstream genes of ALK1 signaling, we found that the mRNA and protein expression of serum/glucocorticoid-regulated kinase 1 (SGK1) was rapidly up-regulated by the BMP9 stimulation of cultured human endothelial cells. The increase in SGK1 mRNA was completely blocked by the transcriptional inhibitor actinomycin D and significantly suppressed by the siRNA treatment against the co-SMAD transcription factor SMAD4. Upon the BMP9 treatment of endothelial cells, phosphorylated SMAD1/5/9 bound to a consensus site upstream of the SGK1 gene, which was necessary for BMP9-dependent increment of the luciferase reporter activity driven by the SGK1 proximal enhancer. The Sgk1 mRNA expression in mouse embryos was enriched in vascular endothelial cells at embryonic day 9.0–9.5, at which Sgk1 null mice showed embryonic lethality due to abnormal vascular formation, and its mRNA as well as protein expression was clearly reduced in Alk1/Acvrl1 null embryos. These results indicate that SGK1 is a novel target gene of BMP9/BMP10-ALK1 signaling in endothelial cells and further suggest a possibility that down-regulation of the Sgk1 expression may be involved in the mechanisms of vascular defects by the ALK1 signaling deficiency.
      PubDate: 2018-02-24
      DOI: 10.1007/s10456-018-9605-x
       
  • Vascular deficiency of Smad4 causes arteriovenous malformations: a mouse
           model of Hereditary Hemorrhagic Telangiectasia
    • Authors: Angela M. Crist; Amanda R. Lee; Nehal R. Patel; Dawn E. Westhoff; Stryder M. Meadows
      Abstract: Hereditary hemorrhagic telangiectasia (HHT) is an autosomal dominant vascular disorder that leads to abnormal connections between arteries and veins termed arteriovenous malformations (AVM). Mutations in TGFβ pathway members ALK1, ENG and SMAD4 lead to HHT. However, a Smad4 mouse model of HHT does not currently exist. We aimed to create and characterize a Smad4 endothelial cell (EC)-specific, inducible knockout mouse (Smad4f/f;Cdh5-CreERT2) that could be used to study AVM development in HHT. We found that postnatal ablation of Smad4 caused various vascular defects, including the formation of distinct AVMs in the neonate retina. Our analyses demonstrated that increased EC proliferation and size, altered mural cell coverage and distorted artery–vein gene expression are associated with Smad4 deficiency in the vasculature. Furthermore, we show that depletion of Smad4 leads to decreased Vegfr2 expression, and concurrent loss of endothelial Smad4 and Vegfr2 in vivo leads to AVM enlargement. Our work provides a new model in which to study HHT-associated phenotypes and links the TGFβ and VEGF signaling pathways in AVM pathogenesis.
      PubDate: 2018-02-19
      DOI: 10.1007/s10456-018-9602-0
       
  • 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
       
  • 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
       
  • 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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