Study of destruction effect of blood vessels after photodynamic therapy in a model of chorioallantoic membrane

2019 ◽  
Author(s):  
Gabriela Arthuzo ◽  
Vanderlei S. Bagnato ◽  
Hilde H. Buzzá
Keyword(s):  
Photodynamic Therapy ◽  
Blood Vessels ◽  
Chorioallantoic Membrane

scholarly journals Sustainable Development of Chitosan/Calotropis procera-Based Hydrogels to Stimulate Formation of Granulation Tissue and Angiogenesis in Wound Healing Applications

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3284
Author(s):  
Muhammad Zahid ◽  
Maria Lodhi ◽  
Zulfiqar Ahmad Rehan ◽  
Hamna Tayyab ◽  
Talha Javed ◽  
...  
Keyword(s):  
Wound Healing ◽  
Blood Vessels ◽  
Granulation Tissue ◽  
Chorioallantoic Membrane ◽  
Calotropis Procera ◽  
Connective Tissues ◽  
Blood Capillaries ◽  
Chick Chorioallantoic Membrane ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle

The formation of new scaffolds to enhance healing magnitude is necessarily required in biomedical applications. Granulation tissue formation is a crucial stage of wound healing in which granulation tissue grows on the surface of a wound by the formation of connective tissue and blood vessels. In the present study, porous hydrogels were synthesized using chitosan incorporating latex of the Calotropis procera plant by using a freeze–thaw cycle to stimulate the formation of granulation tissue and angiogenesis in wound healing applications. Structural analysis through Fourier transform infrared (FTIR) spectroscopy confirmed the interaction between chitosan and Calotropis procera. Latex extract containing hydrogel showed slightly higher absorption than the control during water absorption analysis. Thermogravimetric analysis showed high thermal stability of the 60:40 combination of chitosan (CS) and Calotropis procera as compared to all other treatments and controls. A fabricated scaffold application on a chick chorioallantoic membrane (CAM) showed that all hydrogels containing latex extract resulted in a significant formation of blood vessels and regeneration of cells. Overall, the formation of connective tissues and blood capillaries and healing magnitude decreased in ascending order of concentration of extract.

scholarly journals Photodynamic therapy of subfoveal choroidal neovascularization

2007 ◽  
Vol 135 (11-12) ◽  
pp. 629-634
Author(s):  
Ana Georgijevic ◽  
Zoran Tomic
Keyword(s):  
Visual Acuity ◽  
Photodynamic Therapy ◽  
Blood Vessels ◽  
Choroidal Neovascularization ◽  
Retinal Pigment ◽  
Photochemical Reactions ◽  
Pathologic Myopia ◽  
Target Tissue ◽  
Choroidal Hemangioma

Introduction Photodynamic therapy (PDT) is a method of treatment of choroidal neovascularization (CNV) with a diode laser used after intravenously administered verteporfin. Verteporfin is a light-activated drug initiating photochemical reactions in the target tissue. This leads to the selective occlusion of blood vessels in the CNV with no damage of photoreceptors, retinal pigment epithelium and retinal blood vessels. Objective To show the results of the treatment of predominantly classic subfoveal CNV with PDT with verteporfin used for the first time in our country. Method From 2003 to 2005, we treated 15 eyes in 15 patients using PDT and verteporfin, because of predominantly classic subfoveal CNV. If macular oedema was present as proved by fluorescein angiography, triamcinolone was administered intravitreally after PDT. Average follow-up period was 7 months (3 months to 2 years). Study design: retrospective, noncomparative, consecutive case series. Results Two thirds of patients had CNV due to AMD, while in others it was caused by pathologic myopia, chorioretinitis, angioid streaks, choroidal hemangioma, except for one patient who had idiopathic CNV. Visual acuity was stabile in 60% (9/15) of patients, of whom in 60% (6/10) of patients with AMD, as well as in patients with pathologic myopia, idiopathic CNV and choroidal hemangioma. Retreatment with PDT was indicated in 40% (6/15) and in 50% (5/10) of patients with AMD, mostly 4-6 months after first PDT, but was done only in one patient (economic reasons). In two patients with AMD, triamcinolone was administered intravitreally for 2-4 months, which resulted in the stabilization of visual acuity. Conclusion Visual acuity was stabile in 60% of all treated patients with predominantly classic subfoveal CNV after only one application of PDT with verteporfin during the average follow-up of 7 months (3 months to 2 years). Retreatment was indicated in 40% of the treated patients, and in 50% of patients with AMD. As confirmed, intravitreal administration of triamcinolone after PDT could stabilize visual acuity. Side effects were not noticed.

scholarly journals An antagonist of integrin alpha v beta 3 prevents maturation of blood vessels during embryonic neovascularization

1995 ◽  
Vol 108 (7) ◽  
pp. 2655-2661 ◽  
Author(s):  
C.J. Drake ◽  
D.A. Cheresh ◽  
C.D. Little
Keyword(s):  
Experimental Data ◽  
Monoclonal Antibody ◽  
Blood Vessels ◽  
Chorioallantoic Membrane ◽  
Normal Pattern ◽  
Basal Surface ◽  
Lumen Formation ◽  
Vessel Development ◽  
Alpha V Beta 3 ◽  
Chicken Chorioallantoic Membrane

Experimental data in this study demonstrate that integrin alpha v beta 3 is fundamentally involved in the maturation of blood vessels during embryonic neovascularization (vasculogenesis). Integrin alpha v beta 3 was specifically expressed on the surface of angioblasts during vessel development in quail embryos and vitronectin, a ligand for alpha v beta 3, localized to the basal surface of these cells. More importantly, microinjection of the anti-alpha v beta 3 monoclonal antibody, LM609, disrupted the normal pattern of vascular development. After exposure to LM609 the angioblasts in experimental embryos appeared as clusters of rounded cells lacking normal cellular protrusions. This led to disruption of lumen formation and abnormal vessel patterning. These findings demonstrate that during vasculogenesis ligation of integrin alpha v beta 3 on the surface of primordial endothelial cells is critical for the differentiation and maturation of blood vessels. Similar studies on chicken chorioallantoic membrane showed that LM609 blocks angiogenesis. Together the two studies suggest that integrin alpha v beta 3 plays a role in neovascularization of tissues.

scholarly journals Vascular Effects of Photodynamic Therapy with Curcumin in a Chorioallantoic Membrane Model

2019 ◽  
Vol 20 (5) ◽  
pp. 1084 ◽  
Author(s):  
Hilde Buzzá ◽  
Lucas Fialho de Freitas ◽  
Lilian Moriyama ◽  
Ramon Teixeira Rosa ◽  
Vanderlei Bagnato ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Molecular Oxygen ◽  
Chorioallantoic Membrane ◽  
Topical Administration ◽  
Inhibitory Effect ◽  
Vascular Effects ◽  
Vascular Effect ◽  
Chick Chorioallantoic Membrane ◽  
Anti Oxidant ◽  
Total Fluence

Photodynamic Therapy (PDT) is a treatment that requires light, a photosensitizing agent, and molecular oxygen. The photosensitizer is activated by light and it interacts with the oxygen that is present in the cellular microenvironment. The molecular oxygen is transformed into singlet oxygen, which is highly reactive and responsible for the cell death. Therefore, PS is an important element for the therapy happens, including its concentration. Curcumin is a natural photosensitizer and it has demonstrated its anti-inflammatory and anti-oxidant effects that inhibit several signal transduction pathways. PDT vascular effects of curcumin at concentrations varying from 0.1 to 10 mM/cm2 and topical administration were investigated in a chick Chorioallantoic Membrane (CAM) model. The irradiation was performed at 450 nm, irradiance of 50 mW/cm2 during 10 min, delivering a total fluence of 30 J/cm2. The vascular effect was followed after the application of curcumin, with images being obtained each 30 min in the first 3 h, 12 h, and 24 h. Those images were qualitatively and quantitatively analyzed with a MatLAB®. Curcumin was expected to exhibit a vascular effect due to its angio-inhibitory effect. Using curcumin as photosensitizer, PDT induced a higher and faster vascular effect when compared to the use of this compound alone.

Chlorpyrifos and its metabolite modulates angiogenesis in the chorioallantoic membrane of chick embryo

2019 ◽  
Vol 31 (1) ◽  
Author(s):  
C. Swathi Priyadarshini ◽  
Thotakura Balaji ◽  
Jyothi Ashok Kumar ◽  
Manickam Subramanian ◽  
Indumathi Sundaramurthi ◽  
...  
Keyword(s):  
Chick Embryo ◽  
Blood Vessels ◽  
Insect Pests ◽  
Ex Vivo ◽  
Parent Compound ◽  
Chorioallantoic Membrane ◽  
Organophosphate Insecticide ◽  
Food And Feed ◽  
Major Route ◽  
Polymerase Chain

AbstractBackgroundChlorpyrifos (CPF) is an organophosphate insecticide, acaricide, and miticide used primarily to control foliage and soilborne insect pests on a variety of food and feed crops. Since trace amounts of these compounds are found in water and food products, they easily enter into the organ system unnoticed. In the same way, the compound or its metabolite gets transmitted from the parent to the embryo mainly through blood vessels. Since blood vessels form the major route of transport, it is pertinent to study the effect of these compounds during angiogenesis. The effect of CPF and 3,5,6-trichloro-2-pyridinol (TCPy) on the angiogenesis of chick embryo was evaluated in the chorioallantoic membrane (CAM) using an ex vivo model.MethodsNine-day-old incubated eggs where inoculated with various doses of CPF and TCPy. After 48 h of incubation, the CAM layers were retrieved and analyzed using angiogenesis software to obtain the density of blood vessels. Histomorphometric studies were performed to measure the thickness of vessel walls. The expression of VEGF, VEGFR2, and N-cadherin genes responsible for angiogenesis were analyzed.ResultsThe exposure to the parent compound CPF and its metabolite TCPy promoted angiogenesis in groups administered with lower concentration of the pesticide and its metabolite, whereas a decline in angiogenesis was observed at higher concentrations. These observations were made by analyzing the density, histomorphometry results, and semiquantitative reverse transcriptase polymerase chain reaction (RT-PCR) results. The density, thickness, and lumen size of blood vessels in the groups with low concentration of CPF and TCPy were 28.34, 9 μm, and 30 μm, respectively, whereas in the groups with higher CPF and TCPy concentrations, they were 12, 3 μm, and 9 μm, respectively.ConclusionsHence, CPF and its metabolites interfere with angiogenesis in the CAM of chick embryos. Because of their estrogen-mimicking ability, pesticides are the prime etiological suspects of increasing alteration in blood vessel formation. These results may be of help in future studies on the effect of CPF in embryonic growth, wound healing, diabetes, and tumors.

A novel link between angiogenesis and natural products: Anti-angiogenic effects of Opuntia dillenii

2014 ◽  
Vol 9 (3) ◽  
pp. 298-308
Author(s):  
Sohail Ejaz ◽  
Khaleeq Anwar ◽  
Robina Taj ◽  
Muhammad Ashraf
Keyword(s):  
Blood Vessels ◽  
Inflammatory Diseases ◽  
Chorioallantoic Membrane ◽  
Angular Spectrum ◽  
New Drugs ◽  
Angiogenic Potential ◽  
Pathological Angiogenesis ◽  
Histological Data ◽  
Computer Based ◽  
Opuntia Dillenii

AbstractAngiogenesis is the formation of new blood vessels from the existing blood vessels and is involved in both physiological and pathological events. Pathological angiogenesis provokes in several important diseases as in inflammatory diseases, ischemic conditions, diabetic neuropathy and cancer. The discovery of new drugs from phyto-chemicals has a long history and anti-angiogenic agents from plant sources provide a platform for the development of phyto-medicines to treat/control pathological angiogenesis. The current project was designed to determine the efficacy of different concentrations of aqueous extract from Opuntia dillenii (OD) on angiogenesis by employing chicken chorioallantoic membrane (CAM) assay. Computer based 3D image probing was utilized to quantify anti-angiogenic effects of OD extract. Extremely aggravated dose dependent anti-angiogenic response was recorded in all groups treated with OD extract with significant reduction (P<0.01) in total area, diameter of the primary, secondary, tertiary blood vessels and capillary plexuses. Analysis of 3D parameters of OD treated CAMs revealed deteriorated angular spectrum and reduction in the height of Abbott curves. In addition, histological data revealed thinning of ectodermal layer and damaged extracellular matrix. The results spotlight that OD extract possess considerable anti-angiogenic potential and further characterization/isolation of diverse phyto-chemicals would turn up with the discovery of novel phyto-agents to control/mitigate pathological angiogenesis.

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