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https://www.readbyqxmd.com/read/28826357/3d-printing-and-angiogenesis-tailored-agarose-type-i-collagen-blends-comprise-3d-printability-and-angiogenesis-potential-for-tissue-engineered-substitutes
#1
Franziska Kreimendahl, Marius Köpf, Anja Lena Thiebes, Daniela F Duarte Campos, Andreas Blaeser, Thomas Schmitz-Rode, Christian Apel, Stefan Jockenhoevel, Horst Fischer
3D bioprinting is a promising technology for manufacturing cell-laden tissue engineered constructs. Larger tissue substitutes, however, require a vascularized network to ensure nutrition supply. Therefore, tailored bioinks combining 3D printability and cell-induced vascularization are needed. We hypothesize that tailored hydrogel blends made of agarose-type I collagen and agarose-fibrinogen are 3D printable and will allow the formation of capillary-like structures by human umbilical vein endothelial cells and human dermal fibroblasts...
August 21, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28807635/sustained-benefits-of-ranibizumab-with-or-without-laser-in-branch-retinal-vein-occlusion-24-month-results-of-the-brighter-study
#2
Ramin Tadayoni, Sebastian M Waldstein, Francesco Boscia, Heinrich Gerding, Margarita Gekkieva, Elizabeth Barnes, Ayan Das Gupta, Andreas Wenzel, Ian Pearce
PURPOSE: To evaluate the long-term (24-month) efficacy and safety of ranibizumab 0.5 mg administered pro re nata (PRN) with or without laser using an individualized visual acuity (VA) stabilization criteria in patients with visual impairment due to macular edema secondary to branch retinal vein occlusion (BRVO). DESIGN: Phase IIIb, open-label, randomized, active-controlled, 3-arm, multicenter study. PARTICIPANTS: A total of 455 patients. METHODS: Patients were randomized (2:2:1) to ranibizumab 0...
August 11, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28795951/gelma-collagen-blends-enable-drop-on-demand-3d-printablility-and-promote-angiogenesis
#3
Henrike Stratesteffen, Marius Johannes Köpf, Franziska Kreimendahl, Andreas Blaeser, Stefan Jockenhoevel, Horst Fischer
Effective vascularization is crucial for three dimensional (3D) printed hydrogel-cell constructs to efficiently supply cells with oxygen and nutrients. Till date, several hydrogel blends have been developed that allow the in vitro formation of a capillary-like network within the gels but comparatively less effort has been made to improve the suitability of the materials for a 3D bioprinting process. Therefore, we hypothesize that tailored hydrogel blends of photo-crosslinkable gelatin and type I collagen exhibit favorable 3D drop-on-demand printing characteristics in terms of rheological and mechanical properties and that further capillary-like network formation can be induced by co-culturing human umbilical vein endothelial cells (HUVEC) and human mesenchymal stem cells (hMSC) within the proposed blends...
August 10, 2017: Biofabrication
https://www.readbyqxmd.com/read/28790803/the-outcome-of-low-frequency-intravitreal-bevacizumab-therapy-for-macular-edema-in-retinal-vein-occlusions
#4
Biljana Ivanovska Adjievska, Salih Boskurt, Nikola Orovcanec, Vesna Dimovska-Jordanova
AIM: We aimed to evaluate the 1-year efficacy and safety of low-frequency intravitreal bevacizumab in the treatment of macular edema due to retinal vein occlusions (RVOs). METHODS: The study comprised an interventional prospective study of patients with macular edema due to central retinal vein occlusion (CRVO) or branch retinal vein occlusion, followed for 12 months. Treatment-naïve patients with reduced best-corrected visual acuity (BCVA) and central macular thickness (CMT) of at least 250 μm received intravitreal injection of bevacizumab...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28777009/importance-of-mitochondrial-calcium-uniporter-in-high-glucose-induced-endothelial-cell-dysfunction
#5
Wei Chen, Jie Yang, Shuhua Chen, Hong Xiang, Hengdao Liu, Dan Lin, Shaoli Zhao, Hui Peng, Pan Chen, Alex F Chen, Hongwei Lu
OBJECTIVE: Mitochondrial Ca(2+) overload is implicated in hyperglycaemia-induced endothelial cell dysfunction, but the key molecular events responsible remain unclear. We examined the involvement of mitochondrial calcium uniporter, which mediates mitochondrial Ca(2+) uptake, in endothelial cell dysfunction resulting from high-glucose treatment. METHODS: Human umbilical vein endothelial cells were exposed to various glucose concentrations and to high glucose (30 mM) following mitochondrial calcium uniporter inhibition or activation with ruthenium red and spermine, respectively...
August 1, 2017: Diabetes & Vascular Disease Research
https://www.readbyqxmd.com/read/28775075/first-selective-12-lox-inhibitor-ml355-impairs-thrombus-formation-and-vessel-occlusion-in-vivo-with-minimal-effects-on-hemostasis
#6
Reheman Adili, Benjamin E Tourdot, Katherine Mast, Jennifer Yeung, John Cody Freedman, Abigail Green, Diane K Luci, Ajit Jadhav, Anton Simeonov, David J Maloney, Theodore R Holman, Michael Holinstat
OBJECTIVE: Adequate platelet reactivity is required for maintaining hemostasis. However, excessive platelet reactivity can also lead to the formation of occlusive thrombi. Platelet 12(S)-lipoxygenase (12-LOX), an oxygenase highly expressed in the platelet, has been demonstrated to regulate platelet function and thrombosis ex vivo, supporting a key role for 12-LOX in the regulation of in vivo thrombosis. However, the ability to pharmacologically target 12-LOX in vivo has not been established to date...
August 3, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28767808/preliminary-results-of-severe-venous-insufficiency-treatment-with-thermal-ablation-of-the-great-saphenous-vein-by-endovascular-technique-with-laser-diode-980nm-developed-in-brazil-associated-with-sclerotherapy-with-polidocanol
#7
Matheus Bertanha, Marcone Lima Sobreira, Paula Angelelli Bueno Camargo, Rafael Elias Farres Pimenta, Jamil Victor Oliveira Mariúba, Regina Moura, Vanderlei Salvador Bagnato, Winston Bonetti Yoshida
The endovenous laser ablation (EVLA) of the insufficient saphenous vein has similar results to open conventional surgery, but less morbidity. The echo-guided polidocanol foam sclerotherapy technique has been used for the same purpose. The combined techniques may play a role for more severe diseases, such as those with varicose ulcers. An EVLA device (called VELAS) has been developed in the Optics and Photonics Research Center of USP-São Carlos in agreement with FMB-UNESP. In this study, we present the preliminary results of the VELAS device (MMO 980nm diode) in patients with chronic venous ulcer, associated with echo-guided polidocanol foam sclerotherapy for the treatment of varicosities...
May 2017: Revista do Colégio Brasileiro de Cirurgiões
https://www.readbyqxmd.com/read/28763561/establishment-and-characterization-of-an-acute-model-of-ocular-hypertension-by-laser-induced-occlusion-of-episcleral-veins
#8
Liwei Zhang, Guangyu Li, Meng Shi, Hsin-Hua Liu, Shaokui Ge, Yvonne Ou, John G Flanagan, Lu Chen
Purpose: This study was designed to develop and characterize a laser-induced model of acute intraocular hypertension that permits the study of the anterior segment of the eye. Methods: CD1 mice aged 5 and 8 weeks were examined for elevation of IOP induced by laser photocoagulation. We compared between occlusion of episcleral veins alone and when combined with 270° limbal vessel occlusion. Anterior chamber angle, corneal thickness, and retinal nerve fiber layer (RNFL) thickness were evaluated by anterior- and posterior-segment optical coherence tomography (OCT)...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28750436/-retinal-vascular-occlusion-modern-therapeutic-approaches
#9
Moritz Pettenkofer, Nicolas Feltgen, Nikolaus Feucht, Chris P Lohmann, Mathias M Maier
Retinal artery occlusion (RAO) should be evaluated as an emergency and can be seen as an ocular analogue to the cerebral apoplex. Both have the same arteriosclerotic risk factors, which are also responsible for cardiac, circulatory and cerebrovascular diseases. That is why an intensive interdisciplinary clarification is necessary to recognize possible comorbidities in time and, if necessary, to treat them. The current therapeutic possibilities of an acute RAO are very limited in their efficiency regarding visual improvement...
July 27, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28750413/in-vivo-imaging-of-retinal-hypoxia-using-hypox-4-dependent-fluorescence-in-a-mouse-model-of-laser-induced-retinal-vein-occlusion-rvo
#10
Md Imam Uddin, Ashwath Jayagopal, Gary W McCollum, Rong Yang, John S Penn
Purpose: To demonstrate the utility of a novel in vivo molecular imaging probe, HYPOX-4, to detect and image retinal hypoxia in real time, in a mouse model of retinal vein occlusion (RVO). Methods: Retinal vein occlusion was achieved in adult mice by photodynamic retinal vein thrombosis (PRVT). One or two major retinal vein(s) was/were occluded in close proximity to the optic nerve head (ONH). In vivo imaging of retinal hypoxia was performed using, HYPOX-4, an imaging probe developed by our laboratory...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28745659/-current-approach-and-the-role-of-laser-photocoagulation-in-the-treatment-of-retinal-vein-occlusions
#11
S V Sdobnikova, K A Mirzabekova, V K Surguch
Despite the emergence of new approaches in the treatment of retinal vein thrombosis and post-thrombotic complications, namely, intravitreal pharmacotherapy and surgical treatment, laser photocoagulation continues to play a significant role in the management of patients with this pathology. Although the method of laser photocoagulation has been used for quite a long time, different views exist on its indications and execution in specific clinical situations. At that, not all opinions regarding the use of laser photocoagulation in thrombosis are based on convincing clinical studies...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28739100/movement-of-retinal-vessels-toward-the-optic-nerve-head-after-increasing-intraocular-pressure-in-monkey-eyes-with-experimental-glaucoma
#12
Atsumi Kuroda, Nobuko Enomoto, Kyoko Ishida, Masamitsu Shimazawa, Tetsuro Noguchi, Naoto Horai, Hirotaka Onoe, Hideaki Hara, Goji Tomita
A shift or displacement of the retinal blood vessels (RBVs) with neuroretinal rim thinning indicates the progression of glaucomatous optic neuropathy. In chronic open angle glaucoma, individuals with RBV positional shifts exhibit more rapid visual field loss than those without RBV shifts. The retinal vessels reportedly move onto the optic nerve head (ONH) in response to glaucoma damage, suggesting that RBVs are pulled toward the ONH in response to increased cupping. Whether this phenomenon only applies to RVBs located in the vicinity or inside the ONH or, more generally, to RBVs also located far from the ONH, however, is unclear...
September 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28723304/the-quest-for-durable-lesions-in-catheter-ablation-of-atrial-fibrillation-technological-advances-in-radiofrequency-catheters-and-balloon-devices
#13
Tilman Maurer, Karl-Heinz Kuck
Atrial fibrillation is the most common cardiac arrhythmia and represents a growing clinical, social and economic challenge. Catheter ablation for symptomatic atrial fibrillation has evolved from an experimental procedure into a widespread therapy and offers a safe and effective treatment option. A prerequisite for durable PVI are transmural and contiguous circumferential lesions around the pulmonary veins. However, electrical reconnection of initially isolated pulmonary veins remains a primary concern and is a dominant factor for arrhythmia recurrence during long-term follow up...
July 24, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28718606/-interventional-treatment-of-venous-insufficiency
#14
Barbara Ney, Rolf P Engelberger, Amin Dabiri, Jean-François Lüthi, Andreas Erdmann, Caroline Krieger, Sébastien Déglise, Thierry Merminod, Philippe Kern, Lucia Mazzolai
Interventional treatment of venous insufficiency has been revolutionized by endovascular techniques. Some of these techniques, and particularly thermal ablation (endovenous laser, radiofrequency) are now recommended as first-line therapy in the latest international guidelines. This is because of less post-operative pain, a shorter leave from employment and similar or lower recurrence rate. Endovenous techniques allow safer and more efficient treatment of certain particular conditions : small saphenous vein, ulcers, and recurrent varicose veins...
March 15, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28714577/direct-laser-interference-patterning-of-cocr-alloy-surfaces-to-control-endothelial-cell-and-platelet-response-for-cardiovascular-applications
#15
Romain Schieber, Federico Lasserre, Michael Hans, Marc Fernández-Yagüe, Maribel Díaz-Ricart, Ginés Escolar, Maria-Pau Ginebra, Frank Mücklich, Marta Pegueroles
The main drawbacks of cardiovascular bare-metal stents (BMS) are in-stent restenosis and stent thrombosis as a result of an incomplete endothelialization after stent implantation. Nano- and microscale modification of implant surfaces is a strategy to recover the functionality of the artery by stimulating and guiding molecular and biological processes at the implant/tissue interface. In this study, cobalt-chromium (CoCr) alloy surfaces are modified via direct laser interference patterning (DLIP) in order to create linear patterning onto CoCr surfaces with different periodicities (≈3, 10, 20, and 32 µm) and depths (≈20 and 800 nm)...
July 17, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28696330/artificial-insect-wings-with-biomimetic-wing-morphology-and-mechanical-properties
#16
Zhiwei Liu, Xiaojun Yan, Mingjing Qi, Yangsheng Zhu, Dawei Huang, X Y Zhang, Liwei Lin
The pursuit of high lift force for insect-scale Flapping-wing Micro Aerial Vehicle (FMAV) requires its artificial wings to own biomimetic wing features which are close to its nature counterpart. In this work, we present both fabrication and testing methods for artificial insect wings with biomimetic wing morphology and mechanical properties. The artificial cicada (Hyalessa maculaticollis) wing is fabricated through high precision laser cutting technique and bonding process of multilayer materials. Through controlling the shape of wing venation, the fabrication method can achieve 3-D (three dimensional) wing architecture including cambers or corrugations...
July 11, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28695222/ratiometric-in-vivo-auditioning-of-targeted-silver-nanoparticles
#17
Kadri Toome, Anne-Mari A Willmore, Päärn Paiste, Allan Tobi, Kazuki N Sugahara, Kalle Kirsimäe, Erkki Ruoslahti, Gary B Braun, Tambet Teesalu
Attaching affinity ligands to nanoparticles (NPs) increases selectivity for targeting cells and tissues, and can result in improved sensitivity and reduced off-target toxicity in diagnostic and therapeutic systems. The decision over key features - NP size, shape, coating strategies and targeting ligands for clinical translation is often hampered by a lack of quantitative in vivo NP homing assays. Sensitive, internally controlled assays are needed which allow for quantitative comparisons (auditions) among various formulations of targeted NPs...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28656342/effect-of-intravitreal-ranibizumab-on-the-ocular-circulation-of-the-untreated-fellow-eye
#18
Masahiko Sugimoto, Takayasu Nunome, Rie Sakamoto, Maki Kobayashi, Mineo Kondo
PURPOSE: To evaluate the effects of unilateral intravitreal ranibizumab (IVR) on the ocular circulation of the fellow eyes. METHODS: Fifteen eyes of 15 patients with macular edema (average age 69.6 ± 11.8 years) were studied. Eleven eyes had diabetic macular edema (DME) and four eyes had macular edema associated with a branch retinal vein occlusion. Each eye received 0.5 mg of IVR. The blood circulation on the optic nerve head of the treated and untreated eyes were determined by laser speckle flowgraphy (LSFG, Softcare Co...
August 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28652904/successful-treatment-of-unilateral-klippel-trenaunay-syndrome-with-pulsed-dye-laser-in-a-2-week-old-infant
#19
Hoda Rahimi, Habib Hassannejad, Hamideh Moravvej
Introduction: Klippel-Trenaunay syndrome (KTS) is a rare congenital mesodermal abnormality characterized by varicose veins, cutaneous capillary malformation, as well as bone and soft tissue hypertrophy. Case Report: A 2-week-old female infant presented to our clinic because of vascular nevus and progressive enlargement of her right extremities and trunk since birth. The patient was treated with 595-nm pulsed-dye laser (PDL). Her port-wine stain (PWS) disappeared completely after third PDL session and the soft tissue hypertrophy stopped...
2017: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/28647634/more-successful-results-with-less-energy-in-endovenous-laser-ablation-treatment-long-term-comparison-of-bare-tip-fiber980nm-laser-and-radial-tip-fiber1470nm-laser-application
#20
Ümit Arslan, Eyüpserhat Çalık, Mehmet Tort, Ziya Yıldız, Ali İhsan Tekin, Hüsnü Kamil Limandal, Mehmet Ali Kaygın, Özgür Dağ, Bilgehan Erkut
BACKGROUND: Varices and venous insufficiency are common and serious health problems in the general population which affect quality of life. Endothermal treatment of the great saphenous vein has become the first line of treatment for superficial venous reflux, and the endovenous laser ablation (EVLA) method has been widely accepted all over the world. In this method, ablation is provided by a laser fiber inserted into the lumen of the vein. Initially, the fibers were 810 nm, but today the fibers are usually 940, 980, or 1470 nm...
June 21, 2017: Annals of Vascular Surgery
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