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Neovascularization cornea

V Kocaba, O Damour, C Auxenfans, C Burillon
Limbal stem cell deficiency is predominantly caused by severe eye burns resulting in a decreased or a complete ablation of the regenerative potential of these stem cells. The inability to reconstruct the corneal epithelium further leads conjunctivalization of the gimbal-epithelial barrier. These abnormalities collectively result in the progressive opacification of the cornea responsible for blindness that is driven by chronic corneal ulceration and neovascularization. The underlying pathology of the cornea affects the homeostasis of the neighboring conjunctiva, eyelids, and tear film...
October 11, 2016: Journal Français D'ophtalmologie
Takashi Suzuki, Naoyuki Morishige, Reiko Arita, Shizuka Koh, Tohru Sakimoto, Rika Shirakawa, Kazunori Miyata, Yuichi Ohashi
BACKGROUND: Phlyctenular keratitis is a hypersensitivity reaction of the cornea, and a complication of eyelid margin disease in children and young adults. In this study, we compared the morphology of the meibomian glands in eyelids between phlyctenular keratitis patients and healthy young adults, using noncontact meibography. METHODS: The study included 16 eyes of 13 patients diagnosed with phlyctenular keratitis and 17 eyes of 17 healthy volunteers. Slit-lamp observations of the cornea and eyelid were performed on all subjects...
October 10, 2016: BMC Ophthalmology
Yoko Sone, Shingo Takatori, Eiko Ochi, Yoshito Zamami, Akiko Matsuyama, Satoko Fukuhara, Mitsuhiro Goda, Yoshihisa Kitamura, Hiromu Kawasaki
BACKGROUND: Tumor neovascular vessels are not innervated by perivascular nerves. This study was an investigation of the effects of the nerve growth factor (NGF) on the distribution of perivascular nerves and neovessel formation in tumor tissues. METHODS: A gel containing DU145 prostate carcinoma cells or HT1080 fibrosarcoma cells was implanted into mouse corneas. NGF was subcutaneously administered using an osmotic mini-pump. The distribution of perivascular nerves in mouse corneas and densities of CD31-immunopositive neovessels and smooth muscles (α-smooth muscle actin, α-SMA) in tumor tissues were quantified...
October 1, 2016: Pharmacology
Jae Yong Kim, Soo Yeon Kim, Mi Hyun Cheon, Eun-Soon Kim, In Seok Song, Myoung Joon Kim, Hungwon Tchah
AIM: To investigate the antiangiogenic effects and safety of topically administered low-molecular-weight heparin-taurocholate 7 (LHT7) on corneal neovascularization (CoNV). METHODS: Twenty-four Sprague-Dawley rats were randomly distributed into four groups of six rats each. The central corneas were cauterized using a silver/potassium nitrate solution. From 2d after cauterization, 12.5 mg/mL (low LHT7 group) or 25 mg/mL (high LHT7 group) LHT7 was topically administered three times daily; 12...
2016: International Journal of Ophthalmology
Houfa Yin, Peijin Qiu, Fang Wu, Wei Zhang, Wenqi Teng, Zhenwei Qin, Chao Li, Jiaojie Zhou, Zhi Fang, Qiaomei Tang, Qiuli Fu, Jian Ma, Yabo Yang
The scarcity of corneal tissue to treat deep corneal defects and corneal perforations remains a challenge. Currently, small incision lenticule extraction (SMILE)-derived lenticules appear to be a promising alternative for the treatment of these conditions. However, the thickness and toughness of a single piece of lenticule are limited. To overcome these limitations, we constructed a corneal stromal equivalent with SMILE-derived lenticules and fibrin glue. In vitro cell culture revealed that the corneal stromal equivalent could provide a suitable scaffold for the survival and proliferation of corneal epithelial cells, which formed a continuous pluristratified epithelium with the expression of characteristic markers...
2016: Scientific Reports
Jun Ho Lee, Ki Hean Kim, Seunghun Lee, Hyerin Jeong, Myoung Joon Kim
PURPOSE: To investigate the 3-dimensional (3D) cell and extracellular matrix (ECM) structure of mouse peripheral corneas in normal and corneal neovascularization tissues using 2-photon microscopy (TPM) based on both intrinsic and extrinsic moxifloxacin contrasts. METHODS: Peripheral corneas in freshly enucleated mouse eyes were imaged by TPM based on both intrinsic and extrinsic contrasts. Intrinsic autofluorescence and second harmonic generation were used to image cells and ECM collagen, respectively...
November 2016: Cornea
Kuan-I Wu, Hsiao-Sang Chu, Amy Shih-I Pai, Yu-Chih Hou, Szu-Yuan Lin, Wei-Li Chen, Fung-Rong Hu
PURPOSE: To assess the surgical and clinical outcomes of anterior lamellar keratoplasty using anterior corneal buttons from Descemet stripping automated endothelial keratoplasty (DSAEK) donor tissue. METHODS: Retrospective data from 8 patients with unilateral limbal dermoids, treated between February 2011 and January 2016 at National Taiwan University Hospital, were analyzed. Donor corneas for DSAEK were divided into anterior and posterior lamellae using a 350-μm microkeratome...
September 8, 2016: Cornea
Shinichi Fukuda, Kensuke Okuda, Genichiro Kishino, Sujin Hoshi, Itsuki Kawano, Masahiro Fukuda, Toshiharu Yamashita, Simone Beheregaray, Masumi Nagano, Osamu Ohneda, Hideko Nagasawa, Tetsuro Oshika
PURPOSE: Retinal hypoxia plays a crucial role in ocular neovascular diseases, such as diabetic retinopathy, retinopathy of prematurity, and retinal vascular occlusion. Fluorescein angiography is useful for identifying the hypoxia extent by detecting non-perfusion areas or neovascularization, but its ability to detect early stages of hypoxia is limited. Recently, in vivo fluorescent probes for detecting hypoxia have been developed; however, these have not been extensively applied in ophthalmology...
August 29, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
Emma Ghazaryan, Yan Zhang, Yuxi He, Xin Liu, Ying Li, Jianan Xie, Guanfang Su
The purpose of the present study is to investigate the effect of mesenchymal stem cells in corneal neovascularization and wound healing, and to compare the effectiveness of two possible application routes, subconjunctival injection and amniotic membrane transplantation. Chemical injury was induced by application of sodium hydroxide to the rats' corneas. After 7 days, the animals were divided into three groups. Different treatment methods were used for each group as follows: i) Group 1, injection of bone marrow‑derived mesenchymal stem cells (BMSCs) under the conjunctiva; ii) group 2, transplantation of amniotic membranes, previously seeded with BMSCs; and iii) group 3, the untreated control group...
October 2016: Molecular Medicine Reports
Antonio Di Zazzo, Maryam Tahvildari, Brinda Subbarayal, Jia Yin, Thomas H Dohlman, Takenori Inomata, Alireza Mashaghi, Sunil K Chauhan, Reza Dana
BACKGROUND: Corneal neovascularization increases the risk of T cell mediated allograft rejection. Here, we investigate whether T cells promote angiogenesis in transplantation. METHODS: Conventional effector T cells were collected from draining lymph nodes (DLNs) of allogeneic or syngeneic corneal transplanted BALB/c mice. T cells were either cocultured with vascular endothelial cells (VECs) to assess VEC proliferation or used in a Mixed Lymphocyte Reaction assay...
August 3, 2016: Transplantation
Hossein Mostafa Elbadawy, Pierfrancesco Mirabelli, Maria Xeroudaki, Mohit Parekh, Marina Bertolin, Claudia Breda, Carlo Cagini, Diego Ponzin, Neil Lagali, Stefano Ferrari
BACKGROUND AND PURPOSE: The connexin 43 (Cx43) mimetic peptide Gap27 was designed to transiently block the function of this gap junction. This study was undertaken to investigate the effect of Gap27 on corneal healing, inflammation and neovascularization. EXPERIMENTAL APPROACH: The effect of Gap27 on wound healing, inflammation and vascularization was assessed in primary human corneal epithelial cells (HCEC) in vitro and whole human corneas ex vivo, and in an in vivo rat wound healing model...
October 2016: British Journal of Pharmacology
Gaoqin Liu, Hongya Wu, Peirong Lu, Xueguang Zhang
PURPOSE: To explore the roles of interleukin (IL)-17A in alkali-induced corneal neovascularization (CRNV). METHODS: Induction of CRNV by alkali injury was performed and compared in recombinant mouse IL-17A protein or anti-mouse IL-17A neutralizing antibody (Ab)-treated mice. The expression of IL-17A, IL-17A receptor (IL-17RA), vascular endothelial growth factor (VEGF), IL-6, IL-8, and monocyte chemoattractant protein-1 (MCP-1) in burned corneas or other cells was examined by RT-PCR and western blot...
July 15, 2016: Current Eye Research
Yi Lu, Ying Zheng, Jianzhong Ai, Xun Xu
Corneal neovascularization (NV) is one of the major sight-threatening pathological changes caused by corneal diseases. Current therapeutics generate various adverse effects. Small peptides derived from endogenous protein display certain advantages. This study aims to evaluate the anti-angiogenic effect and molecular mechanism of a novel peptide ZY-1, derived from placental growth factor-1 (PlGF-1), on corneal NV by topical administration, and to investigate its safety profile after long-term treatment. CCK-8 assay and tube formation assay were used to evaluate the effect of ZY-1 on human umbilical vein endothelial cells (HUVECs)...
May 2016: Discovery Medicine
Yanfeng Chen, Wenzhao Yang, Xiaobo Zhang, Shu Yang, Gao Peng, Ting Wu, Yueping Zhou, Caihong Huang, Peter S Reinach, Wei Li, Zuguo Liu
MK2 activation by p38 MAPK selectively induces inflammation in various diseases. We determined if a MK2 inhibitor (MK2i), improves cornea wound healing by inhibiting inflammation caused by burning rat corneas with alkali. Our study, for the first time, demonstrated that MK2i inhibited alkali burn-induced MK2 activation as well as rises in inflammation based on: a) blunting rises in inflammatory index, inflammatory cell infiltration, ED1(+) macrophage and PMN(+) neutrophil infiltration; b) suppressing IL-6 and IL-1β gene expression along with those of macrophage inflammatory protein-1α (MIP-1α), intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1); c) reducing angiogenic gene expression levels and neovascularization (NV) whereas anti-angiogenic PEDF levels increased...
2016: Scientific Reports
S Belghmaidi, I Hajji, W Ennassiri, R Benhaddou, T Baha Ali, A Moutaouakil
INTRODUCTION: The avascular nature of the cornea results from a balance between angiogenic factors and anti-angiogenic factors. Under pathological conditions, this homeostasis can be disturbed, resulting in the onset of corneal neovascularization. The purpose of our study was to report our experience in the management of corneal neovascularization prior to keratoplasty. MATERIALS AND METHODS: This is a prospective study of 112 patients with corneal neovascularization and candidates for possible corneal transplant...
June 2016: Journal Français D'ophtalmologie
Nizar Saleh Abdelfattah, Mohamed Amgad, Amira A Zayed, Heba Hussein, Nawal Abd El-Baky
The cornea is maintained in an avascular state by maintaining an environment whereby anti-angiogenic factors take the upper hand over factors promoting angiogenesis. Many of the common pathologies affecting the cornea involve the disruption of such equilibrium and the shift towards new vessel formation, leading to corneal opacity and eventually-vision loss. Therefore it is of paramount importance that the molecular underpinnings of corneal neovascularization (CNV) be clearly understood, in order to develop better targeted treatments...
2016: International Journal of Ophthalmology
Maria A Amesty, Alejandra E Rodriguez, Enrique Hernández, Maria P De Miguel, Jorge L Alio
PURPOSE: To study the tolerance and biocompatibility of mineral pigments for corneal pigmentation histopathologically and immunologically in an experimental animal model. METHODS: Manual intralamellar keratopigmentation was performed in 28 New Zealand white rabbits using micronized mineral pigments. Histopathological examination was performed 3 months after the surgery to determine the level of pigment diffusion, the level of inflammation, and the presence/absence of neovascularization...
September 2016: Cornea
Jin-Hong Chang, Ilham Putra, Yu-Hui Huang, Michael Chang, Kyuyeon Han, Wei Zhong, Xinbo Gao, Shuangyong Wang, Jennifer Dugas-Ford, Tara Nguyen, Young-Kwon Hong, Dimitri T Azar
BACKGROUND: Immunohistochemical staining experiments have shown that both hemangiogenesis and lymphangiogenesis occur following severe corneal and conjunctival injury and that the neovascularization of the cornea often has severe visual consequences. To better understand how hemangiogenesis and lymphangiogenesis are induced by different degrees of ocular injury, we investigated patterns of injury-induced corneal neovascularization in live Prox1-GFP/Flk1::myr-mCherry mice, in which blood and lymphatic vessels can be imaged simultaneously in vivo...
October 2016: Biochimica et Biophysica Acta
Harry W Roberts, Nick J R Maycock, David P S OʼBrart
PURPOSE: To report a series of 4 cases (3 patients) with late stromal graft rejection 32 to 46 months after an uneventful deep anterior lamellar keratoplasty (DALK). METHODS: Three patients (4 eyes), who had undergone an uneventful DALK for keratoconus (3 eyes) and infectious keratitis (1 eye) 32 to 46 months previously presented with a history of ocular discomfort and redness, with reduced visual acuity in 3 eyes. In all cases, all sutures had been removed at least 18 months previously...
September 2016: Cornea
Xue-Jun Gu, Xian Liu, Ying-Ying Chen, Yao Zhao, Man Xu, Xiao-Jian Han, Qiu-Ping Liu, Jing-Lin Yi, Jing-Ming Li
Chemical burns are a major cause of corneal injury. Oxidative stress, inflammatory responses and neovascularization after the chemical burn aggravate corneal damage, and lead to loss of vision. Although NADPH oxidases (Noxs) play a crucial role in the production of reactive oxygen species (ROS), the role of Noxs in chemical burn-induced corneal injury remains to be elucidated. In the present study, the transcription and expression of Noxs in corneas were examined by RT-qPCR, western blot analysis and immunofluorescence staining...
July 2016: International Journal of Molecular Medicine
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