Objectives: To determine the relative levels of 3 potent inhibitors of angiogenesis (endostatin, pigment epithelium-derived factor, and thrombospondin 1) in the retinal pigment epithelium-Bruch's membrane-choriocapillaris complex in the submacular region in aged control eyes and eyes with age-related macular degeneration (AMD).
Methods: Immunohistochemical analysis with antibodies against endostatin, pigment epithelium-derived factor, and thrombospondin 1 was performed on the macular region of aged control donor eyes (n = 8; mean age, 79.8 years) and eyes with AMD (n = 12; mean age, 83.9 years). Three independent masked observers scored the reaction product (scored from 0-7). Mean scores from the control eyes and the eyes with AMD were analyzed using 1-way analysis of variance and unpaired t test.
Results: In control eyes, strong immunoreactivity of all 3 inhibitors was observed in the retinal pigment epithelium-Bruch's membrane-choriocapillaris complex. Immunoreactivity for endostatin, pigment epithelium-derived factor, and thrombospondin 1 in Bruch's membrane was significantly lower in eyes with AMD compared with aged control eyes (analysis of variance, P = .003, P = .009, and P < .001, respectively). In the choriocapillaris, a significant reduction was observed in endostatin (analysis of variance, P = .02) and thrombospondin 1 (analysis of variance, P = .005) in eyes with AMD.
Conclusions: These findings suggest that endogenous angiogenesis inhibitors in the retinal pigment epithelium-Bruch's membrane-choriocapillaris complex may provide a biochemical barrier for choroidal neovascular invasion.
Clinical Relevance: Decreased levels of angiogenic inhibitors at the retinal pigment epithelium-Bruch's membrane-choriocapillaris complex in eyes with AMD make Bruch's membrane vulnerable to choroidal neovascularization.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4943079 | PMC |
| http://dx.doi.org/10.1001/archopht.126.5.670 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Neuroretinal and RPE changes and susceptibility to Age-Related Macular Degeneration: insights from the longitudinal Alienor Study.
Ophthalmology
January 2025
University of Bordeaux, INSERM, BPH, U1219, F-33000 Bordeaux, France; FRCRnet, F-CRIN network, France.
Purpose: We assessed the associations of macular layer thicknesses, measured using spectral-domain OCT (SD-OCT), with incident age-related macular degeneration (AMD) and AMD polygenic risk scores (PRS).
Design: Population-based cohort study PARTICIPANTS: 653 participants of the Alienor study, with biennial eye imaging from 2009 to 2024.
Methods: Macular layer thicknesses of eight distinct layers and three compound layers were automatically segmented based on SD-OCT imaging of the macula.
Fractionation and identification of ocular protective compounds from Kochiae Fructus against oxidative damage in retinal pigment epithelium cells.
J Ethnopharmacol
January 2025
Chinese Medicine Research and Development Center, China Medical University Hospital, Taichung 40447, Taiwan; Graduate Institute of Integrated Medicine, College of Chinese Medicine, China Medical University, Taichung 40402, Taiwan; Master Program of Pharmaceutical Manufacture, College of Pharmacy, China Medical University, Taichung 40402, Taiwan; Department of Medical Laboratory Science and Biotechnology, College of Medical and Health Science, Asia University, Taichung 41354, Taiwan. Electronic address:
Ethnopharmacological Relevance: Kochiae Fructus, the ripe fruit of Kochia scoparia, is a traditional Chinese medicine commonly used to treat eye discomforts and vision problems. Although Kochiae Fructus is mentioned in many classical Chinese medical texts, its protective effects and the roles of its active phytochemicals in eye treatment still lack scientific exploration.
Aim Of The Study: This study aimed to clarify the protective effects and identify the active fractions and compounds of Kochiae Fructus against oxidative stress-induced retinal pigment epithelium (RPE) cell death.
Systemic Sodium Iodate Injection as a Model for Expanding Geographic Atrophy.
Transl Vis Sci Technol
January 2025
FM Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, Department of Ophthalmology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
Purpose: Geographic atrophy (GA), an advanced form of dry age-related macular degeneration (AMD), has limited treatment options. This study introduces a novel mouse model featuring an expanding GA patch that can be used to test mechanisms and therapeutics.
Methods: C57Bl/6J male mice (n = 96) aged 9-10 weeks received an intraperitoneal (IP) injection of 20 mg/kg sodium iodate (NaIO3).
Mechanisms of Rhodopsin-Related Inherited Retinal Degeneration and Pharmacological Treatment Strategies.
Cells
January 2025
Department of Pharmacology, School of Medicine, Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH 44106, USA.
Retinitis pigmentosa (RP) is a hereditary disease characterized by progressive vision loss ultimately leading to blindness. This condition is initiated by mutations in genes expressed in retinal cells, resulting in the degeneration of rod photoreceptors, which is subsequently followed by the loss of cone photoreceptors. Mutations in various genes expressed in the retina are associated with RP.
View Article and Find Full Text PDFKlotho attenuates epithelial‑mesenchymal transition of retinal pigment epithelial cells in subretinal fibrosis by suppressing the ERK1/2 and Wnt/β‑catenin signaling pathways.
Int J Mol Med
March 2025
Department of Ophthalmology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China.
Retinal pigment epithelial (RPE) cells undergoing epithelial‑mesenchymal transition (EMT) are a key factor in promoting the progression of subretinal fibrosis. The klotho protein and gene exert anti‑fibrotic effects in multiple fibrotic diseases. However, the mechanisms involved in the role of klotho are unclear in subretinal fibrosis.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!