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Yang H, Hou Y, Yu PK, Lu W, Sun X, Yu DY. Region-related and layer-specific permeability of the iris vasculature with morphological mechanism: A novel understanding of blood-aqueous barrier. Exp Eye Res 2023; 230:109445. [PMID: 36948437 DOI: 10.1016/j.exer.2023.109445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 02/24/2023] [Accepted: 03/16/2023] [Indexed: 03/24/2023]
Abstract
The permeability of iris blood vessels has an important role in maintaining aqueous humor (AH) homeostasis, contributing to variation in iris volume and probably the pathogenesis of angle closure glaucoma. This study investigates the permeability of the iris microvasculature to plasma-derived protein and correspond it with the morphologic characteristics of vascular mural cells (MCs). Twenty-two enucleated porcine eyes were used in this study. 12 eyes were micro-perfused with vehicle alone as control or with FITC-albumin as a marker of protein leakage and histological sections subsequently made to examine for FITC-albumin presence. The other 10 eyes were immunolabeled via micro-perfusion for αSMA and VE-cadherin to investigate their topographic distribution in the porcine iris vasculature, and to cross correspond with the locations of FITC-albumin deposits. Distribution of FITC-signals exhibited a site-dependent pattern and time-dependent change in the iris. Fluorescence was initially detected around capillaries in the superficial and deep layer of the iris microvascular network. The pupillary region and the iris root retained more fluorescent signal than the iridal ciliary region. At low magnification, αSMA labelling displayed a regional variation which was inversely correlated with vascular permeability. At the cellular level, αSMA labeling corresponded with vascular MCs distribution in the iris vascular network. The correspondence between iris microvascular permeability to FITC-albumin and the pattern of αSMA distribution and MCs coverage adds to the understanding of the elements comprising the blood-aqueous barrier with implications for the bio-mechanics of iris volume change.
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Affiliation(s)
- Hongfang Yang
- Department of Ophthalmology & Visual Science, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai, China; NHC Key Laboratory of Myopia, Chinese Academy of Medical Sciences, And Shanghai Key Laboratory of Visual Impairment and Restoration (Fudan University), Shanghai, China
| | - Yu Hou
- Department of Ophthalmology & Visual Science, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai, China; NHC Key Laboratory of Myopia, Chinese Academy of Medical Sciences, And Shanghai Key Laboratory of Visual Impairment and Restoration (Fudan University), Shanghai, China
| | - Paula K Yu
- Centre for Ophthalmology and Visual Science, University of Western Australia, Perth, Australia; Lions Eye Institute, Nedlands, Western Australia, Australia
| | - Wenhan Lu
- Department of Ophthalmology & Visual Science, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai, China; NHC Key Laboratory of Myopia, Chinese Academy of Medical Sciences, And Shanghai Key Laboratory of Visual Impairment and Restoration (Fudan University), Shanghai, China
| | - Xinghuai Sun
- Department of Ophthalmology & Visual Science, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai, China; NHC Key Laboratory of Myopia, Chinese Academy of Medical Sciences, And Shanghai Key Laboratory of Visual Impairment and Restoration (Fudan University), Shanghai, China; State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - Dao-Yi Yu
- Centre for Ophthalmology and Visual Science, University of Western Australia, Perth, Australia; Lions Eye Institute, Nedlands, Western Australia, Australia.
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Quantitative changes in iris vasculature and blood flow in patients with different refractive errors. Graefes Arch Clin Exp Ophthalmol 2022; 260:3123-3129. [DOI: 10.1007/s00417-022-05632-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 03/01/2022] [Accepted: 03/10/2022] [Indexed: 11/04/2022] Open
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Voronin GV, Petrov SY, Volzhanin AV, El-Sangahawi AA, Avetisov KS. [Iris shape change and risk of anterior chamber angle closure]. Vestn Oftalmol 2020; 136:93-98. [PMID: 32366076 DOI: 10.17116/oftalma202013602193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Potential obstruction of the anterior chamber angle by iris root is a key factor of the pathogenesis of angle-closure glaucoma. Development and adoption of ultrasound biomicroscopy and optical coherence tomography in clinical practice have significantly expanded the capabilities of studying the structures of the anterior eye segment in terms of angle closure risk factors through improving visualization depth and quality of examination, including different variants of iris structure and potential changes of its shape in mydriasis. The article reviews various studies dedicated to the progression of primary angle-closure glaucoma and its dependence on the biometric parameters of the eye and changes in pupil size.
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Affiliation(s)
- G V Voronin
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia.,Research Institute of Eye Diseases, Moscow, Russia
| | - S Yu Petrov
- Research Institute of Eye Diseases, Moscow, Russia
| | | | - A A El-Sangahawi
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
| | - K S Avetisov
- Research Institute of Eye Diseases, Moscow, Russia
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Zhao H, Wang G, Lin R, Gong X, Song L, Li T, Wang W, Zhang K, Qian X, Zhang H, Li L, Liu Z, Liu C. Three-dimensional Hessian matrix-based quantitative vascular imaging of rat iris with optical-resolution photoacoustic microscopy in vivo. JOURNAL OF BIOMEDICAL OPTICS 2018; 23:1-11. [PMID: 29687685 DOI: 10.1117/1.jbo.23.4.046006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 03/19/2018] [Indexed: 05/10/2023]
Abstract
For the diagnosis and evaluation of ophthalmic diseases, imaging and quantitative characterization of vasculature in the iris are very important. The recently developed photoacoustic imaging, which is ultrasensitive in imaging endogenous hemoglobin molecules, provides a highly efficient label-free method for imaging blood vasculature in the iris. However, the development of advanced vascular quantification algorithms is still needed to enable accurate characterization of the underlying vasculature. We have developed a vascular information quantification algorithm by adopting a three-dimensional (3-D) Hessian matrix and applied for processing iris vasculature images obtained with a custom-built optical-resolution photoacoustic imaging system (OR-PAM). For the first time, we demonstrate in vivo 3-D vascular structures of a rat iris with a the label-free imaging method and also accurately extract quantitative vascular information, such as vessel diameter, vascular density, and vascular tortuosity. Our results indicate that the developed algorithm is capable of quantifying the vasculature in the 3-D photoacoustic images of the iris in-vivo, thus enhancing the diagnostic capability of the OR-PAM system for vascular-related ophthalmic diseases in vivo.
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Affiliation(s)
- Huangxuan Zhao
- Capital Medical Univ., China
- Shenzhen Institutes of Advanced Technology, China
| | | | - Riqiang Lin
- Shenzhen Institutes of Advanced Technology, China
| | | | - Liang Song
- Shenzhen Institutes of Advanced Technology, China
| | - Tan Li
- Capital Medical Univ., China
| | | | | | | | | | - Lin Li
- Capital Medical Univ., China
| | | | - Chengbo Liu
- Shenzhen Institutes of Advanced Technology, China
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Yang H, Yu PK, Cringle SJ, Sun X, Yu DY. Microvascular Network and Its Endothelial Cells in the Human Iris. Curr Eye Res 2017; 43:67-76. [DOI: 10.1080/02713683.2017.1379544] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Hongfang Yang
- Centre for Ophthalmology and Visual Science, The University of Western Australia, Perth, Australia
- Physiology and Pharmacology Centre, Lions Eye Institute, The University of Western Australia, Perth, Australia
- Department of Ophthalmology & Visual Science, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Paula K Yu
- Centre for Ophthalmology and Visual Science, The University of Western Australia, Perth, Australia
- Physiology and Pharmacology Centre, Lions Eye Institute, The University of Western Australia, Perth, Australia
| | - Stephen J Cringle
- Centre for Ophthalmology and Visual Science, The University of Western Australia, Perth, Australia
- Physiology and Pharmacology Centre, Lions Eye Institute, The University of Western Australia, Perth, Australia
| | - Xinghuai Sun
- Department of Ophthalmology & Visual Science, Eye & ENT Hospital, Shanghai Medical College, Fudan University, Shanghai, China
- State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, China
- Key Laboratory of Myopia, Ministry of Health (Fudan University), and Shanghai Key Laboratory of Visual Impairment and Restoration, Fudan University, Shanghai China
| | - Dao-Yi Yu
- Centre for Ophthalmology and Visual Science, The University of Western Australia, Perth, Australia
- Physiology and Pharmacology Centre, Lions Eye Institute, The University of Western Australia, Perth, Australia
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Sun X, Dai Y, Chen Y, Yu DY, Cringle SJ, Chen J, Kong X, Wang X, Jiang C. Primary angle closure glaucoma: What we know and what we don’t know. Prog Retin Eye Res 2017; 57:26-45. [DOI: 10.1016/j.preteyeres.2016.12.003] [Citation(s) in RCA: 171] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 11/18/2016] [Accepted: 12/07/2016] [Indexed: 01/25/2023]
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Intracellular cytoskeleton and junction proteins of endothelial cells in the porcine iris microvasculature. Exp Eye Res 2015; 140:106-116. [DOI: 10.1016/j.exer.2015.08.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 08/21/2015] [Accepted: 08/27/2015] [Indexed: 01/31/2023]
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