scholarly journals Quick-Freeze/Deep-Etch Visualization of Age-Related Lipid Accumulation in Bruch’s Membrane

2003 ◽  
Vol 44 (4) ◽  
pp. 1753 ◽  
Author(s):  
Jeffrey W. Ruberti ◽  
Christine A. Curcio ◽  
C. Leigh Millican ◽  
Bert P. M. Menco ◽  
Jiahn-Dar Huang ◽  
...  
Keyword(s):  
Lipid Accumulation ◽  
Bruch's Membrane ◽  
Bruch’S Membrane ◽  
Age Related

scholarly journals Lipid accumulation and protein modifications of Bruch’s membrane in age-related macular degeneration

2021 ◽  
Vol 14 (5) ◽  
pp. 766-773
Author(s):  
Li-Hui Meng ◽  
Keyword(s):  
Macular Degeneration ◽  
Lipid Accumulation ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Age Related Macular Degeneration ◽  
Bruch's Membrane ◽  
Bruch’S Membrane ◽  
Novel Therapy ◽  
Protein Modifications ◽  
Age Related

Age-related macular degeneration (AMD) is a progressive retinal disease, which is the leading cause of blindness in western countries. There is an urgency to establish new therapeutic strategies that could prevent or delay the progression of AMD more efficiently. Until now, the pathogenesis of AMD has remained unclear, limiting the development of the novel therapy. Bruch's membrane (BM) goes through remarkable changes in AMD, playing a significant role during the disease course. The main aim of this review is to present the crucial processes that occur at the level of BM, with special consideration of the lipid accumulation and protein modifications. Besides, some therapies targeted at these molecules and the construction of BM in tissue engineering of retinal pigment epithelium (RPE) cells transplantation were listed. Hopefully, this review may provide a reference for researchers engaged in pathogenesis or management on AMD.

scholarly journals FHL-1 interacts with human RPE cells through the α5β1 integrin and confers protection against oxidative stress

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rawshan Choudhury ◽  
Nadhim Bayatti ◽  
Richard Scharff ◽  
Ewa Szula ◽  
Viranga Tilakaratna ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Cell Fate ◽  
Retinal Pigment ◽  
Factor H ◽  
Age Related Macular Degeneration ◽  
Bruch's Membrane ◽  
Bruch’S Membrane ◽  
Rpe Cells ◽  
Age Related

AbstractRetinal pigment epithelial (RPE) cells that underlie the neurosensory retina are essential for the maintenance of photoreceptor cells and hence vision. Interactions between the RPE and their basement membrane, i.e. the inner layer of Bruch’s membrane, are essential for RPE cell health and function, but the signals induced by Bruch’s membrane engagement, and their contributions to RPE cell fate determination remain poorly defined. Here, we studied the functional role of the soluble complement regulator and component of Bruch’s membrane, Factor H-like protein 1 (FHL-1). Human primary RPE cells adhered to FHL-1 in a manner that was eliminated by either mutagenesis of the integrin-binding RGD motif in FHL-1 or by using competing antibodies directed against the α5 and β1 integrin subunits. These short-term experiments reveal an immediate protein-integrin interaction that were obtained from primary RPE cells and replicated using the hTERT-RPE1 cell line. Separate, longer term experiments utilising RNAseq analysis of hTERT-RPE1 cells bound to FHL-1, showed an increased expression of the heat-shock protein genes HSPA6, CRYAB, HSPA1A and HSPA1B when compared to cells bound to fibronectin (FN) or laminin (LA). Pathway analysis implicated changes in EIF2 signalling, the unfolded protein response, and mineralocorticoid receptor signalling as putative pathways. Subsequent cell survival assays using H2O2 to induce oxidative stress-induced cell death suggest hTERT-RPE1 cells had significantly greater protection when bound to FHL-1 or LA compared to plastic or FN. These data show a non-canonical role of FHL-1 in protecting RPE cells against oxidative stress and identifies a novel interaction that has implications for ocular diseases such as age-related macular degeneration.

scholarly journals Developmental and age-related changes to the elastic lamina of Bruch’s membrane in mice

2018 ◽  
Vol 257 (2) ◽  
pp. 289-301 ◽  
Author(s):  
Hidetsugu Mori ◽  
Haruhiko Yamada ◽  
Keiko Toyama ◽  
Kanji Takahashi ◽  
Tomoya Akama ◽  
...  
Keyword(s):  
Bruch's Membrane ◽  
Bruch’S Membrane ◽  
Age Related ◽  
Elastic Lamina ◽  
Age Related Changes

scholarly journals Changes in Retinal Structure and Ultrastructure in the Aged Mice Correlate With Differences in the Expression of Selected Retinal miRNAs

2021 ◽  
Vol 11 ◽  
Author(s):  
Anca Hermenean ◽  
Maria Consiglia Trotta ◽  
Sami Gharbia ◽  
Andrei Gelu Hermenean ◽  
Victor Eduard Peteu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Amorphous Materials ◽  
Retinal Pigment ◽  
Ultrastructural Changes ◽  
Male Mice ◽  
Bruch's Membrane ◽  
Bruch’S Membrane ◽  
Female Mice ◽  
Biological Sex ◽  
Age Related

Age and gender are two important factors that may influence the function and structure of the retina and its susceptibility to retinal diseases. The aim of this study was to delineate the influence that biological sex and age exert on the retinal structural and ultrastructural changes in mice and to identify the age-related miRNA dysregulation profiles in the retina by gender. Experiments were undertaken on male and female Balb/c aged 24 months (approximately 75–85 years in humans) compared to the control (3 months). The retinas were analyzed by histology, transmission electron microscopy, and age-related miRNA expression profile analysis. Retinas of both sexes showed a steady decline in retinal thickness as follows: photoreceptor (PS) and outer layers (p < 0.01 for the aged male vs. control; p < 0.05 for the aged female vs. control); the inner retinal layers were significantly affected by the aging process in the males (p < 0.01) but not in the aged females. Electron microscopy revealed more abnormalities which involve the retinal pigment epithelium (RPE) and Bruch’s membrane, outer and inner layers, vascular changes, deposits of amorphous materials, and accumulation of lipids or lipofuscins. Age-related miRNAs, miR-27a-3p (p < 0.01), miR-27b-3p (p < 0.05), and miR-20a-5p (p < 0.05) were significantly up-regulated in aged male mice compared to the controls, whereas miR-20b-5p was significantly down-regulated in aged male (p < 0.05) and female mice (p < 0.05) compared to the respective controls. miR-27a-3p (5.00 fold; p < 0.01) and miR-27b (7.58 fold; p < 0.01) were significantly up-regulated in aged male mice vs. aged female mice, whereas miR-20b-5p (−2.10 fold; p < 0.05) was significantly down-regulated in aged male mice vs. aged female mice. Interestingly, miR-27a-3p, miR-27b-3p, miR-20a-5p, and miR-20b-5p expressions significantly correlated with the thickness of the retinal PS layer (p < 0.01), retinal outer layers (p < 0.01), and Bruch’s membrane (p < 0.01). Our results showed that biological sex can influence the structure and function of the retina upon aging, suggesting that this difference may be underlined by the dysregulation of age-related mi-RNAs.

Bruch’s membrane pathology: A mechanistic perspective

2020 ◽  
Vol 30 (6) ◽  
pp. 1195-1206 ◽  
Author(s):  
Aishwarya Murali ◽  
Subramanian Krishnakumar ◽  
Anuradha Subramanian ◽  
Sowmya Parameswaran
Keyword(s):  
Extracellular Matrix ◽  
Retinal Pigment Epithelium ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Vital Role ◽  
Age Related Macular Degeneration ◽  
Ocular Diseases ◽  
Bruch's Membrane ◽  
Bruch’S Membrane ◽  
Age Related

Bruch’s membrane, an extracellular matrix located between the retinal pigment epithelium and the choroid, plays a vital role as structural and functional support to the retinal pigment epithelium. Dysfunction of Bruch’s membrane in both age-related macular degeneration and other ocular diseases is caused mostly by extracellular matrix degeneration, deposit formation, and angiogenesis. Although these factors are dealt in greater detail with respect to the cells that are degenerated such as the retinal pigment epithelium and the endothelial cells, the pathology involving the Bruch’s membrane is often underrated. Since in most of the macular degenerations early degenerative changes are also observed in the Bruch’s membrane, addressing only the cellular component without the underlying membrane will not yield an ideal clinical benefit. This review aims to discuss the factors and the mechanisms affecting the integrity of the Bruch’s membrane, which would aid in developing an effective therapy for these pathologies.

scholarly journals Age-related Bruch's membrane change: a clinical study of the relative role of heredity and environment.

1993 ◽  
Vol 77 (7) ◽  
pp. 400-403 ◽  
Author(s):  
B. Piguet ◽  
J. A. Wells ◽  
I. B. Palmvang ◽  
R. Wormald ◽  
I. H. Chisholm ◽  
...  
Keyword(s):  
Clinical Study ◽  
Relative Role ◽  
Bruch's Membrane ◽  
Bruch’S Membrane ◽  
Age Related ◽  
Membrane Change

scholarly journals Symptomatic abnormalities of dark adaptation in patients with age-related Bruch's membrane change.

1993 ◽  
Vol 77 (9) ◽  
pp. 549-554 ◽  
Author(s):  
R L Steinmetz ◽  
R Haimovici ◽  
C Jubb ◽  
F W Fitzke ◽  
A C Bird
Keyword(s):  
Dark Adaptation ◽  
Bruch's Membrane ◽  
Bruch’S Membrane ◽  
Age Related ◽  
Membrane Change
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