Lamellar to tubular conformational changes in the endoplasmic reticulum of the retinal pigment epithelium of the newt, Notophthalmus viridescens

1985 ◽  
Vol 241 (3) ◽  
Author(s):  
MarcA. Yorke ◽  
D.Howard Dickson
Keyword(s):  
Endoplasmic Reticulum ◽  
Retinal Pigment Epithelium ◽  
Conformational Changes ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Notophthalmus Viridescens

Fine Structure of the Retinal Pigment Epithelium, Bruch's Membrane, and Choriocapillaris in the Northern Pike (Esox lucius)

1974 ◽  
Vol 31 (10) ◽  
pp. 1601-1605 ◽  
Author(s):  
C. R. Braekevelt
Keyword(s):  
Endoplasmic Reticulum ◽  
Fine Structure ◽  
Retinal Pigment Epithelium ◽  
Epithelial Cell ◽  
Basal Lamina ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Northern Pike ◽  
Bruch's Membrane ◽  
Bruch’S Membrane

The fine structure of the retinal pigment epithelium, Bruch's membrane, and the choriocapillaris has been studied by light and electron microscopy in the adult northern pike (Esox lucius).The pigment epithelium is composed of a single layer of large cells. Each epithelial cell has abundant mitochondria, smooth endoplasmic reticulum, myeloid bodies, phagosomes, and pigment granules. Rough endoplasmic reticulum and ribosomes are scarce.The scleral or basal border of the epithelial cell is not infolded whereas the vitreal or apical surface displays numerous, fine, elongated processes which surround the inner and outer segments of the photoreceptors.Bruch's membrane is composed of three layers. The innermost layer is the basal lamina of the pigment epithelium. The outermost layer is the basal lamina of the choriocapillaris endothelium. Between these basal laminae is a layer of fine fibrils. The overall thickness of Bruch's membrane is 3.5–4 μ posteriorly.The endothelial wall of the choriocapillaris bordering Bruch's membrane is typically very thin but nonfenestrated. Vesicles are common in the endothelial cytoplasm.This region of the pike eye differs morphologically from that described for most other vertebrates.

Fine structure of the retinal epithelium, Bruch's membrane, and choriocapillaris of the pigeon (Columba livia)

1989 ◽  
Vol 67 (4) ◽  
pp. 795-800 ◽  
Author(s):  
C. R. Braekevelt
Keyword(s):  
Endoplasmic Reticulum ◽  
Fine Structure ◽  
Retinal Pigment Epithelium ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Columba Livia ◽  
Bruch's Membrane ◽  
Bruch’S Membrane ◽  
Apical Process ◽  
Retinal Epithelium

As part of a comparative morphological study, the fine structure of the retinal pigment epithelium, the choriocapillaris, and Bruch's membrane (complexus basalis) has been studied by light and electron microscopy in the pigeon (Columba livia). In this species the retinal pigment epithelium consists of a single layer of cuboidal cells, which show numerous very deep basal (scleral) infoldings and extensive apical (vitreal) processes enclosing photoreceptor outer segments. These epithelial cells are joined laterally by prominent basally located tight junctions. Internally, smooth endoplasmic reticulum is the most abundant cell organelle with only small amounts of rough endoplasmic reticulum present. Polysomes are abundant as are mitochondria, which often display a ring-shaped structure. The cell nucleus is large and vesicular. Melanosomes are plentiful in both the apical region of the cell body and within the apical process in the light-adapted condition. Myeloid bodies are large and numerous and very often have ribosomes on their outer border. Bruch's membrane shows a pentalaminate structure but with only a poorly represented central elastic lamina. Profiles of the choriocapillaris are relatively small and not overly abundant. The endothelium of the choriocapillaris, while extremely thin facing the retinal epithelium, is but minimally fenestrated.

scholarly journals Involvement of Endoplasmic Reticulum Stress in All-Trans-Retinal-Induced Retinal Pigment Epithelium Degeneration

2014 ◽  
Vol 143 (1) ◽  
pp. 196-208 ◽  
Author(s):  
Jie Li ◽  
Xianhui Cai ◽  
Qingqing Xia ◽  
Ke Yao ◽  
Jingmeng Chen ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Retinal Pigment Epithelium ◽  
Endoplasmic Reticulum Stress ◽  
Pigment Epithelium ◽  
Retinal Pigment

Ultrastructural Changes of Smoooth Endoplasmic Reticulum in the Retinal Pigment Epithelium by Choline Chloride

1972 ◽  
Vol 30 ◽  
pp. 58-59
Author(s):  
Kazushige Hirosawa ◽  
Eichi Yamada
Keyword(s):  
Endoplasmic Reticulum ◽  
Epithelial Cell ◽  
Smooth Endoplasmic Reticulum ◽  
Pigment Epithelium ◽  
Choline Chloride ◽  
Retinal Pigment ◽  
Ultrastructural Changes ◽  
Lower Vertebrate ◽  
Visual Cells ◽  
Pigment Epithelial

The pigment epithelium is located between the choriocapillary and the visual cells. The pigment epithelial cell is characterized by a large amount of the smooth endoplasmic reticulum (SER) in its cytoplasm. In addition, the pigment epithelial cell of some lower vertebrate has myeloid body as a specialized form of the SER. Generally, SER is supposed to work in the lipid metabolism. However, the functions of abundant SER and myeloid body in the pigment epithelial cell are still in question. This paper reports an attempt, to depict the functions of these organelles in the frog retina by administering one of phospholipid precursors.

Sign in / Sign up

Export Citation Format

Share Document