Ultrastructure of the retinal pigmented epithelium of light- and dark-adapted young, pigmented, and mature silver eels, Anguilla anguilla (Pisces, Teleostei)

Zoomorphology ◽  
1986 ◽  
Vol 106 (3) ◽  
pp. 179-184 ◽  
Author(s):  
A. Es-Sounni ◽  
M. A. Ali
Keyword(s):  
Anguilla Anguilla ◽  
Retinal Pigmented Epithelium ◽  
Silver Eels ◽  
Pigmented Epithelium

scholarly journals EFFECTS OF CYCLIC AMP AND SEPHADEX FRACTIONS OF CHICK EMBRYO EXTRACT ON CLONED RETINAL PIGMENTED EPITHELIUM IN TISSUE CULTURE

1974 ◽  
Vol 61 (2) ◽  
pp. 369-382 ◽  
Author(s):  
D. A. Newsome ◽  
R. T. Fletcher ◽  
W. G. Robison ◽  
K. R. Kenyon ◽  
G. J. Chader
Keyword(s):  
Molecular Weight ◽  
Chick Embryo ◽  
Adenosine Monophosphate ◽  
Cell Number ◽  
Retinal Pigmented Epithelium ◽  
Culture Dish ◽  
Adhesive Properties ◽  
Embryo Extract ◽  
Chick Embryo Extract ◽  
Pigmented Epithelium

The effects of dibutyryl cyclic 3',5'-adenosine monophosphate (BcAMP) and Sephadex G-25 fractions of chick embryo extract on the growth rate, morphology, and pigmentation of normal chick retinal pigmented epithelium (PE) were investigated. Seven cloned PE cell lines were each grown in modified Ham's F-12 medium alone (F-12), or in F-12 supplemented with either high molecular weight (H) or low molecular weight (L) fractions of chick embryo extract. Cells grown in F-12 alone or in L medium formed compact epithelial sheets, whereas cells grown in H had a fibrocytic appearance and formed poorly organized monolayers. In H plus BcAMP, cell morphology was more epithelioid than in H alone, and generally the monolayers appeared more differentiated. Under each of these three culture conditions, 2 x 10-4 M BCAMP retarded the increase in cell number and decreased the final number of cells per culture dish, but had little effect on plating efficiency. BcAMP also increased the rate of cell adhesion to a plastic substratum. Pigmentation was marked in cultures grown in F-12 or in L alone, but the addition of BcAMP dramatically reduced visible pigmentation. This effect was reversed when BcAMP was removed from the culture medium. Thus BcAMP modifies cell and colonial morphology, rate of cell accumulation, adhesive properties, and pigmentation of normal PE cells.

scholarly journals Five Recombinant Simian Immunodeficiency Virus Pseudotypes Lead to Exclusive Transduction of Retinal Pigmented Epithelium in Rat

2002 ◽  
Vol 6 (4) ◽  
pp. 446-454 ◽  
Author(s):  
Ghislaine Duisit ◽  
Hervé Conrath ◽  
Sylvie Saleun ◽  
Sebastien Folliot ◽  
Nathalie Provost ◽  
...  
Keyword(s):  
Simian Immunodeficiency Virus ◽  
Retinal Pigmented Epithelium ◽  
Immunodeficiency Virus ◽  
Pigmented Epithelium

AGEs Promote Oxidative Stress and Induce Apoptosis in Retinal Pigmented Epithelium Cells RAGE-dependently

2015 ◽  
Vol 56 (2) ◽  
pp. 449-460 ◽  
Author(s):  
Xin-Ling Wang ◽  
Tao Yu ◽  
Qi-Chang Yan ◽  
Wei Wang ◽  
Nan Meng ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Retinal Pigmented Epithelium ◽  
Pigmented Epithelium ◽  
Epithelium Cells

scholarly journals Reprogramming of the chick retinal pigmented epithelium after retinal injury

BMC Biology ◽  
2014 ◽  
Vol 12 (1) ◽  
pp. 28 ◽  
Author(s):  
Agustin Luz-Madrigal ◽  
Erika Grajales-Esquivel ◽  
Alexander McCorkle ◽  
Ashley M DiLorenzo ◽  
Karla Barbosa-Sabanero ◽  
...  
Keyword(s):  
Retinal Pigmented Epithelium ◽  
Retinal Injury ◽  
Pigmented Epithelium

scholarly journals Growth potential can affect timing of maturity in a long-lived semelparous fish

2018 ◽  
Vol 14 (7) ◽  
pp. 20180269 ◽  
Author(s):  
Kazuki Yokouchi ◽  
Françoise Daverat ◽  
Michael J. Miller ◽  
Nobuto Fukuda ◽  
Ryusuke Sudo ◽  
...  
Keyword(s):  
Anguilla Anguilla ◽  
Growth Conditions ◽  
Growth Potential ◽  
Individual Growth ◽  
Growth Trajectories ◽  
Female Size ◽  
European Eel ◽  
Growth And Survival ◽  
Silver Eels ◽  
Reproduction Cost

Many diadromous fishes such as salmon and eels that move between freshwater and the ocean have evolved semelparous reproductive strategies, but both groups display considerable plasticity in characteristics. Factors such as population density and growth, predation risk or reproduction cost have been found to influence timing of maturation. We investigated the relationship between female size at maturity and individual growth trajectories of the long-lived semelparous European eel, Anguilla anguilla . A Bayesian model was applied to 338 individual growth trajectories of maturing migration-stage female silver eels from France, Ireland, the Netherlands and Hungary. The results clearly showed that when growth rates declined, the onset of maturation was triggered, and the eels left their growth habitats and migrated to the spawning area. Therefore, female eels tended to attain larger body size when the growth conditions were good enough to risk spending extra time in their growth habitats. This flexible maturation strategy is likely related to the ability to use diverse habitats with widely ranging growth and survival potentials in the catadromous life-history across its wide species range.

Melanogenesis in amphibians

Development ◽  
1970 ◽  
Vol 24 (2) ◽  
pp. 447-454
Author(s):  
John J. Eppig
Keyword(s):  
Electron Microscopy ◽  
Epithelial Cells ◽  
Notophthalmus Viridescens ◽  
Retinal Pigmented Epithelium ◽  
Pigmented Epithelium ◽  
In Cells

Electron microscopy of 11-day-old Notophthalmus viridescens retinal pigmented epithelium reveals particulate premelanosomes which are identical to the melanosomes found in the oocyte. These organelles, when found in the pigmented epithelium, are called premelanosomes because they undergo further maturation to form relatively homogeneous, spherical melanosomes. At this stage, oocyte melanosomes found in cells other than melanocytes have not undergone this subsequent maturation. Elongated melanosomes which develop from fibrillar premelanosomes are also found in the pigmented epithelial cells. Treatment with phenylthiourea blocks the maturation of both the fibrillar and particulate premelanosomes.

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