Wandering phagocytes at the retinal epithelium-photoreceptor interface in theteleost retina

  title={Wandering phagocytes at the retinal epithelium-photoreceptor interface in theteleost retina},
  author={C. R. Braekevelt},
  journal={Vision Research},
The presence of wandering phagocytes at the retinal epithelium-photoreceptor interface was noted with the electron microscope in five taxonomically very different teleost species. The species investigated were the northern pike (Esox lucius), the mud minnow (Umbra limi), the arctic char (Salvelinus alpinus), the scissortail (Rasbora trilineata) and the giant danio (Danio malabricus). A population of ameboid phagocytes may be a normal characteristic of the retinal epithelium-photoreceptor… Expand
Retinal pigment epithelial fine structure in the velvet cichlid (Astronotus ocellatus)
The morphology of the retinal pigment epithelium, choriocapillaris and Bruch's membrane have been studied by light and electron microscopy in the velvet cichlid and it is thought that the melanosomes are capable of extensive retinomotor movement. Expand
Ultrastructural study of the retinal pigment epithelium during metamorphosis in the sea lamprey (Petromyzon marinus L.)
The sequence of morphological changes in the retinal pigment epithelium during the metamorphic period of the sea lamprey Petromyzon marinus L. has been investigated using electron microscopy and the presence of wandering phagocytes in the retina of lampreys is described for the first time. Expand
Fine structure of the retinal epithelium and retinal tapetum lucidum of the goldeye Hiodon alosoides
The fine structure of the retinal epithelium of the goldeye has been investigated with electron microscopy in both the light- and dark-adapted condition and Circadian changes are noted in the morphology of the myeloid bodies and mitochondria and in the location of the epithelial cell nucleus. Expand
Ultrastructure of the Outer Retina in the Killifish, Aphanius sirhani (Cyprinodontidae, Teleostei)
The ultrastructure of the outer retina in the endangered killifish, Aphanius sirhani was studied. The retina shows all eight layers and two membranes typical of vertebrates. The retinal pigmentExpand
Light dependent accumulation of macrophages at the photoreceptor-pigment epithelial interface in the retina of albino mice
Observations suggest that macrophages appear as a response to visual cell decay in albino mice and supplement the phagocytic activity of the pigment epithelium. Expand
Fine structure of the retinal pigment epithelium of Oreochromis niloticus L. (Cichlidae; Teleostei) in light‐ and dark‐adaptation
A number of unique morphological changes take place within the RPE cells of this species during the circadian cycle in addition to the movement of melanosomes characterized in other vertebrates. Expand
Development of the retinal tapetum lucidum of the walleye (Stizostedion vitreum vitreum).
The development of the retinal tapetum lucidum within the cells of the Retinal pigment epithelium (RPE) has been investigated by both light and electron microscopy in the walleye in specimens ranging in total length from 25-140 mm. Expand
Subretinal macrophages in the developing eye of eutherian mammals and marsupials
Subretinal macrophages are a feature of the developing eye in a broad range of mammalian species and immunophenotypic evidence leads the author to postulate that these cells arise from the ciliary body vasculature and may migrate into peripheral neural retina and mature into resident microglia. Expand
Microglia in the avian retina: Immunocytochemical demonstration in the adult quail
A pattern of microglial distribution was similar to that described in vascular retinae of several species of mammals a finding that suggests that blood vessels are not responsible for the final locations ofmicroglia in the adult retina, and that microglia precursors must migrate through long distances before they reach their precise destination. Expand
Pigment epithelial ensheathment and phagocytosis of rod tips in the retina of Rana catesbeiana
Two modes of shedding of rod disc membranes were observed by electron microscopy in bullfrog retinas illuminated for various periods from 10 min to 2 hr, and it appears that some of the shed disc membranes remain in the subretinal space, and may be phagocytized by ameboid phagocytes. Expand


Photoreceptor Fine Structure in the Northern Pike (Esox lucius)
The morphology of the retinal photoreceptors in the adult northern pike (Esox lucius) is studied by light and electron microscopy. Expand
Fine Structure of the Retinal Pigment Epithelium, Bruch's Membrane, and Choriocapillaris in the Northern Pike (Esox lucius)
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 pigmentExpand
Phagocytosis in the light-damaged albino rat eye: light and electron microscopic study.
Retinal photoreceptor degeneration was induced by exposing albino rats to fluorescent illumination at elevated environmental temperatures and the resulting pattern of invasion, migration, and egression of carbon-filled phagocytes in eyes with degenerated retinas was reconstructed from a time sequence series of light and electron microscopic tissue sections. Expand
The disposal phase of the retinal rod outer segment renewal process has been studied by radioautography in adult frogs injected with tritiated amino acids to identify inclusions within the pigment epithelium by virtue of their content of radioactivity. Expand
Photic maculopathy in rhesus monkey. A light and electron microscopic study.
  • M. Tso
  • Chemistry, Medicine
  • Investigative ophthalmology
  • 1973
It is demonstrated that the photoreceptor cells can regenerate their outer segments and provided an explanation for the observation that patients with solar retinitis can show gradual but remarkable recovery. Expand
Early cellular disruption and phagocytosis in photically-induced retinal degeneration.
Albino rats kept at normal body and room temperature develop a progressive retinal degeneration when exposed to ordinary animal room intensities of fluorescent light, which causes extensive retinal damage when animals were removed from continuous light and placed into cyclic lighting. Expand
Rhythmic daily shedding of outer-segment membranes by visual cells in the goldfish
Goldfish were placed on a daily light cycle of 12 h light and 12 h darkness for 18 days or longer to show evidence that this daily rhythm of membrane disposal in rods and cones is a general property of vertebrate visual cells. Expand
The renewal of protein in retinal rods and cones has been analyzed by quantitative electron microscope radioautography in adult frogs injected with a mixture of radioactive amino acids and appears to involve the utilization of protein formed in the ergastoplasm of the myoid. Expand
The photoreceptors of diurnal squirrels: outer segment structure, disc shedding, and protein renewal.
C cone as well as rod outer segments may assemble and shed discs in the mature animal and the shedding process appeared to be qualitatively similar in rods and cones. Expand
Shedding of discs from rod outer segments in the rhesus monkey.
  • R. W. Young
  • Biology, Medicine
  • Journal of ultrastructure research
  • 1971
Renewal of the photosensitive outer segment of rod visual cells involves the continued assembly of new membranous discs accompanied by a balanced loss and destruction of old disc material. TheExpand