No abstract available.

No abstract available.

This study was undertaken in an attempt to localize fibronectin and collagen type IV to the cultured retinal pigment epithelial cell by means of immunofluorescent staining and immunocytochemrcal method. Immunofluorescent staining and immunocytochemical methcds revealed fibronectin and collagen type IV localized on the extracellular membrane of the cultured retinal pigment epithelial cell. Ultrastructural immunocytochemical technique also revealed fibronectin associated with extracellular tissue. This study demonstrated that fibronectin and collagen type IV are an integral component of the extracellular matrix of the retinal pigment epithelial cell in vitro.
Collagen Type IV ; Epithelial Cells* ; Extracellular Matrix* ; Fibronectins ; Membranes ; Retinaldehyde*

This study was performed to observe the sequential charge of the morpholcgic characteristics in experimentally induced herpes simplex keratitis. Duration and morphology of corneal lesion following infection of rabbit cornea with the Kos strain of HSV-I were followed by a daily slit-lamp examination. Three types of virus inoculation methods were used such as scratching, deepithelialization, and intrastromal injection. Herpetic corneal lesions appeared 24 hours after inoculation with punctate and dendritic figures. They persisted up to 14 or 15 days. The characteristic finding in punctate herpetic keratitis was grouped, round-shaped, punctate lesion. When scratching method was emplyed, the most remarkable finding was the discontinuity of the lesion occurred along the scratching wound at relatively regular intervals. There was no difference in lesional morphology and duration between three inoculation methods.
Cornea ; Keratitis* ; Keratitis, Herpetic ; Wounds and Injuries

This study was performed to investigate the sequential changes of the retinal tissue in tissue culture condition. The human sensory retinal tissues were cultured for up to 2 weeks and 4 weeks, respectively. The initial changes showed the separation of the intercellular space and the consequent widening of the intercellular space with prolapse of cytoplasmic processes into the widened intercellular space. The internal limiting membrane was also separated from the inner retina, which led to the prolapse of the cytoplasm of the Muller cell. The growth of the Muller cell was most prominent during the 4-weeks' tissue culture period. These findings suggest that the Muller cell might contribute to the formation of cellular membrane in case of the defect of the internal limiting membrane in several pathologic conditions.
Adult ; Cell Membrane/ultrastructure ; Cells, Cultured ; Humans ; Male ; Middle Aged ; Neuroglia/*ultrastructure ; Retina/*ultrastructure

PURPOSE: To evaluate the morphological characteristics of the transitional zone between the corneal endothelium and the trabecular meshwork by flat preparation and electron microscopy. METHODS: The materials comprised 12 eyes examined by the flat preparation and 7 eyes by the electron microscopy. The specimens were derived from the transitional tissue between the corneal endothelium and the trabecular meshwork. The specimens in the flat preparation were stained with hematoxylin-eosin and examined by light microscopy. The specimens for scanning electronic microscopy (SEM) and in transmission electronic microscopy (TEM) were examined through routine processes. RESULTS: In the specimens examined by the flat preparation, unlike peripheral corneal endothelial cells, the endothelial cell nuclei in the transitional zone were overlapped and morphologically oval. On SEM, unlike typical hexagonality and tight interdigitation of corneal endothelial cells, the endothelial cells in the transitional zone were partially successive, spaced intercellularly, and morphologically irregular. On TEM, the endothelial cells in the transitional zone were partially successive. CONCLUSIONS: The loss of cell-cell contact of endothelial cells in the transitional zone may lead to the potential proliferation capacity of endothelial cells in the transitional zone under specific conditions. Therefore, further studies on the proliferation capacity of endothelial cells in the transitional zone are needed together with more research on cell biology.
Endothelial Cells ; Endothelium, Corneal* ; Microscopy ; Microscopy, Electron ; Trabecular Meshwork

The linear scratching wound was made gently on the corneal epithelium of rabbit with 21 gauge needle under an operating microscope. Impression cytology was performed at 30 minutes, 1, 2, 3 and 4 hour and 1, 2, 3 and 4 day after 0.5% tetracaine drops under an operating microscope. The filter paper was stained with hematoxylin and eosin. At 30 minute post-scratching, a few polymorphonuclear leukocytes appeared on the scratched cornea at 3 eyes (30%). At 3 and 4 hour, numerous polymorphonuclear leukocytes with corneal epithelial cells appeared on the scratched conea. By 3 day, no inflammatory cells were shown on the filter paper in all eyes. These findings suggest that the polymorphonuclear leukocytes could infiltrate on the corneal lesion at 30 minute post-scratching and the inflammatory cells might act even on the minute corneal lesion such as corneal erosion.
Cornea ; Eosine Yellowish-(YS) ; Epithelial Cells ; Epithelium, Corneal ; Hematoxylin ; Needles ; Neutrophils* ; Tetracaine ; Wounds and Injuries*

Fluorouracil Was effective in controlling the in vitro cellular proliferation. When given with cultured human retinal pigment epithelial cell, fluoroirracil decreased the cellular activity of the cultured retinal pigment epithelial cell. The attachment and migratien of the cultured retinal pigment epithelial cell was markedly reduced after repeated treatment with fluorouracil. Electron micrographs of the cultured retinal pigment epithelial cell given with fluorouracil showed marked reduction of cytoplasmic pseudopodia, rupture of plasma membrane, loss of microorganelles and eventual cytolysis. Based on these data, low dose fluorouracil may be an effective inhibitor of the in vitro proliferation of the retinal pigment epithelium.
Cell Membrane ; Cell Proliferation ; Cytoplasm ; Epithelial Cells ; Fluorouracil ; Humans ; Pseudopodia ; Retinal Pigment Epithelium* ; Retinaldehyde* ; Rupture

The cultured cells were derived from rabbit corneal stroma by explant technique following microdissection and serial passage. The ultrastructural features of fourteenth-passage keratocytes were examined with both scanning and transmission electron microscope. The cells can be divided into activated, intermediate and old cell according to the differences in electron density and surface microvillous pattern. The morphologic characteristics of the cultured keratocytes partially resemble those shown in corneal keratocytes in vivo.
Cells, Cultured ; Corneal Keratocytes* ; Corneal Stroma ; Microdissection ; Serial Passage

Type VII collagen is one of the major structural components of the corneal epithelial adhesion complex. Using the immunogold technique combined with indirect immunofluorescence analysis, the fine structural distribution of type VII collagen was studied in the corneas obtained from 5 enucleated hyman eyes (age range, 1-77 years) including one pathologic cornea from graft rejection. The findings on normal cornea corroborated the results from previous studies. In pathologic cornea from graft rejection, type VII collagen antibodies generated linear and irregular patchy fluorescence staining along the epithelial-stromal interface and immunogold binding to type VII collagen mainly occurred within the undulating lamina densa, more densealy distributed anchoring plaques and anchoring fibrils. The distribution of type VII collagen in pathologic human cornea from graft rejection is similar to normal human cornea. But, in pathologic cornea, type VII collagen is more densely distributed in superficial stroma and forms more extended anchoring network, which may be derived from the increased secretion of the type VII collagen due to the activated basal epithelial cell during healing process.
Antibodies ; Collagen Type VII* ; Cornea* ; Epithelial Cells ; Fluorescence ; Fluorescent Antibody Technique, Indirect ; Graft Rejection ; Humans ; Immunohistochemistry