RÉSUMÉ
ABSTRACT: Morphology and physiology of bird eyes are similar to mammals; although, there are peculiarities that should be considered for a correct interpretation of an ophthalmic examination. While the ophthalmology of domestic species is already well established, there are gaps to be filled regarding birds, particularly due to the large number of existing species. This literature review consists of a brief contribution regarding peculiarities of anatomy, physiology, and ophthalmic semiotechnique of the avian eye.
RESUMO: A morfologia e a fisiologia dos olhos das aves são similares àquelas de mamíferos, mas existem particularidades que devem ser consideradas para a correta interpretação do exame oftálmico. Enquanto a oftalmologia de espécies domésticas já é bem estabelecida, ainda há diversas lacunas no que tange às aves, particularmente devido ao grande número de espécies existentes. Este trabalho objetiva realizar uma revisão bibliográfica abrangendo anatomia, fisiologia e semiologia oftálmica de aves.
RÉSUMÉ
Objective To investigate the blood-retinal barrier(BRB)function of porcine retinal pigment epithelial(RPE)cells cultured in vitro. Methods Primary porcine RPE cells were cultured,and the third generation were inoculated in a microporous filter with the filter membrane of polyvinylpyrrolidone(PVP)-free polycarbonate membrane.After 1,2,3 and 4 weeks of culture,the surface of filter membrane was observed by light microscope,and after 2 weeks of culture,the section of filter membrane was observed by light microscope and transmission electron microscope.Transepithelial electrical resistance(TER)was detected and the permeability was measured with fluorescein sodium(FS)and horseradish peroxidase(HRP). Results Primary porcine RPE cells were cultured successfully.RPE cells converged1week after inoculation; 2 and 3 weeks after inoculation,the density of RPE cells did not changed obviously; 4 weeks after inoculation,the density of RPE cells decreased.The characteristics of polarized growth of monolayer were found in RPE cells on the surface of filter membrane; 2 weeks after inoculation,the TER of RPE cells was(97.44?11.36)?/cm~2 which maintained till the 3rd week after inocubation.After incubated for 30 minutes,only 0.27% of FS and 0.17% HRP reached the inferior filter membrane,and the permeability rate of SF with low molecular weight was higher than which of HRP with high molecular weight. Conclusions The filter with PVP-free polycarbonate membrane may be used to set up the model of RPE cells with polarized growth of monolayer and investigate the barrier function of RPE cells.
RÉSUMÉ
Objective To describe cultured human retinal pigment epithelial (RPE) cells transdifferentiation and investigate the effects of human vitreous fluid on the morphologic and cytoskeleton changes of RPE cells in vitro. Methods Cytoskeleton characteristics in the 2 nd, 5 th, 8 th passage of RPE cells in normal culture, which included cytokeratin 18 (CK18) and ?-smooth muscle actin (?-SMA) were analyzed by Western blot. RPE cells were cultured in human vitreous-conditioned medium (VCM) at the concentration of 1∶4 for 6 days, morphologic changes were examined by light and electron microscopy, and cytoskeleton characteristics were analyzed by imunocytochemistry and Western blot. Results During culture in vitro, RPE cells lost epithelial characteristics and aquired fibroblast-like phenotype. The expression of CK18 was the highest at the 5 th passage, and it decreased in the following passage, but ?-SMA increased gradually. The morphologic transdifferentiation from epithelial to fibroblast-like cells of RPE was accelerated by VCM. Ultrastructural changes such as decreased microvilli and gradually increased rough endoplasmic reticulum and Golgi complex were found during the cultivation. CK18 produced by RPE cells decreased in VMC (P