Orientador: José Luiz Laus / Banca: Auero Evangelista Santana / Banca: Thiago Luiz de Salles Gomes / Resumo: Avaliaram-se descritivamente, à clínica, à histopatologia e à imunoistoquímica (ki 67- marcador de proliferação celular) os resultados, da cicatrização da córnea, após ceratoplastias lamelares com membrana de celulose microfibrilar em coelhos. Para tal, utilizaram-se 30 coelhos , distribuídos em 5 grupos de 6 animais, avaliados por até 60 dias de pós operatório. A avaliação clínica revelou manifestações moderadas de edema, blefaroespasmos, fotofobia desde o segundo dia, evoluindo para formas discretas ou ausentes a partir do sétimo dia, onde observou-se clinicamente o reparo do defeito da córnea. A histopatologia revelou uma fina camada de células escamosas, recobrindo totalmente a área lesada, aos sete dias, e com leve infiltrado de células polimorfonucleares. Observou-se a presença de vasos no epitélio a partir do 15º dia , com regressão aos 48º dias .A imunoistoquímica mostrou aumento de células em proliferação aos 15 dias no epitélio (p= 0,049) e aos trinta dias no estroma (p= 0,042). Frente aos resultados obtidos, há como admitir que mesmo com o defeito corneal concluído, aos sete dias, o sistema de defesa celular ainda se manteve ativo, pois a proliferação celular no epitélio se mostrou mais intensa aos 15 dias de observação ,conforme demonstrado imunoistoquimicamente. Onde nesse período ocorreu remodelamento e adesão epitelial da córnea, características satisfatórias em ceratoplastia lamelar em coelhos . / Abstract: Were evaluated the clinic, the histopathology and immunohistochemistry (ki 67 - marker of cell proliferation), the results of the membrane of cellulose in lamellar keratoplasty in rabbits. To this end, 30 rabbits were used, divided into 5 groups of 6 animals, assessed by up to 60 days of post-operative. The assessment showed clinical manifestations of moderate swelling, blefarospasmos, photophobia since the second day, evolving into discrete forms or absent from the seventh day, where there was clinically repair the defect of the cornea. The histopathology revealed a thin layer of squamous cells, completely covering the injured area, the seven days, and with mild infiltration of polymorphonuclear cells. There was the presence of vessels in the epithelium from the 15 th day, with regression of days to 48. Immunohistochemistry showed increased cell proliferation in the 15 days in the epithelium (p = 0049) and the thirty days in the stroma (p = 0042) . Facing the results achieved, as there admit that even with the beginning of healing, and with the defect of the cornea closed to seven days, the system of defence cell remained active, as in the epithelial cell proliferation was more intense at 15 days, as shown imunoistochemistry. Where in that period showed epithelial remodeling and membership, characteristics satisfactory in lamellar keratoplasty in rabbits. / Mestre

Made available in DSpace on 2014-06-11T19:23:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-06-24Bitstream added on 2014-06-13T19:09:50Z : No. of bitstreams: 1 macedo_lr_me_jabo.pdf: 704711 bytes, checksum: 5b7cb390daed7f40913d5a7cfd9176c2 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Avaliaram-se descritivamente, à clínica, à histopatologia e à imunoistoquímica (ki 67- marcador de proliferação celular) os resultados, da cicatrização da córnea, após ceratoplastias lamelares com membrana de celulose microfibrilar em coelhos. Para tal, utilizaram-se 30 coelhos , distribuídos em 5 grupos de 6 animais, avaliados por até 60 dias de pós operatório. A avaliação clínica revelou manifestações moderadas de edema, blefaroespasmos, fotofobia desde o segundo dia, evoluindo para formas discretas ou ausentes a partir do sétimo dia, onde observou-se clinicamente o reparo do defeito da córnea. A histopatologia revelou uma fina camada de células escamosas, recobrindo totalmente a área lesada, aos sete dias, e com leve infiltrado de células polimorfonucleares. Observou-se a presença de vasos no epitélio a partir do 15º dia , com regressão aos 48º dias .A imunoistoquímica mostrou aumento de células em proliferação aos 15 dias no epitélio (p= 0,049) e aos trinta dias no estroma (p= 0,042). Frente aos resultados obtidos, há como admitir que mesmo com o defeito corneal concluído, aos sete dias, o sistema de defesa celular ainda se manteve ativo, pois a proliferação celular no epitélio se mostrou mais intensa aos 15 dias de observação ,conforme demonstrado imunoistoquimicamente. Onde nesse período ocorreu remodelamento e adesão epitelial da córnea, características satisfatórias em ceratoplastia lamelar em coelhos . / Were evaluated the clinic, the histopathology and immunohistochemistry (ki 67 - marker of cell proliferation), the results of the membrane of cellulose in lamellar keratoplasty in rabbits. To this end, 30 rabbits were used, divided into 5 groups of 6 animals, assessed by up to 60 days of post-operative. The assessment showed clinical manifestations of moderate swelling, blefarospasmos, photophobia since the second day, evolving into discrete forms or absent from the seventh day, where there was clinically repair the defect of the cornea. The histopathology revealed a thin layer of squamous cells, completely covering the injured area, the seven days, and with mild infiltration of polymorphonuclear cells. There was the presence of vessels in the epithelium from the 15 th day, with regression of days to 48. Immunohistochemistry showed increased cell proliferation in the 15 days in the epithelium (p = 0049) and the thirty days in the stroma (p = 0042) . Facing the results achieved, as there admit that even with the beginning of healing, and with the defect of the cornea closed to seven days, the system of defence cell remained active, as in the epithelial cell proliferation was more intense at 15 days, as shown imunoistochemistry. Where in that period showed epithelial remodeling and membership, characteristics satisfactory in lamellar keratoplasty in rabbits.

Introduction: Recent advances in posterior lamellar keratoplasty necessitated the preparation of posterior corneal lamellae even in the Czech Republic. The aim of this work was to introduce and standardize a novel method of manual preparation of corneal lamellae for Descemet Membrane Endothelial Keratoplasty with a Stromal rim (DMEK-S) in an ocular tissue bank. After setting the criteria for endothelial quality, we obtained a licence to provide the tissues for transplantation purposes. The obtained results were analysed after two years. Furthermore, a novel lamellar insertion technique using a cartridge was assessed. The potentials for the long-term storage of posterior corneal lamellae by the vitrification in liquid ethane was studied using human amniotic membrane as a model tissue. Material and Methods: Corneoscleral buttons stored in tissue cultures were used to prepare lamellae consisting of a central zone of endothelium and Descemet membrane supported by a stromal rim at the periphery. The manual preparation was performed on an artificial anterior chamber using the big bubble technique. Endothelial quality was assessed before storage, before and immediately after preparation as well as after 2 days of storage at 31řC. A group of 12 corneas with a live endothelial cell density ≥ 2500 cells/mm2...