ABSTRACT
OBJECTIVES/HYPOTHESIS: The aim of this study has been to establish an alternative approach in the form of regeneration of the thyroid cartilage. STUDY DESIGN: Four 1-month old pigs (Sus scrofa) were used (divided into 3 groups) and submitted to general anesthetic to perform cervictomy with exposure of the thyroid cartilage in a total of 12 (twelve) samples. METHOD: A resection of 4.0 cm(2) of cartilage was carried out in the right upper region and in the left upper and lower left region of the cartilage, where a scaffold with or without stem cells was implanted. In the left lower region, no biomaterial was implanted and the defect was left open (lesion control [L]). RESULTS: The average extension of the cartilaginous neoformation of L group was 136.3 µm (± 9.6) and 387.7 µm (± 43.2) in the scaffold (SCA) group, presenting a significant statistical difference (P < 0.01). The analysis carried out on the lesion site sections of the cartilage of the larynx of the animals from the SCA group + mesenchymal stem cells (SCA+MSC) showed an average of the extension of neocartilage of 825.4 µm (± 122.1), showing a more extensive area of neocartilage when compared to the other groups. These results demonstrated a high significantly statistical difference (P < 0.001) when compared with the L and SCA groups. CONCLUSION: In 100% of the cases for which SCA+MSCs were used, a significant success in the cartilage growth and closing of the lesion in the thyroid cartilage was obtained compared to the other two groups for which MSCs were not used. LEVEL OF EVIDENCE: N/A.
Subject(s)
Cartilage, Articular/surgery , Mesenchymal Stem Cells/cytology , Nanofibers , Tissue Engineering/methods , Tissue Scaffolds , Animals , Disease Models, Animal , SwineABSTRACT
Scrapie é uma encefalopatia espongiforme transmissível (EET) que causa lesões cerebrais degenerativas em ovinos e caprinos. Caracteriza-se pelo acúmulo, no tecido encefálico e linforreticular, da forma anormal da proteína priônica (PrP Sc) que provoca a morte maciça de neurônios e células gliais, além de vacuolização intensa no tecido afetado. Esse trabalho descreve a utilização da técnica de imuno-histoquímica (IHQ) para proteína priônica em tecido linforreticular de biópsias de terceira pálpebra e mucosa retal, como método diagnóstico de scrapie em ovinos. Realizaram-se exames de IHQ para scrapie em amostras de uma propriedade de origem de um ovino com diagnóstico dessa enfermidade. Utilizaram-se anticorpos monoclonais antipríon para diagnóstico ante mortem pela técnica de IHQ. Nas 318 amostras de biópsias analisadas, encontrou-se 19 resultados positivos para PrP Sc nos folículos de terceira pálpebra e não foi obtida marcação no tecido linfático de mucosa retal em nenhuma das amostras coletadas. Realizaram-se 18 necropsias dos animais positivos anteriormente por biópsia e 21 necropsias de ovinos parentes dos positivos de scrapie. Confirmou-se o resultado de scrapie pela IHQ após a necropsia dos animais positivos nas biópsias de terceira pálpebra. Nesses animais, os órgãos com maior número de cortes positivos foram a terceira pálpebra (18/18) e a tonsila (8/18). Nos ovinos com parentesco com os positivos, nenhum resultado de scrapie ocorreu. A utilização de tecidos linfoides no diagnóstico de scrapie por IHQ através de biópsias mostrou-se um método viável e eficaz para o diagnóstico pré-clínico.
Scrapie, a form of transmissible spongiform encephalopathy (TSEs) is a fatal neurodegenerative disorder that affects sheep and goats. The disease is characterized by an accumulation of the abnormal prionic protein (PrP Sc) in the encephalic and lymphoreticular tissues. This paper describes the use of anti-prionic protein immunohistochemical (IHC) procedure as a method of pre-clinical diagnosis of scrapie.The test was carried out in biopsied lymphoreticular tissues from third eyelid and rectal mucosa. Anti-prion protein monoclonal antibodies F89/160.1.5 and F99/97.6.1 were used. Scrapie diagnosis in lymphoreticular tissues through IHC was achieved when the samples had a minimum of three lymphoid follicles in well delimited germinal centre. Positive immunostaining was identified in 19 out of 318 samples of the third eyelid. Material sampled at post-mortem examination in 18 of these scrapie-positive sheep, which were previously verified by biopsy, and in 21 of its relatives, was confirmed with IHC tests. Positive immunostaining from rectal mucosa tissue was not observed. Third eyelid and tonsil were the organs with the larger amount of positive immunostaining (18/18 and 8/18 respectively) at post-mortem examination. None positive result was obtained along the 21 animals related to the positive ones, and none of the positive cases showed IHC labeling in the brain. The use of lymphoid tissues for scrapie diagnosis by IHC through biopsies showed to be a viable and efficient method for pre-clinical diagnostic.
