Impacto de drogas antiplaquetárias na doença e no reparo periodontal experimental em ratos

• Ano de defesa: 2013
• Autor(a) principal: Coimbra, Leila Santana [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Periodonto; Plaquetas (Sangue); Aspirina; Doenças periodontais; Periodontium
• Link de acesso: http://hdl.handle.net/11449/108404

Platelets are a natural reservoir of several biological mediators and once activated, express growth factors, pro- and anti-angiogenic factors, chemokines and monoamines modulating the activation and maintenance of the inflammatory and repair process. The aim of this study was to evaluate the impact of antiplatelet drugs, aspirin (Asp) and clopidogrel (Clop) on periodontal disease and the repair of periodontal tissues after induction of experimental periodontitis in rats. For the evaluation of the inflammatory process, microscopic evaluation, analysis of the expression of the chemokines CXCL4 and CCL5 by ELISA and myeloperoxidase activity (MPO) were realized. To evaluate periodontal tissue repair we performed microscopic examination, analysis of the expression of CXCL12, CXCL4, CCL5 and PDGF by ELISA, and blood vessels and osteoclast count by immunohistochemistry. Also, characterization of undifferentiated mesenchymal stem cells by immunohistochemical staining for CD 271 (stem cell marker) and immunofluorescence double labeling using CD 271 associated with CD45, Ki67 and TUNEL were realized. Undifferentiated mesenchymal stem cells derived from human bone marrow were used for in vitro evaluation of cell proliferation by immunocitofluorescence. Three days after ligature placement, we found that treatment with antiplatelet drugs abbreviated the inflammatory process observed by the microscopic analysis, reduction of myeloperoxidase activity (p <0.001) and decreased the expression of CXCL4 (p <0.05), but treatment with Clop more pronounced than Asp. After removal of the ligature, Clop treatment accelerated the repair process by significantly reducing the expression of CXCL12, CXCL4, PDGF number of blood vessels and osteoclasts, on the other hand, treatment with Asp only showed significant effects in reducing the expression of CXCL12 and CXCL4. In turn, Clop treatment increased the number of osteoblasts...