Papel das proteínas Nod na modulação da resposta imune nas doenças priodontais

• Ano de defesa: 2013
• Autor(a) principal: Souza, João Antonio Chaves de [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Doenças periodontais; Reabsorção óssea; Inflamação; Bone resorption
• Link de acesso: http://hdl.handle.net/11449/108452

Recognition of pathogenic bacteria by the host is initially mediated by the innate immune response through detection of microbe-associated molecular pattern (MAMPs) by Toll-like receptors (TLR) and Nucleotide-oligomerization domain (Nod) proteins. Since the oral cavity, as well as other mucosal surfaces, is continuously colonized with non-pathogenic bacteria that also present MAMPs, there has to be an endogenous negative regulatory mechanism in place to prevent an overt host response with deleterious consequences. Specifically in the oral mucosa, it is not clear how the immune system is able to quickly distinguish between commensal and pathogenic bacteria and tailor the host response. Nod proteins were initially described as ‘intracellular TLRs’ that recognize MAMPs associated with bacteria invading the cytosol; however these proteins have been shown to modulate the activation of various signaling pathways involved in the expression of inflammatory genes, including p38 MAPK and NF-κB in concert with TLR stimulation. There is paucity of information on the in vivo role of Nod proteins in the modulation of host-microbe interactions in the oral mucosa. Based on this information, our hypothesis is that Nod proteins play an important role in the modulation of the inflammatory reaction associated with periodontal diseases and its consequences, including alveolar bone resorption. To test this hypothesis, we propose the following specific aims: Assess the role of Nod proteins in the inflammation and bone resorption in experimentally-induced periodontal disease Describe the influence of Nod proteins on the cytokine and signaling networks associated with periodontal disease.