A proteína de ligação do vírus sincicial respiratório inibe citocinas inflamatórias da resposta imune em um modelo de sepse induzido por lipopolissacarídeos

• Autor(a) principal: Brum, Charles Ornelas
• Data de Publicação: 2012
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da PUC_RS
• Texto Completo: http://tede2.pucrs.br/tede2/handle/tede/1386
• topic: MEDICINA; PEDIATRIA; CITOCINAS; PROTEÍNAS DE LIGAÇÃO A GTP; POLISSACARÍDEOS; SEPSE; CNPQ::CIENCIAS DA SAUDE::MEDICINA

Sepsis is a systemic inflammatory disorder, and its progression to septic shock is a serious clinical problem associated with a high mortality rate. Despite significant advances in critical care, treatments do not reverse the systemic inflammatory response and its consequences. Gram-negative sepsis is initiated by exposure to a component of gram-negative bacterial membrane, lipopolysaccharide (LPS), and induces overproduction of host inflammatory cytokines, including tumor necrosis factor (TNF- α), interleukin-1 (IL-1) and interleukin-6 (IL-6) from immunocytes such as monocytes. Recent studies have shown that similar to LPS, the Respiratory syncytial virus - leading cause of severe lower respiratory tract infections in infants and young children requires the toll-like receptor 4 (TLR4) for signaling. Studies have shown that the respiratory syncytial virus attachment glycoprotein (RSV G) modulates cytokine and chemokine production in monocytes, inhibiting the inflammatory response elicited by LPS stimulation. In this report, we use murine monocytes from different knockout mice to show that RSV G can inhibit the release of cytokines in the immune response against lipoplysaccharide induced sepsis. We demonstrate the modulation of IL-1β, IL-6, IL-10 and TNF-α by RSV G in monocytes LPS stimulated. Importantly, we also considered the effect of RSV G subunits (peptides) and future directions for the clinical use of the glycoprotein on LPS-mediated inflammation.