PERP, a host tetraspanning membrane protein, is required for Salmonella-induced inflammation

Salmonella enterica Typhimurium induces intestinal inflammation through the activity of type III secreted effector (T3SE) proteins. Our prior results indicate that the secretion of the T3SE SipA and the ability of SipA to induce epithelial cell responses that lead to induction of polymorphonuclear transepithelial migration are not coupled to its direct delivery into epithelial cells from Salmonella. We therefore tested the hypothesis that SipA interacts with a membrane protein located at the apical surface of intestinal epithelial cells. Employing a split ubiquitin yeast-two-hybrid screen, we identified the tetraspanning membrane protein, p53 effector related to PMP-22 (PERP), as a SipA binding partner. SipA and PERP appear to have intersecting activities as we found PERP to be involved in proinflammatory pathways shown to be regulated by SipA. In sum, our studies reveal a critical role for PERP in the pathogenesis of S. Typhimurium, and for the first time demonstrate that SipA, a T3SE protein, can engage a host protein at the epithelial surface

Anticorpos séricos na doença celíaca Celiac disease serum antibodies

O diagnóstico acurado da doença celíaca é muito importante porque os pacientes devem aderir a uma dieta sem glúten por toda a vida e diante do maior risco de complicações, como as neoplasias intestinais, que poderá advir do não cumprimento rigoroso da dieta. Nesta revisão são apresentados os novos conceitos referentes às formas de apresentação da doença (ativa, silenciosa, latente e potencial) e sua associação com outras enfermidades e são focalizados principalmente o valor e a eficácia da determinação dos anticorpos séricos antigliadina e dos autoanticorpos anti-reticulina, antiendomísio e antitransglutaminase tecidual, no auxílio ao diagnóstico e seguimento da doença celíaca.<br>Accurate diagnosis of celiac disease is important because patients are advised to adhere to a strict gluten-free diet for life. This management is critical to avoid disease complications such as malignancies. In this review the new terminology for the disease clinical features (active, silent, latent and potential celiac disease) and the disease association with other conditions are commented. The value and efficacy of the assessment of serum antigliadin antibodies and of antireticulin, antiendomysial and tissue transglutaminase autoantibodies in the diagnosis and follow-up of the celiac disease are particularly evaluated