The role of Lsa23 to mediate the interaction of Leptospira interrogans with the terminal complement components pathway
| Autor: | Silvio Arruda Vasconcellos, Gabriela H. Siqueira, Gisele Oliveira de Souza, Marcos Bryan Heinemann, Ana L. T. O. Nascimento |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Genetic Vectors 030106 microbiology Virulence Microbiology 03 medical and health sciences Immune system Bacterial Proteins Leptospira Humans Leptospirosis Protein Interaction Domains and Motifs Adhesins Bacterial Immune Evasion Innate immune system biology ZOONOSES POR BACTÉRIAS Membrane Proteins Complement System Proteins Complement C9 biology.organism_classification Complement C8 Virology Complement C7 Immunity Innate Recombinant Proteins Complement system Bacterial adhesin Infectious Diseases Leptospira interrogans Carrier Proteins Complement membrane attack complex |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 0882-4010 |
| Popis: | Leptospirosis is a severe worldwide zoonotic disease caused by pathogenic Leptospira spp. It has been demonstrated that pathogenic leptospires are resistant to the bactericidal activity of normal human serum while saprophytic strains are susceptible. Pathogenic strains have the ability to bind soluble complement regulators and these activities are thought to contribute to bacterial immune evasion. One strategy used by some pathogens to evade the complement cascade, which is not well explored, is to block the terminal pathway. We have, thus, examined whether leptospires are able to interact with components of the terminal complement pathway. ELISA screening using anti-leptospires serum has shown that the pathogenic, virulent strain L. interrogans L1-130 can bind to immobilized human C8 (1 μg). However, virulent and saprophyte L. biflexa strains showed the ability to interact with C8 and C9, when these components were employed at physiological concentration (50 μg/mL), but the virulent strain seemed more competent. Lsa23, a putative leptospiral adhesin only present in pathogenic strains, interacts with C8 and C9 in a dose-dependent mode, suggesting that this protein could mediate the binding of virulent Leptospira with these components. To our knowledge, this is the first work reporting the binding of Leptospira to C8 and C9 terminal complement components, suggesting that the inhibition of this pathway is part of the strategy used by leptospires to evade the innate immunity. |
| Databáze: | OpenAIRE |
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