N-terminal fusion of a toll-like receptor 2-ligand to a Neospora caninum chimeric antigen efficiently modifies the properties of the specific immune response
| Autor: | Vera Manser, Vreni Balmer, Andrew Hemphill, Adriana Aguado-Martínez, Alexandre Leitão, Afonso P. Basto, Joachim Müller |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Transplacental transmission Placenta Recombinant Fusion Proteins 030106 microbiology Antibodies Protozoan Antigens Protozoan Biology Ligands Immunoglobulin G 03 medical and health sciences Mice Immune system Antigen Pregnancy parasitic diseases Chlorocebus aethiops Animals Vero Cells Toll-like receptor Immunity Cellular Mice Inbred BALB C 630 Agriculture Neospora Brain biology.organism_classification Acquired immune system Neospora caninum Immunity Innate Toll-Like Receptor 2 030104 developmental biology Infectious Diseases Immunology biology.protein Cytokines Animal Science and Zoology Parasitology Female Antibody |
| Zdroj: | Aguado Martinez, Adriana; Silva Pinto Basto, Afonso; Müller, Joachim; Balmer, Vreni; Manser, Vera; Leitão, Alexandre; Hemphill, Andrew (2016). N-terminal fusion of a toll-like receptor 2-ligand to a Neospora caninum chimeric antigen efficiently modifies the properties of the specific immune response. Parasitology, 143(5), pp. 606-616. Cambridge University Press 10.1017/S0031182016000056 |
| ISSN: | 1469-8161 |
| DOI: | 10.1017/S0031182016000056 |
| Popis: | SUMMARYImmunoprophylactic products against neosporosis during pregnancy should induce an appropriately balanced immune response. In this respect, OprI, a bacterial lipoprotein targeting toll like receptor (TLR)2, provides promising adjuvant properties. We report on the manipulation of the innate and the T-cell immune response through the fusion of OprI with the Neospora caninum chimeric protein Mic3-1-R. In contrast to Mic3-1-R, OprI-MIC3-1-R significantly activated bone-marrow dendritic cells from naïve mice. Mice immunized with OprI-Mic3-1-R induced an immune response with mixed T helper (Th)1 and Th2 properties (high levels of both immunoglobulin (Ig)G1 and IgG2a and of interleukin (IL)-10, IL-12(p70) and interferon-γ responses) whereas Mic3-1-R+saponin induced a clear Th2-biased response (low IgG2a and high IL-4 and IL-10). After mating and challenge with N. caninum, increased expression of interferon-γ was only found in placentas from OprI-Mic3-1-R immunized dams. However, no protection against vertical transmission and neonatal mortality was observed in either of the two groups. These results indicated that more exhaustive studies must be done to elucidate the immune mechanisms associated with transplacental transmission. Antigen linkage to TLR2-ligands, such as OprI, is a useful tool to investigate this enigma by reorienting the innate and adaptive immune responses against other candidate antigens in future studies. |
| Databáze: | OpenAIRE |
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