Propionibacterium acnes induces an adjuvant effect in B-1 cells and affects their phagocyte differentiation via a TLR2-mediated mechanism

Propionibacterium acnes induces an adjuvant effect in B-1 cells and affects their phagocyte differentiation via a TLR2-mediated mechanism

Author Gambero, Monica Autor UNIFESP Google Scholar
Teixeira, Daniela Autor UNIFESP Google Scholar
Butin, Liane Autor UNIFESP Google Scholar
Ishimura, Mayari Eika Autor UNIFESP Google Scholar
Mariano, Mario Autor UNIFESP Google Scholar
Popi, Ana Flavia Autor UNIFESP Google Scholar
Longo-Maugeri, Ieda Maria Autor UNIFESP Google Scholar
Abstract B-1 lymphocytes are present in large numbers in the mouse peritoneal cavity, as are macrophages, and are responsible for natural IgM production. These lymphocytes migrate to inflammatory foci and are also involved in innate immunity. It was also demonstrated that B-1 cells are able to differentiated into phagocytes (B-1CDP), which is characterized by expression of F4/80 and increased phagocytic activity. B-1 cell responses to antigens and adjuvants are poorly characterized. It has been shown that Propionibacterium acnes suspensions induce immunomodulatory effects in both macrophages and B-2 lymphocytes. We recently demonstrated that this bacterium has the ability to increase B-1 cell populations both in vitro and in vivo. P. acnes induces B-1CDP differentiation, increases the expression of TLR2, TLR4 and TLR9 and augments the expression of CD80, CD86 and CD40 in B-1 and B-1CDP cells. Because P. acnes has been shown to modulate TLR expression, in this study, we investigated the role of TLR2 and TLR4 in B-1 cell population, including B-1CDP differentiation and phagocytic activity in vitro and in vivo. Interestingly, we have demonstrated that TLR2 signaling could be involved in the increase in the B-1 cell population induced by P. acnes. Furthermore, the early differentiation of B-1CDP is also dependent of TLR2. It was also observed that TLR signals also interfere in the phagocytic ability of B-1 cells and their phagocytes. According to these data, it is clear that P. acnes promotes an important adjuvant effect in B-1 cells by inducing them to differentiate into B-1CDP cells and modulates their phagocytic functions both in vivo and in vitro. Moreover, most of these effects are mediated primarily via TLR2. These data reinforce the findings that such bacterial suspensions have powerful adjuvant properties. The responses of B-1 cells to exogenous stimulation indicate that these cells are important to the innate immune response. (C) 2016 Elsevier GmbH. All rights reserved.
Keywords Adjuvant
Innate immunity
B-1 cells
Propionibacterium acnes
Language English
Sponsor FAPESP-Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [2008/58561-0]
CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
Grant number FAPESP:2008/58561-0
Date 2016
Published in Immunobiology. Jena, v. 221, n. 9, p. 1001-1011, 2016.
ISSN 0171-2985 (Sherpa/Romeo, impact factor)
Publisher Elsevier Gmbh, Urban & Fischer Verlag
Extent 1001-1011
Access rights Closed access
Type Article
Web of Science ID WOS:000379559500009

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