Title

Mouse fibroblasts guide IL-23 induction by Porphyromonas gingivalis-stimulated Dendritic Cells in gingipain-dependent manner

ORCiD

Ana C. Morandini: 0000-0003-4749-571X

Document Type

Poster

Conference Title

EUROPERIO 7 - 7th Conference of the European Federation of Periodontology

Organization

European Federation of Periodontology

DOI

10.1111/j.1600-051x-2012.01891.x

Location

Vienna, Austria

Conference Dates

June 6-9, 2012

Date of Presentation

6-6-2012

Abstract

Aim: In a previous study, we reported that bradykinin release in BALB/c subgingival tissues exposed to P.gingivalis induces IL17-producing and INF-γ producing T cells in gingipain-dependent manner (Monteiro et al., J.Immunol. , 2009). Here, we sought to determine whether (i) bone marrow derived DCs exposed to P.gingivalis (W83) versus gingipain-deficient mutants (KRAB) differentially produce IL-23, i.e., a key Th17-polaring cytokines (ii) gingival fibroblasts (GF) may modulate the response profile of immature DCs (IL-23 and CCR7) in gingipain-dependent manner.

Material and Methods: Mouse BMDCs were co-cultured with mouse GFs and stimulated with P. gingivalis LPS (0.1 ug/mL), P. gingivalis (strain W83) or a triple gingipain knockout P. gingivalis (KRAB) for 24 h. Subsequently, the supernatants were collected and IL-23 levels were quantified by ELISA whereas CCR7 expression by CD11c+ DCs was determined by FACS.

Results: Our results indicate that bacteria-exposed GF/DCs led to a prounced enhancement of IL-23 responses by the CD11c+ DCs partner, as compared to (i) cultures containing only DCs (ii) GF/DC co-cultures exposed to the KRAB mutant. Furthermore, CCR7 expression, likewise dependent on gingipain, was upregulated independently of co-culturing with GF.

Conclusion: Our results suggest that GFs condition the functional responses of immature DCs, shifting P.gingivalis-evoked maturation responses towards the IL-23 innate pathway. Ongoing studies should determine the role of GF versus DCs on the gingipain/bradykinin B2 receptor pathway leading to Th17 polarization in BALB/c mice infected by P.gingivalis.

Comments

Published Abstract can be found in the Journal of Clinical Periodontology - Vol. 39, Supplement 13, 2012, p. 243. DOI: 10.1111/j.1600-051x-2012.01891.x

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