Periodontopathogens influence in the expression and production of antimicrobial peptides and inflammatory cytokines in neutrophils from healthy and periodontitis individuals

Author(s)

Flávia Sammartino Mariano Rodrigues

• Document type: Doctoral Thesis
• Press: Piracicaba, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba
• Defense date: 2010-11-06

Examining board members

Reginaldo Bruno Gonçalves; Gustavo Pompermaier Garlet; Poliana Mendes Duarte; Francisco Humberto Nociti Junior; José Francisco Höfling

• Advisor: Reginaldo Bruno Gonçalves

Abstract

Among the innate mechanisms, which are essential for the oral cavity protection, we can include antimicrobial peptides and phagocytic cells such as neutrophils, as a major. Antimicrobial peptides, LL-37 and ?-defensins or human neutrophil peptides (HNP 1-3) are produced by neutrophils and have broad activity against bacteria, fungi and enveloped viruses, an oxygen-independent microbicidal mechanism. However, neutrophils also do antimicrobial activity through nitric oxide (NO) production in phagocytosis. Also, neutrophils produce special cytokines against pathogens. Thus, neutrophils are central in the periodontal disease response, but is unclear the functional differences between neutrophils from periodontitis and healthy volunteers pos-stimulation with periodopathogens lipopolossacarideo (LPS). Then, we studied of LL-37, HNP1-3, NO and cytokines levels in culture supernatants of cells from volunteers with or without periodontitis post Porphyromonas gingivalis (Pg), Aggregatibacter actinomycetemcomitans (Aa) and Escherichia coli (Ec) LPS. We analyzed also peptides and cytokines expression in these cells. We show that neutrophils from periodontitis volunteers cultured with Aa LPS expressed higher LL-37, HNP 1-3 and IFN-? mRNA and produced more IL-12 and IFN- ? levels as the controls. Pg and Ec LPS notably improved the HNP1-3, IFN-? and IL-8 expression and the LL-37, IL-12 and IFN- ? secretion. But, neutrophils from periodontitis patients produced low NO levels and similar IL-12 mRNA and HNP 1-3 production in both the volunteers groups studied. Briefly, we can conclude that neutrophils from periodontitis patients respond more strongly than healthy neutrophils when stimulated with LPS periodontopathic bacterias. (AU)

• FAPESP's process: 07/00219-1 - Influence of periodontal pathogens on antimicrobial peptide LL37 expression in gingival tissue and neutrophils from healthy and periodontally diseased individuals
• Grantee: Flávia Sammartino Mariano Rodrigues
• Support Opportunities: Scholarships in Brazil - Doctorate