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Effects of Lactobacillus spp. isolated from oral cavity of caries-free subjects on Streptococcus mutans: study of probiotic activity

Grant number: 14/11841-9
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): January 01, 2015
Effective date (End): April 30, 2016
Field of knowledge:Health Sciences - Dentistry
Acordo de Cooperação: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Juliana Campos Junqueira
Grantee:Marisol dos Santos Velloso
Host Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil


The idea of using micro-organisms from the resident microbiota to inhibit the growth of pathogenic bacteria was proposed over a century ago and today assists on the development of new therapeutic strategies for infections. Previous studies corroborated that probiotic strains Lactobacillus can inhibit Streptococcus mutans, however the effects of Lactobacillus on the formation of biofilms and caries development need to be investigated. The objective of this study will evaluate the effect of Lactobacillus strains isolated from caries-free subjects on S. mutans using study models in vitro and in vivo. On the in vitro study, 30 Lactobacillus strains isolated from the oral cavity of caries-free subjects will be evaluated for antibacterial activity against S. mutans in planktonic growth. Hereafter 10 strains that exhibit higher antibacterial activity will be selected for the study of antimicrobial effects on biofilms of S. mutans formed on hydroxyapatite discs. In all these tests in addition to the effects of Lactobacillus strains on S. mutans will also be evaluated the effects of the filtrated culture of Lactobacillus on S. mutans checking the inhibitory effects related to the acid environment and antimicrobial substances secreted by Lactobacillus. For in vivo study, one Lactobacillus strain will be selected with higher inhibitory effect on biofilm of S. mutans to assess its effects on the development of experimental caries in rats. After infection by S. mutans and Lactobacillus strain in the oral cavity of the rats, sampling of biofilm will be conducted to count CFU/mL and analysis of the maxilla and mandible in stereomicroscope for quantification of occlusal caries and smooth surface will be performed. The results will be submitted to an exploratory analysis for selecting the most appropriate statistical test for each experiment of this study. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ROSSONI, RODNEI DENNIS; VELLOSO, MARISOL DOS SANTOS; DE BARROS, PATRICIA PIMENTEL; DE ALVARENGA, JANAINA ARAUJO; DOS SANTOS, JESSICA DIANE; CHIPOLETTI DOS SANTOS PRADO, ANA CAROLINA; RIBEIRO, FELIPE DE CAMARGO; ANBINDER, ANA LIA; JUNQUEIRA, JULIANA CAMPOS. Inhibitory effect of probiotic Lactobacillus supernatants from the oral cavity on Streptococcus mutans biofilms. Microbial Pathogenesis, v. 123, p. 361-367, . (14/11841-9, 13/25181-8, 17/19219-3, 15/09770-9)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
VELLOSO, Marisol dos Santos. Effects of Lactobacillus spp. isolated from oral cavity of caries-free subjects on Streptococcus mutans: study of potencial probiotic. 2016. Master's Dissertation - Universidade Estadual Paulista (Unesp). Instituto de Ciência e Tecnologia. São José dos Campos São José dos Campos.

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