Efeitos das cepas probioticas de Lactobacillus acidophilus ATCC 4356, Lactobacillus rhamnosus ATCC 1465 e ATCC 7469 sobre o crescimento planctonico e formação de biofilme de Streptococcus mutans UA 159

• Autor(a) principal: Carneiro, Tamara Rodrigues de Andrade [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/136725; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/28-03-2016/000860755.pdf
• topic: Biofilme; Microbiologia; Probióticos; Saúde bucal; Microbiology

Most probiotic bacteria used in commercial products belong to the genus Lactobacillus. However, the effects of Lactobacillus probiotic strains in the oral health need to be further investigated. The objective of this study is to evaluate the effects of probiotic Lactobacillus strains, on Streptococcus mutans. Lactobacillus strains acidophilus ATCC 4356, Lactobacillus rhamnosus ATCC 1465, Lactobacillus rhamnosus ATCC 7469 were tested on planktonic and biofilm growth of Streptococcus mutans (UA159). In order to study the antimicrobial activity of Lactobacillus on planktonic growth of S. mutans, standardized suspensions of these microorganisms were grown together in BHI for 24 hours at 37 °C in 5% CO2. In order to study the antimicrobial activity on biofilm growth, standardized suspensions of each strain of Lactobacillus were added to the S. mutans biofilm formed on the bottom of 96 well plates. Biofilms were incubated in BHI broth with 15% sucrose at 37 °C for 48 h and then were separated by ultrasonic homogenization. After the tests with planktonic and biofilm growth, serial dilutions and sowing in selective culture media were performed for S. mutans (Mitis Salivarius Bacitracin Sucrose agar) and Lactobacillus (Rogosa agar). Subsequently, colony forming units (CFU / mL) were counted and submitted to the Student t test, considering a level of 5% significance. The results show that the 3 Lactobacillus probiotic strains reduced the planktonic growth of S. mutans, however, no significant statistical differences were observed between the control (S. mutans) and interaction groups (S. mutans and Lactobacillus strain). Regarding biofilm growth, only the strain of Lactobacillus rhamnosus 1465 showed a significant reduction of S. mutans biofilm (p < 0.0001). It was concluded that the probiotic strains tested do not stimulate the growth nor biofilm formation of S. mutans. Moreover, the Lactobacillus rhamnosus 1465 strain has shown the potential ....