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The use of plant extracts in Dentistry is still very restricted and because of it, more scientific studies more specific are necessary to promote their inclusion in mouthwashes, toothpastes, irrigants and intracanal medications, ointments, etc., in order to direct the therapeutic indications. This study proposes to verify in vitro: a) antimicrobial activity of natural extracts of Cynara scolymus (artichoke), Cordia verbenacea (whaling herb), Gymnema sylvestre (gimena), Thymus vulgaris (thyme) and Juglans regia (walnut) on planktonic culture and biofilms of Candida albicans, Staphylococcus aureus, Enterococcus faecalis, Streptococcus mutans, Pseudomonas aeruginosa, Porphyromonas gingivalis, Porphyromonas endodontalis, Parvimonas micra, Fusobacterium nucleatum and Prevotella intermedia; b) anti-inflammatory action in cultures of macrophages (RAW 264.7) and human gingival fibroblasts (FMN-1), after stimulation with Escherichia coli lipopolysaccharide (LPS), with analysis of the production of pro- and anti-inflammatory cytokines and nitric oxide; c) cytotoxic and genotoxic activities in macrophages (RAW 264.7) and gingival fibroblasts (FMN-1). For planktonic forms, broth microdilution method will be used, according to the Clinical and Laboratory Standards Institute (CLSI) to determine the minimum inhibitory concentrations (MIC) and minimum microbicidal concentration (MMC). For biofilms, standardized suspensions (107 cells/mL) will be added to microplate wells and after 48 h at 37°C, under agitation (75 rpm), they will be treated with different natural extracts (contact time: 5 min and 24 h). Control groups (saline solution, nystatin and chlorhexidine) will be included. Then, biofilms will be disaggregated and the suspensions will be seeded Reinforced Clostridial medium agar for anaerobic bacteria, Sabouraud-dextrose agar (yeast) or Brain Heart Infusion agar (other bacteria). After 48 hours at 37°C, the colony forming units per milliliter (CFU/mL) will be counted. The anti-inflammatory activity will be evaluated in cultures of macrophages and gingival fibroblasts stimulated with LPS and treated with the extracts. After 24 h, the supernatant will be removed and the quantification of nitric oxide, by Griess method, and proinflammatory cytokines (IL-1², TNF-±, IL-6, IL-12, IL-17) and anti-inflammatory (IL-10), by immunoenzymatic ELISA test, will be performed. Cytotoxicity will be analyzed by mitochondrial activity (MTT assay) and genotoxicity by micronucleus test. Statistical analysis will be performed by ANOVA and Tukey's test with level of significance of 5%. (AU)

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Scientific publications (6)
(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)
DO ROSARIO ESTEVAM DOS SANTOS, PAMELA BEATRIZ; AVILA, DAMARA DA SILVA; RAMOS, LUCAS DE PAULA; YU, AMANDA ROMAGNOLI; DA ROCHA SANTOS, CARLOS EDUARDO; BERRETTA, ANDRESA APARECIDA; AFONSO CAMARGO, SAMIRA ESTEVES; DE OLIVEIRA, JONATAS RAFAEL; DE OLIVEIRA, LUCIANE DIAS. Effects of Brazilian green propolis extract on planktonic cells and biofilms of multidrug-resistant strains ofKlebsiella pneumoniaeandPseudomonas aeruginosa. BIOFOULING, v. 36, n. 7, p. 834-845, . (15/08776-3)
FIGUEIRA, LEANDRO W.; DE OLIVEIRA, JONATAS R.; NETTO, AMANDIO A. L.; ZAMARIOLI, LUCAS DOS S.; MARCUCCI, MARIA C.; CAMARGOSE, SAMIRA E. A.; DE OLIVEIRA, LUCIANE D.. Curcuma longaL. helps macrophages to control opportunistic micro-organisms during host-microbe interactions. FUTURE MICROBIOLOGY, v. 15, n. 13, p. 1237-1248, . (15/08776-3)
DE OLIVEIRA, JONATAS RAFAEL; VIEGAS, DAIANE DE JESUS; REQUIA MARTINS, ANA PAULA; TALGE CARVALHO, CLAUDIO ANTONIO; SOARES, CRISTINA PACHECO; AFONSO CAMARGO, SAMIRA ESTEVES; CARDOSO JORGE, ANTONIO OLAVO; DE OLIVEIRA, LUCIANE DIAS. Thymus vulgaris L. extract has antimicrobial and anti-inflammatory effects in the absence of cytotoxicity and genotoxicity. ARCHIVES OF ORAL BIOLOGY, v. 82, p. 271-279, . (14/22149-9, 15/08776-3)
DE OLIVEIRA, JONATAS RAFAEL; FIGUEIRA, LEANDRO WAGNER; SPER, FABIA LUGLI; MECCATTI, VANESSA MARQUES; AFONSO CAMARGO, SAMIRA ESTEVES; DE OLIVEIRA, LUCIANE DIAS. Thymus vulgaris L. and thymol assist murine macrophages (RAW 264.7) in the control of in vitro infections by Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans. IMMUNOLOGIC RESEARCH, v. 65, n. 4, p. 932-943, . (15/08776-3)
MECCATTI, VANESSA M.; DE OLIVEIRA, JONATAS R.; FIGUEIRA, LEANDRO W.; NETTO, AMANDIO A. LAGAREIRO; ZAMARIOLI, LUCAS S.; MARCUCCI, MARIA C.; CAMARGO, SAMIRA E. A.; CARVALHO, CLAUDIO A. T.; DE OLIVEIRA, LUCIANE D.. Rosmarinus officinalis L. (rosemary) extract has antibiofilm effect similar to the antifungal nystatin on Candida samples. Anais da Academia Brasileira de Ciências, v. 93, n. 2, . (15/25338-0, 15/08776-3)

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