RESUMO
Poincianella (Caesalpinia) microphylla fractions were analyzed by LC-DAD-MS and by statistical tools to determine the possible bioactive compounds against T. vaginalis. Tannins enriched-fractions toxicity (M5 and M10) were analyzed in in vitro against human red cells and in in vivo model of Galleria mellonella. Twenty-six compounds were detected from the P. microphylla fractions. The main compounds identified were hydrolyzable tannins (gallotanins and ellagitannis), such as O-digalloyl hexoside, O-digalloyl HHDP -hexoside, tri-O-galloyl HHDP-hexoside, O-galloyl HHDP-DHHDP-hexoside and their isomers. In addition, procyanidin dimer, epicatechin, ellagic acid and O-(digalloyl) quinic acid were also identified. Based on univariate statistical analyses, stronger correlations with the anti-T. vaginalis properties were observed for the compounds 7 (O-galloyl HHDP-DHHDP-hexoside - Geraniin isomer), 3 (O-digalloyl HHDP -hexoside - mallotinic acid), 2 (O-digalloyl) quinic acid), 1 (O-digalloyl hexoside) and 9 (unknown). Tannins enriched-fractions (M5 and M10) presented anti-Trichomonas activity (IC50 70.41 µg/mL and 142.1 µg/mL, respectively) and no toxicity in the in vivo model of G. mellonella. This innovative approach allowed us to identify likely bioactive compounds in the extracts, although the mechanism(s) underlying anti-trichomonal activity encompass a complex trait.
Assuntos
Caesalpinia , Trichomonas vaginalis , Frutas , Humanos , Taninos Hidrolisáveis/farmacologia , TaninosRESUMO
AIMS: To evaluate the antibiofilm potential of water-soluble Moringa oleifera seed lectin (WSMoL) on Serratia marcescens and Bacillus sp. METHODS AND RESULTS: WSMoL inhibited biofilm formation by S. marcescens at concentrations lower than 2·6 µg ml-1 and impaired bacterial growth at higher concentrations, avoiding biofilm formation. For Bacillus sp., the lectin inhibited bacterial growth at all concentrations. The antibiofilm action of WSMoL is associated with damage to bacterial cells. WSMoL did not disrupt preformed S. marcescens biofilms but was able to damage cells inside them. On the other hand, the lectin reduced the number of cells in Bacillus sp. biofilm treated with it. WSMoL was able to control biofilm formation when immobilized on glass surface (116 µg cm-2 ), damaging S. marcescens cells and avoiding adherence of Bacillus sp. cells on glass. The Bacillus sp. isolate is member of Bacillus subtilis species complex and closely related to species of the conspecific 'amyloliquefaciens' group. CONCLUSION: WSMoL prevented biofilm development by S. marcescens and Bacillus sp. and the antibiofilm effect is also observed when the lectin is immobilized on glass. SIGNIFICANCE AND IMPACT OF THE STUDY: Taking together, our results provide support to the potential use of WSMoL for controlling biofilm formation by bacteria.
Assuntos
Antibacterianos/farmacologia , Bacillus/efeitos dos fármacos , Biofilmes/efeitos dos fármacos , Lectinas/farmacologia , Moringa oleifera/química , Extratos Vegetais/farmacologia , Serratia marcescens/efeitos dos fármacos , Antibacterianos/isolamento & purificação , Bacillus/fisiologia , Lectinas/isolamento & purificação , Extratos Vegetais/isolamento & purificação , Sementes/química , Serratia marcescens/fisiologiaRESUMO
Staphylococcus aureus is an opportunistic pathogen related to a variety of life-threatening infections but for which antimicrobial resistance is liming the treatment options. We report here that myricetin, but not its glycosylated form, can remarkably decrease the production of several S. aureus virulence factors, including adhesion, biofilm formation, hemolysis and staphyloxanthin production, without interfering with growth. Myricetin affects both surface proteins and secreted proteins which indicate that its action is unrelated to inhibition of the agr quorum sensing system. Analysis of virulence related gene expression and computational simulations of pivotal proteins involved in pathogenesis demonstrate that myricetin downregulates the saeR global regulator and interacts with sortase A and α-hemolysin. Furthermore, Myr confers a significant degree of protection against staphylococcal infection in the Galleria mellonella model. The present findings reveal the potential of Myr as an alternative multi-target antivirulence candidate to control S. aureus pathogenicity.
Assuntos
Flavonoides/farmacologia , Mariposas/efeitos dos fármacos , Mariposas/microbiologia , Substâncias Protetoras/farmacologia , Infecções Estafilocócicas/microbiologia , Staphylococcus aureus/efeitos dos fármacos , Staphylococcus aureus/fisiologia , Fatores de Virulência/antagonistas & inibidores , Animais , Aderência Bacteriana/efeitos dos fármacos , Biofilmes/efeitos dos fármacos , Eritrócitos/efeitos dos fármacos , Eritrócitos/metabolismo , Proteínas da Matriz Extracelular/metabolismo , Flavonoides/química , Perfilação da Expressão Gênica , Hemólise/efeitos dos fármacos , Modelos Moleculares , Ligação Proteica , Conformação Proteica , Relação Estrutura-Atividade , Xantofilas/biossíntese , Xantofilas/químicaRESUMO
Research on microbiota in cattle tick and the evaluation of its activity against other microorganisms can contribute to identify new molecules potentially useful to control infections caused by bacteria and protozoa. Biofilms pose increasing problems worldwide, mainly due to their resistance to antimicrobial therapies and host immune response. In this study we investigate the ability Rhipicephalus (Boophilus) microplus-associated bacteria may exhibit to produce anti-biofilm and trichomonicidal compounds. Gut, ovary, salivary glands, and Gené organ were collected from engorged R. microplus female. Homogenates of each tissue were inoculated onto 15 distinct culture media. Anti-biofilm and trichomonicidal activities were analyzed by culturing each bacterium isolated in a liquid medium. Results showed that R. microplus cattle tick microflora varies for different tissues. Bacteria belonging to different genera (Aeromonas, Bacillus, Brevibacillus, Castelaniella, Comamonas, Kocuria, and Microbacterium) were identified. Interestingly, all bacterial species found displayed pronounced activity against Staphylococcus epidermidis and Pseudomonas aeruginosa biofilms, and also against the cattle pathogen Tritrichomonas foetus, confirming the hypothesis that cattle tick could be a source of bacteria active against pathogens. This is the first study showing that bacteria isolated from a tick exert anti-biofilm and trichomonicidal activities.
Assuntos
Antibiose , Bactérias/química , Bovinos/parasitologia , Microbiota , Rhipicephalus/microbiologia , Tritrichomonas foetus/fisiologia , Animais , Bactérias/classificação , Bactérias/isolamento & purificação , Biofilmes , Feminino , Pseudomonas aeruginosa/fisiologia , Staphylococcus aureus/fisiologiaRESUMO
We report the antibiofilm activity by the sponge-associated bacterium Cobetia marina upon Staphylococcus epidermidis clinical isolates obtained from central venous catheters. Antibiofilm activity/antimicrobial susceptibility correlation might predict the action of the metabolite(s) upon Staphylococcus epidermidis in the clinic, making it a possible adjuvant in therapies against biofilm-associated infections.
RESUMO
We report the antibiofilm activity by the sponge-associated bacterium Cobetia marina upon Staphylococcus epidermidis clinical isolates obtained from central venous catheters. Antibiofilm activity/antimicrobial susceptibility correlation might predict the action of the metabolite(s) upon Staphylococcus epidermidis in the clinic, making it a possible adjuvant in therapies against biofilm-associated infections.
RESUMO
We report the antibiofilm activity by the sponge-associated bacterium Cobetia marina upon Staphylococcus epidermidis clinical isolates obtained from central venous catheters. Antibiofilm activity/antimicrobial susceptibility correlation might predict the action of the metabolite(s) upon Staphylococcus epidermidis in the clinic, making it a possible adjuvant in therapies against biofilm-associated infections.