Staphylococcus aureus é uma bactéria de preocupação global, classificada pela Organização Mundial da Saúde como um patógeno prioritário de nível alto e diferentes estratégias são empenhadas para reduzir os riscos de infecções. Este trabalho teve por objetivo avaliar a atividade do trans-resveratrol contra a linhagem de S. aureus UFPEDA 02. Foi realizada a determinação da Concentração Inibitória Mínima (CIM), Concentração Bactericida Mínima (CBM) e o Ensaio in vitro de formação do biofilme por 48 h. O trans-resveratrol demonstrou atividade na concentração de 2,5 µg/mL. Houve inibição do crescimento planctônico sem produzir efeito bactericida. O composto promoveu uma ação antibiofilme alta (cerca de 80%), com grau de inibição moderado. Em complemento não foram observadas células com capacidade de formar biofilme, visto que o ponto de corte do teste foi de 0,177. Como conclusão, o trans-resveratrol se mostrou promissor no combate ao crescimento de S. aureus UFPEDA 02.
This study assessed the adhesion of Pseudomonas aeruginosa UFPEDA 416 (ATCC 27853) exposed to curcumin-mediated Photodynamic Antimicrobial Chemotherapy (PACT). Initially, the Minimum Inhibitory Concentration of curcumin was determined (0.63 μg/mL). After, P. aeruginosa UFPEDA 416 was exposed to the MIC solution of curcumin and then irradiated with a high-power blue LED light at 480 nm for 20, 40, 60 and 120 minutes (28.03 mW/cm2). At each interval, 100 µL aliquots were transferred to microtubes containing Müeller-Hinton broth and incubated at 30ºC for 24 h. The biofilm formed was quantified by the crystal violet method. The adherence rate was calculated using the difference in the absorbance of the treatment, compared to the control. There was a reduction in adhesion capacity from 40.8% in the first 20 minutes to approximately 11% after 60 minutes. The reduction in the adhesion rate accompanied the decrease in planktonic cells, determined from the measurement of the absorbance of the supernatant at 620 nm. The results indicated action by bacteriostasis.
Molecules with antimicrobial properties, such as those found in non-antibiotic pharmaceuticals, may pressure bacteria to adapt to the environment. In this work, five of the most sold non-antibiotic pharmaceuticals in Brazil and in Egypt in 2020 (losartan 50 mg, acetylsalicylic acid 100 mg, diclofenac 50 mg, paracetamol 750 mg and metformin 500 mg and dipyrone 100 mg/mL), were tested against the wild strain Pseudomonas aeruginosa TGC04, previously isolated by our group and which has been characterized over the years. We evaluated inhibition of biofilm adhesion over 48 h using the crystal violet test. Exposure of P. aeruginosa TGC04 to the compounds promoted a similar moderate reduction in adherence for all the pharmaceuticals tested, amounting to about 60%. This indicated that the cells were also moderately adherent. However, although all non-antibiotic pharmaceuticals did not produce a biocidal effect on the wild strain, intense antibiofilm activity was observed, except for paracetamol.
Os biofilmes são agregados microbianos complexos que representam risco à saúde porque inúmeros patógenos são capazes de colonizar superfícies bióticas e abióticas, conferindo a estes microrganismos, maior resistência a antibióticos e outros agentes antimicrobianos. Além disso, os biofilmes são responsáveis por perdas na indústria, bem como pelo processo de biodeterioração de diferentes materiais. Visando formas de inibir ou erradicar biofilmes, diferentes métodos são propostos, incluindo a associação entre eles. Esta revisão foi elaborada por discentes de Pós-Graduação em Biologia Celular e Molecular da UFPB, como trabalho final da Disciplina “Biofilmes microbianos” e traz exemplos e perspectivas de tratamentos físicos, químicos e biológicos no controle destas estruturas.
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