Objectives: To evaluate the effect of sub-growth-inhibitory concentrations of omadacycline on ATCC 10832 haemolytic activity .
Methods: Following determination of the MICs of omadacycline and comparator antibiotics, the strain was grown in the presence of individual antibiotics and the percentage of haemolysis assayed; 'washout' experiments were performed with omadacycline only.
Results: Omadacycline inhibited haemolytic activity at sub-growth-inhibitory concentrations. Inhibition was maintained at least 4 h after removal of extracellular drug.
Conclusions: Omadacycline's potency and suppression of virulence factors might contribute to its efficacy in the treatment of acute bacterial skin and skin structure infections and community-acquired bacterial pneumonia caused by virulent strains of . This finding could be relevant for other organisms and virulence factors that depend on new protein synthesis.
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http://dx.doi.org/10.1093/jacamr/dlab190 | DOI Listing |
J Glob Antimicrob Resist
March 2023
Department of Respiratory Medicine, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan.
Objectives: In hypervirulent Klebsiella pneumoniae (hvKP), the hypermucoviscous capsule is known to be a major virulence determinant. We previously discovered that rifampicin (RFP), a bactericidal drug that binds to and inhibits the β subunit of RNA polymerase (RpoB), elicits anti-mucoviscous activity against hvKP by suppressing rmpA, a regulator of capsule production. Here, we aimed to determine whether RFP exerts this effect at sub-growth-inhibitory concentrations via its binding to RpoB.
View Article and Find Full Text PDFNanomaterials (Basel)
September 2022
Institute of Environmental and Health Sciences, China Jiliang University, Hangzhou 310018, China.
Medical applications of nanotechnology are promising in creating efficient and targeted therapies. However, so far, nanodrug design has not taken into consideration possible effects on human microbiota. The beneficial functions of bacteria could be stimulated by nanodrugs while negative effects on beneficial bacteria could cause risks to human health.
View Article and Find Full Text PDFPeerJ
January 2023
Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico City, Mexico.
Antimicrobial peptides (AMPs) are versatile molecules with broad antimicrobial activity produced by representatives of the three domains of life. Also, there are derivatives of AMPs and artificial short peptides that can inhibit microbial growth. Beyond killing microbes, AMPs at grow sub-inhibitory concentrations also exhibit anti-virulence activity against critical pathogenic bacteria, including ESKAPE pathogens.
View Article and Find Full Text PDFJAC Antimicrob Resist
March 2022
Paratek Pharmaceuticals, Inc., 1000 First Ave, Suite 200, King of Prussia, PA 19406, USA.
Objectives: To evaluate the effect of sub-growth-inhibitory concentrations of omadacycline on ATCC 10832 haemolytic activity .
Methods: Following determination of the MICs of omadacycline and comparator antibiotics, the strain was grown in the presence of individual antibiotics and the percentage of haemolysis assayed; 'washout' experiments were performed with omadacycline only.
Results: Omadacycline inhibited haemolytic activity at sub-growth-inhibitory concentrations.
Molecules
September 2021
Department of Chemistry, Mindanao State University-Iligan Institute of Technology, Iligan City 9200, Philippines.
We report the first isolation of the alkaloid aaptamine from the Philippine marine sponge sp. Aaptamine possessed weak antiproliferative activity against HCT116 colon cancer cells and inhibited the proteasome in vitro at 50 µM. These activities may be functionally linked.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!