Journal
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
Volume 28, Issue 18, Pages 3094-3098Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmcl.2018.07.037
Keywords
Antisense technologies; Peptide nucleic acids; Antibiotics; Synergy
Categories
Funding
- National Science Centre, Poland [SYMFONIA DEC-2014/12/W/ST5/00589, PRELUDIUM 2017/25/N/NZ1/01578]
- CeNT BST funds
- Ministry of Science and Higher Education [501-D313-86-0117000-02]
- Rotary International Youth Exchange Program [D. 4100 MX - D. 2231 PL]
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A combination of antibacterial agents should make the emergence of resistance in bacteria less probable. Thus we have analyzed the synergistic effects between antibacterial antisense peptide nucleic acids (PNA) and conventional antibiotics against Escherichia coli. AS19 (lipopolysaccharide defective) strain and a derivative of a pathogenic strain E. coli. O157:H7. PNAs were designed to target mRNA transcripts encoding the essential acyl carrier protein (gene acpP) and conjugated to the cell-penetrating peptide (KFF)(3)K for cellular uptake. Antibiotics included aminoglycosides, aminopenicillins, polymyxins, rifamycins, sulfonamides and trimethoprim. Synergies were evaluated using the checkerboard technique. Fractional Inhibitory Concentration indices (FICi) were calculated for all combinations based on the minimal inhibitory concentration of each individual agent. The results demonstrate two novel synergistic combinations of antimicrobial agents, namely, (KFF)(3) K-PNA anti-acpP with polymyxin B and (KFF)(3)K-PNA anti-acpP with trimethoprim (both with FICi = 0.38). Polymyxin B's synergy postulates cell wall targeted antibiotics as attractive agents to improve the uptake of PNA while trimethoprim's interaction with PNA my reveal a new inhibitory mechanism.
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