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dc.contributor.authorNagant, C.
dc.contributor.authorPitts, Betsey
dc.contributor.authorNazmi, K.
dc.contributor.authorVandenbranden, M.
dc.contributor.authorBolscher, J. G.
dc.contributor.authorStewart, Philip S.
dc.contributor.authorDehaye, J. P.
dc.identifier.citationNagant C, Pitts B, Nazmi K, Vandenbranden M, Bolscher JG, Stewart PS, Dehaye J-P , "Identification of peptides derived from the human antimicrobial peptide LL-37 active against biofilms formed by Pseudomonas aeruginosa using a library of truncated fragments," Antimicrobial Agents and Chemotherapy, November 2012 56(11):5698-5708en_US
dc.description.abstractPersistent Pseudomonas aeruginosa infections are a major cause of morbidity and mortality in cystic fibrosis (CF) patients andare linked to the formation of a biofilm. The development of new biofilm inhibition strategies is thus a major challenge. LL-37 isthe only human antimicrobial peptide derived from cathelicidin. The effects on the P. aeruginosa PAO1 strain of synthetic truncatedfragments of this peptide were compared with the effects of the original peptide. Fragments of LL-37 composed of 19 residues(LL-19, LL13-31, and LL7-25) inhibited biofilm formation. The strongest antibiofilm activity was observed with the peptidesLL7-37 and LL-31, which decreased the percentage of biomass formation at a very low concentration. Some peptides werealso active on the bacteria within an established biofilm. LL7-31, LL-31, and LL7-37 increased the uptake of propidium iodide(PI) by sessile bacteria. The peptide LL7-37 decreased the height of the biofilm and partly disrupted it. The peptides active within the biofilm had an infrared spectrum compatible with an -helix. LL-37, but not the peptides LL7-31 and LL7-37, showed cellular toxicity by permeabilizing the eukaryotic plasma membrane (uptake of ethidium bromide and release of lactate dehydrogenase [LDH]). None of the tested peptides affected mitochondrial activity in eukaryotic cells. In conclusion, a 25-amino-acid peptide (LL7-31) displayed both strong antimicrobial and antibiofilm activities. The peptide was even active on cells within a preformed biofilm and had reduced toxicity toward eukaryotic cells. Our results also suggest the contribution of secondary structures ( -helix) to the activity of the peptides on biofilms.en_US
dc.titleIdentification of peptides derived from the human antimicrobial peptide LL-37 active against biofilms formed by Pseudomonas aeruginosa using a library of truncated fragmentsen_US
mus.citation.journaltitleAntimicrobial Agents and Chemotherapyen_US
mus.identifier.categoryChemical & Material Sciencesen_US
mus.identifier.categoryEngineering & Computer Scienceen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentCell Biology & Neuroscience.en_US
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.departmentChemical & Biological Engineering.en_US
mus.relation.departmentChemical Engineering.en_US
mus.relation.departmentChemistry & Biochemistry.en_US
mus.relation.departmentMicrobiology & Immunology.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupCenter for Biofilm Engineering.en_US
mus.contributor.orcidStewart, Philip S.|0000-0001-7773-8570en_US

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