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Article

Pan-Drug Resistant Acinetobacter baumannii, but Not Other Strains, Are Resistant to the Bee Venom Peptide Melittin

1
FIOCRUZ, Center for Technological, Development in Health (CDTS)/National, Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Rio de Janeiro 21040-900
2
FIOCRUZ, Oswaldo Cruz Institute, Laboratory of Cellular Ultrastructure, Rio de Janeiro 21040-900, Brazil
3
FIOCRUZ, Microbiology Department, National Institute for Quality Control in Health (INCQS), Rio de Janeiro 21040-900, Brazil
4
FIOCRUZ, Federal Fluminense University, Biology Institute, Department of Molecular and Cellular Biology, Rio de Janeiro, Niterói 24020-140, Brazil
*
Authors to whom correspondence should be addressed.
Received: 6 November 2019 / Revised: 9 December 2019 / Accepted: 14 December 2019 / Published: 14 April 2020
(This article belongs to the Special Issue Antimicrobial Peptides, Polymers and Surfaces)
Acinetobacter baumannii is a prevalent pathogen in hospital settings with increasing importance in infections associated with biofilm production. Due to a rapid increase in its drug resistance and the failure of commonly available antibiotics to treat A. baumannii infections, this bacterium has become a critical public health issue. For these multi-drug resistant A. baumannii, polymyxin antibiotics are considered the only option for the treatment of severe infections. Concerning, several polymyxin-resistant A. baumannii strains have been isolated over the last few years. This study utilized pan drug-resistant (PDR) strains of A. baumannii isolated in Brazil, along with susceptible (S) and extreme drug-resistant (XDR) strains in order to evaluate the in vitro activity of melittin, an antimicrobial peptide, in comparison to polymyxin and another antibiotic, imipenem. From a broth microdilution method, the determined minimum inhibitory concentration showed that S and XDR strains were susceptible to melittin. In contrast, PDR A. baumannii was resistant to all treatments. Treatment with the peptide was also observed to inhibit biofilm formation of a susceptible strain and appeared to cause permanent membrane damage. A subpopulation of PDR showed membrane damage, however, it was not sufficient to stop bacterial growth, suggesting that alterations involved with antibiotic resistance could also influence melittin resistance. Presumably, mutations in the PDR that have arisen to confer resistance to widely used therapeutics also confer resistance to melittin. Our results demonstrate the potential of melittin to be used in the control of bacterial infections and suggest that antimicrobial peptides can serve as the basis for the development of new treatments. View Full-Text
Keywords: Acinetobacter baumannii; multidrug resistance; pan drug resistance; melittin; biofilm; antimicrobial peptide Acinetobacter baumannii; multidrug resistance; pan drug resistance; melittin; biofilm; antimicrobial peptide
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MDPI and ACS Style

Rangel, K.; Curty Lechuga, G.; Almeida Souza, A.L.; Rangel da Silva Carvalho, J.P.; Simões Villas Bôas, M.H.; De Simone, S.G. Pan-Drug Resistant Acinetobacter baumannii, but Not Other Strains, Are Resistant to the Bee Venom Peptide Melittin. Antibiotics 2020, 9, 178. https://0-doi-org.brum.beds.ac.uk/10.3390/antibiotics9040178

AMA Style

Rangel K, Curty Lechuga G, Almeida Souza AL, Rangel da Silva Carvalho JP, Simões Villas Bôas MH, De Simone SG. Pan-Drug Resistant Acinetobacter baumannii, but Not Other Strains, Are Resistant to the Bee Venom Peptide Melittin. Antibiotics. 2020; 9(4):178. https://0-doi-org.brum.beds.ac.uk/10.3390/antibiotics9040178

Chicago/Turabian Style

Rangel, Karyne, Guilherme Curty Lechuga, André L. Almeida Souza, João P. Rangel da Silva Carvalho, Maria H. Simões Villas Bôas, and Salvatore G. De Simone 2020. "Pan-Drug Resistant Acinetobacter baumannii, but Not Other Strains, Are Resistant to the Bee Venom Peptide Melittin" Antibiotics 9, no. 4: 178. https://0-doi-org.brum.beds.ac.uk/10.3390/antibiotics9040178

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