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da Silva PM, da Silva BR, de Oliveira Silva JN, de Moura MC, Soares T, Feitosa APS, Brayner FA, Alves LC, Paiva PMG, Damborg P, Ingmer H, Napoleão TH. Punica granatum sarcotesta lectin (PgTeL) has antibacterial activity and synergistic effects with antibiotics against β-lactamase-producing Escherichia coli. Int J Biol Macromol 2019; 135:931-939. [PMID: 31170488 DOI: 10.1016/j.ijbiomac.2019.06.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 03/30/2019] [Accepted: 06/03/2019] [Indexed: 12/23/2022]
Abstract
The sarcotesta of Punica granatum fruit contains an antimicrobial lectin called PgTeL. In this work, we evaluated the antibacterial activity of PgTeL against five drug-resistant Escherichia coli isolates able to produce β-lactamases. Minimum inhibitory (MIC) and bactericidal (MBC) concentrations were determined by broth dilution. Morphometric and viability analyses were performed by flow cytometry, and ultrastructural changes were evaluated by scanning electron microscopy. Potential synergistic effects of PgTeL with antibiotics and anti-biofilm effect were also evaluated. PgTeL showed antibacterial activity against all isolates with MIC and MBC values ranging from 12.5 to 50.0 μg/mL and from 25.0 to 100.0 μg/mL, respectively. For most isolates, PgTeL postponed the growth start by at least ten hours. At the MIC, the lectin caused alterations in size, shape and structure of bacterial cells. The combination PgTeL-ceftazidime showed a synergistic effect for all isolates. Synergy was also detected with ampicillin (one isolate), carbenicillin (one isolate), cefotaxime (one isolate), cephalexin (four isolates) and cefuroxime (three isolates). PgTeL exhibited anti-biofilm activity against all isolates, causing ≥50% inhibition of biofilms at or above 6.25 μg/mL. The antibacterial effect of PgTeL and its synergy with antibiotics indicate that this fruit-derived molecule may have potential for future treatment of multidrug-resistant infections.
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Affiliation(s)
| | | | | | - Maiara Celine de Moura
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Brazil
| | - Tatiana Soares
- Centro de Tecnologias Estratégicas do Nordeste (CETENE), Recife, Brazil
| | - Ana Paula Sampaio Feitosa
- Laboratório de Imunopatologia Keizo Asami, Universidade Federal de Pernambuco, Recife, Brazil; Departamento de Parasitologia, Instituto Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, Brazil
| | - Fábio André Brayner
- Laboratório de Imunopatologia Keizo Asami, Universidade Federal de Pernambuco, Recife, Brazil; Departamento de Parasitologia, Instituto Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, Brazil
| | - Luiz Carlos Alves
- Laboratório de Imunopatologia Keizo Asami, Universidade Federal de Pernambuco, Recife, Brazil; Departamento de Parasitologia, Instituto Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, Brazil
| | | | - Peter Damborg
- Department of Veterinary and Animal Sciences, University of Copenhagen, Denmark
| | - Hanne Ingmer
- Department of Veterinary and Animal Sciences, University of Copenhagen, Denmark
| | - Thiago Henrique Napoleão
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Brazil.
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