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Dias E, Oliveira M, Jones-Dias D, Vasconcelos V, Ferreira E, Manageiro V, Caniça M. Assessing the antibiotic susceptibility of freshwater Cyanobacteria spp. Front Microbiol 2015; 6:799. [PMID: 26322027 PMCID: PMC4531292 DOI: 10.3389/fmicb.2015.00799] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 07/22/2015] [Indexed: 01/10/2023] Open
Abstract
Freshwater is a vehicle for the emergence and dissemination of antibiotic resistance. Cyanobacteria are ubiquitous in freshwater, where they are exposed to antibiotics and resistant organisms, but their role on water resistome was never evaluated. Data concerning the effects of antibiotics on cyanobacteria, obtained by distinct methodologies, is often contradictory. This emphasizes the importance of developing procedures to understand the trends of antibiotic susceptibility in cyanobacteria. In this study we aimed to evaluate the susceptibility of four cyanobacterial isolates from different genera (Microcystis aeruginosa, Aphanizomenon gracile, Chrisosporum bergii, Planktothix agradhii), and among them nine isolates from the same specie (M. aeruginosa) to distinct antibiotics (amoxicillin, ceftazidime, ceftriaxone, kanamycine, gentamicine, tetracycline, trimethoprim, nalidixic acid, norfloxacin). We used a method adapted from the bacteria standard broth microdilution. Cyanobacteria were exposed to serial dilution of each antibiotic (0.0015-1.6 mg/L) in Z8 medium (20 ± 1°C; 14/10 h L/D cycle; light intensity 16 ± 4 μEm(-2)s(-1)). Cell growth was followed overtime (OD450nm /microscopic examination) and the minimum inhibitory concentrations (MICs) were calculated for each antibiotic/isolate. We found that β-lactams exhibited the lower MICs, aminoglycosides, tetracycline and norfloxacine presented intermediate MICs; none of the isolates were susceptible to trimethoprim and nalidixic acid. The reduced susceptibility of all tested cyanobacteria to some antibiotics suggests that they might be naturally non-susceptible to these compounds, or that they might became non-susceptible due to antibiotic contamination pressure, or to the transfer of genes from resistant bacteria present in the environment.
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Affiliation(s)
- Elsa Dias
- National Reference Laboratory of Antimicrobial Resistances and Healthcare Associated Infections, Department of Infectious Diseases, National Institute of Health Dr. Ricardo JorgeLisbon, Portugal
- Laboratory of Biology and Ecotoxicology, Department of Environmental Health, National Institute of Health Dr. Ricardo JorgeLisbon, Portugal
- Centre for the Study of Animal Sciences, University of PortoPorto, Portugal
| | - Micaela Oliveira
- Laboratory of Biology and Ecotoxicology, Department of Environmental Health, National Institute of Health Dr. Ricardo JorgeLisbon, Portugal
| | - Daniela Jones-Dias
- National Reference Laboratory of Antimicrobial Resistances and Healthcare Associated Infections, Department of Infectious Diseases, National Institute of Health Dr. Ricardo JorgeLisbon, Portugal
- Centre for the Study of Animal Sciences, University of PortoPorto, Portugal
| | - Vitor Vasconcelos
- Laboratory of Ecotoxicology, Genomics and Evolution, Interdisciplinary Centre of Marine and Environmental Research, University of PortoPorto, Portugal
- Faculty of Sciences, University of PortoPorto, Portugal
| | - Eugénia Ferreira
- National Reference Laboratory of Antimicrobial Resistances and Healthcare Associated Infections, Department of Infectious Diseases, National Institute of Health Dr. Ricardo JorgeLisbon, Portugal
| | - Vera Manageiro
- National Reference Laboratory of Antimicrobial Resistances and Healthcare Associated Infections, Department of Infectious Diseases, National Institute of Health Dr. Ricardo JorgeLisbon, Portugal
- Centre for the Study of Animal Sciences, University of PortoPorto, Portugal
| | - Manuela Caniça
- National Reference Laboratory of Antimicrobial Resistances and Healthcare Associated Infections, Department of Infectious Diseases, National Institute of Health Dr. Ricardo JorgeLisbon, Portugal
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Mishra AK, Shukla E, Singh SS. Phylogenetic comparison among the heterocystous cyanobacteria based on a polyphasic approach. PROTOPLASMA 2013; 250:77-94. [PMID: 22307204 DOI: 10.1007/s00709-012-0375-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Accepted: 01/03/2012] [Indexed: 05/31/2023]
Abstract
Phylogenetic comparison has been done among the selected heterocystous cyanobacteria belonging to the sections IV and V. The hierarchical cluster analysis based on antibiotics sensitivity showed a distant relationship between the members of Nostocales and Stigonematales. Thus, multiple antibiotic resistance pattern used as marker provide easy, fast, and reliable method for strain discrimination and genetic variability. However, morphological, physiological (both based on principal component analysis) and biochemical analysis grouped true branching cyanobacteria along with the members of section IV. Molecular analysis based on 16S rRNA gene sequences revealed that Hapalosiphon welwitschii and Westiellopsis sp. were grouped in cluster I whereas Scytonema bohnerii, a false branching genera showed a close proximity with Calothrix brevissima in cluster II. Cluster III of clade 2 included Nostoc calcicola and Anabaena oryzae which proved the heterogeneity at the generic level. Cluster IV the largest group of clade 2 based on 16S rRNA gene sequences includes six strains of the genera Nostoc, Anabaena, and Cylindrospermum showing ambiguous evolutionary relationship. In cluster IV, Anabaena sp. and Anabaena doliolum were phylogenetically linked by sharing 99% sequence similarity. Probably, they were of the same genetic makeup but appear differently under the diverse physiological conditions. Section IV showed polyphyletic origin whereas section V showed monophyletic origin. Results suggested that either morphological or physiological or biochemical or molecular attribute is not sufficient to provide true diversity and phylogeny of the cyanobacteria at the generic level and thus, a polyphasic approach would be more appropriate and reliable.
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Affiliation(s)
- Arun Kumar Mishra
- Laboratory of Microbial genetics, Department of Botany, Banaras Hindu University, Varanasi 221005, India.
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Ability to use ampicillin as a nitrogen source by the marine cyanobacteriumPhormidium valderianum BDU 30501. Curr Microbiol 1994. [DOI: 10.1007/bf01570194] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Changes in intracellular and extracellular ?-amino acids in Gloeothece during N2-fixation and following addition of ammonium. Arch Microbiol 1990. [DOI: 10.1007/bf00245267] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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