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Iribarnegaray V, González MJ, Caetano AL, Platero R, Zunino P, Scavone P. Relevance of iron metabolic genes in biofilm and infection in uropathogenic Proteus mirabilis. Curr Res Microb Sci 2021; 2:100060. [PMID: 34841350 PMCID: PMC8610330 DOI: 10.1016/j.crmicr.2021.100060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 07/19/2021] [Accepted: 08/15/2021] [Indexed: 11/16/2022] Open
Abstract
The microorganisms are found in the environment, forming sessile communities embedded in an extracellular matrix of their own production, called biofilm. These communities have a great relevance in the clinical context, since they are associated with infections caused by biofilm in medical implants, such as urinary catheters. The development of biofilms is a complex process where a great diversity of genes participate. The present work is based on the study of genes related to iron metabolism and its implication in the development of P. mirabilis biofilms and pathogenicity. For this study, two mutant strains defective in biofilm formation were selected, generated by the interruption of genes that encoded non-heme ferritin and TonB-dependent receptor. The mutations influence on the development of the biofilm was evaluated by different approaches. The complexity of the biofilm was analyzed using Confocal Laser Microscopy and image analysis. The mutants infectivity potential was assessed in two experimental mice models of urinary tract infection. The results obtained in the present work show us the role of the ferritin and a TonB-associated porin protein over the initial and later stages of biofilm development. Moreover, in the ascending UTI mouse model, both mutants failed to colonize the urinary tract. In CAUTI models, ferritin mutant damaged the bladder similarly to wild type but the Ton-B mutant was unable to generate infection in the urinary tract. The results obtained in the present work confirm the relevant role that iron metabolism genes have in P. mirabilis biofilm development and for infection in the urinary tract.
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Affiliation(s)
- V Iribarnegaray
- Department of Microbiology, Instituto de Investigaciones Biológicas Clemente Estable, Avda. Italia 3318, Montevideo CP 11600, Uruguay
- Department of Pathobiology, Facultad de Veterinaria, Universidad de la República, Alberto Lasplaces 1620, Montevideo, Uruguay
| | - MJ González
- Laboratory of Microbial Biofilms, Department of Microbiology, Instituto de Investigaciones Biológicas Clemente Estable, Avda. Italia 3318, Montevideo CP 11600, Uruguay
| | - AL Caetano
- Department of Microbiology, Instituto de Investigaciones Biológicas Clemente Estable, Avda. Italia 3318, Montevideo CP 11600, Uruguay
| | - R Platero
- Department of Biochemistry and Microbial Genomics, Instituto de Investigaciones Biológicas Clemente Estable, Avda. Italia 3318, Montevideo CP 11600, Uruguay
| | - P Zunino
- Department of Microbiology, Instituto de Investigaciones Biológicas Clemente Estable, Avda. Italia 3318, Montevideo CP 11600, Uruguay
| | - P Scavone
- Laboratory of Microbial Biofilms, Department of Microbiology, Instituto de Investigaciones Biológicas Clemente Estable, Avda. Italia 3318, Montevideo CP 11600, Uruguay
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Queiroz VC, Sales SMC, Nicoliche T, Erustes AG, Pereira GJ, Smaili SS, Stilhano RS, Caetano AL. DEVELOPMENT OF SCAFFOLD-FREE SPHEROIDS OVEREXPRESSING ALPHA-SYNUCLEIN IN HUMAN NEUROBLASTOMA SH-SY5Y AS A MODEL OF PARKINSON'S DISEASE. Cytotherapy 2021. [DOI: 10.1016/j.jcyt.2021.02.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Caetano AL, Dong-Creste KE, Amaral FA, Monteiro-Silva KC, Pesquero JB, Araujo MS, Montor WR, Viel TA, Buck HS. Kinin B2 receptor can play a neuroprotective role in Alzheimer's disease. Neuropeptides 2015; 53:51-62. [PMID: 26387425 DOI: 10.1016/j.npep.2015.09.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 09/04/2015] [Accepted: 09/05/2015] [Indexed: 12/19/2022]
Abstract
Alzheimer's disease (AD) is characterized by cognitive decline, presence of amyloid-beta peptide (Aβ) aggregates and neurofibrillary tangles. Kinins act through B1 and B2 G-protein coupled receptors (B1R and B2R). Chronic infusion of Aβ peptide leads to memory impairment and increases in densities of both kinin receptors in memory processing areas. Similar memory impairment was observed in C57BL/6 mice (WTAβ) but occurred earlier in mice lacking B2R (KOB2Aβ) and was absent in mice lacking B1R (KOB1Aβ). Thus, the aim of this study was to evaluate the participation of B1R and B2R in Aβ peptide induced cognitive deficits through the evaluation of densitiesof kinin receptors, synapses, cell bodies and number of Aβ deposits in brain ofWTAβ, KOB1Aβ and KOB2Aβ mice. An increase in B2R density was observed in both WTAβ and KOB1Aβ in memory processing related areas. KOB1Aβ showed a decrease in neuronal density and an increase in synaptic density and, in addition, an increase in Aβ deposits in KOB2Aβ was observed. In conclusion, memory preservation in KOB1Aβ, could be due to the increase in densities of B2R, suggesting a neuroprotective role for B2R, reinforced by the increased number of Aβ plaques in KOB2Aβ. Our data point to B2R as a potential therapeutic target in AD.
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Affiliation(s)
- A L Caetano
- Department of Physiological Sciences, Santa Casa de Sao Paulo School of Medical Sciences, Sao Paulo, SP CEP 01221-020, Brazil; Research Group on Neuropharmacology of Aging, Brazil
| | - K E Dong-Creste
- Department of Physiological Sciences, Santa Casa de Sao Paulo School of Medical Sciences, Sao Paulo, SP CEP 01221-020, Brazil; Research Group on Neuropharmacology of Aging, Brazil
| | - F A Amaral
- Department of Physiological Sciences, Santa Casa de Sao Paulo School of Medical Sciences, Sao Paulo, SP CEP 01221-020, Brazil
| | - K C Monteiro-Silva
- Department of Physiological Sciences, Santa Casa de Sao Paulo School of Medical Sciences, Sao Paulo, SP CEP 01221-020, Brazil
| | - J B Pesquero
- Department of Biophysics, Federal University of Sao Paulo, São Paulo, SP CEP 04021-001, Brazil
| | - M S Araujo
- Department of Biochemistry, Federal University of Sao Paulo, São Paulo, SP CEP 04021-001, Brazil
| | - W R Montor
- Department of Physiological Sciences, Santa Casa de Sao Paulo School of Medical Sciences, Sao Paulo, SP CEP 01221-020, Brazil
| | - T A Viel
- School of Arts, Sciences and Humanities and Graduation Course on Pharmacology at Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, SP CEP 03828-080, Brazil; Research Group on Neuropharmacology of Aging, Brazil
| | - H S Buck
- Department of Physiological Sciences, Santa Casa de Sao Paulo School of Medical Sciences, Sao Paulo, SP CEP 01221-020, Brazil; Research Group on Neuropharmacology of Aging, Brazil
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Caetano AL, Gonçalves F, Sousa JP, Cachada A, Pereira E, Duarte AC, Ferreira da Silva E, Pereira R. Characterization and validation of a Portuguese natural reference soil to be used as substrate for ecotoxicological purposes. ACTA ACUST UNITED AC 2012; 14:925-36. [DOI: 10.1039/c2em10827e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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