1
|
Lima BHM, Cartarozzi LP, Kyrylenko S, Ferreira RS, Barraviera B, Oliveira ALR. Embryonic stem cells overexpressing high molecular weight FGF2 isoform enhance recovery of pre-ganglionic spinal root lesion in combination with fibrin biopolymer mediated root repair. Stem Cell Res Ther 2024; 15:63. [PMID: 38438875 PMCID: PMC10913678 DOI: 10.1186/s13287-024-03676-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 02/21/2024] [Indexed: 03/06/2024] Open
Abstract
BACKGROUND Spinal ventral root avulsion results in massive motoneuron degeneration with poor prognosis and high costs. In this study, we compared different isoforms of basic fibroblast growth factor 2 (FGF2), overexpressed in stably transfected Human embryonic stem cells (hESCs), following motor root avulsion and repair with a heterologous fibrin biopolymer (HFB). METHODS In the present work, hESCs bioengineered to overexpress 18, 23, and 31 kD isoforms of FGF2, were used in combination with reimplantation of the avulsed roots using HFB. Statistical analysis was conducted using GraphPad Prism software with one-way or two-way ANOVA, followed by Tukey's or Dunnett's multiple comparison tests. Significance was set at *p < 0.05, **p < 0.01, ***p < 0.001, and ****p < 0.0001. RESULTS For the first set of experiments, rats underwent avulsion of the ventral roots with local administration of HFB and engraftment of hESCs expressing the above-mentioned FGF2 isoforms. Analysis of motoneuron survival, glial reaction, and synaptic coverage, two weeks after the lesion, indicated that therapy with hESCs overexpressing 31 kD FGF2 was the most effective. Consequently, the second set of experiments was performed with that isoform, so that ventral root avulsion was followed by direct spinal cord reimplantation. Motoneuron survival, glial reaction, synaptic coverage, and gene expression were analyzed 2 weeks post-lesion; while the functional recovery was evaluated by the walking track test and von Frey test for 12 weeks. We showed that engraftment of hESCs led to significant neuroprotection, coupled with immunomodulation, attenuation of astrogliosis, and preservation of inputs to the rescued motoneurons. Behaviorally, the 31 kD FGF2 - hESC therapy enhanced both motor and sensory recovery. CONCLUSION Transgenic hESCs were an effective delivery platform for neurotrophic factors, rescuing axotomized motoneurons and modulating glial response after proximal spinal cord root injury, while the 31 kD isoform of FGF2 showed superior regenerative properties over other isoforms in addition to the significant functional recovery.
Collapse
Affiliation(s)
- B H M Lima
- Department of Structural and Functional Biology, Laboratory of Nerve Regeneration, Institute of Biology, University of Campinas, Campinas, 13083-862, SP, Brazil
| | - L P Cartarozzi
- Department of Structural and Functional Biology, Laboratory of Nerve Regeneration, Institute of Biology, University of Campinas, Campinas, 13083-862, SP, Brazil
| | - S Kyrylenko
- Biomedical Research Center, Medical Institute of Sumy State University, Sumy, 40018, Ukraine
| | - R S Ferreira
- Center for the Study of Venoms and Venomous Animals (CEVAP), São Paulo State University (UNESP), Botucatu, 18610-307, SP, Brazil
| | - B Barraviera
- Center for the Study of Venoms and Venomous Animals (CEVAP), São Paulo State University (UNESP), Botucatu, 18610-307, SP, Brazil
| | - Alexandre L R Oliveira
- Department of Structural and Functional Biology, Laboratory of Nerve Regeneration, Institute of Biology, University of Campinas, Campinas, 13083-862, SP, Brazil.
| |
Collapse
|
2
|
Sodré FF, Arowojolu IM, Canela MC, Ferreira RS, Fernandes AN, Montagner CC, Vidal C, Dias MA, Abate G, da Silva LC, Grassi MT, Bertoldi C, Fadini PS, Urban RC, Ferraz GM, Schio NS, Waldman WR. How natural and anthropogenic factors should drive microplastic behavior and fate: The scenario of Brazilian urban freshwater. Chemosphere 2023; 340:139813. [PMID: 37586495 DOI: 10.1016/j.chemosphere.2023.139813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 07/23/2023] [Accepted: 08/12/2023] [Indexed: 08/18/2023]
Abstract
Brazil maintains its position at the top of the global ranking of plastic producers, yet recycling efforts have been incipient. Recent data reveals an annual production of approximately 14 million tons of plastic waste, not accounting for the surge in the usage of plastic masks and related materials due to the COVID-19 pandemic. However, what remains largely unreported is that over half of post-consumer plastic packaging in Brazil is managed without any monitoring, and it remains unclear how this will contribute to the occurrence of plastic waste and microplastics in Brazilian freshwaters. This scenario requires the consideration of several other crucial factors. Studies have been carried out mainly in marine and estuarine waters, while data on freshwaters are lacking. Brazil has continental dimensions and the highest water availability on the planet, yet the demand for water is greatest in regions with medium to low supply. Many densely populated Brazilian urban areas face chronic flood problems, possess inadequate levels of wastewater treatment, and display inadequate solid waste management practices. Consequently, urban freshwater with tropical characteristics in Brazil presents an intriguing scenario and is complementary to the most commonly studied marine environments. In this study, we explore the nuances of pollution in Brazilian urban freshwater and discuss how various parameters, such as organic matter, suspended solids, temperature, and pH, among others, influence the behavior of microplastics and their interactions with organic and inorganic contaminants. Furthermore, we address how microplastic conditions, such as biofouling, the type of plastic, or degradation level, may impact their behavior. By analyzing how these conditions change, we propose priority themes for investigating the occurrence of microplastics in Brazilian urban freshwater systems under different degrees of human impact. Ultimately, this study aims to establish a network dedicated to standardized monitoring of microplastic pollution in Brazilian urban freshwaters.
Collapse
Affiliation(s)
- Fernando F Sodré
- Institute of Chemistry, University of Brasília, Brasília, DF, Brazil.
| | - Imisi M Arowojolu
- Institute of Chemistry, University of Brasília, Brasília, DF, Brazil
| | - Maria C Canela
- Exact Sciences and Technology Center, State University of the North Fluminense Darcy Ribeiro, Campos Dos Goytacazes, RJ, Brazil
| | - Rodrigo S Ferreira
- Exact Sciences and Technology Center, State University of the North Fluminense Darcy Ribeiro, Campos Dos Goytacazes, RJ, Brazil
| | - Andreia N Fernandes
- Institute of Chemistry, Federal University of Rio Grande Do Sul, Porto Alegre, RS, Brazil
| | | | - Cristiane Vidal
- Institute of Chemistry, University of Campinas, Campinas, SP, Brazil
| | - Mariana A Dias
- Institute of Chemistry, University of Campinas, Campinas, SP, Brazil
| | - Gilberto Abate
- Chemistry Department, Federal University of Paraná, PR, Brazil
| | | | - Marco T Grassi
- Chemistry Department, Federal University of Paraná, PR, Brazil
| | - Crislaine Bertoldi
- Institute of Chemistry, Federal University of Rio Grande Do Sul, Porto Alegre, RS, Brazil; Chemistry Department, Federal University of Paraná, PR, Brazil
| | - Pedro S Fadini
- Chemistry Department, Federal University of São Carlos, São Carlos, SP, Brazil
| | - Roberta C Urban
- Chemistry Department, Federal University of São Carlos, São Carlos, SP, Brazil
| | - Gabriel M Ferraz
- Chemistry Department, Federal University of São Carlos, São Carlos, SP, Brazil
| | - Natalí S Schio
- Chemistry Department, Federal University of São Carlos, São Carlos, SP, Brazil
| | - Walter R Waldman
- Science and Technology Center for Sustainability, Federal University of São Carlos, Sorocaba, SP, Brazil
| |
Collapse
|
3
|
Alencar DSM, Alves TFA, Lima FWS, Ferreira RS, Alves GA, Macedo-Filho A. Droplet finite-size scaling of the majority-vote model on scale-free networks. Phys Rev E 2023; 108:014308. [PMID: 37583232 DOI: 10.1103/physreve.108.014308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 07/07/2023] [Indexed: 08/17/2023]
Abstract
We discuss the majority vote model coupled with scale-free networks and investigate its critical behavior. Previous studies point to a nonuniversal behavior of the majority vote model, where the critical exponents depend on the connectivity. At the same time, the effective dimension D_{eff} is unity for a degree distribution exponent 5/2<γ<7/2. We introduce a finite-size theory of the majority vote model for uncorrelated networks and present generalized scaling relations with good agreement with Monte Carlo simulation results. Our finite-size approach has two sources of size dependence: an external field representing the influence of the mass media on consensus formation and the scale-free network cutoff. The critical exponents are nonuniversal, dependent on the degree distribution exponent, precisely when 5/2<γ<7/2. For γ≥7/2, the model is in the same universality class as the majority vote model on Erdős-Rényi random graphs. However, for γ=7/2, the critical behavior includes additional logarithmic corrections.
Collapse
Affiliation(s)
- D S M Alencar
- Departamento de Física, Universidade Federal do Piauí, 57072-970 Teresina - PI, Brazil
| | - T F A Alves
- Departamento de Física, Universidade Federal do Piauí, 57072-970 Teresina - PI, Brazil
| | - F W S Lima
- Departamento de Física, Universidade Federal do Piauí, 57072-970 Teresina - PI, Brazil
| | - R S Ferreira
- Departamento de Ciências Exatas e Aplicadas, Universidade Federal de Ouro Preto, 35931-008 João Monlevade - MG, Brazil
| | - G A Alves
- Departamento de Física, Universidade Estadual do Piauí, 64002-150 Teresina - PI, Brazil
| | - A Macedo-Filho
- Departamento de Física, Universidade Estadual do Piauí, 64002-150 Teresina - PI, Brazil
| |
Collapse
|
4
|
Neves LJ, Junior AAL, Correa MF, Silva IP, Neto VT, Coracin FL, Villela NC, Ferreira RS, Lopes LF, Macari KSM. ALTERAÇÃO BUCAL EM PACIENTE PORTADOR DE LEUCEMIA MIELOMONOCÍTICA JUVENIL - RELATO DE CASO. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.770] [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: 11/26/2022] Open
|
5
|
Junior AAL, Macari KSM, Corrêa MF, Lima EM, Coracin FL, Neto VT, Ferreira RS, Villela NC, Lopes LF, Neves LJ. DOENÇA DO ENXERTO CONTRA O HOSPEDEIRO CRÔNICA ORAL EM PACIENTE SUBMETIDO A TRANSPLANTE DE CÉLULAS-TRONCO HEMATOPOIÉTICAS HAPLOIDÊNTICO: RELATO DE CASO. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.477] [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: 11/26/2022] Open
|
6
|
Nunes NN, Ferreira RS, de Sá LF, de Oliveira AEA, Oliva MLV. A novel cysteine proteinase inhibitor from seeds of Enterolobium contortisiliquum and its effect on Callosobruchus maculatus larvae. Biochem Biophys Rep 2021; 25:100876. [PMID: 33364447 PMCID: PMC7750491 DOI: 10.1016/j.bbrep.2020.100876] [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: 07/22/2020] [Revised: 10/14/2020] [Accepted: 12/07/2020] [Indexed: 11/28/2022] Open
Abstract
This study focused on the characterization of a novel cysteine proteinase inhibitor from Enterolobium contortisiliquum seeds targeting the inhibition of the growth of Callosobruchus maculatus larvae, an important cosmopolitan pest of the cowpea Vigna unguiculata during storage. The inhibitor was isolated by ion-exchange besides of size exclusion chromatography. EcCI molecular mass is 19,757 Da, composed of two polypeptide chains. It strongly inhibits papain (Kiapp 0.036 nM) and proteinases from the midguts of C. maculatus (80 μg mL-1, 60% inhibition). The inhibitory activity is reduced by 40% after a heat treatment at 100 °C for 2 h. The protein displayed noxious activity at 0.5% and 1% (w/w) when incorporated in artificial seeds, reducing larval mass in 87% and 92%, respectively. Treatment of C. maculatus larvae with conjugated EcCI-FIT and subsequent biodistribution resulted in high fluorescence intensity in midguts and markedly low intensity in malpighian tubules and fat body. Small amounts of labeled proteins were detected in larvae feces. The detection of high fluorescence in larvae midguts and low fluorescence in their feces indicate the retention of the FITC conjugated EcCI inhibitor in larvae midguts. These results demonstrate the potential of the natural protein from E. contortisiliquum to inhibit the development of C. maculatus.
Collapse
Affiliation(s)
- Natalia N.S. Nunes
- Biochemistry Department, Universidade Federal de São Paulo-UNIFESP, 04044-020, São Paulo, SP, Brazil
| | - Rodrigo S. Ferreira
- Biochemistry Department, Universidade Federal de São Paulo-UNIFESP, 04044-020, São Paulo, SP, Brazil
| | - Leonardo F.R. de Sá
- Chemistry Laboratory on Chemistry and Function of Proteins and Peptides, Biosciences and Biotechnology Center, CBB, Universidade Estadual do Norte Fluminense Darcy Ribeiro -UENF, Campos dos Goytacazes, RJ, Brazil
| | - Antônia Elenir A. de Oliveira
- Chemistry Laboratory on Chemistry and Function of Proteins and Peptides, Biosciences and Biotechnology Center, CBB, Universidade Estadual do Norte Fluminense Darcy Ribeiro -UENF, Campos dos Goytacazes, RJ, Brazil
| | - Maria Luiza V. Oliva
- Biochemistry Department, Universidade Federal de São Paulo-UNIFESP, 04044-020, São Paulo, SP, Brazil
| |
Collapse
|
7
|
Abstract
To date, extensive effort has been devoted toward the characterization of protein interactions with synthetic nanostructures. However, much remains to be understood, particularly concerning microscopic mechanisms of interactions. Here, we have conducted a detailed investigation of the kinetics of nanoparticle-protein complexation to gain deeper insights into the elementary steps and molecular events along the pathway for complex formation. Toward that end, the binding kinetics between p-mercaptobenzoic acid-coated ultrasmall gold nanoparticles (AuMBA) and fluorescently-labeled ubiquitin was investigated at millisecond time resolution using stopped-flow spectroscopy. It was found that both the association and dissociation kinetics consisted of multiple exponential phases, hence suggesting a complex, multi-step reaction mechanism. The results fit into a picture where complexation proceeds through the formation of a weakly-bound first-encounter complex with an apparent binding affinity (KD) of ∼9 μM. Encounter complex formation is followed by unimolecular tightening steps of partial desolvation/ion removal and conformational rearrangement, which, collectively, achieve an almost 100-fold increase in affinity of the final bound state (apparent KD ∼0.1 μM). The final state is found to be weakly stabilized, displaying an average lifetime in the range of seconds. Screening of the electrostatic forces at high ionic strength weakens the AuMBA-ubiquitin interactions by destabilizing the encounter complex, whereas the average lifetime of the final bound state remains largely unchanged. Overall, our rapid kinetics investigation has revealed novel quantitative insights into the molecular-level mechanisms of ultrasmall nanoparticle-protein interactions.
Collapse
Affiliation(s)
- Rodrigo S Ferreira
- Department of Biochemistry, Federal University of São Paulo, São Paulo, SP 04044-020, Brazil.
| | - André L Lira
- Department of Biochemistry, Federal University of São Paulo, São Paulo, SP 04044-020, Brazil.
| | - Alioscka A Sousa
- Department of Biochemistry, Federal University of São Paulo, São Paulo, SP 04044-020, Brazil.
| |
Collapse
|
8
|
Abstract
Nanomaterials displaying well-tailored sizes and surface chemistries can provide novel ways with which to modulate the structure and function of enzymes. Recently, we showed that gold nanoparticles (AuNPs) in the ultrasmall size regime could perform as allosteric effectors inducing partial inhibition of thrombin activity. We now find that the nature of the AuNP surface chemistry controls the interactions to the anion-binding exosites 1 and 2 on the surface of thrombin, the allosterically induced changes to the active-site conformation, and, by extension, the enzymatic activity. Ultrasmall AuNPs passivated with p-mercaptobenzoic acid ligands (AuMBA) and a peptide-based (Ac-ECYN) biomimetic coat (AuECYN) were utilized in our investigations. Remarkably, we found that while AuMBA binds to exosites 1 and 2, AuECYN interacts primarily with exosite 2. It was further established that AuMBA behaves as a "mild denaturant" of thrombin leading to catalytic dysfunction over time. Conversely, AuECYN resembles a proper allosteric effector leading to partial and reversible inhibition of the activity. Collectively, our findings reveal how the distinct binding modes of different AuNP types may uniquely influence thrombin structure and catalysis. The present study further contributes to our understanding of how synthetic nanomaterials could be exploited in the allosteric regulation of enzymes.
Collapse
Affiliation(s)
- André L Lira
- Department of Biochemistry, Federal University of São Paulo, São Paulo, SP 04044-020, Brazil
| | - Rodrigo S Ferreira
- Department of Biochemistry, Federal University of São Paulo, São Paulo, SP 04044-020, Brazil
| | - Maria Luiza V Oliva
- Department of Biochemistry, Federal University of São Paulo, São Paulo, SP 04044-020, Brazil
| | - Alioscka A Sousa
- Department of Biochemistry, Federal University of São Paulo, São Paulo, SP 04044-020, Brazil
| |
Collapse
|
9
|
Ferreira RS, Brito MV, Napoleão TH, Silva MCC, Paiva PMG, Oliva MLV. Effects of two protease inhibitors from Bauhinia bauhinoides with different specificity towards gut enzymes of Nasutitermes corniger and its survival. Chemosphere 2019; 222:364-370. [PMID: 30710762 DOI: 10.1016/j.chemosphere.2019.01.108] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 01/16/2019] [Accepted: 01/20/2019] [Indexed: 06/09/2023]
Abstract
Two recombinant protease inhibitors from Bauhinia bauhinioides, rBbKI (kallikrein inhibitor) and rBbCI (cruzipain inhibitor) were evaluated for insecticidal activity against workers and soldiers of Nasutitermes corniger (order: Isoptera; family: Termitidae) through the inhibitors' effect on the insect's gut enzymes. The inhibitor rBbKI was more effective than rBbCI in inhibiting the termite's gut enzymes. The kallikrein inhibitor showed termiticidal activity in workers with an LC50 of 0.9 mg mL-1 after 4 days. Conversely, rBbKI did not affect the survival of soldiers and rBbCI did not show termiticidal activity against N. corniger. The two inhibitors showed different specificity towards the termite's gut enzymes, representing interesting tools to characterize N. corniger enzymes. The different effects of rBbKI and rBbCI on the termite's enzymes and survival may be linked to slight structural differences between these inhibitors.
Collapse
Affiliation(s)
- R S Ferreira
- Biochemistry Department at the Federal University of São Paulo, 04044-020, São Paulo, SP, Brazil
| | - M V Brito
- Biochemistry Department at the Federal University of São Paulo, 04044-020, São Paulo, SP, Brazil
| | - T H Napoleão
- Biochemistry Department at the Federal University of Pernambuco, 50670-420, Recife, PE, Brazil
| | - M C C Silva
- Biochemistry Department at the Federal University of São Paulo, 04044-020, São Paulo, SP, Brazil
| | - P M G Paiva
- Biochemistry Department at the Federal University of Pernambuco, 50670-420, Recife, PE, Brazil
| | - M L V Oliva
- Biochemistry Department at the Federal University of São Paulo, 04044-020, São Paulo, SP, Brazil.
| |
Collapse
|
10
|
Lira AL, Ferreira RS, Torquato RJS, Oliva MLV, Schuck P, Sousa AA. Allosteric inhibition of α-thrombin enzymatic activity with ultrasmall gold nanoparticles. Nanoscale Adv 2019; 1:378-388. [PMID: 30931428 PMCID: PMC6394888 DOI: 10.1039/c8na00081f] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 09/21/2018] [Indexed: 05/20/2023]
Abstract
The catalytic activity of enzymes can be regulated by interactions with synthetic nanoparticles (NPs) in a number of ways. To date, however, the potential use of NPs as allosteric effectors has not been investigated in detail. Importantly, targeting allosteric (distal) sites on the enzyme surface could afford unique ways to modulate the activity, allowing for either enzyme activation, partial or full inhibition. Using p-mercaptobenzoic acid-coated ultrasmall gold NPs (AuMBA) and human α-thrombin as a model system, here we experimentally tested the hypothesis that enzyme activity could be regulated through ultrasmall NP interactions at allosteric sites. We show that AuMBA interacted selectively and reversibly around two positively charged regions of the thrombin surface (exosites 1 and 2) and away from the active site. NP complexation at the exosites transmitted long-range structural changes over to the active site, altering both substrate binding affinity and catalysis. Significantly, thrombin activity was partially reduced - but not completely inhibited - by interactions with AuMBA. These findings indicate that interactions of proteins with ultrasmall NPs may mimic a typical biomolecular complexation event, and suggest the prospect of using ultrasmall particles as synthetic receptors to allosterically regulate protein function.
Collapse
Affiliation(s)
- André L Lira
- Department of Biochemistry , Federal University of São Paulo , São Paulo , SP , Brazil .
| | - Rodrigo S Ferreira
- Department of Biochemistry , Federal University of São Paulo , São Paulo , SP , Brazil .
| | - Ricardo J S Torquato
- Department of Biochemistry , Federal University of São Paulo , São Paulo , SP , Brazil .
| | - Maria Luiza V Oliva
- Department of Biochemistry , Federal University of São Paulo , São Paulo , SP , Brazil .
| | - Peter Schuck
- National Institute of Biomedical Imaging and Bioengineering , National Institutes of Health , Bethesda , MD , USA
| | - Alioscka A Sousa
- Department of Biochemistry , Federal University of São Paulo , São Paulo , SP , Brazil .
| |
Collapse
|
11
|
Lira AL, Ferreira RS, Torquato RJS, Zhao H, Oliva MLV, Hassan SA, Schuck P, Sousa AA. Binding kinetics of ultrasmall gold nanoparticles with proteins. Nanoscale 2018; 10:3235-3244. [PMID: 29383361 PMCID: PMC5842697 DOI: 10.1039/c7nr06810g] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Synthetic ultrasmall nanoparticles (NPs) can be designed to interact with biologically active proteins in a controlled manner. However, the rational design of NPs requires a clear understanding of their interactions with proteins and the precise molecular mechanisms that lead to association/dissociation in biological media. Although much effort has been devoted to the study of the kinetics mechanism of protein corona formation on large NPs, the nature of NP-protein interactions in the ultrasmall regime is radically different and poorly understood. Using a combination of experimental and computational approaches, we studied the interactions of a model protein, CrataBL, with ultrasmall gold NPs passivated with p-mercaptobenzoic acid (AuMBA) and glutathione (AuGSH). We have identified this system as an ideal in vitro platform to understand the dependence of binding affinity and kinetics on NP surface chemistry. We found that the structural and chemical complexity of the passivating NP layer leads to quite different association kinetics, from slow and reaction-limited (AuGSH) to fast and diffusion-limited (AuMBA). We also found that the otherwise weak and slow AuGSH-protein interactions measured in buffer solution are enhanced in macromolecular crowded solutions. These findings advance our mechanistic understanding of biomimetic NP-protein interactions in the ultrasmall regime and have implications for the design and use of NPs in the crowded conditions common to all biological media.
Collapse
Affiliation(s)
- André L Lira
- Department of Biochemistry, Federal University of São Paulo, São Paulo, SP, Brazil.
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Pereira AG, Bernardi UCS, Manhães VC, Ferreira RS, Miranda FD. Cross-amplification and characterization of microsatellite markers in Alcantarea patriae Versieux & Wand. Genet Mol Res 2017; 16:gmr-16-02-gmr.16029692. [PMID: 28613383 DOI: 10.4238/gmr16029692] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The Alcantarea patriae is a Bromeliaceae endemic to the inselbergs of the Atlantic Forest. This taxon, described in the year of 2007 by Versieux & Wanderley, presents restricted and fragmented distribution outside conservation units. Studies to evaluate the genetic structure of its populations can contribute to the conservation and management strategies for the species. In this study, 31 microsatellite markers, descriptive to six different Bromeliaceae species, were evaluated by cross-amplification tests in 20 individuals of A. patriae. The individuals were collected in the district of Vila Cruzeiro, in the municipality of Jerônimo Monteiro. Twelve markers were polymorphic and 10 monomorphic, with an amplification success rate of 71%. The displayed polymorphism information content was considered high, indicating that the selected markers are informative. The values found for the fixation index were positive and indicated the occurrence of inbreeding. The mean number of alleles was 4.66 (3-6), the mean expected and observed heterozygosities were 0.6605 and 0.4618, respectively. The detection of polymorphic markers was important for future studies of diversity and genetic structuring of natural populations and for germplasm bank creation aiming to contribute to in situ and ex situ conservations of A. patriae.
Collapse
Affiliation(s)
- A G Pereira
- Programa de Pós-Graduação em Genética e Melhoramento, Laboratório de Bioquímica e Biologia Molecular, Centro de Ciências Agrárias e Engenharias, Universidade Federal do Espírito Santo, Alegre, ES, Brasil
| | - U C S Bernardi
- Programa de Pós-Graduação em Genética, Conservação e Biologia Evolutiva, Laboratório de Genética e Reprodução de Plantas, , , Brasil
| | - V C Manhães
- Departamento de Botânica, Museu Nacional, , , Brasil
| | - R S Ferreira
- Programa de Pós-Graduação em Genética, Conservação e Biologia Evolutiva, Laboratório de Genética e Reprodução de Plantas, , , Brasil
| | - F D Miranda
- Departamento de Biologia, Centro de Ciências Exatas Naturais e da Saúde, Universidade Federal do Espírito Santo, Alegre, ES, Brasil
| |
Collapse
|
13
|
Ferreira RS, de Souza Morelini L, de Azeredo EMC, Vieira ECS, Ferreira EB, da Silva VSN, Tavano OL, Azevedo L. The impact of laboratory chow for rats in the experiments: Chemical and biological evaluation of nine grain-based diet options. Hum Exp Toxicol 2017; 37:275-284. [DOI: 10.1177/0960327117695637] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cereal-based diets formulated as semi-purified diets can provide flexibility for researchers, enabling open controlled formulas, besides being cheaper than purified diets. Seeking to widen the researchers’ options in their experimental design developments, we aimed at assaying the chemical score, growth performance and protein utilization of nine semi-purified experimental chows. These diets were formulated at 17.8%, 12% and 8% protein contents, using three variations of ingredients for each one, as follows: casein (C), casein+soybean meal (C+S, 1:1 w/w protein) and casein+soybean meal+corn gluten meal (C+S+G, 1:1:1 w/w protein), without cysteine supplementation and setting casein 17.8% (AIN-93G) as reference diet. The diets C and C+S (17.8%) had the Cys as the limiting amino acid once the addition of gluten turns the Lys as second limiting. All diets had the potential for promoting growth with body mass gain, feed conversion ratio (FCR; chow consumed per body weight gain, average 3.12) and feed efficiency ratio (FER; body weight gain per chow consumed, average 0.3), except for C+S+G 8% (FCR = 6 g; FER = 0.13). These variations were mainly due to the protein amounts independently from the protein ingredient used and could characterize the C+S+G 8% as unable to support growth. For the other parameters (digestibility, net protein ratio, net protein utilization and protein efficiency ratio), there were no relevant differences between the diets. We can conclude that 17.8%, 12% and 8% chows (C and C+S) allowed a proper combination of ingredients from the point of view of palatability, nutrient availability/utilization, metabolic processes, growth performance and feed utilization parameters.
Collapse
Affiliation(s)
- RS Ferreira
- Alfenas Federal University, UNIFAL-MG, Brazil
| | | | | | | | - EB Ferreira
- Alfenas Federal University, UNIFAL-MG, Brazil
| | | | - OL Tavano
- Alfenas Federal University, UNIFAL-MG, Brazil
| | - L Azevedo
- Alfenas Federal University, UNIFAL-MG, Brazil
| |
Collapse
|
14
|
Abstract
We describe the phenomenon of localization in the epidemic susceptible-infective-susceptible model on highly heterogeneous networks in which strongly connected nodes (hubs) play the role of centers of localization. We find that in this model the localized states below the epidemic threshold are metastable. The longevity and scale of the metastable outbreaks do not show a sharp localization transition; instead there is a smooth crossover from localized to delocalized states as we approach the epidemic threshold from below. Analyzing these long-lasting local outbreaks for a random regular graph with a hub, we show how this localization can be detected from the shape of the distribution of the number of infective nodes.
Collapse
Affiliation(s)
- R S Ferreira
- Departamento de Ciências Exatas e Aplicadas, Universidade Federal de Ouro Preto, 35931-008 João Monlevade, Brazil
| | - R A da Costa
- Department of Physics & I3N, University of Aveiro, 3810-193 Aveiro, Portugal
| | - S N Dorogovtsev
- Department of Physics & I3N, University of Aveiro, 3810-193 Aveiro, Portugal.,A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia
| | - J F F Mendes
- Department of Physics & I3N, University of Aveiro, 3810-193 Aveiro, Portugal
| |
Collapse
|
15
|
Oliveira JS, Ferreira RS, Santos LM, Marin LJ, Corrêa RX, Luizon MR, Simões AL, Gadelha SR, Sousa SMB. Self-declared ethnicity and genomic ancestry in prostate cancer patients from Brazil. Genet Mol Res 2016; 15:gmr-15-gmr15048769. [PMID: 27813577 DOI: 10.4238/gmr15048769] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Some studies of polymorphisms in prostate cancer (PCa) analyze individuals in a uniform manner, regardless of genetic ancestry. However, PCa aggressiveness differs between subjects of African descent and those of European extraction. Thus, genetic ancestry analysis may be used to detect population stratification in case-control association studies. We genotyped 11 ancestry informative markers to estimate the contributions of African, European, and Amerindian ancestries in a case-control sample of 213 individuals from Bahia State, Northeast Brazil, including 104 PCa patients. We compared this data with self-reported ancestry and the stratification of cases by PCa aggressiveness according to Gleason score. A larger African genetic contribution (44%) was detected among cases, and a greater European contribution (61%) among controls. Self-declaration data revealed that 74% of PCa patients considered themselves non-white (black and brown), and 41.3% of controls viewed themselves as white. Our data showed a higher degree of European ancestry among fast-growing cancer cases than those of intermediate and slow development. This differs from many previous studies, in which the prevalence of African ancestry has been reported for all grades. Differences were observed between degrees of PCa aggressiveness in terms of genetic ancestry. In particular, the greater European contribution among patients with high-grade PCa indicates that a population's genetic structure can influence case-control studies. This investigation contributes to our understanding of the genetic basis of tumor aggressiveness among groups of different genetic ancestries, especially admixed populations, and has significant implications for the assessment of inter-population heterogeneity in drug treatment effects.
Collapse
Affiliation(s)
- J S Oliveira
- Departamento de Ciências Biológicas, Universidade Estadual do Sudoeste da Bahia, Jequié, BA, Brasil
| | - R S Ferreira
- Instituto de Biologia, Universidade Federal da Bahia, Salvador, BA, Brasil
| | - L M Santos
- Instituto Federal da Bahia, Vitória da Conquista, BA, Brasil
| | - L J Marin
- Departamento de Ciências da Saúde, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brasil
| | - R X Corrêa
- Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brasil
| | - M R Luizon
- Departamento de Farmacologia, Instituto de Biociências, Universidade Estadual Paulista Júlio de Mesquita Filho, Botucatu, SP, Brasil
| | - A L Simões
- Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - S R Gadelha
- Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brasil
| | - S M B Sousa
- Departamento de Ciências Naturais, Universidade Estadual do Sudoeste da Bahia, Vitória da Conquista, BA, Brasil
| |
Collapse
|
16
|
Silva-Júnior EF, Silva EPS, França PHB, Silva JPN, Barreto EO, Silva EB, Ferreira RS, Gatto CC, Moreira DRM, Siqueira-Neto JL, Mendonça-Júnior FJB, Lima MCA, Bortoluzzi JH, Scotti MT, Scotti L, Meneghetti MR, Aquino TM, Araújo-Júnior JX. Design, synthesis, molecular docking and biological evaluation of thiophen-2-iminothiazolidine derivatives for use against Trypanosoma cruzi. Bioorg Med Chem 2016; 24:4228-4240. [PMID: 27475533 DOI: 10.1016/j.bmc.2016.07.013] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [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: 06/14/2016] [Revised: 07/06/2016] [Accepted: 07/08/2016] [Indexed: 01/17/2023]
Abstract
In this study, we designed and synthesized a series of thiophen-2-iminothiazolidine derivatives from thiophen-2-thioureic with good anti-Trypanosoma cruzi activity. Several of the final compounds displayed remarkable trypanocidal activity. The ability of the new compounds to inhibit the activity of the enzyme cruzain, the major cysteine protease of T. cruzi, was also explored. The compounds 3b, 4b, 8b and 8c were the most active derivatives against amastigote form, with significant IC50 values between 9.7 and 6.03μM. The 8c derivative showed the highest potency against cruzain (IC50=2.4μM). Molecular docking study showed that this compound can interact with subsites S1 and S2 simultaneously, and the negative values for the theoretical energy binding (Eb=-7.39kcal·mol(-1)) indicates interaction (via dipole-dipole) between the hybridized sulfur sp(3) atom at the thiazolidine ring and Gly66. Finally, the results suggest that the thiophen-2-iminothiazolidines synthesized are important lead compounds for the continuing battle against Chagas disease.
Collapse
Affiliation(s)
- E F Silva-Júnior
- Medicinal Chemistry Laboratory, Pharmacy and Nursing School, Federal University of Alagoas, Maceio, Brazil
| | - E P S Silva
- Medicinal Chemistry Laboratory, Pharmacy and Nursing School, Federal University of Alagoas, Maceio, Brazil
| | - P H B França
- Medicinal Chemistry Laboratory, Pharmacy and Nursing School, Federal University of Alagoas, Maceio, Brazil
| | - J P N Silva
- Cell Biology Laboratory, Federal University of Alagoas, Maceio, Brazil
| | - E O Barreto
- Cell Biology Laboratory, Federal University of Alagoas, Maceio, Brazil
| | - E B Silva
- Biochemistry and Immunology Department, Biological Sciences Institute, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - R S Ferreira
- Biochemistry and Immunology Department, Biological Sciences Institute, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - C C Gatto
- Inorganic Synthesis and Crystallography Laboratory, Institute of Chemistry, University of Brasilia, Federal District, Brazil
| | - D R M Moreira
- Tissue Engineering and Immunopharmacology Laboratory, Oswaldo Cruz Foundation, Salvador, Bahia, Brazil
| | - J L Siqueira-Neto
- Skaggs School of Pharmacy and Pharmaceutical Sciences, California, San Diego La Jolla, United States
| | - F J B Mendonça-Júnior
- Laboratory of Drug Synthesis and Delivery, Biological Sciences Department, State University of Paraiba, Campus V, João Pessoa, Brazil
| | - M C A Lima
- Drug Design and Synthesis Laboratory, National Science and Technology Institute for Pharmaceutical Innovation, Federal University of Pernambuco, Recife, Brazil
| | - J H Bortoluzzi
- Catalysis and Chemical Reactivity Group (GCaR), Institute of Chemistry and Biotechnology, Federal University of Alagoas, Maceio, Brazil
| | - M T Scotti
- Laboratory of Drug Synthesis and Delivery, Biological Sciences Department, State University of Paraiba, Campus V, João Pessoa, Brazil
| | - L Scotti
- Laboratory of Drug Synthesis and Delivery, Biological Sciences Department, State University of Paraiba, Campus V, João Pessoa, Brazil
| | - M R Meneghetti
- Catalysis and Chemical Reactivity Group (GCaR), Institute of Chemistry and Biotechnology, Federal University of Alagoas, Maceio, Brazil
| | - T M Aquino
- Medicinal Chemistry Laboratory, Pharmacy and Nursing School, Federal University of Alagoas, Maceio, Brazil.
| | - J X Araújo-Júnior
- Medicinal Chemistry Laboratory, Pharmacy and Nursing School, Federal University of Alagoas, Maceio, Brazil
| |
Collapse
|
17
|
Nunes NNS, Ferreira RS, Silva-Lucca RA, de Sá LFR, de Oliveira AEA, Correia MTDS, Paiva PMG, Wlodawer A, Oliva MLV. Potential of the Lectin/Inhibitor Isolated from Crataeva tapia Bark (CrataBL) for Controlling Callosobruchus maculatus Larva Development. J Agric Food Chem 2015; 63:10431-6. [PMID: 26568149 PMCID: PMC6290478 DOI: 10.1021/acs.jafc.5b03634] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Callosobruchus maculatus is an important predator of cowpeas. Due to infestation during storage, this insect affects the quality of seed and crop yield. This study aimed to investigate the effects of CrataBL, a multifunction protein isolated from Crataeva tapia bark, on C. maculatus larva development. The protein, which is stable even in extreme pH conditions, showed toxic activity, reducing the larval mass 45 and 70% at concentrations of 0.25 and 1.0% (w/w), respectively. Acting as an inhibitor, CrataBL decreased by 39% the activity of cysteine proteinases from larval gut. Conversely, the activity of serine proteinases was increased about 8-fold. The toxic properties of CrataBL may also be attributed to its capacity of binding to glycoproteins or glycosaminoglycans. Such binding interferes with larval metabolism, because CrataBL-FITC was found in the fat body, Malpighian tubules, and feces of larvae. These results demonstrate the potential of this protein for controlling larva development.
Collapse
Affiliation(s)
- Natalia N. S. Nunes
- Departamento de Bioquímica, Universidade Federal de São Paulo-UNIFESP-EPM, 04044-020, São Paulo-SP, Brazil
| | - Rodrigo S. Ferreira
- Departamento de Bioquímica, Universidade Federal de São Paulo-UNIFESP-EPM, 04044-020, São Paulo-SP, Brazil
| | - Rosemeire A. Silva-Lucca
- Centro de Engenharia e Ciências Exatas, Universidade Estadual do Oeste do Paraná, Toledo, Paraná, Brazil
| | - Leonardo F. R. de Sá
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia-CBB, Universidade Estadual do Norte Fluminense Darcy Ribeiro-UENF, Campos dos Goytacazes- RJ, Brazil
| | - Antônia Elenir A. de Oliveira
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia-CBB, Universidade Estadual do Norte Fluminense Darcy Ribeiro-UENF, Campos dos Goytacazes- RJ, Brazil
| | | | | | - Alexander Wlodawer
- Macromolecular Crystallography Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA
| | - Maria Luiza V. Oliva
- Departamento de Bioquímica, Universidade Federal de São Paulo-UNIFESP-EPM, 04044-020, São Paulo-SP, Brazil
| |
Collapse
|
18
|
Salu BR, Ferreira RS, Brito MV, Ottaiano TF, Cruz JWMC, Silva MCC, Correia MTS, Paiva PMG, Maffei FHA, Oliva MLV. CrataBL, a lectin and Factor Xa inhibitor, plays a role in blood coagulation and impairs thrombus formation. Biol Chem 2015; 395:1027-35. [PMID: 25153385 DOI: 10.1515/hsz-2014-0127] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 06/25/2014] [Indexed: 12/24/2022]
Abstract
Arterial thrombosis is an important complication of diabetes and cancer, being an important target for therapeutic intervention. Crataeva tapia bark lectin (CrataBL) has been previously shown to have hypoglycemiant effect and also to induce cancer cell apoptosis. It also showed inhibitory activity against Factor Xa (Kiapp=8.6 μm). In the present study, we evaluated the anti-thrombotic properties of CrataBL in arterial thrombosis model. CrataBL prolongs the activated partial thromboplastin time on human and mouse plasma, and it impairs the heparin-induced potentiation of antithrombin III and heparin-induced platelet activation in the presence of low-dose ADP. It is likely that the dense track of positive charge on CrataBL surface competes with the heparin ability to bind to antithrombin III and to stimulate platelets. In the photochemically induced thrombosis model in mice, in the groups treated with 1.25, 5.0, or 10 mg/kg CrataBL, prior to the thrombus induction, the time of total artery occlusion was prolonged by 33.38%, 65%, and 66.11%, respectively, relative to the time of the control group. In contrast to heparin, the bleeding time in CrataBL-treated mice was no longer than in the control. In conclusion, CrataBL was effective in blocking coagulation and arterial thrombus formation, without increasing bleeding time.
Collapse
|
19
|
Zhang F, Walcott B, Zhou D, Gustchina A, Lasanajak Y, Smith DF, Ferreira RS, Correia MTS, Paiva PMG, Bovin NV, Wlodawer A, Oliva MLV, Linhardt RJ. Structural studies of the interaction of Crataeva tapia bark protein with heparin and other glycosaminoglycans. Biochemistry 2013; 52:2148-56. [PMID: 23448527 DOI: 10.1021/bi400077b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
CrataBL, a protein isolated from Crataeva tapia bark, which is both a serine protease inhibitor and a lectin, has been previously shown to exhibit a number of interesting biological properties, including anti-inflammatory, analgesic, antitumor, and insecticidal activities. Using a glycan array, we have now shown that only sulfated carbohydrates are effectively bound by CrataBL. Because this protein was recently shown to delay clot formation by impairing the intrinsic pathway of the coagulation cascade, we considered that its natural ligand might be heparin. Heparin is a glycosaminoglycan (GAG) that interacts with a number of proteins, including thrombin and antithrombin III, which have a critical, essential pharmacological role in regulating blood coagulation. We have thus employed surface plasmon resonance to improve our understanding of the binding interaction between the heparin polysaccharide and CrataBL. Kinetic analysis shows that CrataBL displays strong heparin binding affinity (KD = 49 nM). Competition studies using different size heparin-derived oligosaccharides showed that the binding of CrataBL to heparin is chain length-dependent. Full chain heparin with 40 saccharides or large oligosaccharides, having 16-18 saccharide residues, show strong binding affinity for CrataBL. Heparin-derived disaccharides through tetradecasaccharides show considerably lower binding affinity. Other highly sulfated GAGs, including chondroitin sulfate E and dermatan 4,6-disulfate, showed CrataBL binding affinity comparable to that of heparin. Less highly sulfated GAGs, heparan sulfate, chondroitin sulfate A and C, and dermatan sulfate displayed modest binding affinity as did chondroitin sulfate D. Studies using chemically modified heparin show that N-sulfo and 6-O-sulfo groups on heparin are essential for CrataBL-heparin interaction.
Collapse
Affiliation(s)
- Fuming Zhang
- Departments of Chemical and Biological Engineering, Chemistry and Chemical Biology, Biology, and Biomedical Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Freitas-Junior R, Correa RS, Peixoto JE, Ferreira RS, Tanaka RMN. Abstract P3-01-07: ESTIMATED RISK OF RADIATION-INDUCED BREAST CANCER FROM MAMMOGRAPHIC SCREENING. Cancer Res 2012. [DOI: 10.1158/0008-5472.sabcs12-p3-01-07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Objective: Estimate the benefit–risk balance of mammography, as number of lives saved/lost in an opportunistic screening in the state of Goiás, Brazil, in 2010, according to type of technology available and age group indicated for screening.
Methods: The number of lives saved was estimated considering the gross mortality rate for breast cancer, female population living in the state, estimated mortality rate reduction due to screening programs, and mammographic coverage in the state. For number of lives lost, the model adopted by the Biological Effects of Ionizing Radiation (BEIR VII) was used. Based on the mean glandular tissue dose (Dg), the following parameters were calculated: number of radiation-induced cancer cases with one exposure, with several exposures in screening programs and over the lifetime, number of deaths caused by radiation-induced cancer at a certain age and over the lifetime. Dg of each equipment was estimated according to the European protocol, using the incident air kerma (Ki) at the simulator entrance and the half-value layer (HVL) of the X-ray beam, and table values of coefficients to convert Ki into Dg. Ki and HVL were measured in 100 equipments in operation in the state. A standard breast simulator (5.3 cm thickness and 50% glandular tissue) was used. We considered a biannual mammographic screening with an exam routine composed of a cranio-caudal and a mediolateral oblique view and 40–70 and 50–70-year age groups.
Results: The mean Dg was 4.28 (±1.06) and 6.61 (±3.67) for conventional and digital equipments, respectively (p < 0.001). A woman undergoing mammography at the age of 40 in a conventional equipment has a 0.243/100000 probability of radiation-induced cancer at the age of 60, whereas using a digital equipment, the probability is 0.375/100000. The number of cases of radiation-induced breast cancer over the lifetime and consequent deaths followed the differences in the doses employed according to type of technology (p < 0.001). The balance between lives saved and lost was 75.5 (1253.8/16.6) and 166.5 (849.4/5.1) for women screened at 40–70 and 50–70 years, respectively.
Conclusions: Screening among 50–70-year-olds, performed biannually using conventional equipments, presented more benefits regarding radiation protection. The number of cases of radiation-induced breast cancer and consequent deaths reproduces the same ratio observed for the difference in the doses between the types of technology.
Citation Information: Cancer Res 2012;72(24 Suppl):Abstract nr P3-01-07.
Collapse
Affiliation(s)
- R Freitas-Junior
- Federal University of Goias, Goiania, Goias, Brazil; Comissão Nacional de Energia Nuclear, Goiania, Goias, Brazil; National Cancer Institute of Brazil, Rio de Janeiro, RJ, Brazil; Superintendência de Vigilância em Saúde do Estado de Goias, Goiania, Goias, Brazil
| | - RS Correa
- Federal University of Goias, Goiania, Goias, Brazil; Comissão Nacional de Energia Nuclear, Goiania, Goias, Brazil; National Cancer Institute of Brazil, Rio de Janeiro, RJ, Brazil; Superintendência de Vigilância em Saúde do Estado de Goias, Goiania, Goias, Brazil
| | - J-E Peixoto
- Federal University of Goias, Goiania, Goias, Brazil; Comissão Nacional de Energia Nuclear, Goiania, Goias, Brazil; National Cancer Institute of Brazil, Rio de Janeiro, RJ, Brazil; Superintendência de Vigilância em Saúde do Estado de Goias, Goiania, Goias, Brazil
| | - RS Ferreira
- Federal University of Goias, Goiania, Goias, Brazil; Comissão Nacional de Energia Nuclear, Goiania, Goias, Brazil; National Cancer Institute of Brazil, Rio de Janeiro, RJ, Brazil; Superintendência de Vigilância em Saúde do Estado de Goias, Goiania, Goias, Brazil
| | - RMN Tanaka
- Federal University of Goias, Goiania, Goias, Brazil; Comissão Nacional de Energia Nuclear, Goiania, Goias, Brazil; National Cancer Institute of Brazil, Rio de Janeiro, RJ, Brazil; Superintendência de Vigilância em Saúde do Estado de Goias, Goiania, Goias, Brazil
| |
Collapse
|
21
|
Silva MC, Santana LA, Mentele R, Ferreira RS, de Miranda A, Silva-Lucca RA, Sampaio MU, Correia MT, Oliva ML. Purification, primary structure and potential functions of a novel lectin from Bauhinia forficata seeds. Process Biochem 2012. [DOI: 10.1016/j.procbio.2012.03.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
22
|
Ferreira RS, Almeida RAMB, Barraviera SRCS, Barraviera B. Historical perspective and human consequences of Africanized bee stings in the Americas. J Toxicol Environ Health B Crit Rev 2012; 15:97-108. [PMID: 22401177 DOI: 10.1080/10937404.2012.645141] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In 1956, Africanized bees began to spread in the American continent from southern Brazil, where original African bees mated with European bees. A few years later, in 1990, these Africanized bees reached the United States and were found in Texas. Currently, these hybrid bees are found in several North American states and will probably reach the Canadian border in the future. Although the presence of Africanized bees had produced positive effects on Brazilian economy, including improvement in crop pollination and in honey production, turning Brazil into a major exporter, the negative impacts-such as swarming, aggressive behavior, and the ability to mass attack-resulted in serious and fatal envenomation with humans and animals. Victims of bee attacks usually develop a severe envenomation syndrome characterized by the release of a large amount of cytokines [interleukins (IL) IL-1, IL-6, IL-8], and tumor necrosis factor (TNF). Subsequently, such cytokines produce an acute inflammatory response that triggers adverse effects on skeletal muscles; bone marrow; hepatic and renal functions; and cardiovascular, central nervous, and immune systems. Finally, the aim of the present review is to study historical characteristics and current status of Africanized bees' spread, the composition of their venom, the impact of the bees on the Brazilian economy and ecology, and clinical aspects of their stings including immune response, and to suggest a protocol for bee sting management since there is no safe and effective antivenom available.
Collapse
Affiliation(s)
- R S Ferreira
- Department of Tropical Diseases and Image Diagnosis, São Paulo State University (UNESP–Univ Estadual Paulista), São Paulo, Brazil.
| | | | | | | |
Collapse
|
23
|
Campagner MV, Bosco SMG, Bagagli E, Cunha MLRS, Jeronimo BC, Saad E, Biscola NP, Ferreira RS, Barraviera B. Microbiological evaluation of different strategies for management of snakes in captivity. J Toxicol Environ Health A 2012; 75:1070-1080. [PMID: 22852856 DOI: 10.1080/15287394.2012.697837] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Keeping snakes in captivity to produce venom for scientific research and production of inputs is now a worldwide practice. Maintaining snakes in captivity involves capture, infrastructure investments, management techniques, and appropriate qualified personnel. Further, the success of the project requires knowledge of habitat, nutrition, and reproduction, and control of opportunistic infections. This study evaluated the management of snakes in three types of captivity (quarantine, intensive, and semiextensive) and diagnosed bacterial and fungal contaminants. A bacteriological profile was obtained by swabbing the oral and cloacal cavities, scales, and venoms of healthy adult snakes from Bothrops jararaca (Bj) and Crotalus durissus terrificus (Cdt). There was predominance of Enterobacteriaceae, especially non-fermenting Gram-negative bacilli excluding Pseudomonas spp and Gram- positive bacteria. Statistically, intensive captivity resulted in the highest number of bacterial isolates, followed by recent capture (quarantine) and by semiextensive captivity. No statistical difference was found between Bj and Cdt bacterial frequency. In vitro bacterial susceptibility testing found the highest resistance against the semisynthetic penicillins (amoxicillin and ampicillin) and highest sensitivity to amicacin and tobramycin aminoglycosides. To evaluate mycological profile of snakes from intensive captivity, samples were obtained from two healthy Bj and one B. moojeni, one B. pauloensis, and one Cdt showing whitish lesions on the scales suggestive of ringworm. Using conventional methods and DNA-based molecular procedures, five samples of Trichosporon asahii were identified. Despite the traditional role of intense captivity in ophidian venom production, semiextensive captivity was more effective in the present study by virtue of presenting superior control of bacterial and fungal transmission, easier management, lowest cost, and decreased rate of mortality; therefore, it should be considered as a good alternative for tropical countries.
Collapse
Affiliation(s)
- M V Campagner
- Department of Tropical Diseases, Botucatu Medical School, São Paulo State University-UNESP-Univ Estadual Paulista, São Paulo State, Brazil
| | | | | | | | | | | | | | | | | |
Collapse
|
24
|
de Araújo RMS, Vaz AFM, Santos ME, Zingali RB, Coelho LCBB, Paiva PMG, Correia MTS, Oliva MLV, Ferreira RS. A new exogen anticoagulant with high selectivity to intrinsic pathway of coagulation. Thromb Res 2011; 128:395-7. [PMID: 21752431 DOI: 10.1016/j.thromres.2011.06.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 05/29/2011] [Accepted: 06/07/2011] [Indexed: 10/17/2022]
|
25
|
Ferreira RS, Moraes JC, Antunes CS. Silicon influence on resistance induction against Bemisia tabaci biotype B (Genn.) (Hemiptera: Aleyrodidae) and on vegetative development in two soybean cultivars. Neotrop Entomol 2011; 40:495-500. [PMID: 21952968 DOI: 10.1590/s1519-566x2011000400014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2010] [Accepted: 04/03/2011] [Indexed: 05/06/2023]
Abstract
The potential of populations of Bemisia tabaci (Genn.) to become resistant to insecticides has stimulated research into alternative tactics of integrated pest management such as the induction of host-plant resistance. Recent data have shown that silicon can increase the degree of resistance of host plants to insect pests. Therefore the aim of our work was to study the effects of silicon application on the vegetative development of soybean plants and on the induction of resistance to the silverleaf whitefly, B. tabaci biotype B. We performed choice and no-choice tests of oviposition preference on two soybean cultivars, IAC-19 (moderately resistant to B. tabaci biotype B) and MONSOY-8001 (susceptible), with and without application of silicon. Silicon did not affect silverleaf whitefly oviposition preferences, but caused significant mortality in nymphs. Thus, silicon increased the degree of resistance to silverleaf whitefly. Silicon decreased the production of phenolic compounds, but did not affect lignin production. However, when applied to cultivar IAC-19, it increased the production of non-protein organic nitrogen. Silicon had no effect on the vegetative development of soybean plants, but it increased the degree of resistance to the silverleaf whitefly. We conclude that silicon applications combined with cultivar IAC-19 can significantly decrease silverleaf whitefly populations, having a positive impact both on the soybean plant and on the environment.
Collapse
Affiliation(s)
- R S Ferreira
- Departamento de Entomologia, Universidade Federal de Lavras, Lavras, MG, Brasil.
| | | | | |
Collapse
|
26
|
Ferreira RS, Levi d'Ancona CA, Dantas-Filho VP, Rodrigues Netto N, Miyaoka R. [Percutaneous radiofrequency sacral rhizotomy in the treatment of neurogenic detrusor overactivity in spinal cord injured patients]. Actas Urol Esp 2011; 35:325-30. [PMID: 21477886 DOI: 10.1016/j.acuro.2010.12.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Accepted: 12/11/2010] [Indexed: 11/19/2022]
Abstract
INTRODUCTION To evaluate the effects of percutaneous radiofrequency sacral rhizotomy in spinal cord injured (SCI) patients on urodynamic parameters (maximum cystometric capacity - MCC and detrusor pressure at maximum cystometric capacity - PdetMCC). MATERIAL AND METHODS This prospective study assessed eight patients with SCI (four men and four women) with a mean age of 31.3years (22 to 41). Mean interval period between spinal cord lesion and rhizotomy was 53.5 months (20 to 96). All patients underwent an anesthetic block of the 3rd sacral root bilaterally using 0.5% bupivacaine under fluoroscopic control. Those who responded with an increase on bladder capacity were selected to undergo the percutaneous radiofrequency sacral rhizotomy. All patients underwent urodynamic evaluation at 6 and 12 months following the procedure. MCC and P(det)MCC were recorded. RESULTS All patients presented a significant improvement on MCC after 12 months. The mean vesical volume increased from 100.2±57.1 to 282.9±133.4ml (p<0.05). The P(det)MCC reduced from 82.4±31.7 to 69.9±28.7cmH(2)O (p=0.2). Three patients with autonomic dysreflexia had complete relief of symptoms after the procedure. At 12 months, recurrence of detrusor hyperactivity was observed in all patients. One patient presented abolishment of reflex erections after the procedure. No major complications related to the rhizotomy were noted. CONCLUSIONS Percutaneous radiofrequency sacral rhizotomy is a minimally invasive technique with low morbidity able to increase MCC. There is a trend towards the reduction of the P(det)MCC in SCI patients at 12 months, although statistical significance was not reached.
Collapse
Affiliation(s)
- R S Ferreira
- Departamento de Urología, Hospital General de Goiânia, Goiânia - GO, Brasil
| | | | | | | | | |
Collapse
|
27
|
Coelho JS, Santos NDL, Napoleão TH, Gomes FS, Ferreira RS, Zingali RB, Coelho LCBB, Leite SP, Navarro DMAF, Paiva PMG. Effect of Moringa oleifera lectin on development and mortality of Aedes aegypti larvae. Chemosphere 2009; 77:934-938. [PMID: 19747711 DOI: 10.1016/j.chemosphere.2009.08.022] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Revised: 08/10/2009] [Accepted: 08/15/2009] [Indexed: 05/28/2023]
Abstract
Aedes aegypti larvae have developed tolerance to many insecticides used for mosquito control. Moringa oleifera seeds contain a water-soluble lectin (WSMoL) and this paper reports the effect of M. oleifera seed extracts (MoE(1-15)) and WSMoL on development and survival of A. aegypti larvae. WSMoL peptide from in-gel trypsin digestion is also described. MoE(1-15) showed hemagglutinating activity and WSMoL had similarity with flocculating proteins from M. oleifera seeds. MoE(1) and MoE(3) delayed larval development which stopped in the third instar (L3) in MoE(6) and MoE(15). Significant (p<0.0001) larval mortality was only detected in MoE(15). Native WSMoL showed larvicidal activity (LC(50) 0.197 mg mL(-1)) and heated lectin, without hemagglutinating activity, did not kill fourth instar (L4) larvae. Optical microscopy showed that live L4 from MoE(1) presented underlying epithelium, increased gut lumen and hypertrophic segments; dead L4 from WSMoL were absent of underlying epithelium, had increased gut lumen and hypertrophic segments. The presence of hemagglutinating activity in the extracts suggests that soluble lectin promotes the delay of larval development and mortality; furthermore, the absence of larvicidal activity in heat-denatured WSMoL strengthens the involvement of lectin in this activity mechanism.
Collapse
Affiliation(s)
- Juliene S Coelho
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Pernambuco, Cidade Universitária, 50670-420 Recife, Pernambuco, Brazil
| | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Barros LC, Ferreira RS, Barraviera SRCS, Stolf HO, Thomazini-Santos IA, Mendes-Giannini MJS, Toscano E, Barraviera B. A new fibrin sealant from Crotalus durissus terrificus venom: applications in medicine. J Toxicol Environ Health B Crit Rev 2009; 12:553-571. [PMID: 20183534 DOI: 10.1080/10937400903442514] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Fibrin sealant, a widely available tissue adhesive, has been used since 1940 in a variety of clinical applications. Commercially available fibrin sealant products are synthesized from bovine thrombin and human fibrinogen, which may transmit infectious diseases, and recipients may also develop antibodies against bovine thrombin. Bearing these disadvantages in mind, a new fibrin sealant was developed in 1989 by a group of researchers from the Center for the Study of Venoms and Venomous Animals, in Sao Paulo State, Brazil. The main purpose was to produce an adhesive fibrin without using human blood, to avoid transmitting infectious diseases. The components of this novel sealant were extracted from large animals and a serine proteinase extracted from Crotalus durissus terrificus snake venom. The applicability of this sealant was tested in animals and humans with beneficial results. The new fibrin sealant can be a useful tool clinically due to its flexibility and diversity of applications. This sealant is a biological and biodegradable product that (1) does not produce adverse reactions, (1) contains no human blood, (3) has a good adhesive capacity, (4) gives no transmission of infectious diseases, and (5) may be used as an adjuvant in conventional suture procedures. The effectiveness of this new fibrin sealant is reviewed and its development and employment are described.
Collapse
Affiliation(s)
- L C Barros
- Centro de Estudos de Venenos e Animais Peçonhentos, Universidade Estadual Paulista, UNESP, Botucatu, São Paulo State, Brasil
| | | | | | | | | | | | | | | |
Collapse
|
29
|
Silva CA, Gomes MT, Ferreira RS, Rodrigues KC, Val CG, Lopes MT, Mello VJ, Salas CE. A mitogenic protein fraction in latex from Carica candamarcensis. Planta Med 2003; 69:926-932. [PMID: 14648396 DOI: 10.1055/s-2003-45102] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Latex from Caricaceae contains a number of proteins believed to be part of a defense mechanism that protects these plants from wounding. Prior evidence suggests that some components in Carica papaya improve healing of ulcerous wounds in mammals. This study shows the chromatographic isolation of a protein fraction from C. candamarcensis that stimulates cell proliferation of mammalian cells by measuring MTT reduction and thymidine incorporation. The effect appears to be cell specific as L929, MDA-MB231 and BHK-21 cells are stimulated while no effect is seen on CHO cells. The maximal stimulatory effect reaches 2.2-fold 72 h after addition of the active fraction to L929, 1.8-fold in MDA-MB231 cells and 1.6-fold in BHK cells. Proteolytic inactivation of the active fraction suggests that a protein is responsible for the proliferative activity and its size is estimated between 10 and 25 kDa. A potential candidate for this function is a 23 kDa protein found in the fraction that reacts with human EGF antibody.
Collapse
Affiliation(s)
- C A Silva
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, UFMG, Belo Horizonte, Brasil
| | | | | | | | | | | | | | | |
Collapse
|
30
|
Massara CL, Ferreira RS, Guerra HL, Carvalho ODS. In vitro study on thiabendazole action on viability of Ascaris lumbricoides (Lineu, 1758) eggs. Rev Soc Bras Med Trop 2001; 34:319-22. [PMID: 11562723 DOI: 10.1590/s0037-86822001000400002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The in vitro activity of thiabendazole on Ascaris lumbricoides eggs, which were recovered from uteri of worm excreted after chemotherapeutic treatment, was studied. Four concentrations of the drug were used: 1 - 2.5 - 5 - and 10 ppm during 24, 48 and 72 hours of exposure. Subsequently, the eggs were centrifuged, washed three times and H(2)SO(4)0.1N was added. The eggs were maintained in an incubator for 20 days at 28 degrees C. Finally, the percentage of embryonated eggs was determined under a lightmicroscope at a 100X magnification. After 48 and 72 hours of thiabendazole exposure, at a concentration of 10ppm, the drug showed complete inhibition of egg embryonation.
Collapse
Affiliation(s)
- C L Massara
- Laboratório de Helmintoses Intestinais, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, MG, Brasil.
| | | | | | | |
Collapse
|
31
|
Campello TR, Ferreira RS, Pires ML, De Melo PG, Albuquerque R, Araujo S, Dreyer G. A study of placentas from Wuchereria bancrofti microfilaraemic and amicrofilaraemic mothers. J Trop Med Hyg 1993; 96:251-5. [PMID: 8345547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The prevalence of transplacental transfer of microfilariae and structural lesions in the placentas of amicrofilaraemic (n = 10) and Wuchereria bancrofti microfilaraemic (n = 10) pregnant women from the prenatal care unit of the Hospital das Clinicas, Recife, Brazil, was investigated. Study participants were selected by filtration (3 microns/13 mm) of nocturnal (2300-0100 h) venous blood. A detailed histopathological examination was performed to detect abnormalities in the placenta, the cord and the foetal membranes. Both study groups had similar obstetric profiles. Parasitaemia was present during labour in nine of ten microfilaraemic women, but no microfilariae were found by filtration of 5-10 ml cord blood. No macroscopic abnormalities were seen in placentas from microfilaraemic mothers; two placentas from the amicrofilaraemic cases contained, respectively, infarcted areas and cysts at the cut surface. Microscopy failed to detect microfilariae in the intervillous spaces, chorionic and decidual vessels, or the umbilical cord. Thus, transplacental transfer of Wuchereria bancrofti microfilariae seems to be a rare phenomenon, and microfilaraemia does not appear to be a risk factor for placental pathology.
Collapse
Affiliation(s)
- T R Campello
- Departamento de Patologia da Universidade Federal de Pernambuco, Recife, Brazil
| | | | | | | | | | | | | |
Collapse
|
32
|
Pires ML, Ferreira RS, Araújo S, Albuquerque R, Remigio Neto J, Da Silva AS, Dreyer G. [Transplacental passage of Wuchereria bancrofti microfilariae in newborns of microfilaremic mothers]. Rev Inst Med Trop Sao Paulo 1991; 33:91-5. [PMID: 1844389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The occurrence of circulating Wuchereria bancrofti microfilariae was investigated in 304 pregnant women from the "Unidade Mista Pof. Barros Lima" and "Hospital das Clínicas/UFPE". The filtration technique was employed to detect microfilaraemia during pregnancy, and 13 women were found to be positive (4.2%). The investigation of microfilariae in the cord blood of their children was negative (6/13), and also in venous blood samples collected up to 72 hours after birth and with 6 months of life. Milk samples from these mothers also had no microfilariae. The authors suggest that the occurrence of placentary lesions may be a possible factor involved in the transplacental transfer of microfilariae, and that in utero exposure to microfilariae and/or filarial antigens may influence the response to a filarial infection acquired later, thus being important a clinical and laboratorial follow-up of children exposed previously to filarial antigens during early periods of human development.
Collapse
Affiliation(s)
- M L Pires
- Centro de Pesquisas Aggeu Magalhães (CPqAM), FIOCRUZ, Recife, Brasil
| | | | | | | | | | | | | |
Collapse
|