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Tavares Costa M, Ribeiro AS, Oliveira Almeida D, Ochoa-Leite C. Pneumococcal vaccination in a northern Portugal health centre during COVID-19 pandemic. Semergen 2022; 48:293-294. [PMID: 35491376 PMCID: PMC8801971 DOI: 10.1016/j.semerg.2022.01.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 01/21/2022] [Indexed: 11/28/2022]
Affiliation(s)
- M Tavares Costa
- Unidade de Saúde Familiar Monte Crasto, ACeS Gondomar, ARS Norte, Portugal.
| | - A S Ribeiro
- Unidade de Saúde Familiar Monte Crasto, ACeS Gondomar, ARS Norte, Portugal
| | | | - C Ochoa-Leite
- IPO Porto - Instituto Português de Oncologia do Porto Francisco Gentil, Porto, Portugal; FMUP - Faculdade de Medicina, Universidade do Porto, Porto, Portugal
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2
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Paz AA, Condori XPH, Hofmann AA, Soares T, Predebon V, Siqueira VR, Dortzbacher F, Calvache ET, Gomes CF, Portich JP, Ribeiro AS. SARS-COV-2 INDUCED REMISSION OF DIFFUSE LARGE B-CELL LYMPHOMA: A CASE REPORT. Hematol Transfus Cell Ther 2021. [PMCID: PMC8530663 DOI: 10.1016/j.htct.2021.10.175] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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3
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Barbeta TY, Ludwig MV, Paz AA, Lamaison DB, Soares TB, Ferrelli RS, Portich JP, Ribeiro AS, Siqueira VR, Predebon V. DOENÇA POR IGG4. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.075] [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: 10/20/2022] Open
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4
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Calvache ET, Portich JP, Ribeiro AS, Dortzbacher F, Condori XH, Lamaison DB, Silva LLA, Barbeta TY, Hofmann AA, Paz AA. LEUCEMIA MIELÓIDE AGUDA RELACIONADA A TERAPIA COM COMPROMETIMENTO EXTRAMEDULAR SINCRÔNICO APÓS TCTH ALOGÊNICO. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.281] [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: 10/20/2022] Open
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5
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Barbeta TY, Bittencourt RI, Paz AA, Silva LLA, Ferrelli RS, Lamaison DB, Hofmann AA, Calvache ET, Ribeiro AS, Portich JP. AMILOIDOSE AL, APRESENTAÇÃO RARA E DESAFIO DIAGNÓSTICO. Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.320] [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: 10/20/2022] Open
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6
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Lamaison DB, Barbeta TY, Soares TB, Burin MM, Ribeiro AS, Areias LL, Hofmann AA, Siqueira VR, Trindade MN, Paz AA. LINFOMA/LEUCEMIA LINFOBLÁSTICA AGUDA T GAMMA/DELTA (δ). Hematol Transfus Cell Ther 2021. [DOI: 10.1016/j.htct.2021.10.283] [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: 10/20/2022] Open
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7
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Sousa JA, Batista E, Demeyer S, Fischer N, Pellegrino O, Ribeiro AS, Martins LL. Uncertainty calculation methodologies in microflow measurements: Comparison of GUM, GUM-S1 and Bayesian approach. Measurement (Lond) 2021; 181:109589. [PMID: 36540695 PMCID: PMC9756327 DOI: 10.1016/j.measurement.2021.109589] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 04/10/2021] [Accepted: 05/10/2021] [Indexed: 06/17/2023]
Abstract
The importance of measurement quality cannot be over emphasized in medical applications, as one is dealing with life issues and the wellbeing of society, from oncology to new-borns, and more recently to patients of the COVID-19 pandemic. In all these dire situations, the accuracy of fluid delivered according to a prescribed dose can be critical. Microflow applications are growing in importance for a wide variety of scientific fields, namely drug development and administration, Organ-on-a-Chip, or bioanalysis, but accurate and reliable measurements are a tough challenge in micro-to-femto flow operating ranges, from 2.78 × 10-4 mL/s down to 2.78 × 10-7 mL/s (1000 μL/h down to 1 μL/h). Several sources of error have been established such as the mass measurement, the fluid evaporation dependent on the gravimetric methodology implemented, the tube adsorption and the repeatability, believed to be closely related to the operating mode of the stepper motor and drive screw pitch of a syringe pump. In addition, the difficulty in dealing with microflow applications extends to the evaluation of measurement uncertainty which will qualify the quality of measurement. This is due to the conditions entailed when measuring very small values, close to zero, of a quantity such as the flow rate which is inherently positive. Alternative methods able to handle these features were developed and implemented, and their suitability will be discussed.
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Affiliation(s)
- J A Sousa
- IPQ - Portuguese Institute for Quality, 2829-513 Caparica, Portugal
| | - E Batista
- IPQ - Portuguese Institute for Quality, 2829-513 Caparica, Portugal
| | - S Demeyer
- LNE - Laboratoire National de Métrologie et d'Essais, 75724 Paris, France
| | - N Fischer
- LNE - Laboratoire National de Métrologie et d'Essais, 75724 Paris, France
| | - O Pellegrino
- IPQ - Portuguese Institute for Quality, 2829-513 Caparica, Portugal
| | - A S Ribeiro
- LNEC - National Laboratory for Civil Engineering, 1700-513 Lisboa, Portugal
| | - L L Martins
- LNEC - National Laboratory for Civil Engineering, 1700-513 Lisboa, Portugal
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8
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Pazin WM, Almeida AKA, Manzoni V, Dias JMM, de Abreu ACF, Navarro M, Ito AS, Ribeiro AS, de Oliveira IN. Thermal and solvatochromic effects on the emission properties of a thienyl-based dansyl derivative. RSC Adv 2020; 10:28484-28491. [PMID: 35520094 PMCID: PMC9055963 DOI: 10.1039/d0ra05949h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 07/16/2020] [Indexed: 12/22/2022] Open
Abstract
Environmental conditions have a profound effect on the photophysical behavior of highly conjugated compounds, which can be exploited in a large variety of applications. In this context, we use a combination of experimental and computational methods to investigate thermal and solvatochromic effects on the fluorescence properties of a dansyl derivative bearing a thienyl substituent, namely 2-(3-thienyl)ethyl dansylglycinate (TEDG). In particular, we analyze how the solvent polarity and temperature affect the ground and excited state energies of TEDG by using time-resolved and steady-state fluorescence techniques. We determine the changes in dipole moment of the TEDG molecule upon photoexcitation, as well as the solvent polarity effects on the excited state lifetime. Besides, we provide theoretical modeling of the HOMO–LUMO orbitals and the vertical absorption and emission energies using time-dependent density functional theory (TDDFT) as well as the polarizable continuum model (PCM) to include the solvent contribution to the absorption and emission energies. Our results show that the emission mechanism of TEDG involves locally excited states derived from hybrid molecular orbitals, accompanied by a moderate variation of the molecular dipole moment upon light excitation. Our findings demonstrate that TEDG exhibits desirable fluorescence properties that make it a promising candidate for use as a photoactive material in electrochromic, optical thermometry, and thermography applications. We use a combination of experimental and computational methods to investigate thermal and solvatochromic effects on the fluorescence properties of a dansyl derivative bearing a thienyl substituent, 2-(3-thienyl)ethyl dansylglycinate (TEDG).![]()
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Affiliation(s)
- W M Pazin
- Departamento de Física, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo Ribeirão Preto, SP 14040-901 Brazil.,Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Estadual Paulista Presidente Prudente, SP 19060-900 Brazil
| | - A K A Almeida
- Instituto de Química e Biotecnologia, Universidade Federal de Alagoas Maceió AL 57072-970 Brazil
| | - V Manzoni
- Instituto de Física, Universidade Federal de Alagoas Maceió AL 57072-970 Brazil
| | - J M M Dias
- Departamento de Química Fundamental, CCEN, Universidade Federal de Pernambuco Recife PE 50670-901 Brazil
| | - A C F de Abreu
- Instituto de Física, Universidade Federal de Alagoas Maceió AL 57072-970 Brazil .,Instituto Federal do Piauí, Campus Angical Angical PI 64410-000 Brazil
| | - M Navarro
- Departamento de Química Fundamental, CCEN, Universidade Federal de Pernambuco Recife PE 50670-901 Brazil
| | - A S Ito
- Departamento de Física, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo Ribeirão Preto, SP 14040-901 Brazil
| | - A S Ribeiro
- Instituto de Química e Biotecnologia, Universidade Federal de Alagoas Maceió AL 57072-970 Brazil
| | - I N de Oliveira
- Instituto de Física, Universidade Federal de Alagoas Maceió AL 57072-970 Brazil
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9
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Carvalho R, Paredes J, Ribeiro AS. Impact of breast cancer cells´ secretome on the brain metastatic niche remodeling. Semin Cancer Biol 2019; 60:294-301. [PMID: 31711993 DOI: 10.1016/j.semcancer.2019.10.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 10/11/2019] [Accepted: 10/16/2019] [Indexed: 02/07/2023]
Abstract
Brain metastases occur in approximately 10-20% of patients with metastatic breast cancer showing a very poor overall survival. Curiously, different molecular subtypes (that show specific gene expression signatures and differential prognostic significance) are associated with different risks for brain metastases development, suggesting that cancer cells harbor specific molecular programs that award them intrinsic advantages to survive in this specific foreign tissue. Emerging data has been revealing that biophysical and/or mechanical properties of the brain extracellular matrix (ECM), along with those of the brain resident cells, play a crucial role in creating the best conditions for survival, colonization and outgrowth of breast cancer cells in this distinct microenvironment. Although several reports show that cancer cells modulate metastatic niches way before they reach the target organ, few data exist for the brain metastatic niche. Indeed, little is known concerning how factors secreted by cancer cells activate brain resident cells and/or modify brain ECM biomechanical properties and how these modifications impact cells´ ability to metastasize the brain. The brain is a particular organ, protected by the blood brain barrier (BBB), and containing exclusive functional units and very special cell types. Additionally, it is the organ with the most singular ECM and biomechanical properties. Thus, this cancer cell-brain metastatic niche interaction must present distinct properties. Consequently, the search for putative molecular markers that modulate the brain pre-metastatic niche, thus promoting the successful metastatic homing of cancer cells, is urgently needed. In this review, we will discuss key aspects regarding breast cancer cells and the brain pre-metastatic niche paracrine communication that is crucial to initiate the metastatic cascade. We will focus on cancer cell`s secretome influence into the brain microenvironment, specifically on its impact on tissue mechanics and on brain resident cells as regulators of the pre-metastatic niche formation, ultimately promoting metastatic colonization.
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Affiliation(s)
| | - J Paredes
- i3S/IPATIMUP, 4200-135, Porto, Portugal
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10
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Tomeleri CM, Ribeiro AS, Cavaglieri CR, Deminice R, Schoenfeld BJ, Schiavoni D, Dos Santos L, de Souza MF, Antunes M, Venturini D, Barbosa DS, Sardinha LB, Cyrino ES. Correlations between resistance training-induced changes on phase angle and biochemical markers in older women. Scand J Med Sci Sports 2018; 28:2173-2182. [PMID: 29858504 DOI: 10.1111/sms.13232] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/28/2018] [Indexed: 01/02/2023]
Abstract
The main purpose of this study was to investigate the effects of 12 weeks of resistance training (RT) on phase angle (PhA), inflammatory and oxidative stress biomarkers, and to evaluate whether these RT-induced adaptations are related to PhA changes. Fifty-one older women (70.6 ± 5.1 years; 26.9 ± 4.2 kg/m2 ) were randomly allocated into a training group (TG) that performed 12-week RT or a nonexercising control group (CG). The PhA (Xitron), body composition (DXA), and blood sample measurements (after a 12 hours fast) were performed before and after the intervention. The TG showed a significant (P < .05) increase in PhA (TG: +7.4±5.9% vs CG: -3.6 ± 8.8%), and interleukin-10 (IL-10; TG: +51.8 ± 71.1% vs CG: -46.6 ± 38.0%), and a decrease in tumor necrosis factor alpha (TNF-α; TG: -15.2 ± 11.1% vs CG: +6.9±17.7%), interleukin-6 (IL-6; TG: -17.9 ± 17.8% vs CG: +6.1 ± 24.8%), and C-reactive protein (CRP; TG: -24.1 ± 19.9% vs CG: +43.8 ± 31.1%). Moreover, TG upregulated catalase (TG: +11.4 ± 15.0% vs CG: -6.7 ± 10.2%). Changes in TNF-α (r = -.71), CRP (r = -.65), lower advanced oxidation protein products (r = -.55), and catalase (r = +.73) after RT were correlated with changes in PhA (P < .05). These results suggest that RT improves PhA, inflammatory and oxidative stress biomarkers, and the changes in inflammatory and oxidative damage markers are correlated with changes in PhA.
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Affiliation(s)
- C M Tomeleri
- Metabolism, Nutrition, and Exercise Laboratory, Londrina State University, Londrina, Brazil.,Exercise Physiology Laboratory, Faculty of Physical Education, University of Campinas-Unicamp, Campinas, Brazil
| | - A S Ribeiro
- Metabolism, Nutrition, and Exercise Laboratory, Londrina State University, Londrina, Brazil.,Center for Research in Health Sciences, University of Northern Parana, Londrina, Brazil
| | - C R Cavaglieri
- Exercise Physiology Laboratory, Faculty of Physical Education, University of Campinas-Unicamp, Campinas, Brazil
| | - R Deminice
- Department of Physical Education, Faculty of Physical Education and Sport, State University of Londrina, Londrina, PR, Brazil
| | - B J Schoenfeld
- Exercise Science Department, CUNY Lehman College, Bronx, New York
| | - D Schiavoni
- Metabolism, Nutrition, and Exercise Laboratory, Londrina State University, Londrina, Brazil
| | - L Dos Santos
- Metabolism, Nutrition, and Exercise Laboratory, Londrina State University, Londrina, Brazil
| | - M F de Souza
- Metabolism, Nutrition, and Exercise Laboratory, Londrina State University, Londrina, Brazil.,Department of Physical Education, Federal University of Vale do São Francisco, Petrolina, Brazil
| | - M Antunes
- Metabolism, Nutrition, and Exercise Laboratory, Londrina State University, Londrina, Brazil
| | - D Venturini
- Clinical Analyses Laboratory, Londrina State University, Londrina, Brazil
| | - D S Barbosa
- Clinical Analyses Laboratory, Londrina State University, Londrina, Brazil
| | - L B Sardinha
- Exercise and Health Laboratory, Faculdade Motricidade Humana, CIPER, Universidade de Lisboa, Lisbon, Portugal
| | - E S Cyrino
- Metabolism, Nutrition, and Exercise Laboratory, Londrina State University, Londrina, Brazil.,Department of Physical Education, Faculty of Physical Education and Sport, State University of Londrina, Londrina, PR, Brazil
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11
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Kalk NJ, Guo Q, Owen D, Cherian R, Erritzoe D, Gilmour A, Ribeiro AS, McGonigle J, Waldman A, Matthews P, Cavanagh J, McInnes I, Dar K, Gunn R, Rabiner EA, Lingford-Hughes AR. Decreased hippocampal translocator protein (18 kDa) expression in alcohol dependence: a [ 11C]PBR28 PET study. Transl Psychiatry 2017; 7:e996. [PMID: 28072413 PMCID: PMC5545729 DOI: 10.1038/tp.2016.264] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2016] [Revised: 11/02/2016] [Accepted: 11/13/2016] [Indexed: 01/05/2023] Open
Abstract
Repeated withdrawal from alcohol is clinically associated with progressive cognitive impairment. Microglial activation occurring during pre-clinical models of alcohol withdrawal is associated with learning deficits. We investigated whether there was microglial activation in recently detoxified alcohol-dependent patients (ADP), using [11C]PBR28 positron emission tomography (PET), selective for the 18kDa translocator protein (TSPO) highly expressed in activated microglia and astrocytes. We investigated the relationship between microglial activation and cognitive performance. Twenty healthy control (HC) subjects (45±13; M:F 14:6) and nine ADP (45±6, M:F 9:0) were evaluated. Dynamic PET data were acquired for 90 min following an injection of 331±15 MBq [11C]PBR28. Regional volumes of distribution (VT) for regions of interest (ROIs) identified a priori were estimated using a two-tissue compartmental model with metabolite-corrected arterial plasma input function. ADP had an ~20% lower [11C]PBR28 VT, in the hippocampus (F(1,24) 5.694; P=0.025), but no difference in VT in other ROIs. Hippocampal [11C]PBR28 VT was positively correlated with verbal memory performance in a combined group of HC and ADP (r=0.720, P<0.001), an effect seen in HC alone (r=0.738; P=0.001) but not in ADP. We did not find evidence for increased microglial activation in ADP, as seen pre-clinically. Instead, our findings suggest lower glial density or an altered activation state with lower TSPO expression. The correlation between verbal memory and [11C]PBR28 VT, raises the possibility that abnormalities of glial function may contribute to cognitive impairment in ADP.
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Affiliation(s)
- N J Kalk
- National Addictions Centre, Institute of Psychiatry, Psychology and Neuroscience, Kings College London, London, UK,National Addictions Centre, Institute of Psychiatry, Psychology and Neuroscience, Kings College London, 4 Windsor Walk, London SE5 8BB, UK. E-mail:
| | - Q Guo
- Neuroimaging Department, Kings College London, London, UK,Centre for Neuropsychopharmacology, Imperial College London, London, UK
| | - D Owen
- Division of Brain Sciences, Imperial College London, London, UK
| | - R Cherian
- West London Mental Health NHS Trust, London, UK
| | - D Erritzoe
- Centre for Neuropsychopharmacology, Imperial College London, London, UK
| | - A Gilmour
- Centre for Infection, Inflammation and Immunity, University of Glasgow, Glasgow, UK
| | - A S Ribeiro
- Centre for Neuropsychopharmacology, Imperial College London, London, UK
| | - J McGonigle
- Centre for Neuropsychopharmacology, Imperial College London, London, UK
| | - A Waldman
- Division of Brain Sciences, Imperial College London, London, UK
| | - P Matthews
- Division of Brain Sciences, Imperial College London, London, UK
| | - J Cavanagh
- Institute of Health and Well-being, University of Glasgow, Glasgow, UK
| | - I McInnes
- Centre for Infection, Inflammation and Immunity, University of Glasgow, Glasgow, UK
| | - K Dar
- Central and North West London NHS Trust, London, UK
| | - R Gunn
- Imanova Limited, London, UK
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12
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Ribeiro AS, Carvalho FA, Figueiredo J, Carvalho R, Mestre T, Monteiro J, Guedes AF, Fonseca M, Sanches J, Seruca R, Santos NC, Paredes J. Atomic force microscopy and graph analysis to study the P-cadherin/SFK mechanotransduction signalling in breast cancer cells. Nanoscale 2016; 8:19390-19401. [PMID: 27847941 DOI: 10.1039/c6nr04465d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Physical forces mediated by cell-cell adhesion molecules, as cadherins, play a crucial role in preserving normal tissue architecture. Accordingly, altered cadherins' expression has been documented as a common event during cancer progression. However, in most studies, no data exist linking pro-tumorigenic signaling and variations in the mechanical balance mediated by adhesive forces. In breast cancer, P-cadherin overexpression increases in vivo tumorigenic ability, as well as in vitro cell invasion, by activating Src family kinase (SFK) signalling. However, it is not known how P-cadherin and SFK activation impact cell-cell biomechanical properties. In the present work, using atomic force microscopy (AFM) images, cell stiffness and cell-cell adhesion measurements, and undirected graph analysis based on microscopic images, we have demonstrated that P-cadherin overexpression promotes significant alterations in cell's morphology, by decreasing cellular height and increasing its area. It also affects biomechanical properties, by decreasing cell-cell adhesion and cell stiffness. Furthermore, cellular network analysis showed alterations in intercellular organization, which is associated with cell-cell adhesion dysfunction, destabilization of an E-cadherin/p120ctn membrane complex and increased cell invasion. Remarkably, inhibition of SFK signaling, using dasatinib, reverted the pathogenic P-cadherin induced effects by increasing cell's height, cell-cell adhesion and cell stiffness, and generating more compact epithelial aggregates, as quantified by intercellular network analysis. In conclusion, P-cadherin/SFK signalling induces topological, morphological and biomechanical cell-cell alterations, which are associated with more invasive breast cancer cells. These effects could be further reverted by dasatinib treatment, demonstrating the applicability of AFM and cell network diagrams for measuring the epithelial biomechanical properties and structural organization.
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Affiliation(s)
- A S Ribeiro
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - F A Carvalho
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - J Figueiredo
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - R Carvalho
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | | | - J Monteiro
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
| | - A F Guedes
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | | | | | - R Seruca
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal and Medical Faculty of the University of Porto, Porto, Portugal
| | - N C Santos
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - J Paredes
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal. and Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal and Medical Faculty of the University of Porto, Porto, Portugal
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13
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Ribeiro AS, Avelar A, Dos Santos L, Silva AM, Gobbo LA, Schoenfeld BJ, Sardinha LB, Cyrino ES. Hypertrophy-type Resistance Training Improves Phase Angle in Young Adult Men and Women. Int J Sports Med 2016; 38:35-40. [PMID: 27793064 DOI: 10.1055/s-0042-102788] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The main purpose of the present study was to investigate the effect of a hypertrophy-type resistance training protocol on phase angle, an indicator of cellular integrity, in young adult men and women. 28 men (22.2±4.3 years, 67.8±9.0 kg and 174.2±6.8 cm) and 31 women (23.2±4.1 years, 58.7±12.1 kg and 162.7±6.4 cm) underwent a progressive RT for 16 weeks (2 phases, 8 weeks each), 3 times per week, consisting of 10 to 12 whole body exercises with 3 sets of 8-12 repetitions maximum. Phase angle, resistance, reactance and total body water (intra and extracellular water compartments) were assessed by bioimpedance spectroscopy (Xitron 4200 Bioimpedance Spectrum Analyzer). Total body water, intracellular water and phase angle increased significantly (P<0.05) in men (7.8, 8.3, and 4.3%, respectively) and women (7.6, 11.7, and 5.8% respectively), with no significant difference between sexes (P>0.05). Bioimpedance resistance decreased (P<0.05) similarly in both sex (men=-4.8%, women=-3.8%). The results suggest that regardless of sex, progressive RT induces an increase in phase angle and a rise in cellular hydration.
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Affiliation(s)
- A S Ribeiro
- Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, Brazil
| | - A Avelar
- Department of Physical Education, Center of Health Sciences, Maringá State University, Maringá, Brazil
| | - L Dos Santos
- Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, Brazil
| | - A M Silva
- Exercise and Health Laboratory, CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Cruz-Quebrada, Portugal
| | - L A Gobbo
- Department of Physical Education, São Paulo State University, Presidente Prudente, São Paulo, Brazil
| | - B J Schoenfeld
- Exercise Science Department, CUNY Lehman College, Bronx, New York, USAl
| | - L B Sardinha
- Exercise and Health Laboratory, CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Cruz-Quebrada, Portugal
| | - E S Cyrino
- Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, Brazil
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14
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Souza MF, Tomeleri CM, Ribeiro AS, Schoenfeld BJ, Silva AM, Sardinha LB, Cyrino ES. Effect of resistance training on phase angle in older women: A randomized controlled trial. Scand J Med Sci Sports 2016; 27:1308-1316. [PMID: 27541287 DOI: 10.1111/sms.12745] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/12/2016] [Indexed: 01/28/2023]
Affiliation(s)
- M. F. Souza
- Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center; Londrina State University; Londrina Parana Brazil
| | - C. M. Tomeleri
- Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center; Londrina State University; Londrina Parana Brazil
| | - A. S. Ribeiro
- Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center; Londrina State University; Londrina Parana Brazil
| | - B. J. Schoenfeld
- Exercise Science Department; CUNY Lehman College; Bronx New York USA
| | - A. M. Silva
- Exercise and Health Laboratory; CIPER; Faculty of Human Kinetics; Universidade de Lisboa; Lisbon Portugal
| | - L. B. Sardinha
- Exercise and Health Laboratory; CIPER; Faculty of Human Kinetics; Universidade de Lisboa; Lisbon Portugal
| | - E. S. Cyrino
- Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center; Londrina State University; Londrina Parana Brazil
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15
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Gouvea M, Cyrino ES, Ribeiro AS, da Silva DRP, Ohara D, Valente-Dos-Santos J, Coelho-E-Silva MJ, Ronque E. Influence of Skeletal Maturity on Size, Function and Sport-specific Technical Skills in Youth Soccer Players. Int J Sports Med 2016; 37:464-9. [PMID: 26990721 DOI: 10.1055/s-0035-1569370] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
This study compared variation in size, function and sport-specific technical skills of youth soccer players associated with differences in biological maturity status. 60 male soccer players of under-14 (U14) and under-17 (U17) categories were submitted to anthropometric and body composition measurements as well as motor and soccer-specific technical skill tests. Skeletal maturity was determined by skeletal age. Athletes of both categories were classified as early, on-time or late-maturing, according to the difference between chronological age and skeletal age. Body mass and height were lower in the late athletes, independent of category (P<0.01). Differences in adiposity were found only between athletes of the U14 (late<early, P<0.05). Statistically significant differences were identified on aerobic endurance in U14 (early<on time, P<0.01), upper limbs muscular strength (late<early, P<0.01) and flexibility in U17 (late<on time, P<0.05). Players in each age group of contrasting maturity status do not differ in soccer-specific skills. The results suggest that the maturational development influences body mass, height, body fat, flexibility, muscular strength of upper limbs and cardiorespiratory fitness, whereas the specific technical skills and other functional capabilities do not seem to be affected.
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Affiliation(s)
- M Gouvea
- Centro de Educação Física e Esporte, Londrina State University, Londrina, Brazil
| | - E S Cyrino
- Physical Education, Londrina State University, Londrina, Brazil
| | - A S Ribeiro
- Physical Education, Londrina State University, Londrina, Brazil
| | - D R P da Silva
- Physical Education, Londrina State University, Londrina, Brazil
| | - D Ohara
- Physical Education and Sport Center, State University Londrina, Londrina, Brazil
| | - J Valente-Dos-Santos
- Faculty of Sport Sciences and Physical Education, University of Coimbra, Coimbra, Portugal
| | - M J Coelho-E-Silva
- University of Coimbra, Estadio Universitario de Coimbra, Coimbra, Portugal
| | - E Ronque
- Study and Research Group in Physical Activity and Exercise (GEPAFE), State University Londrina, Londrina, Brazil
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16
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Lihavainen E, Kislin M, Toptunov D, Khiroug L, Ribeiro AS. Automatic quantification of mitochondrial fragmentation from two-photon microscope images of mouse brain tissue. J Microsc 2015; 260:338-51. [PMID: 26280657 DOI: 10.1111/jmi.12301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 04/13/2015] [Accepted: 07/09/2015] [Indexed: 01/07/2023]
Abstract
The morphology of mitochondria can inform about their functional state and, thus, about cell vitality. For example, fragmentation of the mitochondrial network is associated with many diseases. Recent advances in neuronal imaging have enabled the observation of mitochondria in live brains for long periods of time, enabling the study of their dynamics in animal models of diseases. To aid these studies, we developed an automatic method, based on supervised learning, for quantifying the degree of mitochondrial fragmentation in tissue images acquired via two-photon microscopy from transgenic mice, which exclusively express Enhanced cyan fluorescent protein (ECFP) under Thy1 promoter, targeted to the mitochondrial matrix in subpopulations of neurons. We tested the method on images prior to and after cardiac arrest, and found it to be sensitive to significant changes in mitochondrial morphology because of the arrest. We conclude that the method is useful in detecting morphological abnormalities in mitochondria and, likely, in other subcellular structures as well.
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Affiliation(s)
- E Lihavainen
- Laboratory of Biosystem Dynamics, Department of Signal Processing, Tampere University of Technology, Tampere, Finland
| | - M Kislin
- Neuroscience Center, University of Helsinki, Helsinki, Finland
| | | | - L Khiroug
- Neuroscience Center, University of Helsinki, Helsinki, Finland
| | - A S Ribeiro
- Laboratory of Biosystem Dynamics, Department of Signal Processing, Tampere University of Technology, Tampere, Finland
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17
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Almeida AKA, Monteiro MP, Dias JMM, Omena L, da Silva AJC, Tonholo J, Mortimer RJ, Navarro M, Jacinto C, Ribeiro AS, de Oliveira IN. Synthesis and spectroscopic characterization of a fluorescent pyrrole derivative containing electron acceptor and donor groups. Spectrochim Acta A Mol Biomol Spectrosc 2014; 128:812-818. [PMID: 24704598 DOI: 10.1016/j.saa.2014.03.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [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: 08/26/2013] [Revised: 02/24/2014] [Accepted: 03/08/2014] [Indexed: 06/03/2023]
Abstract
The synthesis and fluorescence characterization of a new pyrrole derivative (PyPDG) containing the electron donor-acceptor dansyl substituent is reported. The effects of temperature and solvent polarity on the steady-state fluorescence of this compound are investigated. Our results show that PyPDG exhibits desirable fluorescent properties which makes it a promising candidate to be used as the photoactive material in optical thermometry and thermography applications. Further, the electrochemical and emission properties of polymeric films obtained from the oxidation polymerization of PyPDG are also analyzed.
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Affiliation(s)
- A K A Almeida
- Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceió-AL, Brazil
| | - M P Monteiro
- Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió-AL, Brazil
| | - J M M Dias
- Departamento de Química Fundamental, CCEN, Universidade Federal de Pernambuco, 50670-901 Recife-PE, Brazil
| | - L Omena
- Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió-AL, Brazil
| | - A J C da Silva
- Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceió-AL, Brazil
| | - J Tonholo
- Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceió-AL, Brazil
| | - R J Mortimer
- Department of Chemistry, Loughborough University, LE11 3TU Leicestershire, United Kingdom
| | - M Navarro
- Departamento de Química Fundamental, CCEN, Universidade Federal de Pernambuco, 50670-901 Recife-PE, Brazil
| | - C Jacinto
- Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió-AL, Brazil
| | - A S Ribeiro
- Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceió-AL, Brazil; Department of Chemistry, Loughborough University, LE11 3TU Leicestershire, United Kingdom
| | - I N de Oliveira
- Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió-AL, Brazil.
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18
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Hakkinen A, Kandhavelu M, Garasto S, Ribeiro AS. Estimation of fluorescence-tagged RNA numbers from spot intensities. Bioinformatics 2014; 30:1146-1153. [DOI: 10.1093/bioinformatics/btt766] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Accepted: 12/25/2013] [Indexed: 11/14/2022] Open
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Kandhavelu M, Paturu L, Mizar A, Mahmudov KT, Kopylovich MN, Karp M, Yli-Harja O, Pombeiro AJL, Ribeiro AS. Synthesis, characterization and antimicrobial activity of arylhydrazones of methylene active compounds. Pharm Chem J 2012. [DOI: 10.1007/s11094-012-0751-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Silva MF, Ribeiro AS, Fiorot FJ, Aikawa NE, Lotito AP, Campos LM, Mauad T, Silva CA. Invasive aspergillosis: a severe infection in juvenile systemic lupus erythematosus patients. Lupus 2012; 21:1011-6. [PMID: 22451602 DOI: 10.1177/0961203312442752] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [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
Infections are an important cause of morbidity and mortality in juvenile systemic lupus erythematosus (JSLE). Among them, invasive aspergillosis (IA), which is usually related to immunosuppressed patients, has been rarely reported in JSLE. From 1983 to 2011, 5604 patients were followed at our institution and 283 (5%) met the American College of Rheumatology (ACR) classification criteria for SLE. Six (2.1%) of our JSLE patients had IA. One of them was previously reported and five will be described herein. Four of them were female. The median age at JSLE diagnosis was 12 years (8–16) and the median interval between diagnosis of JSLE and IA was 6 months (1–38). All had pulmonary involvement and three of them had systemic involvement. The median Systemic Lupus Erythematosus Disease Activity Index 2000 (SLEDAI-2K) was 19 (7–22). Diagnosis of IA was performed by isolation of Aspergillus spp., two in bronchoalveolar lavage culture and by way of autopsy in the others. All of them were treated with corticosteroids and/or immunosuppressive drugs at IA diagnosis (azathioprine and/or intravenous cyclophosphamide). They all required treatment in the pediatric intensive care unit with mechanical ventilation and antifungal therapy (fluconazole, amphotericin B, itraconazole and/or voriconazole); nonetheless, none of them survived. In conclusion, this was the first report that evaluated the prevalence of IA in a large population of JSLE patients from a tertiary pediatric hospital, and clearly showed the severity of the outcome, especially in patients with active disease and treated with immunosuppressive agents. This study reinforces the importance of early diagnosis and treatment with certain antifungals, especially in critically ill patients.
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Affiliation(s)
- MF Silva
- Pediatric Rheumatology Unit, Faculdade de Medicina da Universidade São Paulo, Brazil
| | - AS Ribeiro
- Pediatric Rheumatology Unit, Faculdade de Medicina da Universidade São Paulo, Brazil
| | - FJ Fiorot
- Pediatric Rheumatology Unit, Faculdade de Medicina da Universidade São Paulo, Brazil
| | - NE Aikawa
- Pediatric Rheumatology Unit, Faculdade de Medicina da Universidade São Paulo, Brazil
- Division of Rheumatology, Faculdade de Medicina da Universidade São Paulo, Brazil
| | - AP Lotito
- Pediatric Rheumatology Unit, Faculdade de Medicina da Universidade São Paulo, Brazil
| | - LM Campos
- Pediatric Rheumatology Unit, Faculdade de Medicina da Universidade São Paulo, Brazil
| | - T Mauad
- Department of Pathology, Faculdade de Medicina da Universidade São Paulo, Brazil
| | - CA Silva
- Pediatric Rheumatology Unit, Faculdade de Medicina da Universidade São Paulo, Brazil
- Division of Rheumatology, Faculdade de Medicina da Universidade São Paulo, Brazil
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Chowdhury S, Kandhavelu M, Yli-Harja O, Ribeiro AS. An interacting multiple model filter-based autofocus strategy for confocal time-lapse microscopy. J Microsc 2011; 245:265-75. [PMID: 22091730 DOI: 10.1111/j.1365-2818.2011.03568.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Gene expression and other cellular processes are stochastic, thus their study requires observing multiple events in multiple cells. Therefore, confocal microscopy cell imaging has recently gained much interest. In time-lapse imaging, adjustments are needed at short intervals to compensate for focus drift. There are several automated methods for this purpose. In general, before acquiring higher resolution images, software-based autofocus algorithms require a set of low-resolution images along the z-axis to determine the plane for which a predefined focusing function is maximized. These algorithms require 10-100 z-slices each time, and there is no fixed number or upper limit of required z-slices that ensures optimal focusing. The higher is this number, the stronger is photo bleaching, hampering the feasibility of long-time series measurements. We propose a new focusing strategy in time-lapse imaging. The algorithm relies on the nature and predictability of the focus drift. We first show that the focus drift curve is predictable within a small error bound in standard experimental setups. We, then, exploit the interacting multiple model filter algorithm to predict the drift at time, t, based on the measurement at time t-1. This allows a drastic reduction of the number of required z-slices for focus drift correction, largely overcoming the problem of photo bleaching. In addition, we propose a new set of functions for focusing in time-lapse imaging, derived from preexisting ones. We demonstrate the method's efficiency in time-lapse imaging of Escherichia coli cells expressing MS2d-GFP tagged RNA molecules.
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Affiliation(s)
- S Chowdhury
- Computational Systems Biology Research Group, Department of Signal Processing, Tampere University of Technology, Finland
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23
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Ribeiro AS, Dahl KN. The nucleus as a central structure in defining the mechanical properties of stem cells. Annu Int Conf IEEE Eng Med Biol Soc 2011; 2010:831-4. [PMID: 21096312 DOI: 10.1109/iembs.2010.5626785] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Manipulation of stem cells is one of the highest goals within biological sciences for the development of devices for the regeneration of injured tissues. In general, the mechanical properties of cells are nowadays recognized to play a role in many cellular phenotypes, including mobility though tissues, survival to mechanical loading and differentiation. Here we present a study where the mechanics of bone marrow CD34+ hematopoietic stem cells (CD34+ cells) and bone marrow stromal cells (BMSCs) is investigated through micropipette aspiration. The objective was to address the role of the nucleus as a central mechanoactive structure in stem cells. Stem cell nuclei occupy most of the cell volume and present different properties from what is known for somatic cells. Mechanics revealed to be highly dependent on the nucleus, where CD34+ cells revealed to be stiffer than BMSCs for short times under loading assuming elastic behavior and highly viscoelastic for longer times under loading, which present a higher nuclear volume per cell volume ratio. Mechanics was also evaluated for agglomerates of stem cells by aspirating spheres of neural progenitor cells (NSC-Ss). Relatively to single cells, NSC-Ss presented higher deformability, which seems to be more dependent on intracellular connectivity than on cell mechanics. The general character of the reported conclusions is being investigated with other types of stem cells.
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Affiliation(s)
- A S Ribeiro
- Department of Biomedical Engineering at Carnegie Mellon University in Pittsburgh PA, USA.
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24
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Alves LFDA, Fernandes BF, Menezes MS, Ribeiro AS, Leal MM, Burnier JV, Burnier MN. Management of glaucoma in an eye with diffuse iris melanocytoma. Br J Ophthalmol 2010; 95:1471, 1479. [DOI: 10.1136/bjo.2009.175638] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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25
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Albergaria A, Ribeiro AS, Pinho S, Milanezi F, Carneiro V, Sousa B, Sousa S, Oliveira C, Machado JC, Seruca R, Paredes J, Schmitt F. ICI 182,780 induces P-cadherin overexpression in breast cancer cells through chromatin remodelling at the promoter level: a role for C/EBP in CDH3 gene activation. Hum Mol Genet 2010; 19:2554-66. [DOI: 10.1093/hmg/ddq134] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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26
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Paredes J, Correia AL, Ribeiro AS, Milanezi F, Cameselle-Teijeiro J, Schmitt FC. Breast carcinomas that co-express E- and P-cadherin are associated with p120-catenin cytoplasmic localisation and poor patient survival. J Clin Pathol 2008; 61:856-62. [PMID: 18381381 DOI: 10.1136/jcp.2007.052704] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Changes in junctional catenin expression may compromise cadherin-mediated adhesion, increasing cell malignant properties such as invasive and metastatic abilities. Altered expression of alpha-, beta-, gamma- and p120-catenin has been reported to be associated with E-cadherin loss or decreased expression, in both breast carcinomas and breast cancer cell lines. AIMS AND METHODS To investigate the expression and subcellular localisation of p120- and beta-catenin in a series of human invasive breast carcinomas, and correlate it with biological markers and clinicopathological parameters. RESULTS Both catenins frequently exhibited a reduced membranous or cytoplasmic staining pattern. These alterations were significantly correlated with lack of both E-cadherin and oestrogen receptor-alpha expression. It was possible to associate the expression of beta-catenin with histological grade, tumour size and nodal status, suggesting a relevant role for this catenin as a prognostic factor. The majority of E- and P-cadherin co-expressing tumours were related to cytoplasmic expression of p120-catenin; in this group of breast carcinomas, patient survival was poor. CONCLUSION Results indicate that p120-catenin cytoplasmic accumulation may play an important role in mediating the oncogenic effects derived from P-cadherin aberrant expression, including enhanced motility and invasion, particularly in tumours which maintain E-cadherin expression.
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Affiliation(s)
- J Paredes
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal.
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27
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Preto A, Figueiredo J, Velho S, Ribeiro AS, Soares P, Oliveira C, Seruca R. BRAF provides proliferation and survival signals in MSI colorectal carcinoma cells displaying BRAF(V600E) but not KRAS mutations. J Pathol 2008; 214:320-7. [PMID: 18098337 DOI: 10.1002/path.2295] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BRAF kinase is a downstream target of KRAS and activates the MAPK pathway. These two molecules are prone to mutations in sporadic microsatellite unstable (MSI) colorectal carcinomas (CRC) and BRAF V600E mutations are inversely associated with oncogenic KRAS mutations. The biological significance of BRAF V600E oncogenic activation is not well established in this type of tumour. We aimed to study proliferation and survival effects induced by BRAF inhibition in MSI CRC cell lines harbouring distinct genetic backgrounds (BRAF V600E or KRAS G13D). Suppression of BRAF in BRAF V600E MSI CRC cell lines by RNA interference significantly inhibited proliferation and induced apoptosis, as demonstrated by BrdU incorporation and TUNEL assay, respectively. No significant differences were seen in proliferation and apoptosis, in cell lines harbouring KRAS G13D, after BRAF inhibition. We further analysed proliferation-associated molecules (pERK1/2, cyclin D1, p27 Kip1) and apoptosis-associated molecules (Bcl-2, Bax, pAkt, pBad, XIAP) in all cell lines. After BRAF down-regulation, we found a more pronounced decrease in ERK1/2 phosphorylation and cyclin D1 expression levels in BRAF-mutated cell lines in comparison to KRAS mutated cells. Upon BRAF inhibition, we also found an increase in p27(Kip1) levels and a more pronounced decrease in the levels of anti-apoptotic protein Bcl-2, specifically in cell lines with BRAF V600E. In conclusion, we have shown that MSI KRAS and BRAF mutant CRC cell lines respond differently to BRAF knockdown. This report provides evidence supporting BRAF as a good target for therapeutic intervention in patients with sporadic MSI CRC harbouring activating mutations in BRAF but not in KRAS.
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Affiliation(s)
- A Preto
- Institute of Molecular Pathology and Immunology, University of Porto, 4200-465 Porto, Portugal
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Ribeiro AS, Salerno VP, Sorenson M. Probing actomyosin interactions with 2,4-dinitrophenol. Biochim Biophys Acta 2005; 1748:165-73. [PMID: 15769593 DOI: 10.1016/j.bbapap.2004.12.016] [Citation(s) in RCA: 4] [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: 09/10/2004] [Revised: 12/27/2004] [Accepted: 12/27/2004] [Indexed: 11/26/2022]
Abstract
Access to different intermediates that follow ATP cleavage in the catalytic cycle of skeletal muscle actomyosin is a major goal of studies that aim toward an understanding of chemomechanical coupling in muscle contraction. 2,4-Dinitrophenol (DNP, 10(-2) M) inhibits muscle contraction, even though it accelerates the ATPase activity of isolated myosin. Here we used myosin subfragment 1 (S1), acto-S1 and mammalian skinned fibers to investigate the action of DNP in the presence of actin. DNP increases acto-S1 affinity and at the same time reduces the maximum rate of turnover as [actin]-->infinity. In skinned fibers, isometric force is reduced to the same extent (K0.5 approximately equal to 6 mM). Although actin activates Pi release from S1 at all DNP concentrations tested, the combination of enhanced S1 activity and reduced acto-S1 activity leads to a reduction in the ratio of these two rates by a factor of 30 at the highest DNP concentration tested. This effect is seen at low as well as at high actin concentrations and is less pronounced with the analog meta-nitrophenol (MNP), which does not inhibit the acto-S1 ATPase. Arrhenius plots for acto-S1 are parallel and linear between 5 and 30 degrees C, indicating no abrupt shifts in rate-limiting step with either DNP or MNP. Analysis of the reduction in isometric force with increasing Pi concentrations suggests that DNP and MNP stabilize weakly bound cross-bridges (AM.ADP.Pi). In addition, MNP (10(-2) M) increases the apparent affinity for Pi.
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Affiliation(s)
- A S Ribeiro
- Instituto de Bioquímica Médica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-590 RJ, Brazil
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Gomes ME, Ribeiro AS, Malafaya PB, Reis RL, Cunha AM. A new approach based on injection moulding to produce biodegradable starch-based polymeric scaffolds: morphology, mechanical and degradation behaviour. Biomaterials 2001; 22:883-9. [PMID: 11311006 DOI: 10.1016/s0142-9612(00)00211-8] [Citation(s) in RCA: 303] [Impact Index Per Article: 13.2] [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: 10/18/2022]
Abstract
One of the present challenges in polymer scaffold processing is the fabrication of three-dimensional (3D) architectures with an adequate mechanical performance to be used in the tissue engineering of hard tissues. This paper describes a preliminary study on the development of a new method to produce biodegradable scaffolds from a range of corn-starch-based polymers. In some cases, hydroxlapatite was also used as a reinforcement of the biodegradable polymers. The developed methodology consists of a standard conventional injection moulding process, on which a solid blowing agent based on carboxylic acids is used to generate the foaming of the bulk of the moulded part. The proposed route allows for the production of scaffolds with a compact skin and a porous core, with promising mechanical properties. By using the developed method it is possible to manufacture biodegradable polymer scaffolds in an easy (melt-based processing) and reproducible manner. The scaffolds can be moulded into complex shapes, and the blowing additives do not affect the non-cytotoxic behaviour of the starch-based materials. The materials produced using this method were evaluated with respect to the morphology of the porous structure, and the respective mechanical properties and degradation behaviour. It was demonstrated that it is possible to obtain, by a standard melt based processing route, 3D scaffolds with complex shapes that exhibit an appropriate morphology, without decreasing significantly the mechanical properties of the materials. It is believed that the optimisation of the proposed processing methodology may lead to the production of scaffolds that might be used on the regeneration of load-bearing tissues.
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Affiliation(s)
- M E Gomes
- Department of Polymer Engineering, University of Minho, Braga, Portugal.
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Veiga SS, Feitosa L, dos Santos VL, de Souza GA, Ribeiro AS, Mangili OC, Porcionatto MA, Nader HB, Dietrich CP, Brentani RR, Gremski W. Effect of brown spider venom on basement membrane structures. Histochem J 2000; 32:397-408. [PMID: 10987503 DOI: 10.1023/a:1004031019827] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Loxoscelism or necrotic arachnidism are terms used to describe lesions and reactions induced by bites (envenomation) from spiders of the genus Loxosceles. Envenomation has been reported to provoke dermonecrosis and haemorrhage at the bite site and haemolysis, disseminated intravascular coagulation and renal failure. The purpose of this work was to study the effect of the venom of the brown spider Loxosceles intermedia on basement membrane structures and on its major constituent molecules. Light microscopy observations showed that L. intermedia venom obtained through electric shock, which reproduces two major signals of Loxoscelism in the laboratory, exhibits activity toward basement membrane structures in mouse Engelbreth-Holm-Swarm (EHS) sarcoma. Basement degradation was seen by a reduced periodic acid-Schiff (PAS) and alcian blue staining as well as by a reduced immunostaining for laminin when compared to control experiments. Electron microscopy studies confirmed the above results, showing the action of the venom on EHS-basement membranes and demonstrating that these tissue structures are susceptible to the venom. Using purified components of the basement membrane, we determined through SDS-PAGE and agarose gel that the venom is not active toward laminin or type IV collagen, but is capable of cleaving entactin and endothelial heparan sulphate proteoglycan. In addition, when EHS tissue was incubated with venom we detected a release of laminin into the supernatant, corroborating the occurrence of some basement membrane disruption. The venom-degrading effect on entactin was blocked by 1, 10-phenanthroline, but not by other protease inhibitors such as PMSF, NEM or pepstatin-A. By using light microscopy associated with PAS staining we were able to identify that 1,10-phenanthroline also inhibits EHS-basement membrane disruption evoked by venom, corroborating that a metalloprotease of venom is involved in these effects. Degradation of these extracellular matrix molecules and the observed susceptibility of the basement membrane could lead to loss of vessel and glomerular integrity, resulting in haemorrhage and renal problems after envenomation.
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Affiliation(s)
- S S Veiga
- Department of Cell Biology, Federal University of Parana, Jardim das Americas, Brazil
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Salerno VP, Ribeiro AS, Dinucci AN, Mignaco JA, Sorenson MM. Specificity and kinetic effects of nitrophenol analogues that activate myosin subfragment 1. Biochem J 1997; 324 ( Pt 3):877-84. [PMID: 9210412 PMCID: PMC1218504 DOI: 10.1042/bj3240877] [Citation(s) in RCA: 11] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
2,4-Dinitrophenol (DNP) activates the myosin ATPase of mammalian skeletal muscle in the presence of Ca2+ or Mg2+, and inhibits it when the bivalent cations are replaced by K+ and EDTA. Activation of Mg2+ATPase is abolished by the presence of unregulated actin. 3-Nitrophenol (3-NP) is also an activator, whereas other analogues (2-nitrophenol, 2-NP, and 4-nitrophenol, 4-NP) are much less effective. Concentrations required for their half-maximal effects (K0.5) range from 2 to 15 mM for 3-NP and DNP in the presence of different cations, and the sequence for the analogues is 3-NP<=DNP<<2-NP approximately 4-NP, which is apparently unrelated to either hydrophobicity or pK. DNP and 3-NP have almost identical effects on the ATPase activity of chymotryptic subfragment 1 as they do on myosin, which is an indication that their target is the globular head region rather than the tail, or the 18 kDa (regulatory) light chain. Analysis of the ATP concentration dependence for subfragment- 1 ATPase in the presence of Ca2+ or Mg2+ shows that DNP activates only at high substrate concentrations, becoming increasingly effective with ATP concentrations in the physiological range. At low substrate concentrations, DNP inhibits hydrolysis by increasing the apparent Km for ATP at the catalytic site. In the presence of Mg2+, it mimics the effect of actin, which increases the Km and accelerates the release of products following hydrolysis. At high substrate concentrations, activation by DNP appears to involve a kinetic component with low affinity for ATP that can increase the overall reaction rate by a factor of 2- to 9-fold, depending on the bivalent cation. This low-affinity component is either induced by the drug (in the presence of Mg2+) or shifted by the drug to a lower ATP concentration range (in the presence of Ca2+).
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Affiliation(s)
- V P Salerno
- Departamento de Bioquímica Médica, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, 21941-590 Rio de Janeiro, RJ, Brazil
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Arala-Chaves MP, Ribeiro AS, Santarém MM, Coutinho A. Strong mitogenic effect for murine B lymphocytes of an immunosuppressor substance released by Streptococcus intermedius. Infect Immun 1986; 54:543-8. [PMID: 3490441 PMCID: PMC260195 DOI: 10.1128/iai.54.2.543-548.1986] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
A noncytotoxic protein substance, produced by Streptococcus intermedius, with very potent immunosuppressive properties (F3'EP-Si) was tested for lymphocyte mitogenic activity. Although devoid of T-cell mitogenicity, F3'EP-Si stimulated proliferation and led to high numbers of plaque-forming cells in cultures of normal or T-cell-depleted, small or large splenic B cells from both lipopolysaccharide-responding and -nonresponding mice. The B-cell mitogenic activity of F3'EP-Si was quantitatively comparable to that of lipopolysaccharide, and the simultaneous exposure to both mitogens stimulated additive B-cell responses. Injection of F3'EP-Si into normal mice resulted in increased numbers of spleen cells, higher rates of mitotic activity, and very large numbers of plaque-forming cells, predominantly of the immunoglobulin G2a and -b isotypes. In preliminary experiments, the analysis of surface markers among the lymphocytes participating in the blastogenic response in vivo revealed a T-cell component in the response to F3'EP-Si. These observations are discussed in the context of the immunosuppressive activity of this and other microbial substances.
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