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Leal B, Carvalho C, Chaves J, Bettencourt A, Ferreira R, Rangel R, Santos A, Boleixa D, Freitas J, Lopes J, Ramalheira J, Martins da Silva B, Costa P, Martins da Silva A, Correia-de-Sá P. Inverse correlation between miR-22 serum levels and p2x7r-mediated inflammatory response in mesial temporal lobe epilepsy patients. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Guerreiro R, Ruano C, Soares C, Santos F, Portugal G, Gomes L, Bento A, Costa M, Fernandes R, Cacao R, Ramos R, Ferreira R, Goncalves L, Aguiar J. P871Validation of pre-test probability model of coronary artery disease in the Portuguese population. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ferreira R, Buttell F. THE BP OIL SPILL: RESILIENCE IN THE AFTERMATH OF POST-DISASTER OLDER ADULT INTIMATE PARTNER VIOLENCE. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Liddell J, Ferreira R. PREDICTORS OF INDIVIDUAL RESILIENCY AMONG INDIVIDUALS AGE 65 AND OLDER IN POST-DISASTER SETTINGS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Conceição MAP, Cravo I, Costa IMH, Ferreira R, Costa RPR, Castro A, Costa JMC. Echinococcus granulosus ss in dog - A report in center-northern Portugal. VETERINARY PARASITOLOGY- REGIONAL STUDIES AND REPORTS 2017; 9:84-87. [PMID: 31014848 DOI: 10.1016/j.vprsr.2017.05.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 04/21/2017] [Accepted: 05/11/2017] [Indexed: 11/16/2022]
Abstract
Routine parasitic control and health care of the dog is lacking in many Portuguese rural communities. Freely roaming and stray dogs are responsible for the maintenance of a permanent parasitic infection pressure, namely of zoonotic importance. Therefore, a good understanding of the epidemiology of Echinococcus granulosus including the transmission to man is of great significance to further the awareness within the rural populations and the local health authorities of this zoonotic parasite. This report aims at a better understanding of the epidemiology of Echinococcus granulosus in the Cantanhede region, located in the Central region of Portugal, through the necropsy of stray dogs. At the Official Veterinary Kennel of this Municipality, 105 stray dogs were studied for the presence of Echinococcus granulosus following the adult cestode recovery with necropsy procedure of the first third part of the small intestine. One dog revealed to be positive (1.05%) and the sampled Echinococcus were genotyped and identified as E. granulosus ss. As this genotype is widely spread and has been reported in different parts of the world, further work is necessary to be conducted in this and other regions of Portugal for a better understanding of E. granulosus epidemiology within the typical small rural farms where pig rearing plays an important economic role.
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Böhnert T, Serrano-Guisan S, Paz E, Lacoste B, Ferreira R, Freitas PP. Magnetic tunnel junctions with integrated thermometers for magnetothermopower measurements. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:185303. [PMID: 28247852 DOI: 10.1088/1361-648x/aa63ab] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Magnetic tunnel junction (MTJ) micropillars were fabricated with integrated thermometers and a heater line (HL) for thermovoltage measurements. This novel thermometer configuration enabled a direct measurement of ΔT across the MTJ micropillar. The MTJ devices were patterned from a CoFeB/MgO/CoFeB stack, with a 1.2 nm to 1.6 nm MgO wedge across the wafer, resulting in resistance area products in the range of 0.7 kΩ · µm2 < R × A < 55 kΩ · µm2. This allowed the measurement of thermoelectric properties as a function of the tunnel barrier thickness. The thermometers showed a homogeneous heating behavior for all devices across the wafer. Combining the in-stack temperature measurements and finite element simulations the thermal profile across the MTJ structure and the thermopower were estimated with a noticeable improvement of the measurement accuracy. The studied MTJ structures showed tunneling magnetoresistance (TMR) ratios up to 125%, and tunneling magnetothermopower (TMTP) up to 35%.
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da Costa DR, Chaves A, Ferreira WP, Farias GA, Ferreira R. Electronic properties of superlattices on quantum rings. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:165501. [PMID: 28218615 DOI: 10.1088/1361-648x/aa617e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a theoretical study of the one-electron states of a semiconductor-made quantum ring (QR) containing a series of piecewise-constant wells and barriers distributed along the ring circumference. The single quantum well and the superlattice cases are considered in detail. We also investigate how such confining potentials affect the Aharonov-Bohm like oscillations of the energy spectrum and current in the presence of a magnetic field. The model is simple enough so as to allow obtaining various analytical or quasi-analytical results. We show that the well-in-a-ring structure presents enhanced localization features, as well as specific geometrical resonances in its above-barrier spectrum. We stress that the superlattice-in-a-ring structure allows giving a physical meaning to the often used but usually artificial Born-von-Karman periodic conditions, and discuss in detail the formation of energy minibands and minigaps for the circumferential motion, as well as several properties of the superlattice eigenstates in the presence of the magnetic field. We obtain that the Aharonov-Bohm oscillations of below-barrier miniband states are reinforced, owing to the important tunnel coupling between neighbour wells of the superlattice, which permits the electron to move in the ring. Additionally, we analysis a superlattice-like structure made of a regular distribution of ionized impurities placed around the QR, a system that may implement the superlattice in a ring idea. Finally, we consider several random disorder models, in order to study roughness disorder and to tackle the robustness of some results against deviations from the ideally nanostructured ring system.
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Padrão AI, Figueira ACC, Faustino-Rocha AI, Gama A, Loureiro MM, Neuparth MJ, Moreira-Gonçalves D, Vitorino R, Amado F, Santos LL, Oliveira PA, Duarte JA, Ferreira R. Long-term exercise training prevents mammary tumorigenesis-induced muscle wasting in rats through the regulation of TWEAK signalling. Acta Physiol (Oxf) 2017; 219:803-813. [PMID: 27228549 DOI: 10.1111/apha.12721] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 01/27/2016] [Accepted: 05/24/2016] [Indexed: 12/27/2022]
Abstract
AIM Exercise training has been suggested as a non-pharmacological approach to prevent skeletal muscle wasting and improve muscle function in cancer cachexia. However, little is known about the molecular mechanisms underlying such beneficial effect. In this study, we aimed to, firstly, examine the contribution of TWEAK signalling to cancer-induced skeletal muscle wasting and, secondly, evaluate whether long-term exercise alters TWEAK signalling and prevents muscle wasting. METHODS Female Sprague-Dawley rats were randomly assigned to control and exercise groups. Fifteen animals from each group were exposed to N-Methyl-N-nitrosourea carcinogen. Animals in exercise groups were submitted to moderate treadmill exercise for 35 weeks. After the experimental period, animals were killed and gastrocnemius muscles were harvested for morphological and biochemical analysis. RESULTS We verified that exercise training prevented tumour-induced TWEAK/NF-κB signalling in skeletal muscle with a beneficial impact in fibre cross-sectional area and metabolism. Indeed, 35 weeks of exercise training promoted the upregulation of PGC-1α and oxidative phosphorylation complexes. This exercise-induced muscle remodelling in tumour-bearing animals was associated with less malignant mammary lesions. CONCLUSION Data support the benefits of an active lifestyle for the prevention of muscle wasting secondary to breast cancer, highlighting TWEAK/NF- κB signalling as a potential therapeutic target for the preservation of muscle mass.
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Ferreira R, Ruano M, Ruano A. Intelligent non-invasive modeling of ultrasound-induced temperature in tissue phantoms. Biomed Signal Process Control 2017. [DOI: 10.1016/j.bspc.2016.11.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Faustino-Rocha A, Gama A, Oliveira P, Ferreira R, Ginja M. Mast Cells as Targets in Mammary Carcinogenesis. J Comp Pathol 2017. [DOI: 10.1016/j.jcpa.2016.11.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Faustino-Rocha A, Silva A, Gabriel J, Gil da Costa R, Oliveira P, Gama A, Ferreira R, Ginja M. Long-Term Exercise Training and Mammary Tumour Vascularization: Thermography, Ultrasonography and Immunohistochemistry. J Comp Pathol 2017. [DOI: 10.1016/j.jcpa.2016.11.199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Rovani MT, Gasperin BG, Ferreira R, Duggavathi R, Bordignon V, Gonçalves PBD. Methods to study ovarian function in monovulatory species using the cow as a model. Anim Reprod 2017. [DOI: 10.21451/1984-3143-ar832] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Bidviene J, Zhukovskiy N, Peritore A, Rodrigues I, Tundidor Sanz ME, Guerreiro RA, Marini C, Cereda A, Dorobantu DM, Cavalli G, Cavaliere A, Genovese D, Romeo G, Aruta P, Cucchini U, Iliceto S, Badano LP, Muraru D, Okhotin A, Privorotskaya V, De Chiara B, Musca F, Spano' F, Santambrogio G, Casadei F, Forti E, Mutignani M, Giannattasio C, Moreo A, Galrinho A, Branco L, Bravio I, Machado D, Monteiro A, Daniel P, Ferreira L, Carvalho R, Ferreira R, Tierra Rodriguez AM, Dios Diez P, Mayorga Bajo A, Fernandez Gomez MJ, Dominguez Calvo JI, Rogriguez Palomo D, Hernandez Rodriguez J, Congo K, Carvalho J, Pais J, Bras D, Picarra B, Caeiro A, Fragata J, Aguiar J, Stella S, Rosa I, Pavon AG, Ancona F, Margonato A, Colombo A, Latib A, Montorfano M, Agricola E, Casadei F, Moreo A, Ghiorghiu IA, Popescu BA, Coman IM, Ginghina CD, Enache R. Clinical Cases: See that case at least once1174An unrecognized mechanism of functional tricuspid regurgitation revealed by transthoracic three-dimensional echocardiography1175Left ventricular pseudoaneurysm after radiofrequency ablation of premature ventricular contractions1176Succesfull management of buckling of echocardiographic transesophageal probe1177An extremely rare tumor of cardiovascular system1178Pneumopericardium: a rare complication of esophageal cancer1179Left atrial dissection after myocardial infarction1180Late appearance of a ventricular septal defect after transcatheter aortic valve replacement: a rare complication1181Doppler flow velocities pattern in a trombophiliac patient with an lvad thrombosis1182An unusual cause of aortic diastolic reflux in a failed single ventricle palliation. Eur Heart J Cardiovasc Imaging 2016. [DOI: 10.1093/ehjci/jew263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tojino AL, Laymouna R, Monteiro A, Velcea A, Almeida Morais L, Enzan N, Wang TL, Kemaloglu Oz TUĞBA, Mursa A, Pfeiffer B, Tomaszewski M, Cuddy S, Giubertoni A, Rojo Prieto N, Ruivo C, Saito M, Dorobantu DM, Kemal HS, Sta Maria HF, Tiongco RP, Elsharkawy E, Morsy Y, Elshafei M, Elgowelly M, Almaghraby A, Branco L, Agapito A, Sousa L, Galrinho A, Pinto F, Rio P, Rosa S, Portugal G, Ferreira R, Mihaila S, Patrascu N, Adronic A, Cinteza M, Vinereanu D, Fiarresga A, Cacela D, Sousa L, Galrinho A, Branco L, Rodrigues R, Banazol N, Ferreira L, Ferreira R, Tsutsumi T, Matsumoto T, Uchida T, Yamada A, Hsiung MC, Eren MEHMET, Zarma L, Popescu BA, Ginghina C, Jurcut R, Neugebauer A, Rigopoulos A, Seggewiss H, Czekajska-Chehab E, Pietura R, Tomaszewski A, Sullivan V, Cosgrave J, Daly C, Murphy R, Zanaboni J, Gravellone M, Piccinino C, Marino PN, Lezcano Pertejo C, Hernandez Diez C, Alvarez Roy L, Martinez Paz E, Ascencio Lemus MG, Lopez Benito M, Fernandez-Vazquez F, Martin Gutierrez E, Castano Ruiz M, Guardado J, Santos L, Montenegro Sa F, Saraiva F, Correia J, Morais J, Mahara K, Ueda T, Ishii T, Hamamichi Y, Katsuragi S, Enache R, Platon P, Vladaia A, Popescu BA, Ginghina CD, Gunsel A, Cerit L, Duygu HS. Clinical Case Poster session 2P608Infective endocarditis in an adult female with bicuspid aortic valve, hypertrophic cardiomyopathy and amyopathic dermatomyositisP609Left ventricular massP610A rare case of mitral stenosis - Shones syndromeP611The added value of three-dimensional echocardiography in the late diagnosis of a pacemaker complication in a patient with severe congestive heart failureP612Percutaneous paravalvular leak closure - procedure pitfallsP613A case of late left ventricular pseudoaneurysm after aortic valve replacement for infective endocarditis.P614Pseudoaneurysm of right ventricle and acute heart failure caused by prosthetic aortic valve endocarditisP615A misclassification of pulmonary stenosis severity during pregnancyP616A problematic case of left ventricular hypertrophyP617High variability of dynamic obstruction in a patient with hypertrophic obstructive cardiomyopathy and tako-tsubo-cardiomyopathyP618Arterio-venous pulmonary fistula in patient after cerebral strokeP619Rapid myocardial calcification in acute sepsisP620Acute right heart failure after delivery in patient with new-diagnosed pulmonary arterial hypertensionP621When the right ventricle plays hide-and-seekP622Adult congenital heart disease: when what grows wrong goes wrongP623Prenatal diagnosis of mixed type total anomalous pulmonary venous connection in aspleniaP624Uncorrected single ventricle in an adult patient: do coexisting valvular abnormalities matter?P625Ventricular septal aneurysm associated with bicuspid aorta: a case report. Eur Heart J Cardiovasc Imaging 2016. [DOI: 10.1093/ehjci/jew249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Baruselli P, Batista E, Ferreira R. Niveles plasmáticos de hormona anti-mülleriana permite la selección de donadoras con alto potencial de producción de embriones. SPERMOVA 2016. [DOI: 10.18548/aspe/0003.01] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Sequeira Duarte J, Tavares Bello C, Fonseca R, Ferreira R, Oliveira M, Saraiva C, Gouveia C, Santos F, Azinheira J, Vasconcelos C. Dyslipidemia control in type 2 diabetes: Experience of a Portuguese centre in the last decade. Atherosclerosis 2016. [DOI: 10.1016/j.atherosclerosis.2016.07.687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Baruselli P, Sá Filho M, Ambrósio A, Ferreira R. Estrategias para mejorar la fertilidad en bovinos: Inseminación artificial después del estro versus inseminación artificial a tiempo fijo. SPERMOVA 2016. [DOI: 10.18548/aspe/0003.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Clarivet B, Robin P, Pers YM, Ferreira R, Lebrun J, Jorgensen C, Hillaire-Buys D, Brés V, Faillie JL. Tocilizumab and mesenteric arterial thrombosis: drug-drug interaction with anticoagulants metabolized by CYP 450 and/or by P-glycoprotein. Eur J Clin Pharmacol 2016; 72:1413-1414. [PMID: 27457374 DOI: 10.1007/s00228-016-2107-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 07/19/2016] [Indexed: 11/30/2022]
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Cucco DC, Salles EL, Santos MR, Ferreira R, Soriano VS, Zampar A, Kessler JD. Freio de Ouro como ferramenta de seleção na raça Crioula. ARCHIVOS DE ZOOTECNIA 2016. [DOI: 10.21071/az.v65i250.482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
A principal prova da raça Crioula, o Freio de Ouro, é uma importante ferramenta de seleção, pois além de avaliar morfologia possui ainda nove provas funcionais com ou sem a presença de bovinos, as quais servem para avaliar a habilidade do equino em manobras e trabalhos corriqueiros. Este trabalho foi desenvolvido devido à importância econômica e social desta raça, aliado à escassez de estudos a respeito de melhoramento genético em equinocultura em nosso país. Foram coletadas informações sobre as premiações na Prova do Freio de Ouro, ao longo de todas as edições (1982 – 2014), bem como a genealogia, até à quinta geração, dos animais premiados neste período. Posteriormente, foram interpretados os resultados e analisadas as genealogias com o intuito de identificar a influência dos principais genearcas desta prova equestre. Observou-se que poucos garanhões são pais da grande maioria dos 165 animais premiados neste período. O Freio de Ouro pode ser considerada uma ferramenta de seleção, pois alguns animais premiados foram pais de animais também premiados. A grande maioria dos premiados nasceu no Brasil, sendo filhos de garanhões importados e mães nacionais. Alguns animais foram premiados em mais de uma oportunidade, porém nenhum conseguiu repetir o primeiro prêmio.
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Faria R, Dias R, Ferreira R, Pereira P, Inácio I, Leal B, Tavares A, Bettencourt A, Carvalho C, Almeida I, Marinho A, Martins da Silva B, Vasconcelos C. AB0504 HTR2A Polymorphisms Influence in Systemic Lupus Erythematous Clinical, Immunological Manifestation and Damage Accrual. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.6021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Ferreira R, Duarte C, Silva C, Eugénio G, Ndosi M, Gossec L, da Silva J. THU0602 Patient Global Assessment in Rheumatoid Arthritis Conveys A Variable Blend of Disease Activity and Disease Impact: A Cross-Sectional Study with 311 Patients. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Eugenio G, Ferreira R, Silva C, Duarte C, Silva J. THU0596 Physician's Global Assessment of Disease Activity in Rheumatoid Arthritis, Reflects Solely Objective Measures and Disregards Patient Reported Outcomes: Table 1. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Marques M, Ferreira R, Santiago M, Marques A, Machado P, da Silva J, Ndosi M. AB1069 The Educational Needs of People with Spondyloarthropathies (AS and PSA): A Cross-Sectional Study: Table 1. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Faustino-Rocha AI, Silva A, Gabriel J, Gil da Costa RM, Moutinho M, Oliveira PA, Gama A, Ferreira R, Ginja M. Long-term exercise training as a modulator of mammary cancer vascularization. Biomed Pharmacother 2016; 81:273-280. [PMID: 27261604 DOI: 10.1016/j.biopha.2016.04.030] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 04/12/2016] [Accepted: 04/12/2016] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Breast cancer remains a leading cause of death by cancer worldwide. It is commonly accepted that angiogenesis and the expression of angiogenic factors such as vascular endothelial growth factor-A (VEGF-A) is associated with the increased risk of metastasis and poor patient outcome. OBJECTIVE This work aimed to evaluate the effects of long-term exercise training on the growth and vascularization of mammary tumors in a rat model. MATERIALS AND METHODS Fifty female Sprague-Dawley rats were divided into four groups: two N-methyl-N-nitrosourea (MNU)-exposed groups (exercised and sedentary) and two control groups (exercised and sedentary). MNU was administered once, intraperitoneally at 7 weeks-old. Animals were then exercised on a treadmill for 35 weeks. Mammary tumors were evaluated using thermography, ultrasonography [Power Doppler (PDI), B Flow and contrast-enhanced ultrasound (CEUS)], and immunohistochemistry (VEGF-A). RESULTS Both, MNU sedentary and exercised groups showed 100% of tumor incidence, but exercised animals showed less tumors with an increased latency period. Exercise training also enhanced VEGF-A immunoexpression and vascularization (microvessel density, MVD) (p<0.05), and reduced histological aggressiveness. Ultrasound and thermal imaging analysis confirmed the enhanced vascularization of tumors on exercised animals. CONCLUSION Long-term exercise training increased VEGF-A expression, leading to enhanced tumor vascularization and reduced tumor burden, multiplicity and histological aggressiveness.
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Ferreira R, Fonseca MC, Santos T, Sargento-Freitas J, Tjeng R, Paiva F, Castelo-Branco M, Ferreira LS, Bernardino L. Retinoic acid-loaded polymeric nanoparticles enhance vascular regulation of neural stem cell survival and differentiation after ischaemia. NANOSCALE 2016; 8:8126-37. [PMID: 27025400 DOI: 10.1039/c5nr09077f] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Stroke is one of the leading causes of death and disability worldwide. However, current therapies only reach a small percentage of patients and may cause serious side effects. We propose the therapeutic use of retinoic acid-loaded nanoparticles (RA-NP) to safely and efficiently repair the ischaemic brain by creating a favourable pro-angiogenic environment that enhances neurogenesis and neuronal restitution. Our data showed that RA-NP enhanced endothelial cell proliferation and tubule network formation and protected against ischaemia-induced death. To evaluate the effect of RA-NP on vascular regulation of neural stem cell (NSC) survival and differentiation, endothelial cell-conditioned media (EC-CM) were collected. EC-CM from healthy RA-NP-treated cells reduced NSC death and promoted proliferation while EC-CM from ischaemic RA-NP-treated cells decreased cell death, increased proliferation and neuronal differentiation. In parallel, human endothelial progenitor cells (hEPC), which are part of the endogenous repair response to vascular injury, were collected from ischaemic stroke patients. hEPC treated with RA-NP had significantly higher proliferation, which further highlights the therapeutic potential of this formulation. To conclude, RA-NP protected endothelial cells from ischaemic death and stimulated the release of pro-survival, proliferation-stimulating factors and differentiation cues for NSC. RA-NP were shown to be up to 83-fold more efficient than free RA and to enhance hEPC proliferation. These data serve as a stepping stone to use RA-NP as vasculotrophic and neurogenic agents for vascular disorders and neurodegenerative diseases with compromised vasculature.
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