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Sarrazin SLF, Bourdineaud JP, Maia JGS, Mourão RHV, Oliveira RB. Antifungal chemosensitization through induction of oxidative stress: A model for control of candidiasis based on the Lippia origanoides essential oil. AN ACAD BRAS CIENC 2024; 96:e20230532. [PMID: 38597491 DOI: 10.1590/0001-3765202420230532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 08/07/2023] [Indexed: 04/11/2024] Open
Abstract
In this work, evaluated the antifungal chemosensitizing effect of the Lippia origanoides essential oil (EO) through the induction of oxidative stress. The EO was obtained by hydrodistillation and analyzed by GC-MS. To evaluate the antifungal chemosensitizing effect through induction of oxidative stress, cultures of the model yeast Saccharomyces cerevisiae ∆ycf1 were exposed to sub-inhibitory concentrations of the EO, and the expression of genes known, due be overexpressed in response to oxidative and mutagenic stress was analyzed by quantitative real-time polymerase chain reaction (qRT-PCR) method. Carvacrol and thymol were identified as the main components. The EO was effective in preventing or reducing the growth of the microorganisms tested. The gene expression profiles showed that EO promoted changes in the patterns of expression of genes involved in oxidative and mutagenic stress resistance. The combined use of the L. origanoides EO with fluconazole has been tested on Candida yeasts and the strategy resulted in a synergistic enhancement of the antifungal action of the azolic chemical product. Indeed, in association with EO, the fluconazole MICs dropped. Thus, the combinatorial use of L. origanoides EO as a chemosensitizer agent should contribute to enhancing the efficiency of conventional antifungal drugs, reducing their negative side effects.
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Affiliation(s)
- Sandra Layse F Sarrazin
- Programa de Pós-Graduação em Ciências da Saúde, Universidade Federal do Oeste doPará, Campus Tapajós, Bloco Modular I, Avenida Vera Paz, s/n, 68040-255 Santarém, PR, Brazil
| | - Jean-Paul Bourdineaud
- University of Bordeaux, CNRS, UMR 5234, Fundamental Microbiology and Pathogenicity Laboratory, European Institute of Chemistry and Biology, 2 Rue Robert Escarpit, 33607 Pessac, France
| | - José Guilherme S Maia
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Pará, Rua Augusto Corrêa, 01, Guamá, 66075-110 Belém, PA, Brazil
| | - Rosa Helena V Mourão
- Programa de Pós-Graduação Doutorado em Rede de Biodiversidade e Biotecnologia (BIONORTE/Polo Pará), Universidade Federal do Oeste do Pará, Campus Tapajós, Bloco Modular I, Avenida Vera Paz, s/n, 68040-255 Santarém, PR, Brazil
| | - Ricardo B Oliveira
- Programa de Pós-Graduação em Ciências da Saúde, Universidade Federal do Oeste doPará, Campus Tapajós, Bloco Modular I, Avenida Vera Paz, s/n, 68040-255 Santarém, PR, Brazil
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2
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Matheus VA, Oliveira RB, Maschio DA, Tada SFS, Soares GM, Mousovich-Neto F, Costa RG, Mori MA, Barbosa HCL, Collares-Buzato CB. Butyrate restores the fat/lean mass ratio balance and energy metabolism and reinforces the tight junction-mediated intestinal epithelial barrier in prediabetic mice independently of its anti-inflammatory and epigenetic actions. J Nutr Biochem 2023; 120:109409. [PMID: 37364792 DOI: 10.1016/j.jnutbio.2023.109409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 05/24/2023] [Accepted: 06/21/2023] [Indexed: 06/28/2023]
Abstract
Tissue/cellular actions of butyrate on energy metabolism and intestinal barrier in normal metabolic conditions or prediabetes are still unclear. In this work, we investigated the beneficial effect of dietary supplementation with sodium butyrate on energy metabolism, body mass composition, and intestinal epithelial barrier mediated by tight junction (TJ) in chow diet-fed normal and high-fat diet (HF)-fed prediabetic mice, considering the well-known butyrate action as an epigenetic and inflammatory regulator. Butyrate significantly reduced the fat/lean mass ratio, slightly ameliorated dyslipidemia, restored oral glucose tolerance, and increased basal energy expenditure in prediabetic HF-fed mice but had no effect on control animals. Such effects were observed in the absence of significant alterations in the hypothalamic expression of orexigenic and anorexigenic genes and motor activity. Also, butyrate suppressed the whitening effect of HF on brown adipose tissue but did not affect cell bioenergetics in immortalized UCP1-positive adipocytes in vitro. Butyrate reinforced the intestinal epithelial barrier in HF-fed mice and in Caco-2 monolayers, which involved higher trafficking of TJ proteins to the cell-cell contact region of the intestinal epithelia, without affecting TJ gene expression or the acetylation level of histones H3 and H4 in vivo. All metabolic and intestinal effects of butyrate in prediabetic mice occurred in the absence of detectable changes in systemic or local inflammation, or alterations in endotoxemia markers. Butyrate has no effect on chow diet-fed mice but, in the context of HF-induced prediabetes, it prevents metabolic and intestinal dysfunctions independently of its anti-inflammatory and epigenetic actions.
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Affiliation(s)
- Valquiria A Matheus
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.
| | - Ricardo B Oliveira
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Daniela A Maschio
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil; Obesity and Comorbidities Research Center, Institute of Biology, UNICAMP, Campinas, Brazil
| | - Susely F S Tada
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Gabriela M Soares
- Obesity and Comorbidities Research Center, Institute of Biology, UNICAMP, Campinas, Brazil
| | - Felippe Mousovich-Neto
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Raul G Costa
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Marcelo A Mori
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil; Obesity and Comorbidities Research Center, Institute of Biology, UNICAMP, Campinas, Brazil
| | - Helena C L Barbosa
- Obesity and Comorbidities Research Center, Institute of Biology, UNICAMP, Campinas, Brazil
| | - Carla B Collares-Buzato
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.
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3
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Manceau A, Bourdineaud JP, Oliveira RB, Sarrazin SLF, Krabbenhoft DP, Eagles-Smith CA, Ackerman JT, Stewart AR, Ward-Deitrich C, Del Castillo Busto ME, Goenaga-Infante H, Wack A, Retegan M, Detlefs B, Glatzel P, Bustamante P, Nagy KL, Poulin BA. Demethylation of Methylmercury in Bird, Fish, and Earthworm. Environ Sci Technol 2021; 55:1527-1534. [PMID: 33476127 DOI: 10.1021/acs.est.0c04948] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Toxicity of methylmercury (MeHg) to wildlife and humans results from its binding to cysteine residues of proteins, forming MeHg-cysteinate (MeHgCys) complexes that hinder biological functions. MeHgCys complexes can be detoxified in vivo, yet how this occurs is unknown. We report that MeHgCys complexes are transformed into selenocysteinate [Hg(Sec)4] complexes in multiple animals from two phyla (a waterbird, freshwater fish, and earthworms) sampled in different geographical areas and contaminated by different Hg sources. In addition, high energy-resolution X-ray absorption spectroscopy (HR-XANES) and chromatography-inductively coupled plasma mass spectrometry of the waterbird liver support the binding of Hg(Sec)4 to selenoprotein P and biomineralization of Hg(Sec)4 to chemically inert nanoparticulate mercury selenide (HgSe). The results provide a foundation for understanding mercury detoxification in higher organisms and suggest that the identified MeHgCys to Hg(Sec)4 demethylation pathway is common in nature.
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Affiliation(s)
- Alain Manceau
- Université Grenoble Alpes, ISTerre, CNRS, Grenoble 38000, France
| | - Jean-Paul Bourdineaud
- Université de Bordeaux, Institut Européen de Chimie et Biologie, CNRS, Pessac 33600, France
| | - Ricardo B Oliveira
- Universidade Federal do Oeste Pará, LabBBEx, Santarém 68180-000, Pará, Brazil
| | - Sandra L F Sarrazin
- Universidade Federal do Oeste Pará, LabBBEx, Santarém 68180-000, Pará, Brazil
| | - David P Krabbenhoft
- Upper Midwest Water Science Center, U.S. Geological Survey, Middleton 53562, Wisconsin, United States
| | - Collin A Eagles-Smith
- Forest and Rangeland Ecosystem Science Center, U.S. Geological Survey, Corvallis 97330, Oregon, United States
| | - Joshua T Ackerman
- Western Ecological Research Center, U.S. Geological Survey, Dixon Field Station, Dixon 95620, California, United States
| | - A Robin Stewart
- U.S. Geological Survey, Water Resources Mission Area, Menlo Park 94025, California, United States
| | | | | | | | - Aude Wack
- Université Grenoble Alpes, ISTerre, CNRS, Grenoble 38000, France
| | - Marius Retegan
- European Synchrotron Radiation Facility (ESRF), Grenoble 38000, France
| | - Blanka Detlefs
- European Synchrotron Radiation Facility (ESRF), Grenoble 38000, France
| | - Pieter Glatzel
- European Synchrotron Radiation Facility (ESRF), Grenoble 38000, France
| | - Paco Bustamante
- Université La Rochelle, CNRS, Littoral Environnement et Sociétés, La Rochelle 17000, France
| | - Kathryn L Nagy
- Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago 60607, Illinois, United States
| | - Brett A Poulin
- U.S. Geological Survey, Water Resources Mission Area, Boulder 80303, Colorado, United States
- Department of Environmental Toxicology, University of California Davis, Davis 95616, California, United States
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Oliveira CQ, Oliveira RB, Brasil IA, Junior LL, Mendes E, Monteiro WD, Farinatti P. Four-second dynamic exercise testing (T4S) for the assessment of cardiac vagal modulation in obese adolescents. Physiol Meas 2019; 40:115003. [PMID: 31627205 DOI: 10.1088/1361-6579/ab4f1d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
BACKGROUND Reduced vagal activity is often present in obese adolescents. Simple and practical strategies for the assessment of isolate parasympathetic outflow in this population are therefore useful. OBJECTIVES To compare the methods derived from heart rate variability (HRV) analysis at rest and 4 s exercise testing (T4S) for the assessment of cardiac parasympathetic modulation in adolescents classified as obese (OB) or with normal weight (NW). Additionally, associations between total and trunk fat versus autonomic modulation determined by the two methods were calculated. APPROACH A cross-sectional study was conducted with 50 adolescents (26 OB and 24 NW, 14.7 ± 1.5 years), comparing autonomic indices provided by HRV and T4S. Body fractioning was determined employing dual-energy x-ray absorptiometry (DXA). MAIN RESULTS The cardiac vagal index (CVI) obtained from T4S and standard time- and frequency-domain HRV measures were lower in OB versus NW (P ⩽ 0.05). Correlations between CVI and HRV indices of cardiac vagal modulation were as follows: CVI versus RMSSD (r = 0.44; P = 0.003); CVI versus pNN50 (r = 0.32; P = 0.04); CVI versus HF (r = 0.35; P = 0.02). Associations between body fat, android/gynoid ratio, and percent trunk fat versus CVI were of similar magnitude and direction than versus HRV indices. SIGNIFICANCE The T4S proved to be adequate to detect cardiac parasympathetic impairment in obese adolescents. Moreover, vagal modulation assessed by HRV and T4S inversely correlated with visceral adipose tissue. These findings along with the simplicity and safety of the T4S should encourage its use in the assessment of cardiac parasympathetic modulation in obese pediatric populations.
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5
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Signorelli GR, Lehocki F, Mora Fernández M, O'Neill G, O'Connor D, Brennan L, Monteiro-Guerra F, Rivero-Rodriguez A, Hors-Fraile S, Munoz-Penas J, Bonjorn Dalmau M, Mota J, Oliveira RB, Mrinakova B, Putekova S, Muro N, Zambrana F, Garcia-Gomez JM. A Research Roadmap: Connected Health as an Enabler of Cancer Patient Support. J Med Internet Res 2019; 21:e14360. [PMID: 31663861 PMCID: PMC6914240 DOI: 10.2196/14360] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [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: 04/12/2019] [Revised: 08/07/2019] [Accepted: 08/25/2019] [Indexed: 12/30/2022] Open
Abstract
The evidence that quality of life is a positive variable for the survival of cancer patients has prompted the interest of the health and pharmaceutical industry in considering that variable as a final clinical outcome. Sustained improvements in cancer care in recent years have resulted in increased numbers of people living with and beyond cancer, with increased attention being placed on improving quality of life for those individuals. Connected Health provides the foundations for the transformation of cancer care into a patient-centric model, focused on providing fully connected, personalized support and therapy for the unique needs of each patient.
Connected Health creates an opportunity to overcome barriers to health care support among patients diagnosed with chronic conditions. This paper provides an overview of important areas for the foundations of the creation of a new Connected Health paradigm in cancer care. Here we discuss the capabilities of mobile and wearable technologies; we also discuss pervasive and persuasive strategies and device systems to provide multidisciplinary and inclusive approaches for cancer patients for mental well-being, physical activity promotion, and rehabilitation.
Several examples already show that there is enthusiasm in strengthening the possibilities offered by Connected Health in persuasive and pervasive technology in cancer care. Developments harnessing the Internet of Things, personalization, patient-centered design, and artificial intelligence help to monitor and assess the health status of cancer patients. Furthermore, this paper analyses the data infrastructure ecosystem for Connected Health and its semantic interoperability with the Connected Health economy ecosystem and its associated barriers. Interoperability is essential when developing Connected Health solutions that integrate with health systems and electronic health records.
Given the exponential business growth of the Connected Health economy, there is an urgent need to develop mHealth (mobile health) exponentially, making it both an attractive and challenging market. In conclusion, there is a need for user-centered and multidisciplinary standards of practice to the design, development, evaluation, and implementation of Connected Health interventions in cancer care to ensure their acceptability, practicality, feasibility, effectiveness, affordability, safety, and equity.
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Affiliation(s)
- Gabriel Ruiz Signorelli
- Oncoavanze, Seville, Spain.,Sport & Society Research Group, Faculty of Educational Sciences, University of Seville, Seville, Spain.,Insight Centre for Data Analytics, O'Brien Centre for Science, University College Dublin, Belfield Campus, Dublin, Ireland
| | - Fedor Lehocki
- Slovak University of Technology in Bratislava, Bratislava, Slovakia.,National Centre of Telemedicine Services, Bratislava, Slovakia
| | - Matilde Mora Fernández
- Sport & Society Research Group, Faculty of Educational Sciences, University of Seville, Seville, Spain
| | - Gillian O'Neill
- Insight Centre for Data Analytics, O'Brien Centre for Science, University College Dublin, Belfield Campus, Dublin, Ireland
| | - Dominic O'Connor
- Insight Centre for Data Analytics, O'Brien Centre for Science, University College Dublin, Belfield Campus, Dublin, Ireland
| | - Louise Brennan
- Insight Centre for Data Analytics, O'Brien Centre for Science, University College Dublin, Belfield Campus, Dublin, Ireland.,Beacon Hospital, Dublin, Ireland
| | - Francisco Monteiro-Guerra
- Insight Centre for Data Analytics, O'Brien Centre for Science, University College Dublin, Belfield Campus, Dublin, Ireland.,Salumedia Tecnologías, Seville, Spain
| | | | - Santiago Hors-Fraile
- Salumedia Tecnologías, Seville, Spain.,Maastricht University, Maastricht, Netherlands.,Architecture and Computer Technology Department, University of Seville, Seville, Spain
| | | | | | - Jorge Mota
- Research Centre in Physical Activity, Health and Leisure, Faculty of Sport, University of Porto, Porto, Portugal
| | - Ricardo B Oliveira
- Laboratory of Active Living, Institute of Physical Education and Sports, University of Rio de Janeiro State, Rio de Janeiro, Brazil
| | - Bela Mrinakova
- First Department of Oncology, Comenius University, Bratislava, Slovakia
| | - Silvia Putekova
- Faculty of Health Care and Social Work, University of Trnava, Trnava, Slovakia
| | - Naiara Muro
- Laboratoire d'informatique médicale et d'ingénierie des connaissances en e-Santé, Sorbonne Universités, Paris, France.,eHealth and Biomedical Applications, Vicomtech, Donostia-San Sebastian, Spain.,Biodonostia, Donostia-San Sebastián, Spain
| | - Francisco Zambrana
- Department of Oncology, Infanta Sofia University Hospital, Madrid, Spain
| | - Juan M Garcia-Gomez
- Biomedical Data Science Lab, The Institute of Information and Communication Technologies, Universitat Politecnica de Valencia, Valencia, Spain
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6
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Galhardo A, Cardoso JP, Kanhouche G, Junior VS, Lima VM, Sato DN, Oliveira RB, Reis GC, Souza CGS, Corhs FM, Junior IG, Moises VA, Carvalho AC, Moraes PIM, Alves CMR. P5522ST elevation myocardial infarction networks: relationship of hub-spoke distance with transfer time and clinical outcomes in rescue PCI. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
In the establishment of ST elevation myocardial infarction (STEMI) systems of care, transfer times between primary care units (PCU) and the cardiac catheterization lab (CCL) are pillars to therapeutic success. Objective: To analyze the relationship between PCU-CCL distance with transport time and main clinical outcomes in STEMI patients (p) treated with pharmaco-invasive therapy (PIT) and referred for rescue PCI after failed fibrinolysis.
Methods
Between January 2010 and December 2018, of the 2241 patients who received tenecteplase in PCU inserted in a large city STEMI network, 801 (35.7%) evolved without reperfusion criteria after 90 minutes (persistence of chest pain, less than 50% reduction on ST elevation or hemodynamic instability), being urgently transferred to the CCL. The PCU were divided according to the distance to the tertiary center in Group 1: between 5 and 9km (N=208p), Group 2: between 16 and 18km (N=315p) and Group 3: between 22 and 30km=266p). Considering an alpha of 0.05, sample size n=801 and an effect size of 0.11, a power of 0.80 was obtained.
Results
The groups were comparable for baseline features (Table 1). Group 2 (intermediate distances) had the highest median transport time (G1 260 interquartile 145–437 min vs G2 355 interquartile 206–573 min vs G3 241 interquartile 125–418 min; p<0.01 for G2). There were no differences between the groups regarding cardiogenic shock (G1 24.5% vs G2 23.3% vs G3 24.1%, p=0.9) or in-hospital death (G1 17.4% vs G2 12.3% vs G3 13.0%, p=0.2).
Table 1. Group's baseline features G1: Short distances G2: Intermediate distances G3: Long distances p value (5–9 km) N=208 (16–18 km) N=315 (22–30 km) N=266 Age (median) 57.5 (51–64) 57 (49–66) 59 (52–67) 0.27 Female 29.7% 28.3% 35.1% 0.19 Hypertension 67.3% 60.9% 64.4% 0.31 Diabetes 37.0% 32.1% 37.8% 0.30 Renal failure 10.3% 9.7% 6.3% 0.21 Anterior STEMI 56.1% 58.4% 62.4% 0.36 Pain-to-needle time (median min) 197.5 (137–330) 195 (120–295) 195 (125–345) 0.38
Conclusion
In STEMI patients with failed fibrinolysis treated with pharmaco-invasive therapy, the PCU-CCL distance was not related to transfer time or to outcomes of in-hospital death and cardiogenic shock. The longer transport time of hospitals located at intermediate distance can possibly reflect local logistical difficulties and are not due to hub-spoke distance. Continuous improvement in structuring and coordination of public STEMI networks is aimed.
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Affiliation(s)
- A Galhardo
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - J P Cardoso
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - G Kanhouche
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - V S Junior
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - V M Lima
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - D N Sato
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - R B Oliveira
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - G C Reis
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - C G S Souza
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - F M Corhs
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - I G Junior
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - V A Moises
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - A C Carvalho
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - P I M Moraes
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
| | - C M R Alves
- Federal University of Sao Paulo (UNIFESP), Sao Paulo, Brazil
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7
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Lopes GO, Farinatti P, Lopes KG, Medeiros-Lima DJ, Matsuura C, Oliveira RB, Bouskela E, Bottino DA, Muccillo F, Tibirica E, Borges JP. Increased vascular function and superoxide dismutase activity in physically active vs inactive adults living with HIV. Scand J Med Sci Sports 2018; 29:25-33. [PMID: 30267551 DOI: 10.1111/sms.13312] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 03/09/2018] [Revised: 08/28/2018] [Accepted: 09/20/2018] [Indexed: 12/28/2022]
Abstract
This study compared macro- and microvascular endothelial function and redox status in active vs inactive HIV-infected patients (HIVP) under antiretroviral therapy. Using a cross-sectional design, macro- and microvascular reactivity, systemic microvascular density, and oxidative stress were compared between 19 HIVP (53.1 ± 6.1 year) enrolled in a multimodal training program (aerobic, strength and flexibility exercises) for at least 12 months (60-minutes sessions performed 3 times/wk with moderate intensity) vs 25 sedentary HIVP (51.2 ± 6.3 year). Forearm blood flow during reactive hyperemia (521.7 ± 241.9 vs 361.4% ± 125.0%; P = 0.04) and systemic microvascular density (120.8 ± 21.1 vs 105.6 ± 25.0 capillaries/mm2 ; P = 0.03) was greater in active than inactive patients. No significant difference between groups was detected for endothelium-dependent and independent skin microvascular vasodilation (P > 0.05). As for redox status, carbonyl groups (P = 0.22), lipid peroxidation (P = 0.86), catalase activity (P = 0.99), and nitric oxide levels (P = 0.72) were similar across groups. However, superoxide dismutase activity was greater in active vs inactive HIVP (0.118 ± 0.013 vs 0.111 ± 0.007 U/mL; P = 0.05). Immune function reflected by total T CD4 and T CD8 counts (cell/mm3 ) did not differ between active and inactive groups (P > 0.82). In conclusion, physically active HIVP exhibited similar immune function, but greater macrovascular reactivity, systemic microvascular density, and superoxide dismutase activity than inactive patients of similar age.
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Affiliation(s)
- Gabriella O Lopes
- Laboratory of Physical Activity and Health Promotion, Institute of Physical Education and Sports, University of Rio de Janeiro State, Rio de Janeiro, Brazil.,Graduate Program in Exercise and Sports Sciences, University of Rio de Janeiro State, Rio de Janeiro, Brazil
| | - Paulo Farinatti
- Laboratory of Physical Activity and Health Promotion, Institute of Physical Education and Sports, University of Rio de Janeiro State, Rio de Janeiro, Brazil.,Graduate Program in Exercise and Sports Sciences, University of Rio de Janeiro State, Rio de Janeiro, Brazil.,Graduate Program in Physical Activity Sciences, Salgado de Oliveira University, Niteroi, Brazil
| | - Karynne G Lopes
- Laboratory of Physical Activity and Health Promotion, Institute of Physical Education and Sports, University of Rio de Janeiro State, Rio de Janeiro, Brazil.,Clinical and Experimental Research Laboratory on Vascular Biology (BioVasc), Biomedical Center, University of Rio de Janeiro State, Rio de Janeiro, Brazil
| | - Daniel J Medeiros-Lima
- Department of Pharmacology and Psychobiology, University of Rio de Janeiro State, Rio de Janeiro, Brazil
| | - Cristiane Matsuura
- Department of Pharmacology and Psychobiology, University of Rio de Janeiro State, Rio de Janeiro, Brazil
| | - Ricardo B Oliveira
- Laboratory of Physical Activity and Health Promotion, Institute of Physical Education and Sports, University of Rio de Janeiro State, Rio de Janeiro, Brazil.,Graduate Program in Exercise and Sports Sciences, University of Rio de Janeiro State, Rio de Janeiro, Brazil
| | - Eliete Bouskela
- Clinical and Experimental Research Laboratory on Vascular Biology (BioVasc), Biomedical Center, University of Rio de Janeiro State, Rio de Janeiro, Brazil
| | - Daniel A Bottino
- Clinical and Experimental Research Laboratory on Vascular Biology (BioVasc), Biomedical Center, University of Rio de Janeiro State, Rio de Janeiro, Brazil
| | - Fabiana Muccillo
- National Institute of Cardiology, Ministry of Health, Rio de Janeiro, Brazil
| | - Eduardo Tibirica
- National Institute of Cardiology, Ministry of Health, Rio de Janeiro, Brazil
| | - Juliana P Borges
- Laboratory of Physical Activity and Health Promotion, Institute of Physical Education and Sports, University of Rio de Janeiro State, Rio de Janeiro, Brazil.,Graduate Program in Exercise and Sports Sciences, University of Rio de Janeiro State, Rio de Janeiro, Brazil
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8
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Alcântara BGV, Zanini LBL, Fernandes VHC, Casoti R, Soares MG, Dias DF, Oliveira RB, Chagas-Paula DA. Metabolomic approach to predict new anti-inflammatory extracts with in vivo outstanding mechanism of action. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- BGV Alcântara
- Federal University of Alfenas, UNIFAL-MG, Alfenas, Brazil
| | - LBL Zanini
- Federal University of Alfenas, UNIFAL-MG, Alfenas, Brazil
| | - VHC Fernandes
- Federal University of Alfenas, UNIFAL-MG, Alfenas, Brazil
| | - R Casoti
- Universtiy of São Paulo, FCFRP-USP, Ribeirão Preto, Brazil
| | - MG Soares
- Federal University of Alfenas, UNIFAL-MG, Alfenas, Brazil
| | - DF Dias
- Federal University of Alfenas, UNIFAL-MG, Alfenas, Brazil
| | - RB Oliveira
- Federal Technological University of Paraná, Santa Helena, Brazil
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9
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Matheus VA, Monteiro L, Oliveira RB, Maschio DA, Collares-Buzato CB. Butyrate reduces high-fat diet-induced metabolic alterations, hepatic steatosis and pancreatic beta cell and intestinal barrier dysfunctions in prediabetic mice. Exp Biol Med (Maywood) 2017; 242:1214-1226. [PMID: 28504618 DOI: 10.1177/1535370217708188] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
In this study, we investigated the effect of diet supplementation with sodium butyrate (5% w/w), a short-chain fatty acid produced by the intestinal microbiota, on metabolic parameters, body adiposity, hepatic and pancreatic lipid accumulation, beta cell function/mass as well as on the structure and function of the tight junction-mediated intestinal epithelial barrier in both normal and obese/prediabetic C57 mice fed a regular (control) or high-fat diet for 60 days, respectively. Butyrate treatment significantly inhibited all the high-fat-induced metabolic dysfunctions evaluated, i.e. significantly reduced the weight gain and body adiposity as well as the insulin resistant state, hyperglycemia and hyperinsulinemia, without changing food intake. In addition, high-fat-fed mice treated with this short-chain fatty acid displayed no compensatory hyperplasia of pancreatic beta cells nor marked hepatic steatosis as seen in prediabetic mice after high-fat diet only. Isolated pancreatic islets from high-fat-fed mice treated with butyrate showed improvement of the insulin secretion, which was associated with a significant decrease in lipid accumulation within the pancreas. Butyrate enhanced the intestinal epithelial barrier, as revealed by the FITC-Dextran permeability assay, which was accompanied by a significant increase in the junctional content of the tight junction-associated claudin-1 in intestinal epithelia of jejunum, ileum, and colon of both control and high-fat mice. In conclusion, our results showed that diet supplementation with butyrate inhibits the deleterious effects of high-fat diet intake on metabolic parameters and structure/function of several tissues/organs associated with type 2 diabetes mellitus in a mouse model, suggesting a potential use of this short-chain fatty acid in the treatment of this endocrine-metabolic disorder. Impact statement Butyrate is a short-chain fatty acid produced by the intestinal microbiota through the fermentation of non-absorbable carbohydrates and proteins (e.g. fibers). Sodium butyrate incorporated into the diet displayed a protective action on metabolic, hepatic, pancreatic and intestinal alterations induced by high-fat diet in mice, resulting in significant inhibition of the development of a prediabetic state. Thus, our data suggest that butyrate may have a potential therapeutic use in the treatment of type 2 diabetes and related disorders.
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Affiliation(s)
- V A Matheus
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, CEP 13083-970, Brazil
| | - Lcs Monteiro
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, CEP 13083-970, Brazil
| | - R B Oliveira
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, CEP 13083-970, Brazil
| | - D A Maschio
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, CEP 13083-970, Brazil
| | - C B Collares-Buzato
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, CEP 13083-970, Brazil
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Próspero AG, Quini CC, Bakuzis AF, Fidelis-de-Oliveira P, Moretto GM, Mello FPF, Calabresi MFF, Matos RVR, Zandoná EA, Zufelato N, Oliveira RB, Miranda JRA. Real-time in vivo monitoring of magnetic nanoparticles in the bloodstream by AC biosusceptometry. J Nanobiotechnology 2017; 15:22. [PMID: 28327191 PMCID: PMC5361818 DOI: 10.1186/s12951-017-0257-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 03/10/2017] [Indexed: 12/21/2022] Open
Abstract
Background We introduce and demonstrate that the AC biosusceptometry (ACB) technique enables real-time monitoring of magnetic nanoparticles (MNPs) in the bloodstream. We present an ACB system as a simple, portable, versatile, non-invasive, and accessible tool to study pharmacokinetic parameters of MNPs, such as circulation time, in real time. We synthesized and monitored manganese doped iron oxide nanoparticles in the bloodstream of Wistar rats using two different injection protocols. Aiming towards a translational approach, we also simultaneously evaluated cardiovascular parameters, including mean arterial pressure, heart rate, and episodes of arrhythmia in order to secure the well-being of all animals. Results We found that serial injections increased the circulation time compared with single injections. Immediately after each injection, we observed a transitory drop in arterial pressure, a small drop in heart rate, and no episodes of arrhythmia. Although some cardiovascular effects were observed, they were transitory and easily recovered in both protocols. Conclusions These results indicate that the ACB system may be a valuable tool for in vivo, real-time MNP monitoring that allows associations with other techniques, such as pulsatile arterial pressure and electrocardiogram recordings, helping ensuring the protocol safety, which is a fundamental step towards clinical applications. Electronic supplementary material The online version of this article (doi:10.1186/s12951-017-0257-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- André G Próspero
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Caio C Quini
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Andris F Bakuzis
- Physics Institute, Federal University of Goiás, Goiânia, Goiás, Brazil. .,Instituto de Física-Universidade Federal de Goiás, Goiânia, GO, 74690-900, Brazil.
| | | | - Gustavo M Moretto
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Fábio P F Mello
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Marcos F F Calabresi
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Ronaldo V R Matos
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Ednaldo A Zandoná
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Nícholas Zufelato
- Physics Institute, Federal University of Goiás, Goiânia, Goiás, Brazil
| | - Ricardo B Oliveira
- Ribeirão Preto School of Medicine, São Paulo University, Ribeirão Prêto, São Paulo, Brazil
| | - José R A Miranda
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, Brazil
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11
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Saccol EMH, Londero ÉP, Bressan CA, Salbego J, Gressler LT, Silva LVF, Mourão RHV, Oliveira RB, Llesuy SF, Baldisserotto B, Pavanato MA. Oxidative and biochemical responses in Brycon amazonicus anesthetized and sedated with Myrcia sylvatica (G. Mey.) DC. and Curcuma longa L. essential oils. Vet Anaesth Analg 2017; 44:555-566. [PMID: 28566223 DOI: 10.1016/j.vaa.2016.08.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [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: 02/12/2016] [Revised: 08/29/2016] [Accepted: 08/30/2016] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To investigate the effects of rapid anesthesia and long-term sedation with the essential oils (EOs) of Myrcia sylvatica (EOMS) and Curcuma longa (EOCL) on biochemical and oxidative parameters in matrinxã. STUDY DESIGN Prospective, randomized, laboratory experiment. ANIMALS A total of 72 matrinxã (Brycon amazonicus) adults weighing 404.8 ± 27.9 g were divided into eight groups of nine fish. METHODS Biochemical and oxidative effects were investigated in plasma and tissues of matrinxã subjected to rapid anesthesia (5 minutes) or long-term sedation (360 minutes, simulating the practice of transport) with EOMS (200 μL L-1 and 10 μL L-1, respectively) and EOCL (500 μL L-1 and 40 μL L-1, respectively). RESULTS Transport simulation without sedation or anesthesia increased lipid peroxidation levels in the gills and kidney of fish in the control group. Anesthesia and sedation with EOs decreased cortisol concentrations and increased lactate concentrations compared with controls. Lipid peroxidation was lower in the brain, gills, liver and kidney of sedated and anesthetized fish, than in the control group. Anesthesia with EOs increased the activity of superoxide dismutase and glutathione-S-transferase in the brain, and catalase in the liver and gills, compared with controls. Long-term sedation with EOs increased superoxide dismutase, glutathione peroxidase and glutathione reductase activities in the brain, catalase in the liver, glutathione peroxidase and glutathione reductase in the gills and superoxide dismutase in the kidney. In general, nonprotein thiols content and total reactive antioxidant potential of tissues were higher after anesthesia and sedation with EOs compared with the control group. CONCLUSIONS AND CLINICAL RELEVANCE The concentrations of EOMS and EOCL used were effective at preventing a stress response and excess of reactive oxygen species formation. For these reasons, these substances may be recommended for use in the transportation of fish to improve survival and animal welfare.
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Affiliation(s)
- Etiane M H Saccol
- Department of Physiology and Pharmacology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Érika P Londero
- Department of Physiology and Pharmacology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Caroline A Bressan
- Department of Physiology and Pharmacology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Joseânia Salbego
- Department of Physiology and Pharmacology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Luciane T Gressler
- Department of Physiology and Pharmacology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Lenise V F Silva
- Institute of Science and Technology of Water, Federal University of Para West (UFOPA), Santarém, PA, Brazil
| | - Rosa H V Mourão
- Institute of Biodiversity and Forests, UFOPA, Santarém, PA, Brazil
| | | | - Susana F Llesuy
- Department of General and Inorganic Chemistry, University of Buenos Aires (UBA), Buenos Aires, Argentina
| | - Bernardo Baldisserotto
- Department of Physiology and Pharmacology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil
| | - Maria A Pavanato
- Department of Physiology and Pharmacology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil.
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12
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Sakamoto M, Kakita A, Domingo JL, Yamazaki H, Oliveira RB, Sarrazin SLF, Eto K, Murata K. Stable and episodic/bolus patterns of methylmercury exposure on mercury accumulation and histopathologic alterations in the nervous system. Environ Res 2017; 152:446-453. [PMID: 27450633 DOI: 10.1016/j.envres.2016.06.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 01/05/2016] [Revised: 05/06/2016] [Accepted: 06/20/2016] [Indexed: 06/06/2023]
Abstract
The main purpose of the present study was to compare the blood and brain mercury (Hg) accumulation and neurological alterations in adult male and pregnant female/fetal rats following stable and episodic/bolus patterns of methylmercury (MeHg) exposure. In addition, MeHg accumulation in the human body was estimated by a one-compartment model using three different patterns of MeHg exposure. In the adult male rat experiment, doses of 0.3 and 1.5mg MeHg/kg/day were orally administered to the stable groups for 5 weeks, while 7-fold higher doses of 2.1 and 10.5mg MeHg/kg/once a week were administered to the bolus groups. The blood Hg levels increased constantly in the stable groups, but increased with repeated waves in the bolus groups. At completion of the experiment, there were no significant differences in the brain Hg concentrations or neurological alterations between the stable and bolus groups, when the total doses of MeHg were the same. In the pregnant female rat experiment, a dose of 1mg MeHg/kg/day was administered orally to the stable group for 20 days (until 1day before expected parturition), while a 5-fold higher dose of 5mg MeHg/kg/once every 5 days was administered to the bolus group. In the brains of the maternal/fetal rats, there were no significant differences in the Hg concentrations and neurological alterations between the stable and bolus groups. The mean Hg concentrations in the fetal brains were approximately 2-fold higher than those in the maternal brains for both stable and bolus groups. Using the one-compartment model, the Hg accumulation curves in humans at doses of 7µg MeHg/day, 48µg MeHg/once a week, and 96µg MeHg/once every 2 weeks were estimated to be similar, while the bolus groups showed dose-dependent amplitudes of repeated waves. These results suggest that stable and episodic/bolus patterns of MeHg exposure do not cause differences in Hg accumulation in the blood and brain, or in neurological alterations, when the total doses are the same.
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Affiliation(s)
- Mineshi Sakamoto
- National Institute for Minamata Disease, Kumamoto, Japan; Universidade Federal do Oeste do Pará, ICED-PPGBIO-PPGRNA-LABBEX, Santarém, Brazil.
| | - Akiyoshi Kakita
- Brain Research Institute, Niigata University, Niigata, Japan
| | - José L Domingo
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Universitat "Rovira I Virgili", Reus, Spain
| | - Hiroshi Yamazaki
- Laboratory of Drug Metabolism and Pharmacokinetics, Showa Pharmaceutical University, Tokyo, Japan
| | - Ricardo B Oliveira
- Universidade Federal do Oeste do Pará, ICED-PPGBIO-PPGRNA-LABBEX, Santarém, Brazil
| | - Sandra L F Sarrazin
- Universidade Federal do Oeste do Pará, ICED-PPGBIO-PPGRNA-LABBEX, Santarém, Brazil
| | - Komyo Eto
- National Institute for Minamata Disease, Kumamoto, Japan
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Sakamoto M, Murata K, Domingo JL, Yamamoto M, Oliveira RB, Kawakami S, Nakamura M. Corrigendum to "Implications of mercury concentrations in umbilical cord tissue in relation to maternal hair segments as biomarkers for prenatal exposure to methylmercury" by Sakamoto et al. [Environ. Res. 149 (2016) 282-287]. Environ Res 2016; 151:821. [PMID: 27477948 DOI: 10.1016/j.envres.2016.07.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- Mineshi Sakamoto
- National Institute for Minamata Disease, Kumamoto 867-0008, Japan; Obstetrics and Gynecology, Fukuda Hospital, Kumamoto 860-0004, Japan
| | | | - José L Domingo
- School of Medicine, IISPV, Universitat "Rovira I Virgili", Reus, Spain
| | - Megumi Yamamoto
- National Institute for Minamata Disease, Kumamoto 867-0008, Japan
| | | | - Shoichi Kawakami
- Obstetrics and Gynecology, Fukuda Hospital, Kumamoto 860-0004, Japan
| | - Masaaki Nakamura
- National Institute for Minamata Disease, Kumamoto 867-0008, Japan
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Sakamoto M, Murata K, Domingo JL, Yamamoto M, Oliveira RB, Kawakami S, Nakamura M. Implications of mercury concentrations in umbilical cord tissue in relation to maternal hair segments as biomarkers for prenatal exposure to methylmercury. Environ Res 2016; 149:282-287. [PMID: 27156841 DOI: 10.1016/j.envres.2016.04.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 12/24/2015] [Revised: 04/07/2016] [Accepted: 04/18/2016] [Indexed: 06/05/2023]
Abstract
In this study, we investigated how mercury (Hg) concentrations in umbilical cord tissue are correlated with those in biomarkers for prenatal exposure to methylmercury (MeHg). Total Hg (T-Hg) concentrations were measured in 54 mother-child paired samples of maternal blood, umbilical cord tissue, cord blood, and maternal hair segments (1-cm incremental segments from the scalp) collected at parturition. MeHg concentrations were also measured in the cord tissue. Median T-Hg and MeHg concentrations in cord tissue on a dry-weight basis (d.w.) were 62.2ng/g and 56.7ng/g, respectively. Proportions of MeHg to T-Hg were approximately 95%. Both T-Hg and MeHg in cord tissue (d.w.) showed better correlations with T-Hg in cord blood than did T-Hg in cord tissue on a wet-weight basis (w.w.). Median T-Hg concentrations in maternal blood, cord blood, and maternal hair (0-1cm from the scalp) were 3.79ng/g, 7.26ng/g, and 1.35 μg/g, respectively. Median T-Hg concentration in cord blood was 1.92 times higher than that in maternal blood. T-Hg in cord tissue (d.w.) showed a strong correlation with that in cord blood (r=0.912, p<0.01). Among the hair segments, T-Hg in cord tissue (d.w.) showed the strongest correlation (r=0.854, p<0.01) with that in maternal hair at 0-1cm from the scalp, reflecting growth for approximately 1 month before parturition. Based on the present results, T-Hg and MeHg concentrations in cord tissue may be useful biomarkers for prenatal MeHg exposure of the fetus, especially reflecting the maternal MeHg body burden during late gestation. The conversion factors for T-Hg and MeHg concentrations in cord tissue (d.w.) to T-Hg concentrations in maternal hair (0-1cm from the scalp) were calculated to be 22.37 and 24.09, respectively. This information will be useful for evaluating maternal MeHg exposure levels in retrospective studies using preserved umbilical cord tissue.
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Affiliation(s)
- Mineshi Sakamoto
- National Institute for Minamata Disease, Kumamoto 867-0008, Japan; Obstetrics and Gynecology, Fukuda Hospital, Kumamoto 860-0004, Japan.
| | | | - José L Domingo
- School of Medicine, IISPV, Universitat "Rovira I Virgili", Reus, Spain
| | - Megumi Yamamoto
- National Institute for Minamata Disease, Kumamoto 867-0008, Japan
| | | | - Shoichi Kawakami
- Obstetrics and Gynecology, Fukuda Hospital, Kumamoto 860-0004, Japan
| | - Masaaki Nakamura
- National Institute for Minamata Disease, Kumamoto 867-0008, Japan
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15
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Sarrazin SLF, da Silva LA, Oliveira RB, Raposo JDA, da Silva JKR, Salimena FRG, Maia JGS, Mourão RHV. Antibacterial action against food-borne microorganisms and antioxidant activity of carvacrol-rich oil from Lippia origanoides Kunth. Lipids Health Dis 2015; 14:145. [PMID: 26552874 PMCID: PMC4640387 DOI: 10.1186/s12944-015-0146-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 10/28/2015] [Indexed: 11/21/2022] Open
Abstract
Background Lippia origanoides Kunth from Northeast Brazil is a plant of pleasant odor used by local people as a food seasoning in substitution the oregano where its carvacrol-rich oil has showed significant antimicrobial activity against human pathogens. Methods GC and GC-MS analyzed the plant oil composition and its antibacterial activity was evaluated by disk diffusion and microdilution broth methods. The determination of oil antioxidant activity was made by DPPH radical scavenging assay. Oil toxicity was performed on mice. Results The main constituents of the oil were carvacrol (47.2 %), thymol (12.8 %), p-cymene (9.7 %), and p-methoxythymol (7.4 %). The oil was active against the bacteria of Bacillus cereus, B. subtilis, and Salmonella typhimurium, except for Pseudomonas aeruginosa. The antioxidant activity has displayed a high dose–response (r2 = 0.92), with the inhibition of DPPH radical from 15 to 82 %, at concentrations from 5 to 50 μg/mL, and also by the β-carotene bleaching assay, which showed a high inhibition of 85.2 ± 6.8 %, corresponding to about 80 % of the inhibition of Trolox (93.4 ± 0.7 %), used as a standard. The lethal dose (LD50) of the oil was determined in 1673.84 mg mL−1. Conclusion The results confirmed that the oil of L. origanoides could be utilized for the prevention of food bacterial growth, and as an antioxidative agent for retardation of food oxidation process. The oil has low toxicity, allowing its application in the food industry. Aerial parts of Lippia origanoides Kunth ![]()
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Affiliation(s)
- Sandra Layse F Sarrazin
- Programa de Pós-Graduação em Biodiversidade e Biotecnologia da Amazônia Legal, Universidade Federal do Amazonas, Manaus, 60077-000, , AM, Brazil.
| | - Leomara A da Silva
- Programa de Pós-Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, Santarém, 68135-110, , PA, Brazil.
| | - Ricardo B Oliveira
- Programa de Pós-Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, Santarém, 68135-110, , PA, Brazil.
| | - Juliana Divina A Raposo
- Programa de Pós-Graduação em Química, Universidade Federal do Pará, Belém, 66075-110, , PA, Brazil.
| | - Joyce Kelly R da Silva
- Programa de Pós-Graduação em Química, Universidade Federal do Pará, Belém, 66075-110, , PA, Brazil.
| | - Fátima Regina G Salimena
- Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora, 36036-330, , MG, Brazil.
| | - José Guilherme S Maia
- Programa de Pós-Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, Santarém, 68135-110, , PA, Brazil. .,Programa de Pós-Graduação em Química, Universidade Federal do Pará, Belém, 66075-110, , PA, Brazil.
| | - Rosa Helena V Mourão
- Programa de Pós-Graduação em Biodiversidade e Biotecnologia da Amazônia Legal, Universidade Federal do Amazonas, Manaus, 60077-000, , AM, Brazil. .,Programa de Pós-Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, Santarém, 68135-110, , PA, Brazil.
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Calabresi MFF, Quini CC, Matos JF, Moretto GM, Americo MF, Graça JRV, Santos AA, Oliveira RB, Pina DR, Miranda JRA. Alternate current biosusceptometry for the assessment of gastric motility after proximal gastrectomy in rats: a feasibility study. Neurogastroenterol Motil 2015; 27:1613-20. [PMID: 26303680 DOI: 10.1111/nmo.12660] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 07/25/2015] [Indexed: 12/12/2022]
Abstract
BACKGROUND This study proposes an experimental model to assess the consequences of gastric surgeries on gastric motility. We investigated the effects of proximal gastrectomy (PG) using a non-invasive technique (alternate current biosusceptometry [ACB]) on gastric contractility (GC), gastric emptying (GE), and orocecal transit (OCT) after the ingestion of liquids and solids in rats. METHODS Twenty-four male rats were subjected to gastric motility assessment before and after the PG procedure. The GE and OCT results are expressed as the mean time of gastric emptying (MGET) and cecum arrival (MCAT). The GC recordings are presented as the frequency and amplitude of contractions. KEY RESULTS Mean time of gastric emptying after solid meals were significantly different (p < 0.001) between control and PG (113 ± 5 to 99 ± 6 min). Mean time of cecum arrival ranged from 265 ± 9 to 223 ± 11 min (p < 0.001) and 164 ± 9 to 136 ± 17 min (p < 0.050) for solid and liquid meals, respectively. The assessment of GC showed that surgery decreased the phasic frequency (4.4 ± 0.4 to 3.0 ± 1.1 cpm, p < 0.050) and increased the amplitude of contractions (3.6 ± 2.7 to 7.2 ± 3.0 V/s, p < 0.050). No significant difference was found in tonic frequency. CONCLUSIONS & INFERENCES The ACB system was able to assess GE, OCT, and GC in gastrectomized rats. Overall, PG accelerated GE and gastrointestinal transit, likely due to the increase in both intragastric pressure and amplitude contraction. Our data presented an efficient model to investigate functional consequences from gastric surgeries that will allow further studies involving different procedures.
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Affiliation(s)
- M F F Calabresi
- Departamento de Física e Biofísica, Instituto de Biociências de Botucatu, UNESP-Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | - C C Quini
- Departamento de Física e Biofísica, Instituto de Biociências de Botucatu, UNESP-Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | - J F Matos
- Departamento de Física e Biofísica, Instituto de Biociências de Botucatu, UNESP-Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | - G M Moretto
- Departamento de Física e Biofísica, Instituto de Biociências de Botucatu, UNESP-Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | - M F Americo
- Instituto de Ciências Biológicas e da Saúde, UFMT-Universidade Federal de Mato Grosso, Barra do Garças, Mato Grosso, Brazil
| | - J R V Graça
- Departamento de Fisiologia, Faculdade de Medicina de Sobral, UFC-Universidade Federal do Ceará, Sobral, Ceará, Brazil
| | - A A Santos
- Departamento de Fisiologia e Farmacologia, Faculdade de Medicina, UFC-Universidade Federal do Ceará, Fortaleza, Ceará, Brazil
| | - R B Oliveira
- Departamento de Clínica Médica, Faculdade de Medicina de Ribeirão Preto, USP-Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - D R Pina
- Departamento de Doenças Tropicais e Diagnóstico por Imagem, Faculdade de Medicina de Botucatu, UNESP - Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
| | - J R A Miranda
- Departamento de Física e Biofísica, Instituto de Biociências de Botucatu, UNESP-Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
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17
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Oliveira RB, Maschio DA, Carvalho CPF, Collares-Buzato CB. Influence of gender and time diet exposure on endocrine pancreas remodeling in response to high fat diet-induced metabolic disturbances in mice. Ann Anat 2015; 200:88-97. [PMID: 25819502 DOI: 10.1016/j.aanat.2015.01.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [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: 08/19/2014] [Revised: 01/15/2015] [Accepted: 01/26/2015] [Indexed: 10/23/2022]
Abstract
In this study, we investigated a possible sexual dimorphism regarding metabolic response and structural and functional adaptations of the endocrine pancreas after exposure to a high-fat diet (HFd). On chow diet, male and female C57BL/6/JUnib mice showed similar metabolic and morphometric parameters, except that female islets displayed a relatively lower β-cell:non-β-cell ratio. After 30 days on HFd, both male and female mice showed increased weight gain, however only the males displayed glucose intolerance associated with high postprandial glycemia when compared to their controls. After 60 days on HFd, both genders became obese, hyperglycemic, hyperinsulinemic, insulin resistant and glucose intolerant, although the metabolic changes were more pronounced in males, while females displayed greater weight gain. In both genders, insulin resistance induced by HFd feeding was compensated by expansion of β-cell mass without changes in islet cytoarchitecture. Interestingly, we found a strong correlation between the degree of β-cell expansion and the levels of hyperglycemia in the fed state: male mice fed a 60d-HFd, showing higher glycemic levels also displayed a greater β-cell mass increase in comparison with female mice. Additionally, sexual dimorphism was also observed regarding the source of β-cell mass expansion following 60d-HFd: while in males, both hypertrophy and hyperplasia (revealed by morphometry and Ki67 immunoreaction) of β-cells were observed, female islets displayed only a significant increase in β-cell size. In conclusion, this study describes gender differences in metabolic response to high fat diet, paralleled by distinct compensatory morphometric changes in pancreatic islets.
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Affiliation(s)
- R B Oliveira
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - D A Maschio
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - C P F Carvalho
- Department of Biosciences, Federal University of São Paulo, Santos, SP, Brazil
| | - C B Collares-Buzato
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP, Brazil.
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Sarrazin SLF, da Silva LA, de Assunção APF, Oliveira RB, Calao VYP, da Silva R, Stashenko EE, Maia JGS, Mourão RHV. Antimicrobial and seasonal evaluation of the carvacrol-chemotype oil from Lippia origanoides kunth. Molecules 2015; 20:1860-71. [PMID: 25625681 PMCID: PMC6272275 DOI: 10.3390/molecules20021860] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 01/14/2015] [Indexed: 11/16/2022] Open
Abstract
This study evaluated the influence of seasonal variation on the yield and composition of essential oil of Lippia origanoides occurring in the Middle Rio Amazonas, Brazil, and the impact on its antimicrobial potential. The average oil yield was 1.7% ± 0.2% in the rainy season and 1.6% ± 0.3% in the dry season. Some correlations with climatic parameters were observed. The major components were carvacrol (rainy, 43.5% ± 1.9%; dry, 41.4% ± 2.04%), thymol (rainy, 10.7% ± 1.1%; dry, 10.6% ± 0.9%), p-cymene (rainy, 9.8% ± 0.7%; dry, 10.0% ± 1.4%) and p-methoxythymol (rainy, 9.6% ± 0.8%; dry, 10.4% ± 1.4%). It was found that the antibacterial activity of L. origanoides against Staphylococcus aureus and Escherichia coli was little influenced by the changes in oil composition due to seasonal variation. Against S. aureus, the oil Minimum Inhibitory Concentration (MIC) value was 1.25 μL/mL over ten months. Against E. coli, the oil MIC values ranged from 0.15 μL/mL to 0.31 μL/mL in different months of the year. The Minimum Bactericidal Concentration (MBC) value was 2.5 μL/mL against S. aureus and 1.25 μL/mL against E. coli. The results suggest that the antimicrobial activity identified in the oil remain unchanged for the full year, allowing its medicinal use without any risk of loss or absence of the active principles of the plant.
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Affiliation(s)
- Sandra Layse F Sarrazin
- Programa de Pós-Graduação em Biodiversidade e Biotecnologia da Amazônia Legal, Universidade Federal do Amazonas, 60077-000 Manaus, Brazil.
| | - Leomara Andrade da Silva
- Programa de Pós-Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, 68135-110 Santarém, Brazil.
| | - Ana Paula F de Assunção
- Programa de Pós-Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, 68135-110 Santarém, Brazil.
| | - Ricardo B Oliveira
- Programa de Pós-Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, 68135-110 Santarém, Brazil.
| | - Victor Y P Calao
- Programa de Pós-Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, 68135-110 Santarém, Brazil.
| | - Rodrigo da Silva
- Programa de Pós-Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, 68135-110 Santarém, Brazil.
| | - Elena E Stashenko
- Chromatography Laboratory, Research Center for Biomolecules, Industrial University of Santander, Bucaramanga 57, Colombia.
| | - José Guilherme S Maia
- Programa de Pós-Graduação em Recursos Naturais da Amazônia, Universidade Federal do Oeste do Pará, 68135-110 Santarém, Brazil.
| | - Rosa Helena V Mourão
- Programa de Pós-Graduação em Biodiversidade e Biotecnologia da Amazônia Legal, Universidade Federal do Amazonas, 60077-000 Manaus, Brazil.
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Teixeira MDCB, Américo MF, Oliveira RB, Miranda JRA, Romeiro FG, Corá LA. Influence of post-transplant immunosuppressive therapy on gastrointestinal transit using biomagnetic method: a pilot study. Dig Dis Sci 2015; 60:174-80. [PMID: 25146844 DOI: 10.1007/s10620-014-3335-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 08/12/2014] [Indexed: 12/28/2022]
Abstract
BACKGROUND Immunosuppressive therapy after kidney transplant is necessary to prevent allograft rejection and it is the cause of several gastrointestinal (GI) disorders that have been scantily studied. OBJECTIVES This study was aimed at investigating the influence of triple immunosuppressive therapy on GI transit in renal transplant patients by employing a biomagnetic technique. METHODS Twenty-one renal transplant patients underwent triple therapy, which included either tacrolimus (TAC) or cyclosporin A (CsA) associated with prednisone and azathioprine. They were all evaluated, and fifteen other healthy individuals formed the control group. After a standardized meal, GI transit of magnetic markers was assessed using Alternating Current Biosusceptometry (ACB). RESULTS Patients taking TAC had significantly accelerated gastric emptying and colonic arrival (p ≤ 0.001) when compared with those taking CsA and those in the control group. However, no differences were observed in small bowel transit among the groups studied. Overall, the inter-subject coefficients of variation for gastrointestinal transit parameters were higher for the TAC group and similar for the CsA and control groups. CONCLUSION This study demonstrated that ACB is a suitable methodology when evaluating the influence of different immunosuppressive therapies on gastrointestinal transit after renal transplantation. Pronounced inter-individual variation was found in patients treated with tacrolimus, thus showing the prokinetic effect of this drug on GI motility. Studies of motility patterns in this population could be useful as complementary information toward determining the mechanisms and the relationship between motility and therapeutic doses.
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Affiliation(s)
- Maria do Carmo B Teixeira
- Centro de Ciências da Saúde, Universidade Estadual de Ciências da Saúde de Alagoas - UNCISAL, Dr Jorge Lima, 113, 57010-382, Maceió, AL, Brazil,
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20
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Sakamoto M, Chan HM, Domingo JL, Oliveira RB, Kawakami S, Murata K. Significance of fingernail and toenail mercury concentrations as biomarkers for prenatal methylmercury exposure in relation to segmental hair mercury concentrations. Environ Res 2015; 136:289-94. [PMID: 25460648 DOI: 10.1016/j.envres.2014.09.034] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [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: 08/01/2014] [Revised: 09/16/2014] [Accepted: 09/18/2014] [Indexed: 05/26/2023]
Abstract
OBJECTIVE To investigate the appropriateness of mercury (Hg) concentrations in fingernails and toenails at parturition for detecting prenatal exposure to methylmercury (MeHg). METHODS Total Hg concentrations were measured in 54 paired samples of fingernails, toenails, maternal blood, and maternal hair (1cm incremental segments from the scalp toward the tip) collected at 4th weeks of (early) pregnancy, and the same specimens and cord blood collected at parturition. RESULTS Strong correlations were observed between Hg concentrations in fingernails and toenails at early pregnancy (r=0.923, p<0.01) and at parturition (r=0.895, p<0.01). At early pregnancy, Hg concentrations in fingernails and toenails showed the strongest correlations with those in hair 3-4 cm from the scalp (r=0.818 and r=0.747, p<0.01, respectively) among the 1cm incremental hair segments. Mercury concentrations in fingernails and toenails at parturition represented strong correlations with those in cord blood (r=0.803, p<0.01 for fingernails and r=0.792, p<0.01 for toenails, respectively). At parturition, Hg concentrations in fingernails had the highest correlation with those in hair 0-1cm from the scalp (r=0.918, p<0.01), and Hg concentrations in toenails showed the highest correlation with those in hair at 2-3 cm from the scalp (r=0.872, p<0.01). In addition, Hg concentrations in both finger and toe nails at parturition had equally high (p<0.01) correlation coefficients with hair segments at 0-1, 1-2, and 2-3 cm from the scalp. CONCLUSIONS Mercury in fingernails and toenails at early pregnancy reflected the maternal Hg body burden level approximately 5 months retroactively. At parturition, Hg levels in fingernails and toenails also showed strong correlations with those in cord blood. In addition, Hg levels in fingernails and toenails at parturition reflected more recent MeHg exposure, compared with those at early pregnancy. These results suggest that fingernails and toenails at parturition are useful biomarkers for prenatal MeHg exposure for mothers and fetuses, especially during the third-trimester of gestation.
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Affiliation(s)
- Mineshi Sakamoto
- Department of Environmental Sciences and Epidemiology, National Institute for Minamata Disease, Minamata, Japan.
| | - Hing M Chan
- Center for Advanced Research in Environmental Genomics, Department of Biology, University of Ottawa, Ottawa, ON, Canada
| | - José L Domingo
- Laboratory of Toxicology and Environmental Health, School of Medicine, IISPV, Universitat "Rovira i Virgili", Reus, Spain
| | - Ricardo B Oliveira
- Laboratório de Bioprospecção e Biologia Experimental, Campus Universitário de Santarém, Universidade Federal do Oeste do Pará, Santarém, Brazil
| | - Shoichi Kawakami
- Department of Obstetrics and Gynecology, Fukuda Hospital, Kumamoto, Japan
| | - Katsuyuki Murata
- Department of Environmental Health Sciences, Akita University School of Medicine, Akita, Japan
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21
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Maranhao Neto GA, Oliveira RB, Myers JN, Farinatti PTV. Prediction of peak oxygen pulse (O2Ppeak) without exercise testing in older adults. Arch Gerontol Geriatr 2014; 59:562-7. [PMID: 25085231 DOI: 10.1016/j.archger.2014.07.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 01/27/2014] [Accepted: 07/10/2014] [Indexed: 10/25/2022]
Abstract
Peak oxygen pulse has been considered a surrogate of cardiovascular function and an independent predictor of all cause mortality. However, O2P(peak) depends on maximal volitional effort which may limit its utility in older subjects. The aim of this study was to develop a model to estimate O2P(peak) without exercise in an elderly sample. This cross-sectional study enrolled 67 community-dwelling older adults (69.4±7.1 years; 41 men) for the non-exercise model development and 30 community-dwelling older adults (67.7±6.4 years; n=30; 17 men) for cross-validation. The non-exercise model was derived through hierarchical regression model and cross-validated by means of PRESS statistics and comparison against an independent sample. Classification accuracy of the model for tertiles of estimated and actual O2P(peak) was tested by gamma (γ) nonparametric correlation. The following prediction equation was generated: -3.416+0.137 × weight (kg)+1.226 × Veterans Specific Activity Questionnaire (VSAQ) (metabolic equivalents, METs)+1.987 × gender (0=women, 1=men)-2.045 × β-Blockers use (0=no, 1=yes)-0.044 × resting heart rate (HR) (R(2)=0.83; standard error of estimate (SEE)=1.68 mL beat(-1)). Correlation in cross-validation group was 0.80 (P<0.001). A high probability was observed for the model to rank the values in the same tertile in validation and cross-validation groups (γ=0.98; γ=0.92, respectively, P<0.05). In conclusion, O2P(peak) can be estimated with reasonable precision without exercise testing, providing an alternative for elder subjects not capable to perform maximal effort.
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Affiliation(s)
| | | | | | - Paulo T V Farinatti
- Salgado de Oliveira University, Niteroi, RJ, Brazil; Rio de Janeiro State University, RJ, Brazil.
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22
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Silva MTB, Palheta-Junior RC, Sousa DF, Fonseca-Magalhães PA, Okoba W, Campos CPS, Oliveira RB, Magalhães PJC, Santos AA. Sodium bicarbonate treatment prevents gastric emptying delay caused by acute exercise in awake rats. J Appl Physiol (1985) 2014; 116:1133-41. [PMID: 24557800 DOI: 10.1152/japplphysiol.01242.2013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Physical exercise, mainly after vigorous activity, may induce gastrointestinal dysmotility whose mechanisms are still unknown. We hypothesized that physical exercise and ensuing lactate-related acidemia alter gastrointestinal motor behavior. In the present study, we evaluated the effects of short-term exercise on gastric emptying rate in awake rats subjected to 15-min swimming sessions against a load equivalent to 5% of their body weight. After 0, 10, or 20 min of exercise testing, the rats were gavage fed with 1.5 ml of a liquid test meal (0.5 mg/ml of phenol red in 5% glucose solution) and euthanized 10 min postprandially to measure fractional gastric dye recovery. In addition to inducing acidemia and increasing blood lactate levels, acute exercise increased (P < 0.05) gastric retention. Such a phenomenon presented a positive correlation (P < 0.001) between blood lactate levels and fractional gastric dye recovery. Gastric retention and other acidbase-related changes were all prevented by NaHCO3 pretreatment. Additionally, exercise enhanced (P < 0.05) the marker's progression through the small intestine. In anesthetized rats, exercise increased (P < 0.05) gastric volume, measured by a balloon catheter in a barostat system. Compared with sedentary control rats, acute exercise also inhibited (P < 0.05) the contractility of gastric fundus strips in vitro. In conclusion, acute exercise delayed the gastric emptying of a liquid test meal by interfering with the acid-base balance.
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Affiliation(s)
- Moisés T B Silva
- Departamento de Fisiologia e Farmacologia, Faculdade de Medicina, Universidade Federal do Ceará, Fortaleza, Ceará, Brazil
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23
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Marques RG, Americo MF, Spadella CT, Corá LA, Oliveira RB, Miranda JRA. Different patterns between mechanical and electrical activities: an approach to investigate gastric motility in a model of long-term diabetic rats. Physiol Meas 2013; 35:69-81. [PMID: 24345922 DOI: 10.1088/0967-3334/35/1/69] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The relationship between time-courses of mechanical and electrical events in longstanding diabetes was investigated in rats. Magnetic markers and electrodes were surgically implanted in the gastric serosa of male rats. Simultaneous recordings were obtained by AC biosusceptometry, electromyography and electrogastrography one, three and six months after injections of saline (control) or alloxan (diabetic). Frequency and amplitude of contraction, abnormal rhythmic index and half-bandwidth were obtained (ANOVA P < 0.05). Antral hypomotility and gastric motility instability were observed in the signal waveform of diabetic rats at the three time points of study. The mean frequency (4.4 ± 0.4 cpm) was strictly similar, but the mechanical and electrical correlation was lowest for diabetics groups. Decreases in mechanical amplitude were observed for all diabetic groups compared with control; also the ranges of frequency were much wider in diabetes. The half-bandwidth increased since the first month in mechanical recordings and only after the third month in electrical. In diabetic animals, about 40% of gastric activity was abnormal (against 12% in control) and may reach 60% in the sixth month of mechanical recordings. The multi-instrumental approach showed a more substantial deterioration in mechanical activity and created an integrative view of gastric motility for longstanding diabetic model.
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Affiliation(s)
- Rozemeire G Marques
- Faculdade de Medicina de Botucatu, UNESP-Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
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24
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Silva NL, Oliveira RB, Fleck SJ, Leon ACMP, Farinatti P. Influence of strength training variables on strength gains in adults over 55 years-old: a meta-analysis of dose-response relationships. J Sci Med Sport 2013; 17:337-44. [PMID: 23806877 DOI: 10.1016/j.jsams.2013.05.009] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [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: 09/28/2012] [Revised: 05/12/2013] [Accepted: 05/23/2013] [Indexed: 10/26/2022]
Abstract
OBJECTIVES The importance of strength training to elderly individuals is well established. However, the dose-response relationship of the benefits of strength training in this population is unclear. The purpose of the study was to use meta-analysis to investigate the dose-response of the effects of strength training in elderly individuals. DESIGN Fifteen studies with a total of 84 effect-sizes were included. The analyses examined the dose-response relationships of the following training variables 'intensity', 'number of sets', 'weekly frequency', and 'training duration' on strength improvement. METHODS The studies selected met the following inclusion criteria: (a) randomized controlled trials; (b) trained healthy subjects of both genders; (c) trained subjects aged 55 years or older; (d) strength increases were determined pre- and post-training; (e) use of similar strength evaluation techniques (strength determined by a repetition maximum test) and training routine (dynamic concentric-eccentric knee extension exercise to train the quadriceps muscle group). The effect-sizes were calculated using fixed and random effect models with the main effects determined by meta-regression. RESULTS Many combinations of training variables resulted in strength increases. However meta-regression indicated only "training duration" had a significant dose-response relationship to strength gains (p=0.001). Over durations of 8-52 weeks, longer training durations had a greater effect on strength gains compared to shorter duration protocols. CONCLUSIONS Resistive training causes strength gains in elderly individuals, provided the training duration is sufficiently long, regardless of the combination of other training variables.
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Affiliation(s)
- Nádia L Silva
- Physical Activity and Health Promotion Laboratory, University of Rio de Janeiro State, Brazil; Physical Activity and Sports Department, Juiz de Fora Federal University, Brazil; Physical Activity Sciences Graduate Program, Universidade Salgado de Oliveira, Brazil
| | - Ricardo B Oliveira
- Physical Activity and Health Promotion Laboratory, University of Rio de Janeiro State, Brazil; Physical Activity Sciences Graduate Program, Universidade Salgado de Oliveira, Brazil
| | - Steven J Fleck
- Health, Exercise Science & Sport Management, University of Wisconsin-Parkside, USA
| | | | - Paulo Farinatti
- Physical Activity and Health Promotion Laboratory, University of Rio de Janeiro State, Brazil; Physical Activity Sciences Graduate Program, Universidade Salgado de Oliveira, Brazil.
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25
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Silva MTB, Palheta RC, Oliveira FGV, de Lima JBM, Antunes-Rodrigues J, Oliveira RB, Magalhães PJC, Santos AA. Aortocaval fistula delays gastric emptying of liquid test meal in awake rats. Am J Physiol Heart Circ Physiol 2013; 304:H1397-405. [DOI: 10.1152/ajpheart.00827.2012] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Arteriovenous anastomoses disrupt cardiovascular and renal homeostasis, eliciting hemodynamic adjustments, resetting the humoral pattern, and inducing cardiac hypertrophy. Because acute circulatory imbalance alters gut motor behavior, we studied the effects of arteriovenous fistula placement on the gastric emptying (GE) of a liquid meal in awake rats. After laparotomy, we created an aortocaval fistula (ACF) by aorta and cava wall puncture with a 21-, 23-, or 26-gauge needle. The ACF was not created in the control group, which underwent sham operation. After 12, 24, or 48 h, mean arterial pressure, heart rate, and central venous pressure were continuously recorded, and cardiac output was estimated by thermal dilution. The rats were then gavage fed a test meal (i.e., phenol red in glucose solution), and fractional dye retention was determined 10, 20, or 30 min later. The effect of prior bleeding on ACF-induced GE delay, the role of neuroautonomic pathways, and changes in plasma hormone levels (i.e., angiotensin II, arginine vasopressin, atrial natriuretic peptide, corticosterone, and oxytocin) were evaluated. When compared with the sham-operated group, ACF rats exhibited arterial hypotension, higher ( P < 0.05) heart rate, central venous pressure, and cardiac output values and increased ( P < 0.05) gastric dye retention, a phenomenon prevented by bilateral subdiaphragmatic vagotomy and hexamethonium treatment. Pirenzepine also impaired the occurrence of gastric delay in subjects with ACF. In addition to causing hyperkinetic circulation, ACF placement delayed the GE of liquid in awake rats, an effect that likely involves a parasympathetic pathway.
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Affiliation(s)
- Moisés T. B. Silva
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Raimundo C. Palheta
- School of Veterinary Medicine, Federal University of Vale do São Francisco, Petrolina, Pernambuco, Brazil; and
| | - Francisca G. V. Oliveira
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Juliana B. M. de Lima
- School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - José Antunes-Rodrigues
- School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Ricardo B. Oliveira
- School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Pedro J. C. Magalhães
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Armênio A. Santos
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
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26
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Cunha FA, Midgley AW, Montenegro R, Oliveira RB, Farinatti PTV. Metabolic equivalent concept in apparently healthy men: a re-examination of the standard oxygen uptake value of 3.5 mL·kg(-1)·min(-1.). Appl Physiol Nutr Metab 2013; 38:1115-9. [PMID: 24053518 DOI: 10.1139/apnm-2012-0492] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study compared resting oxygen uptake (V̇O2) with the standard metabolic equivalent (MET) value of 3.5 mL·kg(-1)·min(-1), tested the accuracy of a previously published prediction model for resting V̇O2, and proposed a new prediction model for a more homogeneous population. One hundred and twenty-five apparently healthy men, aged 17-38 years, visited the laboratory for the assessment of resting V̇O2. The mean resting V̇O2 of 3.21 mL·kg(-1)·min(-1) (95% confidence interval (CI), 3.13 to 3.30) was significantly lower than the standard MET value of 3.5 mL·kg(-1)·min(-1) (mean difference, 0.29; 95% CI, 0.20 to 0.37; t = 6.7; p < 0.001). The prediction model proposed by a previous study, derived from a heterogeneous sample, exhibited no predictive ability in our more homogeneous sample. However, our population-specific regression model, which included body surface area and percent body fat as predictors, demonstrated relatively poor predictive ability, with a low R(2) (0.22) and high standard error of the estimate (0.42 mL·kg(-1)·min(-1)). Pearson's correlation coefficients for body surface area and resting V̇O2, and for percent body fat and resting V̇O2, were 0.20 (p = 0.022) and -0.36 (p < 0.001), respectively. In conclusion, the standard MET value of 3.5 mL·kg(-1)·min(-1) considerably overestimates mean resting V̇O2 in a relatively large group of apparently healthy men. Our population-specific prediction model for resting V̇O2 demonstrated relatively poor accuracy, although it was considerably more accurate than the previously published model. Further research needs to be conducted to establish accurate population-specific prediction models.
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Affiliation(s)
- Felipe A Cunha
- a Medical Sciences Graduate Program, Faculty of Medical Sciences, Rio de Janeiro State University, Rio de Janeiro, Brazil
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Carvalho CPF, Oliveira RB, Britan A, Santos-Silva JC, Boschero AC, Meda P, Collares-Buzato CB. Impaired β-cell-β-cell coupling mediated by Cx36 gap junctions in prediabetic mice. Am J Physiol Endocrinol Metab 2012; 303:E144-51. [PMID: 22569071 DOI: 10.1152/ajpendo.00489.2011] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Gap junctional intercellular communication between β-cells is crucial for proper insulin biosynthesis and secretion. The aim of this work was to investigate the expression of connexin (Cx)36 at the protein level as well as the function and structure of gap junctions (GJ) made by this protein in the endocrine pancreas of prediabetic mice. C57BL/6 mice were fed a high-fat (HF) or regular chow diet for 60 days. HF-fed mice became obese and prediabetic, as shown by peripheral insulin resistance, moderate hyperglycemia, hyperinsulinemia, and compensatory increase in endocrine pancreas mass. Compared with control mice, prediabetic animals showed a significant decrease in insulin-secretory response to glucose and displayed a significant reduction in islet Cx36 protein. Ultrastructural analysis further showed that prediabetic mice had GJ plaques about one-half the size of those of the control group. Microinjection of isolated pancreatic islets with ethidium bromide revealed that prediabetic mice featured a β-cell-β-cell coupling 30% lower than that of control animals. We conclude that β-cell-β-cell coupling mediated by Cx36 made-channels is impaired in prediabetic mice, suggesting a role of Cx36-dependent cell-to-cell communication in the pathogenesis of the early β-cell dysfunctions that lead to type 2-diabetes.
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Affiliation(s)
- C P F Carvalho
- Department of Histology and Embryology, Institute of Biology, University of Campinas, Campinas, São Paulo, Brazil
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Quini CC, Américo MF, Corá LA, Calabresi MF, Alvarez M, Oliveira RB, Miranda JRA. Employment of a noninvasive magnetic method for evaluation of gastrointestinal transit in rats. J Biol Eng 2012; 6:6. [PMID: 22587220 PMCID: PMC3412735 DOI: 10.1186/1754-1611-6-6] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [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: 11/21/2011] [Accepted: 05/15/2012] [Indexed: 02/08/2023] Open
Abstract
AC Biosusceptometry (ACB) was previously employed towards recording gastrointestinal motility. Our data show a reliable and successful evaluation of gastrointestinal transit of liquid and solid meals in rats, considering the methods scarcity and number of experiments needed to endorsement of drugs and medicinal plants. ACB permits real time and simultaneous experiments using the same animal, preserving the physiological conditions employing both meals with simplicity and accuracy.
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Affiliation(s)
- Caio C Quini
- Instituto de Biociências de Botucatu, IBB - Universidade Estadual Paulista - UNESP, Distrito de Rubião Jr s/n, Botucatu, São Paulo, CEP: 18600-000, Brazil.
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29
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Andrioli WJ, Santos MS, Silva VB, Oliveira RB, Chagas-Paula DA, Jorge JA, Furtado NAJC, Pupo MT, Silva CHTP, Naal RMZG, Bastos JK. Δ-lactam derivative from thermophilic soil fungus exhibits in vitro anti-allergic activity. Nat Prod Res 2012; 26:2168-75. [PMID: 22239222 DOI: 10.1080/14786419.2011.647020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
From cultures of thermophilic soil fungus Humicola grisea var thermoidea, a δ-lactam derivative (3-(2-(4-hydroxyphenyl)-2-oxoethyl)-5,6-dihydropyridin-2(1H)-one) that displayed anti-allergic activity was isolated, which was predicted by in silico computational chemistry approaches. The in vitro anti-allergic activity was investigated by β-hexosaminidase release assay in rat basophilic leukaemia RBL-2H3 cells. The δ-lactam derivative exhibited similar anti-allergic activity (IC(50) = 18.7 ± 6.7 µM) in comparison with ketotifen fumarate (IC(50) = 15.0 ± 1.3 µM) and stronger anti-allergic activity than azelastine (IC(50) = 32.0 µM). Also, the MTT cytotoxicity assay with RBL-2H3 cells showed that δ-lactam does not display cytotoxicity at concentrations lower than 50 µM. This study suggests that the δ-lactam derivative has the potential to be used as a lead compound in the development of anti-allergic drugs for clinical use in humans.
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Affiliation(s)
- W J Andrioli
- Departamento de Ciências Farmacêuticas, Universidade de São Paulo, Avenida do Café, s/n, CEP 14040-903, Ribeirão Preto, São Paulo, Brasil
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Agostinho M, Américo MF, Marques RG, Zandoná EA, Stelzer M, Corá LA, Andreis U, Oliveira RB, Miranda JRA. AC Biosusceptometry as a method for measuring gastric contraction. Annu Int Conf IEEE Eng Med Biol Soc 2011; 2010:5740-3. [PMID: 21097331 DOI: 10.1109/iembs.2010.5627855] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The aim of this study was to validate the alternate current biosusceptometry (ACB) for monitoring gastric contractions in rats. In vitro data were obtained to establish the relationship between ACB and the strain-gauge (SG) signal amplitude. In vivo experiments were performed on rats with magnetic markers and SGs previously implanted under the gastric serosa. The effects of the prandial state in gastric motility profiles were obtained. The correlation between in vitro signal amplitudes was strong (R = 0.989). The temporal cross-correlation between the ACB and SG signal amplitude was higher in the postprandial than in the fasting state. Irregular signal profiles, low contraction amplitudes, and smaller signal-to-noise ratios explained the poor correlation for fasting-state recordings. The contraction frequencies using ACB were 0.068 ± 0.007 Hz (postprandial) and 0.058 ± 0.007 Hz (fasting) and those using SG were 0.066 ± 0.006 Hz (postprandial) and 0.059 ± 0.008 Hz (fasting) (P < 0.003). When a magnetic tracer was ingested, there was a strong correlation and a small phase-difference between techniques. We conclude that ACB provides an accurate and sensitive technique for studies of GI motility in the rat.
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Filho FLA, Macedo GM, Dos Santos AA, Rodrigues LV, Oliveira RB, Nobre E Souza MA. Stapled haemorrhoidopexy transiently decreases rectal compliance and sensitivity. Colorectal Dis 2011; 13:219-24. [PMID: 19888951 DOI: 10.1111/j.1463-1318.2009.02103.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
AIM Stapled haemorrhoidopexy may damage the anorectal musculature and its sensorimotor function. Most studies have not used a barostat for the measurement of compliance. This study aimed to investigate the effect of stapled haemorrhoidopexy on rectal compliance and sensitivity. METHOD After Ethical Committee approval, we studied 10 male patients (mean age 33.8 years) with third- or fourth-degree haemorrhoids. Rectal compliance and sensitivity were measured with a 600-ml bag and an electronic barostat. Volunteers were submitted to two consecutive rectal distension protocols, including continuous distension at 2, 4 and 6 months after stapled haemorrhoidopexy. Intraluminal volume and pressure were recorded, including the first rectal sensation, desire to defecate and onset of rectal pain. Another group of 10 male control patients (mean age 24.9 years) with pilonidal sinus and no haemorrhoids was also included in the study. RESULTS Two months after stapled haemorrhoidopexy, rectal compliance decreased (7.1 ± 0.2 vs 5.3 ± 0.1, 6.4 ± 0.1 vs 5.1 ± 0.1 and 5.6 ± 0.2 vs 4.7 ± 0.1 ml/mmHg for first rectal sensation, desire to defecate and rectal pain, respectively; P < 0.05). The sensitivity threshold volume did not change for the first sensation but decreased significantly for the desier to defecate and pain (p <0.05) (116.8 ± 13.8 vs 148.4 ± 14.61, 251.1 ± 8.9 vs 185.8 ± 8.6 and 293.3 ± 16.6 vs 221.2 ± 6.0 ml for first rectal sensation, desire to defecate and rectal pain, respectively). Four and 6 months after surgery, rectal compliance and sensitivity returned to levels similar to those in the basal period. Muscle tissue was found in only three of the 10 resected doughnuts. Controls remained without any change in rectal compliance and sensitivity. CONCLUSION Stapled haemorrhoidopexy transiently decreases rectal compliance and sensitivity threshold in young male patients.
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Affiliation(s)
- F L A Filho
- Departments of Surgery Physiology and Pharmacology and Clinical Medicine, School of Medicine, Federal University of Ceará, Fortaleza, Brazil
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Américo MF, Ietsugu MV, Romeiro FG, Corá LA, Oliveira RB, Miranda JRA. Effects of meal size and proximal-distal segmentation on gastric activity. World J Gastroenterol 2010; 16:5861-8. [PMID: 21155008 PMCID: PMC3001978 DOI: 10.3748/wjg.v16.i46.5861] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To evaluate the effects of meal size and three segmentations on intragastric distribution of the meal and gastric motility, by scintigraphy.
METHODS: Twelve healthy volunteers were randomly assessed, twice, by scintigraphy. The test meal consisted of 60 or 180 mL of yogurt labeled with 64 MBq 99mTc-tin colloid. Anterior and posterior dynamic frames were simultaneously acquired for 18 min and all data were analyzed in MatLab. Three proximal-distal segmentations using regions of interest were adopted for both meals.
RESULTS: Intragastric distribution of the meal between the proximal and distal compartments was strongly influenced by the way in which the stomach was divided, showing greater proximal retention after the 180 mL. An important finding was that both dominant frequencies (1 and 3 cpm) were simultaneously recorded in the proximal and distal stomach; however, the power ratio of those dominant frequencies varied in agreement with the segmentation adopted and was independent of the meal size.
CONCLUSION: It was possible to simultaneously evaluate the static intragastric distribution and phasic contractility from the same recording using our scintigraphic approach.
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Américo MF, Marques RG, Zandoná EA, Andreis U, Stelzer M, Corá LA, Oliveira RB, Miranda JRA. Validation of ACB in vitro and in vivo as a biomagnetic method for measuring stomach contraction. Neurogastroenterol Motil 2010; 22:1340-4, e374. [PMID: 20874731 DOI: 10.1111/j.1365-2982.2010.01582.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND The aim of this study was to validate a biomagnetic method (alternate current biosusceptometry, ACB) for monitoring gastric wall contractions in rats. METHODS In vitro data were obtained to establish the relationship between ACB and the strain-gauge (SG) signal amplitude. In vivo experiments were performed in pentobarbital-anesthetized rats with SG and magnetic markers previously implanted under the gastric serosa or after ingestion of magnetic material. Gastric motility was quantified from the tracing amplitudes and frequency profiles obtained by Fast Fourier Transform. KEY RESULTS The correlation between in vitro signal amplitudes was strong (R = 0.989). The temporal cross-correlation coefficient between the ACB and SG signal amplitude was higher (P < 0.0001) in the postprandial (88.3 ± 9.1 V) than in the fasting state (31.0 ± 16.9 V). Irregular signal profiles, low contraction amplitudes, and smaller signal-to-noise ratios explained the poor correlation between techniques for fasting-state recordings. When a magnetic material was ingested, there was also strong correlation in the frequency and signal amplitude and a small phase-difference between the techniques. The contraction frequencies using ACB were 0.068 ± 0.007 Hz (postprandial) and 0.058 ± 0.007 Hz (fasting) (P < 0.002) and those using SG were 0.066 ± 0.006 Hz (postprandial) and 0.059 ± 0.008 Hz (fasting) (P < 0.005). CONCLUSIONS & INFERENCES In summary, ACB is reliable for monitoring gastric wall contractions using both implanted and ingested magnetic materials, and may serve as an accurate and sensitive technique for gastrointestinal motility studies.
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Affiliation(s)
- M F Américo
- Departamento de Física e Biofísica, Instituto de Biociências, UNESP – Univ Estadual Paulista, Botucatu, São Paulo, Brazil.
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Corá LA, Américo MF, Oliveira RB, Serra CHR, Baffa O, Evangelista RC, Oliveira GF, Miranda JRA. Biomagnetic Methods: Technologies Applied to Pharmaceutical Research. Pharm Res 2010; 28:438-55. [DOI: 10.1007/s11095-010-0285-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Accepted: 09/14/2010] [Indexed: 02/06/2023]
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Rosa-E-Silva L, Troncon LEA, Gallo L, Foss MC, Passos ADC, Perdoná GC, Achcar JA, Oliveira RB. Determinants of accelerated small intestinal transit in alcohol-related chronic pancreatitis. Dig Dis Sci 2010; 55:1017-25. [PMID: 19390966 DOI: 10.1007/s10620-009-0802-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2008] [Accepted: 03/17/2009] [Indexed: 02/02/2023]
Abstract
Patients with chronic pancreatitis may have abnormal gastrointestinal transit, but the factors underlying these abnormalities are poorly understood. Gastrointestinal transit was assessed, in 40 male outpatients with alcohol-related chronic pancreatitis and 18 controls, by scintigraphy after a liquid meal labeled with (99m)technetium-phytate. Blood and urinary glucose, fecal fat excretion, nutritional status, and cardiovascular autonomic function were determined in all patients. The influence of diabetes mellitus, malabsorption, malnutrition, and autonomic neuropathy on abnormal gastrointestinal transit was assessed by univariate analysis and Bayesian multiple regression analysis. Accelerated gastrointestinal transit was found in 11 patients who showed abnormally rapid arrival of the meal marker to the cecum. Univariate and Bayesian analysis showed that diabetes mellitus and autonomic neuropathy had significant influences on rapid transit, which was not associated with either malabsorption or malnutrition. In conclusion, rapid gastrointestinal transit in patients with alcohol-related chronic pancreatitis is related to diabetes mellitus and autonomic neuropathy.
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Abstract
OBJECTIVE To evaluate the influence of cardiorespiratory fitness (fitness) on the obesity paradox in middle-aged men with known or suspected coronary artery disease. PATIENTS AND METHODS This study consists of 12,417 men aged 40 to 70 years (44% African American) who were referred for exercise testing at the Veterans Affairs Medical Centers in Washington, DC, or Palo Alto, CA (between January 1, 1983, and June 30, 2007). Fitness was quantified as metabolic equivalents achieved during a maximal exercise test and was categorized for analysis as low, moderate, and high (defined as <5, 5-10, and >10 metabolic equivalents, respectively). Adiposity was defined by body mass index (BMI) according to standard clinical guidelines. Separate and combined associations of fitness and adiposity with all-cause mortality were assessed by Cox proportional hazards analyses. RESULTS We recorded 2801 deaths during a mean+/-SD follow-up of 7.7+/-5.3 years. Multivariate hazard ratios (95% confidence interval) for all-cause mortality, with normal weight (BMI, 18.5-24.9 kg/m2) used as the reference group, were 1.9 (1.5-2.3), 0.7 (0.7-0.8), 0.7 (0.6-0.7), and 1.0 (0.8-1.1) for BMIs of less than 18.5, 25.0 to 29.9, 30.0 to 34.9, and 35.0 or more kg/m2, respectively. Compared with highly fit normal-weight men, underweight men with low fitness had the highest (4.5 [3.1-6.6]) and highly fit overweight men the lowest (0.4 [0.3-0.6]) mortality risk of any subgroup. Overweight and obese men with moderate fitness had mortality rates similar to those of the highly fit normal-weight reference group. CONCLUSION Fitness altered the obesity paradox. Overweight and obese men had increased longevity only if they registered high fitness.
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Affiliation(s)
- Paul A McAuley
- Department of Human Performance and Sport Sciences, Winston-Salem State University, 601 S Martin Luther King Jr Dr, Anderson C 24-E, Winston-Salem, NC 27110, USA.
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Américo MF, Oliveira RB, Corá LA, Marques RG, Romeiro FG, Andreis U, Miranda JRA. The ACB technique: a biomagentic tool for monitoring gastrointestinal contraction directly from smooth muscle in dogs. Physiol Meas 2009; 31:159-69. [DOI: 10.1088/0967-3334/31/2/003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Mandic S, Myers J, Oliveira RB, Abella J, Froelicher VF. Characterizing differences in mortality at the low end of the fitness spectrum in individuals with cardiovascular disease. ACTA ACUST UNITED AC 2009; 17:289-95. [DOI: 10.1097/hjr.0b013e32833163e2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Sandra Mandic
- Veterans Affairs Palo Alto Health Care System
- Stanford School of Medicine, Palo Alto, California, USA
- School of Physical Education, University of Otago, Dunedin, New Zealand
| | - Jonathan Myers
- Veterans Affairs Palo Alto Health Care System
- Stanford School of Medicine, Palo Alto, California, USA
| | - Ricardo B. Oliveira
- Veterans Affairs Palo Alto Health Care System
- Stanford School of Medicine, Palo Alto, California, USA
| | | | - Victor F. Froelicher
- Veterans Affairs Palo Alto Health Care System
- Stanford School of Medicine, Palo Alto, California, USA
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McAuley P, Myers J, Emerson B, Oliveira RB, Blue CL, Pittsley J, Froelicher VF. Cardiorespiratory fitness and mortality in diabetic men with and without cardiovascular disease. Diabetes Res Clin Pract 2009; 85:e30-3. [PMID: 19524317 DOI: 10.1016/j.diabres.2009.05.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2009] [Revised: 04/24/2009] [Accepted: 05/18/2009] [Indexed: 11/29/2022]
Abstract
We assessed joint associations of cardiorespiratory fitness and diabetes, cardiovascular disease (CVD), or both with all-cause mortality. High-fitness eliminated mortality risk in diabetes (P<0.001) and halved risk of death in diabetes/CVD (P<0.001). Fitness was a potent effect modifier in the association of diabetes and CVD to mortality.
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Affiliation(s)
- Paul McAuley
- Department of Human Performance and Sport Sciences, Winston-Salem State-University, Winston-Salem, NC 27110, USA.
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Myers J, Arena R, Oliveira RB, Bensimhon D, Hsu L, Chase P, Guazzi M, Brubaker P, Moore B, Kitzman D, Peberdy MA. The lowest VE/VCO2 ratio during exercise as a predictor of outcomes in patients with heart failure. J Card Fail 2009; 15:756-62. [PMID: 19879461 DOI: 10.1016/j.cardfail.2009.05.012] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2008] [Revised: 05/15/2009] [Accepted: 05/21/2009] [Indexed: 11/27/2022]
Abstract
BACKGROUND The lowest minute ventilation (VE) and carbon dioxide production (VCO(2)) ratio during exercise has been suggested to be the most stable and reproducible marker of ventilatory efficiency in patients with heart failure (HF). However, the prognostic power of this index is unknown. METHODS AND RESULTS A total of 847 HF patients underwent cardiopulmonary exercise testing (CPX) and were followed for 3 years. The associations between the lowest VE/VCO(2) ratio, maximal oxygen uptake (peak VO(2)), the VE/VCO(2) slope, and major events (death or transplantation) were evaluated using proportional hazards analysis; adequacy of the predictive models was assessed using Akaike information criterion (AIC) weights. There were 147 major adverse events. In multivariate analysis, the lowest VE/VCO(2) ratio (higher ratio associated with greater risk) was similar to the VE/VCO(2) slope in predicting risk (hazard ratios [HR] per unit increment 2.0, 95% CI 1.1-3.4, and 2.2, 95% CI 1.3-3.7, respectively; P < .01), followed by peak VO(2) (HR 1.6, 95% CI 1.1-2.4, P=.01). Patients exhibiting abnormalities for all 3 responses had an 11.6-fold higher risk. The AIC weight for the 3 variables combined (0.94) was higher than any single response or any combination of 2. The model including all 3 responses remained the most powerful after adjustment for beta-blocker use, type of HF, and after applying different cut points for high risk. CONCLUSIONS The lowest VE/VCO(2) ratio adds to the prognostic power of conventional CPX responses in HF.
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Affiliation(s)
- Jonathan Myers
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA 94304, USA.
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Cristino-Filho G, Leal PRL, Lira GHS, Souza SG, Rola FH, Oliveira RB, Souza MAN, Santos AA. Acute intracranial hypertension increases gastric tonus in anesthetized rats. Auton Neurosci 2009; 146:95-101. [PMID: 19181574 DOI: 10.1016/j.autneu.2008.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2008] [Revised: 12/17/2008] [Accepted: 12/18/2008] [Indexed: 11/25/2022]
Abstract
We studied the acute effect of intracranial hypertension (ICH) on gastric tonus of anesthetized rats. Brain ventricles were cannulated bilaterally for intracerebro-ventricular pressure (ICP) monitoring and ICH induction. Next, a balloon catheter was inserted at the proximal stomach and coupled to a barostat for gastric volume (GV) monitoring by plethysmography. Arterial pressure (AP) and heart rate (HR) were monitored continuously during 80-min. After a 20-min basal period, they were submitted to control or ICH protocols. In controls, the ICP varied spontaneously up to the end. Other rats were subjected to ICP rising to 10, 20, 40 or 60 mmHg and kept at these levels for 30-min. Another group was subjected after basal period to stepwise ICH (ICP rising to 20, 40 and 60 mmHg at every 10-min interval). Next, the ICH rats were monitored for further 30-min. Other rats, previously submitted to a subdiaphragmatic vagotomy, splanchnicectomy plus ganglionectomy or their respective sham surgery, were also studied under ICH. Each subset consisted of 5-6 rats. Data were compared to respective basal values after ANOVA and Bonferroni's test. In controls, the GV, AP, HR values remained within stable levels. Besides inducing bradycardia and arterial hypertension, ICH10 mmHg decreased GV by 14.8% at the 50-min interval. In ICH20, 40 and 60 mmHg subsets, GV decreased 14.0, 24.5 and 30.6% at the 40-min interval, respectively. In stepwise ICH rats, GV decreased 10.2% and 12.7%, respectively under ICP of 40 and 60 mmHg. The GV values remained significantly lower than basal levels during the last 30-min of monitoring. Thus, ICH decreases the GV in an ICP-dependent pattern besides inducing Cushing's reflex.
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Affiliation(s)
- G Cristino-Filho
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Brazil
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Abstract
It is well-established that at old age there is a significant decline in muscle strength. Reference values for muscle strength might be useful for assessment of muscle impairment and of physiological adaptations. However, it is still unclear whether gender affects the rate of decline. Therefore, the aim of this study is to investigate the effect of gender and age on handgrip strength and to establish reference values for this variable. Reviewing medical charts collected from 1994 to 2005, a convenience sample of 2,648 subjects (1,787 men and 861 women), aged between 18 and 90 years, was obtained. Our results show higher handgrip strength for men compared with women (36.8 +/- 0.20 vs. 21.0 +/- 0.18 kg; p < 0.001). The regression analysis with a quadratic model shows that aging accounts for 30% of the variance in handgrip strength (r(2) = 0.30; p < 0.001) in men and 28% (r(2) = 0.28; p < 0.001) in women. In addition, the bent linear regression with multiple regressors show that a faster decline in handgrip strength occurs at the age of 30 years for men and 50 years for women. We conclude that handgrip strength decline with age differs between genders, making useful the existence of distinct male and female normative age group data.
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Affiliation(s)
- Lauro C Vianna
- Physical Education Graduate Program, Gama Filho University, Rio de Janeiro, Brazil
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Andreis U, Américo MF, Corá LA, Oliveira RB, Baffa O, Miranda JRA. Gastric motility evaluated by electrogastrography and alternating current biosusceptometry in dogs. Physiol Meas 2008; 29:1023-31. [PMID: 18698113 DOI: 10.1088/0967-3334/29/9/002] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Association techniques could be the answer for evaluating electromechanical coupling and gastric emptying under basal conditions and after administration of drugs. Electrogastrography (EGG) and alternating current biosusceptometry (ACB) emerged due to their interesting nature, noninvasiveness and low cost. The aims were to examine in dogs the effect of erythromycin on gastric emptying by ACB and electrical and motor responses to erythromycin and propranolol by ACB and EGG respectively. Twelve beagle dogs ingested a solid test meal on separate days. Under anesthesia, gastric motility was evaluated by EGG and ACB after erythromycin and propranolol administration. Without anesthesia, gastric emptying was assessed under basal conditions and after erythromycin by ACB. ACB and EGG showed a strong temporal correlation. Erythromycin and propranolol presented the same profile with different power ratios; the amplitude increased whereas frequency decreased. Also, erythromycin administration hastened gastric emptying while reducing the orocaecal transit time. There is a demand for reliable, easy-to-perform and comfortable techniques to record gastric emptying and gastric activity in medicine and veterinary practice. In summary, the association of ACB with EGG accompanied by an appropriate animal model is promising for evaluating effects of drugs in gastric myoelectrical and contractile activity.
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Affiliation(s)
- Uilian Andreis
- Departamento de Física e Biofísica, IBB, São Paulo State University-UNESP, Botucatu, São Paulo, Brazil
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Corá LA, Fonseca PR, Américo MF, Oliveira RB, Baffa O, Miranda JRA. Influence of compression forces on tablets disintegration by AC Biosusceptometry. Eur J Pharm Biopharm 2008; 69:372-9. [DOI: 10.1016/j.ejpb.2007.11.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2007] [Revised: 11/08/2007] [Accepted: 11/12/2007] [Indexed: 10/22/2022]
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Souza MHLP, Mota JMSC, Oliveira RB, Cunha FQ. Gastric damage induced by different doses of indomethacin in rats is variably affected by inhibiting iNOS or leukocyte infiltration. Inflamm Res 2008; 57:28-33. [PMID: 18209962 DOI: 10.1007/s00011-007-7089-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
AIM To evaluate the effect of inhibiting inducible nitric oxide synthase (iNOS), by aminoguanidine, or leukocyte infiltration, by fucoidin, on gastropathy induced by two different doses of indomethacin in rats. METHODS Rats were treated with saline, aminoguanidine (50 or 100 mg.kg(-1), i. p.) or fucoidin (25 mg.kg(-1), i. v.). Indomethacin was then given at a dose of 5 or 20 mg.kg(-1). At the end of 3 h, macroscopic gastric damage and myeloperoxidase (MPO) activity were assessed. RESULTS Aminoguanidine reduced the gastric damage induced by indomethacin at 20 mg.kg(-1), but increased gastric MPO activity. However, aminoguanidine did not influence the gastric damage induced by indomethacin at 5 mg.kg(-1). Fucoidin prevented both the gastric damage and the increase in gastric MPO activity induced by indomethacin at 20 mg. kg(-1), but not at 5 mg.kg(-1). CONCLUSION Indomethacin at a dose of 20 mg.kg(-1), but not at 5 mg.kg(-1), induced gastropathy dependent on neutrophil infiltration and iNOS-generated NO.
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Affiliation(s)
- M H L P Souza
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Ceará, Brazil.
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Paixão FC, de Moraes R, Stelzer M, Corá LA, Américo MF, Andreis U, Oliveira RB, Baffa O, de A Miranda JR. A novel biomagnetic instrumentation with four magnetoresistive sensors to evaluate gastric motility. Annu Int Conf IEEE Eng Med Biol Soc 2008; 2007:2215-8. [PMID: 18002430 DOI: 10.1109/iembs.2007.4352764] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A novel instrumentation using anisotropic magnetoresistive (AMR) sensors associated with magnetic coils excitation was developed to evaluate gastrointestinal tract motility parameters. The susceptometer has four sensors that were used to measure the gastric activity contractions (GAC) in anaesthetized dogs, its performance was evaluated by manometry with good results.
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Affiliation(s)
- Fabiano C Paixão
- Departamento de Física e Biofísica, IBB - Universidade Estadual Paulista, Distrito de Rubião Júnior, S/N, 18.618-000, Botucatu-SP, Brazil
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Soares PMG, Mota JMSC, Gomes AS, Oliveira RB, Assreuy AMS, Brito GAC, Santos AA, Ribeiro RA, Souza MHLP. Gastrointestinal dysmotility in 5-fluorouracil-induced intestinal mucositis outlasts inflammatory process resolution. Cancer Chemother Pharmacol 2008; 63:91-8. [PMID: 18324404 DOI: 10.1007/s00280-008-0715-9] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2007] [Accepted: 02/17/2008] [Indexed: 12/22/2022]
Abstract
AIM To evaluate gastrointestinal motility during 5-fluorouracil (5-FU)-induced intestinal mucositis. MATERIALS AND METHODS Wistar rats received 5-FU (150 mg kg(-1), i.p.) or saline. After the 1st, 3rd, 5th, 15th and 30th day, sections of duodenum, jejunum and ileum were removed for assessment of epithelial damage, apoptotic and mitotic indexes, MPO activity and GSH concentration. In order to study gastrointestinal motility, on the 3rd or 15th day after 5-FU treatment, gastric emptying in vivo was measured by scintilographic method, and stomach or duodenal smooth muscle contractions induced by CCh were evaluated in vitro. RESULTS On the third day of treatment, 5-FU induced a significant villi shortening, an increase in crypt depth and intestinal MPO activity and a decrease in villus/crypt ratio and GSH concentration. On the first day after 5-FU there was an increase in the apoptosis index and a decrease in the mitosis index in all intestinal segments. After the 15th day of 5-FU treatment, a complete reversion of all these parameters was observed. There was a delay in gastric emptying in vivo and a significant increase in gastric fundus and duodenum smooth muscle contraction, after both the 3rd and 15th day. CONCLUSION 5-FU-induced gastrointestinal dysmotility outlasts intestinal mucositis.
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Affiliation(s)
- Pedro M G Soares
- Centro de Biomedicina, Faculdade de Medicina, Universidade Federal do Ceará, Rodolfo Teófilo, Fortaleza, Brazil
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Vianna LC, Oliveira RB, Silva BM, Ricardo DR, Araújo CGS. Water intake accelerates post-exercise cardiac vagal reactivation in humans. Eur J Appl Physiol 2007; 102:283-8. [PMID: 17929050 DOI: 10.1007/s00421-007-0584-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/21/2007] [Indexed: 11/28/2022]
Abstract
Post-exercise cardiac vagal reactivation is well-investigated; however, the effect of water intake during this period has not been well studied. Therefore, our aim was to assess the influence of water intake on the cardiac vagal reactivation after 30 min of a submaximal cycling exercise. Ten healthy subjects (eight men) aged 23-35 years were evaluated. A 3-day testing cycle duration, subjects were randomly chosen to drink either 500 ml (experimental visit) or 50 ml (control visit) of water immediately after the 30-min cycling exercise at a workload representing 80% of a previously measured anaerobic threshold. A cardiac vagal index (CVI) was obtained using the 4-s exercise test measured before and after (10 and 30 min) exercise at each testing day. Data analysis (2 x 3 ANOVA for repeated measures) showed higher cardiac vagal activity at the 30-min post-exercise period when 500 ml of water was ingested. CVI values for the 500 and 50 ml trials were 1.55 +/- 0.04 vs. 1.49 +/- 0.04, P = 0.003 (mean +/- SEM), respectively. Heart rate and blood pressure values were relatively the same. In conclusion, water intake of about 500 ml immediately after 30 min of cycling exercise accelerates post-exercise cardiac vagal reactivation. These results suggest that post-exercise hydration might be beneficial not only for thermoregulation, but also for vagal reactivation.
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Affiliation(s)
- Lauro C Vianna
- Programa de Pós-Graduação em Educação Física da Universidade Gama Filho, Rio de Janeiro, RJ, Brazil
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Américo MF, Oliveira RB, Romeiro FG, Baffa O, Corá LA, Miranda JRA. Scintigraphic validation of AC Biosusceptometry to study the gastric motor activity and the intragastric distribution of food in humans. Neurogastroenterol Motil 2007; 19:804-11. [PMID: 17883432 DOI: 10.1111/j.1365-2982.2007.00960.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Abnormal intragastric distribution of food (IDF) and a phasic contractility in the proximal stomach have been related to dyspeptic symptoms. Thus, the behaviour of the stomach and the proximal region, in particular, continues to attract attention and demand for reliable and comfortable techniques. The aims of this study were to employ AC Biosusceptometry (ACB) and scintigraphy to evaluate IDF and gastric motor activity in humans. Fifteen healthy volunteers ingested 60 mL of yogurt containing 2 mCi of 99mTc and 4 g of ferrite. Each volunteer had gastric motility and IDF evaluated twice on separate days; on one occasion by ACB and another by scintigraphy. Digital signal processing was performed in MatLab (Mathworks Inc., Natick, MA, USA). Results were expressed as mean +/- SD. Similar results of distal accumulation time (P < 0.001) were obtained for scintigraphy (6.93 +/- 3.25 min) and for ACB (7.04 +/- 3.65 min). Fast Fourier Transform revealed two dominant frequencies (P > 0.9). Besides the well-know frequency of 3 cpm, our results showed identical frequencies in proximal stomach recordings (P < 0.001) for scintigraphic (1.01 +/- 0.01 cpm) and ACB (0.98 +/- 0.06 cpm). In summary, our data showed that scintigraphy and ACB are promising techniques to evaluate several aspects of gastric motility. Moreover, ACB is non-invasive, radiation-free and deserves the same importance as conventional methods for this kind of analysis.
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Affiliation(s)
- M F Américo
- Departamento de Fisiologia, FMRP, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
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Vianna LC, Oliveira RB, Ricardo DR, Silva BM, Araújo CG. Intake of Water Accelerates the Cardiac Vagal Reflex Recovery After Aerobic Exercise. Med Sci Sports Exerc 2007. [DOI: 10.1249/01.mss.0000274098.23088.e8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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