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Machado MPR, Gama LA, Beckmann APS, Pinto LA, de Miranda JRDA, Marques RG, Américo MF. Gastric plication surgery changes gastrointestinal and metabolic parameters in an obesity-induced high-fat diet model. Neurogastroenterol Motil 2024; 36:e14717. [PMID: 37994287 DOI: 10.1111/nmo.14717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 09/19/2023] [Accepted: 11/14/2023] [Indexed: 11/24/2023]
Abstract
BACKGROUND Obesity treatment includes less invasive procedures such as gastric plication (GP) surgery; however, its effects on gastrointestinal (GI) motility parameters are underestimated. We aimed to verify the metabolic and gastrointestinal effects of GP surgery in the rat obesity model. METHODS A high-fat diet-induced obesity was used. Animals were allocated to four experimental groups: control sham (n = 6); control GP (n = 10); obese sham (n = 6); and obese GP (n = 10). Nutritional and murinometric parameters, gastric motility, glucose tolerance, histopathology, fat depots, leptin, and lipoproteins levels were evaluated 30 days after surgery. Data were analyzed by ANOVA followed by post Tukey or Kruskal-Wallis test followed by Dunn's multiple comparisons test. KEY RESULTS Gastric plication decreased leptin levels, feed efficiency, and body weight gain. GP does not improve lipid profile in obese animals and however, ameliorates glucose tolerance in control and obese rats. GP did not improve the gastric emptying time or normalize the frequency of contractions disturbed by obesity. Surgery provides a remodeling process in the mucosa and muscularis mucosa layers, evidenced by leukocyte infiltration mainly in the mucosa layer. CONCLUSIONS & INFERENCES Our study revealed the influence of the gastrointestinal tract on obesity is underestimated with pieces of evidence pointing out its important role as a target for surgical treatment.
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Affiliation(s)
- Mariana Pirani Rocha Machado
- São Paulo State University - UNESP, Botucatu, Brazil
- Araguaia Valley University Center (UNIVAR), Barra do Garças, Brazil
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Soares G, Pinto L, Liebl M, Biasotti G, Prospero A, Stoppa E, Bakuzis A, Baffa O, Wiekhorst F, Miranda JRA. Quantitative imaging of magnetic nanoparticles in an unshielded environment using a large AC susceptibility array. J Biol Eng 2022; 16:25. [PMID: 36221096 PMCID: PMC9552418 DOI: 10.1186/s13036-022-00305-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 09/26/2022] [Indexed: 11/29/2022] Open
Abstract
Background Non-invasive magnetic imaging techniques are necessary to assist magnetic nanoparticles in biomedical applications, mainly detecting their distribution inside the body. In Alternating Current Biosusceptometry (ACB), the magnetic nanoparticle's magnetization response under an oscillating magnetic field, which is applied through an excitation coil, is detected with a balanced detection coil system. Results We built a Multi-Channel ACB system (MC-ACB) containing nineteen pick-up coils and obtained 2D quantitative images of magnetic nanoparticle distributions by solving an inverse problem. We reconstructed the magnetic nanoparticles spatial distributions in a field of view of 14 × 14 cm2 with a spatial resolution of 2.0 cm and sensitivity in the milligram scale. A correlation coefficient between quantitative reconstructed and nominal magnetic nanoparticle distributions above 0.6 was found for all measurements. Conclusion Besides other interesting features such as sufficient large field of view dimension for mice and rat studies, portability, and the ability to assess the quantitative magnetic nanoparticles distributions in real-time, the MC-ACB system is a promising tool for quantitative imaging of magnetic nanoparticles distributions in real-time, offering an affordable setup for easy access in clinical or laboratory environments.
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Affiliation(s)
- Guilherme Soares
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587, Berlin, Germany. .,Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, 18618-689, Brazil.
| | - Leonardo Pinto
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, 18618-689, Brazil
| | - Maik Liebl
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587, Berlin, Germany
| | - Gabriel Biasotti
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, 18618-689, Brazil
| | - Andre Prospero
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, 18618-689, Brazil
| | - Erick Stoppa
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, 18618-689, Brazil
| | - Andris Bakuzis
- Institute of Physics, Federal University of Goiás, Goiânia, 74690-900, Brazil
| | - Oswaldo Baffa
- Faculty of Philosophy, Sciences and Letters at Ribeirão Preto, University of São Paulo, Ribeirão Preto, Sao Paulo, 14040-900, Brazil
| | - Frank Wiekhorst
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587, Berlin, Germany
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Ding F, Guo R, Cui ZY, Hu H, Zhao G. Clinical application and research progress of extracellular slow wave recording in the gastrointestinal tract. World J Gastrointest Surg 2022; 14:544-555. [PMID: 35979419 PMCID: PMC9258241 DOI: 10.4240/wjgs.v14.i6.544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 03/21/2022] [Accepted: 05/17/2022] [Indexed: 02/06/2023] Open
Abstract
The physiological function of the gastrointestinal (GI) tract is based on the slow wave generated and transmitted by the interstitial cells of Cajal. Extracellular myoelectric recording techniques are often used to record the characteristics and propagation of slow wave and analyze the models of slow wave transmission under physiological and pathological conditions to further explore the mechanism of GI dysfunction. This article reviews the application and research progress of electromyography, bioelectromagnetic technology, and high-resolution mapping in animal and clinical experiments, summarizes the clinical application of GI electrical stimulation therapy, and reviews the electrophysiological research in the biliary system.
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Affiliation(s)
- Fan Ding
- Center of Gallbladder Disease, East Hospital of Tongji University, Shanghai 200120, China
- Institute of Gallstone Disease, Tongji University School of Medicine, Shanghai 200331, China
| | - Run Guo
- Department of Ultrasonography, East Hospital of Tongji University, Shanghai 200120, China
| | - Zheng-Yu Cui
- Department of Internal Medicine of Traditional Chinese Medicine, East Hospital of Tongji University, Shanghai 200120, China
| | - Hai Hu
- Center of Gallbladder Disease, East Hospital of Tongji University, Shanghai 200120, China
- Institute of Gallstone Disease, Tongji University School of Medicine, Shanghai 200331, China
| | - Gang Zhao
- Center of Gallbladder Disease, East Hospital of Tongji University, Shanghai 200120, China
- Institute of Gallstone Disease, Tongji University School of Medicine, Shanghai 200331, China
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Bezerra AT, Pinto LA, Rodrigues DS, Bittencourt GN, Mancera PFDA, Miranda JRDA. Classification of gastric emptying and orocaecal transit through artificial neural networks. MATHEMATICAL BIOSCIENCES AND ENGINEERING : MBE 2021; 18:9511-9524. [PMID: 34814356 DOI: 10.3934/mbe.2021467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Classical quantification of gastric emptying (GE) and orocaecal transit (OCT) based on half-life time T$ _{50} $, mean gastric emptying time (MGET), orocaecal transit time (OCTT) or mean caecum arrival time (MCAT) can lead to misconceptions when analyzing irregularly or noisy data. We show that this is the case for gastrointestinal transit of control and of diabetic rats. Addressing this limitation, we present an artificial neural network (ANN) as an alternative tool capable of discriminating between control and diabetic rats through GE and OCT analysis. Our data were obtained via biological experiments using the alternate current biosusceptometry (ACB) method. The GE results are quantified by T$ _{50} $ and MGET, while the OCT is quantified by OCTT and MCAT. Other than these classical metrics, we employ a supervised training to classify between control and diabetes groups, accessing sensitivity, specificity, $ f_1 $ score, and AUROC from the ANN. For GE, the ANN sensitivity is 88%, its specificity is 83%, and its $ f_1 $ score is 88%. For OCT, the ANN sensitivity is 100%, its specificity is 75%, and its $ f_1 $ score is 85%. The area under the receiver operator curve (AUROC) from both GE and OCT data is about 0.9 in both training and validation, while the AUCs for classical metrics are 0.8 or less. These results show that the supervised training and the binary classification of the ANN was successful. Classical metrics based on statistical moments and ROC curve analyses led to contradictions, but our ANN performs as a reliable tool to evaluate the complete profile of the curves, leading to a classification of similar curves that are barely distinguished using statistical moments or ROC curves. The reported ANN provides an alert that the use of classical metrics can lead to physiological misunderstandings in gastrointestinal transit processes. This ANN capability of discriminating diseases in GE and OCT processes can be further explored and tested in other applications.
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Affiliation(s)
- Anibal Thiago Bezerra
- Institute of Exact Sciences, Federal University of Alfenas-MG (UNIFAL-MG), Alfenas-MG 37133-840, Brazil
| | - Leonardo Antonio Pinto
- Institute of Biosciences, São Paulo State University (UNESP), Botucatu-SP 18618-689, Brazil
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Pinto L, Soares G, Próspero A, Stoppa E, Biasotti G, Paixão F, Santos A, Oliveira R, Miranda J. An easy and low-cost biomagnetic methodology to study regional gastrointestinal transit in rats. ACTA ACUST UNITED AC 2021; 66:405-412. [PMID: 33544465 DOI: 10.1515/bmt-2020-0202] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 01/19/2021] [Indexed: 12/12/2022]
Abstract
The identification of gastrointestinal (GI) motility disorders requires the evaluation of regional GI transit, and the development of alternative methodologies in animals has a significant impact on translational approaches. Therefore, the purpose of this study was to validate an easy and low-cost methodology (alternate current biosusceptometry - ACB) for the assessment of regional GI transit in rats through images. Rats were fed a test meal containing magnetic tracer and phenol red, and GI segments (stomach, proximal, medial and distal small intestine, and cecum) were collected to assess tracer's retention at distinct times after ingestion (0, 60, 120, 240, and 360 min). Images were obtained by scanning the segments, and phenol red concentration was determined by the sample's absorbance. The temporal retention profile, geometric center, gastric emptying, and cecum arrival were evaluated. The correlation coefficient between methods was 0.802, and the temporal retention of each segment was successfully assessed. GI parameters yielded comparable results between methods, and ACB images presented advantages as the possibility to visualize intrasegmental tracer distribution and the automated scan of the segments. The imaging approach provided a reliable assessment of several parameters simultaneously and may serve as an accurate and sensitive approach for regional GI research in rats.
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Affiliation(s)
- Leonardo Pinto
- Department of Biophysics and Pharmacology, São Paulo State University, Biosciences Institute of Botucatu, Botucatu, Brazil
| | - Guilherme Soares
- Department of Biophysics and Pharmacology, São Paulo State University, Biosciences Institute of Botucatu, Botucatu, Brazil
| | - André Próspero
- Department of Biophysics and Pharmacology, São Paulo State University, Biosciences Institute of Botucatu, Botucatu, Brazil
| | - Erick Stoppa
- Department of Biophysics and Pharmacology, São Paulo State University, Biosciences Institute of Botucatu, Botucatu, Brazil
| | - Gabriel Biasotti
- Department of Biophysics and Pharmacology, São Paulo State University, Biosciences Institute of Botucatu, Botucatu, Brazil
| | - Fabiano Paixão
- Science and Technology Institute, Federal University of São Paulo, São José dos Campos, Brazil
| | - Armênio Santos
- Department of Physiology and Pharmacology, Federal University of Ceará, Fortaleza, Brazil
| | - Ricardo Oliveira
- Ribeirão Preto Medical School, São Paulo University, Ribeirão Preto, Brazil
| | - José Miranda
- Department of Biophysics and Pharmacology, São Paulo State University, Biosciences Institute of Botucatu, Botucatu, Brazil
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Machado MPR, Gama LA, Beckmann APS, Hauschildt AT, Dall'Agnol DJR, Miranda JRA, Corá LA, Américo MF. Paternal obesity and its transgenerational effects on gastrointestinal function in male rat offspring. ACTA ACUST UNITED AC 2021; 54:e11116. [PMID: 34076145 PMCID: PMC8186378 DOI: 10.1590/1414-431x2020e11116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 04/16/2021] [Indexed: 11/25/2022]
Abstract
The interplay between obesity and gastrointestinal (GI) motility is contradictory, and the transgenerational influence on this parameter is unknown. We aimed to evaluate the GI function in a model of paternal obesity and two subsequent generations of their male offspring. Newborn male rats were treated with monosodium glutamate (MSG) and composed the F1 generation, while control rats (CONT) received saline. At 90 days, male F1 were mated with non-obese females to obtain male offspring (F2), which later mated with non-obese females for obtaining male offspring of F3 generation. Lee Index analysis was adopted to set up the obesity groups. Alternating current biosusceptometry (ACB) technique was employed to calculate GI transit parameters: mean gastric emptying time (MGET), mean cecum arrival time (MCAT), mean small intestinal transit time (MSITT), and gastric frequency and amplitude of contractions. Glucose, insulin, and leptin levels and duodenal morphometry were measured. F1 obese rats showed a decrease in the frequency and amplitude of gastric contractions, while obese rats from the F2 generation showed accelerated MGET and delayed MCAT and MSITT. Glucose and leptin levels were increased in F1 and F2 generations. Insulin levels decreased in F1, F2, and F3 generations. Duodenal morphometry was altered in all three generations. Obesity may have paternal transgenerational transmission, and it provoked disturbances in the gastrointestinal function of three generations.
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Affiliation(s)
- M P R Machado
- Instituto de Biociências, Universidade Estadual Paulista Júlio de Mesquita Filho, Botucatu, SP, Brasil
| | - L A Gama
- Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso, Barra do Garças, MT, Brasil
| | - A P S Beckmann
- Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso, Barra do Garças, MT, Brasil
| | - A T Hauschildt
- Departamento de Fisiologia e Farmacologia, Universidade Federal do Ceará, Fortaleza, CE, Brasil
| | - D J R Dall'Agnol
- Faculdade de Ciências Agrárias, Biológicas, Engenharia e da Saúde, Universidade do Estado de Mato Grosso, Tangará da Serra, MT, Brasil
| | - J R A Miranda
- Instituto de Biociências, Universidade Estadual Paulista Júlio de Mesquita Filho, Botucatu, SP, Brasil
| | - L A Corá
- Núcleo de Ciências Biológicas, NUCIB, Universidade Estadual de Ciências da Saúde de Alagoas (UNCISAL), Maceió, AL, Brasil
| | - M F Américo
- Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso, Barra do Garças, MT, Brasil
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Gama LA, Rocha Machado MP, Beckmann APS, Miranda JRDA, Corá LA, Américo MF. Gastrointestinal motility and morphology in mice: Strain-dependent differences. Neurogastroenterol Motil 2020; 32:e13824. [PMID: 32096330 DOI: 10.1111/nmo.13824] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Revised: 01/31/2020] [Accepted: 02/04/2020] [Indexed: 12/15/2022]
Abstract
BACKGROUND BALB/c and C57BL/6 mice are widely used in biomedical research; however, the differences between strains are still underestimated. Our aims were to develop an experimental protocol to evaluate the duodenal contractility and gastrointestinal transit in mice using the Alternating Current Biosusceptometry (ACB) technique and to compare gastrointestinal motor function and morphology between BALB/c and C57BL/6 strains. METHODS Male mice were used in experiments (a) duodenal contractility: animals which had a magnetic marker surgically fixed in the duodenum to determine the frequency and amplitude of contractions and (b) gastrointestinal transit: animals which ingested a magnetically marked chow to calculate the Oro-Anal Transit Time (OATT) and the Fecal Pellet Elimination Rate (FPER). The animals were killed after the experiments for organ collection and morphometric analysis. KEY RESULTS BALB/c and C57BL/6 had two different duodenal frequencies (high and low) with similar amplitudes. After 10 hours of monitoring, BALB/c eliminated around 89% of the ingested marker and C57BL/6 eliminated 33%; OATT and FPER were slower for C57BL/6 compared with BALB/c. The OATT and amplitude of low frequency had a strong positive correlation in C57BL/6. For BALB/c, the gastric muscular layer was thicker compared to that measured for C57BL/6. CONCLUSIONS AND INFERENCES The experimental protocol to evaluate duodenal contractility and fecal magnetic pellets output using the ACB technique in mice was successfully established. BALB/c strains had higher duodenal frequencies and a shorter time to eliminate the ingested marker. Our results showed differences in both motor function and gastrointestinal morphology between BALB/c and C57BL/6 strains.
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Affiliation(s)
- Loyane Almeida Gama
- Institute of Biosciences, São Paulo State University, UNESP, Botucatu, Brazil
| | | | - Ana Paula Simões Beckmann
- Institute of Biological Sciences and Health, Federal University of Mato Grosso, UFMT, Barra do Garças, Brazil
| | | | | | - Madileine Francely Américo
- Institute of Biosciences, São Paulo State University, UNESP, Botucatu, Brazil.,Institute of Biological Sciences and Health, Federal University of Mato Grosso, UFMT, Barra do Garças, Brazil
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Cruz PN, Gama LA, Américo MF, Pertuzatti PB. Baru ( Dipteryx alataVogel) almond and dairy desserts with baru regulates gastrointestinal transit in rats. J FOOD PROCESS PRES 2019. [DOI: 10.1111/jfpp.14167] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Pollyanna Nogueira Cruz
- Engenharia de Alimentos, Instituto de Ciências Exatas e da Terra Universidade Federal de Mato Grosso Barra do Garças Brazil
| | - Loyane Almeida Gama
- Programa de Pós‐Graduação em Imunologia e Parasitologia Básicas e Aplicadas, Instituto de Ciências Biológicas e da Saúde Universidade Federal de Mato Grosso Barra do Garças Brazil
| | - Madileine Francely Américo
- Programa de Pós‐Graduação em Imunologia e Parasitologia Básicas e Aplicadas, Instituto de Ciências Biológicas e da Saúde Universidade Federal de Mato Grosso Barra do Garças Brazil
| | - Paula Becker Pertuzatti
- Engenharia de Alimentos, Instituto de Ciências Exatas e da Terra Universidade Federal de Mato Grosso Barra do Garças Brazil
- Programa de Pós‐Graduação em Imunologia e Parasitologia Básicas e Aplicadas, Instituto de Ciências Biológicas e da Saúde Universidade Federal de Mato Grosso Barra do Garças Brazil
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Calabresi MFF, Tanimoto A, Próspero AG, Mello FPF, Soares G, Di Stasi LC, Miranda JRA. Changes in colonic contractility in response to inflammatory bowel disease: Long-term assessment in a model of TNBS-induced inflammation in rats. Life Sci 2019; 236:116833. [PMID: 31491456 DOI: 10.1016/j.lfs.2019.116833] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 08/22/2019] [Accepted: 09/02/2019] [Indexed: 02/06/2023]
Abstract
AIMS Inflammatory bowel disease is a chronic relapsing inflammation that affects the gastrointestinal tract, causing changes in colonic motility. The evolution of these changes is not completely understood and possibly related to symptoms that appear in different degrees of the intestinal inflammation. Therefore, our aim is evaluate during 14 days of assessment aspects of colonic contractility using 2,4,6-trinitrobenzenesulfonic acid (TNBS) model of inflammation in rats and associate the inflammatory process with colonic motility. METHODS Contractility and inflammatory parameters were assessed in the same animal in six different moments: before intestinal inflammation induction, 2, 5, 8, 11, and 14 days after induction. The mechanical activity was determined by alternating current biosusceptometry (ACB) and subdivided into rhythmic propagating ripples (RPR) and rhythmic propulsive motor complexes (RPMC). We assessed inflammation by determining myeloperoxidase activity in feces. RESULTS Transient and permanent changes were observed in colonic motility as a function of the inflammatory process evaluated through myeloperoxidase activity. We identified two contraction profiles: RPR and RPMC. The microscopic analysis demonstrated a depth of damage caused by an injury that was associated with changes in motility. CONCLUSIONS We implemented a robust and adequate (specific) signal processing to quantify two measured colonic frequency patterns. Thus, we performed a detailed temporal analysis of the consequences of TNBS-induced inflammation on colonic motility in rats. Our approach enables further long-term assessments in the same animal with different mechanisms and duration of injury, remission, treatments and their motor consequences.
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Affiliation(s)
- Marcos F F Calabresi
- Laboratory of Biomagnetism, Department of Physics and Biophysics, Bioscience Institute, São Paulo State University, Botucatu, São Paulo, Brazil.
| | - Alexandre Tanimoto
- Laboratory of Phytomedicines, Pharmacology and Biotechnology, Department of Pharmacology, Bioscience Institute, São Paulo State University, Botucatu, São Paulo, Brazil.
| | - André G Próspero
- Laboratory of Biomagnetism, Department of Physics and Biophysics, Bioscience Institute, São Paulo State University, Botucatu, São Paulo, Brazil.
| | - Fabio P F Mello
- Laboratory of Biomagnetism, Department of Physics and Biophysics, Bioscience Institute, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Guilherme Soares
- Laboratory of Biomagnetism, Department of Physics and Biophysics, Bioscience Institute, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Luiz C Di Stasi
- Laboratory of Phytomedicines, Pharmacology and Biotechnology, Department of Pharmacology, Bioscience Institute, São Paulo State University, Botucatu, São Paulo, Brazil.
| | - José R A Miranda
- Laboratory of Biomagnetism, Department of Physics and Biophysics, Bioscience Institute, São Paulo State University, Botucatu, São Paulo, Brazil.
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Hauschildt AT, Corá LA, Volpato GT, Sinzato YK, Damasceno DC, Américo MF. Mild diabetes: long-term effects on gastric motility evaluated in rats. Int J Exp Pathol 2018; 99:29-37. [PMID: 29479759 PMCID: PMC5917388 DOI: 10.1111/iep.12262] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 01/04/2018] [Indexed: 12/22/2022] Open
Abstract
Moderate hyperglycaemic levels seem to be related to abnormal gastric motility in diabetes mellitus. However, experimental models designed to evaluate the relationship between motility and diabetes over time are not yet well established. Our objective was to investigate the long-term effects of mild diabetes on gastric motility in rats. Newborn male rats received streptozotocin (mild diabetes groups - MD) or vehicle (control groups - C), and both groups were evaluated after 3 (C3 and MD3) and 6 months (C6 and MD6) postinduction. Mild diabetic animals (MD3 and MD6) showed moderately elevated blood glucose and decreased insulin levels compared with control (C3 and C6). Insulin secretion was enhanced in MD6 compared with MD3, most likely due to partial β-cell regeneration indicated by HOMA-β. In HOMA-IR, it was noticed that MD6 animals had impaired insulin response compared with MD3. Gastric emptying was faster, amplitude of contraction was stronger in MD6 compared with MD3, and in both groups, the differences were significant when compared with control animals. A significant abnormal rhythmic index was calculated for the mild diabetic groups, despite unchanged mean frequency of contraction. In conclusion, despite increased insulin levels over time, constant levels of moderate hyperglycaemia are also related to abnormal gastric motility and impairment of gastric function.
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Affiliation(s)
| | - Luciana A. Corá
- Alagoas State University of Health Sciences – UNCISALMaceió/ALBrazil
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Gastrointestinal Motility, Mucosal Mast Cell, and Intestinal Histology in Rats: Effect of Prednisone. BIOMED RESEARCH INTERNATIONAL 2017; 2017:4637621. [PMID: 29057260 PMCID: PMC5625752 DOI: 10.1155/2017/4637621] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Revised: 07/20/2017] [Accepted: 08/13/2017] [Indexed: 12/20/2022]
Abstract
Our aim was to verify the effects of prednisone related to gastrointestinal motility, intestinal histology, and mucosal mast cells in rats. Two-month-old male Wistar rats were randomly assigned to control group (vehicle) animals receiving saline 0.9% (n = 7) or treated orally with 0.625 mg/kg/day of prednisone (n = 7) or 2.5 mg/kg/day of prednisone (n = 7) during 15 days. Mast cells and other histologic analyses were performed in order to correlate to gastric emptying, cecum arrival, and small intestine transit evaluated by Alternating Current Biosusceptometry. Results showed that prednisone in adult rats increased the frequency of gastric contractions, hastened gastric emptying, slowed small intestinal transit, and reduced mucosal mast cells. Histologically, the treatment with both doses of prednisone decreased villus height, whereas longitudinal and circular muscles and crypt depth were not affected. These findings indicate an impairment of intestinal absorption which may be linked to several GI dysfunctions and symptoms. The relationship between gastrointestinal motor disorders and cellular immunity needs to be clarified in experimental studies since prednisone is one of the most prescribed glucocorticoids worldwide.
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Dall'Agnol DJR, Corá LA, Teixeira MDCB, de Lima MB, Gama LA, Miranda JRDA, Américo MF. Gastrointestinal disorders after immunosuppression: an experimental model to evaluate the influence of monotherapy on motility parameters. Exp Physiol 2017; 102:924-933. [PMID: 28556421 DOI: 10.1113/ep086267] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 05/19/2017] [Indexed: 12/19/2022]
Abstract
NEW FINDINGS What is the central question of this study? The aim was to propose an animal model for investigating the effects of immunosuppressive monotherapy on gastrointestinal motility using a non-invasive biomagnetic technique. What is main finding and its importance? In our experimental study, immunosuppressive drugs currently in use accelerated gastric emptying whilst increasing the frequency and amplitude of gastric contractions after treatment, except for Mycophenolate and azathioprine. Alternating current biosusceptometry is a useful tool to evaluate side-effects of drugs on the gastrointestinal tract, which will help in understanding the symptoms and improving clinical management of patients. The aim was to propose an animal model for investigating the effects of immunosuppressive monotherapy on gastrointestinal motility using a non-invasive biomagnetic technique. Male Wistar rats were randomly distributed into the following treatment groups: ciclosporin, tacrolimus, prednisone, sirolimus, mycophenolate mofetil, everolimus, azathioprine and control. Each animal was treated for 14 days by gavage with dosages ranging from 1 to 20 mg kg-1 day-1 considering the area-to-volume ratio and hepatic metabolism. Gastrointestinal transit and gastric contractility measurements were evaluated by alternating current biosusceptometry before and after treatment. Gastric emptying was faster in animals treated with tacrolimus, prednisone, sirolimus and everolimus compared with control animals (126.7 ± 12.7 min). There was a significant increase in the frequency of contractions after ciclosporin, tacrolimus, azathioprine and sirolimus treatment compared with control animals (4.6 ± 0.3 cycles min-1 ). Increases in the amplitude of contraction were observed after treatment with tacrolimus, sirolimus and everolimus compared with control rats (34.9 ± 6.0 dB). The results showed that our animal model was suitable for demonstrating that most immunosuppressive drugs currently in use impaired at least one gastrointestinal motility parameter. As a non-invasive technique, alternating current biosusceptometry is a potentially useful tool for evaluation of side-effects of drugs in gastrointestinal tract, helping us to understand the symptoms to improve clinical management of patients.
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Affiliation(s)
- Denize Jussara Rupolo Dall'Agnol
- Postgraduate Program in Pharmacology and Biotechnology - São Paulo State University - UNESP, Institute of Biosciences, Botucatu-SP, Brazil
| | | | | | - Maysa Bruno de Lima
- Institute of Biological Sciences and Health - Federal University of Mato Grosso - UFMT, Barra do Garças, Mato Grosso, Brazil
| | - Loyane Almeida Gama
- Postgraduate Program in Pharmacology and Biotechnology - São Paulo State University - UNESP, Institute of Biosciences, Botucatu-SP, Brazil
| | - José Ricardo de Arruda Miranda
- Department of Physics and Biophysics - São Paulo State University - UNESP, Institute of Biosciences - Botucatu/SP, Brazil
| | - Madileine Francely Américo
- Institute of Biological Sciences and Health - Federal University of Mato Grosso - UFMT, Barra do Garças, Mato Grosso, Brazil
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13
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Real-time liver uptake and biodistribution of magnetic nanoparticles determined by AC biosusceptometry. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2017; 13:1519-1529. [DOI: 10.1016/j.nano.2017.02.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 01/30/2017] [Accepted: 02/05/2017] [Indexed: 01/05/2023]
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14
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Matos JF, Americo MF, Sinzato YK, Volpato GT, Corá LA, Calabresi MFF, Oliveira RB, Damasceno DC, Miranda JRA. Role of sex hormones in gastrointestinal motility in pregnant and non-pregnant rats. World J Gastroenterol 2016; 22:5761-5768. [PMID: 27433089 PMCID: PMC4932211 DOI: 10.3748/wjg.v22.i25.5761] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/07/2016] [Accepted: 06/02/2016] [Indexed: 02/06/2023] Open
Abstract
AIM: To correlate gastric contractility, gastrointestinal transit, and hormone levels in non-pregnant (estrous cycle) and pregnant rats using noninvasive techniques.
METHODS: Female rats (n = 23) were randomly divided into (1) non-pregnant, (contractility, n = 6; transit, n = 6); and (2) pregnant (contractility, n = 5; transit, n = 6). In each estrous cycle phase or at 0, 7, 14, and 20 d after the confirmation of pregnancy, gastrointestinal transit was recorded by AC biosusceptometry (ACB), and gastric contractility was recorded by ACB and electromyography. After each recording, blood samples were obtained for progesterone and estradiol determination.
RESULTS: In the estrous cycle, despite fluctuations of sex hormone levels, no significant changes in gastrointestinal motility were observed. Days 7 and 14 of pregnancy were characterized by significant changes in the frequency of contractions (3.90 ± 0.42 cpm and 3.60 ± 0.36 cpm vs 4.33 ± 0.25 cpm) and gastric emptying (168 ± 17 min and 165 ± 15 min vs 113 ± 15 min) compared with day 0. On these same days, progesterone levels significantly increased compared with control (54.23 ± 15.14 ng/mL and 129.96 ± 30.52 ng/mL vs 13.25 ± 6.31 ng/mL). On day 14, we observed the highest level of progesterone and the lowest level of estradiol compared with day 0 (44.3 ± 15.18 pg/mL vs 24.96 ± 5.96 pg/mL).
CONCLUSION: Gastrointestinal motility was unaffected by the estrous cycle. In our data, high progesterone and low estradiol levels can be associated with decreased contraction frequency and slow gastric emptying.
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15
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Martins ML, Ignazzi R, Eckert J, Watts B, Kaneno R, Zambuzzi WF, Daemen L, Saeki MJ, Bordallo HN. Restricted mobility of specific functional groups reduces anti-cancer drug activity in healthy cells. Sci Rep 2016; 6:22478. [PMID: 26932808 PMCID: PMC4773877 DOI: 10.1038/srep22478] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 02/08/2016] [Indexed: 12/23/2022] Open
Abstract
The most common cancer treatments currently available are radio- and chemo-therapy. These therapies have, however, drawbacks, such as, the reduction in quality of life and the low efficiency of radiotherapy in cases of multiple metastases. To lessen these effects, we have encapsulated an anti-cancer drug into a biocompatible matrix. In-vitro assays indicate that this bio-nanocomposite is able to interact and cause morphological changes in cancer cells. Meanwhile, no alterations were observed in monocytes and fibroblasts, indicating that this system might carry the drug in living organisms with reduced clearance rate and toxicity. X-rays and neutrons were used to investigate the carrier structure, as well as to assess the drug mobility within the bio-nanocomposite. From these unique data we show that partial mobility restriction of active groups of the drug molecule suggests why this carrier design is potentially safer to healthy cells.
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Affiliation(s)
- Murillo L. Martins
- Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
- Instituto de Biociências - Universidade Estadual Paulista – CP 510, 18618-970 Botucatu–SP, Brazil
| | - Rosanna Ignazzi
- Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Juergen Eckert
- Department of Chemistry, University of South Florida, 4202 E. Fowler Ave., Tampa, Florida 33620, United States
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Benjamin Watts
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Ramon Kaneno
- Instituto de Biociências - Universidade Estadual Paulista – CP 510, 18618-970 Botucatu–SP, Brazil
| | - Willian F. Zambuzzi
- Instituto de Biociências - Universidade Estadual Paulista – CP 510, 18618-970 Botucatu–SP, Brazil
| | - Luke Daemen
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Margarida J. Saeki
- Instituto de Biociências - Universidade Estadual Paulista – CP 510, 18618-970 Botucatu–SP, Brazil
| | - Heloisa N. Bordallo
- Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
- European Spallation Source ESS AB, PO Box 176, SE-221 00 Lund, Sweden
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16
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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] [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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Dall'Agnol DJR, Hauschildt AT, Lima MB, Corá LA, Teixeira MCB, Américo MF. Effects of immunosuppressive drugs on gastrointestinal transit of rats: effects of tacrolimus, cyclosporine, and prednisone. Transplant Proc 2015; 46:1872-4. [PMID: 25131057 DOI: 10.1016/j.transproceed.2014.05.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Triple immunosuppressive therapy after organ transplantation may cause several gastrointestinal disturbances. It is difficult to identify which drug causes more complications, requiring an appropriate animal model. The aim was to compare the gastrointestinal transit in immunosuppressed rats under triple immunosuppressive therapy. Male rats were immunosuppressed by gavage during 14 days with tacrolimus (n = 10), cyclosporine (n = 12), and prednisone (n = 9). Animals received a magnetic pellet before (control) and after treatment that was monitored at predetermined intervals by AC biosusceptometry, a noninvasive and radiation-free technique. The following parameters were measured: creatinine serum, mean time of gastric emptying (MGET), mean time to reach cecum (MCAT), and mean transit time through small bowel (MSBTT). The differences were analyzed by ANOVA (Tukey). Our results showed that MGET of animals treated with prednisone, cyclosporine, and tacrolimus were reduced compared with control subjects (P < .03, P < .009, and P < .002, respectively). There was no difference in MCAT, whereas MSBTT was longer for tacrolimus and prednisone compared with control subjects (P < .004 and P < .004, respectively). Also, prednisone and tacrolimus presented a reduced MGET (P < .05 and P < .01, respectively) compared with cyclosporine. Our data showed a low serum creatinine level and no difference among groups regarding renal function. In summary, cyclosporine has less effect on the gastrointestinal transit; however, all of these drugs should be carefully prescribed to prevent gastrointestinal symptoms and improve quality of life after transplantation.
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Affiliation(s)
- D J R Dall'Agnol
- Universidade Federal de Mato Grosso-UFMT, Barra do Garças/MT, Brazil
| | - A T Hauschildt
- Universidade Federal de Mato Grosso-UFMT, Barra do Garças/MT, Brazil
| | - M B Lima
- Universidade Federal de Mato Grosso-UFMT, Barra do Garças/MT, Brazil
| | - L A Corá
- Universidade Estadual de Ciências da Saúde de Alagoas-UNCISAL, Maceió/AL, Brazil.
| | - M C B Teixeira
- Universidade Estadual de Ciências da Saúde de Alagoas-UNCISAL, Maceió/AL, Brazil
| | - M F Américo
- Universidade Federal de Mato Grosso-UFMT, Barra do Garças/MT, Brazil
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18
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Bruno AC, Sampaio DRT, Pavan TZ, Baffa O, Carneiro AAO. A hybrid transducer to evaluate stomach emptying by ultrasound and susceptometric measurements: an in vivo feasibility study. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2015; 62:1288-1294. [PMID: 26168175 DOI: 10.1109/tuffc.2014.006950] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Gastric emptying reflects a diversity of important physiological functions. Alternating current biosusceptometry (ACB) is an inexpensive, radiation-free, and minimally invasive method to evaluate gastric emptying, but its response depends on the spatial distribution of the magnetized material and does not provide precise anatomical information. The hybrid transducer, which combines ACB and an ultrasound probe, is an alternative to improve susceptometry measurements, namely the spatial localization of the magnetized source. In this study, initial stomach emptying, in rats, was monitored with the aid of the hybrid transducer. Yogurt mixed with ferrite particles was injected into the rat's stomach. The hybrid transducer was placed on the rat's abdomen during experiments, and the susceptometry signal and magnetomotive ultrasound (MMUS) images were saved and postprocessed. MMUS highlighted the movement of magnetic particles due to magnetic force from ACB excitation coils, and showed the rat's stomach location. In this feasibility study, we monitored the stomach emptying of 4 rats for 20 min. The mean relative ACB signal decayed by 4.6 ± 0.1%, and the mean relative area of MMUS images decreased by 4.5 ± 0.2%, after 20 min postingestion of the magnetic meal due to stomach emptying. In a second experiment, 3-D MMUS images from axial sequences were obtained by spatially translating the hybrid transducer, providing details of the stomach wall, which may enable minimally invasive detection of abnormalities. In conclusion, the MMUS image increased ACB spatial resolution and furnished additional anatomical information.
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19
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Martins ML, Calabresi MF, Quini C, Matos JF, Miranda JR, Saeki MJ, Bordallo HN. Enhancing the versatility of alternate current biosusceptometry (ACB) through the synthesis of a dextrose-modified tracer and a magnetic muco-adhesive cellulose gel. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 48:80-5. [DOI: 10.1016/j.msec.2014.11.059] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Accepted: 11/22/2014] [Indexed: 02/06/2023]
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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] [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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Holmes GM, Swartz EM, McLean MS. Fabrication and implantation of miniature dual-element strain gages for measuring in vivo gastrointestinal contractions in rodents. J Vis Exp 2014:51739. [PMID: 25285858 DOI: 10.3791/51739] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Gastrointestinal dysfunction remains a major cause of morbidity and mortality. Indeed, gastrointestinal (GI) motility in health and disease remains an area of productive research with over 1,400 published animal studies in just the last 5 years. Numerous techniques have been developed for quantifying smooth muscle activity of the stomach, small intestine, and colon. In vitro and ex vivo techniques offer powerful tools for mechanistic studies of GI function, but outside the context of the integrated systems inherent to an intact organism. Typically, measuring in vivo smooth muscle contractions of the stomach has involved an anesthetized preparation coupled with the introduction of a surgically placed pressure sensor, a static pressure load such as a mildly inflated balloon or by distending the stomach with fluid under barostatically-controlled feedback. Yet many of these approaches present unique disadvantages regarding both the interpretation of results as well as applicability for in vivo use in conscious experimental animal models. The use of dual element strain gages that have been affixed to the serosal surface of the GI tract has offered numerous experimental advantages, which may continue to outweigh the disadvantages. Since these gages are not commercially available, this video presentation provides a detailed, step-by-step guide to the fabrication of the current design of these gages. The strain gage described in this protocol is a design for recording gastric motility in rats. This design has been modified for recording smooth muscle activity along the entire GI tract and requires only subtle variation in the overall fabrication. Representative data from the entire GI tract are included as well as discussion of analysis methods, data interpretation and presentation.
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Affiliation(s)
- Gregory M Holmes
- Department of Neural and Behavioral Sciences, Penn State University College of Medicine;
| | - Emily M Swartz
- Department of Neural and Behavioral Sciences, Penn State University College of Medicine
| | - Margaret S McLean
- Department of Neural and Behavioral Sciences, Penn State University College of Medicine
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22
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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] [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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23
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Teixeira M, Magalhães I, Galvão P, Souza G, Miranda J, Oliveira R, Corá L. Assessment of Gastrointestinal Motility in Renal Transplant Recipients by Alternate Current Biosusceptometry. Transplant Proc 2012; 44:2384-7. [DOI: 10.1016/j.transproceed.2012.07.048] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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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] [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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