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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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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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