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Aydin BN, Stinson EJ, Travis KT, Krakoff J, Rodzevik T, Chang DC, Gluck ME. Reduced plasma interleukin-6 concentration after transcranial direct current stimulation to the prefrontal cortex. Behav Brain Res 2024; 474:115201. [PMID: 39151649 DOI: 10.1016/j.bbr.2024.115201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2024] [Revised: 07/26/2024] [Accepted: 08/10/2024] [Indexed: 08/19/2024]
Abstract
OBJECTIVES Transcranial direct stimulation (tDCS) targeted to the dorsolateral prefrontal cortex (DLPFC) reduces food intake and hunger, but its effects on circulating factors are unclear. We assessed the effect of repeated administration of tDCS to the left DLPFC (L-DLPFC) on concentrations of pro/anti-inflammatory and appetitive hormone concentrations. MATERIALS AND METHODS Twenty-nine healthy adults with obesity (12 M; 42±11 y; BMI=39±8 kg/m2) received 3 consecutive inpatient sessions of either anodal or sham tDCS targeted to the L-DLPFC during a period of ad libitum food intake. Fasting plasma concentrations of IL-6, orexin, cortisol, TNF-α, IL-1β, ghrelin, PYY, and GLP-1 were measured before the initial and after the final tDCS sessions. RESULTS IL-6 (β=-0.92 pg/ml p=0.03) decreased in the anodal group compared with sham, even after adjusting for kcal intake; there were no changes in other hormones. Mean kcal intake was associated with higher IL-1β and ghrelin concentrations after the ad libitum period (β=0.00018 pg/ml/kcal, p=0.03; β=0.00011 pg/ml/kcal, p=0.02; respectively), but not differ by intervention groups. CONCLUSIONS IL-6 concentrations were reduced following anodal tDCS to the L-DLPFC independent of ad libitum intake. IL-6 concentrations reflect the inflammatory state of adiposity and may affect eating behavior and weight gain. These findings provide evidence of therapeutic benefit of tDCS.
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Affiliation(s)
- Beyza N Aydin
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Phoenix, AZ, United States
| | - Emma J Stinson
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Phoenix, AZ, United States
| | - Katherine T Travis
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Phoenix, AZ, United States
| | - Jonathan Krakoff
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Phoenix, AZ, United States
| | - Theresa Rodzevik
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Phoenix, AZ, United States
| | - Douglas C Chang
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Phoenix, AZ, United States
| | - Marci E Gluck
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Phoenix, AZ, United States.
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de Castro JM, de Freitas JS, Stein DJ, de Macedo IC, Caumo W, Torres ILS. Transcranial Direct Current Stimulation (tDCS) Promotes state-dependent Effects on Neuroinflammatory and Behavioral Parameters in rats Chronically Exposed to Stress and a Hyper-Palatable Diet. Neurochem Res 2023; 48:3042-3054. [PMID: 37326900 DOI: 10.1007/s11064-023-03965-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 05/31/2023] [Accepted: 06/06/2023] [Indexed: 06/17/2023]
Abstract
Chronic stress is a common condition affecting health, often associated with unhealthy eating habits. Transcranial direct current stimulation (tDCS) has been proposed to address these issues. Thus, this research investigated the effects of tDCS on biometric, behavioral, and neurochemical parameters in chronically stressed rats fed a hyper-palatable cafeteria diet (CAFD). The study lasted 8 weeks, with CAFD exposure and/or chronic restraint stress model (CRS - 1 h/day, 5 days/week, for 7 weeks) started concurrently. tDCS or sham sessions were applied between days 42 and 49 (0.5 mA, 20 min/day). CAFD increased body weight, caloric consumption, adiposity, and liver weight. It also altered central parameters, reducing anxiety and cortical levels of IL-10 and BDNF. In turn, the CRS resulted in increased adrenals in rats with standard diet (SD), and anxiety-like and anhedonic behaviors in rats with CAFD. tDCS provided neurochemical shifts in CAFD-fed stressed rats increasing central levels of TNF-α and IL-10, while in stressed rats SD-fed induced a decrease in the adrenals weight, relative visceral adiposity, and serum NPY levels. These data demonstrated the anxiolytic effect of CAFD and anxiogenic effect of stress in CAFD-fed animals. In addition, tDCS promoted state-dependent effects on neuroinflammatory and behavioral parameters in rats chronically exposed to stress and a hyper-palatable diet. These findings provide primary evidence for additional mechanistic and preclinical studies of the tDCS technique for stress-related eating disorders, envisioning clinical applicability.
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Affiliation(s)
- Josimar Macedo de Castro
- Postgraduate Program in Medicine: Medical Sciences, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
- Laboratory of Pain Pharmacology and Neuromodulation, Preclinical Investigations - Hospital de Clínicas de Porto Alegre - HCPA, Porto Alegre, RS, Brazil
- Nucleus of Pain Pharmacology and Neuromodulation - HCPA, RS, Porto Alegre, Brazil
- Animal Experimentation Unit and Research and Postgraduate Group - HCPA, Porto Alegre, RS, Brazil
| | - Joice Soares de Freitas
- Laboratory of Pain Pharmacology and Neuromodulation, Preclinical Investigations - Hospital de Clínicas de Porto Alegre - HCPA, Porto Alegre, RS, Brazil
| | - Dirson João Stein
- Postgraduate Program in Medicine: Medical Sciences, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
- Laboratory of Pain Pharmacology and Neuromodulation, Preclinical Investigations - Hospital de Clínicas de Porto Alegre - HCPA, Porto Alegre, RS, Brazil
- Nucleus of Pain Pharmacology and Neuromodulation - HCPA, RS, Porto Alegre, Brazil
- Animal Experimentation Unit and Research and Postgraduate Group - HCPA, Porto Alegre, RS, Brazil
| | - Isabel Cristina de Macedo
- Laboratory of Pain Pharmacology and Neuromodulation, Preclinical Investigations - Hospital de Clínicas de Porto Alegre - HCPA, Porto Alegre, RS, Brazil
- Nucleus of Pain Pharmacology and Neuromodulation - HCPA, RS, Porto Alegre, Brazil
| | - Wolnei Caumo
- Postgraduate Program in Medicine: Medical Sciences, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
- Nucleus of Pain Pharmacology and Neuromodulation - HCPA, RS, Porto Alegre, Brazil
| | - Iraci L S Torres
- Postgraduate Program in Medicine: Medical Sciences, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
- Laboratory of Pain Pharmacology and Neuromodulation, Preclinical Investigations - Hospital de Clínicas de Porto Alegre - HCPA, Porto Alegre, RS, Brazil.
- Nucleus of Pain Pharmacology and Neuromodulation - HCPA, RS, Porto Alegre, Brazil.
- Animal Experimentation Unit and Research and Postgraduate Group - HCPA, Porto Alegre, RS, Brazil.
- Hospital de Clínicas de Porto Alegre - HCPA, Rua Ramiro Barcelos, n. 2350. Bairro Santa Cecília 90035-903, Porto Alegre, RS, Brazil.
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Effects of neuromodulation on executive functions and food desires in individuals with obesity: a systematic review. NUTR HOSP 2023; 40:177-185. [PMID: 36537330 DOI: 10.20960/nh.04100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Introduction Objective: to describe the effects of neuromodulation on the performance of executive functions in overweight and/or individuals with obesity. Methods: articles published in PubMed, ScienceDirect, BIREME, and Web of Science databases were selected using the following combination of descriptors: ("problem solving" OR "executive function" OR memory) AND (tDCS OR TMS) AND obesity. After applying the selection criteria, 08 articles were included for analysis. Results: the articles included had an average of 30.1 participants per study, with a minimum of 12 and a maximum of 76. The overall nutritional status ranged from underweight to grade 3 obesity, and the general mean body mass index was 28,1 kg/m2. Regarding the instruments used to assess executive functions, the most frequent were: the flanker paradigm; binocular rivalry for Continuous Flash Suppression (bCFS/NoCFS); Stroop task; Go/No-Go task; and N-back task. The primary outcomes were dependent on the neuromodulation target site. Reduced food craving and improved performance in the active group were observed from decreased response time and increased precision in cognitive tasks. Conclusion: neuromodulation can generate changes in executive functions, reducing food cravings in overweight and individuals with obesity.
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Leonardo S, Fregni F. Association of inflammation and cognition in the elderly: A systematic review and meta-analysis. Front Aging Neurosci 2023; 15:1069439. [PMID: 36815174 PMCID: PMC9939705 DOI: 10.3389/fnagi.2023.1069439] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 01/05/2023] [Indexed: 02/09/2023] Open
Abstract
Background The development of mild cognitive impairment (MCI) and Alzheimer's disease (AD) may be associated with an inflammatory process. Inflammatory cytokines may be a surrogate for systemic inflammation leading to worsening neurological function. We aim to investigate the association between cognitive impairment and inflammation by pooling and analyzing the data from previously published studies. Methods We performed a systematic literature search on MEDLINE, PubMed, Embase, Web of Science, and Scopus for prospective longitudinal and cross-sectional studies evaluating the relationship between inflammation and cognitive functions. Results A total of 79 articles were included in our systematic review and meta-analysis. Pooled estimates from cross-sectional studies have demonstrated an increased level of C-reactive protein (CRP) [Hedges's g 0.35, 95% CI (0.16, 0.55), p < 0.05], IL-1β [0.94, 95% CI (-0.04, 1.92), p < 0.05], interleukin-6 (IL-6) [0.46, 95% CI (0.05, 0.88), p < 0.005], TNF alpha [0.22, 95% CI (-0.24, 0.68), p < 0.05], sTNFR-1 [0.74, 95% CI (0.46, 1.02), p < 0.05] in AD compared to controls. Similarly, higher levels of IL-1β [0.17, 95% CI (0.05, 0.28), p < 0.05], IL-6 [0.13, 95% CI (0.08, 0.18), p < 0.005], TNF alpha [0.28, 95% CI (0.07, 0.49), p < 0.05], sTNFR-1 [0.21, 95% CI (0.05, 0.48), p < 0.05] was also observed in MCI vs. control samples. The data from longitudinal studies suggested that levels of IL-6 significantly increased the risk of cognitive decline [OR = 1.34, 95% CI (1.13, 1.56)]. However, intermediate levels of IL-6 had no significant effect on the final clinical endpoint [OR = 1.06, 95% CI (0.8, 1.32)]. Conclusion The data from cross-sectional studies suggest a higher level of inflammatory cytokines in AD and MCI as compared to controls. Moreover, data from longitudinal studies suggest that the risk of cognitive deterioration may increase by high IL-6 levels. According to our analysis, CRP, antichymotrypsin (ACT), Albumin, and tumor necrosis factor (TNF) alpha may not be good surrogates for neurological degeneration over time.
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Affiliation(s)
- Sofia Leonardo
- Ph.D. Department, Universidad Francisco Marroquín, Guatemala City, Guatemala,*Correspondence: Sofia Leonardo,
| | - Felipe Fregni
- Center for Neuromodulation and Clinical Research Learning, Spaulding Rehabilitation Hospital and Massachusetts General Hospital, Boston, MA, United States
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Ethridge VT, Gargas NM, Sonner MJ, Moore RJ, Romer SH, Hatcher-Solis C, Rohan JG. Effects of transcranial direct current stimulation on brain cytokine levels in rats. Front Neurosci 2022; 16:1069484. [PMID: 36620466 PMCID: PMC9822516 DOI: 10.3389/fnins.2022.1069484] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 12/05/2022] [Indexed: 01/05/2023] Open
Abstract
Transcranial direct current stimulation (tDCS) has shown therapeutic potential to mitigate symptoms of various neurological disorders. Studies from our group and others used rodent models to demonstrate that tDCS modulates synaptic plasticity. We previously showed that 30 min of 0.25 mA tDCS administered to rats induced significant enhancement in the synaptic plasticity of hippocampal neurons. It has also been shown that tDCS induces expression of proteins known to mediate synaptic plasticity. This increase in synaptic plasticity may underly the observed therapeutic benefits of tDCS. However, the anti-inflammatory benefits of tDCS have not been thoroughly elucidated. Here we report that three sessions of tDCS spaced 1-3 weeks apart can significantly reduce levels of several inflammatory cytokines in brains of healthy rats. Rats receiving tDCS experienced enhanced synaptic plasticity without detectable improvement in behavioral tests or significant changes in astrocyte activation. The tDCS-mediated reduction in inflammatory cytokine levels supports the potential use of tDCS as a countermeasure against inflammation and offers additional support for the hypothesis that cytokines contribute to the modulation of synaptic plasticity.
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Affiliation(s)
- Victoria T. Ethridge
- Naval Medical Research Unit Dayton (NAMRU-D), Wright-Patterson Air Force Base, Dayton, OH, United States,Odyssey Systems Consulting Group, Wakefield, MA, United States,Leidos, Reston, VA, United States
| | - Nathan M. Gargas
- Naval Medical Research Unit Dayton (NAMRU-D), Wright-Patterson Air Force Base, Dayton, OH, United States,Odyssey Systems Consulting Group, Wakefield, MA, United States,Leidos, Reston, VA, United States
| | - Martha J. Sonner
- Naval Medical Research Unit Dayton (NAMRU-D), Wright-Patterson Air Force Base, Dayton, OH, United States,Leidos, Reston, VA, United States,ICON, Hinckley, OH, United States
| | - Raquel J. Moore
- Infoscitex, Dayton, OH, United States,711th HPW/RHBCN, Wright-Patterson Air Force Base, Dayton, OH, United States
| | - Shannon H. Romer
- Naval Medical Research Unit Dayton (NAMRU-D), Wright-Patterson Air Force Base, Dayton, OH, United States,Odyssey Systems Consulting Group, Wakefield, MA, United States,Leidos, Reston, VA, United States
| | | | - Joyce G. Rohan
- Naval Medical Research Unit Dayton (NAMRU-D), Wright-Patterson Air Force Base, Dayton, OH, United States,*Correspondence: Joyce G. Rohan,
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Santos DS, Stein DJ, Medeiros HR, Dos Santos Pereira F, de Macedo IC, Fregni F, Caumo W, Torres ILS. Transcranial direct current stimulation alters anxious-like behavior and neural parameters in rats with chronic pain exposed to alcohol. J Psychiatr Res 2021; 144:369-377. [PMID: 34735841 DOI: 10.1016/j.jpsychires.2021.10.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 10/04/2021] [Accepted: 10/25/2021] [Indexed: 11/27/2022]
Abstract
The aim of this study was to evaluate the effects of transcranial direct current stimulation (tDCS) on anxiety-like behavior and neural parameters in rats with chronic pain exposed to alcohol. Thirty-six adult male Wistar rats were randomly assigned to control (CT), neuropathic pain (NP), NPtDCS, NP + alcohol (NPAL), or NPALtDCS groups, subjected to sciatic nerve chronic constriction injury (CCI) and exposed to alcohol (20% v/v solution, 4 g/kg) or vehicle by gavage for 15 days. Afterward, rats were treated using bimodal tDCS (0.5 mA/20 min/8 days) and tested in the open field. Rats were killed 24 h after the last behavioral assessment, and brain and spinal cord tissue samples were collected and processed for NPY immunohistochemistry, expression of Il1a and Il1b in the spinal cord, cerebellum, and hippocampus, and levels of IL-1α and IL-1β in the same brain structures and the striatum. tDCS reverted the anxiety-like behavior induced by CCI and alcohol, and the increased expression of Il1a in the spinal cord induced by alcohol, which increased the expression of Il1b in the cerebellum. In addition, tDCS modulated the hypothalamic NPY-immunoreactivity, increased the levels of IL-1α in the hippocampus (like NP and AL), and increased the expression of Il1b in the spinal cord (like AL). Thus, this study shows that tDCS changes NP and alcohol-induced anxiety-like behavior, possibly through its central modulatory effect of NPY and spinal cord expression of Il1a and Il1b, being considered a treatment option for alcohol and NP-induced anxiety symptoms.
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Affiliation(s)
- Daniela Silva Santos
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Investigations, Center of Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, 90035-007, Brazil; Postgraduate Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Dirson João Stein
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Investigations, Center of Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, 90035-007, Brazil; Postgraduate Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Helouise Richardt Medeiros
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Investigations, Center of Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, 90035-007, Brazil; Postgraduate Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Fernanda Dos Santos Pereira
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Investigations, Center of Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, 90035-007, Brazil
| | - Isabel Cristina de Macedo
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Investigations, Center of Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, 90035-007, Brazil; Universidade Federal do Pampa, Uruguaiana, RS, Brazil
| | - Felipe Fregni
- Laboratory of Neuromodulation, Department of Physical Medicine & Rehabilitation, Spaulding Rehabilitation Hospital and Massachusetts General Hospital, Harvard University, Boston, MA, USA
| | - Wolnei Caumo
- Postgraduate Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Iraci L S Torres
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Investigations, Center of Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, 90035-007, Brazil; Postgraduate Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
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7
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de Castro JM, Stein DJ, Medeiros HR, de Oliveira C, Torres ILS. Nicotinamide Riboside Neutralizes Hypothalamic Inflammation and Increases Weight Loss Without Altering Muscle Mass in Obese Rats Under Calorie Restriction: A Preliminary Investigation. Front Nutr 2021; 8:648893. [PMID: 34589508 PMCID: PMC8475757 DOI: 10.3389/fnut.2021.648893] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Accepted: 08/12/2021] [Indexed: 01/13/2023] Open
Abstract
Obesity treatments, such as calorie restriction (CR), eventually lead to muscle wasting and higher rates of neuroinflammation, whereas hypothalamic inflammatory conditions impair body weight (BW) control. Nicotinamide riboside (NR) has been proposed against obesity but with little evidence on skeletal muscle tissue (SMT) and neuroinflammation. Therefore, we aimed to investigate the effects of CR on SMT and on hypothalamic inflammatory biomarkers in obese adult male Wistar rats, and whether NR supplementation alone or in combination with CR affects these parameters. Obesity was induced in rats through a cafeteria diet for 6 weeks. After that, a group of obese rats was exposed to CR, associated or not associated with NR supplementation (400 mg/kg), for another 4 weeks. As a result, obese rats, with or without CR, presented lower relative weight of SMT when compared with eutrophic rats. Rats under CR presented lower absolute SMT weight compared with obese and eutrophic rats, in addition to presenting elevated hypothalamic levels of TNF-α. NR supplementation, in all groups, enhanced weight loss and increased relative weight of the SMT. Furthermore, in animals under CR, NR reversed increases TNF-α levels in the hypothalamus. In this study, these data, although succinct, are the first to evidence the effects of NR on SMT and neuroinflammation when associated with CR, especially in obesity conditions. Therefore, this provides preliminary support for future studies in this investigative field. Furthermore, NR emerges as a potential adjuvant for preventing muscle mass loss in the weight loss processes.
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Affiliation(s)
- Josimar Macedo de Castro
- Postgraduate Program in Medicine: Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Studies, Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.,Animal Experimentation Unit, Grupo de Pesquisa e Pós-Graduação, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Dirson João Stein
- Postgraduate Program in Medicine: Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Studies, Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.,Animal Experimentation Unit, Grupo de Pesquisa e Pós-Graduação, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Helouise Richardt Medeiros
- Postgraduate Program in Medicine: Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Studies, Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.,Animal Experimentation Unit, Grupo de Pesquisa e Pós-Graduação, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | | | - Iraci L S Torres
- Postgraduate Program in Medicine: Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Studies, Experimental Research Center, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.,Animal Experimentation Unit, Grupo de Pesquisa e Pós-Graduação, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
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Longo L, de Souza VEG, Stein DJ, de Freitas JS, Uribe-Cruz C, Torres ILS, Álvares-da-Silva MR. Transcranial direct current stimulation (tDCS) has beneficial effects on liver lipid accumulation and hepatic inflammatory parameters in obese rats. Sci Rep 2021; 11:11037. [PMID: 34040131 PMCID: PMC8154948 DOI: 10.1038/s41598-021-90563-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Accepted: 05/04/2021] [Indexed: 02/04/2023] Open
Abstract
Obesity is key to liver steatosis development and progression. Transcranial direct current stimulation (tDCS) is a promising tool for eating disorders management but was not yet evaluated in steatosis. This study investigated tDCS' effects on liver steatosis and inflammation in an experimental obesity model. Male Wistar rats (60 days-old) were randomly allocated (n = 10/group) as follows: standard-diet/sham tDCS (SDS), standard-diet/tDCS (SDT), hypercaloric-cafeteria-diet/sham tDCS (HDS), and hypercaloric-cafeteria-diet/tDCS (HDT). After 40 days of diet, animals received active or sham tDCS for eight days and were euthanized for liver fat deposition and inflammation analysis. HDS and HDT animals showed cumulative food consumption, total liver lipid deposits, IL-1β, TNF-α levels, IL-1β/IL-10 and TNF-α/IL-10 ratios significantly higher than the SDS and SDT groups (p < 0.001 for all parameters). tDCS (SDT and HDT) reduced liver lipid deposits (0.7 times for both, p < 0.05), IL-1β (0.7 times and 0.9 times, respectively, p < 0.05) and IL-1β/IL-10 index (0.6 times and 0.8 times, respectively, p < 0.05) in relation to sham (SDS and HDS). There was an interaction effect on the accumulation of hepatic triglycerides (p < 0.05). tDCS reduced 0.8 times the average liver triglyceride concentration in the HDT vs. HDS group (p < 0.05). In this obesity model, tDCS significantly decreased liver steatosis and hepatic inflammation. These results may justify looking into tDCS utility for human steatosis.
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Affiliation(s)
- Larisse Longo
- Graduate Program in Gastroenterology and Hepatology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
- Experimental Laboratory of Hepatology and Gastroenterology, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.
| | - Valessa Emanoele Gabriel de Souza
- Experimental Laboratory of Hepatology and Gastroenterology, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Dirson João Stein
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Investigations, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
- Graduate Program in Medicine: Medical Sciences, Universidade Federal Rio Grande do Sul, Porto Alegre, Brazil
| | - Joice Soares de Freitas
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Investigations, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Carolina Uribe-Cruz
- Graduate Program in Gastroenterology and Hepatology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Experimental Laboratory of Hepatology and Gastroenterology, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Iraci L S Torres
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Investigations, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
- Graduate Program in Medicine: Medical Sciences, Universidade Federal Rio Grande do Sul, Porto Alegre, Brazil
- Graduate Program in Biological Sciences, Pharmacology and Therapeutics, Universidade Federal Rio Grande do Sul, Porto Alegre, Brazil
| | - Mário Reis Álvares-da-Silva
- Graduate Program in Gastroenterology and Hepatology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Experimental Laboratory of Hepatology and Gastroenterology, Center for Experimental Research, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
- Division of Gastroenterology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
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de Castro JM, Assumpção JAF, Stein DJ, Toledo RS, da Silva LS, Caumo W, Carraro CC, da Rosa Araujo AS, Torres ILS. Nicotinamide riboside reduces cardiometabolic risk factors and modulates cardiac oxidative stress in obese Wistar rats under caloric restriction. Life Sci 2020; 263:118596. [PMID: 33080243 DOI: 10.1016/j.lfs.2020.118596] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 09/30/2020] [Accepted: 10/08/2020] [Indexed: 12/15/2022]
Abstract
AIMS NAD-based therapeutic strategies are encouraged against obesity and heart disease. Our study, therefore, aimed to investigate the effects of nicotinamide riboside (NR), isolated or combined with caloric restriction (CR), both approaches well-known for stimulating NAD levels, on adiposity parameters, cardiometabolic factors and cardiac oxidative stress in rats submitted to cafeteria diet (CAF). MAIN METHODS After 42 days of CAF-induced obesity (hypercaloric and ultra-processed foods common to humans), we examined the effects of oral administration of NR (400 mg/kg for 28 days), combined or not with CR (-62% kcal, for 28 days), on anthropometric, metabolic, tissue, and cardiac oxidative stress parameters in obese male Wistar rats. KEY FINDINGS In obese rats, treatment with NR alone mitigated final body weight gain, reduced adiposity (visceral and subcutaneous), improved insulin resistance, and decreased TG/HDL ratio and heart size. In cardiac OS, treatment with NR increased the antioxidant capacity via glutathione peroxidase and catalase enzymes (in rats under CR) as well as reduced the pro-oxidant complex NADPH oxidase (in obese and lean rats). Hyperglycemia, hypertriglyceridemia and elevated levels of TBARS in the heart were state-dependent adverse effects, induced by treatment with NR. SIGNIFICANCE This is the first study to report effects of nicotinamide riboside on cardiac oxidative stress in an obesity model. Nicotinamide riboside, a natural dietary compound, presented antiobesity effects and cardiometabolic benefits, in addition to positively modulating oxidative stress in the heart, in a state-dependent manner.
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Affiliation(s)
- Josimar Macedo de Castro
- Programa de Pós-Graduação em Ciências Biológicas (PPG): Farmacologia e Terapêutica - Instituto de Ciências Básicas da Saúde (ICBS) - Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil
| | - José Antônio Fagundes Assumpção
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Faculdade de Medicina - UFRGS, Porto Alegre, RS, Brazil
| | - Dirson João Stein
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Faculdade de Medicina - UFRGS, Porto Alegre, RS, Brazil
| | - Roberta Ströher Toledo
- Programa de Pós-Graduação em Ciências Biológicas (PPG): Farmacologia e Terapêutica - Instituto de Ciências Básicas da Saúde (ICBS) - Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil
| | - Lisiane Santos da Silva
- Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Faculdade de Medicina - UFRGS, Porto Alegre, RS, Brazil
| | - Wolnei Caumo
- Programa de Pós-Graduação em Medicina: Ciências Médicas - Faculdade de Medicina - UFRGS, Porto Alegre, RS, Brazil
| | - Cristina Campos Carraro
- Laboratório de Fisiologia Cardiovascular e Espécies Reativas de Oxigênio, Departamento de Fisiologia - ICBS - UFRGS, Porto Alegre, RS, Brazil
| | - Alex Sander da Rosa Araujo
- Laboratório de Fisiologia Cardiovascular e Espécies Reativas de Oxigênio, Departamento de Fisiologia - ICBS - UFRGS, Porto Alegre, RS, Brazil
| | - Iraci L S Torres
- Programa de Pós-Graduação em Ciências Biológicas (PPG): Farmacologia e Terapêutica - Instituto de Ciências Básicas da Saúde (ICBS) - Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratório de Farmacologia da Dor e Neuromodulação: Investigações Pré-clínicas - Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil; Programa de Pós-Graduação em Medicina: Ciências Médicas - Faculdade de Medicina - UFRGS, Porto Alegre, RS, Brazil.
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Lalanza JF, Snoeren EMS. The cafeteria diet: A standardized protocol and its effects on behavior. Neurosci Biobehav Rev 2020; 122:92-119. [PMID: 33309818 DOI: 10.1016/j.neubiorev.2020.11.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 11/03/2020] [Accepted: 11/04/2020] [Indexed: 12/13/2022]
Abstract
Obesity is a major health risk, with junk food consumption playing a central role in weight gain, because of its high palatability and high-energy nutrients. The Cafeteria (CAF) diet model for animal experiments consists of the same tasty but unhealthy food products that people eat (e.g. hot dogs and muffins), and considers variety, novelty and secondary food features, such as smell and texture. This model, therefore, mimics human eating patterns better than other models. In this paper, we systematically review studies that have used a CAF diet in behavioral experiments and propose a standardized CAF diet protocol. The proposed diet is ad libitum and voluntary; combines different textures, nutrients and tastes, including salty and sweet products; and it is rotated and varied. Our summary of the behavioral effects of CAF diet show that it alters meal patterns, reduces the hedonic value of other rewards, and tends to reduce stress and spatial memory. So far, no clear effects of CAF diet were found on locomotor activity, impulsivity, coping and social behavior.
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Affiliation(s)
- Jaume F Lalanza
- Department of Psychology, UiT The Arctic University of Norway, Tromsø, Norway.
| | - Eelke M S Snoeren
- Department of Psychology, UiT The Arctic University of Norway, Tromsø, Norway; Regional Health Authority of North Norway, Norway.
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Transcranial Direct Current Stimulation (tDCS) Induces Analgesia in Rats with Neuropathic Pain and Alcohol Abstinence. Neurochem Res 2020; 45:2653-2663. [DOI: 10.1007/s11064-020-03116-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 07/31/2020] [Accepted: 08/15/2020] [Indexed: 02/07/2023]
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Guo T, Fang J, Tong ZY, He S, Luo Y. Transcranial Direct Current Stimulation Ameliorates Cognitive Impairment via Modulating Oxidative Stress, Inflammation, and Autophagy in a Rat Model of Vascular Dementia. Front Neurosci 2020; 14:28. [PMID: 32063834 PMCID: PMC7000631 DOI: 10.3389/fnins.2020.00028] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 01/10/2020] [Indexed: 12/11/2022] Open
Abstract
To investigate the potential applications and the molecular mechanisms of transcranial direct current stimulation (tDCS) on cognitive impairment in a vascular dementia (VD) animal model. Sprague-Dawley rats were used in this study. VD rat model was induced by modified permanent bilateral common carotid artery occlusion (2-VO) approach. Anodal tDCS was applied to the animals. Morris water maze was used to analyze spatial memory and navigation ability. The pathological changes in the hippocampal CA1 region and cerebral cortex were examined via Hematoxylin-Eosin staining. The rats were sacrificed for the measurement of the level of superoxide (SOD), glutathione (GSH), reactive oxidative species (ROS), malondialdehyd (MDA), Interleukin (IL)-1β, IL-6, and tumor necrosis factor (TNF)-α level in the hippocampus. Western blot was carried out to measure the hippocampal expression of microtubule-associated protein 1 light chain 3 (LC-3) and p62. Rats with VD have decreased number of neurons in the hippocampus and cerebral cortex, as well as worse cognitive impairment. The proliferation of activated microglia and astroglia, accompanied with attenuation of myelination were observed in the white matter about 1 month after 2-VO operation. These abnormalities were significantly ameliorated by tDCS treatment. Further study revealed that anodal tDCS could suppress the MDA and ROS level, while enhance the SOD and GSH level to reduce the oxidative stress. Anodal tDCS could inhibit hypoperfusion-induced IL-1β, IL-6, and TNF-α expression to attenuate inflammatory response in hippocampus. Moreover, anodal tDCS treatment could alleviate autophagy level. The study has demonstrated a possible therapeutic role of tDCS in the treatment of cognitive impairment in VD.
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Affiliation(s)
- Tao Guo
- Department of Emergency, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Jia Fang
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Zhong Y Tong
- Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Shasha He
- Department of Oncology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Yingying Luo
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha, China
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