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Aguilera A, Selgas R, Codoceo R, Bajo A. Uremic Anorexia: A Consequence of Persistently High Brain Serotonin Levels? The Tryptophan/Serotonin Disorder Hypothesis. Perit Dial Int 2020. [DOI: 10.1177/089686080002000648] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Anorexia is a frequent part of uremic syndrome, contributing to malnutrition in dialysis patients. Many factors have been suggested as responsible for uremic anorexia.In this paper we formulate a new hypothesis to explain the appetite disorders in dialysis patients: “the tryptophan/serotonin disorder hypothesis.” We review current knowledge of normal hunger–satiety cycle control and the disorders described in uremic patients. There are four phases in food intake regulation: ( 1 ) the gastric phase, during which food induces satiety through gastric distention and satiety peptide release; ( 2 ) the post absorptive phase, during which circulating compounds, including glucose and amino acids, cause satiety by hepatic receptors via the vagus nerve; ( 3 ) the hepatic phase, during which adenosine triphosphate (ATP) concentration is the main stimulus inducing hunger or satiety, with cytokines inhibiting ATP production; and ( 4 ) the central phase, during which appetite is regulated through peripheral (circulating plasma substances and neurotransmitters) and brain stimuli. Brain serotonin is the final target for peripheral mechanisms controlling appetite. High brain serotonin levels and a lower serotonin/ dopamine ratio cause anorexia. Plasma and brain amino acid concentrations are recognized factors involved in neurotransmitter synthesis and appetite control. Tryptophan is the substrate of serotonin synthesis. High plasma levels of anorectics such as tryptophan (plasma and brain), cholecystokinin, tumor necrosis factor alpha, interleukin-1, and leptin, and deficiencies of nitric oxide and neuropeptide Y have been described in uremia; all increase intracerebral serotonin.We suggest that brain serotonin hyperproduction due to a uremic-dependent excess of tryptophan may be the final common pathway involved in the genesis of uremic anorexia. Various methods of ameliorating anorexia by decreasing the central effects of serotonin are proposed.
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Affiliation(s)
| | | | - Rosa Codoceo
- Servicio de Nefrologia and Laboratorio de Gastroenterologia, Madrid, Spain
| | - Auxiliadora Bajo
- Hospitales Universitarios de la Princesa y La Paz, Madrid, Spain
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Zou Y, Li S, Wu D, Xu Y, Wang S, Jiang Y, Liu F, Jiang Z, Qu H, Yu X, Wang X, Wang Y, Sun L. Resveratrol promotes trophoblast invasion in pre-eclampsia by inducing epithelial-mesenchymal transition. J Cell Mol Med 2019; 23:2702-2710. [PMID: 30710417 PMCID: PMC6433653 DOI: 10.1111/jcmm.14175] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 11/13/2018] [Accepted: 12/28/2018] [Indexed: 12/25/2022] Open
Abstract
Impairment spiral arteries remodelling was considered to be the underlying cause of pathogenesis of pre‐eclampsia (PE). Resveratrol (RE) was reported that it could modulate cellar phenotype to ameliorate diverse human diseases. However, the biological function of RE in PE remains poorly understood. In this report, we investigated the effect of RE on trophoblast phenotype both in vivo and in vitro. We conducted MTT and transwell assays to explore cell proliferation and invasion events in HTR‐8/SVneo. In mice model, the clinical characteristics of PE were established through the injection of NG‐nitro‐l‐arginine methyl ester (L‐NAME). Furthermore, related experiments were performed to detect cellar phenotype‐associated signalling pathway, including epithelial‐mesenchymal transition (EMT) and Wnt/β‐catenin. Cell assays indicated that RE could increase trophoblasts migration and invasion. In addition, hypertension and proteinuria were markedly ameliorated by RE compared with the controls in PE mice model. Moreover, treatment by RE in trophoblasts or in PE model, we found that RE activated EMT progress through the regulation of E‐cadherin, β‐catenin, N‐cadherin, vimentin expression, and further altered the WNT‐related gene expression, including WNT1, WNT3 and WNT5B. Our findings demonstrated that RE might stimulate the invasive capability of human trophoblasts by promoting EMT and mediating the Wnt/β‐catenin pathway in PE.
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Affiliation(s)
- Yanfen Zou
- Department of Obstetrics and Gynecology, Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong Province, China
| | - Shuhong Li
- Department of Obstetrics and Gynecology, Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong Province, China
| | - Dan Wu
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Yetao Xu
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China.,Department of Obstetrics, Gynecology & Reproductive Sciences, Yale Stem Cell Center, Yale University School of Medicine, New Haven, Connecticut
| | - Sailan Wang
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Ying Jiang
- Department of Obstetrics, Gynecology & Reproductive Sciences, Yale Stem Cell Center, Yale University School of Medicine, New Haven, Connecticut.,Department of Obstetrics, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
| | - Fang Liu
- Department of Cardiology, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Ziyan Jiang
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Hongmei Qu
- Department of Obstetrics and Gynecology, Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong Province, China
| | - Xiang Yu
- Department of General Surgery, Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong Province, China
| | - Xiaoli Wang
- Department of Obstetrics and Gynecology, Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong Province, China
| | - Yuanli Wang
- Department of Obstetrics and Gynecology, Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong Province, China
| | - Lizhou Sun
- Department of Obstetrics and Gynecology, First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
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Prezotto LD, Thorson JF, Borowicz PP, Peine JL, Bedenbaugh M, Hileman SM, Lents CA, Caton JS, Swanson KC. Influences of maternal nutrient restriction and arginine supplementation on visceral metabolism and hypothalamic circuitry of offspring. Domest Anim Endocrinol 2018; 65:71-79. [PMID: 30007131 DOI: 10.1016/j.domaniend.2018.06.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 04/23/2018] [Accepted: 06/13/2018] [Indexed: 11/17/2022]
Abstract
Maternal nutrient restriction during gestation can exert long-term negative effects on offspring health and performance. Arginine supplementation may rescue some of the negative effects elicited by maternal nutrient restriction. We tested the hypothesis that maternal arginine supplementation during gestation would rescue deleterious effects of nutrient restriction on in vitro O2 consumption in the liver and jejunum and hypothalamic protein expression of proopiomelanocortin (POMC), neuropeptide Y (NPY), agouti-related peptide (AgRP), and neuronal nitric oxide synthase (nNOS), and the colocalization of nNOS and active phosphor-signal transducer and activator of transcription 3 (pSTAT3) in female offspring. Multiparous ewes were assigned to dietary treatment at 54 d of gestation: 100% of requirements (Con), 60% of control (Res), or Res plus rumen-protected arginine (Res-Arg; 180 mg/kg). At parturition, offspring were immediately removed from their dam and placed on a common diet. At 54 ± 4 d of age, female lambs (n = 6 per treatment) were weighed, the liver and jejunum were weighed, and samples were collected for in vitro measurement of O2 consumption. The hypothalamus was collected to determine protein expression of POMC, NPY, AgRP, and nNOS, and the colocalization of nNOS and pSTAT3 (n = 3, 4, and 4 for Con, Res, and Res-Arg, respectively). Hepatic consumption of O2 in vitro (mol/min/liver) was decreased (P = 0.04) in the Res and Res-Arg group compared with Con. Intensity of staining for NPY-containing fibers tended to decrease (P = 0.10) in Res and Res-Arg compared with Con. Number of POMC neuronal cells in the arcuate nucleus (ARC) of the hypothalamus decreased (P ≤ 0.03) in the Res group compared with Res-Arg. These observations demonstrate that maternal nutrient restriction decreases energy utilization in the liver and number of POMC cells in the ARC of offspring. Supplementation of arginine to the gestating ewe failed to influence hepatic use of energy in lambs from Res ewes. Numbers of POMC-containing cells were increased in the ARC in lambs from ewes restricted to 60% of nutritional requirements and supplemented with rumen-protected arginine, potentially influencing feeding behavior and hepatic energy metabolism.
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Affiliation(s)
- Ligia D Prezotto
- Department of Animal Sciences, North Dakota State University, Hultz Hall 166, Dept. 7630, PO Box 6050, Fargo 58108, USA; Northern Agricultural Research Center, Montana State University, 3710 Assinniboine Road, Havre 59501, USA
| | - Jennifer F Thorson
- Northern Agricultural Research Center, Montana State University, 3710 Assinniboine Road, Havre 59501, USA; USDA, ARS, U.S. Meat Animal Research Center, P.O. Box 166, Clay Center 68933, USA
| | - Pawel P Borowicz
- Department of Animal Sciences, North Dakota State University, Hultz Hall 166, Dept. 7630, PO Box 6050, Fargo 58108, USA
| | - Jena L Peine
- Department of Animal Sciences, North Dakota State University, Hultz Hall 166, Dept. 7630, PO Box 6050, Fargo 58108, USA
| | - Michelle Bedenbaugh
- Department of Physiology & Pharmacology, West Virginia University, Morgantown, WV 26506, USA
| | - Stanley M Hileman
- Department of Physiology & Pharmacology, West Virginia University, Morgantown, WV 26506, USA
| | - Clay A Lents
- USDA, ARS, U.S. Meat Animal Research Center, P.O. Box 166, Clay Center 68933, USA
| | - Joel S Caton
- Department of Animal Sciences, North Dakota State University, Hultz Hall 166, Dept. 7630, PO Box 6050, Fargo 58108, USA
| | - Kendall C Swanson
- Department of Animal Sciences, North Dakota State University, Hultz Hall 166, Dept. 7630, PO Box 6050, Fargo 58108, USA.
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Barnidipine ameliorates the vascular and renal injury in l-NAME-induced hypertensive rats. Eur J Pharmacol 2015; 764:433-442. [DOI: 10.1016/j.ejphar.2015.07.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 07/07/2015] [Accepted: 07/13/2015] [Indexed: 01/25/2023]
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Iuras A, Telles MM, Andrade IS, Santos GMS, Oyama LM, Nascimento CMO, Silveira VLF, Ribeiro EB. L-arginine abolishes the hypothalamic serotonergic activation induced by central interleukin-1β administration to normal rats. J Neuroinflammation 2013; 10:147. [PMID: 24314273 PMCID: PMC3866599 DOI: 10.1186/1742-2094-10-147] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Accepted: 11/22/2013] [Indexed: 11/10/2022] Open
Abstract
IL-1β-induced anorexia may depend on interactions of the cytokine with neuropeptides and neurotransmitters of the central nervous system control of energy balance and serotonin is likely to be one catabolic mediator targeted by IL-1β. In the complex interplay involved in feeding modulation, nitric oxide has been ascribed a stimulatory action, which could be of significance in counteracting IL-1β effects. The present study aims to explore the participation of the nitric oxide and the serotonin systems on the central mechanisms induced by IL-1β and the relevance of their putative interactions to IL-1β hypophagia in normal rats. Serotonin levels were determined in microdialysates of the ventromedial hypothalamus after a single intracerebroventricular injection of 10 ng of IL-1β , with or without the pre-injection of 20 μg of the nitric oxide precursor L-arginine. IL-1β significantly stimulated hypothalamic serotonin extracellular levels, with a peak variation of 130 ±37% above baseline. IL- 1β also reduced the 4-h and the 24-h food intakes (by 23% and 58%, respectively). The IL-1β-induced serotonergic activation was abolished by the pre-injection of L-arginine while the hypophagic effect was unaffected. The data showed that one central effect of IL-1β is serotonergic stimulation in the ventromedial hypothalamus, an action inhibited by nitric oxide activity. It is suggested that, although serotonin participates in IL-1β anorexia, other mechanisms recruited by IL-1β in normal rats are able to override the absence of the serotonergic hypophagic influence.
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Affiliation(s)
| | | | | | | | | | | | | | - Eliane B Ribeiro
- Department of Physiology, Universidade Federal de São Paulo, Rua Botucatu, 862 - 2º andar - Vila Clementino, São Paulo, SP 04023-060, Brazil.
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Melo MPP, Vasconcelos ACDSE, Santos PCPD, Monteiro HMC, Santos ÂAD, Maia LMSDS, Evêncio LB. Interferência da L-arginina e do exercício físico sobre a morfologia do músculo estriado esquelético em ratos jovens. REV BRAS MED ESPORTE 2013. [DOI: 10.1590/s1517-86922013000400012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
INTRODUÇÃO: O exercício físico pode promover alterações anatomofisiológicas no músculo estriado esquelético e a ingestão do aminoácido L-arginina pode influenciar na morfometria da fibra muscular esquelética. OBJETIVO: Analisar a influência da L-arginina associada ao exercício físico sobre a fibra muscular esquelética. MÉTODOS: Foram utilizados 24 ratos da linhagem Wistar. Aos sete dias de vida, esses animais foram divididos em dois grupos: tratados com L-arginina (grupo-Ar; 300 mg/kg/dia) e tratados com volume equivalente do veículo - água destilada (grupo-Ag; controle). A L-arginina ou a água foi administrada diariamente por gavagem. Aos 15 dias de idade, os animais dos grupos Ar e Ag foram subdivididos de acordo com a condição de exercício físico a que foram submetidos: exercitados em esteira (grupo E) e não exercitado (grupo N). O exercício foi realizado em esteira (ET 2000 Insight) cinco dias por semana com duração diária de 30 minutos. Os grupos foram assim distribuídos (n = 6): AgN, AgE, ArN e ArE. Ao atingirem a idade de 35-45 dias de vida, os animais foram pesados, sacrificados e retidado o músculo gastrocnêmio. Este foi medido, pesado e processado para análise histológica. As imagens do músculo foram capturadas na objetiva de 100x para cálculo do diâmetro médio da fibra muscular. Os dados foram expressos na forma de média ± desvio padrão, analisados através do programa SPSS. Foram utilizados os testes de Shapiro-Wilk, ANOVA one way e teste de Tukey (p < 0,05). RESULTADOS: Não houve diferença entre os grupos, quanto ao peso corporal do animal e ao peso do músculo gastrocnêmio. No entanto, o grupo ArN apresentou diâmetro médio maior significativamente quando comparado aos dos demais grupos. CONCLUSÃO: Isto sugere que a L-arginina, em animais que não realizaram o exercício físico, promove hipertrofia muscular, enquanto que o exercício realizado não foi capaz de promover aumento do diâmetro da fibra muscular.
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Yang XJ, Liu JT. Synthesis of Fluoroalkylated Heterocycles via the Reaction of 3-(1-Hydropolyfluoroalkenyl)-1-oxo-2,4,1-benzoxazines with Dinucleophilic Reagents. CHINESE J CHEM 2006. [DOI: 10.1002/cjoc.200690265] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Iuras A, Telles MM, Bertoncini CRA, Ko GM, de Andrade IS, Silveira VLF, Ribeiro EB. Central administration of a nitric oxide precursor abolishes both the hypothalamic serotonin release and the hypophagia induced by interleukin-1beta in obese Zucker rats. ACTA ACUST UNITED AC 2005; 124:145-50. [PMID: 15544852 DOI: 10.1016/j.regpep.2004.07.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2004] [Accepted: 07/02/2004] [Indexed: 01/23/2023]
Abstract
Serotonin-induced anorexia has long been recognized as an important part of the CNS mechanisms controlling energy balance. More recently, interleukin-1beta and nitric oxide have been suggested to influence this control, possibly through modulation of hypothalamic serotonin. The present work aimed at investigating the interaction of these systems. We addressed whether 5-HT is affected during IL-1beta-induced anorexia in obese Zucker rats and the influence of the central NO system on this IL-1beta/5-HT interaction. Using microdialysis, we observed that an intracerebroventricular injection of 10 ng IL-1beta significantly stimulated 5-HT extracellular levels in the VMH, with a peak variation of 102+/-41% above baseline. IL-1beta also significantly reduced the 4-h feeding by 33% and the 24-h feeding by 42%. Contrarily, these effects were absent when IL-1beta was injected 2 h after the i.c.v. administration of 20 microg of the NO precursor L-arginine. The results suggest that, in obese Zucker rats, activation of the serotonergic system in the medial hypothalamus participates in IL-1beta-induced anorexia. Since L-arginine, probably through NO stimulation, abolished both the anorexia and the serotonergic activation, it can be proposed that the NO system, either directly or indirectly, counteracts IL-1beta anorexia. The hypothalamic serotonergic system is likely to mediate this NO effect.
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Affiliation(s)
- Anderson Iuras
- Department of Physiology, Federal University of São Paulo, Rua Botucatu, 862-2 Andar, Vila Clementino, São Paulo, SP 04023-060, Brazil
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Inan SY, Yalcin I, Aksu F. Dual effects of nitric oxide in the mouse forced swimming test: possible contribution of nitric oxide-mediated serotonin release and potassium channel modulation. Pharmacol Biochem Behav 2004; 77:457-64. [PMID: 15006455 DOI: 10.1016/j.pbb.2003.12.024] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2003] [Revised: 08/24/2003] [Accepted: 12/04/2003] [Indexed: 11/30/2022]
Abstract
Recent findings have indicated that nitric oxide (NO) may change the duration of immobility biphasically in the forced swimming test, which is a useful experimental model for screening antidepressant-like activity in rodents. In the present study, we have investigated the role of serotonin and of potassium (K(+)) channels in the dual effects of NO in the mouse forced swimming test (MFST). For this purpose, we tested the effects of l-arginine, an NO precursor, the NO synthase inhibitor N(G)-nitro-l-arginine methyl ester (l-NAME), and of K(+)-channel blockers tetraethylammonium (TEA) and 3,4-diaminopyridine (3,4-DAP). In addition, we used sertraline as a serotonin reuptake inhibitor and cyproheptadine as a serotonin antagonist. l-Arginine increased the duration of immobility in the MFST in low doses (25 mg/kg ip) but decreased it in higher doses (500 and 1000 mg/kg ip). Low doses of l-NAME (50 and 75 microg icv) decreased while higher dose of this drug (150 microg icv) increased the immobility time. TEA (5 microg icv) and 3,4-DAP (0.05 microg icv) significantly reduced the time, whereas K(+) channel opener pinacidil increased the duration of immobility. l-Arginine (100 mg/kg ip) significantly antagonised the effects of l-NAME (50 microg), 3,4-DAP and TEA. Higher dose of l-arginine (500 mg/kg ip) significantly potentiated the effects of 3,4-DAP and TEA, but reduced the effect of pinacidil. Low doses of l-arginine antagonized, but higher doses of l-arginine potentiated the antidepressant-like effect of sertraline. Sertraline potentiated the effects of 3,4-DAP and TEA, but reversed the effect of pinacidil. Cyproheptadine reduced the anti-immobility effect of l-arginine and 3,4-DAP. At the highest effective doses, drugs did not impair the motor functions. These data support the hypothesis that NO effects may involve the release of serotonin and/or modulation of K(+) channels.
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Affiliation(s)
- Salim Yalcin Inan
- Department of Pharmacology, Faculty of Medicine, Cukurova University, TR-01330, Balcali, Adana, Turkey
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Czech DA, Kazel MR, Harris J. A nitric oxide synthase inhibitor, N(G)-nitro-L-arginine methyl ester, attenuates lipoprivic feeding in mice. Physiol Behav 2003; 80:75-9. [PMID: 14568310 DOI: 10.1016/s0031-9384(03)00220-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Possible involvement of nitric oxide (NO) in lipoprivic feeding was investigated in nondeprived male ICR mice adapted to a high-fat diet in a within-subjects design. Lipoprivation was induced by blocking fatty acid oxidation with Na-mercaptoacetate (MA), which produces a short-term increase in feeding in mice and rats. Food intake, measured at 1, 2, and 4 h following injection of 70 mg/kg of MA, was attenuated in a dose related manner with increasing pretreatment dose (1,10, 25 and 50 mg/kg sc) of the NO-synthase (NOS) inhibitor, N(G)-nitro-L-arginine methyl ester (L-NAME), reaching statistical significance at 10 mg/kg of L-NAME at h1 when compared to vehicle control condition. The inactive isomer, D-NAME, was ineffective, thereby supporting stereospecific drug action and directly implicating NO. A control experiment measured general locomotor activity (grid crossings and rears) in an open arena under 10-50 mg/kg of L-NAME in the same mice; both measures were significantly different from vehicle condition only at the highest dose. These findings support involvement of NO in lipoprivic hyperphagia; they are consistent with and extend research linking NO and ingestive behaviors through use of NOS inhibitors. Possible influences of confounds were discussed.
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Affiliation(s)
- Donald A Czech
- Biopsychology Laboratory, Department of Psychology, Marquette University, SC-454, P.O. Box 1881, Milwaukee, WI 53201-1881, USA.
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Peotta VA, Vasquez EC, Meyrelles SS. Cardiovascular neural reflexes in L-NAME-induced hypertension in mice. Hypertension 2001; 38:555-9. [PMID: 11566930 DOI: 10.1161/01.hyp.38.3.555] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The mouse is the most used animal for studying the genetic basis of cardiovascular diseases. However, the mechanisms of regulation of cardiovascular function in this animal are not yet well understood. The goal of this study was to evaluate the baroreflex, the Bezold-Jarisch cardiopulmonary reflex (BJR), and the chemoreflex in mice with hypertension induced by inhibition of NO using Nomega-nitro-L-arginine-methyl ester (L-NAME). Basal mean arterial pressure (MAP) measured under anesthesia (urethane, 1 mg/g IP) was significantly higher in L-NAME (400 microgram/g IP for 7 days)-treated (HT) mice (n=7) compared with vehicle-treated (NT; n=10) animals (126+/-9 versus 79+/-2 mm Hg) without differences in heart rate (HR). Baroreflex sensitivity, evaluated using phenylephrine (1 microgram/g IV) was enhanced in HT mice compared with NT mice (-9.8+/-1.4 versus -4.9+/-0.5 bpm/mm Hg). The BJR, induced by phenylbiguanide (40 ng/g IV), was significantly attenuated in HT animals (MAP, -13+/-5%; HR, -39+/-6%) compared with NT animals (MAP, -38+/-5%; HR, -66+/-2%). The chemoreflex, induced by potassium cyanide (0.26 microgram/g IV), was significantly attenuated in HT animals (MAP, +14+/-4%; HR, -8+/-2%) compared with NT animals (MAP, +29+/-4%; HR, -15+/-4%). As has been observed in rats, chronic inhibition of NO synthase in mice results in arterial hypertension. Enhancement of baroreflex sensitivity and attenuation of BJR and chemoreflex seem to be mainly caused by inhibition of NO synthesis because individual analyses did not show positive correlation between changes in these reflexes and MAP levels in the HT group.
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Affiliation(s)
- V A Peotta
- Physiological Sciences Graduate Program, Biomedical Center, Federal University of Espirito Santo, and Health Sciences College (Emescam), Vitoria, ES, Brazil
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Matsushita H, Takeuchi Y, Kawata M, Sawada T. Distribution of NADPH-Diaphorase-Positive Neurons in the Mouse Brain: Differences from Previous Findings in the Rat Brain and Comparison with the Distribution of Serotonergic Neurons. Acta Histochem Cytochem 2001. [DOI: 10.1267/ahc.34.235] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
| | | | - Mitsuhiro Kawata
- Department of Anatomy and Neurobiology, Kyoto Prefectural University of Medicine
| | - Tadashi Sawada
- Department of Pediatrics, Kyoto Second Red Cross Hospital
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Czech DA. A nitric oxide synthase inhibitor, L-NAME, attenuates saccharin drinking in a two-choice test in water-deprived rats. Physiol Behav 1999; 67:161-5. [PMID: 10477045 DOI: 10.1016/s0031-9384(98)00258-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The nitric oxide synthase (NOS) inhibitor N(G)-nitro-L-arginine methyl ester (L-NAME) [0 (veh)], 10, 25, and 50 mg/kg s.c.) was administered to water-deprived, saccharin-preferring, rats in a 30-min two-bottle choice test of 0.1% sodium saccharin and tap water in a within subjects design. Saccharin intake was selectively attenuated in a dose-related manner with increasing dose of L-NAME, reaching statistical significance at 25 and 50 mg/kg L-NAME when compared to vehicle control condition (p < 0.01). In contrast, water intake was not appreciably affected. Total fluid intake was attenuated as well. Neither saccharin nor water intake in a second group of animals was significantly affected by the inactive isomer, D-NAME, suggesting a stereospecific action. These data suggest that a taste factor might contribute to the well-documented hypophagic action of NOS inhibitors in a number of animal species. The possibility that such effect might be mediated through a serotonergic mechanism is considered.
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Affiliation(s)
- D A Czech
- Department of Psychology SC-454, Marquette University, Milwaukee, WI 53201-1881, USA
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Vozzo R, Wittert GA, Chapman IM, Fraser R, Hope PJ, Horowitz M, Alshaher MM, Kumar VB, Morley JE. Evidence that nitric oxide stimulates feeding in the marsupial Sminthopsis crassicaudata. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. PART C, PHARMACOLOGY, TOXICOLOGY & ENDOCRINOLOGY 1999; 123:145-51. [PMID: 10442823 DOI: 10.1016/s0742-8413(99)00022-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Nitric oxide (NO) synthase inhibitors reduce food intake in rodents and chickens, suggesting that NO may stimulate feeding. We used two competitive, non-selective inhibitors of NO synthase (NOS), (NG-monomethyl-L-arginine ester [L-NMMA] and NG-nitro-L-arginine methyl ester [L-NAME]), to evaluate the role of NO mechanisms in the control of food intake in a marsupial model previously used in studies of appetite regulation. Adult male Sminthopsis crassicaudata (n = 11-16, 15 +/- 0.3 g, mean +/- S.E.M.) received L-NMMA (50, 100, 200 and 1000 mg/kg), L-NAME (50, 100 and 200 mg/kg), L-arginine (L-arg) the precursor of NO (1000 and 2000 mg/kg), L-NAME (200 mg/kg) in combination with L-arg (2000 mg/kg), or saline (0.9%). All drugs were administered intraperitoneally after 24 h of food deprivation, after which food was immediately made available ad libitum. Food intake was measured 0, 0.5, 1, 2, 4 and 24 h after treatments. In addition, we studied the effect of acute L-NAME administration on hypothalamic, cortical, hepatic and cardiac NOS activity by quantifying citrulline production. L-NMMA (1000 mg/kg) and L-NAME (100 and 200 mg/kg) suppressed food intake by 25%, 21%, and 30%, respectively, over 24 h after treatments (P < 0.05). L-arg (1000 and 2000 mg/kg) by itself had no significant effect on food intake when compared with saline (P > 0.05). When administered in combination with L-NAME (200 mg/kg), L-arg (2000 mg/kg) reversed L-NAME induced suppression of appetite (P> 0.05). Furthermore, L-NAME (200 mg/kg) significantly decreased hypothalamic (P < 0.01), cortical (P < 0.01) and hepatic (P < 0.03) NOS activity. L-NAME had no effect on cardiac NOS activity (P> 0.05). These data show that peripheral administration of L-NAME has a significant central effect, particularly in brain areas involved in appetite regulation, and suggest in marsupials, as in other mammals and birds, that NO plays a role in the regulation of food intake.
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Affiliation(s)
- R Vozzo
- Department of Medicine, Royal Adelaide Hospital, Australia
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Vozzo R, Wittert GA, Horowitz M, Morley JE, Chapman IM. Effect of nitric oxide synthase inhibitors on short-term appetite and food intake in humans. Am J Physiol Regul Integr Comp Physiol 1999; 276:R1562-8. [PMID: 10362732 DOI: 10.1152/ajpregu.1999.276.6.r1562] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Animal studies suggest that nitric oxide (NO) may be a physiological regulator of appetite; NO synthase (NOS) inhibition suppresses food intake in rats, mice, and chickens. It is not known whether NO has any effect on appetite in humans. We have used NG-monomethyl-L-arginine (L-NMMA) and NG-nitro-L-arginine methyl ester (L-NAME), both competitive, nonselective inhibitors of NOS, in two separate studies to evaluate the role of NO in the short-term regulation of appetite in humans. In study I, 13 men (18-25 yr) underwent paired studies, in randomized, double-blind fashion, after an overnight fast. L-NMMA (4 mg. kg-1. h-1) or saline (0.9%) was infused intravenously at a rate of 40 ml/h for 1.5 h. In study II, eight men (18-26 yr) underwent three randomized, double-blind studies after an overnight fast. L-NAME (75 or 180 micrograms . kg-1. h-1) or saline (0.9%) was infused intravenously at a rate of 20 ml/h for 120 min. Hunger and fullness were measured using visual analog scales; blood pressure and heart rate were monitored, and 30 min before the end of the infusion, subjects were offered a cold buffet meal. Total caloric intake and the macronutrient composition of the meal were determined. Both L-NMMA (P = 0.052) and L-NAME (P < 0.05; both doses) decreased heart rate, L-NMMA increased diastolic blood pressure (P < 0.01), and L-NAME increased systolic blood pressure (P = 0.052). Neither drug had any effect on caloric intake or sensations of hunger or fullness. Despite having significant effects on cardiovascular function in the doses used, neither L-NMMA nor L-NAME had any effect on feeding, suggesting that NO does not affect short-term appetite or food intake in humans.
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Affiliation(s)
- R Vozzo
- University of Adelaide, Department of Medicine, Royal Adelaide Hospital, North Terrace, Adelaide, South Australia, Australia 5000
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Nelson RJ, Kriegsfeld LJ, Dawson VL, Dawson TM. Effects of nitric oxide on neuroendocrine function and behavior. Front Neuroendocrinol 1997; 18:463-91. [PMID: 9344634 DOI: 10.1006/frne.1997.0156] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Nitric oxide (NO) is an unusual chemical messenger. NO mediates blood vessel relaxation when produced by endothelial cells. When produced by macrophages, NO contributes to the cytotoxic function of these immune cells. NO also functions as a neurotransmitter and neuromodulator in the central and peripheral nervous systems. The effects on blood vessel tone and neuronal function form the basis for an important role of NO on neuroendocrine function and behavior. NO mediates hypothalamic portal blood flow and, thus, affects oxytocin and vasopression secretion; furthermore, NO mediates neuroendocrine function in the hypothalamic-pituitary-gonadal and hypothalamic-pituitary-adrenal axes. NO influences several motivated behaviors including sexual, aggressive, and ingestive behaviors. Learning and memory are also influenced by NO. Taken together, NO is emerging as an important chemical mediator of neuroendocrine function and behavior.
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Affiliation(s)
- R J Nelson
- Department of Psychology, Johns Hopkins University, Baltimore, Maryland 21218-2686, USA.
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