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Monosodium Glutamate

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https://www.readbyqxmd.com/read/29651428/effects-and-mechanisms-of-tastants-on-the-gustatory-salivary-reflex-in-human-minor-salivary-glands
#1
Shizuko Satoh-Kuriwada, Noriaki Shoji, Hiroyuki Miyake, Chiyo Watanabe, Takashi Sasano
The effects and mechanisms of tastes on labial minor salivary gland (LMSG) secretion were investigated in 59 healthy individuals. Stimulation with each of the five basic tastes (i.e., sweet, salty, sour, bitter, and umami) onto the tongue induced LMSG secretion in a dose-dependent manner. Umami and sour tastes evoked greater secretion than did the other tastes. A synergistic effect of umami on LMSG secretion was recognized: a much greater increase in secretion was observed by a mixed solution of monosodium glutamate and inosine 5'-monophosphate than by each separate stimulation...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29649467/monosodium-glutamate-ingestion-during-the-development-period-reduces-aggression-mediated-by-the-vagus-nerve-in-a-rat-model-of-attention-deficit-hyperactivity-disorder
#2
Ruriko Nishigaki, Yoshihiro Yokoyama, Yuko Shimizu, Ryosuke Marumoto, Sachiyo Misumi, Yoshitomo Ueda, Akimasa Ishida, Yasuyuki Shibuya, Hideki Hida
We used an umami substance, monosodium glutamate (MSG), as a simple stimulant to clarify the mechanism of the formation of emotional behavior. A 60 mM MSG solution was fed to spontaneously hypertensive rats (SHR), used as a model of attention-deficit hyperactivity disorder, from postnatal day 25 for 5 weeks kept in isolation. Emotional behaviors (anxiety and aggression) were then assessed by the open-field test, cylinder test and social interaction test. MSG ingestion during the developmental period resulted in a significant reduction in aggressive behavior but had few effects on anxiety-like behavior...
April 9, 2018: Brain Research
https://www.readbyqxmd.com/read/29644544/toxicity-of-flavor-enhancers-to-the-oriental-fruit-fly-bactrocera-dorsalis-hendel-diptera-tephritidae
#3
Chunyan Zheng, Dongyu Yang, Zhiqiang Li, Yijuan Xu
The objective of this study was to evaluate the toxicity of flavor enhancers to the oriental fruit fly Bactrocera dorsalis (Hendel). The flavor enhancers glycine, disodium guanylate, succinic acid disodium salt, monosodium glutamate (MSG), disodium inosinate, and L-alanine significantly increased the mortality of B. dorsalis flies. The mortality of flies that fed on glycine, disodium guanylate, succinic acid disodium salt, and MSG was greater than 90%. Additionally, fruit fly mortality increased with increases in both time and concentration...
April 11, 2018: Ecotoxicology
https://www.readbyqxmd.com/read/29625349/dietary-correlates-of-chronic-widespread-pain-in-meru-kenya
#4
Kathleen F Holton, Peter K Ndege, Daniel J Clauw
OBJECTIVE: To gather preliminary data examining whether dehydration and/or exposure to monosodium glutamate (MSG) may influence pain in Meru, Kenya. METHODS: Two small pilot studies were conducted in Meru, Kenya after community report of high chronic pain in the region. First, a prevalence estimate was conducted among 89 participants from random households. Second, widespread chronic pain participants, recruited from the community, completed a demographic questionnaire, pain impact questionnaire, and 1-wk food/symptom diary...
February 5, 2018: Nutrition
https://www.readbyqxmd.com/read/29615900/peripheral-cb1-receptor-neutral-antagonist-am6545-ameliorates-hypometabolic-obesity-and-improves-adipokine-secretion-in-monosodium-glutamate-induced-obese-mice
#5
Haiming Ma, Guina Zhang, Chunrong Mou, Xiujuan Fu, Yadan Chen
Effect of peripheral cannabinoid receptor 1 (CB1R) blockade by AM6545 in the monosodium glutamate (MSG)-induced hypometabolic and hypothalamic obesity was observed, and the impact on intraperitoneal adipose tissue and adipokines was investigated. The MSG mice is characterized by excessive abdominal obesity, and combined with dyslipidemia and insulin resistance. 3-Week AM6545 treatment dose-dependently decreased the body weight, intraperitoneal fat mass, and rectified the accompanied dyslipidemia include elevated serum triglyceride, total cholesterol, free fatty acids, and lowered LDLc level...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29615659/sex-based-differences-in-phagocyte-metabolic-profile-in-rats-with-monosodium-glutamate-induced-obesity
#6
Mariia P Rudyk, Valentyna V Pozur, Daryna O Voieikova, Yevheniia V Hurmach, Nataliia M Khranovska, Oksana V Skachkova, Vitalina M Svyatetska, Olexander G Fedorchuk, Larysa M Skivka, Tetiana V Berehova, Liudmyla I Ostapchenko
The important component of obesity pathogenesis is inflammatory activation of innate immune cells within adipose tissue and in other body locations. Both the course of obesity and innate immune reactivity are characterized by sex-associated differences. The aim of the work was a comparative investigation of metabolic profiles of phagocytes from different locations in male and female rats with MSG-induced obesity. The administration of monosodium glutamate (MSG) caused obesity, with sex-associated differences, that was more severe in male rats...
April 3, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29599485/neurocognitive-effects-of-umami-association-with-eating-behavior-and-food-choice
#7
Greta Magerowski, Gabrielle Giacona, Laura Patriarca, Konstantinos Papadopoulos, Paola Garza-Naveda, Joanna Radziejowska, Miguel Alonso-Alonso
Free glutamate, a key substance underlying the umami taste of foods, fulfills a number of physiological functions related to energy balance. Previous experimental studies have shown that intake of a broth or soup supplemented with monosodium glutamate (MSG) prior to a meal can decrease appetite and food intake, particularly in women with propensity to overeat and gain weight. In this study, we examined potential neurocognitive mechanisms underlying this effect. We evaluated changes after intake of a chicken broth with or without MSG added (MSG+/MSG-) in a sample of healthy young women...
March 30, 2018: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29588172/short-term-perception-of-and-conditioned-taste-aversion-to-umami-taste-and-oral-expression-patterns-of-umami-taste-receptors-in-chickens
#8
Yuta Yoshida, Fuminori Kawabata, Yuko Kawabata, Shotaro Nishimura, Shoji Tabata
Umami taste is one of the five basic tastes (sweet, umami, bitter, sour, and salty), and is elicited by l-glutamate salts and 5'-ribonucleotides. In chickens, the elucidation of the umami taste sense is an important step in the production of new feedstuff for the animal industry. Although previous studies found that chickens show a preference for umami compounds in long-term behavioral tests, there are limitations to our understanding of the role of the umami taste sense in chicken oral tissues because the long-term tests partly reflected post-ingestive effects...
March 24, 2018: Physiology & Behavior
https://www.readbyqxmd.com/read/29568101/cyp2a6-is-associated-with-obesity-studies-in-human-samples-and-a-high-fat-diet-mouse-model
#9
Kesheng Wang, Xue Chen, Stephen C Ward, Ying Liu, Youssoufou Ouedraogo, Chun Xu, Arthur I Cederbaum, Yongke Lu
BACKGROUND/OBJECTIVES: CYP2A6 (CYP2A5 in mice) is mainly expressed in the liver. Hepatic CYP2A6 expression is increased in patients with non-alcoholic fatty liver disease (NAFLD). In mice, hepatic CYP2A5 is induced by high fat diet (HFD) feeding. Hepatic CYP2A5 is also increased in monosodium glutamate-induced obese mice. NAFLD is associated with obesity. In this study, we examined whether obesity is related to CYP2A6. SUBJECTS/METHODS: Obesity genetic association study: The SAGE is a comprehensive genome-wide association study (GWAS) with case subjects having a lifetime history of alcohol dependence and control subjects never addicted to alcohol...
February 20, 2018: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/29522769/n-acetyl-l-cysteine-treatment-efficiently-prevented-pre-diabetes-and-inflamed-dysmetabolic-liver-development-in-hypothalamic-obese-rats
#10
Hernán Gonzalo Villagarcía, María Cecilia Castro, Luisa González Arbelaez, Guillermo Schinella, María Laura Massa, Eduardo Spinedi, Flavio Francini
AIM: Hypothalamic obese rats are characterized by pre-diabetes, dyslipidemia, hyperadiposity, inflammation and, liver dysmetabolism with oxidative stress (OS), among others. We studied endocrine-metabolic dysfunctions and, liver OS and inflammation in both monosodium l-glutamate (MSG)-neonatally damaged and control litter-mate (C) adult male rats, either chronically treated with N-Acetyl-l-Cysteine since weaned (C-NAC and MSG-NAC) or not. METHODOLOGY: We evaluated circulating TBARS, glucose, insulin, triglycerides, uric acid (UA) and, aspartate and alanine amino-transferase; insulin sensitivity markers (HOMA indexes, Liver Index of Insulin Sensitivity -LISI-) were calculated and liver steps of the insulin-signaling pathway were investigated...
March 6, 2018: Life Sciences
https://www.readbyqxmd.com/read/29514800/association-between-salt-substitutes-enhancers-and-changes-in-sodium-levels-in-fast-food-restaurants-a-cross-sectional-analysis
#11
Mary J Scourboutakos, Sarah A Murphy, Mary R L'Abbé
BACKGROUND: Restaurant foods have high sodium levels, and efforts have been made to promote reductions. The objective of this study was to understand if salt substitutes and enhancers are associated with changes in sodium levels in fast-food restaurants. METHODS: A longitudinal database (MENU-FLIP) containing nutrition information for Canadian chain restaurants with 20 or more locations nationally was created in 2010 and updated in 2013 and 2016. In 2016, when available, ingredient lists were collected from restaurant websites and searched for the presence of salt substitutes/enhancers...
March 7, 2018: CMAJ Open
https://www.readbyqxmd.com/read/29510852/protective-role-of-co-administration-of-vitamin-d-in-monosodium-glutamate-induced-obesity-in-female-rats
#12
Padmanabha Nandan, Arun Kumar Nayanatara, Roopesh Poojary, K Bhagyalakshmi, M Nirupama, Rekha D Kini
PURPOSE: Obesity in females is an emerging health problem. The consumption of MSG has been considered as a risk factor for obesity. The tastemakers in Chinese and fast foods, such as fish sauce and soy sauce, contain very high levels of glutamate. The deficiency of Vitamin D is associated with obesity and metabolic syndrome. Therefore, the present study aimed to determine the effect of co-administration of Vitamin D on body weight control in MSG-induced obese rats. METHODS: Eighteen adult female Wistar rats were randomly divided into three groups equally...
February 2018: Journal of the National Medical Association
https://www.readbyqxmd.com/read/29443544/taste-sensitivity-to-a-mixture-of-monosodium-glutamate-and-inosine-5-monophosphate-by-mice-lacking-both-subunits-of-the-t1r1-t1r3-amino-acid-receptor
#13
Ginger D Blonde, Susan P Travers, Alan Craig Spector
The taste of L-glutamate and its synergism with 5'-ribonucleotides is thought to be primarily mediated through the T1R1+T1R3 heterodimer in some mammals including rodents and humans. While knockout (KO) mice lacking either receptor subunit show impaired sensitivity to a range of monosodium glutamate (MSG) concentrations mixed with 2.5mM inosine 5'-monophosphate (IMP) in amiloride, wild-type (WT) controls can detect this IMP concentration, hindering direct comparison between genotypes. Moreover, some residual sensitivity persists in the KO group, suggesting that the remaining subunit could maintain a limited degree of function...
February 14, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29441869/monosodium-glutamate-induced-obesity-changed-the-expression-and-activity-of-glutathione-s-transferases-in-mouse-heart-and-kidney
#14
I Boušová, Š Košťáková, P Matoušková, H Bártíková, B Szotáková, L Skálová
Obesity may affect activity and/or expression of enzymes participating in xenobiotics' detoxification and antioxidant defense. This study sought to investigate the activities and expression of cardiac and renal glutathione S-transferase (GST) isoforms in order to reveal possible differences between obese and control mice. For this purpose, mice with monosodium glutamate (MSG)-induced obesity were used as an experimental model. Obesity was induced in newborn male mice by repeated s.c. administration of MSG. At 8 months of age, mice were sacrificed and specific activity, protein and mRNA expressions levels of GSTs were analyzed in their heart and kidney...
May 1, 2017: Die Pharmazie
https://www.readbyqxmd.com/read/29414166/thermogravimetric-analysis-and-kinetic-modeling-of-low-transition-temperature-mixtures-pretreated-oil-palm-empty-fruit-bunch-for-possible-maximum-yield-of-pyrolysis-oil
#15
Chung Loong Yiin, Suzana Yusup, Armando T Quitain, Yoshimitsu Uemura, Mitsuru Sasaki, Tetsuya Kida
The impacts of low-transition-temperature mixtures (LTTMs) pretreatment on thermal decomposition and kinetics of empty fruit bunch (EFB) were investigated by thermogravimetric analysis. EFB was pretreated with the LTTMs under different duration of pretreatment which enabled various degrees of alteration to their structure. The TG-DTG curves showed that LTTMs pretreatment on EFB shifted the temperature and rate of decomposition to higher values. The EFB pretreated with sucrose and choline chloride-based LTTMs had attained the highest mass loss of volatile matter (78...
January 31, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29402603/monosodium-glutamate-impairs-the-contraction-of-uterine-visceral-smooth-muscle-ex-vivo-of-rat-through-augmentation-of-acetylcholine-and-nitric-oxide-signaling-pathways
#16
Mukti Mondal, Kaushik Sarkar, Partha Pratim Nath, Ashma Khatun, Sanghamitra Pal, Goutam Paul
The aim of the study was to examine the toxic effects of Monosodium glutamate (MSG), an extensively used food additive, on the contraction of uterine visceral smooth muscle (UVSM) in rat and to elucidate the probable neurocrine mechanism involved in it. MSG produced significant potentiation of the force and inhibition of frequency of uterus recorded ex vivo in chronic MSG exposure and in single dose acute experiments. MSG also produced significant potentiation of force of acetylcholine induced contraction and no alterations in atropine induced contraction of uterus...
February 2, 2018: Reproductive Biology
https://www.readbyqxmd.com/read/29389591/optimization-of-culture-conditions-for-gamma-aminobutyric-acid-production-in-fermented-adzuki-bean-milk
#17
Hung Yi Song, Roch Chui Yu
γ-Aminobutyric acid (GABA), a nonprotein amino acid, is widely distributed in nature and fulfills several physiological functions. In this study, various lactic acid strains commonly used to produce fermented milk products were inoculated into adzuki bean milk for producing GABA. The high GABA producing strain was selected in further experiment to improve the GABA production utilizing culture medium optimization. The results demonstrated that adzuki bean milk inoculated with Lactobacillus rhamnosus GG increased GABA content from 0...
January 2018: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/29374793/taurine-supplementation-prevents-endothelial-dysfunction-and-attenuates-structural-changes-in-aortas-from-hypothalamic-obese-rats
#18
Valéria F Leão, Letícia L D M Ferreira, Cinthya M Melo, Maria L Bonfleur, Leandro L da Silva, Everardo M Carneiro, Juliana M Raimundo, Rosane A Ribeiro
PURPOSE: Obesity predisposes to cardiovascular and metabolic diseases. The amino acid, L-taurine (Tau), regulates glucose and lipid homeostasis and vascular function. Here we investigated whether Tau supplementation prevents endothelial dysfunction in the thoracic aortas of monosodium glutamate-induced obese (MSG) rats. METHODS: Male rats received subcutaneous injections of MSG (4 mg/kg body weight/day) or saline (control group, CTL) during the first five days of life...
January 27, 2018: European Journal of Nutrition
https://www.readbyqxmd.com/read/29329874/a-survey-of-free-glutamic-acid-in-foods-using-a-robust-lc-ms-ms-method
#19
Nur Cebi, Canan Ekinci Dogan, Elmas Oktem Olgun, Osman Sagdic
An effective and simultaneous liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was used with the aim of quantifying monosodium glutamate (MSG) in foodstuffs, such as chips, taste cubes, sauces and soups. The results were linear (R2  = 1), with very low LOD and LOQ values, 1.0 µg/kg, 5.0 µg/kg, respectively. Excellent repeatability and reproducibility were also achieved. This highly sensitive and robust LC-MS/MS technique was applied successfully for the detection and quantification of MSG in a wide variety of foodstuffs...
May 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29328403/arcuate-nucleus-neurons-are-not-essential-for-the-preprandial-peak-in-plasma-ghrelin-after-neonatal-monosodium-glutamate-treatment
#20
Qing-Chun Li, Qing-Feng Li, Yan-Lin Wang, Hong-Liang Sun, Zheng-Yao Jiang
The aim of the present study was to determine whether arcuate nucleus (ARC) lesions affect the ghrelin level in the plasma and the stomach in monosodium glutamate (MSG)‑treated mice. The aim of the present study was to investigate whether the ARC was destroyed in mice treated neonatally with MSG, and whether the ARC lesions affect the ghrelin level in the plasma and lipid mobilization in MSG‑treated mice. The results revealed that MSG led to a marked reduction in ARC cresyl violet staining, tyrosine hydroxylase-immunoreactive (IR) neurons and neuropeptide Y‑IR fibers, compared with saline controls...
March 2018: International Journal of Molecular Medicine
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