Abstract:
BACKGROUND:Amino acid availability stimulates protein synthesis via the mTORC1 (mechanistic target of rapamycin complex 1) signaling pathway. In response to an increase in cellular amino acid availability, translocation of cytosolic mTORC1 to the lysosomal surface is required to stimulate mTORC1 kinase activity. However, research elucidating the amino acid responsive mechanisms have thus far only been conducted in in vitro models. Our primary objective was to determine whether an increase in amino acid availability within human skeletal muscle in vivo would alter the expression of genes associated with amino acid sensing, transport and mTORC1 regulation. Our secondary objective was to determine whether an acute perturbation in lysosomal function would disrupt the normal pattern of muscle amino acid responsive gene expression. METHODS:We recruited 13 young adults into one of two groups: The first group ingested 10 g of essential amino acids (EAA). The second group ingested 10 g of EAA in the presence of chloroquine (CQ), a lysosomotropic agent. The subjects from each group had biopsies of the vastus lateralis taken before and after EAA ingestion. We determined the relative mRNA expression of 51 potential amino acid responsive genes using RT-qPCR. RESULTS:There was a differential mRNA expression for 22 genes, with 15 mRNAs significantly changing (P < 0.05) in response to EAA ingestion (e.g., REDD1: +209 ± 35%; SLC38A9: +31 ± 9%; SLC38A10: +57 ± 15%). In the CQ group, EAA ingestion resulted in a differential expression as compared to EAA alone (i.e., 11 out of the 22 genes were different (P < 0.05) between the two groups.). CONCLUSIONS:Expression of several amino acid sensing, transport, and mTORC1 regulatory genes in human skeletal muscle are responsive to an increase in amino acid availability. Furthermore, potential acute disruption of lysosomal function by ingestion of chloroquine interferes with the normal pattern of gene expression following feeding. Our in vivo data in humans provide preliminary support for the in vitro work linking amino acid sensing pathways to mTORC1 translocation to the lysosome. TRIAL REGISTRATION:NCT00891696. Registered 29 April 2009.
journal_name
Nutr Metab (Lond)journal_title
Nutrition & metabolismauthors
Graber TG,Borack MS,Reidy PT,Volpi E,Rasmussen BBdoi
10.1186/s12986-017-0187-1subject
Has Abstractpub_date
2017-05-11 00:00:00pages
35issn
1743-7075pii
187journal_volume
14pub_type
杂志文章abstract:BACKGROUND:Two major risk factors for the onset of fatty liver disease are excessive alcohol intake and obesity, the latter being associated with non-alcoholic fatty liver disease (NAFLD). The aim of this study was to examine the effects of black rice extract (BRE) on hepatic steatosis and insulin resistance in high-fa...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-9-27
更新日期:2012-03-30 00:00:00
abstract:BACKGROUND:The aim of this study was to investigate whether two variants of the TCF7L2 (rs7903146 and rs12255372) modify the association between nut consumption and the risk of metabolic syndrome (MetS). Additionally, the modifying effect of weight change during follow-up on these associations was investigated. MATERI...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-021-00542-7
更新日期:2021-01-12 00:00:00
abstract:Background:High levels circulating saturated fatty acids are associated with diabetes, obesity and hyperlipidemia. In heart, the accumulation of saturated fatty acids has been determined to play a role in the development of heart failure and diabetic cardiomyopathy. High-density lipoprotein (HDL) has been reported to p...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-019-0356-5
更新日期:2019-05-28 00:00:00
abstract:BACKGROUND:Glutathione has a wide range of functions; it is an endogenous anti-oxidant and plays a key role in the maintenance of intracellular redox balance and detoxification of xenobiotics. Several studies have indicated that children with autism spectrum disorders may have altered glutathione metabolism which could...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-9-35
更新日期:2012-04-24 00:00:00
abstract:: Drug-drug interactions have become an important issue in health care. It is now realized that many drug-drug interactions can be explained by alterations in the metabolic enzymes that are present in the liver and other extra-hepatic tissues. Many of the major pharmacokinetic interactions between drugs are due to hepa...
journal_title:Nutrition & metabolism
pub_type: 杂志文章,收录出版
doi:10.1186/1743-7075-5-27
更新日期:2008-10-18 00:00:00
abstract:BACKGROUND:Obesity is a major risk factor for insulin resistance, type 2 diabetes, and stroke. Flavonoids are effective antioxidants that protect against these chronic diseases. In this study, we evaluated the effects of sudachitin, a polymethoxylated flavonoid found in the skin of the Citrus sudachi fruit, on glucose,...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-11-32
更新日期:2014-07-04 00:00:00
abstract:Background:NAFLD as a result of inappropriate diet and obesity, may progress to sever conditions such as: type 2 diabetes mellitus or steatohepatitis, and has recently become a prevalent topic of numerous investigations. Due to its dangerous aftermaths, finding new substances, such as polyphenols and their derivatives,...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-017-0223-1
更新日期:2017-11-13 00:00:00
abstract:BACKGROUND:Resveratrol is a natural polyphenol that has been proposed to improve glycemic control in diabetes, by mechanisms that involve improvement in insulin secretion and activity. In type 1 diabetes (T1D), in which insulin therapy is obligatory, resveratrol treatment has never been investigated. The present study ...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-016-0103-0
更新日期:2016-06-29 00:00:00
abstract:UNLABELLED: BACKGROUND:Leptin-deficient ob/ob mice exhibit adipocyte hypertrophy and hyperplasia as well as elevated adipose tissue and systemic inflammation. Multipotent stem cells isolated from adult adipose tissue can differentiate into adipocytes ex vivo and thereby contribute toward increased adipocyte cell numbe...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-9-109
更新日期:2012-12-05 00:00:00
abstract:BACKGROUND:Holotranscobalamin, cobalamin-saturated transcobalamin, is the minor fraction of circulating cobalamin (vitamin B12), which is available for cellular uptake and hence is physiologically relevant. Currently, no method allows simple, direct quantification of holotranscobalamin. We now report on the identificat...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-3-3
更新日期:2006-01-04 00:00:00
abstract:Background:Visceral adipose tissue (VAT) area is a strong predictor of obesity-related cardiometabolic alterations, but its measurement is costly, time consuming and, in some cases, involves radiation exposure. Glutamate, a by-product of branched-chain-amino-acid (BCAA) catabolism, has been shown to be increased in vis...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-018-0316-5
更新日期:2018-11-06 00:00:00
abstract:: Prior to the discovery of medical treatment for diabetes, carbohydrate-restriction was the predominant treatment recommendation to treat diabetes mellitus. In this commentary we argue that carbohydrate-restriction should be reincorporated into contemporary treatment studies for diabetes mellitus. ...
journal_title:Nutrition & metabolism
pub_type: 社论
doi:10.1186/1743-7075-5-10
更新日期:2008-04-09 00:00:00
abstract:BACKGROUND:Total body water (TBW) estimations have been used to estimate body composition, particularly fat-free mass, to aid in nutritional interventions, and to monitor hydration status. In the past, bioimpedance spectroscopy (BIS) devices have been used to estimate TBW. Previous investigations have examined the vali...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-5-7
更新日期:2008-03-19 00:00:00
abstract:Background:Diabetic patients are highly vulnerable to hypoxic injury, which is associated with hypoxia induced BNIP3 expression that subsequently activate apoptosis. Our previous research show that Tetramethylpyrazine (TMP), a food flavoring agent, represses the hypoxia induced BNIP3 expression attenuate myocardial apo...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-020-0432-x
更新日期:2020-01-31 00:00:00
abstract:BACKGROUND:Fasting is a rigorous type of dietary restriction that is associate with a number of health benefits. During fasting, ketone bodies significantly increase in blood and become major body fuels, thereby sparing glucose. In the present study, we investigated effects of fasting on hypersensitivity. In addition, ...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-11-40
更新日期:2014-08-28 00:00:00
abstract:BACKGROUND:A major portion of available fatty acids for adipocyte uptake is derived from lipoprotein lipase (LPL)-mediated hydrolysis of circulating lipoprotein particles. In vivo studies aimed at identifying the precise role of adipocyte-derived LPL in fat storage function of adipose tissue have been unable to provide...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-4-22
更新日期:2007-10-30 00:00:00
abstract::We studied the regulation of brain acetyl CoA carboxylase (ACC) activity during food deprivation and under the influence of hormones of glucose homeostasis: glucagon and insulin. Mice were deprived of food and water for time periods of 1, 3, 6, 9, 12 and 24 hours and were then allowed to re-feed for 5, 30 and 60 minut...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-3-15
更新日期:2006-02-16 00:00:00
abstract:Background:The resting metabolic rate (RMR) decrease, observed after an obesity reduction therapy is a determinant of a short-time weight regain. Thus, the objective of this study was to evaluate changes in RMR, and the associated hormonal alterations in obese patients with a very low-calorie ketogenic (VLCK)-diet indu...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-018-0249-z
更新日期:2018-02-17 00:00:00
abstract:Background:Consumption of diet high in soy products is suggested to contribute to lower prostate cancer incidence in Asian men. But little has been known about the influences of dietary patterns on gut microbiota and microbiota-mediated isoflavone metabolism. Here, we determined the influences of western pattern diet o...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-019-0351-x
更新日期:2019-04-11 00:00:00
abstract:BACKGROUND:Increasing evidence suggests that diets high in polyunsaturated fatty acids (PUFA) confer health benefits by improving insulin sensitivity and lipid metabolism in liver, muscle and adipose tissue. METHODS:The present study investigates metabolic responses in two different lines of mice either selected for h...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-8-56
更新日期:2011-08-11 00:00:00
abstract:BACKGROUND:Body volume expands with the positive energy balance associated with the development of adult human obesity and this "growth" is captured by two widely used clinical metrics, waist circumference and body mass index (BMI). Empirical correlations between circumferences, BMI, and related body compartments are f...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-5-24
更新日期:2008-10-06 00:00:00
abstract:BACKGROUND:The aim of the present study was to examine the effects of onion as functional ingredient on the oxidative status, lipoprotein levels (total cholesterol-TC, HDL-C, LDL-C), triacylglycerides (TAG) and vascular reactivity of mesenteric arteries in hypercholesterolemic Wistar rats. METHODS:Twenty-four animals ...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-11-57
更新日期:2014-12-23 00:00:00
abstract:Background:Diet and exercise play important roles in ameliorating metabolic syndrome. Yunkang 10 (Camellia sinensis var. assamica) is a most cultivated tea variety for making tea in the Southwestern China. Currently, there is no report of healthy effects of Yunkang 10 green tea (YKGT) and treadmill exercise (Ex) on hig...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-020-0433-9
更新日期:2020-02-04 00:00:00
abstract:BACKGROUND:Trimethylamine-N-oxide (TMAO) is an independent risk factor for atherosclerosis. Consumption of hawthorn fruit is believed to be cardio-protective, yet whether it is able to suppress the TMAO-induced atherosclerosis remains unexplored. The present study was to investigate the effects of hawthorn fruit extrac...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-020-00535-y
更新日期:2021-01-07 00:00:00
abstract:BACKGROUND:The alanine aminotransferase (ALT)/aspartate aminotransferase (AST) ratio is reportedly associated with insulin resistance (IR). However, few studies have explored the relationship between the ALT/AST ratio and IR in the Chinese population. Here, we aimed to explore whether the ALT/AST ratio is associated an...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-017-0219-x
更新日期:2017-10-10 00:00:00
abstract:: Impaired kidney function and chronic kidney disease (CKD) leading to kidney failure and end-stage renal disease (ESRD) is a serious medical condition associated with increased morbidity, mortality, and in particular cardiovascular disease (CVD) risk. CKD is associated with multiple physiological and metabolic disturb...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-9-36
更新日期:2012-04-26 00:00:00
abstract:Background:To investigate the association between different obesity phenotypes and the risk of incident hypertension among both genders. Methods:The study population included 3659 Iranians (men = 1540), aged ≥20 years free of hypertension at baseline. Participants were classified into six categories of body mass index...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/s12986-019-0340-0
更新日期:2019-02-27 00:00:00
abstract:BACKGROUND:The composition of dietary fatty acids (FA) during early life may impact adult adipose tissue (AT) development. We investigated the effects of alpha-linolenic acid (ALA) intake during the suckling/weaning period on AT development and metabolic markers in the guinea pig (GP). METHODS:Newborn GP were fed a 27...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-7-8
更新日期:2010-01-29 00:00:00
abstract:BACKGROUND:Many publications link high homocysteine levels to cardiovascular disease. In Spain there is little information on the prevalence of hyperhomocysteinaemia and associated vitamin factors among the general population, and less still among children. Cardiovascular risk factors in the childhood population may be...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-6-39
更新日期:2009-10-05 00:00:00
abstract:: Liver steatosis is a frequent histological feature in patients chronically infected with hepatitis C virus (HCV). The relationship between HCV and hepatic steatosis seems to be the result of both epigenetic and genetic factors. In vivo and in vitro studies have shown that HCV can alter intrahepatic lipid metabolism b...
journal_title:Nutrition & metabolism
pub_type: 杂志文章
doi:10.1186/1743-7075-7-13
更新日期:2010-02-23 00:00:00