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https://www.readbyqxmd.com/read/29777831/microcystis-bloom-containing-microcystin-lr-induces-type-2-diabetes-mellitus
#1
Qiong Zhang, Wendi Qin, Liuyan Yang, Jing An, Xuxiang Zhang, Hao Hong, Lizhi Xu, Yaping Wang
Epidemiological data from Lake Taihu showed significantly higher incidences of type 2 diabetes mellitus (T2DM) than in other areas of China. This may be related to the occurrence of a Microcystis bloom in Lake Taihu in the summer and autumn every year. The objective of this study is to investigate whether the contaminated water from the Microcystis bloom and the derivative pollutant microcystin-LR (MC-LR) can explain the higher incidences of T2DM. Healthy male mice were fed with water from different regions of Lake Taihu, and were either acutely or chronically exposed to MC-LR through oral administration or intraperitoneal injection...
May 16, 2018: Toxicology Letters
https://www.readbyqxmd.com/read/29772231/roles-of-14-3-3%C3%AE-and-%C3%AE-in-regulation-of-the-glucocorticoid-receptor-transcriptional-activation-and-hepatic-gluconeogenesis
#2
Yunhee Hwang, Hyoung-Tae An, Minsoo Kang, Jesang Ko
The glucocorticoid receptor (GR) is a ligand-dependent transcription factor that mediates the effects of glucocorticoids, and plays a crucial role in cell growth, development, inflammation, and gluconeogenesis. The 14-3-3 proteins bind to target proteins via phosphorylation, and influence many cellular events by altering their subcellular localization or by acting as chaperones. However, the mechanisms by which 14-3-3 proteins regulate GR transactivation and their involvement in gluconeogenesis remain uncharacterized...
May 14, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29769432/deacetylation-of-metabolic-enzymes-by-sirt2-modulates-pyruvate-homeostasis-to-extend-insect-lifespan
#3
Tao Wang, Shao-Lei Geng, Yu-Min Guan, Wei-Hua Xu
Diapause in insects is akin to dauer in Caenorhabditis elegans and hibernation in vertebrates. Diapause causes a profound extension of lifespan by low metabolic activity. However, the detailed regulatory mechanisms for low metabolic activity remain unknown. Here, we showed that low pyruvate levels are present in the brains of diapause-destined pupae of the cotton bollworm Helicoverpa armigera , and three enzymes pyruvate kinase (PK), phosphoenolpyruvate carboxykinase (PEPCK), and phosphoglycerate mutase (PGAM) are closely correlated with pyruvate homeostasis...
May 16, 2018: Aging
https://www.readbyqxmd.com/read/29768504/sarcopoterium-spinosum-extract-improved-insulin-sensitivity-in-mice-models-of-glucose-intolerance-and-diabetes
#4
Konstantin Rozenberg, Tovit Rosenzweig
BACKGROUND: The glucose lowering properties of Sarcopoterium spinosum, a traditional medicinal plant, were previously validated by us using KK-Ay mice as a genetic model for type 2 diabetes (T2D). OBJECTIVE: To clarify the effects of Sarcopoterium spinosum extract (SSE) on diet-induced glucose intolerance and to investigate SSE effects on carbohydrate and lipid metabolism in target tissues of both high-fat-diet (HFD)-fed and KK-Ay mice. RESULTS: Mice were given SSE (70 mg/day) for 6 weeks...
2018: PloS One
https://www.readbyqxmd.com/read/29768256/overexpression-of-pck1-gene-antagonizes-hepatocellular-carcinoma-through-the-activation-of-gluconeogenesis-and-suppression-of-glycolysis-pathways
#5
Yufu Tang, Yibing Zhang, Chunhui Wang, Zhongyi Sun, Longfei Li, Shuqun Cheng, Wenping Zhou
BACKGROUND/AIMS: Gluconeogenesis, a reverse process of glycolysis, is suppressed in neoplastic livers. Cytoplasmic phosphoenolpyruvate carboxykinase (PEPCK-C/PCK1, encoded by PCK1) is a step limiting enzyme of gluconeogenesis. The induced expression of the factor is reported to initiate gluconeogenesis process and antagonize hepatocellular carcinoma (HCC). In the current study, the effect of the modulation of PCK1 expression on HCC was assessed. METHODS: The levels of PCK1 in clinical HCC tissues and different HCC cell lines were investigated with real time quantitative PCR, immunochemistry, and western blotting...
May 11, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29767079/gluconeogenesis-during-starvation-and-refeeding-phase-is-affected-by-previous-dietary-carbohydrates-levels-and-a-glucose-stimuli-during-early-life-in-siberian-sturgeon-acipenser-baerii
#6
Xiaofang Liang, Jia Wang, Guan Gong, Min Xue, Yingchao Dong, Xiufeng Wu, Xin Wang, Chunshan Chen, Xufang Liang, Yuchang Qin
Gluconeogenesis responses was assessed during a short starvation period and subsequent refeeding in Siberian sturgeon ( Acipenser baerii ) previously fed different dietary carbohydrates levels and experienced to a glucose stimuli during early life. The sturgeon larvae were previously fed either a high glucose diet (G) or a low glucose diet (F) from the first feeding to yolk absorption (8 to 12 d post-hatching [dph]). Each group of fish was sub-divided into 2 treatments at 13 dph and was fed either a high-carbohydrate diet (H) or a low carbohydrate diet (L) until 20 wk...
September 2017: Animal nutrition
https://www.readbyqxmd.com/read/29751237/current-anti-diabetic-agents-and-their-molecular-targets-a-review
#7
REVIEW
Nagaraju Kerru, Ashona Singh-Pillay, Paul Awolade, Parvesh Singh
Diabetes mellitus is a medical condition characterized by the body's loss of control over blood sugar. The frequency of diagnosed cases and consequential increases in medical costs makes it a rapidly growing chronic disease that threatens human health worldwide. In addition, its unnerving statistical projections are perilous to both the economy of the nation and man's life expectancy. Type-I and type-II diabetes are the two clinical forms of diabetes mellitus. Type-II diabetes mellitus (T2DM) is illustrated by the abnormality of glucose homeostasis in the body, resulting in hyperglycemia...
May 3, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29747346/-phenotype-and-mechanism-of-inducible-ppp2r1a-knockout-mouse-model
#8
J L Fan, F P Wang, S Wang, X L Liu, X N Wu, W Chen, L P Chen, W X Li
Objective: Investigate the effects of inducible ppp2r1a knockout on main physiological function in adult mice and study the mechanism. Methods: Ppp2r1a(flox/flox) mice and CAGG-CreER mice were hybridized to obtain 20 CAGG-CreER ppp2r1a(flox/flox) and 20 mice in homozygous group. Two groups of mice were divided into 4 groups respectively, finally we got 8 groups with 5 mice in each group. Tamoxifen was injected intraperitoneally to acquire inducible ppp2r1a knockout mice. The knockout efficiency of PP2A Aα in vital organs was measured by Western blot...
May 6, 2018: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/29733999/discovery-and-structure-activity-relationships-study-of-thieno-2-3-b-pyridine-analogues-as-hepatic-gluconeogenesis-inhibitors
#9
Fei Ma, Jian Liu, Tingting Zhou, Min Lei, Jing Chen, Xiachang Wang, Yinan Zhang, Xu Shen, Lihong Hu
Type 2 diabetes mellitus (T2DM) is a chronic, complex and multifactorial metabolic disorder, and targeting gluconeogenesis inhibition is a promising strategy for anti-diabetic drug discovery. This study discovered a new class of thieno[2,3-b]pyridine derivatives as hepatic gluconeogenesis inhibitors. First, a hit compound (DMT: IC50  = 33.8 μM) characterized by a thienopyridine core was identified in a cell-based screening of our privileged small molecule library. Structure activity relationships (SARs) study showed that replaced the CF3 in the thienopyridine core could improve the potency and led to the discovery of 8e (IC50  = 16...
April 24, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29729383/ameliorative-potential-of-lavandula-stoechas-in-metabolic-syndrome-via-multitarget-interactions
#10
S S Kulabas, H Ipek, A R Tufekci, S Arslan, I Demirtas, R Ekren, U Sezerman, T B Tumer
ETHNOPHARMACOLOGICAL IMPORTANCE: Decoction and infusion prepared from aerial parts of Lavandula stoechas L. (L. stoechas) have been traditionally used as remedy against several components of metabolic syndrome (MetS) and associated disorders including type II diabetes and cardiovascular diseases by Anatolian people. AIM OF THE STUDY: The aim is to elucidate the potential ameliorative effects of L. stoechas aqueous extracts on insulin resistance and inflammation models through multitarget in vitro approaches and also to elucidate mechanism of action by analyzing transcriptional and metabolic responses...
May 2, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29721283/trait-and-phylogenetic-diversity-provide-insights-into-community-assembly-of-reef-associated-shrimps-palaemonidae-at-different-spatial-scales-across-the-chagos-archipelago
#11
Catherine E I Head, Heather Koldewey, Sandrine Pavoine, Morgan S Pratchett, Alex D Rogers, Michelle L Taylor, Michael B Bonsall
Coral reefs are the most biodiverse marine ecosystem and one of the most threatened by global climate change impacts. The vast majority of diversity on reefs is comprised of small invertebrates that live within the reef structure, termed the cryptofauna. This component of biodiversity is hugely understudied, and many species remain undescribed. This study represents a rare analysis of assembly processes structuring a distinct group of cryptofauna, the Palaemonidae, in the Chagos Archipelago, a reef ecosystem under minimal direct human impacts in the central Indian Ocean...
April 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29710028/vitamin-d-deficiency-increases-lipogenesis-and-reduces-beta-oxidation-in-the-liver-of-diet-induced-obese-mice
#12
Celina Carvalho Borges, Andreza Fernandes Salles, Isabele Bringhenti, Carlos Alberto Mandarim-DE-Lacerda, Marcia Barbosa Aguila
The study was conducted to understand better the mechanisms involved in liver changes when there is a combination of diet-induced obesity (DIO) and vitamin D deficiency (VDD). After 8 wk of feeding a control diet (C group) or a high-fat diet (HF), both with vitamin D, and counterpart groups without vitamin D (VitD- groups), we found in plasma: higher alanine aminotransferase, and aspartate aminotransferase in the VitD- groups, and more elevated total cholesterol in the HF group. Compared to their counterparts, HF and HF/VitD- showed hyperinsulinemia and higher hepatic triglycerides and steatosis...
2018: Journal of Nutritional Science and Vitaminology
https://www.readbyqxmd.com/read/29704219/receptor-gene-protein-mediated-signaling-connects-methylprednisolone-exposure-to-metabolic-and-immune-related-pharmacodynamic-actions-in-liver
#13
Vivaswath S Ayyar, Siddharth Sukumaran, Debra C DuBois, Richard R Almon, Jun Qu, William J Jusko
A multiscale pharmacodynamic model was developed to characterize the receptor-mediated, transcriptomic, and proteomic determinants of corticosteroid (CS) effects on clinically relevant hepatic processes following a single dose of methylprednisolone (MPL) given to adrenalectomized (ADX) rats. The enhancement of tyrosine aminotransferase (TAT) mRNA, protein, and enzyme activity were simultaneously described. Mechanisms related to the effects of MPL on glucose homeostasis, including the regulation of CCAAT-enhancer binding protein-beta (C/EBPβ) and phosphoenolpyruvate carboxykinase (PEPCK) as well as insulin dynamics were evaluated...
April 27, 2018: Journal of Pharmacokinetics and Pharmacodynamics
https://www.readbyqxmd.com/read/29693104/c-phycocyanin-inhibits-hepatic-gluconeogenesis-and-increases-glycogen-synthesis-via-activating-akt-and-ampk-in-insulin-resistance-hepatocytes
#14
Zhiheng Ren, Zhifei Xie, Danni Cao, Mufeng Gong, Lei Yang, Zhu Zhou, Yu Ou
C-Phycocyanin (C-PC), a kind of blue protein isolated from Spirulina platensis, can ameliorate hyperglycemia, but its effects on gluconeogenesis and glycogenesis are unknown. In the present study, we investigated the effects and underlying mechanisms of C-PC on gluconeogenesis and glycogenesis in insulin resistant hepatocytes. Insulin resistance was induced by high glucose (HG) in human hepatocellular carcinoma (HepG2) cells. C-PC ameliorated glucose production and phosphoenolpyruvate carboxykinase (PEPCK) and glucose-6-phosphatase (G6Pase) expression in HG-induced insulin resistant HepG2 cells...
April 25, 2018: Food & Function
https://www.readbyqxmd.com/read/29693103/wheat-bran-with-enriched-gamma-aminobutyric-acid-attenuates-glucose-intolerance-and-hyperinsulinemia-induced-by-a-high-fat-diet
#15
Wenting Shang, Xu Si, Zhongkai Zhou, Padraig Strappe, Chris Blanchard
In this study, the level of gamma-aminobutyric acid (GABA) in wheat bran was increased to be six times higher through the action of endogenous glutamate decarboxylase compared with untreated bran. The process of GABA formation in wheat bran also led to an increased level of phenolic compounds with enhanced antioxidant capacity 2 times higher than the untreated status. The interventional effect of a diet containing GABA-enriched bran on hyperinsulinemia induced by a high-fat diet (HFD) was investigated in a rat model...
April 25, 2018: Food & Function
https://www.readbyqxmd.com/read/29674343/impacts-of-pre-and-postnatal-nutrition-on-glucagon-regulation-and-hepatic-signalling-in-sheep
#16
Bishnu Adhikari, Prabhat Khanal, Mette Olaf Nielsen
To evaluate the long-term impacts of early life nutritional manipulations on glucagon secretion and hepatic signalling, thirty-six twin pregnant ewes during their last trimester were exposed to NORM (fulfilling 100% of daily energy/protein requirements), HIGH (fulfilling 150/110% of daily energy/protein requirements) or LOW (50% of NORM) diets. Twin lambs were assigned after birth to a moderate (CONV) or high-carbohydrate-high-fat (HCHF) diet until six months. Then responses in plasma glucagon concentrations and glucagon ratios relative to previously reported values for insulin, glucose and lactate were determined after intravenous bolus injections of glucose or propionate (fed and 2-days fasting state)...
April 19, 2018: Journal of Endocrinology
https://www.readbyqxmd.com/read/29668871/transgenic-mice-overexpressing-srebp-1a-in-male-ob-ob-mice-exhibit-lipodystrophy-and-exacerbate-insulin-resistance
#17
Hiroshi Ohno, Takashi Matsuzaka, Nie Tang, Rahul Sharma, Kaori Motomura, Takuya Shimura, Aoi Satoh, Song-Iee Han, Yoshinori Takeuchi, Yuichi Aita, Hitoshi Iwasaki, Shigeru Yatoh, Hiroaki Suzuki, Motohiro Sekiya, Yoshimi Nakagawa, Hirohito Sone, Naoya Yahagi, Nobuhiro Yamada, Yoshikazu Higami, Hitoshi Shimano
Sterol regulatory element-binding protein-1a (SREBP-1a) is a key transcription factor which activates the expression of genes involved in the synthesis of fatty acids, triglycerides, and cholesterol. Transgenic mice that overexpress the nuclear form of SREBP-1a under the control of phosphoenolpyruvate carboxykinase (PEPCK) promoter (Tg-1a) were previously shown to display a lipodystrophic phenotype characterized by enlarged and fatty livers, diminished peripheral white adipose tissue (WAT), and insulin resistance...
April 12, 2018: Endocrinology
https://www.readbyqxmd.com/read/29582416/body-fat-reduction-without-cardiovascular-alteration-in-mice-under-oral-treatment-by-the-mao-inhibitor-phenelzine
#18
Christian Carpéné, Josep Mercader, Sophie Le Gonidec, Stéphane Schaak, Jeanne Mialet-Perez, Alexia Zakaroff-Girard, Jean Galitzky
BACKGROUND AND PURPOSE: Phenelzine is an antidepressant drug increasing the risk of hypertensive crisis when dietary tyramine is not restricted. However, this monoamine oxidase (MAO) inhibitor is known to inhibit other enzymes not limited to the nervous system. We studied whether its antiadipogenic and antilipogenic effects in cultured adipocytes could contribute to a mitigation of fattening without unwanted hypertensive or cardiovascular effects. EXPERIMENTAL APPROACH: Mice were fed a standard chow and subjected to a 0...
March 26, 2018: British Journal of Pharmacology
https://www.readbyqxmd.com/read/29567217/bioactive-polyphenols-in-kink%C3%A3-liba-tea-combretum-micranthum-and-their-glucose-lowering-activities
#19
Cara Welch, Jing Zhen, Emmanuel Bassène, Ilya Raskin, James Edward Simon, Qingli Wu
Herbal tea kinkéliba prepared from the leaves of Combretum micranthum has been widely consumed in West African countries for its flavor, nutritional and medicinal properties. Under bio-guided screening, the kinkéliba leaves were chemically investigated using various chromatographic and spectrometric methods that led to the identification of thirteen different flavonoid compounds. Further biological tests illustrated that the identified compounds may have synergistic effects to decrease the expression of phosphoenolpyruvate carboxykinase (PEPCK) mRNA and glucose production in an H4IIE hepatoma cell line, indicating its potential use for insulin-resistant diabetes treatment...
April 2018: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/29561185/differences-in-renal-ammonia-metabolism-in-male-and-female-kidney
#20
Autumn N Harris, Hyun-Wook Lee, Gunars Osis, Lijuan Fang, Kierstin L Webster, Jill W Verlander, I David Weiner
Renal ammonia metabolism has a major role in the maintenance of acid-base homeostasis. Sex differences are well recognized as an important biological variable in many aspects of renal function, including fluid and electrolyte metabolism. However, sex differences in renal ammonia metabolism have not been previously reported. Therefore, the purpose of the current study was to investigate sex differences in renal ammonia metabolism. We studied 4-month-old wild type C57BL/6 mice fed a normal diet. Despite similar levels of food intake, and thus protein intake, which is the primary determinant of endogenous acid production, female mice excreted greater amounts of ammonia, but not titratable acids, than did male mice...
March 21, 2018: American Journal of Physiology. Renal Physiology
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