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https://www.readbyqxmd.com/read/28640904/correlation-of-disease-severity-with-body-weight-and-high-fat-diet-in-the-fatzo-pco-mouse
#1
Brian A Droz, Bria L Sneed, Charles V Jackson, Karen M Zimmerman, M Dodson Michael, Paul J Emmerson, Tamer Coskun, Richard G Peterson
Obesity in many current pre-clinical animal models of obesity and diabetes is mediated by monogenic mutations; these are rarely associated with the development of human obesity. A new mouse model, the FATZO mouse, has been developed to provide polygenic obesity and a metabolic pattern of hyperglycemia and hyperinsulinemia, that support the presence of insulin resistance similar to metabolic disease in patients with insulin resistance/type 2 diabetes. The FATZO mouse resulted from a cross of C57BL/6J and AKR/J mice followed by selective inbreeding for obesity, increased insulin and hyperglycemia...
2017: PloS One
https://www.readbyqxmd.com/read/28640857/glucose-dysregulation-and-response-to-common-anti-diabetic-agents-in-the-fatzo-pco-mouse
#2
Richard G Peterson, Charles Van Jackson, Karen M Zimmerman, Jorge Alsina-Fernandez, M Dodson Michael, Paul J Emmerson, Tamer Coskun
The FATZO/Pco mouse is the result of a cross of the C57BL/6J and AKR/J strains. The crossing of these two strains and the selective inbreeding for obesity, insulin resistance and hyperglycemia has resulted in an inbred strain exhibiting obesity in the presumed presence of an intact leptin pathway. Routinely used rodent models for obesity and diabetes research have a monogenic defect in leptin signaling that initiates obesity. Given that obesity and its sequelae in humans are polygenic in nature and not associated with leptin signaling defects, the FATZO mouse may represent a more translatable rodent model for study of obesity and its associated metabolic disturbances...
2017: PloS One
https://www.readbyqxmd.com/read/28635632/glucose-and-lipid-dysmetabolism-in-a-rat-model-of-prediabetes-induced-by-a-high-sucrose-diet
#3
Ana Burgeiro, Manuela G Cerqueira, Bárbara M Varela-Rodríguez, Sara Nunes, Paula Neto, Frederico C Pereira, Flávio Reis, Eugénia Carvalho
Glucotoxicity and lipotoxicity are key features of type 2 diabetes mellitus, but their molecular nature during the early stages of the disease remains to be elucidated. We aimed to characterize glucose and lipid metabolism in insulin-target organs (liver, skeletal muscle, and white adipose tissue) in a rat model treated with a high-sucrose (HSu) diet. Two groups of 16-week-old male Wistar rats underwent a 9-week protocol: HSu diet (n = 10)-received 35% of sucrose in drinking water; Control (n = 12)-received vehicle (water)...
June 21, 2017: Nutrients
https://www.readbyqxmd.com/read/28626963/exercise-training-modulates-the-hepatic-renin-angiotensin-system-in-fructose-fed-rats
#4
Eliete Dalla Corte Frantz, Renata Frauches Medeiros, Isabele Gomes Giori, Juliana Bittencourt Silveira Lima, Thais Bento-Bernardes, Thaiane Gadioli Gaique, Caroline Fernandes-Santos, Tiago Fernandes, Edilamar Menezes Oliveira, Carla Paulo Vieira, Carlos Adam Conte-Junior, Karen Jesus Oliveira, Antonio Claudio Lucas da Nóbrega
The renin-angiotensin system (RAS) has been implicated in the development of metabolic syndrome. We investigated whether the hepatic RAS is modulated by exercise training and if this modulation improves the deleterious effects of fructose overload in rats. Male Wistar rats were divided into (n = 8 each) control (CT), exercise control (CT-Ex), high fructose (HFr) and exercise high fructose (HFr-Ex) groups. Fructose-drinking rats received D-fructose (100 g L(-1) ). After two weeks, CT-Ex and HFr-Ex rats were assigned to a treadmill training protocol at moderate-intensity for eight weeks (60 min day(-1) , four days/week)...
June 19, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28625926/prenatal-caffeine-exposure-induced-high-susceptibility-to-metabolic-syndrome-in-adult-female-offspring-rats-and-its-underlying-mechanisms
#5
Lin-Guo Pei, Chao Yuan, Yi-Tian Guo, Hao Kou, Li-Ping Xia, Li Zhang, You-E Yan, Dan Xu, Hui Wang
Our previous studies have demonstrated that prenatal caffeine exposure (PCE) induced an intrauterine programming of hypothalamic-pituitary-adrenal axis (HPAA)-associated neuroendocrine metabolism in 3-month-old offspring rats. In this study, we aimed to confirm this programming disorder and high susceptibility to metabolic syndrome (MS) in 10-month-old female PCE offspring with postnatal catch-up growth. We found that PCE female offspring rats showed decreased bodyweight but a higher rate of weight gain after birth...
June 15, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28624654/insulin-signaling-an-opportunistic-target-to-minify-risk-of-alzheimer-s-disease
#6
REVIEW
Rohit Pardeshi, Nityanand Bolshette, Kundlik Gadhave, Ashutosh Ahire, Sahabuddin Ahmed, Tommaso Cassano, Veer Bala Gupta, Mangala Lahkar
Alzheimer's disease (AD) is progressive neurodegenerative disorder characterized by accumulation of senile plaques, neurofibrillary tangles (NFT) and neurodegeneration. The diabetes mellitus (DM) is one of the risk factors for AD pathogenesis by impairment in insulin signaling and glucose metabolism in central as well as peripheral system. Insulin resistance, impaired glucose and lipid metabolism lead to the Aβ (Aβ) aggregation, Tau phosphorylation, mitochondrial dysfunction, oxidative stress, protein misfolding, memory impairment and also mark over Aβ transport through central to peripheral and vice versa...
May 30, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28621759/a-high-fructose-high-coconut-oil-diet-induces-dysregulating-expressions-of-hippocampal-leptin-and-stearoyl-coa-desaturase-and-spatial-memory-deficits-in-rats
#7
Ching-I Lin, Chu-Fu Shen, Tsui-Han Hsu, Shyh-Hsiang Lin
We investigated the effects of high-fructose-high-fat diets with different fat compositions on metabolic parameters, hippocampal-dependent cognitive function, and brain leptin (as well as stearoyl-CoA desaturase (SCD1) mRNA expressions). Thirty-two male Wistar rats were divided into 3 groups, a control group (n = 8), a high-fructose soybean oil group (37.5% of fat calories, n = 12), and a high-fructose coconut oil group (37.5% of fat calories, n = 12) for 20 weeks. By the end of the study, the coconut oil group exhibited significantly higher serum fasting glucose, fructosamine, insulin, leptin, and triglyceride levels compared to those of the control and soybean oil groups...
June 16, 2017: Nutrients
https://www.readbyqxmd.com/read/28620495/familial-partial-lipodystrophy-and-proteinuric-renal-disease-due-to-a-missense-c-1045c%C3%A2-%C3%A2-t-lmna-mutation
#8
Athanasios Fountas, Zoe Giotaki, Evangelia Dounousi, George Liapis, Alexandra Bargiota, Agathocles Tsatsoulis, Stelios Tigas
Proteinuric renal disease is prevalent in congenital or acquired forms of generalized lipodystrophy. In contrast, an association between familial partial lipodystrophy (FPLD) and renal disease has been documented in very few cases. A 22-year-old female patient presented with impaired glucose tolerance, hyperinsulinemia, hirsutism and oligomenorrhea. On examination, there was partial loss of subcutaneous adipose tissue in the face, upper and lower limbs, bird-like facies with micrognathia and low set ears and mild acanthosis nigricans...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/28615381/yogurt-is-a-low-glycemic-index-food
#9
REVIEW
Thomas Ms Wolever
High yogurt intake is associated with a reduced risk of type 2 diabetes (T2DM). Although several mechanisms could explain this association, this paper addresses the glycemic and insulinemic impact of yogurt. There is evidence that low-glycemic index (GI) and low-glycemic load (GL) diets are associated with a reduced risk of T2DM. The 93 GI values for yogurt in the University of Sydney's GI database have a mean ± SD of 34 ± 13, and 92% of the yogurts are low-GI (≤55). The 43 plain yogurts in the database have a lower GI than the 50 sweetened yogurts, 27 ± 11 compared with 41 ± 11 (P < 0...
June 14, 2017: Journal of Nutrition
https://www.readbyqxmd.com/read/28608406/pregnancy-in-cadasil
#10
I Donnini, V Rinnoci, S Nannucci, R Valenti, F Pescini, G Mariani, S Bianchi, M T Dotti, A Federico, D Inzitari, L Pantoni
OBJECTIVES: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is an inherited cerebral small vessel disease caused by NOTCH3 gene mutations. CADASIL women are frequently considered at high risk of systemic vascular events during pregnancy and often prescribed with antithrombotic drugs. This decision is not evidence-based considering the lack of data about pregnancy outcome in CADASIL. We describe our experience on pregnancy in CADASIL patients...
June 12, 2017: Acta Neurologica Scandinavica
https://www.readbyqxmd.com/read/28606381/which-origin-for-polycystic-ovaries-syndrome-genetic-environmental-or-both
#11
Patrick Fenichel, Charlotte Rougier, Sylvie Hieronimus, Nicolas Chevalier
Polycystic ovaries syndrome (PCOS), the most common female endocrine disorder, affects 7-10% of women of childbearing age. It includes ovarian hyperandrogenism, impaired follicular maturation, anovulation and subfertility. Insulin resistance, although present in most cases, is not necessary for diagnosis. It increases hyperandrogenism and long-term metabolic, cardiovascular and oncological risks. The origin of hyperandrogenism and hyperinsulinemia has a genetic component, as demonstrated by familial aggregation studies and recent identification of associated genomic variants, conferring a particular susceptibility to the syndrome...
June 9, 2017: Annales D'endocrinologie
https://www.readbyqxmd.com/read/28604129/severe-hyperandrogenemia-in-postmenopausal-woman-as-a-presentation-of-ovarian-hyperthecosis-case-report-and-mini-review-of-the-literature
#12
Adam Czyzyk, Justyna Latacz, Dorota Filipowicz, Agnieszka Podfigurna, Rafal Moszynski, Piotr Jasinski, Stefan Sajdak, Michal Gaca, Andrea R Genazzani, Blazej Meczekalski
Ovarian hyperthecosis (OH) is characterized by the presence of abundant luteinized theca cells in ovaries that secret androgen. It typically presents as severe hyperandrogenism and/or virilization in postmenopausal woman. Here we describe a 66-year old woman with presentation of severe hirsutism, alopecia, clitoromegaly and laboratory finding of significantly elevated serum total testosterone concentration and hyperinsulinemia. Performed imaging studies revealed normal sized, homogeneous ovaries, signs of endometrial hypertrophy and normal adrenal glands...
June 11, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28600985/nox2-contributes-to-hyperinsulinemia-induced-redox-imbalance-and-impaired-vascular-function
#13
Abeer M Mahmoud, Mohamed M Ali, Edwin R Miranda, Jacob T Mey, Brian K Blackburn, Jacob M Haus, Shane A Phillips
Insulin resistance promotes vascular endothelial dysfunction and subsequent development of cardiovascular disease. Previously we found that skeletal muscle arteriolar flow-induced dilation (FID) was reduced following a hyperinsulinemic clamp in healthy adults. Therefore, we hypothesized that hyperinsulinemia, a hallmark of insulin resistance, contributes to microvascular endothelial cell dysfunction via inducing oxidative stress that is mediated by NADPH oxidase (Nox) system. We examined the effect of insulin, at levels that are comparable with human hyperinsulinemia on 1) FID of isolated arterioles from human skeletal muscle tissue in the presence and absence of Nox inhibitors and 2) human adipose microvascular endothelial cell (HAMECs) expression of nitric oxide (NO), endothelial NO synthase (eNOS), and Nox-mediated oxidative stress...
June 3, 2017: Redox Biology
https://www.readbyqxmd.com/read/28591087/hyperhomocysteinemia-as-a-metabolic-risk-factor-for-glucose-intolerance-among-high-risk-groups-of-chinese-adults
#14
Xiaomeng Feng, Yuan Xu
BACKGROUND Impaired glucose tolerance (IGT) is characterized by insulin resistance and causes atherosclerosis. Hyperhomocysteinemia is associated with insulin resistance and predicts cardiovascular diseases. In this study, we assessed the possible association between homocysteine and IGT. MATERIAL AND METHODS This was a cross-sectional study of 118 consecutive subjects with IGT (IGT group) and 128 consecutive subjects with normal glucose tolerance (NGT group). Homocysteine and clinical characteristics were measured...
June 7, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28588306/metabolomics-allow-the-discrimination-of-the-pathophysiological-relevance-of-hyperinsulinism-in-obese-prepubertal-children
#15
G Á Martos-Moreno, A Mastrangelo, V Barrios, A García, J A Chowen, F J Rupérez, C Barbas, J Argente
BACKGROUND/OBJECTIVES: Insulin resistance (IR) is the cornerstone of the obesity-associated metabolic derangements observed in obese children. Targeted metabolomics was employed to explore the pathophysiological relevance of hyperinsulinemia in childhood obesity in order to identify biomarkers of IR with potential clinical application. SUBJECTS/METHODS: One hundred prepubertal obese children (50 girls/50 boys, 50% IR and 50% non-IR in each group), underwent an oral glucose tolerance test for usual carbohydrate and lipid metabolism determinations...
June 7, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28580288/restoration-of-lepr-in-%C3%AE-cells-of-lepr-null-mice-does-not-prevent-hyperinsulinemia-and-hyperglycemia
#16
Anna M D'souza, Timothy J Kieffer
OBJECTIVE: The adipose-derived hormone leptin plays an important role in regulating body weight and glucose homeostasis. Leptin receptors are expressed in the central nervous system as well as peripheral tissues involved in regulating glucose homeostasis, including insulin-producing β cells of the pancreas. Previous studies assessing the role of leptin receptors in β cells used Cre-loxP to disrupt the leptin receptor gene (Lepr) in β cells, but variable results were obtained. Furthermore, recombination of Lepr was observed in the hypothalamus or exocrine pancreas, in addition to the β cells, and Lepr in non-β cells may have compensated for the loss of Lepr in β cells, thus making it difficult to assess the direct effects of Lepr in β cells...
June 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/28575154/effects-of-propylene-glycol-or-elevated-lh-during-follicle-development-on-ovulation-fertilization-and-early-embryo-development
#17
Katherine S Hackbart, Robb W Bender, Paulo D Carvalho, Lais M Vieira, Ana R Dresch, Jerry N Guenther, Hidir Gencoglu, Anibal B Nascimento, Randy D Shaver, Milo C Wiltbank
Seventeen non-lactating Holstein cows were superovulated in a Latin-square designed experiment to determine effects of increased propylene glycol (PROP) and LH during antral follicle development on ovarian function, fertilization, and early embryo quality. PROP was orally drenched every 4 h for 7d to induce hyperinsulinemia and associated metabolic changes. LH concentrations were altered by increasing LH (3-fold) during last 2 d of superovulation. Treatment groups were: 1) Control-oral drenching with water plus low-LH preparation; 2) HLH-water plus high-LH preparation; 3) PROP-drenching with PROP plus low-LH; 4) PROP/HLH-PROP plus high-LH...
May 30, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28575111/the-role-of-insulin-resistance-in-experimental-diabetic-retinopathy-genetic-and-molecular-aspects
#18
Patrick Järgen, Axel Dietrich, Andreas W Herling, Hans-Peter Hammes, Paulus Wohlfart
BACKGROUND: Diabetic retinopathy is characterized by defects in the retinal neurovascular unit. The underlying mechanisms of impairment-including reactive intermediates and growth-factor dependent signalling pathways and their possible interplay are incompletely understood. This study aims to assess the relative role of hyperglycemia and hyperinsulinemia alone or in combination on the gene expression patterning in the retina of animal models of diabetes. MATERIAL AND METHODS: As insulinopenic, hyperglycemic model reflecting type 1 diabetes, male STZ-Wistar rats (60mg/kg BW; i...
2017: PloS One
https://www.readbyqxmd.com/read/28569090/insulin-differentially-affects-the-distribution-kinetics-of-amyloid-beta-40-and-42-in-plasma-and-brain
#19
Suresh Kumar Swaminathan, Kristen M Ahlschwede, Vidur Sarma, Geoffry L Curran, Rajesh S Omtri, Teresa Decklever, Val J Lowe, Joseph F Poduslo, Karunya K Kandimalla
Impaired brain clearance of amyloid-beta peptides (Aβ) 40 and 42 across the blood-brain barrier (BBB) is believed to be one of the pathways responsible for Alzheimer's disease (AD) pathogenesis. Hyperinsulinemia prevalent in type II diabetes was shown to damage cerebral vasculature and increase Aβ accumulation in AD brain. However, there is no clarity on how aberrations in peripheral insulin levels affect Aβ accumulation in the brain. This study describes, for the first time, an intricate relation between plasma insulin and Aβ transport at the BBB...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28562254/intractable-hypoglycemia-in-the-setting-of-autoimmune-overlap-syndrome
#20
Kanika Shanker, Tanicia Daley, Robert Semple, Kelly Rouster-Stevens, J Nina Ham
Evaluation of hypoglycemia in a patient with known diabetes mellitus, although usually straightforward, can at times be challenging. We present the case of an 8 year-old Latina girl initially diagnosed with type 1 diabetes mellitus in the setting of multiple autoimmune disorders, including dermatomyositis and lupus nephritis. She subsequently developed signs of insulin resistance and severe hypoglycemia, which was found to be due to insulin-receptor autoantibodies. This condition, known as type B insulin resistance, is a rare, heterogeneous metabolic disease that may feature hypoglycemia in the setting of extreme insulin resistance and hyperinsulinemia and, in this case, masqueraded as type 1 diabetes mellitus...
May 10, 2017: Pediatrics
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