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Insuline resistance

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https://www.readbyqxmd.com/read/28551889/maternal-magnesium-restriction-elevates-glucocorticoid-stress-and-inflammation-in-the-placenta-and-fetus-of-wnin-rat-dams
#1
Anju Elizabeth Thomas, Padmavathi J N Inagadapa, Sugeetha Jeyapal, Naga Muralidhar Merugu, Rajender Rao Kalashikam, Raghunath Manchala
Magnesium plays a major role in many vital functions in the body. We reported earlier that maternal magnesium restriction altered body composition, fat metabolism, and insulin resistance in WNIN rat offspring and was associated with increased glucocorticoid stress in the offspring in their later life. We hypothesize that increased glucocorticoid stress and inflammation which originate in Mg restricted rat dams is transmitted through placenta to the fetus and underlie the metabolic disturbances in the later life of the offspring...
May 27, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28551880/the-role-of-mkp-1-in-insulin-induced-cardioprotection
#2
Ingrid Webster, Angelique Smith, Amanda Lochner, Barbara Huisamen
PURPOSE: The mitogen-activated protein kinase phosphatases (MKPs) are a family of dual-specificity phosphatases that inactivate MAPKs by dephosphorylation. Impairment of MKP-1 expression in insulin resistance has been suggested to affect the cardioprotective properties of insulin. We hypothesized that manipulation of its activity during myocardial ischaemia/reperfusion of control as well as insulin-resistant rats may affect the outcome. METHODS: Hearts from 16 week dietary induced obese Wistar rats and their age matched controls were isolated, perfused in the working mode and subjected to 15 min global ischaemia / 30 min reperfusion or 35 min coronary artery ligation/ 60 min reperfusion...
May 27, 2017: Cardiovascular Drugs and Therapy
https://www.readbyqxmd.com/read/28551830/factors-responsible-for-obesity-related-hypertension
#3
REVIEW
Kyungjoon Lim, Kristy L Jackson, Yusuke Sata, Geoffrey A Head
PURPOSE OF REVIEW: The major health issue of being overweight or obese relates to the development of hypertension, insulin resistance and diabetic complications. One of the major underlying factors influencing the elevated blood pressure in obesity is increased activity of the sympathetic nerves to particular organs such as the kidney. RECENT FINDINGS: There is now convincing evidence from animal studies that major signals such as leptin and insulin have a sympathoexcitatory action in the hypothalamus to cause hypertension...
July 2017: Current Hypertension Reports
https://www.readbyqxmd.com/read/28551803/insulin-resistance-and-mitochondrial-dysfunction
#4
Alba Gonzalez-Franquesa, Mary-Elizabeth Patti
Insulin resistance precedes and predicts the onset of type 2 diabetes (T2D) in susceptible humans, underscoring its important role in the complex pathogenesis of this disease. Insulin resistance contributes to multiple tissue defects characteristic of T2D, including reduced insulin-stimulated glucose uptake in insulin-sensitive tissues, increased hepatic glucose production, increased lipolysis in adipose tissue, and altered insulin secretion. Studies of individuals with insulin resistance, both with established T2D and high-risk individuals, have consistently demonstrated a diverse array of defects in mitochondrial function (i...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28551720/effect-of-paricalcitol-on-pancreatic-oxidative-stress-inflammatory-markers-and-glycemic-status-in-diabetic-rats
#5
T M Ali, B El Esawy, A Elaskary
OBJECTIVES: This study is designed to explore the effect of paricalcitol (vitamin D receptor agonist) on pancreatic oxidative stress, inflammatory markers, and adiponectin and glycemic status in diabetic rats. MATERIALS AND METHODS: Forty Sprague-Dawley male rats aged 10-12 weeks (150-250 g) were used in this study. Type 2 diabetes was developed by providing 4 weeks of high-fat-diet feeding before one shot of streptozotocin injection (40 mg/kg i.p.). Four study groups were designed as normal control rats, diabetic control vehicle-treated, diabetic paricalcitol-treated (0...
May 27, 2017: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/28551627/the-cooh-terminus-of-the-igf-1ec-isoform-enhances-the-proliferation-and-migration-of-human-mcf-7-breast-cancer-cells
#6
Panagiotis F Christopoulos, Efstathia Papageorgiou, Constantina Petraki, Michael Koutsilieris
BACKGROUND/AIM: The insulin-like growth factor-1 (IGF-1) signaling is well implicated in cancer biology, however the potential roles of the distinct IGF-1 isoforms in human malignancies are largely unknown. Recently, the carboxyl-terminal of the IGF-1Ec variant (hEc; 24aa) has been associated with osteosarcoma and prostate cancer. Herein, we investigated the potential role of hEc in breast cancer. MATERIALS AND METHODS: Synthetic hEc peptide was administrated to MCF-7 and MDA-MB-231 breast cancer cells...
June 2017: Anticancer Research
https://www.readbyqxmd.com/read/28551552/standardized-mori-ramulus-extract-improves-insulin-secretion-and-insulin-sensitivity-in-c57blks-j-db-db-mice-and-ins-1-cells
#7
Soo-Yeon Park, Bora Jin, Jae-Ho Shin, Sirichai Adisakwattana, Oran Kwon
Abnormalities in the hyperbolic relationship between insulin sensitivity and insulin secretion may cause oxidative stress and non-enzymatic glycation, resulting in an increased risk of type 2 diabetes. Here, we performed a 14-week study to investigate the effects of ethanolic extract of Mori ramulus (MRE; 0, 800, and 1600mg/kg body weight) and its signature component oxyresveratrol (OXY; 800mg/kg body weight) on β-cell dysfunction and insulin resistance in C57BLKS/J db/db mice fed with a high-fat diet. Compared with the diabetic control group, the high-dose MRE group showed a significant decrease in fasting blood glucose (p=0...
May 25, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28551355/roles-of-diacylglycerols-and-ceramides-in-hepatic-insulin-resistance
#8
REVIEW
Max C Petersen, Gerald I Shulman
Although ample evidence links hepatic lipid accumulation with hepatic insulin resistance, the mechanistic basis of this association is incompletely understood and controversial. Diacylglycerols (DAGs) and ceramides have emerged as the two best-studied putative mediators of lipid-induced hepatic insulin resistance. Both lipids were first associated with insulin resistance in skeletal muscle and were subsequently hypothesized to mediate insulin resistance in the liver. However, the putative roles for DAGs and ceramides in hepatic insulin resistance have proved more complex than originally imagined, with various genetic and pharmacologic manipulations yielding a vast and occasionally contradictory trove of data to sort...
May 24, 2017: Trends in Pharmacological Sciences
https://www.readbyqxmd.com/read/28551162/association-of-sympathovagal-imbalance-with-cognitive-impairment-in-type-2-diabetes
#9
Pal Auroprajna, Basanta Manjari Naik, Jaya Prakash Sahoo, Gorantla Shravya Keerthi, Manohar Pavanya, Gopal Krushna Pal
OBJECTIVE: Sympathovagal imbalance (SVI) has been reported to be associated with metabolic derangements in type 2 diabetes. We investigated the association of SVI with cognitive impairment in patients with type 2 diabetes. METHODS: Patients with a new diagnosis of type 2 diabetes (n=43) and age-matched healthy control subjects (n=43) were recruited for the study. Body mass index and blood pressure measurements were recorded. SVI was assessed by spectral analysis of heart rate variability (HRV), and cognitive function was assessed by recording the positive wave that appears in 300 milliseconds from application of stimulus in event-related potential tracing (P300)...
May 24, 2017: Canadian Journal of Diabetes
https://www.readbyqxmd.com/read/28550439/baseline-anthropometric-and-metabolic-parameters-correlate-with-weight-loss-in-women-1-year-after-laparoscopic-roux-en-y-gastric-bypass
#10
Sans Arnaud, Bailly Laurent, Anty Rodolphe, Sielezenef Igor, Gugenheim Jean, Tran Albert, Gual Philippe, Iannelli Antonio
BACKGROUND: In this study, we explored in a prospective cohort of morbidly obese women undergoing laparoscopic Roux-en-Y gastric bypass (LRYGP) correlations between baseline anthropometrics, metabolic parameters, resting energy expenditure (REE), body composition, and 1-year % excess body mass index loss (%EBMIL). We also investigated risk factors for insufficient %EBMIL. METHODS: One hundred three consecutive women were prospectively evaluated at baseline (age 40...
May 26, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/28550272/non-alcoholic-fatty-liver-disease-a-chronic-disease-of-the-21-st-century
#11
Metrakos Peter, Nilsson Tommy
Non-alcoholic fatty liver disease (NAFLD) comprises a spectrum of metabolic states ranging from simple steatosis to inflammation with associated fibrosis to cirrhosis. Though accumulation of hepatic fat is not associated with a significant increase in mortality rates, hepatic inflammation is, as this augments the risk of terminal liver disease, i.e., cirrhosis, hepatic decompensation (liver failure) and/or hepatocellular carcinoma. Disease progression is usually slow, over a decade or more and, for the most part, remains asymptomatic...
May 26, 2017: Journal of Biomedical Research
https://www.readbyqxmd.com/read/28550261/effect-of-apoe-%C3%AE%C2%B54-genotype-on-metabolic-biomarkers-in-aging-and-alzheimer-s-disease
#12
Jill Morris K, Roxanne Adeline Z Uy, Eric D Vidoni, Heather M Wilkins, Ashley E Archer, John P Thyfault, John M Miles, Jeffrey M Burns
Alzheimer's disease (AD) may have heterogeneous pathophysiological underpinnings, with risk factors including apolipoprotein rmvarep4 (APOE4) genotype and insulin resistance. We hypothesized that distinct phenotypes exist within AD. We examined APOE4 and metabolic biomarkers in 338 subjects (n = 213 nondemented (ND), n = 125 AD). We further characterized steady state free fatty acid (FFA) levels in a subset of 45 participants who had also participated in a hyperinsulinemic-euglycemic clamp. Insulin resistance (HOMA-IR) was elevated in AD versus ND (p = 0...
May 25, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28550243/apomorphine-therapy-for-neuronal-insulin-resistance-in-a-mouse-model-of-alzheimer-s-disease
#13
Norimichi Nakamura, Yasumasa Ohyagi, Tomohiro Imamura, Yuki T Yanagihara, Kyoko M Iinuma, Naoko Soejima, Hiroyuki Murai, Ryo Yamasaki, Jun-Ichi Kira
Apomorphine (APO) promotes intraneuronal amyloid-β (Aβ) degradation and improves memory function in an Alzheimer's disease (AD) model, 3xTg-AD mice. Since insulin resistance is increased in AD neurons, we investigated the effects of APO on brain insulin resistance in 3xTg-AD mice at early and late stages. After 1-month subcutaneous injection of Apokyn® to 3xTg-AD mice at 6 or 12 months of age, memory function was significantly improved in both age groups. Protein levels of insulin-degrading enzyme (IDE), which is linked to insulin signaling and degrades Aβ, significantly increased in the 3xTg-AD mice brain compared with non-transgenic mice, and were further increased by APO...
May 25, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28550108/hypothalamic-ventromedial-lin28a-enhances-glucose-metabolism-in-diet-induced-obesity
#14
Jung Dae Kim, Chitoku Toda, Cristina M Ramírez, Carlos Fernández-Hernando, Sabrina Diano
The Lin28a/Let-7 axis has been studied in peripheral tissues for its role in metabolism regulation. However, its central function remains unclear. Here we found that Lin28a is highly expressed in the hypothalamus compared to peripheral tissues. Its expression is positively correlated with positive energy balance, suggesting a potential central role for Lin28a in metabolism regulation. Thus, we targeted the hypothalamic ventromedial nucleus (VMH) to selectively overexpress (Lin28aKI(VMH) ) or downregulate (Lin28aKD(VMH) ) Lin28a expression in mice...
May 26, 2017: Diabetes
https://www.readbyqxmd.com/read/28549989/overweight-in-elderly-people-induces-impaired-autophagy-in-skeletal-muscle
#15
Yaiza Potes, Beatriz de Luxán-Delgado, Susana Rodriguez-González, Marcela Rodrigues Moreira Guimarães, Juan J Solano, María Fernández-Fernández, Manuel Bermúdez, Jose A Boga, Ignacio Vega-Naredo, Ana Coto-Montes
Sarcopenia is the gradual loss of skeletal muscle mass, strength and quality associated with aging. Changes in body composition, especially in skeletal muscle and fat mass are crucial steps in the development of chronic diseases. We studied the effect of overweight on skeletal muscle tissue in elderly people without reaching obesity to prevent this extreme situation. Overweight induces a progressive protein breakdown reflected as a progressive withdrawal of anabolism against the promoted catabolic state leading to muscle wasting...
May 23, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28549558/the-kv1-3-channel-blocker-vm24-enhances-muscle-glucose-transporter-4-mobilization-but-does-not-reduce-body-weight-gain-in-diet-induced-obese-male-rats
#16
Lorraine Jaimes-Hoy, Georgina B Gurrola, Miguel Cisneros, Patricia Joseph-Bravo, Lourival D Possani, Jean-Louis Charli
AIMS: Voltage-gated potassium channels 1.3 (Kv1.3) can be targeted to reduce diet-induced obesity and insulin resistance in mice. Since species-specific differences in Kv1.3 expression and pharmacology have been observed, we tested the effect of Vm24, a high-affinity specific blocker of Kv1.3 channels from Vaejovis mexicanus smithi, on body weight (BW), glucose tolerance and insulin resistance in diet-induced obese rats. MATERIALS AND METHODS: Young adult male Wistar rats were switched to a high-fat/high-fructose (HFF) diet...
May 23, 2017: Life Sciences
https://www.readbyqxmd.com/read/28549065/c-elegans-daf-16-foxo-interacts-with-tgf-%C3%A3-bmp-signaling-to-induce-germline-tumor-formation-via-mtorc1-activation
#17
Wenjing Qi, Yijian Yan, Dietmar Pfeifer, Erika Donner V Gromoff, Yimin Wang, Wolfgang Maier, Ralf Baumeister
Activation of the FOXO transcription factor DAF-16 by reduced insulin/IGF signaling (IIS) is considered to be beneficial in C. elegans due to its ability to extend lifespan and to enhance stress resistance. In the germline, cell-autonomous DAF-16 activity prevents stem cell proliferation, thus acting tumor-suppressive. In contrast, hypodermal DAF-16 causes a tumorous germline phenotype characterized by hyperproliferation of the germline stem cells and rupture of the adjacent basement membrane. Here we show that cross-talk between DAF-16 and the transforming growth factor ß (TGFß)/bone morphogenic protein (BMP) signaling pathway causes germline hyperplasia and results in disruption of the basement membrane...
May 26, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28548186/-cardiovascular-risk-factors-among-first-and-third-year-university-students
#18
Gladys Morales, Francisco Guillen-Grima, Sergio Muñoz, Carlos Belmar, Ingrid Schifferli, Andrea Muñoz, Alvaro Soto
BACKGROUND: College students are in a critical stage in their life style due to the transition between high school and university and they may be prone to develop cardiovascular diseases. AIM: To compare the prevalence of cardiovascular risk factors (CVRF) in students from first and third year at the University of La Frontera, Temuco-Chile, according to faculty, gender and socioeconomic status (SES). MATERIAL AND METHODS: Cross-sectional study...
March 2017: Revista Médica de Chile
https://www.readbyqxmd.com/read/28547918/exercise-with-weight-loss-improves-adipose-tissue-and-skeletal-muscle-markers-of-fatty-acid-metabolism-in-postmenopausal-women
#19
Heidi K Ortmeyer, Andrew P Goldberg, Alice S Ryan
OBJECTIVE: The effects of 6-month weight loss (WL) versus aerobic exercise training (AEX)+WL on fat and skeletal muscle markers of fatty acid metabolism were determined in normal (NGT) and impaired (IGT) glucose tolerant African-American and Caucasian postmenopausal women with overweight/obesity. METHODS: Fat (gluteal and abdominal) lipoprotein lipase (LPL), skeletal muscle LPL, acyl-CoA synthase (ACS), ß-hydroxacyl-CoA dehydrogenase, carnitine palmitoyltransferase (CPT-1), and citrate synthase (CS) activities were measured at baseline (n = 104) and before and after WL (n = 34) and AEX+WL (n = 37)...
May 26, 2017: Obesity
https://www.readbyqxmd.com/read/28546817/clinical-and-biochemical-characteristics-in-pcos-women-with-menstrual-abnormalities
#20
Vasiliki Christodoulopoulou, Eftihios Trakakis, Vasilios Pergialiotis, Melpomeni Peppa, Charalampos Chrelias, Dimitrios Kassanos, Nikolaos Papantoniou
Objective: The purpose of the present study was to examine the impact of menstrual cycle abnormalities among patients with polycystic ovary syndrome (PCOS) on biochemical and anthropometric characteristics. Materials and methods: We conducted a prospective observational study of patients 17-35 years of age with PCOS that attended the department of Gynecological Endocrinology of our hospital. Results: A total of 309 women with PCOS participated in the study. In total, 72.2% suffered from menstrual cycle disorders...
December 2016: Journal of Family & Reproductive Health
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