scholarly journals Effects of Overexpression of Neurosecretory Protein GL-Precursor Gene on Glucose Homeostasis and Insulin Sensitivity in Mice

2021 ◽  
Vol 22 (9) ◽  
pp. 4681
Author(s):  
Keisuke Fukumura ◽  
Yuki Narimatsu ◽  
Shogo Moriwaki ◽  
Eiko Iwakoshi-Ukena ◽  
Megumi Furumitsu ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Blood Glucose ◽  
Insulin Sensitivity ◽  
Glucose Homeostasis ◽  
Mass Gain ◽  
Tolerance Test ◽  
Oral Glucose ◽  
Insulin Levels ◽  
Glucose Levels ◽  
Increase Food Intake

A high-fat diet (HFD) quickly induces obesity with insulin resistance and hyperglycemia. We previously reported that a novel hypothalamic small protein, named neurosecretory protein GL (NPGL), stimulates feeding and fat accumulation in mice. However, the effects of NPGL on insulin sensitivity and glucose homeostasis remain unknown. Hence, we subjected NPGL-precursor gene (Npgl)-overexpressing mice to the oral glucose tolerance test (OGTT) and intraperitoneal insulin tolerance test (IPITT) under normal chow (NC) and HFD conditions. Npgl overexpression promoted body mass gain and tended to increase food intake of NC-fed mice, whereas it had little effect on HFD-fed mice. The OGTT showed elevated blood glucose and insulin levels in Npgl-overexpressing NC-fed mice 15 min after glucose administration. Both the OGTT and IPITT demonstrated that Npgl overexpression decreased blood glucose levels in HFD-fed mice 60 min after glucose and insulin treatments. Notably, Npgl overexpression increased adipose tissue masses only in NC-fed mice, and it decreased blood glucose and insulin levels in HFD-fed mice at the experimental end point. It also increased the mRNA expression of galanin, one of the feeding and metabolic regulatory neuropeptides, in the hypothalamus of HFD-fed mice. Therefore, NPGL may alleviate HFD-induced hyperglycemia and insulin resistance in mice.

Lack of effect of oral glucose loading on conduit vessel endothelial function in healthy subjects

2004 ◽  
Vol 107 (2) ◽  
pp. 191-196 ◽  
Author(s):  
Aris SIAFARIKAS ◽  
Katie WATTS ◽  
Petra BEYE ◽  
Timothy W. JONES ◽  
Elizabeth A. DAVIS ◽  
...  
Keyword(s):  
Blood Glucose ◽  
Vascular Function ◽  
Healthy Subjects ◽  
Glycated Haemoglobin ◽  
Tolerance Test ◽  
Oral Glucose ◽  
Insulin Levels ◽  
Glucose Levels ◽  
The Impact

The aim of the present study was to investigate the impact of an oral glucose load on circulating insulin and glucose levels and arterial function in healthy non-diabetic subjects. Thirty-nine non-obese, healthy subjects (24 female, 15 male), aged 21.0±1.8 years of age, were randomly assigned to undergo either an OGTT (oral glucose tolerance test; 75 g of glucose) or administration of a placebo. Analyses of lipids, liver function and HbA1c (glycated haemoglobin) at baseline revealed results which were within the standard reference range. Insulin and glucose levels as well as vascular function [FMD (flow-mediated dilation)] were measured at 0, 60 and 120 min. Compared with baseline, the control subjects did not exhibit any significant changes in glucose or insulin levels, whereas, in the OGTT group, blood glucose levels at both 60 (5.4±1.7 mmol/l) and 120 (5.0±1.1 mmol/l) min increased significantly relative to baseline (4.1±0.4 mmol/l; both P<0.001) and, similarly, insulin levels were higher at both 60 (30.1±21.3 m-units/l) and 120 (34.9±23.6 m-units/l) min compared with baseline (4.7±4.3 m-units/l; both P<0.001). Although blood glucose and insulin levels changed, FMD did not significantly differ between time-points or between groups. In summary, despite significantly elevated glucose and insulin concentrations in these subjects, we observed no change in vascular function, suggesting that acute elevations of glucose and insulin within the clinically normal range are not associated with impaired vascular function in vivo.

scholarly journals Suppression of Prolactin Secretion Partially Explains the Antidiabetic Effect of Bromocriptine in ob/ob Mice

Endocrinology ◽  
2018 ◽  
Vol 160 (1) ◽  
pp. 193-204 ◽  
Author(s):  
Isadora C Furigo ◽  
Miriam F Suzuki ◽  
João E Oliveira ◽  
Angela M Ramos-Lobo ◽  
Pryscila D S Teixeira ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Blood Glucose ◽  
Insulin Sensitivity ◽  
Glucose Homeostasis ◽  
Prolactin Secretion ◽  
Dopamine Receptor Agonist ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Insulin Tolerance ◽  
Promising Therapeutic Approach

Abstract Previous studies have shown that bromocriptine mesylate (Bromo) lowers blood glucose levels in adults with type 2 diabetes mellitus; however, the mechanism of action of the antidiabetic effects of Bromo is unclear. As a dopamine receptor agonist, Bromo can alter brain dopamine activity affecting glucose control, but it also suppresses prolactin (Prl) secretion, and Prl levels modulate glucose homeostasis. Thus, the objective of the current study was to investigate whether Bromo improves insulin sensitivity via inhibition of Prl secretion. Male and female ob/ob animals (a mouse model of obesity and insulin resistance) were treated with Bromo and/or Prl. Bromo-treated ob/ob mice exhibited lower serum Prl concentration, improved glucose and insulin tolerance, and increased insulin sensitivity in the liver and skeletal muscle compared with vehicle-treated mice. Prl replacement in Bromo-treated mice normalized serum Prl concentration without inducing hyperprolactinemia. Importantly, Prl replacement partially reversed the improvements in glucose homeostasis caused by Bromo treatment. The effects of the Prl receptor antagonist G129R-hPrl on glucose homeostasis were also investigated. We found that central G129R-hPrl infusion increased insulin tolerance of male ob/ob mice. In summary, our findings indicate that part of Bromo effects on glucose homeostasis are associated with decrease in serum Prl levels. Because G129R-hPrl treatment also improved the insulin sensitivity of ob/ob mice, pharmacological compounds that inhibit Prl signaling may represent a promising therapeutic approach to control blood glucose levels in individuals with insulin resistance.

scholarly journals Anti-diabetic and Anti-oxidant Effects of Methanolic Flower Head Extract of Tagetes patula in Streptozotocin and Dexamethasone Induced Diabetic Rats

2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Ganga Raju M. ◽  
Gayathri S ◽  
Suvarchala Reddy V N V L ◽  
Anusha K ◽  
Pavani K
Keyword(s):  
Insulin Resistance ◽  
Blood Glucose ◽  
Glucose Tolerance Test ◽  
Methanolic Extract ◽  
Tolerance Test ◽  
Oral Glucose ◽  
Tagetes Patula ◽  
Oral Glucose Tolerance ◽  
Glucose Levels ◽  
Blood Glucose Levels

Diabetes is a chronic metabolic disorder characterized by a high blood glucose concentration, i.e., hyperglycemia or caused by insulin deficiency, often combined with insulin resistance. In the Present study, the antidiabetic and antioxidant activity of the methanolic extract of Tagetes patula flower heads was screened out in rodent models. The pharmacological evaluation was carried out using 200 and 400 mg/kg, b.w. The in-vivo antidiabetic activity was performed in streptozotocin, dexamethasone-induced diabetic models and oral glucose tolerance test. Metformin hydrochloride was used as a standard. The parameters like blood glucose levels, insulin levels, homeostasis assessment of insulin resistance, insulin sensitivity, and fasting glucose-insulin ratio were estimated in these models. The in-vitro antioxidant activity of methanolic extract of Tagetes patula was performed by using hydroxyl radical scavenging assay and Ascorbic acid was used as a standard. The preliminary phytochemical screening of Tagetes patula revealed the presence of phytoconstituents like alkaloids, flavonoids, saponins, steroids, phenols, carbohydrates, triterpenoids, and tannins. The extract showed a significant decrease in the elevated blood glucose levels in streptozotocin, dexamethasone-induced diabetic models, and also in the oral glucose tolerance test. The extract prevented insulin resistance and significantly increased insulin sensitivity in the dexamethasone-induced model. The various phytochemical constituents like alkaloids, flavonoids, saponins, steroids, and phenols might be responsible for lowering the blood glucose levels in the animal models mentioned above. The extract showed significant scavenging activity against hydroxyl free radicals. From the above outcomes, it is flawless that the methanolic extract of Tagetes patula has antidiabetic and antioxidant activities.

THE EFFECT OF THE PROGESTOGEN ETHYNODIOL DIACETATE ON GLUCOSE, INSULIN, AND GROWTH HORMONE AFTER SIX MONTHS TREATMENT

1972 ◽  
Vol 70 (2) ◽  
pp. 373-384 ◽  
Author(s):  
W. N. Spellacy ◽  
W. C. Buhi ◽  
S. A. Birk
Keyword(s):  
Growth Hormone ◽  
Blood Glucose ◽  
Plasma Insulin ◽  
Tolerance Test ◽  
Metabolic Effects ◽  
Oral Glucose ◽  
Hormone Levels ◽  
Glucose Levels ◽  
Ethynodiol Diacetate ◽  
Tolerance Curve

ABSTRACT Seventy-one women were treated with a daily dose of 0.25 mg of the progestogen ethynodiol diacetate. They were all tested with a three-hour oral glucose tolerance test before beginning the steroid and then again during the sixth month of use. Measurements were made of blood glucose and plasma insulin and growth hormone levels. There was a significant elevation of the blood glucose levels after steroid treatment as well as a deterioration in the tolerance curve in 12.9% of the women. The plasma insulin values were also elevated after drug treatment whereas the fasting ambulatory growth hormone levels did not significantly change. There was a significant association between the changes in glucose and insulin levels and the subject's age, control weight, or weight gain during treatment. The importance of considering the metabolic effects of the progestogen component of oral contraceptives is stressed.

Antidiabetic Effect of Aqueous Corrigiola telephiifolia in Streptozotocin- Induced Diabetic Rats

2020 ◽  
Vol 10 (1) ◽  
pp. 61-68 ◽  
Author(s):  
Morad Hebi ◽  
Mohamed Eddouks
Keyword(s):  
Blood Glucose ◽  
Glucose Tolerance Test ◽  
Tolerance Test ◽  
Diabetic Rats ◽  
Oral Glucose ◽  
Oral Glucose Tolerance ◽  
Phytochemical Screening ◽  
Antidiabetic Effect ◽  
Glucose Levels ◽  
Blood Glucose Levels

Background: Corrigiola telephiifolia Pourr, is a perennial species, woody distributed throughout the north of Africa. This plant is used in traditional Mediterranean preparations and has many traditional uses especially treatment of diabetes. Aim/Methods: The current research was carried out to evaluate the antidiabetic effect of Aerial Parts of Aqueous Extract (APAE) of Corrigiola telephiifolia (C. telephiifolia) on both normal and streptozotocin (STZ)-induced diabetic rats treated at a dose of 5 mg/kg for fifteen days. Additionally, the histopathological changes in the liver, morphometric analysis, Oral Glucose Tolerance Test (OGTT) in normal rats and preliminary phytochemical screening for various components were realized. Results: Single oral administration of the APAE of C. telephiifolia (5mg/kg) showed no significant change in glycaemia of normal and STZ-induced diabetic rats. In contrast, repeated oral administration of C. telephiifolia reduced blood glucose levels from 4.11 ± 0.10 mmol/L to 3.16 ± 0.16 mmol/L (p<0.01) 15 days after administration in normal rats. Furthermore, blood glucose levels decreased from 17.84 ± 1.75mmol/L to 1.93 ± 0.33 mmol/L (p<0.0001) in STZ diabetic rats after fifteen days of treatment. According to the oral glucose tolerance test, C. telephiifolia (5 mg/kg) was shown to prevent significantly the increase in blood glucose levels in normal treated rats 30 min after glucose administration when compared to the control group. Also, the liver architecture of diabetic rats treated by C. telephiifolia was improved when compared with the liver architecture of untreated diabetic rats. Concerning the preliminary phytochemical screening of C. telephiifolia, several compounds have been found such as polyphenols, flavonoids, saponins, mucilage and terpenoids. Conclusion: The results show that the aqueous extract of C. telephiifolia possesses significant antihyperglycemic activity.

scholarly journals Parameters of Glucose Homeostasis in the Recognition of the Metabolic Syndrome in Young Adults with Prader–Willi Syndrome

2021 ◽  
Vol 10 (23) ◽  
pp. 5635
Author(s):  
Graziano Grugni ◽  
Antonio Fanolla ◽  
Fiorenzo Lupi ◽  
Silvia Longhi ◽  
Antonella Saezza ◽  
...  
Keyword(s):  
Metabolic Syndrome ◽  
Glucose Homeostasis ◽  
Tolerance Test ◽  
Oral Glucose ◽  
Prader Willi Syndrome ◽  
Insulinogenic Index ◽  
Glucose Levels ◽  
The Metabolic Syndrome ◽  
Diagnostic Threshold ◽  
Age Related

To verify the accuracy of different indices of glucose homeostasis in recognizing the metabolic syndrome in a group of adult patients with Prader–Willi syndrome (PWS), 102 PWS patients (53 females/49 males), age ±SD 26.9 ± 7.6 yrs, Body Mass Index (BMI) 35.7 ± 10.7, were studied. The following indices were assessed in each subject during an oral glucose tolerance test (OGTT): 1 h (>155 mg/dL) and 2 h (140–199 mg/dL) glucose levels, the oral disposition index (ODI), the insulinogenic index (IGI), the insulin resistance (HOMA-IR) were evaluated at baseline, 1 h and 2 h. Although minor differences among indices were found, according to the ROC analysis, no index performed better in recognizing MetS. Furthermore, the diagnostic threshold levels changed over the years and therefore the age-related thresholds were calculated. The easily calculated HOMA-IR at baseline may be used to accurately diagnose MetS, thus avoiding more complicated procedures.

scholarly journals A Nutraceutical Combination of Cinnamon, Purple Onion, and Tea Linked with Key Enzymes on Treatment of Type 2 Diabetes

2021 ◽  
Author(s):  
Lebin Weng ◽  
Ting-Hsu Chen ◽  
Liyue Huang ◽  
Dong Lai ◽  
Yaw-Syan Fu ◽  
...  
Keyword(s):  
Blood Glucose ◽  
Glucose Tolerance Test ◽  
Tolerance Test ◽  
Maximal Response ◽  
Oral Glucose ◽  
Postprandial Plasma Glucose ◽  
Glucose Levels ◽  
High Fructose ◽  
Tea Extract

Abstract Background: Diabetes mellitus (DM) is concomitant with significant morbidity and mortality and its prevalence is accumulative worldwide. The conventional antidiabetic agents are known to mitigate the symptoms of diabetes; however, they may also cause adverse effects. This study explores the efficacy of polyherbal dietary supplement cinnamon, purple onion, and tea on the mediation of postprandial hyperglycemia for in the search of combinations with a maximal response. Materials and methods: A starch solution (3 g/kg Bwt) of oral starch tolerance test (OSTT) and glucose solution (4 g/kg Bwt) of oral glucose tolerance test (OGTT) with and without cinnamon, purple onion, tea extract (15 mg/kg Bwt), and mixture (each 5 mg/kg Bwt, 1:1:1), metformin (14 mg/kg Bwt), or acarbose (50 mg/kg Bwt) was administered to high fat plus high fructose-induced diabetic mice after an overnight fast. Postprandial plasma glucose levels were measured and incremental areas under the response curve were calculated. Results: Compared with acarbose, the mixture of extracts (purple onion, cinnamon, and tea) indicated decreasing blood glucose in OSTT. In OGTT, the mixture of extracts showed greater efficacy for hypoglycemia when compared with metformin. The molecular docking of α-Amylase, α-Glucosidase, and AMPK confirmed the putatively acting molecules from the extracts of purple onion, cinnamon, and tea. Conclusions: Overall, this investigation evidenced a beneficial mediation for the progression of lowering blood glucose with a combinatory extract of cinnamon, dietary onion, and tea, implicating their prospective as nutraceuticals that might ameliorate hyperglycemia in diabetes.

scholarly journals Preliminary phytochemical screening and evaluation of hypoglycemic properties of the root extract of Uveria chamae

2015 ◽  
Vol 10 (2) ◽  
pp. 326 ◽  
Author(s):  
Emordi Jonathan Emeka ◽  
Agbaje Esther Oluwatoyin ◽  
Oreagba Ibrahim Adekunle ◽  
Iribhogbe Osede Ignis
Keyword(s):  
Single Dose ◽  
Blood Glucose ◽  
Glucose Tolerance ◽  
Glucose Tolerance Test ◽  
Tolerance Test ◽  
Oral Glucose ◽  
Oral Glucose Tolerance ◽  
Phytochemical Screening ◽  
Glucose Levels ◽  
Blood Glucose Levels

<p>The purpose of this study is to evaluate the hypoglycaemic properties and preliminary phytochemical screening of <em>Uveria chamae</em>. The hypoglycaemic properties of <em>Uveria chamae</em> was assessed on normoglycaemic rat that received single dose of the extract at 250 and 500 mg/kg body weight and blood glucose levels estimated at 2, 4, and 6 hours (single dose study). The hypoglycaemic property of the extract was also evaluated in normoglycemic rats by oral glucose tolerance test. Phytochemical screening of the extract for the presence of secondary metabolites was performed with standard methods. The extract showed a significant (p&lt;0.05) reduction in blood glucose levels at 2h and 6h compared to control.  The oral glucose tolerance test  result also showed a significant decrease (p&lt;0.05) in blood glucose levels . The study showed that the extract, <em>Uveria chamae</em> has hypoglycaemic properties which may be accounted for by the presence of the phytochemicals.</p><p> </p>

scholarly journals Hypoglycemic effects and mechanisms of electroacupuncture on insulin resistance

2014 ◽  
Vol 307 (3) ◽  
pp. R332-R339 ◽  
Author(s):  
Jieyun Yin ◽  
Jian Kuang ◽  
Manisha Chandalia ◽  
Demidmaa Tuvdendorj ◽  
Batbayar Tumurbaatar ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Fatty Acid ◽  
Blood Glucose ◽  
Insulin Sensitivity ◽  
Free Fatty Acid ◽  
Glucose Tolerance ◽  
High Fat Diet ◽  
Postprandial Glucose ◽  
Tolerance Test ◽  
High Fat

The aim of this study was to investigate effects and mechanisms of electroacupuncture (EA) on blood glucose and insulin sensitivity in mice fed a high-fat diet. Both wild-type (WT) and adipose ectonucleotide pyrophosphate phosphodiesterase (ENPP1) transgenic (TG) mice were fed a high-fat diet for 12 wk; for each mouse, an intraperitoneal glucose tolerance test (IPGTT) and insulin tolerance test (ITT) were performed with or without EA at abdomen or auricular areas. A high-fat diet-induced insulin resistance in both WT and TG mice. In the WT mice, EA at 3 Hz and 15 Hz, but not at 1 Hz or 100 Hz, via CV4+CV12 significantly reduced postprandial glucose levels; EA at 3 Hz was most potent. The glucose level was reduced by 61.7% at 60 min and 74.5% at 120 min with EA at 3 Hz (all P < 0.001 vs. control). Similar hypoglycemic effect was noted in the TG mice. On the contrary, EA at auricular points increased postprandial glucose level ( P < 0.03). 4). EA at 3 Hz via CV4+CV12 significantly enhanced the decrease of blood glucose after insulin injection, suggesting improvement of insulin sensitivity. Plasma free fatty acid was significantly suppressed by 42.5% at 15 min and 50.8% at 30 min with EA ( P < 0.01) in both WT and TG mice. EA improves glucose tolerance in both WT and TG mice fed a high-fat diet, and the effect is associated with stimulation parameters and acupoints and is probably attributed to the reduction of free fatty acid.

Analysis of candidate genes in Polish families with obesity

2004 ◽  
Vol 42 (5) ◽  
Author(s):  
Malgorzata Malczewska-Malec ◽  
Iwona Wybranska ◽  
Iwona Leszczynska-Golabek ◽  
Lukasz Partyka ◽  
Jadwiga Hartwich ◽  
...  
Keyword(s):  
Risk Factors ◽  
Insulin Resistance ◽  
Insulin Sensitivity ◽  
Body Mass ◽  
Tolerance Test ◽  
Whole Body ◽  
Oral Glucose ◽  
Sensitivity Index ◽  
Model Assessment ◽  
The Metabolic Syndrome

AbstractThis study analyzes the relationship between risk factors related to overweight/obesity, insulin resistance, lipid tolerance, hypertension, endothelial function and genetic polymorphisms associated with: i) appetite regulation (leptin, melanocortin-3-receptor (MCR-3), dopamine receptor 2 (D2R)); ii) adipocyte differentiation and insulin sensitivity (peroxisome proliferator-activated receptor-γThe 122 members of 40 obese Caucasian families from southern Poland participated in the study. The genotypes were analyzed by restriction fragment length polymorphism-polymerase chain reaction (RFLP-PCR) or by direct sequencing. Phenotypes related to obesity (body mass index (BMI), fat/lean body mass composition, waist-to-hip ratio (WHR)), fasting lipids, glucose, leptin and insulin, as well as insulin during oral glucose tolerance test (OGTT) (4 points within 2 hours) and during oral lipid tolerance test (OLTT) (5 points within 8 hours) were assessed. The insulin sensitivity indexes: homeostasis model assessment of insulin resistance, whole body insulin sensitivity index, hepatic insulin sensitivity and early secretory response to an oral glucose load (HOMA-IR, ISI-COMP, ISI-HOMA and DELTA) were calculated.The single gene mutations such as CWe conclude that the polymorphisms we investigated were weakly correlated with obesity but significantly modified the risk factors of the metabolic syndrome.

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