Article
Endocrinology & Metabolism
Benedikt A. Aulinger, David A. D'Alessio
Summary: This study compares two different methods to measure the incretin effect and suggests various calculation methods to interpret the results. The study finds that both techniques have similar quantitative results and can be used to measure the incretin effect.
AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM
(2023)
Article
Endocrinology & Metabolism
Jonatan Bagger, Magnus F. G. Grondahl, Asger Lund, Jens J. Holst, Tina Vilsboll, Filip K. Knop
Summary: The study showed that GLP-1 potentiated the glucagon-suppressive effect of glucose in a dose-dependent manner in healthy individuals and patients with type 2 diabetes. However, patients with type 1 diabetes were insensitive to the glucagonostatic effects of both glucose and GLP-1.
Article
Multidisciplinary Sciences
Thomas P. J. Solomon, Steven Carter, Jacob M. Haus, Kristian Karstoft, Stephanie von Holstein-Rathlou, Mette S. Nielsen, Matthew P. Gillum
Summary: The study suggests that changes in plasma glucose directly drive increases in FGF21 secretion, independent of insulin or GLP-1 secretion. Further postprandial investigations are needed to confirm these observations from basic science infusion models.
Article
Endocrinology & Metabolism
Michael M. Richter, Katrine D. Galsgaard, Emilie Elmelund, Filip K. Knop, Malte P. Suppli, Jens J. Holst, Marie Winther-Sorensen, Sasha A. S. Kjeldsen, Nicolai J. Wewer Albrechtsen
Summary: Glucagon and insulin are the main regulators of blood glucose, but less is known about the actions of glucagon. This study focuses on the liver-alpha-cell axis and its role in glucose homeostasis, amino acid catabolism, and lipid metabolism. The concept of glucagon resistance and its implications in metabolic diseases are also discussed.
Article
Endocrinology & Metabolism
Xiang Zhang, Zhiqiang Cheng, Shuohui Dong, Christopher Rayner, Tongzhi Wu, Mingwei Zhong, Guangyong Zhang, Kexin Wang, Sanyuan Hu
Summary: The study found that even over a short length of 30 cm, stimulation of the terminal ileum by glucose induced substantial GLP-1 release, primarily coupled to active glucose absorption.
METABOLISM-CLINICAL AND EXPERIMENTAL
(2022)
Article
Endocrinology & Metabolism
Jean-Claude Henquin
Summary: Optimal metabolic homeostasis requires precise control of insulin secretion, which is influenced by various factors. Inconsistent findings between in vitro and clinical studies may result from extreme experimental conditions that do not reflect physiological relevance.
METABOLISM-CLINICAL AND EXPERIMENTAL
(2021)
Article
Endocrinology & Metabolism
Cong Xie, Weikun Huang, Yixuan Sun, Chunjie Xiang, Laurence Trahair, Karen L. Jones, Michael Horowitz, Christopher K. Rayner, Tongzhi Wu
Summary: This study compared the blood glucose, insulin, and incretin responses to intraduodenal glucose infusions in healthy young males and females. The findings showed that women exhibited a significantly higher GLP-1 response compared to men, while their GIP response was similar. This study provides a potential mechanism for the lower risk of diabetes in premenopausal women compared to men.
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
(2023)
Article
Medicine, Research & Experimental
Shana O. Warner, Yufei Dai, Nicole Sheanon, Michael V. Yao, Rebecca L. Cason, Shahriar Arbabi, Shailendra B. Patel, Diana Lindquist, Jason J. Winnick
Summary: Fasting increases the risk of hypoglycemia in individuals with type 1 diabetes, and it also negatively affects insulin-induced hypoglycemia responses in healthy individuals.
Article
Endocrinology & Metabolism
Bruno Blanchi, Marion Taurand, Claire Colace, Sofia Thomaidou, Charlotte Audeoud, Federica Fantuzzi, Toshiaki Sawatani, Sevda Gheibi, Joan Sabadell-Basallote, Fransje W. J. Boot, Thibault Chantier, Aline Piet, Charlotte Cavanihac, Marion Pilette, Adelie Balguerie, Hamza Olleik, Francoise Carlotti, Miriam Ejarque, Malin Fex, Hindrik Mulder, Miriam Cnop, Decio L. Eizirik, Ouardane Jouannot, Anne-Lise Gaffuri, Paul Czernichow, Arnaud Zaldumbide, Raphael Scharfmann, Philippe Ravassard
Summary: This study presents a novel human pancreatic beta cell model called EndoC-f3H5 cells, which can be readily accessed, stored, and used for studying beta cell physiology and developing diabetes treatments. These cells exhibit highly efficient glucose-dependent insulin secretion and dynamic response to glucose, which can be further potentiated by GIP and GLP-1 analogs.
MOLECULAR METABOLISM
(2023)
Article
Endocrinology & Metabolism
Xi Chen, Aurora Merovci, Ralph A. DeFronzo, Devjit Tripathy
Summary: A chronic physiologic increase in plasma glucose concentration for 48-72 hours impairs insulin-mediated suppression of glucagon secretion and causes whole body insulin resistance, indicating the importance of glucotoxicity in the development of hyperglucagonemia in type 2 diabetes mellitus.
METABOLISM-CLINICAL AND EXPERIMENTAL
(2023)
Article
Endocrinology & Metabolism
Nadejda Bozadjieva Kramer, Camila Lubaczeuski, Manuel Blandino-Rosano, Grant Barker, George K. Gittes, Alejandro Caicedo, Ernesto Bernal-Mizrachi
Summary: The elevation of glucagon levels and increase in alpha-cell mass in diabetes are associated with states of hyperglycemia. Activating nutrient signaling by conditional deletion of the mTORC1 inhibitor, TSC2, in alpha-cells can induce chronic hyperglucagonemia, leading to improvements in glucose homeostasis through glucagon resistance in the liver. The resistance is characterized by reduced expression of glucagon receptor (GCGR), PEPCK, and genes involved in amino acid metabolism and urea production.
Article
Endocrinology & Metabolism
Kent Pedersen, Helle Andersen, Christian Fledelius, Jens Juul Holst, Sara Toftegaard Hjuler, Rune Ehrenreich Kuhre
Summary: This study investigated the impact of blood sampling methods on glucose regulation and hormone secretion in conscious rats. It was found that restraint and sublingual vein puncture induced stress responses, resulting in reduced glucose absorption, tolerance, and secretion of insulin and glucose-dependent insulinotropic peptide (GIP). These findings suggest the importance of careful selection of blood sampling methods in rat experiments to avoid stress-related biases in the results.
MOLECULAR METABOLISM
(2023)
Article
Cell Biology
Hitoshi Watanabe, Wen Du, Jinsook Son, Lina Sui, Shun-ichiro Asahara, Irwin J. Kurland, Taiyi Kuo, Takumi Kitamoto, Yasutaka Miyachi, Rafael de Cabo, Domenico Accili
Summary: Sulfonylureas are effective and affordable antidiabetic drugs, but chronic use leads to secondary failure. Cytochrome b5 reductase 3 (Cyb5r3) down-regulation is identified as a mechanism of secondary SU failure and can be successfully reversed. Cyb5r3 activators can rescue secondary SU failure and potentially rehabilitate SU use in diabetes.
SCIENCE TRANSLATIONAL MEDICINE
(2023)
Article
Endocrinology & Metabolism
Marcello C. Laurenti, Adrian Vella, Jon D. Adams, Daniel J. Schembri Wismayer, Aoife M. Egan, Chiara Dalla Man
Summary: This study successfully measured glucagon kinetics in 51 non-diabetic subjects and developed a population-based model to predict the volume of distribution and clearance rate of glucagon using anthropometric characteristics. Stepwise linear regression was used to correlate these parameters with BMI, sex, lean body mass, or BSA. This marks a necessary first step towards quantifying glucagon secretion and action in large populations.
AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM
(2021)
Article
Pharmacology & Pharmacy
Hyo-Seon Kim, Dahae Lee, Young-Hye Seo, Seung-Mok Ryu, A-Yeong Lee, Byeong-Cheol Moon, Wook-Jin Kim, Ki-Sung Kang, Jun Lee
Summary: The study aimed to identify bioactive compounds from Angelica reflexa that enhance glucose-stimulated insulin secretion (GSIS) in pancreatic beta-cells. Three new compounds (koseonolin A (1), koseonolin B (2), and isohydroxylomatin (3)) and 28 compounds (4-31) were isolated from the roots of A. reflexa. The effects of the root extract and isolated compounds on GSIS were evaluated, and marmesinin (19) was found to be the most effective, surpassing gliclazide in terms of the improvement of GSIS. The findings suggest that marmesinin (19) has the potential to be used in developing novel therapies for type 2 diabetes.
Letter
Endocrinology & Metabolism
Tongzhi Wu, Christopher K. Rayner, Karen L. Jones, Michael Horowitz, Christine Feinle-Bisset, Scott D. Standfield, Cong Xie, Carolyn F. Deacon, Jens J. Holst, Nicolai J. Wewer Albrechtsen
DIABETES OBESITY & METABOLISM
(2022)
Article
Pharmacology & Pharmacy
Julie E. Stevens, Ryan J. Jalleh, Laurence G. Trahair, Chinmay S. Marathe, Michael Horowitz, Karen L. Jones
Summary: This study evaluated the comparative effects of low-carbohydrate, full-strength, and low-alcohol beer on gastric emptying, ethanol absorption, blood glucose, and plasma insulin in healthy individuals. The results showed no difference in gastric emptying between the three types of beer, but lower ethanol levels and higher blood glucose response were observed with low-alcohol beer.
BRITISH JOURNAL OF CLINICAL PHARMACOLOGY
(2022)
Article
Endocrinology & Metabolism
Xuyi Wang, Chang Chen, Cong Xie, Weikun Huang, Richard L. Young, Karen L. Jones, Michael Horowitz, Christopher K. Rayner, Zilin Sun, Tongzhi Wu
Summary: This study found that the serum bile acid response to a 75-g oral glucose load is attenuated in patients with 'early' type 2 diabetes, while in individuals without diabetes it correlates with 2-hour plasma glucose levels.
DIABETES OBESITY & METABOLISM
(2022)
Article
Endocrinology & Metabolism
Miaomiao Sang, Cong Xie, Shanhu Qiu, Xuyi Wang, Michael Horowitz, Karen L. Jones, Christopher K. Rayner, Zilin Sun, Tongzhi Wu
Summary: This study aimed to investigate the association between cholecystectomy and dysglycaemia in Chinese community-dwelling adults. The findings showed that cholecystectomy was associated with an increased risk of diabetes and prediabetes, as well as a greater risk of deterioration in glycaemic control.
DIABETES OBESITY & METABOLISM
(2022)
Article
Endocrinology & Metabolism
Laurence G. Trahair, Michael A. Nauck, Tongzhi Wu, Julie E. Stevens, Madeline D. Buttfield, Seva Hatzinikolas, Hung Pham, Juris J. Meier, Christopher K. Rayner, Michael Horowitz, Karen L. Jones
Summary: In this study, different methods were compared to assess gastric emptying in patients with type 2 diabetes. The results showed that the breath test analyzed with Wagner-Nelson analysis closely reflected the measurements obtained with scintigraphy, while the conventional breath test analysis had significant differences compared to both methods.
EXPERIMENTAL AND CLINICAL ENDOCRINOLOGY & DIABETES
(2022)
Article
Endocrinology & Metabolism
Ryan J. Jalleh, Tongzhi Wu, Karen L. Jones, Christopher K. Rayner, Michael Horowitz, Chinmay S. Marathe
Summary: This study evaluated the relationship between plasma glucose, GLP-1, and insulin secretion and gastric emptying (GE) in patients with type 2 diabetes (T2D). The results showed a positive correlation between plasma glucose levels at 30, 60, and 120 minutes and GE, but not at 180 minutes. Multiple regression analysis revealed a weak correlation between plasma glucose at 120 minutes and GE. However, there was no relationship between plasma GLP-1 and GE, and GE did not significantly affect insulin secretion. Further evaluation of this relationship is necessary.
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
(2022)
Article
Nutrition & Dietetics
Avneet Oberoi, Caroline Giezenaar, Kylie Lange, Karen L. Jones, Michael Horowitz, Ian Chapman, Stijn Soenen
Summary: This study found that even with relatively low intake of whey protein, there is a risk of blood pressure decrease in older men.
Article
Nutrition & Dietetics
Miaomiao Sang, Tongzhi Wu, Xiaoying Zhou, Michael Horowitz, Karen L. Jones, Shanhu Qiu, Haijian Guo, Bei Wang, Donglei Wang, Christopher K. Rayner, Zilin Sun
Summary: Gastrointestinal symptoms are common in Chinese community-dwelling individuals, with females and older individuals with diabetes being at an increased risk of these symptoms.
Article
Endocrinology & Metabolism
Avneet Oberoi, Caroline Giezenaar, Rachael S. Rigda, Michael Horowitz, Karen L. Jones, Ian Chapman, Stijn Soenen
Summary: This study aimed to investigate the effect of co-ingestion of dietary protein with, or before, carbohydrate on postprandial hyperglycemia in older men with type 2 diabetes (T2D). The results showed that simultaneous intake of glucose and whey protein significantly reduced blood glucose concentrations and had a synergistic effect on insulin concentrations in both men with and without T2D. Additionally, gastric emptying was faster in men with T2D. Therefore, whey protein supplementation may be an effective strategy for the prevention and management of T2D in older individuals.
DIABETES OBESITY & METABOLISM
(2023)
Editorial Material
Gastroenterology & Hepatology
Karen L. Jones, Christopher K. Rayner, Michael Horowitz
ALIMENTARY PHARMACOLOGY & THERAPEUTICS
(2023)
Article
Endocrinology & Metabolism
Ryan J. Jalleh, Laurence G. Trahair, Tongzhi Wu, Scott Standfield, Christine Feinle-Bisset, Christopher K. Rayner, Michael Horowitz, Karen L. Jones
Summary: This study aimed to evaluate the effect of gastric distension on the secretion of GIP and GLP-1 in healthy individuals. The results showed that gastric distension did not significantly stimulate the secretion of GLP-1 and GIP, regardless of the presence or absence of small intestinal nutrients.
DIABETES OBESITY & METABOLISM
(2023)
Article
Endocrinology & Metabolism
Cong Xie, Weikun Huang, Yixuan Sun, Chunjie Xiang, Laurence Trahair, Karen L. Jones, Michael Horowitz, Christopher K. Rayner, Tongzhi Wu
Summary: This study compared the blood glucose, insulin, and incretin responses to intraduodenal glucose infusions in healthy young males and females. The findings showed that women exhibited a significantly higher GLP-1 response compared to men, while their GIP response was similar. This study provides a potential mechanism for the lower risk of diabetes in premenopausal women compared to men.
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
(2023)
Editorial Material
Medicine, General & Internal
Ryan J. Jalleh, Karen L. Jones, Michael Nauck, Michael Horowitz
ANNALS OF INTERNAL MEDICINE
(2023)
Review
Endocrinology & Metabolism
Ryan Joseph Jalleh, Mahesh Michael Umapathysivam, Mark Philip Plummer, Adam Deane, Karen Louise Jones, Michael Horowitz
Summary: Following bariatric surgery, individuals with post-bariatric surgery hypoglycemia show higher responses in GLP-1, GIP, insulin, and C-peptide, and lower levels of HbA(1c).
REVIEWS IN ENDOCRINE & METABOLIC DISORDERS
(2023)
Article
Nutrition & Dietetics
Ryan J. Jalleh, Chinmay S. Marathe, Laurence G. Trahair, Karen L. Jones, Michael Horowitz
Summary: The pattern of the plasma glucose response curve during an oral glucose tolerance test is associated with insulin sensitivity/secretion and the risk of progression to diabetes. However, there is no relationship between the glucose response curve and gastric emptying or incretin hormone secretion.