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Camacho RC, Polidori D, Chen T, Chen B, Hsu HH, Gao B, Marella M, Lubomirski M, Beavers T, Cabrera J, Wong P, Nawrocki AR. Validation of a diet-induced Macaca fascicularis model of non-alcoholic steatohepatitis with dietary and pioglitazone interventions. Diabetes Obes Metab 2023; 25:1068-1079. [PMID: 36546607 DOI: 10.1111/dom.14955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 11/28/2022] [Accepted: 12/08/2022] [Indexed: 12/24/2022]
Abstract
AIM To develop an obese, insulin-resistant cynomolgus monkey model of non-alcoholic steatohepatitis (NASH) with fibrosis with a high fat/high cholesterol (HFHC) diet (with or without high fructose) and test its responsiveness to caloric restriction or pioglitazone. METHODS First, two groups of monkeys (n = 24/group) with histologically proven NASH and fibrosis were fed the HFHC diet for 17 weeks. The treatment group was subjected to a 40% caloric restriction (CR) and had their diet switched from the HFHC diet to a chow diet (DSCR). Paired liver biopsies were taken before and 17 weeks after DSCR. Subsets of monkeys (nine/group) had whole liver fat content assessed by MRI. Next, two groups of monkeys with histologically proven NASH and fibrosis were treated with vehicle (n = 9) or pioglitazone (n = 20) over 24 weeks. RESULTS The HFHC and DSCR groups lost 0.9% and 11.4% of body weight, respectively. After 17 weeks, non-alcoholic fatty liver disease activity score (NAS) improvement was observed in 66.7% of the DSCR group versus 12.5% of the HFHC group (P < .001). Hepatic fat was reduced to 5.2% in the DSCR group versus 23.0% in the HFHC group (P = .0001). After 24 weeks, NAS improvement was seen in 30% of the pioglitazone group versus 0% of the vehicle group (P = .08). CONCLUSIONS Both weight loss induced by DSCR and treatment with pioglitazone improve the histological features of NASH in a diet-induced cynomolgus monkey model. This model provides a translational preclinical model for testing novel NASH therapies.
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Affiliation(s)
- Raul C Camacho
- Cardiovascular Metabolism, Spring House, Pennsylvania, USA
| | - David Polidori
- Cardiovascular Metabolism, Spring House, Pennsylvania, USA
| | - Tao Chen
- Preclincial Sciences and Translational Safety, Shanghai, China
| | - Bin Chen
- Preclincial Sciences and Translational Safety, Shanghai, China
| | - Helen Han Hsu
- Preclincial Sciences and Translational Safety, Shanghai, China
| | - Bin Gao
- Translational Medicine and Early Development Statistics, Spring House, Pennsylvania, USA
| | | | - Mariusz Lubomirski
- Translational Medicine and Early Development Statistics, Spring House, Pennsylvania, USA
| | - Traymon Beavers
- Translational Medicine and Early Development Statistics, Spring House, Pennsylvania, USA
| | - Javier Cabrera
- Translational Medicine and Early Development Statistics, Spring House, Pennsylvania, USA
| | - Peggy Wong
- Quantitative Sciences, Janssen R&D, Raritan, New Jersey, USA
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Kamm DR, Pyles KD, Sharpe MC, Healy LN, Colca JR, McCommis KS. Novel insulin sensitizer MSDC-0602K improves insulinemia and fatty liver disease in mice, alone and in combination with liraglutide. J Biol Chem 2021; 296:100807. [PMID: 34022222 PMCID: PMC8192871 DOI: 10.1016/j.jbc.2021.100807] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 05/14/2021] [Accepted: 05/18/2021] [Indexed: 01/04/2023] Open
Abstract
Insulin sensitizers and incretin mimetics are antidiabetic agents with vastly different mechanisms of action. Thiazolidinedione (TZD) insulin sensitizers are associated with weight gain, whereas glucagon-like peptide-1 receptor agonists can induce weight loss. We hypothesized that combination of a TZD insulin sensitizer and the glucagon-like peptide-1 receptor agonist liraglutide would more significantly improve mouse models of diabetes and nonalcoholic steatohepatitis (NASH). Diabetic db/db and MS-NASH mice were treated with the TZD MSDC-0602K by oral gavage, liraglutide (Lira) by s.c. injection, or combination 0602K+Lira. Lira slightly reduced body weight and modestly improved glycemia in db/db mice. Comparatively, 0602K-treated and 0602K+Lira-treated mice exhibited slight weight gain but completely corrected glycemia and improved glucose tolerance. 0602K reduced plasma insulin, whereas Lira further increased the hyperinsulinemia of db/db mice. Surprisingly, 0602K+Lira treatment reduced plasma insulin and C-peptide to the same extent as mice treated with 0602K alone. 0602K did not reduce glucose-stimulated insulin secretion in vivo, or in isolated islets, indicating the reduced insulinemia was likely compensatory to improved insulin sensitivity. In MS-NASH mice, both 0602K or Lira alone improved plasma alanine aminotransferase and aspartate aminotransferase, as well as liver histology, but more significant improvements were observed with 0602K+Lira treatment. 0602K or 0602K+Lira also increased pancreatic insulin content in both db/db and MS-NASH mice. In conclusion, MSDC-0602K corrected glycemia and reduced insulinemia when given alone, or in combination with Lira. However, 0602K+Lira combination more significantly improved glucose tolerance and liver histology, suggesting that this combination treatment may be an effective therapeutic strategy for diabetes and NASH.
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Affiliation(s)
- Dakota R Kamm
- Biochemistry & Molecular Biology, Saint Louis University School of Medicine, St Louis, Missouri, USA
| | - Kelly D Pyles
- Biochemistry & Molecular Biology, Saint Louis University School of Medicine, St Louis, Missouri, USA
| | - Martin C Sharpe
- Biochemistry & Molecular Biology, Saint Louis University School of Medicine, St Louis, Missouri, USA
| | - Laura N Healy
- LNH Tox Path Consulting LLC, Newbury Park, California, USA
| | - Jerry R Colca
- Cirius Therapeutics, Kalamazoo, Michigan, USA; Cirius Therapeutics, San Diego, California, USA
| | - Kyle S McCommis
- Biochemistry & Molecular Biology, Saint Louis University School of Medicine, St Louis, Missouri, USA.
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Guzmán-Ruiz MA, Jiménez A, Cárdenas-Rivera A, Guerrero-Vargas NN, Organista-Juárez D, Guevara-Guzmán R. Regulation of Metabolic Health by an "Olfactory-Hypothalamic Axis" and Its Possible Implications for the Development of Therapeutic Approaches for Obesity and T2D. Cell Mol Neurobiol 2021; 42:1727-1743. [PMID: 33813677 DOI: 10.1007/s10571-021-01080-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 03/12/2021] [Indexed: 12/12/2022]
Abstract
The olfactory system is responsible for the reception, integration and interpretation of odors. However, in the last years, it has been discovered that the olfactory perception of food can rapidly modulate the activity of hypothalamic neurons involved in the regulation of energy balance. Conversely, the hormonal signals derived from changes in the metabolic status of the body can also change the sensitivity of the olfactory system, suggesting that the bidirectional relationship established between the olfactory and the hypothalamic systems is key for the maintenance of metabolic homeostasis. In the first part of this review, we describe the possible mechanisms and anatomical pathways involved in the modulation of energy balance regulated by the olfactory system. Hence, we propose a model to explain its implication in the maintenance of the metabolic homeostasis of the organism. In the second part, we discuss how the olfactory system could be involved in the development of metabolic diseases such as obesity and type two diabetes and, finally, we propose the use of intranasal therapies aimed to regulate and improve the activity of the olfactory system that in turn will be able to control the neuronal activity of hypothalamic centers to prevent or ameliorate metabolic diseases.
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Affiliation(s)
- Mara Alaide Guzmán-Ruiz
- Laboratorio Sensorial, Departamento de Fisiología, Facultad de Medicina, Edificio A, 4º piso, Universidad Nacional Autónoma de México (UNAM), 04510, Ciudad de México, México.
| | - Adriana Jiménez
- Laboratorio Sensorial, Departamento de Fisiología, Facultad de Medicina, Edificio A, 4º piso, Universidad Nacional Autónoma de México (UNAM), 04510, Ciudad de México, México
| | - Alfredo Cárdenas-Rivera
- Centro de Investigación en Bioingeniería, Universidad de Ingeniería y Tecnología, Lima, Perú
| | - Natalí N Guerrero-Vargas
- Departamento de Anatomía, Facultad de Medicina, Universidad Nacional Autónoma de México, México City, México
| | - Diana Organista-Juárez
- Laboratorio Sensorial, Departamento de Fisiología, Facultad de Medicina, Edificio A, 4º piso, Universidad Nacional Autónoma de México (UNAM), 04510, Ciudad de México, México
| | - Rosalinda Guevara-Guzmán
- Laboratorio Sensorial, Departamento de Fisiología, Facultad de Medicina, Edificio A, 4º piso, Universidad Nacional Autónoma de México (UNAM), 04510, Ciudad de México, México.
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4
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Bilginoglu A. Cardiovascular protective effect of pioglitazone on oxidative stress in rats with metabolic syndrome. J Chin Med Assoc 2019; 82:452-456. [PMID: 30932940 DOI: 10.1097/jcma.0000000000000103] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Although cardiovascular oxidative stress is examined in type 2 diabetes, there is relatively limited number of reports about the effect of pioglitazone, an insulin sensitizer, on cardiovascular oxidative stress in sucrose diet-induced metabolic syndrome (MetS). As a regulator of cardiovascular homeostasis, thioredoxin (TRX) has an important role in defense against oxidative stress in cardiovascular diseases. The purpose of this study is to investigate the role of pioglitazone on oxidative stress markers and TRX1 level in tissues of both heart and aorta from MetS rats. METHODS Male Wistar rats (200 to 250 g in weight) were divided into three groups: control group, MetS group receiving drinking water including 935 mM sucrose, and pioglitazone-treated MetS (MetS-P) group. Aspartate aminotransferase (AST), lactate dehydrogenase (LDH), total oxidant status (TOS), and total antioxidant status (TAS) levels were measured in serum and tissues using commercial kits. Malondialdehyde (MDA) and superoxide dismutase (SOD) were measured in serum and tissues for experimental groups. TRX1 protein level was measured by western blot. RESULTS The sucrose-fed rats exhibited several characteristics of MetS. In MetS group, AST, LDH, TOS, and MDA levels of heart and aorta tissues increased, whereas TAS and SOD levels of these tissues decreased. TRX1 protein level of heart and aorta tissues decreased in MetS group. Also, in the serum of experimental groups, AST, LDH, and TOS levels increased. CONCLUSION Pioglitazone treatment significantly increased TRX1 protein level in heart and aorta tissues in MetS group. Pioglitazone affected the TRX1 protein level via regulation of reactive oxygen intermediates. Pioglitazone reduced the elevated oxidative stress in heart and aorta of MetS rats.
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Eraky SM, Abdel-Rahman N, Eissa LA. Modulating effects of omega-3 fatty acids and pioglitazone combination on insulin resistance through toll-like receptor 4 in type 2 diabetes mellitus. Prostaglandins Leukot Essent Fatty Acids 2018; 136:123-129. [PMID: 28716464 DOI: 10.1016/j.plefa.2017.06.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 05/19/2017] [Accepted: 06/15/2017] [Indexed: 12/26/2022]
Abstract
Toll-like receptor 4 (TLR-4) plays important roles in innate immunity. Changes in the reduction-oxidation balance of tissues can lead to a pro-inflammatory state and insulin resistance. An action thought to be mediated by TLRs. Omega-3 fatty acids and Peroxisome Proliferator Activated Receptor gamma (PPAR-γ) agonists as pioglitazone are used for decreasing inflammation. The aim of this study is to investigate the anti-diabetic effects of combining omega -3 fatty acid with pioglitazone on type 2 diabetes, and the modifying effects on TLR-4. Type 2 diabetes was induced in male Sprague-Dawley rats by combination of high fat diet and low dose streptozotocin (35mg/kg). Diabetic rats were treated with omega-3 fatty acids (10% W/W diet), pioglitazone (20mg/kg), and their combination for 4 weeks. Omega-3 fatty acids and the combination treatment significantly decreased TLR-4 activation. Omega-3 fatty acids, pioglitazone, and their combination significantly decreased TLR-4 mRNA expression, hepatic malondialdehyde, total cholesterol and triglycerides levels, compared to diabetic group. Pioglitazone and the combination significantly decreased blood glucose levels and improved insulin resistance. In conclusion, combining omega-3 fatty acids with pioglitazone showed potential effects in lowering blood glucose levels and improving lipid profile and insulin resistance. Such effects are mediated through modulation of TLR-4.
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Affiliation(s)
- Salma M Eraky
- Biochemistry department, Faculty of Pharmacy, Mansoura University, 35516, Egypt.
| | - Noha Abdel-Rahman
- Biochemistry department, Faculty of Pharmacy, Mansoura University, 35516, Egypt
| | - Laila A Eissa
- Biochemistry department, Faculty of Pharmacy, Mansoura University, 35516, Egypt
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Balasubramanian P, Mattison JA, Anderson RM. Nutrition, metabolism, and targeting aging in nonhuman primates. Ageing Res Rev 2017; 39:29-35. [PMID: 28219777 PMCID: PMC5563491 DOI: 10.1016/j.arr.2017.02.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 12/29/2016] [Accepted: 02/15/2017] [Indexed: 11/23/2022]
Abstract
This short review focuses on the importance of nonhuman primate nutrition and aging studies and makes the case that a targeted expansion of the use of this highly translatable model would be advantageous to the biology of aging field. First, we describe the high degree of similarity of the model in terms of aging phenotypes including incidence and prevalence of common human age-related diseases. Second, we discuss the importance of the nonhuman primate nutrition and aging studies and the extent to which the outcomes of two ongoing long-term studies of caloric restriction are congruent with short-term equivalent studies in humans. Third, we showcase a number of pharmacological agents previously employed in nonhuman primate studies that display some potential as caloric restriction mimetics. Finally, we present nonhuman primates as an important model for translation of mechanisms of delayed aging identified in studies of shorter-lived animals. Proof of efficacy and safety of candidate longevity agents in nonhuman primates would be a cost-effective means to bring these exciting new avenues a step closer to clinical application.
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Affiliation(s)
- Priya Balasubramanian
- Department of Medicine, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
| | - Julie A Mattison
- Translational Gerontology Branch, National Institute on Aging, Baltimore, MD, USA
| | - Rozalyn M Anderson
- Department of Medicine, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA; Geriatic Research, Education, and Clinical Center, William S. Middleton Memorial Veterans Hospital, Madison, WI, USA.
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7
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Li X, Zhao Y, Jin Y, Zhang T, Chang X, Liao S, Xu H, Liu X, Yang J, Zhang J, Zhang Y. Associations between serum adipocytokines and glycemic tolerance biomarkers in a rural Chinese population. PLoS One 2017; 12:e0182273. [PMID: 28786989 PMCID: PMC5546634 DOI: 10.1371/journal.pone.0182273] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 07/14/2017] [Indexed: 01/10/2023] Open
Abstract
Although experimental studies have shown that adiponectin and leptin modulate glucose tolerance and insulin resistance, it remains unclear whether these adipocytokines exert similar effects in general human populations. We evaluated the associations of serum adiponectin and leptin with β-cell function and insulin resistance in a population with low obesity prevalence. A cross-sectional study of 783 rural residents, aged 25-74 years, recruited in Ningxia, China was conducted during 2008-2012. β-cell function and insulin resistance were estimated using the Homeostasis Model Assessment. Serum adiponectin and leptin were measured with ELISA. Serum adiponectin concentrations (mean ± SD) were highest in subjects with normal glucose tolerance (36.65 ± 61.13 μg/ml), intermediate in those with impaired fasting glucose (25.92 ± 34.48 μg/ml), and lowest in those with diabetes (15.08 ± 12.14 μg/ml) (p = 0.001). A similar pattern of differences was found for β-cell function, whereas opposite results were observed for insulin resistance and blood glucose. After adjustment for confounders including metabolic syndrome components, serum adiponectin (μg/ml) was inversely associated with β-cell function (%β) [β (95% CI): -7.57 (-12.33, -2.81)] and insulin resistance (100/%S) [β (95% CI): -0.21 (-0.33, -0.09)]. A significant inverse association also existed between serum leptin and β-cell function, but serum leptin was not significantly associated with insulin resistance. The present study suggests that adiponectin and leptin play a role in the development of insulin resistance and diabetes independent of metabolic syndrome.
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Affiliation(s)
- Xiaoxia Li
- Department of Epidemiology, School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia Hui Autonomous Region, People’s Republic of China
| | - Yi Zhao
- Department of Epidemiology, School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia Hui Autonomous Region, People’s Republic of China
| | - Yanan Jin
- Ningxia Center for Disease Control and Prevention, Yinchuan, Ningxia Hui Autonomous Region, People’s Republic of China
| | - Tianjing Zhang
- Department of Epidemiology, School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia Hui Autonomous Region, People’s Republic of China
| | - Xiaoyu Chang
- Department of Epidemiology, School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia Hui Autonomous Region, People’s Republic of China
| | - Sha Liao
- Sichuan Provincial Center for Disease Control and Prevention, Chengdu, Sichuan Province, People’s Republic of China
| | - Hongxia Xu
- Department of Epidemiology, School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia Hui Autonomous Region, People’s Republic of China
| | - Xiuying Liu
- Department of Epidemiology, School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia Hui Autonomous Region, People’s Republic of China
| | - Jianjun Yang
- Department of Epidemiology, School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia Hui Autonomous Region, People’s Republic of China
| | - Jianjun Zhang
- Department of Epidemiology, Richard M. Fairbanks School of Public Health, Indiana University, Indianapolis, Indiana, United States of America
- * E-mail: (YHZ); (JJZ)
| | - Yuhong Zhang
- Department of Epidemiology, School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia Hui Autonomous Region, People’s Republic of China
- * E-mail: (YHZ); (JJZ)
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8
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Shang J, Previs SF, Conarello S, Chng K, Zhu Y, Souza SC, Staup M, Chen Y, Xie D, Zycband E, Schlessinger K, Johnson VP, Arreaza G, Liu F, Levitan D, Wang L, van Heek M, Erion M, Wang Y, Kelley DE. Phenotyping of adipose, liver, and skeletal muscle insulin resistance and response to pioglitazone in spontaneously obese rhesus monkeys. Am J Physiol Endocrinol Metab 2017; 312:E235-E243. [PMID: 28143858 DOI: 10.1152/ajpendo.00398.2016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 01/23/2017] [Accepted: 01/23/2017] [Indexed: 01/29/2023]
Abstract
Insulin resistance and diabetes can develop spontaneously with obesity and aging in rhesus monkeys, highly similar to the natural history of obesity, insulin resistance, and progression to type 2 diabetes in humans. The current studies in obese rhesus were undertaken to assess hepatic and adipose contributions to systemic insulin resistance-currently, a gap in our knowledge-and to benchmark the responses to pioglitazone (PIO). A two-step hyperinsulinemic-euglycemic clamp, with tracer-based glucose flux estimates, was used to measure insulin resistance, and in an intervention study was repeated following 6 wk of PIO treatment (3 mg/kg). Compared with lean healthy rhesus, obese rhesus has a 60% reduction of glucose utilization during a high insulin infusion and markedly impaired suppression of lipolysis, which was evident at both low and high insulin infusion. However, obese dysmetabolic rhesus manifests only mild hepatic insulin resistance. Six-week PIO treatment significantly improved skeletal muscle and adipose insulin resistance (by ~50%). These studies strengthen the concept that insulin resistance in obese rhesus closely resembles human insulin resistance and indicate the value of obese rhesus for appraising new insulin-sensitizing therapeutics.
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Affiliation(s)
- Jin Shang
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
| | | | | | - Keefe Chng
- Crown Bioscience, Incorporated, Kannapolis, North Carolina
| | - Yonghua Zhu
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
| | - Sandra C Souza
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
| | - Michael Staup
- Crown Bioscience, Incorporated, Kannapolis, North Carolina
| | - Ying Chen
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
| | - Dan Xie
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
| | | | | | | | - Gladys Arreaza
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
| | - Franklin Liu
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
| | - Diane Levitan
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
| | - Liangsu Wang
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
| | | | - Mark Erion
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
| | - Yixin Wang
- Crown Bioscience, Incorporated, Kannapolis, North Carolina
| | - David E Kelley
- Merck & Company, Incorporated, Kenilworth, New Jersey; and
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Kunasegaran T, Mustafa MR, Achike FI, Murugan DD. Quercetin and pioglitazone synergistically reverse endothelial dysfunction in isolated aorta from fructose-streptozotocin (F-STZ)-induced diabetic rats. Eur J Pharmacol 2017; 799:160-170. [DOI: 10.1016/j.ejphar.2017.02.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 02/11/2017] [Accepted: 02/13/2017] [Indexed: 12/15/2022]
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Kochunov P, Wey HY, Fox PT, Lancaster JL, Davis MD, Wang DJJ, Lin AL, Bastarrachea RA, Andrade MCR, Mattern V, Frost P, Higgins PB, Comuzzie AG, Voruganti VS. Changes in Cerebral Blood Flow during an Alteration in Glycemic State in a Large Non-human Primate ( Papio hamadryas sp.). Front Neurosci 2017; 11:49. [PMID: 28261040 PMCID: PMC5306336 DOI: 10.3389/fnins.2017.00049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 01/23/2017] [Indexed: 11/24/2022] Open
Abstract
Changes in cerebral blood flow (CBF) during a hyperglycemic challenge were mapped, using perfusion-weighted MRI, in a group of non-human primates. Seven female baboons were fasted for 16 h prior to 1-h imaging experiment, performed under general anesthesia, that consisted of a 20-min baseline, followed by a bolus infusion of glucose (500 mg/kg). CBF maps were collected every 7 s and blood glucose and insulin levels were sampled at regular intervals. Blood glucose levels rose from 51.3 ± 10.9 to 203.9 ± 38.9 mg/dL and declined to 133.4 ± 22.0 mg/dL, at the end of the experiment. Regional CBF changes consisted of four clusters: cerebral cortex, thalamus, hypothalamus, and mesencephalon. Increases in the hypothalamic blood flow occurred concurrently with the regulatory response to systemic glucose change, whereas CBF declined for other clusters. The return to baseline of hypothalamic blood flow was observed while CBF was still increasing in other brain regions. The spatial pattern of extra-hypothalamic CBF changes was correlated with the patterns of several cerebral networks including the default mode network. These findings suggest that hypothalamic blood flow response to systemic glucose levels can potentially be explained by regulatory activity. The response of extra-hypothalamic clusters followed a different time course and its spatial pattern resembled that of the default-mode network.
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Affiliation(s)
- Peter Kochunov
- Maryland Psychiatric Research Center, University of Maryland School of MedicineBaltimore, MA, USA; Research Imaging Institute, University of Texas Health Science Center at San AntonioSan Antonio, TX, USA; Southwest National Primate Research CenterSan Antonio, TX, USA
| | - Hsiao-Ying Wey
- Research Imaging Institute, University of Texas Health Science Center at San AntonioSan Antonio, TX, USA; Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical SchoolCharlestown, MA, USA
| | - Peter T Fox
- Research Imaging Institute, University of Texas Health Science Center at San Antonio San Antonio, TX, USA
| | - Jack L Lancaster
- Research Imaging Institute, University of Texas Health Science Center at San Antonio San Antonio, TX, USA
| | - Michael D Davis
- Research Imaging Institute, University of Texas Health Science Center at San Antonio San Antonio, TX, USA
| | - Danny J J Wang
- Ahmanson-Lovelace Brain Mapping Center, University of California at Los AngelesLos Angeles, CA, USA; Mark and Mary Stevens Neuroimaging and Informatics Institute, Keck School of Medicine, University of Southern CaliforniaLos Angeles, CA, USA
| | - Ai-Ling Lin
- Research Imaging Institute, University of Texas Health Science Center at San Antonio San Antonio, TX, USA
| | - Raul A Bastarrachea
- Southwest National Primate Research CenterSan Antonio, TX, USA; Department of Genetics, Texas Biomedical Research InstituteSan Antonio, TX, USA
| | - Marcia C R Andrade
- Department of Genetics, Texas Biomedical Research InstituteSan Antonio, TX, USA; Center for Laboratory Animal Breeding, Oswaldo Cruz FoundationRio de Janeiro, Brazil
| | - Vicki Mattern
- Department of Genetics, Texas Biomedical Research Institute San Antonio, TX, USA
| | - Patrice Frost
- Southwest National Primate Research Center San Antonio, TX, USA
| | - Paul B Higgins
- Department of Genetics, Texas Biomedical Research Institute San Antonio, TX, USA
| | - Anthony G Comuzzie
- Southwest National Primate Research CenterSan Antonio, TX, USA; Department of Genetics, Texas Biomedical Research InstituteSan Antonio, TX, USA
| | - Venkata S Voruganti
- Department of Nutrition and UNC Nutrition Research Institute, University of North Carolina at Chapel Hill Kannapolis, NC, USA
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Yu EN, Winnick JJ, Edgerton DS, Scott MF, Smith MS, Farmer B, Williams PE, Cherrington AD, Moore MC. Hepatic and Whole-Body Insulin Metabolism during Proestrus and Estrus in Mongrel Dogs. Comp Med 2016; 66:235-240. [PMID: 27298249 PMCID: PMC4907533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 10/11/2015] [Accepted: 10/22/2015] [Indexed: 06/06/2023]
Abstract
Insulin resistance occurs during various stages of the estrus cycle in dogs. To quantify the effects of proestrus-estrus (PE) and determine whether PE affects liver insulin sensitivity, 11 female mongrel dogs were implanted with sampling and intraportal infusion catheters. Five of the dogs (PE group) entered proestrus after surgery; those remaining in anestrus were controls. The dogs were fasted overnight, [3-(3)H]glucose and somatostatin were infused through peripheral veins, and glucagon was infused intraportally. Insulin was infused intraportally, with the rate adjusted to maintain arterial plasma glucose at basal levels (PE, 294±25 μU/kg/min; control, 223±21 μU/kg/min). Subsequently the insulin infusion rate was increased by 0.2 mU/kg/min for 120 min (P1) and then to 1.5 mU/kg/min for the last 120 min (P2); glucose was infused peripherally as needed to maintain euglycemia. Insulin concentrations did not differ between groups at any time; they increased 3 μU/mL over baseline during P1 and to 3 times baseline during P2. The glucose infusion rate in PE dogs during P2 was 63% of that in control dogs. Net hepatic glucose output and the endogenous glucose production rate declined 40% to 50% from baseline in both groups during P1; during P2, both groups exhibited a low rate of net hepatic glucose uptake with full suppression of endogenous glucose production. The glucose disappearance rate during P1 and P2 was 35% greater in control than PE dogs. Therefore, PE in canines is associated with loss of nonhepatic (primarily muscle) but not hepatic insulin sensitivity.
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Affiliation(s)
- Erin Nz Yu
- Departments of Pathology, Microbiology, Immunology, and Division of Animal Care, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Jason J Winnick
- Departments of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Dale S Edgerton
- Departments of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA; Diabetes Research and Training Center, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Melanie F Scott
- Departments of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Marta S Smith
- Departments of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Ben Farmer
- Departments of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA; Diabetes Research and Training Center, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Phillip E Williams
- Diabetes Research and Training Center, Vanderbilt University School of Medicine, Nashville, Tennessee, USA; Department of Surgery, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Alan D Cherrington
- Departments of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Mary Courtney Moore
- Departments of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
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Wannasiri S, Piyabhan P, Naowaboot J. Rhinacanthus nasutus leaf improves metabolic abnormalities in high-fat diet-induced obese mice. Asian Pac J Trop Biomed 2016. [DOI: 10.1016/j.apjtb.2015.10.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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