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Saidj S, Ruchat SM, Henderson M, Tremblay A, Mathieu ME. Physiological response during exercise is preserved in children exposed to a suboptimal gestational environment. Obesity (Silver Spring) 2024; 32:1551-1557. [PMID: 39045675 DOI: 10.1002/oby.24049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 04/05/2024] [Accepted: 04/06/2024] [Indexed: 07/25/2024]
Abstract
OBJECTIVE This study investigated whether exposure to suboptimal gestational factors (SGFs) alters mechanical efficiency (ME) and substrate oxidation during rest and exercise in children as a mechanism contributing to obesity. METHODS Data from the Quebec Adiposity and Lifestyle Investigation in Youth cohort were used. Children aged 8 to 10 years performed an incremental maximal cycling test with indirect calorimetry. Their ME was measured during submaximal and maximal effort. The substrate oxidation during rest and submaximal effort was also computed. ME and substrate oxidation results between children exposed to each SGF during pregnancy (gestational diabetes mellitus: n = 68; hypertensive disorders: n = 49; maternal smoking: n = 77) and nonexposed children (n = 370) were compared. RESULTS No difference was observed for ME during submaximal (F[3,540] = 0.46, p = 0.713) and maximal effort (F[3,545] = 0.86, p = 0.463) between exposed and nonexposed children. The percentage contributions of lipids and carbohydrates did not differ during rest (F[3,545] =1.68, p = 0.169) or submaximal exercise (F[3,544] = 0.31, p = 0.534) between exposed and nonexposed children. CONCLUSIONS Children exposed to investigated SGFs display a similar physiological response regarding ME and substrate oxidation during rest and exercise compared to nonexposed children. Future studies should confirm these novel results and continue investigating other research avenues to explain the higher risk of obesity in this population.
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Affiliation(s)
- Soraya Saidj
- School of Kinesiology and Physical Activity Sciences, Faculty of Medicine, Université de Montréal, Montréal, Québec, Canada
| | - Stephanie-May Ruchat
- Department of Human Kinetics, Université du Québec à Trois-Rivières, Trois-Rivières, Québec, Canada
| | - Mélanie Henderson
- Azrieli Research Center, Sainte-Justine University Hospital Center, Montréal, Québec, Canada
- Department of Pediatrics, Faculty of Medicine, Université de Montréal, Montreal, Québec, Canada
- School of Public Health, Université de Montréal, Montreal, Québec, Canada
| | - Angelo Tremblay
- Department of Kinesiology, Faculty of Medicine, Université de Laval, Québec City, Québec, Canada
| | - Marie-Eve Mathieu
- School of Kinesiology and Physical Activity Sciences, Faculty of Medicine, Université de Montréal, Montréal, Québec, Canada
- Azrieli Research Center, Sainte-Justine University Hospital Center, Montréal, Québec, Canada
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2
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Yu HT, Xu WH, Gong JY, Chen YF, He Y, Chen ST, Wu YY, Liu GL, Zhang HY, Xie L. Effect of high-fat diet on the fatty acid profiles of brain in offspring mice exposed to maternal gestational diabetes mellitus. Int J Obes (Lond) 2024; 48:849-858. [PMID: 38341506 DOI: 10.1038/s41366-024-01486-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Revised: 01/11/2024] [Accepted: 01/25/2024] [Indexed: 02/12/2024]
Abstract
OBJECTIVE Fatty acids play a critical role in the proper functioning of the brain. This study investigated the effects of a high-fat (HF) diet on brain fatty acid profiles of offspring exposed to maternal gestational diabetes mellitus (GDM). METHODS Insulin receptor antagonist (S961) and HF diet were used to establish the GDM animal model. Brain fatty acid profiles of the offspring mice were measured by gas chromatography at weaning and adulthood. Protein expressions of the fatty acid transport pathway Wnt3/β-catenin and the target protein major facilitator superfamily domain-containing 2a (MFSD2a) were measured in the offspring brain by Western blot. RESULTS Maternal GDM increased the body weight of male offspring (P < 0.05). In weaning offspring, factorial analysis showed that maternal GDM increased the monounsaturated fatty acid (MUFA) percentage of the weaning offspring's brain (P < 0.05). Maternal GDM decreased offspring brain arachidonic acid (AA), but HF diet increased brain linoleic acid (LA) (P < 0.05). Maternal GDM and HF diet reduced offspring brain docosahexaenoic acid (DHA), and the male offspring had higher DHA than the female offspring (P < 0.05). In adult offspring, factorial analysis showed that HF diet increased brain MUFA in offspring, and male offspring had higher brain MUFA than female offspring (P < 0.05). The HF diet increased brain LA in the offspring. Male offspring had higher level of AA than female offspring (P < 0.05). HF diet reduced DHA in the brains of female offspring. The brain protein expression of β-catenin and MFSD2a in both weaning and adult female offspring was lower in the HF + GDM group than in the CON group (P < 0.05). CONCLUSIONS Maternal GDM increased the susceptibility of male offspring to HF diet-induced obesity. HF diet-induced adverse brain fatty acid profiles in both male and female offspring exposed to GDM.
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Affiliation(s)
- Hai-Tao Yu
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Wen-Hui Xu
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Jia-Yu Gong
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Yi-Fei Chen
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Yuan He
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Shu-Tong Chen
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Yan-Yan Wu
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Guo-Liang Liu
- Experimental Teaching Center for Preventive Medicine, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Hai-Ying Zhang
- Experimental Teaching Center for Radiation Medicine, School of Public Health, Jilin University, Changchun, 130021, Jilin, China
| | - Lin Xie
- Department of Nutrition and Food Hygiene, School of Public Health, Jilin University, Changchun, 130021, Jilin, China.
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3
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Gao M, Wang H, Li W, Wang L, Li N, Qiao Y, Zhang T, Li J, Yu Z, Hu G, Leng J, Yang X. Maternal insulin resistance and maternal β-cell function during pregnancy for offspring overweight before 2 years of age among women with gestational diabetes. Pediatr Obes 2023; 18:e12995. [PMID: 36523130 DOI: 10.1111/ijpo.12995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 11/21/2022] [Accepted: 11/30/2022] [Indexed: 12/23/2022]
Abstract
OBJECTIVE To explore associations of maternal insulin resistance and β-cell dysfunction with offspring overweight before 24 months of age among children of Chinese women with gestational diabetes mellitus (GDM). METHODS Offspring of women with GDM (n = 901) who were enrolled in a lifestyle trial during pregnancy were followed up to 24 months of age in Tianjin, China. Restricted cubic spline analysis was performed to examine full-range associations of maternal homeostatic model assessment of insulin resistance (HOMA-IR) and β-cell function (HOMA-%β) with childhood overweight. Logistic regression was performed to obtain the odds ratios (ORs) and 95% confidence interval (CI) of maternal high HOMA-IR and low HOMA-%β at diagnosis of GDM for offspring overweight within 12 months of age and at 13-24 months of age. RESULTS Maternal high HOMA-IR was associated with an increased risk of offspring being overweight within 12 months of age and at 13-24 months of age (OR: 1.71, 95%CI: 1.12-2.62 & 1.89, 1.13-3.17, respectively). Maternal low HOMA-%β was associated with an increased risk of offspring being overweight at 13-24 months of age (1.64, 1.05-2.55). CONCLUSIONS Both maternal increased insulin resistance and decreased β-cell function at diagnosis of GDM were associated with elevated risk of offspring overweight in early childhood among Chinese women with GDM.
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Affiliation(s)
- Ming Gao
- Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China
| | - Hui Wang
- Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China
| | - Weiqin Li
- Project Office, Tianjin Women and Children's Health Centre, Tianjin, China
| | - Leishen Wang
- Project Office, Tianjin Women and Children's Health Centre, Tianjin, China
| | - Ninghua Li
- Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China
| | - Yijuan Qiao
- Project Office, Tianjin Women and Children's Health Centre, Tianjin, China
| | - Tao Zhang
- Project Office, Tianjin Women and Children's Health Centre, Tianjin, China
| | - Jing Li
- Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China.,Tianjin Center for International Collaborative Research on Environment, Nutrition and Public Health, Tianjin Medical University, Tianjin, China.,Tianjin Key Laboratory of Environment, Nutrition and Public Health, Tianjin Medical University, Tianjin, China
| | - Zhijie Yu
- Population Cancer Research Program, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Gang Hu
- Chronic Disease Epidemiology Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana, USA
| | - Junhong Leng
- Project Office, Tianjin Women and Children's Health Centre, Tianjin, China
| | - Xilin Yang
- Department of Epidemiology and Biostatistics, School of Public Health, Tianjin Medical University, Tianjin, China.,Tianjin Center for International Collaborative Research on Environment, Nutrition and Public Health, Tianjin Medical University, Tianjin, China.,Tianjin Key Laboratory of Environment, Nutrition and Public Health, Tianjin Medical University, Tianjin, China
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Genomics and Epigenomics of Gestational Diabetes Mellitus: Understanding the Molecular Pathways of the Disease Pathogenesis. Int J Mol Sci 2022; 23:ijms23073514. [PMID: 35408874 PMCID: PMC8998752 DOI: 10.3390/ijms23073514] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/01/2022] [Accepted: 03/04/2022] [Indexed: 11/16/2022] Open
Abstract
One of the most common complications during pregnancy is gestational diabetes mellitus (GDM), hyperglycemia that occurs for the first time during pregnancy. The condition is multifactorial, caused by an interaction between genetic, epigenetic, and environmental factors. However, the underlying mechanisms responsible for its pathogenesis remain elusive. Moreover, in contrast to several common metabolic disorders, molecular research in GDM is lagging. It is important to recognize that GDM is still commonly diagnosed during the second trimester of pregnancy using the oral glucose tolerance test (OGGT), at a time when both a fetal and maternal pathophysiology is already present, demonstrating the increased blood glucose levels associated with exacerbated insulin resistance. Therefore, early detection of metabolic changes and associated epigenetic and genetic factors that can lead to an improved prediction of adverse pregnancy outcomes and future cardio-metabolic pathologies in GDM women and their children is imperative. Several genomic and epigenetic approaches have been used to identify the genes, genetic variants, metabolic pathways, and epigenetic modifications involved in GDM to determine its etiology. In this article, we explore these factors as well as how their functional effects may contribute to immediate and future pathologies in women with GDM and their offspring from birth to adulthood. We also discuss how these approaches contribute to the changes in different molecular pathways that contribute to the GDM pathogenesis, with a special focus on the development of insulin resistance.
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Katus U, Villa I, Ringmets I, Veidebaum T, Harro J. Neuropeptide Y gene variants in obesity, dietary intake, blood pressure, lipid and glucose metabolism: A longitudinal birth cohort study. Peptides 2021; 139:170524. [PMID: 33652060 DOI: 10.1016/j.peptides.2021.170524] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 02/24/2021] [Accepted: 02/24/2021] [Indexed: 12/29/2022]
Abstract
OBJECTIVE Neuropeptide Y affects several physiological functions, notably appetite regulation. We analysed the association between four single nucleotide polymorphisms (SNP) in the NPY gene (rs5574, rs16147, rs16139, rs17149106) and measures of obesity, dietary intake, physical activity, blood pressure, glucose and lipid metabolism from adolescence to young adulthood. METHODS The sample included both birth cohorts of the Estonian Children Personality Behaviour and Health Study at ages 15 (n = 1075 with available complete data), 18 (n = 913) and 25 (n = 926) years. Linear mixed-effects regression models were used for longitudinal association between NPY SNP-s and variables of interest. Associations at ages 15, 18 and 25 were analysed by ANOVA. RESULTS Rs5574 CC-homozygotes had a greater increase per year in waist-to-hip ratio (WHR) and a smaller decrease in daily energy intake and carbohydrate intake from age 15-25 years; fasting glucose and cholesterol were higher in rs5574 CC-homozygotes. Rs16147 TT-homozygotes had higher body weight and a greater increase in sum of 5 skinfolds, waist circumference, WHR and waist-to-height ratio; however, they had lower carbohydrate intake throughout the observation period. Rs16147 TT-homozygotes and both rs16139 and rs17149106 heterozygotes had higher triglyceride levels. All NPY SNP-s were associated with blood pressure: rs5574 TT-and rs16147 CC-homozygotes had a smaller increase in diastolic blood pressure, while rs16139 and rs17149106 heterozygous had lower blood pressure throughout the study. CONCLUSION Variants of the NPY gene were associated with measures of obesity, dietary intake, glucose and lipid metabolism and blood pressure from adolescence to young adulthood.
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Affiliation(s)
- Urmeli Katus
- Department of Family Medicine and Public Health, Faculty of Medicine, University of Tartu, Tartu, Estonia
| | - Inga Villa
- Department of Family Medicine and Public Health, Faculty of Medicine, University of Tartu, Tartu, Estonia
| | - Inge Ringmets
- Department of Family Medicine and Public Health, Faculty of Medicine, University of Tartu, Tartu, Estonia
| | - Toomas Veidebaum
- Department of Chronic Diseases, National Institute for Health Development, Tallinn, Estonia
| | - Jaanus Harro
- Chair of Neuropsychopharmacology, Institute of Chemistry, University of Tartu, Tartu, Estonia.
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6
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Maragkoudaki X, Naylor M, Papacleovoulou G, Stolarczyk E, Rees D, Pombo JM, Abu-Hayyeh S, Czajka A, Howard JK, Malik AN, Williamson C, Poston L, Taylor PD. Supplementation with a prebiotic (polydextrose) in obese mouse pregnancy improves maternal glucose homeostasis and protects against offspring obesity. Int J Obes (Lond) 2020; 44:2382-2393. [PMID: 33033395 DOI: 10.1038/s41366-020-00682-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 07/08/2020] [Accepted: 09/04/2020] [Indexed: 12/29/2022]
Abstract
OBJECTIVES We hypothesised that maternal diet-induced-obesity has adverse consequences for offspring energy expenditure and susceptibility to obesity in adulthood, and that the prebiotic polydextrose (PDX) would prevent the consequences of programming by maternal obesity. METHODS Female mice were fed a control (Con) or obesogenic diet (Ob) for 6 weeks prior to mating and throughout pregnancy and lactation. Half the obese dams were supplemented with 5% PDX (ObPDX) in drinking water throughout pregnancy and lactation. Offspring were weaned onto standard chow. At 3 and 6 months, offspring energy intake (EI) and energy expenditure (EE by indirect calorimetry) were measured, and a glucose-tolerance test performed. Offspring of control (OffCon), obese (OffOb) and PDX supplemented (OffObP) dams were subsequently challenged for 3 weeks with Ob, and energy balanced reassessed. Potential modifiers of offspring energy balance including gut microbiota and biomarkers of mitochondrial activity were also evaluated. RESULTS Six-month-old male OffOb demonstrated increased bodyweight (BW, P < 0.001) and white adipose tissue mass (P < 0.05), decreased brown adipose tissue mass (BAT, P < 0.01), lower night-time EE (P < 0.001) versus OffCon, which were prevented in OffObP. Both male and female OffOb showed abnormal glucose-tolerance test (peak [Glucose] P < 0.001; AUC, P < 0.05) which was prevented by PDX. The Ob challenge resulted in greater BW gain in both male and female OffOb versus OffCon (P < 0.05), also associated with increased EI (P < 0.05) and reduced EE in females (P < 0.01). OffObP were protected from accelerated BW gain on the OB diet compared with controls, associated with increased night-time EE in both male (P < 0.05) and female OffObP (P < 0.001). PDX also prevented an increase in skeletal muscle mtDNA copy number in OffOb versus OffCon (P < 0.01) and increased the percentage of Bacteroides cells in faecal samples from male OffObP relative to controls. CONCLUSIONS Maternal obesity adversely influences adult offspring energy balance and propensity for obesity, which is ameliorated by maternal PDX treatment with associated changes in gut microbiota composition and skeletal muscle mitochondrial function.
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Affiliation(s)
- Xanthi Maragkoudaki
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Matthew Naylor
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Georgia Papacleovoulou
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Emilie Stolarczyk
- Department of Diabetes Research, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Douglas Rees
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Joaquim M Pombo
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Shadi Abu-Hayyeh
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Anja Czajka
- Department of Diabetes Research, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Jane K Howard
- Department of Diabetes Research, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Afshan N Malik
- Department of Diabetes Research, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Catherine Williamson
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Lucilla Poston
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK
| | - Paul D Taylor
- Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, London, UK.
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7
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Girgis CM, Cha KM, So B, Tsang M, Chen J, Houweling PJ, Schindeler A, Stokes R, Swarbrick MM, Evesson FJ, Cooper ST, Gunton JE. Mice with myocyte deletion of vitamin D receptor have sarcopenia and impaired muscle function. J Cachexia Sarcopenia Muscle 2019; 10:1228-1240. [PMID: 31225722 PMCID: PMC6903451 DOI: 10.1002/jcsm.12460] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 05/14/2019] [Accepted: 05/14/2019] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND It has long been recognized that vitamin D deficiency is associated with muscle weakness and falls. Vitamin D receptor (VDR) is present at very low levels in normal muscle. Whether vitamin D plays a direct role in muscle function is unknown and is a subject of hot debate. Myocyte-specific deletion of VDR would provide a strategy to answer this question. METHODS Myocyte-specific vitamin D receptor (mVDR) null mice were generated by crossing human skeletal actin-Cre mice with floxed VDR mice. The effects of gene deletion on the muscle phenotype were studied in terms of body tissue composition, muscle tissue histology, and gene expression by real-time PCR. RESULTS Unlike whole-body VDR knockout mice, mVDR mice showed a normal body size. The mVDR showed a distinct muscle phenotype featuring reduced proportional lean mass (70% vs. 78% of lean mass), reduced voluntary wheel-running distance (22% decrease, P = 0.009), reduced average running speed, and reduced grip strength (7-16% reduction depending on age at testing). With their decreased voluntary exercise, and decreased lean mass, mVDR have increased proportional fat mass at 20% compared with 13%. Surprisingly, their muscle fibres showed slightly increased diameter, as well as the presence of angular fibres and central nuclei suggesting ongoing remodelling. There were, however, no clear changes in fibre type and there was no increase in muscle fibrosis. VDR is a transcriptional regulator, and changes in the expression of candidate genes was examined in RNA extracted from skeletal muscle. Alterations were seen in myogenic gene expression, and there was decreased expression of cell cycle genes cyclin D1, D2, and D3 and cyclin-dependent kinases Cdk-2 and Cdk-4. Expression of calcium handling genes sarcoplasmic/endoplasmic reticulum calcium ATPases (SERCA) Serca2b and Serca3 was decreased and Calbindin mRNA was lower in mVDR muscle. CONCLUSIONS This study demonstrates that vitamin D signalling is needed for myocyte function. Despite the low level of VDR protein normally found muscle, deleting myocyte VDR had important effects on muscle size and strength. Maintenance of normal vitamin D signalling is a useful strategy to prevent loss of muscle function and size.
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Affiliation(s)
- Christian M Girgis
- Department of Diabetes and Endocrinology, Westmead Hospital, Sydney, New South Wales, Australia.,Faculty of Health and Medicine, The University of Sydney, Sydney, New South Wales, Australia.,The Westmead Institute for Medical Research, The University of Sydney, Sydney, New South Wales, Australia.,Department of Diabetes and Endocrinology, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Kuan Minn Cha
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, New South Wales, Australia
| | - Benjamin So
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, New South Wales, Australia.,Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Michael Tsang
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, New South Wales, Australia
| | - Jennifer Chen
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, New South Wales, Australia
| | - Peter J Houweling
- Murdoch Children's Research Institute, Royal Children's Hospital, Melbourne, Victoria, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, Victoria, Australia
| | - Aaron Schindeler
- Faculty of Health and Medicine, The University of Sydney, Sydney, New South Wales, Australia.,Orthopaedic Research and Biotechnology Unit, The Children's Hospital at Westmead, Sydney, Westmead, Australia
| | - Rebecca Stokes
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, New South Wales, Australia
| | - Michael M Swarbrick
- Faculty of Health and Medicine, The University of Sydney, Sydney, New South Wales, Australia.,The Westmead Institute for Medical Research, The University of Sydney, Sydney, New South Wales, Australia
| | - Frances J Evesson
- Faculty of Health and Medicine, The University of Sydney, Sydney, New South Wales, Australia.,Kids Neuroscience Centre, The Children's Hospital at Westmead, The Discipline of Child and Adolescent Health, Children's Medical Research Institute, The University of Sydney, Sydney, New South Wales, Australia
| | - Sandra T Cooper
- Faculty of Health and Medicine, The University of Sydney, Sydney, New South Wales, Australia.,Kids Neuroscience Centre, The Children's Hospital at Westmead, The Discipline of Child and Adolescent Health, Children's Medical Research Institute, The University of Sydney, Sydney, New South Wales, Australia
| | - Jenny E Gunton
- Department of Diabetes and Endocrinology, Westmead Hospital, Sydney, New South Wales, Australia.,Faculty of Health and Medicine, The University of Sydney, Sydney, New South Wales, Australia.,The Westmead Institute for Medical Research, The University of Sydney, Sydney, New South Wales, Australia.,Division of Immunology, Garvan Institute of Medical Research, Sydney, New South Wales, Australia
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8
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Scott CH, Cha KM, Ngai J, Jiang C, Cheng K, Stokes RA, Ho KWK, George J, Gonzalez FJ, Gunton JE. Hepatic Aryl hydrocarbon Receptor Nuclear Translocator (ARNT) regulates metabolism in mice. PLoS One 2017; 12:e0186543. [PMID: 29190746 PMCID: PMC5708799 DOI: 10.1371/journal.pone.0186543] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 09/11/2017] [Indexed: 01/09/2023] Open
Abstract
Background & aims Aryl hydrocarbon Receptor Nuclear Translocator (ARNT) and its partners hypoxia-inducible factors (HIF)-1α and HIF-2α are candidate factors for the well-known link between the liver, metabolic dysfunction and elevation in circulating lipids and glucose. Methods: Hepatocyte-specific ARNT-null (LARNT), HIF-1α-null (LHIF1α) and HIF-2α-null (LHIF2α) mice were created. Results LARNT mice had increased fasting glucose, impaired glucose tolerance, increased glucose production, raised post-prandial serum triglycerides (TG) and markedly lower hepatic ATP versus littermate controls. There was increased expression of G6Pase, Chrebp, Fas and Scd-1 mRNAs in LARNT animals. Surprisingly, LHIF1α and LHIF2α mice exhibited no alterations in any metabolic parameter assessed. Conclusions These results provide convincing evidence that reduced hepatic ARNT can contribute to inappropriate hepatic glucose production and post-prandial dyslipidaemia. Hepatic ARNT may be a novel therapeutic target for improving post-prandial hypertriglyceridemia and glucose homeostasis.
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Affiliation(s)
- Christopher H. Scott
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, NSW. Australia
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Kuan-Minn Cha
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, NSW. Australia
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Jason Ngai
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Changtao Jiang
- Laboratory of Metabolism, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Kim Cheng
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, NSW. Australia
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Rebecca A. Stokes
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, NSW. Australia
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Kenneth W. K. Ho
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Jacob George
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, NSW. Australia
- Storr Liver Unit, Westmead Institute for Medical Research, The University of Sydney, Sydney, NSW. Australia
| | - Frank J. Gonzalez
- Laboratory of Metabolism, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Jenny E. Gunton
- The Westmead Institute for Medical Research, The University of Sydney, Sydney, NSW. Australia
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research, Sydney, NSW, Australia
- St. Vincent’s Clinical School, University of NSW, Sydney, NSW, Australia
- Department of Diabetes and Endocrinology, Westmead Hospital, Sydney, NSW Australia
- * E-mail:
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9
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Sun WW, Zhu P, Shi YC, Zhang CL, Huang XF, Liang SY, Song ZY, Lin S. Current views on neuropeptide Y and diabetes-related atherosclerosis. Diab Vasc Dis Res 2017; 14:277-284. [PMID: 28423914 DOI: 10.1177/1479164117704380] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Diabetes-induced atherosclerotic cardiovascular disease is the leading cause of death of diabetic patients. Neuronal regulation plays a critical role in glucose metabolism and cardiovascular function under physiological and pathological conditions, among which, neurotransmitter neuropeptide Y has been shown to be closely involved in these two processes. Elevated central neuropeptide Y level promotes food intake and reduces energy expenditure, thereby increasing adiposity. Neuropeptide Y is co-localized with noradrenaline in central and sympathetic nervous systems. As a major peripheral vascular contractive neurotransmitter, through interactions with its receptors, neuropeptide Y has been implicated in the pathology and progression of diabetes, by promoting the proliferation of endothelial cells and vascular fibrosis, which may contribute to diabetes-induced cardiovascular disease. Neuropeptide Y also participates in the pathogenesis of atherosclerosis, the major form of cardiovascular disease, via aggravating endothelial dysfunction, growth of vascular smooth muscle cells, formation of foam cells and platelets aggregation. This review highlights the causal role of neuropeptide Y and its receptor system in the development of diabetes mellitus and one of its complications: atherosclerotic cardiovascular disease. The information from this review provides both critical insights onto the mechanisms underlying the pathogenesis of atherosclerosis and evidence for the development of therapeutic strategies.
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Affiliation(s)
- Wei-Wei Sun
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Ping Zhu
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Yan-Chuan Shi
- 2 Neuroscience Division, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Chen-Liang Zhang
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Xu-Feng Huang
- 3 School of Health Sciences and Illawarra Health and Medical Research Institute, University of Wollongong Australia, Wollongong, NSW, Australia
| | - Shi-Yu Liang
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Zhi-Yuan Song
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Shu Lin
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
- 3 School of Health Sciences and Illawarra Health and Medical Research Institute, University of Wollongong Australia, Wollongong, NSW, Australia
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10
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Short KR, Teague AM, Fields DA, Lyons T, Chernausek SD. Lower resting energy expenditure and fat oxidation in Native American and Hispanic infants born to mothers with diabetes. J Pediatr 2015; 166:884-9. [PMID: 25648295 PMCID: PMC4380761 DOI: 10.1016/j.jpeds.2014.12.036] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 10/30/2014] [Accepted: 12/15/2014] [Indexed: 10/24/2022]
Abstract
OBJECTIVE To determine whether exposure to diabetes in utero affects resting energy expenditure (REE) and fuel oxidation in infants. STUDY DESIGN At 35 ± 5 days after birth, body composition and REE were measured in full-term offspring of Native American and Hispanic women with either well-controlled diabetes (13 girls, 11 boys) or normal healthy pregnancies (18 girls, 17 boys). RESULTS Control of dysglycemia during gestation in the women with diabetes mellitus met current clinical standards, shown by average glycated hemoglobin (5.9 ± 0.2%; 40.6 ± 2.3 mmol/mol). Infant body mass (offspring of women with diabetes: 4.78 ± 0.13, control offspring: 4.56 ± 0.08 kg) and body fatness (offspring of women with diabetes: 25.2 ± 0.6, control offspring: 24.2 ± 0.5 %) did not differ between groups. REE, adjusted for lean body mass, was 14% lower in offspring of women with diabetes (41.7 ± 2.3 kJ/h) than control offspring (48.6 ± 2.0, P = .025). Fat oxidation was 26% lower in offspring of women with diabetes (0.54 ± 0.05 g/h) than control offspring (0.76 ± 0.04, P < .01) but carbohydrate oxidation did not differ. Thus, fat oxidation accounted for a lower fraction of REE in the offspring of women with diabetes (49 ± 4%) than control offspring (60 ± 3%, P = .022). Mothers with diabetes were older and had higher prepregnancy body mass index than control mothers. CONCLUSIONS Well-controlled maternal diabetes did not significantly affect body mass or composition of offspring at 1-month old. However, infants with mothers with diabetes had reduced REE and fat oxidation, which could contribute to adiposity and future disease risk. Further studies are needed to assess the impact differences in age and higher prepregnancy body mass index.
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Affiliation(s)
- Kevin R. Short
- Section of Diabetes & Endocrinology, Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - April M. Teague
- Section of Diabetes & Endocrinology, Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - David A. Fields
- Section of Diabetes & Endocrinology, Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
| | - Timothy Lyons
- Section of Endocrinology, Department of Internal Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA,Centre for Experimental Medicine, Queen’s University Belfast, Belfast, Northern Ireland, UK
| | - Steven D. Chernausek
- Section of Diabetes & Endocrinology, Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
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11
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Donovan LE, Cundy T. Does exposure to hyperglycaemia in utero increase the risk of obesity and diabetes in the offspring? A critical reappraisal. Diabet Med 2015; 32:295-304. [PMID: 25381964 DOI: 10.1111/dme.12625] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/04/2014] [Indexed: 12/16/2022]
Abstract
BACKGROUND The idea that exposure to hyperglycaemia in utero is an important factor in the development of obesity and diabetes in the offspring has become entrenched as popular belief. AIM To appraise the literature supporting this hypothesis in the light of recent studies that have clarified the main drivers of obesity in children and adolescents. METHODS A review of published evidence from animal studies, human observational studies, systematic reviews and experimental trials that address the impact of diabetes (Types 1 and 2, genetic or gestational) on the future risk of obesity and/or glucose intolerance in the offspring. RESULTS Some animal studies support a relationship between exposure to hyperglycaemia in utero and future development of obesity and diabetes, but the results are inconsistent. Most of the human studies claiming to show a relationship have not taken into account important known confounders, such as maternal and paternal BMI. Evidence supporting a dose-response relationship between maternal hyperglycaemia exposure and obesity and diabetes in the offspring is weak, and there is no convincing evidence that treating gestational diabetes reduces the later risk of offspring obesity or glucose intolerance. CONCLUSIONS Exposure to hyperglycaemia in utero has minimal direct effect on the later risk of obesity and Type 2 diabetes. The increased risk of obesity in the offspring of women with Type 2 or gestational diabetes can be explained by confounding factors, such as parental obesity.
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Affiliation(s)
- L E Donovan
- Department of Medicine, Division of Endocrinology and Metabolism and Department of Obstetrics and Gynaecology, University of Calgary, Alberta, Canada
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12
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Lalwani A, Stokes RA, Lau SM, Gunton JE. Deletion of ARNT (Aryl hydrocarbon receptor nuclear translocator) in β-cells causes islet transplant failure with impaired β-cell function. PLoS One 2014; 9:e98435. [PMID: 24878748 PMCID: PMC4039512 DOI: 10.1371/journal.pone.0098435] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Accepted: 05/03/2014] [Indexed: 01/13/2023] Open
Abstract
Background Replacing β-cells by islet-transplantation can cure type 1 diabetes, but up to 70% of β-cells die within 10 days of transplantation. ARNT (Aryl hydrocarbon Receptor Nuclear Translocator) regulates β-cell function, and potentially survival. Lack of ARNT impairs the ability of β-cells to respond to physiological stress and potentiates the onset of diabetes, but the exact role of ARNT in graft outcome is unknown. Aim To investigate the effect of β-cell deletion of ARNT on graft outcomes. Methods Islets were isolated from donor mice which had β-cell specific ARNT-deletion (β-ARNT) or littermate floxed controls. The islets were transplanted into diabetic SCID recipients in ratios of (a) 3 donors: 1 recipient, (b) 1 donor: 1 recipient or (c) ½ of the islets from 1 donor: 1 recipient. After 28 days, the kidney containing the graft was removed (nephrectomy) to exclude regeneration of the endogenous pancreas. Results In the supra-physiological-mass model (3∶1), both groups achieved reasonable glycaemia, with slightly higher levels in β-ARNT-recipients. In adequate-mass model (1∶1), β-ARNT recipients had poor glucose control versus floxed-control recipients and versus the β-ARNT donors. In the low-β-cell-mass model (½:1) β-ARNT transplants completely failed, whereas controls had good outcomes. Unexpectedly, there was no difference in the graft insulin content or β-cell mass between groups indicating that the defect was not due to early altered β-cell survival. Conclusion Outcomes for islet transplants lacking β-cell ARNT were poor, unless markedly supra-physiological masses of islets were transplanted. In the 1∶1 transplant model, there was no difference in β-cell volume. This is surprising because transplants of islets lacking one of the ARNT-partners HIF-1α have increased apoptosis and decreased islet volume. ARNT also partners HIF-2α and AhR (aryl hydrocarbon receptor) to form active transcriptional complexes, and further work to understand the roles of HIF-2α and AhR in transplant outcomes is needed.
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Affiliation(s)
- Amit Lalwani
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research (GIMR), Sydney, Australia
- Faculty of Medicine, Westmead Hospital, University of Sydney, Sydney, Australia
| | - Rebecca A. Stokes
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research (GIMR), Sydney, Australia
| | - Sue Mei Lau
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research (GIMR), Sydney, Australia
- St Vincent’s Clinical School, University of New South Wales, Sydney, Australia
| | - Jenny E. Gunton
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research (GIMR), Sydney, Australia
- Faculty of Medicine, Westmead Hospital, University of Sydney, Sydney, Australia
- St Vincent’s Clinical School, University of New South Wales, Sydney, Australia
- Department of Diabetes and Endocrinology, Westmead Hospital, Sydney, Australia
- * E-mail:
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Girgis CM, Clifton-Bligh RJ, Mokbel N, Cheng K, Gunton JE. Vitamin D signaling regulates proliferation, differentiation, and myotube size in C2C12 skeletal muscle cells. Endocrinology 2014; 155:347-57. [PMID: 24280059 DOI: 10.1210/en.2013-1205] [Citation(s) in RCA: 154] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Vitamin D deficiency is linked to a range of muscle disorders including myalgia, muscle weakness, and falls. Humans with severe vitamin D deficiency and mice with transgenic vitamin D receptor (VDR) ablation have muscle fiber atrophy. However, molecular mechanisms by which vitamin D influences muscle function and fiber size remain unclear. A central question is whether VDR is expressed in skeletal muscle and is able to regulate transcription at this site. To address this, we examined key molecular and morphologic changes in C2C12 cells treated with 25-hydroxyvitamin D (25OHD) and 1,25-dihydroxyvitamin D (1,25(OH)(2)D). As well as stimulating VDR expression, 25(OH)D and 1,25(OH)(2)D dose-dependently increased expression of the classic vitamin D target cytochrome P450, family 24, subfamily A, polypeptide 1 (CYP24A1), demonstrating the presence of an autoregulatory vitamin D-endocrine system in these cells. Luciferase reporter studies demonstrated that cytochrome P450, family 27, subfamily B, polypeptide 1 (CYP27B1) was functional in these cells. Both 25OHD and 1,25(OH)(2)D altered C2C12 proliferation and differentiation. These effects were related to the increased expression of genes involved in G(0)/G(1) arrest (retinoblastoma protein [Rb], 1.3-fold; ATM, 1.5-fold, both P < .05), downregulation of mRNAs involved in G(1)/S transition, including myc and cyclin-D1 (0.7- and 0.8-fold, both P < .05) and reduced phosphorylation of Rb protein (0.3-fold, P < .005). After serum depletion, 1,25(OH)(2)D (100nM) suppressed myotube formation with decreased mRNAs for key myogenic regulatory factors (myogenin, 0.5-fold; myf5, 0.4-fold, P < .005) but led to a 1.8-fold increase in cross-sectional size of individual myotubes associated with markedly decreased myostatin expression (0.2-fold, P < .005). These data show that vitamin D signaling alters gene expression in C2C12 cells, with effects on proliferation, differentiation, and myotube size.
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Affiliation(s)
- Christian M Girgis
- Garvan Institute of Medical Research (C.M.G., N.M., K.C., J.E.G.), Sydney, New South Wales 2010, Australia; Faculty of Medicine (C.M.G., R.J.C.-B., J.E.G.), University of Sydney, Sydney, New South Wales 2008, Australia; The Kolling Institute of Medical Research (R.J.C.-B.) and Royal North Shore Hospital (R.J.C.-B.), Sydney, New South Wales 2065, Australia; Department of Endocrinology and Diabetes (J.E.G.), Westmead Hospital, Sydney, New South Wales 2145, Australia; and St Vincent's Clinical School (J.E.G.), University of New South Wales, Sydney, New South Wales 2052, Australia
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14
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Isganaitis E, Woo M, Ma H, Chen M, Kong W, Lytras A, Sales V, DeCoste-Lopez J, Lee KJ, Leatherwood C, Lee D, Fitzpatrick C, Gall W, Watkins S, Patti ME. Developmental programming by maternal insulin resistance: hyperinsulinemia, glucose intolerance, and dysregulated lipid metabolism in male offspring of insulin-resistant mice. Diabetes 2014; 63:688-700. [PMID: 24186867 PMCID: PMC3900545 DOI: 10.2337/db13-0558] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Maternal obesity and gestational diabetes mellitus (GDM) are associated with obesity and diabetes risk in offspring. We tested whether maternal insulin resistance, which frequently coexists with GDM and obesity, could independently contribute to dysregulation of offspring metabolism. Female mice haploinsufficient for insulin receptor substrate-1 (IRS1-het) are hyperinsulinemic and insulin resistant during pregnancy, despite normal plasma glucose and body weight, and thus serve as a model of isolated maternal insulin resistance. Wild-type (WT) offspring of IRS1-het dams insulin resistance-exposed [IR-exposed] were compared with WT offspring of WT dams. Despite no differences in adiposity, male IR-exposed pups were glucose intolerant (P = 0.04) and hyperinsulinemic (1.3-fold increase, P = 0.02) by 1 month of age and developed progressive fasting hyperglycemia. Moreover, male IR-exposed pups challenged with high-fat diet exhibited insulin resistance. Liver lipidomic analysis of 3-week-old IR-exposed males revealed increases in the 16:1n7 fraction of several lipid classes, suggesting increased Scd1 activity. By 6 months of age, IR-exposed males had increased lipid accumulation in liver as well as increased plasma refed fatty acids, consistent with disrupted lipid metabolism. Our results indicate that isolated maternal insulin resistance, even in the absence of hyperglycemia or obesity, can promote metabolic perturbations in male offspring.
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Affiliation(s)
- Elvira Isganaitis
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | - Melissa Woo
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | - Huijuan Ma
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | - Michael Chen
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | - Wen Kong
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | - Aristides Lytras
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | - Vicencia Sales
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | | | - Kyung-Ju Lee
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | - Cianna Leatherwood
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | - Deborah Lee
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | - Connor Fitzpatrick
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
| | | | | | - Mary-Elizabeth Patti
- Division of Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA
- Corresponding author: Mary-Elizabeth Patti,
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15
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Beta-cell ARNT is required for normal glucose tolerance in murine pregnancy. PLoS One 2013; 8:e77419. [PMID: 24204824 PMCID: PMC3812008 DOI: 10.1371/journal.pone.0077419] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 09/10/2013] [Indexed: 11/19/2022] Open
Abstract
AIMS Insulin secretion increases in normal pregnancy to meet increasing demands. Inability to increase beta-cell function results in gestational diabetes mellitus (GDM). We have previously shown that the expression of the transcription factor ARNT (Aryl-hydrocarbon Receptor Nuclear Translocator) is reduced in the islets of humans with type 2 diabetes. Mice with a beta-cell specific deletion of ARNT (β-ARNT mice) have impaired glucose tolerance secondary to defective insulin secretion. We hypothesised that ARNT is required to increase beta-cell function during pregnancy, and that β-ARNT mice would be unable to compensate for the beta-cell stress of pregnancy. The aims of this study were to investigate the mechanisms of ARNT regulation of beta-cell function and glucose tolerance in pregnancy. METHODS β-ARNT females were mated with floxed control (FC) males and FC females with β-ARNT males. RESULTS During pregnancy, β-ARNT mice had a marked deterioration in glucose tolerance secondary to defective insulin secretion. There was impaired beta-cell proliferation in late pregnancy, associated with decreased protein and mRNA levels of the islet cell-cycle regulator cyclinD2. There was also reduced expression of Irs2 and G6PI. In contrast, in control mice, pregnancy was associated with a 2.1-fold increase in ARNT protein and a 1.6-fold increase in cyclinD2 protein, and with increased beta-cell proliferation. CONCLUSIONS Islet ARNT increases in normal murine pregnancy and beta-cell ARNT is required for cyclinD2 induction and increased beta-cell proliferation in pregnancy.
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16
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Grasemann C, Devlin MJ, Rzeczkowska PA, Herrmann R, Horsthemke B, Hauffa BP, Grynpas M, Alm C, Bouxsein ML, Palmert MR. Parental diabetes: the Akita mouse as a model of the effects of maternal and paternal hyperglycemia in wildtype offspring. PLoS One 2012; 7:e50210. [PMID: 23209676 PMCID: PMC3509145 DOI: 10.1371/journal.pone.0050210] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Accepted: 10/16/2012] [Indexed: 11/18/2022] Open
Abstract
Aim/Hypothesis Maternal diabetes and high-fat feeding during pregnancy have been linked to later life outcomes in offspring. To investigate the effects of both maternal and paternal hyperglycemia on offspring phenotypes, we utilized an autosomal dominant mouse model of diabetes (hypoinsulinemic hyperglycemia in Akita mice). We determined metabolic and skeletal phenotypes in wildtype offspring of Akita mothers and fathers. Results Both maternal and paternal diabetes resulted in phenotypic changes in wildtype offspring. Phenotypic changes were more pronounced in male offspring than in female offspring. Maternal hyperglycemia resulted in metabolic and skeletal phenotypes in male wildtype offspring. Decreased bodyweight and impaired glucose tolerance were observed as were reduced whole body bone mineral density and reduced trabecular bone mass. Phenotypic changes in offspring of diabetic fathers differed in effect size from changes in offspring of diabetic mothers. Male wildtype offspring developed a milder metabolic phenotype, but a more severe skeletal phenotype. Female wildtype offspring of diabetic fathers were least affected. Conclusions Both maternal and paternal diabetes led to the development of metabolic and skeletal changes in wildtype offspring, with a greater effect of maternal diabetes on metabolic parameters and of paternal diabetes on skeletal development. The observed changes are unlikely to derive from Mendelian inheritance, since the investigated offspring did not inherit the Akita mutation. While fetal programming may explain the phenotypic changes in offspring exposed to maternal diabetes in-utero, the mechanism underlying the effect of paternal diabetes on wildtype offspring is unclear.
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Affiliation(s)
- Corinna Grasemann
- Kinderklinik II, Division of Paediatric Endocrinology, UK- Essen and The University of Duisburg-Essen, Essen, Germany.
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Gunton JE, Sisavanh M, Stokes RA, Satin J, Satin LS, Zhang M, Liu SM, Cai W, Cheng K, Cooney GJ, Laybutt DR, So T, Molero JC, Grey ST, Andres DA, Rolph MS, Mackay CR. Mice deficient in GEM GTPase show abnormal glucose homeostasis due to defects in beta-cell calcium handling. PLoS One 2012; 7:e39462. [PMID: 22761801 PMCID: PMC3386271 DOI: 10.1371/journal.pone.0039462] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2012] [Accepted: 05/21/2012] [Indexed: 11/29/2022] Open
Abstract
Aims and Hypothesis Glucose-stimulated insulin secretion from beta-cells is a tightly regulated process that requires calcium flux to trigger exocytosis of insulin-containing vesicles. Regulation of calcium handling in beta-cells remains incompletely understood. Gem, a member of the RGK (Rad/Gem/Kir) family regulates calcium channel handling in other cell types, and Gem over-expression inhibits insulin release in insulin-secreting Min6 cells. The aim of this study was to explore the role of Gem in insulin secretion. We hypothesised that Gem may regulate insulin secretion and thus affect glucose tolerance in vivo. Methods Gem-deficient mice were generated and their metabolic phenotype characterised by in vivo testing of glucose tolerance, insulin tolerance and insulin secretion. Calcium flux was measured in isolated islets. Results Gem-deficient mice were glucose intolerant and had impaired glucose stimulated insulin secretion. Furthermore, the islets of Gem-deficient mice exhibited decreased free calcium responses to glucose and the calcium oscillations seen upon glucose stimulation were smaller in amplitude and had a reduced frequency. Conclusions These results suggest that Gem plays an important role in normal beta-cell function by regulation of calcium signalling.
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Affiliation(s)
- Jenny E Gunton
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research, Sydney, Australia.
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