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McIlwraith EK, Belsham DD. Palmitate alters miR-2137 and miR-503-5p to induce orexigenic Npy in hypothalamic neuronal cell models: Rescue by oleate and docosahexaenoic acid. J Neuroendocrinol 2023; 35:e13271. [PMID: 37208960 DOI: 10.1111/jne.13271] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 03/29/2023] [Accepted: 03/30/2023] [Indexed: 05/21/2023]
Abstract
MicroRNAs (miRNAs) are short noncoding RNA implicated in the pathogenesis of obesity. One cause of obesity is excess exposure to the saturated fatty acid palmitate that can alter miRNA levels in the periphery. Palmitate also promotes obesity by acting on the hypothalamus, the central coordinator of energy homeostasis, to dysregulate hypothalamic feeding neuropeptides and induce ER stress and inflammatory signaling. We hypothesized that palmitate would alter hypothalamic miRNAs that control genes involved in energy homeostasis thereby contributing to the obesity-promoting effects of palmitate. We found that palmitate upregulated 20 miRNAs and downregulated six miRNAs in the orexigenic NPY/AgRP-expressing mHypoE-46 cell line. We focused on delineating the roles of miR-2137 and miR-503-5p, as they were strongly up- and downregulated by palmitate, respectively. Overexpression of miR-2137 increased Npy mRNA levels and downregulated Esr1 levels, while increasing C/ebpβ and Atf3 mRNA. Inhibiting miR-2137 had the opposite effect, except on Npy, which was unchanged. The most downregulated miRNA by palmitate, miR-503-5p, negatively regulated Npy mRNA levels. Exposure to the unsaturated fatty acids oleate or docosahexaenoic acid completely or partially blocked the effects of palmitate on miR-2137 and miR-503-5p as well as Npy, Agrp, Esr1, C/ebpβ and Atf3. MicroRNAs may therefore contribute to palmitate actions in dysregulating NPY/AgRP neurons. Effectively combating the deleterious effects of palmitate is crucial to help prevent or reduce the impact of obesity.
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Affiliation(s)
- Emma K McIlwraith
- Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Denise D Belsham
- Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
- Departments of Medicine and Obstetrics and Gynecology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
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2
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Lieder B, Čonka J, Reiner AT, Zabel V, Ameur D, Somoza MM, Šebeková K, Celec P, Somoza V. Long-Term Consumption of a Sugar-Sweetened Soft Drink in Combination with a Western-Type Diet Is Associated with Morphological and Molecular Changes of Taste Markers Independent of Body Weight Development in Mice. Nutrients 2022; 14:nu14030594. [PMID: 35276952 PMCID: PMC8837962 DOI: 10.3390/nu14030594] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 01/20/2022] [Accepted: 01/27/2022] [Indexed: 02/01/2023] Open
Abstract
We investigated whether the long-term intake of a typical sugar-sweetened soft drink (sugar-sweetened beverage, SSB) alters markers for taste function when combined with a standard diet (chow) or a model chow mimicking a Western diet (WD). Adult male CD1 mice had ad libitum access to tap water or SSB in combination with either the chow or the WD for 24 weeks. Energy intake from fluid and food was monitored three times a week. Cardiometabolic markers (body weight and composition, waist circumference, glucose and lipid profile, and blood pressure) were analyzed at the end of the intervention, as was the number and size of the fungiform papillae as well as mRNA levels of genes associated with the different cell types of taste buds and taste receptors in the circumvallate papillae using a cDNA microarray and qPCR. Although the overall energy intake was higher in the WD groups, there was no difference in body weight or other cardiometabolic markers between the SSB and water groups. The chemosensory surface from the fungiform papillae was reduced by 36 ± 19% (p < 0.05) in the WD group after SSB compared to water intake. In conclusion, the consumption of the SSB reduced the chemosensory surface of the fungiform papillae of CD1 mice when applied in combination with a WD independent of body weight. The data suggest synergistic effects of a high sugar-high fat diet on taste dysfunction, which could further influence food intake and promote a vicious cycle of overeating and taste dysfunction.
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Affiliation(s)
- Barbara Lieder
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria; (A.T.R.); (V.Z.); (V.S.)
- Correspondence:
| | - Jozef Čonka
- Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University, 81101 Bratislava, Slovakia; (J.Č.); (K.Š.); (P.C.)
| | - Agnes T. Reiner
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria; (A.T.R.); (V.Z.); (V.S.)
| | - Victoria Zabel
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria; (A.T.R.); (V.Z.); (V.S.)
| | - Dominik Ameur
- Department of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria; (D.A.); (M.M.S.)
| | - Mark M. Somoza
- Department of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria; (D.A.); (M.M.S.)
- Leibniz Institute for Food Systems Biology at the Technical University of Munich, 85345 Freising, Germany
- Food Chemistry and Molecular Sensory Science, Technical University of Munich, 85345 Freising, Germany
| | - Katarína Šebeková
- Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University, 81101 Bratislava, Slovakia; (J.Č.); (K.Š.); (P.C.)
| | - Peter Celec
- Institute of Molecular Biomedicine, Faculty of Medicine, Comenius University, 81101 Bratislava, Slovakia; (J.Č.); (K.Š.); (P.C.)
| | - Veronika Somoza
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria; (A.T.R.); (V.Z.); (V.S.)
- Leibniz Institute for Food Systems Biology at the Technical University of Munich, 85345 Freising, Germany
- Nutritional Systems Biology, School of Life Sciences, Technical University of Munich, 85345 Freising, Germany
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Schipper L, van Heijningen S, Karapetsas G, van der Beek EM, van Dijk G. Individual housing of male C57BL/6J mice after weaning impairs growth and predisposes for obesity. PLoS One 2020; 15:e0225488. [PMID: 32453751 PMCID: PMC7250426 DOI: 10.1371/journal.pone.0225488] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 04/23/2020] [Indexed: 01/08/2023] Open
Abstract
For (metabolic) research models using mice, singly housing is widely used for practical purposes to study e.g. energy balance regulation and derangements herein. Mouse (social) housing practices could however influence study results by modulating (metabolic) health outcomes. To study the effects of the social housing condition, we assessed parameters for energy balance regulation and proneness to (diet induced) obesity in male C57Bl/6J mice that were housed individually or socially (in pairs) directly after weaning, both at standard ambient temperature of 21°C. During adolescence, individually housed mice had reduced growth rate, while energy intake and energy expenditure were increased compared to socially housed counterparts. At 6 weeks of age, these mice had reduced lean body mass, but significantly higher white adipose tissue mass compared to socially housed mice, and higher UCP-1 mRNA expression in brown adipose tissue. During adulthood, body weight gain of individually housed animals exceeded that of socially housed mice, with elevations in both energy intake and expenditure. At 18 weeks of age, individually housed mice showed higher adiposity and higher mRNA expression of UCP-1 in inguinal white but not in brown adipose tissue. Exposure to an obesogenic diet starting at 6 weeks of age further amplified body weight gain and adipose tissue deposition and caused strong suppression of inguinal white adipose tissue mRNA UCP-1 expression. This study shows that post-weaning individual housing of male mice impairs adolescent growth and results in higher susceptibility to obesity in adulthood with putative roles for thermoregulation and/or affectiveness.
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Affiliation(s)
- Lidewij Schipper
- Danone Nutricia Research, Utrecht, The Netherlands
- GELIFES, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
- * E-mail:
| | - Steffen van Heijningen
- GELIFES, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - Giorgio Karapetsas
- GELIFES, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - Eline M. van der Beek
- Danone Nutricia Research, Utrecht, The Netherlands
- Department of Pediatrics, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Gertjan van Dijk
- GELIFES, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
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Luzardo-Ocampo I, Campos-Vega R, Gonzalez de Mejia E, Loarca-Piña G. Consumption of a baked corn and bean snack reduced chronic colitis inflammation in CD-1 mice via downregulation of IL-1 receptor, TLR, and TNF-α associated pathways. Food Res Int 2020; 132:109097. [PMID: 32331643 DOI: 10.1016/j.foodres.2020.109097] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 12/06/2019] [Accepted: 02/10/2020] [Indexed: 12/12/2022]
Abstract
Ulcerative colitis (UC) is a condition that has been rising in the number of cases around the world. Food products made from natural ingredients such as corn and common bean might serve as alternatives for the treatment of UC. This study aimed to assess the anti-inflammatory effect of the consumption of a baked corn and bean snack (CBS) in an in vivo model of UC using 2% dextran sodium sulfate (DSS) as inductor of colitis. CD-1 mice (45, n = 9/group) were randomly separated into 5 groups, treated for 6-weeks as follows: G1 (basal diet, BD), G2 (2% DSS), G3 (20 g CBS/body weight BW/day + BD), G4 (40 g CBS/BW/day + BD) and G5 (60 g CBS/BW/day + BD). BW, Disease Activity Index (DAI), and feces were collected throughout the treatment. After euthanasia, organs (spleen, liver, and colon) were excised and weighed. Feces were analyzed for β-glucuronidase (β-GLUC) activity and gas-chromatography. The colons were analyzed for histopathology, myeloperoxidase (MPO) activity, and gene analysis. At the end of treatments, among the DSS-induced groups, G3 exhibited the lowest BW losses (11.5%), MPO activity (10.4%) and β-GLUC (8.6%). G4 presented the lowest DAI (0.88), relative spleen weight, and histological inflammation score (p < 0.05). Compared to G2, CBS consumption significantly (p < 0.05) reduced serum TNF-α, IL-10, and MCP-1 levels. The fecal metabolome analysis ranked 9-decenoic acid, decane, and butyric acid as the main contributors of pathways associated with the β-oxidation of fatty acids. G4 showed the highest fecal/cecal contents of short-chain fatty acids among all the DSS-induced groups. For the gene expression, G4 was clustered with G1, showing a differential inhibition of the pro-inflammatory genes Il1r1, Il1a, Tlr4, Tlr2, and Tnfrsf1b. In conclusion, CBS consumption decreased the inflammatory state and reduced the expression of the IL-1 receptor, TLR, and TNF-α-associated pathways in DSS-induced UC in CD-1 mice.
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Affiliation(s)
- Ivan Luzardo-Ocampo
- Programa de Posgrado en Alimentos del Centro de la República (PROPAC), Research and Graduate Program in Food Science, School of Chemistry, Universidad Autónoma de Querétaro, 76010 Queretaro, Mexico; Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, 228-230 ERML, 1201 W. Gregory Dr., Urbana, IL 61801, United States.
| | - Rocio Campos-Vega
- Programa de Posgrado en Alimentos del Centro de la República (PROPAC), Research and Graduate Program in Food Science, School of Chemistry, Universidad Autónoma de Querétaro, 76010 Queretaro, Mexico.
| | - Elvira Gonzalez de Mejia
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, 228-230 ERML, 1201 W. Gregory Dr., Urbana, IL 61801, United States.
| | - Guadalupe Loarca-Piña
- Programa de Posgrado en Alimentos del Centro de la República (PROPAC), Research and Graduate Program in Food Science, School of Chemistry, Universidad Autónoma de Querétaro, 76010 Queretaro, Mexico.
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5
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Burhans MS, Hagman DK, Kuzma JN, Schmidt KA, Kratz M. Contribution of Adipose Tissue Inflammation to the Development of Type 2 Diabetes Mellitus. Compr Physiol 2018; 9:1-58. [PMID: 30549014 DOI: 10.1002/cphy.c170040] [Citation(s) in RCA: 158] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The objective of this comprehensive review is to summarize and discuss the available evidence of how adipose tissue inflammation affects insulin sensitivity and glucose tolerance. Low-grade, chronic adipose tissue inflammation is characterized by infiltration of macrophages and other immune cell populations into adipose tissue, and a shift toward more proinflammatory subtypes of leukocytes. The infiltration of proinflammatory cells in adipose tissue is associated with an increased production of key chemokines such as C-C motif chemokine ligand 2, proinflammatory cytokines including tumor necrosis factor α and interleukins 1β and 6 as well as reduced expression of the key insulin-sensitizing adipokine, adiponectin. In both rodent models and humans, adipose tissue inflammation is consistently associated with excess fat mass and insulin resistance. In humans, associations with insulin resistance are stronger and more consistent for inflammation in visceral as opposed to subcutaneous fat. Further, genetic alterations in mouse models of obesity that reduce adipose tissue inflammation are-almost without exception-associated with improved insulin sensitivity. However, a dissociation between adipose tissue inflammation and insulin resistance can be observed in very few rodent models of obesity as well as in humans following bariatric surgery- or low-calorie-diet-induced weight loss, illustrating that the etiology of insulin resistance is multifactorial. Taken together, adipose tissue inflammation is a key factor in the development of insulin resistance and type 2 diabetes in obesity, along with other factors that likely include inflammation and fat accumulation in other metabolically active tissues. © 2019 American Physiological Society. Compr Physiol 9:1-58, 2019.
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Affiliation(s)
- Maggie S Burhans
- Cancer Prevention Program, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA.,Department of Epidemiology, University of Washington, Seattle, Washington, USA
| | - Derek K Hagman
- Cancer Prevention Program, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Jessica N Kuzma
- Cancer Prevention Program, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Kelsey A Schmidt
- Cancer Prevention Program, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA.,Department of Epidemiology, University of Washington, Seattle, Washington, USA
| | - Mario Kratz
- Cancer Prevention Program, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA.,Department of Epidemiology, University of Washington, Seattle, Washington, USA.,Department of Medicine, University of Washington, Seattle, Washington, USA
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6
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Schipper L, Harvey L, van der Beek EM, van Dijk G. Home alone: a systematic review and meta-analysis on the effects of individual housing on body weight, food intake and visceral fat mass in rodents. Obes Rev 2018; 19:614-637. [PMID: 29334694 DOI: 10.1111/obr.12663] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 11/11/2017] [Accepted: 11/21/2017] [Indexed: 12/09/2022]
Abstract
Rats and mice are widely used to study environmental effects on psychological and metabolic health. Study designs differ widely and are often characterized by varying (social) housing conditions. In itself, housing has a profound influence on physiology and behaviour of rodents, affecting energy balance and sustainable metabolic health. However, evidence for potential long-term consequences of individual versus social housing on body weight and metabolic phenotype is inconsistent. We conducted a systematic literature review and meta-analyses assessing effects of individual versus social housing of rats and mice, living under well-accepted laboratory conditions, on measures of metabolic health, including body weight, food intake and visceral adipose tissue mass. Seventy-one studies were included in this review; 59 were included in the meta-analysis. Whilst housing did not affect body weight, both food intake and visceral adipose tissue mass were significantly higher in individually compared with socially housed animals. A combination of emotional stress and lack of social thermoregulation likely contributed to these effects. Increased awareness of consequences and improved specifications of housing conditions are necessary to accurately evaluate efficacy of drugs, diets or other interventions on metabolic and other health outcomes because housing conditions are rarely considered as possible moderators of reported outcomes.
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Affiliation(s)
- L Schipper
- Groningen Institute for Evolutionary Life Sciences (GELIFES), Neurobiology Cluster, Department Behavioural Neurosciences, University of Groningen, Groningen, The Netherlands.,Nutricia Research, Utrecht, The Netherlands
| | | | - E M van der Beek
- Nutricia Research, Utrecht, The Netherlands.,Department of Paediatrics, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands
| | - G van Dijk
- Groningen Institute for Evolutionary Life Sciences (GELIFES), Neurobiology Cluster, Department Behavioural Neurosciences, University of Groningen, Groningen, The Netherlands
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7
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CD-1 mouse fertility rapidly declines and is accompanied with early pregnancy loss under conventional housing conditions. Theriogenology 2018; 108:245-254. [PMID: 29258041 DOI: 10.1016/j.theriogenology.2017.12.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 11/30/2017] [Accepted: 12/07/2017] [Indexed: 10/18/2022]
Abstract
CD-1 mice are commonly employed as a research model for defining mechanisms controlling early mammalian development and for understanding environmental impacts on mammalian fertility. CD-1 female mice were kept four to eight months under conventional animal care housing, and were fed ad libitum with normal laboratory mouse chow. Female weight, mating success, oocyte morphology, blastocyst development in vivo and in vitro, and RT-qPCR analysis of trophectoderm cell markers (Cdx2, Slc2a1, and Atp1a1 transcript abundance, and CDX2 localization) were assessed and contrasted with outcomes from four-week-old control CD-1 mice. Embryo development in vivo in four to eight-month-old mice was significantly reduced compared to four-week-old controls. Oocytes and blastocysts from four to eight-month-old CD-1 mice displayed high levels of fragmentation and degradation, significantly reduced embryo cell counts, decreased Cdx2 transcript abundance, and number of CDX2 positive cells in morulae. We have discovered that female CD-1 mice housed under conventional conditions display a rapid loss of fecundity as they age over a few months. Paradoxically, embryo loss can be avoided by placing early embryos collected from four to eight-month-old mice into culture to support development to the blastocyst stage. We conclude that oocyte quality rapidly declines in CD-1 female mice housed under conventional animal care conditions. Thus, four to eight-month-old female CD-1 mice represent a very distinct research model from that of younger mice and this older research animal model may be preferred for understanding environmental and physiological influences limiting fertility in women.
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8
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Ullah R, Su Y, Shen Y, Li C, Xu X, Zhang J, Huang K, Rauf N, He Y, Cheng J, Qin H, Zhou YD, Fu J. Postnatal feeding with high-fat diet induces obesity and precocious puberty in C57BL/6J mouse pups: a novel model of obesity and puberty. Front Med 2017; 11:266-276. [DOI: 10.1007/s11684-017-0530-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 02/08/2017] [Indexed: 12/15/2022]
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9
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Gao M, Ma Y, Liu D. High-fat diet-induced adiposity, adipose inflammation, hepatic steatosis and hyperinsulinemia in outbred CD-1 mice. PLoS One 2015; 10:e0119784. [PMID: 25768847 PMCID: PMC4358885 DOI: 10.1371/journal.pone.0119784] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Accepted: 01/17/2015] [Indexed: 12/31/2022] Open
Abstract
High-fat diet (HFD) has been applied to a variety of inbred mouse strains to induce obesity and obesity related metabolic complications. In this study, we determined HFD induced development of metabolic disorders on outbred female CD-1 mice in a time dependent manner. Compared to mice on regular chow, HFD-fed CD-1 mice gradually gained more fat mass and consequently exhibited accelerated body weight gain, which was associated with adipocyte hypertrophy and up-regulated expression of adipose inflammatory chemokines and cytokines such as Mcp-1 and Tnf-α. Increased fat accumulation in white adipose tissue subsequently led to ectopic fat deposition in brown adipose tissue, giving rise to whitening of brown adipose tissue without altering plasma level of triglyceride. Ectopic fat deposition was also observed in the liver, which was associated with elevated expression of key genes involved in hepatic lipid sequestration, including Ppar-γ2, Cd36 and Mgat1. Notably, adipose chronic inflammation and ectopic lipid deposition in the liver and brown fat were accompanied by glucose intolerance and insulin resistance, which was correlated with hyperinsulinemia and pancreatic islet hypertrophy. Collectively, these results demonstrate sequentially the events that HFD induces physiological changes leading to metabolic disorders in an outbred mouse model more closely resembling heterogeneity of the human population.
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Affiliation(s)
- Mingming Gao
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia, United States of America
| | - Yongjie Ma
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia, United States of America
| | - Dexi Liu
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, Athens, Georgia, United States of America
- * E-mail:
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10
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Mexican American children have differential elevation of metabolic biomarkers proportional to obesity status. J Pediatr Gastroenterol Nutr 2013; 57:718-21. [PMID: 23945313 DOI: 10.1097/mpg.0b013e3182a6993d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVES There is a health disparity for obesity among Mexican Americans compared with other racial/ethnic groups. In particular, Mexican American children who are obese are likely to become obese adults. The purpose of this study was to examine traditional and nontraditional risk factors in a subset of Mexican American children before their participation in a larger clinical weight loss study. METHODS Venous blood samples were collected from self-identified Mexican American children (12-14 years old) who were assigned to 1 of 3 weight groups based on their standardized body mass index; normal weight (N = 66), overweight (N = 23), or obese (N = 39). Serum was analyzed for interleukin-6, tumor necrosis factor-α, C-peptide, ghrelin, glucagon-like protein, gastric inhibitory polypeptide-1, glucagon, insulin, leptin, macrophage chemoattractant protein 1, and pancreatic polypeptide using a Luminex MagPix-based assay. Total cholesterol, high-density lipoprotein-cholesterol, triglycerides, and glucose were analyzed using enzymatic assays. Data were analyzed for significance using separate analysis of variance tests, with significance set at P < 0.05. RESULTS Relative to normal weight and overweight children, obese children had significantly elevated C-peptide (P < 0.0001), insulin (P < 0.0001), leptin (P < 0.0001), macrophage chemoattractant protein 1 (P = 0.005), and tumor necrosis factor-α (P = 0.006). CONCLUSIONS We observed that Mexican American children as a function of body weight had elevated serum concentrations of several biomarkers that have been linked to chronic disease development in adults. More research is needed to understand how these differences affect disease risk in adulthood.
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Carpenter KC, Strohacker K, McFarlin BK. Considerations to maximize fat mass gain in a mouse model of diet-induced weight gain. Lab Anim 2013; 47:266-73. [DOI: 10.1177/0023677213501658] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Mouse experimental models of diet-induced weight gain are commonly used as analogs to human obesity; however, a wide variety of feeding methods have been used and the most effective way to maximize weight gain is not known. Maximizing weight gain may allow for a reduction in the number of animals required for a given experiment. The purpose of this study was how to cause the greatest amount of weight gain in CD-1 mice by modifying the composition and source of their diet. To accomplish this goal, we completed two experiments: (1) Effect of dietary macronutrient fat intake (60% (HF60), 45% (HF45), 30% (HF30), or 13.5% (CON) fat diet for 18 weeks); and (2) Effect of 1:1 mixed HF60 and CON diets. Outcome measures included food intake, body mass, and body composition, which were measured bi-weekly and statistically analyzed using a repeated measures analysis of variance (RM–ANOVA). In Experiment 1, the greatest increase in body and fat mass was observed in HF60 (36%) and HF45 (29%) compared with HF30 and CON ( P < 0.05). In Experiment 2, HF + stock diet (SK) gained 25% more body mass and 70% more fat mass than HF ( P < 0.05). Collectively, these findings suggest that using a high-fat based diet (>45% calories from fat), mixed with a stock diet, results in substantially more weight gain over a similar period, of time, which would allow an investigator to use ∼40% fewer animals in their experimental model.
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Affiliation(s)
- KC Carpenter
- Minnesota Obesity Prevention Center, University of Minnesota, Minneapolis, USA
| | - K Strohacker
- The Weight Control and Diabetes Center of the Miriam Hospital and The Warren Alpert Medical School of Brown University, Providence, USA
| | - BK McFarlin
- Applied Physiology Laboratory, University of North Texas, Texas, USA
- Department of Biological Sciences, University of North Texas, Texas, USA
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De Araujo GG, Papoti M, De Barros Manchado-Gobatto F, De Mello MAR, Gobatto CA. Monitoring chronic physical stress using biomarkers, performance protocols and mathematical functions to identify physiological adaptations in rats. Lab Anim 2013; 47:36-42. [DOI: 10.1177/0023677212473715] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This study was undertaken to characterize the effects of monotonous training at lactate minimum (LM) intensity on aerobic and anaerobic performances; glycogen concentrations in the soleus muscle, the gastrocnemius muscle and the liver; and creatine kinase (CK), free fatty acids and glucose concentrations in rats. The rats were separated into trained ( n = 10), baseline ( n = 10) and sedentary ( n = 10) groups. The trained group was submitted to the following: 60 min/day, 6 day/week and intensity equivalent to LM during the 12-week training period. The training volume was reduced after four weeks according to a sigmoid function. The total CK (U/L) increased in the trained group after 12 weeks (742.0 ± 158.5) in comparison with the baseline (319.6 ± 40.2) and the sedentary (261.6 ± 42.2) groups. Free fatty acids and glycogen stores (liver, soleus muscle and gastrocnemius muscle) increased after 12 weeks of monotonous training but aerobic and anaerobic performances were unchanged in relation to the sedentary group. The monotonous training at LM increased the level of energy substrates, unchanged aerobic performance, reduced anaerobic capacity and increased the serum CK concentration; however, the rats did not achieve the predicted training volume.
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Affiliation(s)
- Gustavo Gomes De Araujo
- Laboratory of Sports Applied Physiology, Campinas State University (UNICAMP), 13484-350, Limeira, Sao Paulo, Brazil
- Sports Science Research Group, Federal University of Alagoas (UFAL), 57072-970, Maceio, Alagoas, Brazil
| | - Marcelo Papoti
- University of Sao Paulo (USP), 14040-900, Ribeirao Preto, Sao Paulo, Brazil
| | | | | | - Claudio Alexandre Gobatto
- Laboratory of Sports Applied Physiology, Campinas State University (UNICAMP), 13484-350, Limeira, Sao Paulo, Brazil
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Di Pasquale G, Dicembrini I, Raimondi L, Pagano C, Egan JM, Cozzi A, Cinci L, Loreto A, Manni ME, Berretti S, Morelli A, Zheng C, Michael DG, Maggi M, Vettor R, Chiorini JA, Mannucci E, Rotella CM. Sustained exendin-4 secretion through gene therapy targeting salivary glands in two different rodent models of obesity/type 2 diabetes. PLoS One 2012; 7:e40074. [PMID: 22808093 PMCID: PMC3396615 DOI: 10.1371/journal.pone.0040074] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Accepted: 06/05/2012] [Indexed: 11/19/2022] Open
Abstract
Exendin-4 (Ex-4) is a Glucagon-like peptide 1 (GLP-1) receptor agonist approved for the treatment of Type 2 Diabetes (T2DM), which requires daily subcutaneous administration. In T2DM patients, GLP-1 administration is reported to reduce glycaemia and HbA1c in association with a modest, but significant weight loss. The aim of present study was to characterize the site-specific profile and metabolic effects of Ex-4 levels expressed from salivary glands (SG) in vivo, following adeno-associated virus-mediated (AAV) gene therapy in two different animal models of obesity prone to impaired glucose tolerance and T2DM, specifically, Zucker fa/fa rats and high fed diet (HFD) mice. Following percutaneous injection of AAV5 into the salivary glands, biologically active Ex-4 was detected in the blood of both animal models and expression persisted in salivary gland ductal cell until the end of the study. In treated mice, Ex-4 levels averaged 138.9±42.3 pmol/L on week 6 and in treated rats, mean circulating Ex-4 levels were 238.2±72 pmol/L on week 4 and continued to increase through week 8. Expression of Ex-4 resulted in a significant decreased weight gain in both mice and rats, significant improvement in glycemic control and/or insulin sensitivity as well as visceral adipose tissue adipokine profile. In conclusion, these results suggest that sustained site-specific expression of Ex-4 following AAV5-mediated gene therapy is feasible and may be useful in the treatment of obesity as well as trigger improved metabolic profile.
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Affiliation(s)
- Giovanni Di Pasquale
- Molecular Physiology and Therapeutics Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Ilaria Dicembrini
- Section of Endocrinology, Department of Clinical Pathophysiology, University of Florence, Florence, Italy
| | - Laura Raimondi
- Department of Pharmacology, University of Florence, Florence, Italy
| | - Claudio Pagano
- Endocrine-metabolic Laboratory, Department of Medical and Surgical Sciences, University of Padua, Padua, Italy
| | - Josephine M. Egan
- Diabetes Section, National Institute on Aging and Health, Baltimore, Maryland, United States of America
| | - Andrea Cozzi
- Department of Pharmacology, University of Florence, Florence, Italy
| | - Lorenzo Cinci
- Section of Histology, Department of Anatomy, University of Florence, Florence, Italy
| | - Andrea Loreto
- Department of Pharmacology, University of Florence, Florence, Italy
| | - Maria E. Manni
- Department of Pharmacology, University of Florence, Florence, Italy
| | - Silvia Berretti
- Department of Pharmacology, University of Florence, Florence, Italy
| | - Annamaria Morelli
- Sexual Medicine and Andrology Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Changyu Zheng
- Molecular Physiology and Therapeutics Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Drew G. Michael
- Molecular Physiology and Therapeutics Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Mario Maggi
- Sexual Medicine and Andrology Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy
| | - Roberto Vettor
- Endocrine-metabolic Laboratory, Department of Medical and Surgical Sciences, University of Padua, Padua, Italy
| | - John A. Chiorini
- Molecular Physiology and Therapeutics Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
- * E-mail: (JAC); (CMR)
| | | | - Carlo M. Rotella
- Section of Endocrinology, Department of Clinical Pathophysiology, University of Florence, Florence, Italy
- * E-mail: (JAC); (CMR)
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Role of hepatic stellate cells in fibrogenesis in a model of pomegranate-treated fatty liver induced by junk food in male albino rats immunohistochemical and electron microscopic study. ACTA ACUST UNITED AC 2012. [DOI: 10.1097/01.ehx.0000410947.56955.e0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Ghose R, Omoluabi O, Gandhi A, Shah P, Strohacker K, Carpenter KC, McFarlin B, Guo T. Role of high-fat diet in regulation of gene expression of drug metabolizing enzymes and transporters. Life Sci 2011; 89:57-64. [PMID: 21620874 DOI: 10.1016/j.lfs.2011.05.005] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 03/18/2011] [Accepted: 05/03/2011] [Indexed: 02/06/2023]
Abstract
AIM Our aim is to investigate the molecular mechanism of regulation of gene expression of drug metabolizing enzymes (DMEs) and transporters in diet-induced obesity. MAIN METHODS Adult male CD1 mice were fed diets containing 60% kcal fat (HFD) or 10% kcal fat (LFD) for 14 weeks. RNA levels of hepatic DMEs, transporters and their regulatory nuclear receptors (NRs) were analyzed by real-time PCR. Activation of cell-signaling components (JNK and NF-κΒ) and pro-inflammatory cytokines (IL-1β, IL-6 and TNFα) were measured in the liver. Finally, the pharmacodynamics of drugs metabolized by DMEs was measured to determine the clinical relevance of our findings. KEY FINDINGS RNA levels of the hepatic phase I (Cyp3a11, Cyp2b10, Cyp2a4) and phase II (Ugt1a1, Sult1a1, Sultn) enzymes were reduced ~30-60% in HFD compared to LFD mice. RNA levels of Cyp2e1, Cyp1a2 and the drug transporters, multidrug resistance proteins, (Mrp)2, Mrp3 and multidrug resistant gene (Mdr)1b were unaltered in HFD mice. Gene expression of the NRs, PXR and CAR and nuclear protein levels of RXRα was reduced in HFD mice. Cytokines, JNK and NF-κΒ were induced in HFD mice. Thus reduction in hepatic gene expression in obesity may be modulated by cross-talk between NRs and inflammation-induced cell-signaling. Sleep time of Midazolam (Cyp3a substrate) was prolonged in HFD mice, while Zoxazolamine (Cyp1a2 and Cyp2e1 substrate)-induced sleep time was unaltered. SIGNIFICANCE This study demonstrates that gene-specific reductions in DMEs can affect specific drugs metabolized by these enzymes, thus providing a rationale to monitor the effectiveness of drug therapy in obese individuals.
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Affiliation(s)
- Romi Ghose
- Department of Pharmacological and Pharmaceutical Sciences, University of Houston, 1441 Moursund Street, Houston, TX 77030, USA.
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Smeele KM, ter Horst LH, Koeman A, Heikkinen S, Laakso M, Weber NC, Hollmann MW, Zuurbier CJ. The effect of standard chow and reduced hexokinase II on growth, cardiac and skeletal muscle hexokinase and low-flow cardiac ischaemia-reperfusion injury. Lab Anim 2011; 45:160-6. [PMID: 21504994 DOI: 10.1258/la.2011.010096] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In the present study, we examined whether standard chow (SDS versus Purina 5001; both low fat, high carbohydrate) and reductions in hexokinase (HK) II (wild-type versus HKII(+/-) mice) affect (1) growth parameters, (2) HK levels in cardiac and skeletal muscle and (3) low-flow cardiac ischaemia-reperfusion (IR) injury. Total HK activity and HKI and HKII expressions were determined, and low-flow IR injury was examined in isolated hearts subjected to 40 min 5% low-flow ischaemia and 120 min reperfusion. Standard chow, but not HKII reductions, significantly affected body weight, heart weight and cardiac hypertrophy. Both standard chow and reduced HKII diminished total cardiac and skeletal muscle HK activity. For the heart, the Purina chow-induced decrease in total HK activity was through decreases in HKI expression, whereas for skeletal muscle post-translational mechanisms are suggested. Both standard chow and reduced HKII demonstrated a non-significant trend for affecting cardiac IR damage. However, the low-flow ischaemia model was associated with mild sublethal injury only (∼1% cell death). In conclusion, standard chow affects body weight, heart weight and HK activity and HKI expression in the heart, without altering HKII expression. This implicates standard chow as an important factor in genomic, physiological research models and demonstrates that large differences in fat or carbohydrates in the diet are not necessary to affect growth. In a cardiac low-flow IR model, resulting in only mild injury, standard chow or reduced HKII does not significantly affect IR damage.
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Affiliation(s)
- Kirsten M Smeele
- Laboratory of Experimental Intensive Care and Anesthesiology (LEICA), Department of Anesthesiology, Academic Medical Center (AMC), University of Amsterdam, Amsterdam, The Netherlands
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Esposito LM, Simpson RJ, Strohacker K, Carpenter KC, McFarlin BK. Defining a longitudinal survival model to examine forced treadmill running as a countermeasure for diet-induced weight gain. Lab Anim 2010; 44:305-11. [PMID: 20696788 DOI: 10.1258/la.2010.010030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Diet-induced weight gain increases disease risk via disruption of the innate immune system. Flow cytometry is commonly used to assess the immune system; however, in mice such measurements traditionally require terminal procedures and tissue collection to generate sufficient sample. The present study refined an existing flow cytometry method to reduce the number of mice needed to longitudinally measure monocytes. CD-1 male mice were randomly assigned to one of the three groups: DS (diet-induced weight gain + sedentary), DE (diet-induced weight gain + forced treadmill running [total distance 35,755 ± 1832 m]) or NS (normal weight gain + sedentary). DS and DE consumed a 60% fat diet and NS consumed a 10% fat diet ad libitum. Saphenous vein blood samples were collected weekly for a period of six weeks and three-colour flow cytometry was used to measure changes in monocyte (CD11b(+)/14(+)) concentration and cell-surface toll-like receptor 4 (TLR4) expression. DS (18%) and DE (17%) gained more weight than NS (P < 0.001). On a group basis, DS expressed 17% more TLR4 than DE and NS (P = 0.005). The present study demonstrates that a longitudinal survival model can be used to reduce the number of animals needed to complete flow cytometry experiments. Exercise during diet-induced weight prevented some (decreased monocyte TLR4 expression) but not all aspects of innate immune system function.
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Affiliation(s)
- Lisa M Esposito
- National Institute for Athletic Health & Performance, 1210 W 18th Street, Suite 204, Sioux Falls, SD 57104, USA
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