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Sahin C, Melanson JR, Le Billan F, Magomedova L, Ferreira TAM, Oliveira AS, Pollock-Tahari E, Saikali MF, Cash SB, Woo M, Romeiro LAS, Cummins CL. A novel fatty acid mimetic with pan-PPAR partial agonist activity inhibits diet-induced obesity and metabolic dysfunction-associated steatotic liver disease. Mol Metab 2024; 85:101958. [PMID: 38763495 DOI: 10.1016/j.molmet.2024.101958] [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: 01/28/2024] [Revised: 05/09/2024] [Accepted: 05/13/2024] [Indexed: 05/21/2024] Open
Abstract
OBJECTIVE The prevalence of metabolic diseases is increasing globally at an alarming rate; thus, it is essential that effective, accessible, low-cost therapeutics are developed. Peroxisome proliferator-activated receptors (PPARs) are transcription factors that tightly regulate glucose homeostasis and lipid metabolism and are important drug targets for the treatment of type 2 diabetes and dyslipidemia. We previously identified LDT409, a fatty acid-like compound derived from cashew nut shell liquid, as a novel pan-active PPARα/γ/δ compound. Herein, we aimed to assess the efficacy of LDT409 in vivo and investigate the molecular mechanisms governing the actions of the fatty acid mimetic LDT409 in diet-induced obese mice. METHODS C57Bl/6 mice (6-11-month-old) were fed a chow or high fat diet (HFD) for 4 weeks; mice thereafter received once daily intraperitoneal injections of vehicle, 10 mg/kg Rosiglitazone, 40 mg/kg WY14643, or 40 mg/kg LDT409 for 18 days while continuing the HFD. During treatments, body weight, food intake, glucose and insulin tolerance, energy expenditure, and intestinal lipid absorption were measured. On day 18 of treatment, tissues and plasma were collected for histological, molecular, and biochemical analysis. RESULTS We found that treatment with LDT409 was effective at reversing HFD-induced obesity and associated metabolic abnormalities in mice. LDT409 lowered food intake and hyperlipidemia, while improving insulin tolerance. Despite being a substrate of both PPARα and PPARγ, LDT409 was crucial for promoting hepatic fatty acid oxidation and reducing hepatic steatosis in HFD-fed mice. We also highlighted a role for LDT409 in white and brown adipocytes in vitro and in vivo where it decreased fat accumulation, increased lipolysis, induced browning of WAT, and upregulated thermogenic gene Ucp1. Remarkably, LDT409 reversed HFD-induced weight gain back to chow-fed control levels. We determined that the LDT409-induced weight-loss was associated with a combination of increased energy expenditure (detectable before weight loss was apparent), decreased food intake, increased systemic fat utilization, and increased fecal lipid excretion in HFD-fed mice. CONCLUSIONS Collectively, LDT409 represents a fatty acid mimetic that generates a uniquely favorable metabolic response for the treatment of multiple abnormalities including obesity, dyslipidemia, metabolic dysfunction-associated steatotic liver disease, and diabetes. LDT409 is derived from a highly abundant natural product-based starting material and its development could be pursued as a therapeutic solution to the global metabolic health crisis.
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Affiliation(s)
- Cigdem Sahin
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON M5S 3M2, Canada
| | - Jenna-Rose Melanson
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON M5S 3M2, Canada
| | - Florian Le Billan
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON M5S 3M2, Canada
| | - Lilia Magomedova
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON M5S 3M2, Canada
| | - Thais A M Ferreira
- Department of Pharmacy, Faculty of Health Sciences, University of Brasilia, Brasilia, DF 71910-900, Brazil
| | - Andressa S Oliveira
- Department of Pharmacy, Faculty of Health Sciences, University of Brasilia, Brasilia, DF 71910-900, Brazil
| | - Evan Pollock-Tahari
- Toronto General Hospital Research Institute, University Health Network, Toronto, ON, M5G 2C4, Canada
| | - Michael F Saikali
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON M5S 3M2, Canada
| | - Sarah B Cash
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON M5S 3M2, Canada
| | - Minna Woo
- Toronto General Hospital Research Institute, University Health Network, Toronto, ON, M5G 2C4, Canada; Banting and Best Diabetes Centre, Toronto, ON, M5G 2C4, Canada
| | - Luiz A S Romeiro
- Department of Pharmacy, Faculty of Health Sciences, University of Brasilia, Brasilia, DF 71910-900, Brazil
| | - Carolyn L Cummins
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, ON M5S 3M2, Canada; Banting and Best Diabetes Centre, Toronto, ON, M5G 2C4, Canada.
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2
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Ziegler AA, Lawton SBR, Grobe CC, Reho JJ, Freudinger BP, Burnett CML, Nakagawa P, Grobe JL, Segar JL. Early-life sodium deprivation programs long-term changes in ingestive behaviors and energy expenditure in C57BL/6J mice. Am J Physiol Regul Integr Comp Physiol 2023; 325:R576-R592. [PMID: 37720996 PMCID: PMC10866575 DOI: 10.1152/ajpregu.00137.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 09/07/2023] [Accepted: 09/07/2023] [Indexed: 09/19/2023]
Abstract
Postnatal growth failure remains a significant problem for infants born prematurely, despite aggressive efforts to improve perinatal nutrition. Though often dysregulated in early life when children are born preterm, sodium (Na) homeostasis is vital to achieve optimal growth. We hypothesize that insufficient Na supply in this critical period contributes to growth restriction and programmed risks for cardiometabolic disease in later adulthood. Thus, we sought to ascertain the effects of prolonged versus early-life Na depletion on weight gain, body composition, food and water intake behaviors, and energy expenditure in C57BL/6J mice. In one study, mice were provided a low (0.04%)- or normal/high (0.30%)-Na diet between 3 and 18 wk of age. Na-restricted mice demonstrated delayed growth and elevated basal metabolic rate. In a second study, mice were provided 0.04% or 0.30% Na diet between 3 and 6 wk of age and then returned to standard (0.15%)-Na diet through the end of the study. Na-restricted mice exhibited growth delays that quickly caught up on return to standard diet. Between 6 and 18 wk of age, previously restricted mice exhibited sustained, programmed changes in feeding behaviors, reductions in total food intake, and increases in water intake and aerobic energy expenditure while maintaining normal body composition. Although having no effect in control mice, administration of the ganglionic blocker hexamethonium abolished the programmed increase in basal metabolic rate in previously restricted mice. Together these data indicate that early-life Na restriction can cause programmed changes in ingestive behaviors, autonomic function, and energy expenditure that persist well into adulthood.
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Affiliation(s)
- Alisha A Ziegler
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Division of Neonatology, Department of Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Samuel B R Lawton
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Connie C Grobe
- Division of Neonatology, Department of Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - John J Reho
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Bonnie P Freudinger
- Engineering Core, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Colin M L Burnett
- Division of Cardiovascular Medicine, Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Pablo Nakagawa
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
| | - Justin L Grobe
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Department of Biomedical Engineering, Medical College of Wisconsin, Wisconsin, United States
| | - Jeffrey L Segar
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Division of Neonatology, Department of Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
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3
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Herrera-García A, Pérez-Mendoza M, Arellanes-Licea EDC, Gasca-Martínez D, Carmona-Castro A, Díaz-Muñoz M, Miranda-Anaya M. Obesity in male volcano mice Neotomodon alstoni affects the daily rhythm of metabolism and thermoregulation. Front Nutr 2022; 9:963804. [PMID: 35990356 PMCID: PMC9386375 DOI: 10.3389/fnut.2022.963804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 07/13/2022] [Indexed: 11/13/2022] Open
Abstract
The mouse N. alstoni spontaneously develops the condition of obesity in captivity when fed regular chow. We aim to study the differences in metabolic performance and thermoregulation between adult lean and obese male mice. The experimental approach included indirect calorimetry using metabolic cages for VO2 intake and VCO2 production. In contrast, the body temperature was measured and analyzed using intraperitoneal data loggers. It was correlated with the relative presence of UCP1 protein and its gene expression from interscapular adipose tissue (iBAT). We also explored in this tissue the relative presence of Tyrosine Hydroxylase (TH) protein, the rate-limiting enzyme for catecholamine biosynthesis present in iBAT. Results indicate that obese mice show a daily rhythm persists in estimated parameters but with differences in amplitude and profile. Obese mice presented lower body temperature, and a low caloric expenditure, together with lower VO2 intake and VCO2 than lean mice. Also, obese mice present a reduced thermoregulatory response after a cold pulse. Results are correlated with a low relative presence of TH and UCP1 protein. However, qPCR analysis of Ucp1 presents an increase in gene expression in iBAT. Histology showed a reduced amount of brown adipocytes in BAT. The aforementioned indicates that the daily rhythm in aerobic metabolism, thermoregulation, and body temperature control have reduced amplitude in obese mice Neotomodon alstoni.
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Affiliation(s)
- Andrea Herrera-García
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, Mexico.,Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro, Juriquilla, Querétaro, Mexico
| | - Moisés Pérez-Mendoza
- Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro, Juriquilla, Querétaro, Mexico
| | - Elvira Del Carmen Arellanes-Licea
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, Mexico
| | - Deisy Gasca-Martínez
- Instituto de Neurobiología, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, Mexico
| | - Agustín Carmona-Castro
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, Mexico
| | - Mauricio Díaz-Muñoz
- Instituto de Neurobiología, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, Mexico
| | - Manuel Miranda-Anaya
- Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, Mexico
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4
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Oliveira V, Riedl RA, Claflin KE, Mathieu NM, Ritter ML, Balapattabi K, Wackman KK, Reho JJ, Brozoski DT, Morgan DA, Cui H, Rahmouni K, Burnett CML, Nakagawa P, Sigmund CD, Morselli LL, Grobe JL. Melanocortin MC 4R receptor is required for energy expenditure but not blood pressure effects of angiotensin II within the mouse brain. Physiol Genomics 2022; 54:196-205. [PMID: 35476598 PMCID: PMC9131927 DOI: 10.1152/physiolgenomics.00015.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The brain renin-angiotensin system (RAS) is implicated in control of blood pressure (BP), fluid intake, and energy expenditure (EE). Angiotensin II (ANG II) within the arcuate nucleus of the hypothalamus contributes to control of resting metabolic rate (RMR) and thereby EE through its actions on Agouti-related peptide (AgRP) neurons, which also contribute to EE control by leptin. First, we determined that although leptin stimulates EE in control littermates, mice with transgenic activation of the brain RAS (sRA) exhibit increased EE and leptin has no additive effect to exaggerate EE in these mice. These findings led us to hypothesize that leptin and ANG II in the brain stimulate EE through a shared mechanism. Because AgRP signaling to the melanocortin MC4R receptor contributes to the metabolic effects of leptin, we performed a series of studies examining RMR, fluid intake, and BP responses to ANG II in mice rendered deficient for expression of MC4R via a transcriptional block (Mc4r-TB). These mice were resistant to stimulation of RMR in response to activation of the endogenous brain RAS via chronic deoxycorticosterone acetate (DOCA)-salt treatment, whereas fluid and electrolyte effects remained intact. These mice were also resistant to stimulation of RMR via acute intracerebroventricular (ICV) injection of ANG II, whereas BP responses to ICV ANG II remained intact. Collectively, these data demonstrate that the effects of ANG II within the brain to control RMR and EE are dependent on MC4R signaling, whereas fluid homeostasis and BP responses are independent of MC4R signaling.
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Affiliation(s)
- Vanessa Oliveira
- 1Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Ruth A. Riedl
- 2Department of Pediatrics, Baylor College of Medicine, Houston, Texas
| | - Kristin E. Claflin
- 3Department of Neuroscience and Pharmacology, University of Iowa, Iowa City, Iowa
| | - Natalia M. Mathieu
- 1Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - McKenzie L. Ritter
- 1Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | | | - Kelsey K. Wackman
- 1Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - John J. Reho
- 1Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin,4Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Daniel T. Brozoski
- 1Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Donald A. Morgan
- 3Department of Neuroscience and Pharmacology, University of Iowa, Iowa City, Iowa
| | - Huxing Cui
- 3Department of Neuroscience and Pharmacology, University of Iowa, Iowa City, Iowa,5Obesity Research and Education Initiative, University of Iowa, Iowa City, Iowa
| | - Kamal Rahmouni
- 3Department of Neuroscience and Pharmacology, University of Iowa, Iowa City, Iowa,5Obesity Research and Education Initiative, University of Iowa, Iowa City, Iowa,6Department of Internal Medicine, University of Iowa, Iowa City, Iowa,7Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, Iowa,8Iowa City Veterans Affairs Health Care System, Iowa City, Iowa
| | | | - Pablo Nakagawa
- 1Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin,9Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Curt D. Sigmund
- 1Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin,9Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin,10Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Lisa L. Morselli
- 11Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Justin L. Grobe
- 1Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin,4Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, Wisconsin,9Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin,10Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, Wisconsin,12Department of Biomedical Engineering, Medical College of Wisconsin, Milwaukee, Wisconsin
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5
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Patil CN, Ritter ML, Wackman KK, Oliveira V, Balapattabi K, Grobe CC, Brozoski DT, Reho JJ, Nakagawa P, Mouradian GC, Kriegel AJ, Kwitek AE, Hodges MR, Segar JL, Sigmund CD, Grobe JL. Cardiometabolic effects of DOCA-salt in male C57BL/6J mice are variably dependent on sodium and nonsodium components of diet. Am J Physiol Regul Integr Comp Physiol 2022; 322:R467-R485. [PMID: 35348007 PMCID: PMC9054347 DOI: 10.1152/ajpregu.00017.2022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 03/14/2022] [Accepted: 03/23/2022] [Indexed: 01/22/2023]
Abstract
Hypertension characterized by low circulating renin activity accounts for roughly 25%-30% of primary hypertension in humans and can be modeled experimentally via deoxycorticosterone acetate (DOCA)-salt treatment. In this model, phenotypes develop in progressive phases, although the timelines and relative contributions of various mechanisms to phenotype development can be distinct between laboratories. To explore interactions among environmental influences such as diet formulation and dietary sodium (Na) content on phenotype development in the DOCA-salt paradigm, we examined an array of cardiometabolic endpoints in young adult male C57BL/6J mice during sham or DOCA-salt treatments when mice were maintained on several common, commercially available laboratory rodent "chow" diets including PicoLab 5L0D (0.39% Na), Envigo 7913 (0.31% Na), Envigo 2920x (0.15% Na), or a customized version of Envigo 2920x (0.4% Na). Energy balance (weight gain, food intake, digestive efficiency, and energy efficiency), fluid and electrolyte homeostasis (fluid intake, Na intake, fecal Na content, hydration, and fluid compartmentalization), renal functions (urine production rate, glomerular filtration rate, urine Na excretion, renal expression of renin, vasopressin receptors, aquaporin-2 and relationships among markers of vasopressin release, aquaporin-2 shedding, and urine osmolality), and blood pressure, all exhibited changes that were subject to interactions between diet and DOCA-salt. Interestingly, some of these phenotypes, including blood pressure and hydration, were dependent on nonsodium dietary components, as Na-matched diets resulted in distinct phenotype development. These findings provide a broad and robust illustration of an environment × treatment interaction that impacts the use and interpretation of a common rodent model of low-renin hypertension.
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Affiliation(s)
- Chetan N Patil
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - McKenzie L Ritter
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Kelsey K Wackman
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Vanessa Oliveira
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | | | - Connie C Grobe
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Daniel T Brozoski
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - John J Reho
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Pablo Nakagawa
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Gary C Mouradian
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Alison J Kriegel
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cancer Center, Medical College of Wisconsin, Milwaukee, Wisconsin
- Center of Systems Molecular Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Anne E Kwitek
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
- Center of Systems Molecular Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Genomic Sciences and Precision Medicine Center, Medical College of Wisconsin, Milwaukee, Wisconsin
- Biomedical Engineering, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Matthew R Hodges
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Jeffrey L Segar
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Curt D Sigmund
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
- Center of Systems Molecular Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Biomedical Engineering, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Justin L Grobe
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin
- Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, Wisconsin
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, Wisconsin
- Center of Systems Molecular Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin
- Biomedical Engineering, Medical College of Wisconsin, Milwaukee, Wisconsin
- Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, Wisconsin
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6
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Reho JJ, Nakagawa P, Mouradian GC, Grobe CC, Saravia FL, Burnett CML, Kwitek AE, Kirby JR, Segar JL, Hodges MR, Sigmund CD, Grobe JL. Methods for the Comprehensive in vivo Analysis of Energy Flux, Fluid Homeostasis, Blood Pressure, and Ventilatory Function in Rodents. Front Physiol 2022; 13:855054. [PMID: 35283781 PMCID: PMC8914175 DOI: 10.3389/fphys.2022.855054] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 02/03/2022] [Indexed: 01/22/2023] Open
Abstract
Cardiovascular disease represents the leading cause of death in the United States, and metabolic diseases such as obesity represent the primary impediment to improving cardiovascular health. Rodent (mouse and rat) models are widely used to model cardiometabolic disease, and as a result, there is increasing interest in the development of accurate and precise methodologies with sufficiently high resolution to dissect mechanisms controlling cardiometabolic physiology in these small organisms. Further, there is great utility in the development of centralized core facilities furnished with high-throughput equipment configurations and staffed with professional content experts to guide investigators and ensure the rigor and reproducibility of experimental endeavors. Here, we outline the array of specialized equipment and approaches that are employed within the Comprehensive Rodent Metabolic Phenotyping Core (CRMPC) and our collaborating laboratories within the Departments of Physiology, Pediatrics, Microbiology & Immunology, and Biomedical Engineering at the Medical College of Wisconsin (MCW), for the detailed mechanistic dissection of cardiometabolic function in mice and rats. We highlight selected methods for the analysis of body composition and fluid compartmentalization, electrolyte accumulation and flux, energy accumulation and flux, physical activity, ingestive behaviors, ventilatory function, blood pressure, heart rate, autonomic function, and assessment and manipulation of the gut microbiota. Further, we include discussion of the advantages and disadvantages of these approaches for their use with rodent models, and considerations for experimental designs using these methods.
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Affiliation(s)
- John J. Reho
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, United States,Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Pablo Nakagawa
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, United States,Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Gary C. Mouradian
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, United States,Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Connie C. Grobe
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Fatima L. Saravia
- Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Colin M. L. Burnett
- Department of Internal Medicine, University of Iowa Hospitals & Clinics, Iowa City, IA, United States
| | - Anne E. Kwitek
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, United States,Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, United States,Department of Biomedical Engineering, Medical College of Wisconsin, Milwaukee, WI, United States
| | - John R. Kirby
- Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Jeffrey L. Segar
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, United States,Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, United States,Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Matthew R. Hodges
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, United States,Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Curt D. Sigmund
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, United States,Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, United States,Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Justin L. Grobe
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, United States,Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, WI, United States,Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, United States,Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI, United States,Department of Biomedical Engineering, Medical College of Wisconsin, Milwaukee, WI, United States,*Correspondence: Justin L. Grobe,
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7
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Abstract
The intimate association between obesity and type II diabetes urges for a deeper understanding of adipocyte function. We and others have previously delineated a role for the tumor suppressor p53 in adipocyte biology. Here, we show that mice haploinsufficient for MDM2, a key regulator of p53, in their adipose stores suffer from overt obesity, glucose intolerance, and hepatic steatosis. These mice had decreased levels of circulating palmitoleic acid [non-esterified fatty acid (NEFA) 16:1] concomitant with impaired visceral adipose tissue expression of Scd1 and Ffar4. A similar decrease in Scd and Ffar4 expression was found in in vitro differentiated adipocytes with perturbed MDM2 expression. Lowered MDM2 levels led to nuclear exclusion of the transcriptional cofactors, MORC2 and LIPIN1, and thereby possibly hampered adipocyte function by antagonizing LIPIN1-mediated PPARγ coactivation. Collectively, these data argue for a hitherto unknown interplay between MDM2 and MORC2/LIPIN1 involved in balancing adipocyte function.
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8
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Riedl RA, Burnett CML, Pearson NA, Reho JJ, Mokadem M, Edwards RA, Kindel TL, Kirby JR, Grobe JL. Gut Microbiota Represent a Major Thermogenic Biomass. FUNCTION (OXFORD, ENGLAND) 2021; 2:zqab019. [PMID: 33939772 PMCID: PMC8055641 DOI: 10.1093/function/zqab019] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 03/30/2021] [Accepted: 03/31/2021] [Indexed: 01/06/2023]
Abstract
Evidence supports various roles for microbial metabolites in the control of multiple aspects of host energy flux including feeding behaviors, digestive efficiency, and energy expenditure, but few studies have quantified the energy utilization of the biomass of the gut microbiota itself. Because gut microbiota exist in an anoxic environment, energy flux is expected to be anaerobic; unfortunately, commonly utilized O2/CO2 respirometry-based approaches are unable to detect anaerobic energy flux. To quantify the contribution of the gut microbial biomass to whole-animal energy flux, we examined the effect of surgical reduction of gut biomass in C57BL/6J mice via cecectomy and assessed energy expenditure using methods sensitive to anaerobic flux, including bomb and direct calorimetry. First, we determined that cecectomy caused an acceleration of weight gain over several months due to a reduction in combined total host plus microbial energy expenditure, as reflected by an increase in energy efficiency (ie, weight gained per calorie absorbed). Second, we determined that under general anesthesia, cecectomy caused immediate changes in heat dissipation that were significantly modified by short-term pretreatment with dietary or pharmaceutical interventions known to modify the microbiome, and confirmed that these effects were undetectable by respirometry. We conclude that while the cecum only contributes approximately 1% of body mass in the mouse, this organ contributes roughly 8% of total resting energy expenditure, that this contribution is predominantly anaerobic, and that the composition and abundance of the cecal microbial contents can significantly alter its contribution to energy flux.
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Affiliation(s)
- Ruth A Riedl
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Colin M L Burnett
- Department of Internal Medicine, Division of Cardiology, University of Iowa Hospitals & Clinics, Iowa City, IA, USA
| | - Nicole A Pearson
- Department of Laboratory Medicine and Pathology/Proteomics, Mayo Clinic, Rochester, MN, USA
| | - John J Reho
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, USA,Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Mohamad Mokadem
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of Iowa Hospitals & Clinics, Iowa City, IA, USA
| | - Robert A Edwards
- College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
| | - Tammy L Kindel
- Department of Surgery, Medical College of Wisconsin, Milwaukee, WI, USA,Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | - John R Kirby
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, USA,Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, WI, USA,Genomic Sciences and Precision Medicine Center, Medical College of Wisconsin, Milwaukee, WI, USA,Center for Microbiome Research, Medical College of Wisconsin, Milwaukee, WI, USA,Address correspondence to J.L.G. (e-mail: ), J.R.K. (e-mail: )
| | - Justin L Grobe
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, USA,Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, WI, USA,Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, USA,Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI, USA,Address correspondence to J.L.G. (e-mail: ), J.R.K. (e-mail: )
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9
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Seichter F, Vogt J, Tütüncü E, Hagemann LT, Wachter U, Gröger M, Kress S, Radermacher P, Mizaikoff B. Metabolic monitoring via on-line analysis of 13C-enriched carbon dioxide in exhaled mouse breath using substrate-integrated hollow waveguide infrared spectroscopy and luminescence sensing combined with Bayesian sampling. J Breath Res 2021; 15:026013. [PMID: 33630755 DOI: 10.1088/1752-7163/ab8dcd] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In studies that target specific functions or organs, the response is often overlaid by indirect effects of the intervention on global metabolism. The metabolic side of these interactions can be assessed based on total energy expenditure (TEE) and the contributions of the principal energy sources, carbohydrates, proteins and fat to whole body CO2 production. These parameters can be identified from indirect calorimetry using respiratory oxygen intake and CO2 dioxide production data that are combined with the response of the 13CO2 release in the expired air and the glucose tracer enrichment in plasma following a 13C glucose stable isotope infusion. This concept is applied to a mouse protocol involving anesthesia, mechanical respiration, a disease model, like hemorrhage and therapeutic intervention. It faces challenges caused by a small sample size for both breath and plasma as well as changes in metabolic parameters caused by disease and intervention. Key parameters are derived from multiple measurements, all afflicted with errors that may accumulate leading to unrealistic values. To cope with these challenges, a sensitive on-line breath analysis system based on substrate-integrated hollow waveguide infrared spectroscopy and luminescence (iHWG-IR-LS) was used to monitor gas exchange values. A Bayesian statistical model is developed that uses established equations for indirect calorimetry to predict values for respiratory gas exchange and tracer data that are consistent with the corresponding measurements and also provides statistical error bands for these parameters. With this new methodology, it was possible to estimate important metabolic parameters (respiratory quotient (RQ), relative contribution of carbohydrate, protein and fat oxidation fcarb, ffat and fprot , total energy expenditure TEE) in a resolution never available before for a minimal invasive protocol of mice under anesthesia.
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Affiliation(s)
- Felicia Seichter
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
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10
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Hua H, Zhang Y, Zhao F, Chen K, Wu T, Liu Q, Huang S, Zhang A, Jia Z. Celastrol inhibits intestinal lipid absorption by reprofiling the gut microbiota to attenuate high-fat diet-induced obesity. iScience 2021; 24:102077. [PMID: 33598642 PMCID: PMC7868996 DOI: 10.1016/j.isci.2021.102077] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/22/2020] [Accepted: 01/14/2021] [Indexed: 12/18/2022] Open
Abstract
Celastrol, a compound extracted from traditional Chinese medicine, has been reported as a potent anti-obesity agent with controversial mechanisms. Here both C57BL/6J and leptin-deficient (ob/ob) mice fed a high-fat diet (HFD) displayed body weight loss after celastrol therapy, opposing the previous viewpoint that celastrol improves obesity by sensitizing leptin signaling. More importantly, celastrol downregulated lipid transporters in the intestine, increased lipid excretion in feces, and reduced body weight gain in HFD mice. Meanwhile, analysis of gut microbiota revealed that celastrol altered the gut microbiota composition in HFD-fed mice, and modulating gut microbiota by antibiotics or fecal microbiota transplantation blocked the celastrol effect on intestinal lipid transport and body weight gain, suggesting a critical role of the gut microbiota composition in mediating the anti-obesity role of celastrol under HFD. Together, the findings revealed that celastrol reduces intestinal lipid absorption to antagonize obesity by resetting the gut microbiota profile under HFD feeding. Celastrol reduced intestinal lipid transporters and lipids absorption Celastrol reset gut microbiota profile to modulate intestinal lipid transport Celastrol attenuated obesity in leptin-deficient (ob/ob) mice fed high fat diet
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Affiliation(s)
- Hu Hua
- Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China.,Department of Nephrology, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, P. R. of China
| | - Yue Zhang
- Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China.,Department of Nephrology, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, P. R. of China
| | - Fei Zhao
- Department of Nephrology, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China
| | - Ke Chen
- Department of Endocrinology, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, China.,Department of Child Health Care, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, China
| | - Tong Wu
- Department of Endocrinology, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, China.,Department of Child Health Care, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, China
| | - Qianqi Liu
- Department of Endocrinology, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, China.,Department of Child Health Care, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, China
| | - Songming Huang
- Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China.,Department of Nephrology, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, P. R. of China
| | - Aihua Zhang
- Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China.,Department of Nephrology, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, P. R. of China
| | - Zhanjun Jia
- Nanjing Key Laboratory of Pediatrics, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China.,Department of Nephrology, Children's Hospital of Nanjing Medical University, Guangzhou Road #72, Nanjing 210008, P. R. of China.,Jiangsu Key Laboratory of Pediatrics, Nanjing Medical University, Nanjing 210029, P. R. of China
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11
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Ye Y, Abu El Haija M, Morgan DA, Guo D, Song Y, Frank A, Tian L, Riedl RA, Burnett CML, Gao Z, Zhu Z, Shahi SK, Zarei K, Couvelard A, Poté N, Ribeiro-Parenti L, Bado A, Noureddine L, Bellizzi A, Kievit P, Mangalam AK, Zingman LV, Le Gall M, Grobe JL, Kaplan LM, Clegg D, Rahmouni K, Mokadem M. Endocannabinoid Receptor-1 and Sympathetic Nervous System Mediate the Beneficial Metabolic Effects of Gastric Bypass. Cell Rep 2020; 33:108270. [PMID: 33113371 PMCID: PMC7660289 DOI: 10.1016/j.celrep.2020.108270] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 05/18/2020] [Accepted: 09/23/2020] [Indexed: 12/27/2022] Open
Abstract
The exact mechanisms underlying the metabolic effects of bariatric surgery remain unclear. Here, we demonstrate, using a combination of direct and indirect calorimetry, an increase in total resting metabolic rate (RMR) and specifically anaerobic RMR after Roux-en-Y gastric bypass (RYGB), but not sleeve gastrectomy (SG). We also show an RYGB-specific increase in splanchnic sympathetic nerve activity and "browning" of visceral mesenteric fat. Consequently, selective splanchnic denervation abolishes all beneficial metabolic outcomes of gastric bypass that involve changes in the endocannabinoid signaling within the small intestine. Furthermore, we demonstrate that administration of rimonabant, an endocannabinoid receptor-1 (CB1) inverse agonist, to obese mice mimics RYGB-specific effects on energy balance and splanchnic nerve activity. On the other hand, arachidonoylethanolamide (AEA), a CB1 agonist, attenuates the weight loss and metabolic signature of this procedure. These findings identify CB1 as a key player in energy regulation post-RYGB via a pathway involving the sympathetic nervous system.
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Affiliation(s)
- Yuanchao Ye
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Marwa Abu El Haija
- Department of Pediatrics, Division of Gastroenterology, Hepatology, and Nutrition, Stanford University School of Medicine, Palo Alto, CA 94304, USA
| | - Donald A Morgan
- Department of Neuroscience and Pharmacology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Deng Guo
- Department of Neuroscience and Pharmacology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Yang Song
- College of Pharmacy, China Medical University, 77 Puhe Rd., Liaoning 110122, P.R. China
| | - Aaron Frank
- The Biomedical Research Department, Diabetes and Obesity Research Division, Cedars Sinai Medical Center, Beverly Hills, CA 90048, USA
| | - Liping Tian
- Department of Clinical Pharmacy, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu 211198, P.R. China
| | - Ruth A Riedl
- Department of Neuroscience and Pharmacology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Colin M L Burnett
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA; Department of Neuroscience and Pharmacology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Zhan Gao
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Zhiyong Zhu
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Shailesh K Shahi
- Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Kasra Zarei
- Medical Scientist Training Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Anne Couvelard
- INSERM U1149, Centre de Recherche sur l'Inflammation, Université de Paris, Paris 75018, France; Department of Pathology, Bichat Hospital, AP-HP, Paris 75018, France
| | - Nicolas Poté
- INSERM U1149, Centre de Recherche sur l'Inflammation, Université de Paris, Paris 75018, France; Department of Pathology, Bichat Hospital, AP-HP, Paris 75018, France
| | - Lara Ribeiro-Parenti
- INSERM U1149, Centre de Recherche sur l'Inflammation, Université de Paris, Paris 75018, France; Department of General and Digestive Surgery, Bichat Hospital, AP-HP, Paris 75018, France
| | - André Bado
- INSERM U1149, Centre de Recherche sur l'Inflammation, Université de Paris, Paris 75018, France
| | - Lama Noureddine
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Andrew Bellizzi
- Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Paul Kievit
- Division of Diabetes, Obesity and Metabolism, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR 97006, USA
| | - Ashutosh K Mangalam
- Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA; Interdisciplinary Graduate Program in Immunology and Molecular Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Leonid V Zingman
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA; Fraternal Orders of Eagles Diabetes Research Center, Iowa City, IA 52242, USA; Veterans Affairs Health Care System, Iowa City, IA 52242, USA; Obesity Research & Education Initiative, University of Iowa, Iowa City, IA 52242, USA
| | - Maude Le Gall
- INSERM U1149, Centre de Recherche sur l'Inflammation, Université de Paris, Paris 75018, France
| | - Justin L Grobe
- Departments of Physiology and Biomedical Engineering, Medical College of Wisconsin, Milwaukee, MI 53226, USA
| | - Lee M Kaplan
- Department of Medicine, Harvard Medical School, Boston, MA 02115, USA; Obesity, Metabolism, and Nutrition Institute, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Deborah Clegg
- College of Nursing and Health Professions, Drexel University, 1601 Cherry Street, Philadelphia, PA 19102, USA
| | - Kamal Rahmouni
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA; Department of Neuroscience and Pharmacology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA; Medical Scientist Training Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA; Fraternal Orders of Eagles Diabetes Research Center, Iowa City, IA 52242, USA; Veterans Affairs Health Care System, Iowa City, IA 52242, USA; Obesity Research & Education Initiative, University of Iowa, Iowa City, IA 52242, USA
| | - Mohamad Mokadem
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA; Department of Neuroscience and Pharmacology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA; Fraternal Orders of Eagles Diabetes Research Center, Iowa City, IA 52242, USA; Veterans Affairs Health Care System, Iowa City, IA 52242, USA; Obesity Research & Education Initiative, University of Iowa, Iowa City, IA 52242, USA.
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12
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Ono-Moore KD, Rutkowsky JM, Pearson NA, Williams DK, Grobe JL, Tolentino T, Lloyd KCK, Adams SH. Coupling of energy intake and energy expenditure across a temperature spectrum: impact of diet-induced obesity in mice. Am J Physiol Endocrinol Metab 2020; 319:E472-E484. [PMID: 32691631 PMCID: PMC7509245 DOI: 10.1152/ajpendo.00041.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Obesity and its metabolic sequelae are implicated in dysfunction of the somatosensory, sympathetic, and hypothalamic systems. Because these systems contribute to integrative regulation of energy expenditure (EE) and energy intake (EI) in response to ambient temperature (Ta) changes, we hypothesized that diet-induced obesity (DIO) disrupts Ta-associated EE-EI coupling. C57BL/6N male mice were fed a high-fat diet (HFD; 45% kcal) or low-fat diet (LFD; 10% kcal) for ∼9.5 wk; HFD mice were then split into body weight (BWT) quartiles (n = 8 each) to study DIO-low gainers (Q1) versus -high gainers (Q4). EI and indirect calorimetry (IC) were measured over 3 days each at 10°C, 20°C, and 30°C. Responses did not differ between LFD, Q1, and Q4; EI and BWT-adjusted EE increased rapidly when transitioning toward 20°C and 10°C. In all groups, EI at 30°C was not reduced despite lower EE, resulting in positive energy balance and respiratory exchange ratios consistent with increased de novo lipogenesis, energy storage, and relative hyperphagia. We conclude that 1) systems controlling Ta-dependent acute EI/EE coupling remained intact in obese mice and 2) rapid coupling of EI/EE at cooler temperatures is an important adaptation to maintain energy stores and defend body temperature, but less critical at thermoneutrality. A post hoc analysis using digestible EI plus IC-calculated EE suggests that standard IC assumptions for EE calculation require further validation in the setting of DIO. The experimental paradigm provides a platform to query the hypothalamic, somatosensory, and sympathetic mechanisms that drive Ta-associated EI/EE coupling.
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Affiliation(s)
| | - Jennifer M Rutkowsky
- Department of Molecular Biosciences, UC Davis School of Veterinary Medicine, University of California, Davis, California
- Mouse Metabolic Phenotyping Center, University of California, Davis, California
| | - Nicole A Pearson
- Department of Pharmacology, University of Iowa, Carver College of Medicine, Iowa City, Iowa
| | - D Keith Williams
- Arkansas Children's Nutrition Center, Little Rock, Arkansas
- Department of Biostatistics, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Justin L Grobe
- Department of Physiology and Biomedical Engineering, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Todd Tolentino
- Mouse Metabolic Phenotyping Center, University of California, Davis, California
| | - K C Kent Lloyd
- Mouse Metabolic Phenotyping Center, University of California, Davis, California
- Department of Surgery, School of Medicine, University of California, Davis, California
| | - Sean H Adams
- Arkansas Children's Nutrition Center, Little Rock, Arkansas
- Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas
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13
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Yang J, Guo Y, Henning SM, Chan B, Long J, Zhong J, Acin-Perez R, Petcherski A, Shirihai O, Heber D, Li Z. Ellagic Acid and Its Microbial Metabolite Urolithin A Alleviate Diet-Induced Insulin Resistance in Mice. Mol Nutr Food Res 2020; 64:e2000091. [PMID: 32783299 DOI: 10.1002/mnfr.202000091] [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: 01/30/2020] [Revised: 07/27/2020] [Indexed: 12/15/2022]
Abstract
SCOPE This work aims at evaluating the effect of dietary ellagic acid (EA) and its microbial metabolite urolithin A (UA) on glucose metabolism and insulin resistance (IR) in mice with diet-induced IR. METHODS AND RESULTS DBA2J mice are fed a high fat/high sucrose diet (HF/HS) for 8 weeks to induce IR and then 0.1% EA, UA, or EA and UA (EA+UA) are added to the HF/HS-diet for another 8 weeks. UA significantly decreases fasting glucose and increases adiponectin compared with HF/HS-controls. During intraperitoneal insulin tolerance test, EA+UA significantly improve insulin-mediated glucose lowering effects at 15 and 120 min and reduce blood triglycerides compared with HF/HS-controls. Serum free fatty acids are significantly decreased by EA, UA, and EA+UA. Differential expression of genes related to mitochondrial function by EA, UA, and EA+UA in liver and skeletal muscle is observed. Primary hepatocytes from IR-mice have higher proton leak, basal and ATP-linked oxygen consumption rates compared with healthy controls. EA and EA+UA but not UA reduce the proton leak in hepatocytes from IR-mice. CONCLUSION EA and UA induce different metabolic benefits in IR mice. The effects of EA and UA on mitochondrial function suggest a potentially novel mechanism modulating metabolism.
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Affiliation(s)
- Jieping Yang
- Center for Human Nutrition, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - Yuanqiang Guo
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin, 300350, China
| | - Susanne M Henning
- Center for Human Nutrition, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - Brenda Chan
- Center for Human Nutrition, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - Jianfeng Long
- Department of Clinical Nutrition, 2nd XiangYa Hospital, Central South University, Changsha, 410011, China
| | - Jin Zhong
- Department of Pathology and Laboratory Medicine, VA Greater Los Angeles Health Care System, Los Angeles, CA, 90095, USA
| | - Rebeca Acin-Perez
- Division of Endocrinology, Department of Medicine, and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - Anton Petcherski
- Division of Endocrinology, Department of Medicine, and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - Orian Shirihai
- Division of Endocrinology, Department of Medicine, and Department of Molecular and Medical Pharmacology, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - David Heber
- Center for Human Nutrition, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA
| | - Zhaoping Li
- Center for Human Nutrition, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA.,Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, CA, 90095, USA
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14
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Mast MH. Claims of anomalously long fasting: An assessment of the evidence from investigated cases. Explore (NY) 2020; 16:287-296. [PMID: 32739103 DOI: 10.1016/j.explore.2020.05.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 05/16/2020] [Accepted: 05/24/2020] [Indexed: 10/24/2022]
Abstract
BACKGROUND Throughout history and to the present day, there have been reports of people claiming inedia, i.e., an anomalous long-term abstinence from food or from food and fluid. Some were isolated and monitored and their abstinences confirmed. This raises the question of whether there may be an anomaly with wide implications that science has overlooked. On the other hand, there have been cases of exposed fraud. The reports on the studies are scattered and it can be difficult to judge their rigor and the strength and implications of their evidence. A critical evaluation seems useful. OBJECTIVES The objectives were to obtain an overview of investigated cases of claimed inedia, to assess the anomaly of the claims and study results, to assess the quality of the studies, and to identify deception methods to inform future safeguards. METHOD I developed criteria for differentiating normal from anomalous nutrition and fasting and for assessing the quality of inedia studies. Studies found through a systematic search were then assessed and the features of cases of fraud extracted. RESULTS 47 eligible investigations of 38 claimants were found. Out of the 38 cases, results were assessed as (seemingly) anomalous in 11, with nine cases of monitored food and fluid deprivation ranging from 14 to 68 days (median 28 days), and two cases of food deprivation for 365 and 411 days. In 17 cases, anomaly was assessed as not confirmed due to issues with study design or reporting. Fraud was established in 10 cases. Deception methods were creative. Post-1900 studies were also assessed for quality. Quality was not considered adequate in any. CONCLUSIONS I consider the evidential status of inedia unconfirmed as no assessed study had both anomalous findings and impeccable quality. However, quality was often downgraded due to reporting issues and it cannot be concluded in reverse that all claimants with anomalous results were able to deceive the investigators. The results of many studies are curious and demand further research. The conducted analysis provides guidance for improving rigor and transparency in future studies.
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15
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Maciak S, Sawicka D, Sadowska A, Prokopiuk S, Buczyńska S, Bartoszewicz M, Niklińska G, Konarzewski M, Car H. Low basal metabolic rate as a risk factor for development of insulin resistance and type 2 diabetes. BMJ Open Diabetes Res Care 2020; 8:8/1/e001381. [PMID: 32690630 PMCID: PMC7373309 DOI: 10.1136/bmjdrc-2020-001381] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 06/01/2020] [Accepted: 06/08/2020] [Indexed: 12/13/2022] Open
Abstract
INTRODUCTION Identification of physiological factors influencing susceptibility to insulin resistance and type 2 diabetes (T2D) remains an important challenge for biology and medicine. Numerous studies reported energy expenditures as one of those components directly linked to T2D, with noticeable increase of basal metabolic rate (BMR) associated with the progression of insulin resistance. Conversely, the putative link between genetic, rather than phenotypic, determination of BMR and predisposition to development of T2D remains little studied. In particular, low BMR may constitute a considerable risk factor predisposing to development of T2D. RESEARCH DESIGN AND METHODS We analyzed the development of insulin resistance and T2D in 20-week-old male laboratory mice originating from three independent genetic line types. Two of those lines were subjected to divergent, non-replicated selection towards high or low body mass-corrected BMR. The third line type was non-selected and consisted of randomly bred animals serving as an outgroup (reference) to the selected line types. To induce insulin resistance, mice were fed for 8 weeks with a high fat diet; the T2D was induced by injection with a single dose of streptozotocin and further promotion with high fat diet. As markers for insulin resistance and T2D advancement, we followed the changes in body mass, fasting blood glucose, insulin level, lipid profile and mTOR expression. RESULTS We found BMR-associated differentiation in standard diabetic indexes between studied metabolic lines. In particular, mice with low BMR were characterized by faster body mass gain, blood glucose gain and deterioration in lipid profile. In contrast, high BMR mice were characterized by markedly higher expression of the mTOR, which may be associated with much slower development of T2D. CONCLUSIONS Our study suggests that genetically determined low BMR makeup involves metabolism-specific pathways increasing the risk of development of insulin resistance and T2D.
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Affiliation(s)
| | - Diana Sawicka
- Faculty of Health Sciences, Medical University of Bialystok, Bialystok, Poland
| | - Anna Sadowska
- Faculty of Health Sciences, Medical University of Bialystok, Bialystok, Poland
| | - Sławomir Prokopiuk
- Faculty of Health Sciences, Medical University of Bialystok, Bialystok, Poland
- Faculty of Health Sciences, Lomza State University of Applied Sciences, Lomza, Poland
| | | | | | - Gabriela Niklińska
- Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Warsaw, Poland
| | | | - Halina Car
- Faculty of Health Sciences, Medical University of Bialystok, Bialystok, Poland
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16
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Soto JE, Burnett CM, Eyck PT, Abel ED, Grobe JL. Comparison of the Effects of High-Fat Diet on Energy Flux in Mice Using Two Multiplexed Metabolic Phenotyping Systems. Obesity (Silver Spring) 2019; 27:793-802. [PMID: 30938081 PMCID: PMC6478533 DOI: 10.1002/oby.22441] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 01/18/2019] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Multiplexed metabolic phenotyping systems are available from multiple commercial vendors, and each system includes unique design features. Although expert opinion supports strengths and weaknesses of each design, empirical data from carefully controlled studies to test the biological impact of design differences are lacking. METHODS Wild-type C57BL/6J mice of both sexes underwent phenotyping in OxyMax (Columbus Instruments International) and Promethion (Sable Systems International) systems located within the same room of a newly constructed animal research facility in a crossover design study. Phenotypes were examined under chow (2920×)-fed conditions and again after 4 weeks of 60% high-fat diet (D12492) feeding. RESULTS Food intake, physical activity, and respiratory gas exchange data significantly diverged between systems, depending upon sex of animals and diet supplied. Estimates of energy expenditure based on gas exchange in both systems accounted for a fraction of consumed calories that was greater in males than females. CONCLUSIONS Design differences quantitatively impact the assessment of metabolic end points and thus the qualitative interpretation of various interventions. Importantly, current multiplexed systems remain blind to multiple additional end points, including digestive efficiency and selected forms of energy flux (nitrogenous, anaerobic, etc.), that account for a physiologically and/or pathophysiologically significant fraction of total energy flux.
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Affiliation(s)
- Jamie E. Soto
- Department of Internal Medicine, University of Iowa, Iowa City, IA 52242
- Department of Fraternal Order of Eagles’ Diabetes Research Center, University of Iowa, Iowa City, IA 52242
| | - Colin M.L. Burnett
- Department of Internal Medicine, University of Iowa, Iowa City, IA 52242
- Department of Pharmacology, University of Iowa, Iowa City, IA 52242
| | - Patrick Ten Eyck
- Department of Institute for Clinical and Translational Science, University of Iowa, Iowa City, IA 52242
| | - E. Dale Abel
- Department of Internal Medicine, University of Iowa, Iowa City, IA 52242
- Department of Fraternal Order of Eagles’ Diabetes Research Center, University of Iowa, Iowa City, IA 52242
- Department of Obesity Research & Education Initiative, University of Iowa, Iowa City, IA 52242
- Department of Abboud Cardiovascular Research Center, University of Iowa, Iowa City, IA 52242
| | - Justin L. Grobe
- Department of Pharmacology, University of Iowa, Iowa City, IA 52242
- Department of Fraternal Order of Eagles’ Diabetes Research Center, University of Iowa, Iowa City, IA 52242
- Department of Obesity Research & Education Initiative, University of Iowa, Iowa City, IA 52242
- Department of UIHC Center for Hypertension Research, University of Iowa, Iowa City, IA 52242
- Department of Abboud Cardiovascular Research Center, University of Iowa, Iowa City, IA 52242
- Iowa Neuroscience Institute, University of Iowa, Iowa City, IA 52242
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Abstract
PURPOSE OF REVIEW The influence of gut bacteria upon host physiology is increasingly recognized, but mechanistic links are lacking. Diseases of energetic imbalance such as obesity and diabetes represent major risk factors for cardiovascular diseases such as hypertension. Thus, here, we review current mechanistic contributions of the gut microbiota to host energetics. RECENT FINDINGS Gut bacteria generate a multitude of small molecules which can signal to host tissues within and beyond the gastrointestinal tract to influence host physiology, and gut bacteria can also influence host digestive efficiency by altering the bioavailability of polysaccharides, yet the quantitative energetic effects of these processes remain unclear. Recently, our team has demonstrated that gut bacteria constitute a major anaerobic thermogenic biomass, which can quantitatively account for obesity. Quantitative understanding of the mechanisms by which gut bacteria influence energy homeostasis may ultimately inform the relationship between gut bacteria and cardiovascular dysfunction.
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Empirical Examinations of Effects of Three-Level Green Exercise on Engagement with Nature and Physical Activity. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:ijerph15020375. [PMID: 29470447 PMCID: PMC5858444 DOI: 10.3390/ijerph15020375] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 01/28/2018] [Accepted: 02/07/2018] [Indexed: 12/04/2022]
Abstract
Green exercise can be classified into three levels based on engagement with nature. Although this classification was proposed more than a decade ago, few studies have investigated it since. The present study examined the effects of green exercise levels on engagement with nature and physical activity (PA) through a field experiment. A questionnaire was distributed to 95 students from a technology university in Central Taiwan to measure their level of engagement with nature in people-environment transactions, while their PA was measured using three instruments. In addition, because social interaction may distract individual attention from activities or their environments, the present study incorporated the presence of partners as a control variable. The results revealed that (1) engagement with nature and PA significantly differed between the levels of green exercise, and the higher the level of green exercise participated in, the greater the level of engagement with nature; and (2) although the presence of partners did not influence the level of engagement with nature, it significantly affected the level of PA.
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19
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Effects of postnatal overfeeding and fish oil diet on energy expenditure in rats. Pediatr Res 2018; 83:156-163. [PMID: 28846671 DOI: 10.1038/pr.2017.207] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 08/08/2017] [Indexed: 12/17/2022]
Abstract
BackgroudEarly life nutrition may have a role in the regulation of metabolism in adulthood. The present study aimed to evaluate the effects of postnatal overfeeding and a postweaning fish oil diet on energy expenditure.MethodsOn postnatal day 3, rat litters were adjusted to a litter size of three (small litters, SLs) or ten (normal litters, NLs). After weaning, SLs were fed the standard diet or a fish oil diet enriched with polyunsaturated fatty acids (SL-FOs) for 10 weeks. The metabolic parameters of rats were monitored using the TSE LabMaster at postnatal week 3 (W3) and postnatal week 13 (W13).ResultsAt W3, the O2 consumption and heat production in SLs were lower than those in NLs, while the respiratory exchange ratio (RER) was higher than NLs. SLs showed obesity, dyslipidemia, and impaired glucose tolerance at W13. The postweaning fish oil diet in SLs not only increased O2 consumption, CO2 production, heat production, and reduced the RER but it also reduced weight gain, serum triglycerides, and improved glucose tolerance at W13.ConclusionPostnatal overfeeding can decrease the level of body energy expenditure and induce obesity, but a fish oil diet can increase the energy expenditure and prevent the development of metabolic dysregulation in adults.
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Pitynski-Miller D, Ross M, Schmill M, Schambow R, Fuller T, Flynn FW, Skinner DC. A high salt diet inhibits obesity and delays puberty in the female rat. Int J Obes (Lond) 2017; 41:1685-1692. [PMID: 28674441 PMCID: PMC5675756 DOI: 10.1038/ijo.2017.154] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 04/30/2017] [Accepted: 06/22/2017] [Indexed: 12/18/2022]
Abstract
BACKGROUND/OBJECTIVES Processed foods are considered major contributors to the worldwide obesity epidemic. In addition to high sugar and fat contents, processed foods contain large amounts of salt. Owing to the correlations with rising adiposity, salt has recently been proposed to be obesogenic. This study investigated three hypotheses: (i) high salt contributes to weight gain and adiposity in juvenile female rats, (ii) puberty onset would be altered because salt is known to affect neuronal systems involved in activating the reproductive system, and (iii) enhanced adiposity will act synergistically with salt to drive early puberty onset. DESIGN Female weanling rats (post-natal day 21, n=105) were fed a low fat/low salt diet, low fat/high salt diet, high fat/low salt diet or a high salt/high fat diet for 24 days. Metabolic measures, including weight gain, food intake, fecal output, activity and temperature were recorded in subsets of animals. RESULTS Body weight, retroperitoneal and perirenal fat pad weight, and adipocyte size were all lower in animals fed high fat/high salt compared with animals fed high fat alone. Leptin levels were reduced in high fat/high salt fed animals compared with high fat/low salt-fed animals. Daily calorie intake was higher initially but declined with adjusted food intake and was not different among groups after 5 days. Osmolality and corticosterone were not different among groups. Fecal analysis showed excess fat excretion and a decreased digestive efficiency in animals fed high fat/low salt but not in animals fed high fat/high salt. Although respiratory exchange ratio was reduced by high dietary fat or salt, aerobic-resting metabolic rate was not affected by the diet. High salt delayed puberty onset, regardless of dietary fat content. CONCLUSIONS Salt delays puberty and prevents the obesogenic effect of a high fat diet. The reduced weight gain evident in high salt-fed animals is not due to differences in food intake or digestive efficiency.
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Affiliation(s)
- Dori Pitynski-Miller
- Neuroscience Program, 1000 E University Ave, University of Wyoming, Laramie, WY 82071
| | - Micah Ross
- Department of Zoology & Physiology, 1000 E University Ave, University of Wyoming, Laramie, WY 82071
| | - Margaret Schmill
- Department of Zoology & Physiology, 1000 E University Ave, University of Wyoming, Laramie, WY 82071
| | - Rachel Schambow
- Department of Zoology & Physiology, 1000 E University Ave, University of Wyoming, Laramie, WY 82071
| | - Teresa Fuller
- Department of Zoology & Physiology, 1000 E University Ave, University of Wyoming, Laramie, WY 82071
| | - Francis W. Flynn
- Neuroscience Program, 1000 E University Ave, University of Wyoming, Laramie, WY 82071
- Department of Zoology & Physiology, 1000 E University Ave, University of Wyoming, Laramie, WY 82071
| | - Donal C. Skinner
- Neuroscience Program, 1000 E University Ave, University of Wyoming, Laramie, WY 82071
- Department of Zoology & Physiology, 1000 E University Ave, University of Wyoming, Laramie, WY 82071
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21
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Claflin KE, Sandgren JA, Lambertz AM, Weidemann BJ, Littlejohn NK, Burnett CML, Pearson NA, Morgan DA, Gibson-Corley KN, Rahmouni K, Grobe JL. Angiotensin AT1A receptors on leptin receptor-expressing cells control resting metabolism. J Clin Invest 2017; 127:1414-1424. [PMID: 28263184 DOI: 10.1172/jci88641] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 01/12/2017] [Indexed: 12/13/2022] Open
Abstract
Leptin contributes to the control of resting metabolic rate (RMR) and blood pressure (BP) through its actions in the arcuate nucleus (ARC). The renin-angiotensin system (RAS) and angiotensin AT1 receptors within the brain are also involved in the control of RMR and BP, but whether this regulation overlaps with leptin's actions is unclear. Here, we have demonstrated the selective requirement of the AT1A receptor in leptin-mediated control of RMR. We observed that AT1A receptors colocalized with leptin receptors (LEPRs) in the ARC. Cellular coexpression of AT1A and LEPR was almost exclusive to the ARC and occurred primarily within neurons expressing agouti-related peptide (AgRP). Mice lacking the AT1A receptor specifically in LEPR-expressing cells failed to show an increase in RMR in response to a high-fat diet and deoxycorticosterone acetate-salt (DOCA-salt) treatments, but BP control remained intact. Accordingly, loss of RMR control was recapitulated in mice lacking AT1A in AgRP-expressing cells. We conclude that angiotensin activates divergent mechanisms to control BP and RMR and that the brain RAS functions as a major integrator for RMR control through its actions at leptin-sensitive AgRP cells of the ARC.
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22
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Abstract
Increasing evidence supports a major role for the renin-angiotensin system (RAS) in energy balance physiology. The RAS exists as a circulating system but also as a local paracrine/autocrine signaling mechanism in target tissues including the gastrointestinal tract, the brain, the kidney, and distinct adipose beds. Through activation of various receptors in these target tissues, the RAS contributes to the control of food intake behavior, digestive efficiency, spontaneous physical activity, and aerobic and anaerobic resting metabolism. Although the assortment of methodologies available to assess the various aspects of energy balance can be daunting for an investigator new to this area, a relatively straightforward array of entry-level and advanced methodologies can be employed to comprehensively and quantitatively dissect the effects of experimental manipulations on energy homeostasis. Such methodologies and a simple initial workflow for the use of these methods are described in this chapter, including the use of metabolic caging systems, bomb calorimetry, body composition analyzers, respirometry systems, and direct calorimetry systems. Finally, a brief discussion of the statistical analyses of metabolic data is included.
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Affiliation(s)
- Justin L Grobe
- Department of Pharmacology, Center for Hypertension Research, The Obesity Research and Education Initiative, François M. Abboud Cardiovascular Research Center, The Fraternal Order of Eagles' Diabetes Research Center, University of Iowa, 51 Newton Rd., 2-307 BSB, Iowa City, IA, 52242, USA.
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23
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Risperidone-induced weight gain is mediated through shifts in the gut microbiome and suppression of energy expenditure. EBioMedicine 2016; 2:1725-34. [PMID: 26870798 PMCID: PMC4740326 DOI: 10.1016/j.ebiom.2015.10.018] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 10/06/2015] [Accepted: 10/16/2015] [Indexed: 01/05/2023] Open
Abstract
Risperidone is a second-generation antipsychotic that causes weight gain. We hypothesized that risperidone-induced shifts in the gut microbiome are mechanistically involved in its metabolic consequences. Wild-type female C57BL/6J mice treated with risperidone (80 μg/day) exhibited significant excess weight gain, due to reduced energy expenditure, which correlated with an altered gut microbiome. Fecal transplant from risperidone-treated mice caused a 16% reduction in total resting metabolic rate in naïve recipients, attributable to suppression of non-aerobic metabolism. Risperidone inhibited growth of cultured fecal bacteria grown anaerobically more than those grown aerobically. Finally, transplant of the fecal phage fraction from risperidone-treated mice was sufficient to cause excess weight gain in naïve recipients, again through reduced energy expenditure. Collectively, these data highlight a major role for the gut microbiome in weight gain following chronic use of risperidone, and specifically implicates the modulation of non-aerobic resting metabolism in this mechanism.
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24
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Boi SK, Buchta CM, Pearson NA, Francis MB, Meyerholz DK, Grobe JL, Norian LA. Obesity alters immune and metabolic profiles: New insight from obese-resistant mice on high-fat diet. Obesity (Silver Spring) 2016; 24:2140-9. [PMID: 27515998 PMCID: PMC5039085 DOI: 10.1002/oby.21620] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 06/17/2016] [Accepted: 07/05/2016] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Diet-induced obesity has been shown to alter immune function in mice, but distinguishing the effects of obesity from changes in diet composition is complicated. It was hypothesized that immunological differences would exist between diet-induced obese (DIO) and obese-resistant (OB-Res) mice fed the same high-fat diet (HFD). METHODS BALB/c mice were fed either standard chow or HFD to generate lean or DIO and OB-Res mice, respectively. Resulting mice were analyzed for serum immunologic and metabolic profiles and cellular immune parameters. RESULTS BALB/c mice on HFD were categorized as DIO or OB-Res, based on body weight versus lean controls. DIO mice were physiologically distinct from OB-Res mice, whose serum insulin, leptin, gastric inhibitory polypeptide, and eotaxin concentrations remained similar to lean controls. DIO mice had increased macrophage(+) crown-like structures in white adipose tissue, although macrophage percentages were unchanged from OB-Res and lean mice. DIO mice also had decreased splenic CD4(+) T cells, elevated serum GM-CSF, and increased splenic CD11c(+) dendritic cells, but impaired dendritic cell stimulatory capacity (P < 0.05 vs. lean controls). These parameters were unaltered in OB-Res mice versus lean controls. CONCLUSIONS Diet-induced obesity results in alterations in immune and metabolic profiles that are distinct from effects caused by HFD alone.
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Affiliation(s)
- Shannon K Boi
- Graduate Biomedical Sciences, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Claire M Buchta
- Department of Urology, The University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Nicole A Pearson
- Department of Pharmacology, The Obesity Research and Education Initiative, and the Fraternal Order of Eagles' Diabetes Research Center, The University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Meghan B Francis
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - David K Meyerholz
- Department of Pathology, The University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Justin L Grobe
- Department of Pharmacology, The Obesity Research and Education Initiative, and the Fraternal Order of Eagles' Diabetes Research Center, The University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Lyse A Norian
- Graduate Biomedical Sciences, University of Alabama at Birmingham, Birmingham, Alabama, USA.
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, Alabama, USA.
- Nutrition Obesity Research Center and Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, USA.
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Liisberg U, Myrmel LS, Fjære E, Rønnevik AK, Bjelland S, Fauske KR, Holm JB, Basse AL, Hansen JB, Liaset B, Kristiansen K, Madsen L. The protein source determines the potential of high protein diets to attenuate obesity development in C57BL/6J mice. Adipocyte 2016; 5:196-211. [PMID: 27386160 DOI: 10.1080/21623945.2015.1122855] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 10/28/2015] [Accepted: 11/12/2015] [Indexed: 10/22/2022] Open
Abstract
The notion that the obesogenic potential of high fat diets in rodents is attenuated when the protein:carbohydrate ratio is increased is largely based on studies using casein or whey as the protein source. We fed C57BL/6J mice high fat-high protein diets using casein, soy, cod, beef, chicken or pork as protein sources. Casein stood out as the most efficient in preventing weight gain and accretion of adipose mass. By contrast, mice fed diets based on pork or chicken, and to a lesser extent mice fed cod or beef protein, had increased adipose tissue mass gain relative to casein fed mice. Decreasing the protein:carbohydrate ratio in diets with casein or pork as protein sources led to accentuated fat mass accumulation. Pork fed mice were more obese than casein fed mice, and relative to casein, the pork-based feed induced substantial accumulation of fat in classic interscapular brown adipose tissue accompanied by decreased UCP1 expression. Furthermore, intake of a low fat diet with casein, but not pork, as a protein source reversed diet-induced obesity. Compared to pork, casein seems unique in maintaining the classical brown morphology in interscapular brown adipose tissue with high UCP1 expression. This was accompanied by increased expression of genes involved in a futile cycling of fatty acids. Our results demonstrate that intake of high protein diets based on other protein sources may not have similar effects, and hence, the obesity protective effect of high protein diets is clearly modulated by protein source.
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Affiliation(s)
- Ulrike Liisberg
- National Institute of Nutrition and Seafood Research, Bergen, Norway
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Lene Secher Myrmel
- National Institute of Nutrition and Seafood Research, Bergen, Norway
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Even Fjære
- National Institute of Nutrition and Seafood Research, Bergen, Norway
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Alexander K. Rønnevik
- National Institute of Nutrition and Seafood Research, Bergen, Norway
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Susanne Bjelland
- National Institute of Nutrition and Seafood Research, Bergen, Norway
| | | | - Jacob Bak Holm
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | | | - Jacob B. Hansen
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Bjørn Liaset
- National Institute of Nutrition and Seafood Research, Bergen, Norway
| | | | - Lise Madsen
- National Institute of Nutrition and Seafood Research, Bergen, Norway
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
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26
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Hallenborg P, Fjære E, Liaset B, Petersen RK, Murano I, Sonne SB, Falkerslev M, Winther S, Jensen BAH, Ma T, Hansen JB, Cinti S, Blagoev B, Madsen L, Kristiansen K. p53 regulates expression of uncoupling protein 1 through binding and repression of PPARγ coactivator-1α. Am J Physiol Endocrinol Metab 2016; 310:E116-28. [PMID: 26578713 DOI: 10.1152/ajpendo.00119.2015] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 11/15/2015] [Indexed: 12/25/2022]
Abstract
The tumor suppressor p53 (TRP53 in mice) is known for its involvement in carcinogenesis, but work during recent years has underscored the importance of p53 in the regulation of whole body metabolism. A general notion is that p53 is necessary for efficient oxidative metabolism. The importance of UCP1-dependent uncoupled respiration and increased oxidation of glucose and fatty acids in brown or brown-like adipocytes, termed brite or beige, in relation to energy balance and homeostasis has been highlighted recently. UCP1-dependent uncoupled respiration in classic interscapular brown adipose tissue is central to cold-induced thermogenesis, whereas brite/beige adipocytes are of special importance in relation to diet-induced thermogenesis, where the importance of UCP1 is only clearly manifested in mice kept at thermoneutrality. We challenged wild-type and TRP53-deficient mice by high-fat feeding under thermoneutral conditions. Interestingly, mice lacking TRP53 gained less weight compared with their wild-type counterparts. This was related to an increased expression of Ucp1 and other PPARGC1a and PPARGC1b target genes but not Ppargc1a or Ppargc1b in inguinal white adipose tissue of mice lacking TRP53. We show that TRP53, independently of its ability to bind DNA, inhibits the activity of PPARGC1a and PPARGC1b. Collectively, our data show that TRP53 has the ability to regulate the thermogenic capacity of adipocytes through modulation of PPARGC1 activity.
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Affiliation(s)
- Philip Hallenborg
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark; Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Even Fjære
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark; National Institute of Nutrition and Seafood Research, Bergen, Norway; and
| | - Bjørn Liaset
- National Institute of Nutrition and Seafood Research, Bergen, Norway; and
| | - Rasmus Koefoed Petersen
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Incoronata Murano
- Department of Experimental and Clinical Medicine, Center of Obesity Università Politecnica della Marche, Ancona, Italy
| | - Si Brask Sonne
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Mathias Falkerslev
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Sally Winther
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | | | - Tao Ma
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Jacob B Hansen
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Saverio Cinti
- Department of Experimental and Clinical Medicine, Center of Obesity Università Politecnica della Marche, Ancona, Italy
| | - Blagoy Blagoev
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Lise Madsen
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark; National Institute of Nutrition and Seafood Research, Bergen, Norway; and
| | - Karsten Kristiansen
- Laboratory of Genomics and Molecular Biomedicine, Department of Biology, University of Copenhagen, Copenhagen, Denmark;
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27
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Padovani R, Lehnert T, Cettour-Rose P, Doenlen R, Auwerx J, Gijs MAM. Miniaturized implantable sensors for in vivo localized temperature measurements in mice during cold exposure. Biomed Microdevices 2015; 18:1. [DOI: 10.1007/s10544-015-0028-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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28
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Littlejohn NK, Grobe JL. Opposing tissue-specific roles of angiotensin in the pathogenesis of obesity, and implications for obesity-related hypertension. Am J Physiol Regul Integr Comp Physiol 2015; 309:R1463-73. [PMID: 26491099 DOI: 10.1152/ajpregu.00224.2015] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 10/15/2015] [Indexed: 12/24/2022]
Abstract
Metabolic disease, specifically obesity, has now become the greatest challenge to improving cardiovascular health. The renin-angiotensin system (RAS) exists as both a circulating hormone system and as a local paracrine signaling mechanism within various tissues including the brain, kidney, and adipose, and this system is strongly implicated in cardiovascular health and disease. Growing evidence also implicates the RAS in the control of energy balance, supporting the concept that the RAS may be mechanistically involved in the pathogenesis of obesity and obesity hypertension. Here, we review the involvement of the RAS in the entire spectrum of whole organism energy balance mechanisms, including behaviors (food ingestion and spontaneous physical activity) and biological processes (digestive efficiency and both aerobic and nonaerobic resting metabolic rates). We hypothesize that opposing, tissue-specific effects of the RAS to modulate these various components of energy balance can explain the apparently paradoxical results reported by energy-balance studies that involve stimulating, versus disrupting, the RAS. We propose a model in which such opposing and tissue-specific effects of the RAS can explain the failure of simple, global RAS blockade to result in weight loss in humans, and hypothesize that obesity-mediated uncoupling of endogenous metabolic rate control mechanisms can explain the phenomenon of obesity-related hypertension.
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Affiliation(s)
- Nicole K Littlejohn
- Department of Pharmacology, the Obesity Research and Education Initiative, the Fraternal Order of Eagles' Diabetes Research Center, the François M. Abboud Cardiovascular Research Center, and the Center for Hypertension Research, University of Iowa, Iowa City, Iowa
| | - Justin L Grobe
- Department of Pharmacology, the Obesity Research and Education Initiative, the Fraternal Order of Eagles' Diabetes Research Center, the François M. Abboud Cardiovascular Research Center, and the Center for Hypertension Research, University of Iowa, Iowa City, Iowa
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29
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Meyer CW, Reitmeir P, Tschöp MH. Exploration of Energy Metabolism in the Mouse Using Indirect Calorimetry: Measurement of Daily Energy Expenditure (DEE) and Basal Metabolic Rate (BMR). ACTA ACUST UNITED AC 2015; 5:205-222. [PMID: 26331756 DOI: 10.1002/9780470942390.mo140216] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Current comprehensive mouse metabolic phenotyping involves studying energy balance in cohorts of mice via indirect calorimetry, which determines heat release from changes in respiratory air composition. Here, we describe the measurement of daily energy expenditure (DEE) and basal metabolic rate (BMR) in mice. These well-defined metabolic descriptors serve as meaningful first-line read-outs for metabolic phenotyping and should be reported when exploring energy expenditure in mice. For further guidance, the issue of appropriate sample sizes and the frequency of sampling of metabolic measurements is also discussed.
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Affiliation(s)
- Carola W Meyer
- Institute for Diabetes and Obesity, Helmholtz-Zentrum München GmbH, Neuherberg, Germany
| | - Peter Reitmeir
- Institute for Health Economics and Health Care Management, Helmholtz-Zentrum München GmbH, Neuherberg, Germany
| | - Matthias H Tschöp
- Institute for Diabetes and Obesity, Helmholtz-Zentrum München GmbH, Neuherberg, Germany.,Division of Metabolic Diseases, Department of Medicine, Technische Universität München, Munich, Germany
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30
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Weidemann BJ, Voong S, Morales-Santiago FI, Kahn MZ, Ni J, Littlejohn NK, Claflin KE, Burnett CML, Pearson NA, Lutter ML, Grobe JL. Dietary Sodium Suppresses Digestive Efficiency via the Renin-Angiotensin System. Sci Rep 2015; 5:11123. [PMID: 26068176 PMCID: PMC4464075 DOI: 10.1038/srep11123] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Accepted: 05/18/2015] [Indexed: 12/22/2022] Open
Abstract
Dietary fats and sodium are both palatable and are hypothesized to synergistically contribute to ingestive behavior and thereby obesity. Contrary to this hypothesis, C57BL/6J mice fed a 45% high fat diet exhibited weight gain that was inhibited by increased dietary sodium content. This suppressive effect of dietary sodium upon weight gain was mediated specifically through a reduction in digestive efficiency, with no effects on food intake behavior, physical activity, or resting metabolism. Replacement of circulating angiotensin II levels reversed the effects of high dietary sodium to suppress digestive efficiency. While the AT1 receptor antagonist losartan had no effect in mice fed low sodium, the AT2 receptor antagonist PD-123,319 suppressed digestive efficiency. Correspondingly, genetic deletion of the AT2 receptor in FVB/NCrl mice resulted in suppressed digestive efficiency even on a standard chow diet. Together these data underscore the importance of digestive efficiency in the pathogenesis of obesity, and implicate dietary sodium, the renin-angiotensin system, and the AT2 receptor in the control of digestive efficiency regardless of mouse strain or macronutrient composition of the diet. These findings highlight the need for greater understanding of nutrient absorption control physiology, and prompt more uniform assessment of digestive efficiency in animal studies of energy balance.
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Affiliation(s)
| | - Susan Voong
- Departments of Pharmacology, University of Iowa, Iowa City, IA
| | | | - Michael Z Kahn
- Departments of Psychiatry, University of Iowa, Iowa City, IA
| | - Jonathan Ni
- Departments of Pharmacology, University of Iowa, Iowa City, IA
| | | | | | | | | | - Michael L Lutter
- 1] Departments of Psychiatry, University of Iowa, Iowa City, IA. [2] The Fraternal Order of Eagles' Diabetes Research Center, University of Iowa, Iowa City, IA. [3] The Obesity Research and Education Initiative, University of Iowa, Iowa City, IA
| | - Justin L Grobe
- 1] Departments of Pharmacology, University of Iowa, Iowa City, IA. [2] The Fraternal Order of Eagles' Diabetes Research Center, University of Iowa, Iowa City, IA. [3] The Obesity Research and Education Initiative, University of Iowa, Iowa City, IA. [4] The Center for Hypertension Research, University of Iowa, Iowa City, IA
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31
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Abreu-Vieira G, Xiao C, Gavrilova O, Reitman ML. Integration of body temperature into the analysis of energy expenditure in the mouse. Mol Metab 2015; 4:461-70. [PMID: 26042200 PMCID: PMC4443293 DOI: 10.1016/j.molmet.2015.03.001] [Citation(s) in RCA: 148] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 02/26/2015] [Accepted: 03/03/2015] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES We quantified the effect of environmental temperature on mouse energy homeostasis and body temperature. METHODS The effect of environmental temperature (4-33 °C) on body temperature, energy expenditure, physical activity, and food intake in various mice (chow diet, high-fat diet, Brs3 (-/y) , lipodystrophic) was measured using continuous monitoring. RESULTS Body temperature depended most on circadian phase and physical activity, but also on environmental temperature. The amounts of energy expenditure due to basal metabolic rate (calculated via a novel method), thermic effect of food, physical activity, and cold-induced thermogenesis were determined as a function of environmental temperature. The measured resting defended body temperature matched that calculated from the energy expenditure using Fourier's law of heat conduction. Mice defended a higher body temperature during physical activity. The cost of the warmer body temperature during the active phase is 4-16% of total daily energy expenditure. Parameters measured in diet-induced obese and Brs3 (-/y) mice were similar to controls. The high post-mortem heat conductance demonstrates that most insulation in mice is via physiological mechanisms. CONCLUSIONS At 22 °C, cold-induced thermogenesis is ∼120% of basal metabolic rate. The higher body temperature during physical activity is due to a higher set point, not simply increased heat generation during exercise. Most insulation in mice is via physiological mechanisms, with little from fur or fat. Our analysis suggests that the definition of the upper limit of the thermoneutral zone should be re-considered. Measuring body temperature informs interpretation of energy expenditure data and improves the predictiveness and utility of the mouse to model human energy homeostasis.
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Key Words
- BMR, basal metabolic rate
- Basal metabolic rate
- Body temperature
- CIT, cold-induced thermogenesis
- Cold-induced thermogenesis
- EE, energy expenditure
- Energy expenditure
- HFD, high-fat diet
- Heat conductance
- LCT, lower critical temperature
- PAEE, physical activity energy expenditure
- RQ, respiratory quotient
- TEE, total energy expenditure
- TEF, thermic effect of food
- Ta, environmental temperature
- Tb, core body temperature
- Thermoneutrality
- dTb, defended body temperature
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Affiliation(s)
- Gustavo Abreu-Vieira
- Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD 20892, USA
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, 106 91 Stockholm, Sweden
| | - Cuiying Xiao
- Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD 20892, USA
| | - Oksana Gavrilova
- Mouse Metabolism Core, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD 20892, USA
| | - Marc L. Reitman
- Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD 20892, USA
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Zhang Y, Fischer KE, Soto V, Liu Y, Sosnowska D, Richardson A, Salmon AB. Obesity-induced oxidative stress, accelerated functional decline with age and increased mortality in mice. Arch Biochem Biophys 2015; 576:39-48. [PMID: 25558793 DOI: 10.1016/j.abb.2014.12.018] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 12/05/2014] [Accepted: 12/20/2014] [Indexed: 12/22/2022]
Abstract
Obesity is a serious chronic disease that increases the risk of numerous co-morbidities including metabolic syndrome, cardiovascular disease and cancer as well as increases risk of mortality, leading some to suggest this condition represents accelerated aging. Obesity is associated with significant increases in oxidative stress in vivo and, despite the well-explored relationship between oxidative stress and aging, the role this plays in the increased mortality of obese subjects remains an unanswered question. Here, we addressed this by undertaking a comprehensive, longitudinal study of a group of high fat-fed obese mice and assessed both their changes in oxidative stress and in their performance in physiological assays known to decline with aging. In female C57BL/6J mice fed a high-fat diet starting in adulthood, mortality was significantly increased as was oxidative damage in vivo. High fat-feeding significantly accelerated the decline in performance in several assays, including activity, gait, and rotarod. However, we also found that obesity had little effect on other markers of function and actually improved performance in grip strength, a marker of muscular function. Together, this first comprehensive assessment of longitudinal, functional changes in high fat-fed mice suggests that obesity may induce segmental acceleration of some of the aging process.
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Affiliation(s)
- Yiqiang Zhang
- The Sam and Ann Barshop Institute for Longevity and Aging Studies, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA; Department of Physiology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Kathleen E Fischer
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Vanessa Soto
- The Sam and Ann Barshop Institute for Longevity and Aging Studies, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Yuhong Liu
- The Sam and Ann Barshop Institute for Longevity and Aging Studies, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Danuta Sosnowska
- Reynolds Oklahoma Center on Aging, University of Oklahoma Health Sciences Center and Oklahoma City VA Medical Center, Oklahoma, OK, USA
| | - Arlan Richardson
- Reynolds Oklahoma Center on Aging, University of Oklahoma Health Sciences Center and Oklahoma City VA Medical Center, Oklahoma, OK, USA
| | - Adam B Salmon
- The Sam and Ann Barshop Institute for Longevity and Aging Studies, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA; Department of Molecular Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA; Geriatric Research, Education and Clinical Center, South Texas Veterans Health Care System, San Antonio, TX, USA.
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Ye Y, Sun Z, Guo A, Song LS, Grobe JL, Chen S. Ablation of the GNB3 gene in mice does not affect body weight, metabolism or blood pressure, but causes bradycardia. Cell Signal 2014; 26:2514-20. [PMID: 25093805 DOI: 10.1016/j.cellsig.2014.07.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Revised: 06/26/2014] [Accepted: 07/28/2014] [Indexed: 11/18/2022]
Abstract
G protein β3 (Gβ3) is an isoform of heterotrimeric G protein β subunits involved in transducing G protein coupled receptor (GPCR) signaling. Polymorphisms in Gβ3 (GNB3) are associated with many human disorders (e.g. hypertension, diabetes and obesity) but the role of GNB3 in these pathogeneses remains unclear. Here, Gβ3-null mice (GNB3(-/-)) were characterized to determine how Gβ3 functions to regulate blood pressure, body weight and metabolism. We found Gβ3 expression restricted to limited types of tissues, including the retina, several regions of the brain and heart ventricles. Gβ3-deficient mice were normal as judged by body weight gain by age or by feeding with high-fat diet (HFD); glucose tolerance and insulin sensitivity; baseline blood pressure and angiotensin II infusion-induced hypertension. During tail-cuff blood pressure measurements, however, Gβ3-null mice had slower heart rates (~450 vs ~500 beats/min). This bradycardia was not observed in isolated and perfused Gβ3-null mouse hearts. Moreover, mouse hearts isolated from GNB3(-/-) and controls responded equivalently to muscarinic receptor- and β-adrenergic receptor-stimulated bradycardia and tachycardia, respectively. Since no difference was seen in isolated hearts, Gβ3 is unlikely to be involved directly in the GPCR signaling activity that controls heart pacemaker activity. These results demonstrate that although Gβ3 appears dispensable in mice for the regulation of blood pressure, body weight and metabolic features associated with obesity and diabetes, Gβ3 may regulate heart rate.
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Affiliation(s)
- Yuanchao Ye
- Department of Pharmacology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | - Zhizeng Sun
- Department of Pharmacology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | - Ang Guo
- Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | - Long-Sheng Song
- Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | - Justin L Grobe
- Department of Pharmacology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | - Songhai Chen
- Department of Pharmacology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.
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Should we abandon indirect calorimetry as a tool to diagnose energy expenditure? Not yet. Perhaps not ever. Commentary on Burnett and Grobe (2014). Mol Metab 2014; 3:342-4. [PMID: 24944891 PMCID: PMC4060216 DOI: 10.1016/j.molmet.2014.04.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 04/09/2014] [Indexed: 11/30/2022] Open
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