1
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Geßner A, Hartmann M, Trentzsch K, Stölzer-Hutsch H, Schriefer D, Ziemssen T. The Association of Age, Sex, and BMI on Lower Limb Neuromuscular and Muscle Mechanical Function in People with Multiple Sclerosis. Biomedicines 2024; 12:971. [PMID: 38790932 PMCID: PMC11117965 DOI: 10.3390/biomedicines12050971] [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: 02/28/2024] [Revised: 04/22/2024] [Accepted: 04/25/2024] [Indexed: 05/26/2024] Open
Abstract
(1) Background: The countermovement jump (CMJ) on a force plate could be a sensitive assessment for detecting early lower-limb muscle mechanical deficits in the early stages of multiple sclerosis (MS). CMJ performance is known to be influenced by various anthropometric, physiological, and biomechanical factors, mostly investigated in children and adult athletes. Our aim was to investigate the association of age, sex, and BMI with muscle mechanical function using CMJ to provide a comprehensive overview of lower-limb motor function in people with multiple sclerosis (pwMS). (2) Methods: A cross-sectional study was conducted with pwMS (N = 164) and healthy controls (N = 98). All participants performed three maximal CMJs on a force plate. Age, sex, and BMI were collected from all participants. (3) Results: Significant age, sex, and BMI effects were found for all performance parameters, flight time, and negative and positive power for pwMS and HC, but no significant interaction effects with the group (pwMS, HC) were detected. The highest significant effects were found for sex on flight time (η2 = 0.23), jump height (η2 = 0.23), and positive power (η2 = 0.13). PwMS showed significantly lower CMJ performance compared to HC in middle-aged (31-49 years), with normal weight to overweight and in both women and men. (4) Conclusions: This study showed that age, sex, and BMI are associated with muscle mechanical function in pwMS and HC. These results may be useful in developing reference values for CMJ. This is a crucial step in integrating CMJ into the diagnostic assessment of people with early MS and developing individualized and effective neurorehabilitative therapy.
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Affiliation(s)
| | | | | | | | | | - Tjalf Ziemssen
- Center of Clinical Neuroscience, Neurological Clinic, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstr. 74, 01307 Dresden, Germany; (A.G.); (M.H.); (K.T.); (H.S.-H.); (D.S.)
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2
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Feng D, Liu T, Zhang X, Xiang T, Su W, Quan W, Jiang R. Fingolimod improves diffuse brain injury by promoting AQP4 polarization and functional recovery of the glymphatic system. CNS Neurosci Ther 2024; 30:e14669. [PMID: 38459666 PMCID: PMC10924110 DOI: 10.1111/cns.14669] [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: 10/23/2023] [Revised: 01/26/2024] [Accepted: 02/17/2024] [Indexed: 03/10/2024] Open
Abstract
BACKGROUND Diffuse brain injury (DBI) models are characterized by intense global brain inflammation and edema, which characterize the most severe form of TBI. In a previous experiment, we found that fingolimod promoted recovery after controlled cortical impact injury (CCI) by modulating inflammation around brain lesions. However, it remains unclear whether fingolimod can also attenuate DBI because of its different injury mechanisms. Furthermore, whether fingolimod has additional underlying effects on repairing DBI is unknown. METHODS The impact acceleration model of DBI was established in adult Sprague-Dawley rats. Fingolimod (0.5 mg/kg) was administered 0.5, 24, and 48 h after injury for 3 consecutive days. Immunohistochemistry, immunofluorescence analysis, cytokine array, and western blotting were used to evaluate inflammatory cells, inflammatory factors, AQP4 polarization, apoptosis in brain cells, and the accumulation of APP after DBI in rats. To evaluate the function of the glymphatic system (GS), a fluorescent tracer was injected into the cistern. The neural function of rats with DBI was evaluated using various tests, including the modified neurological severity score (mNSS), horizontal ladder-crossing test, beam walking test, and tape sensing and removal test. Brain water content was also measured. RESULTS Fingolimod administration for 3 consecutive days could reduce the levels of inflammatory cytokines, neutrophil recruitment, microglia, and astrocyte activation in the brain following DBI. Moreover, fingolimod reduced apoptotic protein expression, brain cell apoptosis, brain edema, and APP accumulation. Additionally, fingolimod inhibited the loss of AQP4 polarization, improved lymphatic system function, and reduced damage to nervous system function. Notably, inhibiting the GS weakened the therapeutic effect of fingolimod on the neurological function of rats with DBI and increased the accumulation of APP in the brain. CONCLUSIONS In brief, these findings suggest that fingolimod alleviates whole-brain inflammation and GS system damage after DBI and that inhibiting the GS could weaken the positive effect of fingolimod on nerve function in rats with DBI. Thus, inhibiting inflammation and regulating the GS may be critical for the therapeutic effect of fingolimod on DBI.
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Affiliation(s)
- Dongyi Feng
- Department of NeurosurgeryTianjin Medical University General HospitalTianjinChina
- Tianjin Neurological Institute, Key Laboratory of Post Neuro‐injury Neuro‐repair and Regeneration in Central Nervous System, State Key Laboratory of Experimental HematologyMinistry of EducationTianjinChina
| | - Tao Liu
- Department of NeurosurgeryTianjin Medical University General HospitalTianjinChina
- Tianjin Neurological Institute, Key Laboratory of Post Neuro‐injury Neuro‐repair and Regeneration in Central Nervous System, State Key Laboratory of Experimental HematologyMinistry of EducationTianjinChina
| | - Xinjie Zhang
- Department of NeurosurgeryTianjin Medical University General HospitalTianjinChina
- Tianjin Neurological Institute, Key Laboratory of Post Neuro‐injury Neuro‐repair and Regeneration in Central Nervous System, State Key Laboratory of Experimental HematologyMinistry of EducationTianjinChina
| | - Tangtang Xiang
- Department of NeurosurgeryTianjin Medical University General HospitalTianjinChina
- Tianjin Neurological Institute, Key Laboratory of Post Neuro‐injury Neuro‐repair and Regeneration in Central Nervous System, State Key Laboratory of Experimental HematologyMinistry of EducationTianjinChina
| | - Wanqiang Su
- Department of NeurosurgeryTianjin Medical University General HospitalTianjinChina
- Tianjin Neurological Institute, Key Laboratory of Post Neuro‐injury Neuro‐repair and Regeneration in Central Nervous System, State Key Laboratory of Experimental HematologyMinistry of EducationTianjinChina
| | - Wei Quan
- Department of NeurosurgeryTianjin Medical University General HospitalTianjinChina
- Tianjin Neurological Institute, Key Laboratory of Post Neuro‐injury Neuro‐repair and Regeneration in Central Nervous System, State Key Laboratory of Experimental HematologyMinistry of EducationTianjinChina
| | - Rongcai Jiang
- Department of NeurosurgeryTianjin Medical University General HospitalTianjinChina
- Tianjin Neurological Institute, Key Laboratory of Post Neuro‐injury Neuro‐repair and Regeneration in Central Nervous System, State Key Laboratory of Experimental HematologyMinistry of EducationTianjinChina
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3
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Lin D, Yu J, Lin L, Ou Q, Quan H. MRPS6 modulates glucose-stimulated insulin secretion in mouse islet cells through mitochondrial unfolded protein response. Sci Rep 2023; 13:16173. [PMID: 37758822 PMCID: PMC10533529 DOI: 10.1038/s41598-023-43438-7] [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: 05/13/2023] [Accepted: 09/24/2023] [Indexed: 09/29/2023] Open
Abstract
Lack of efficient insulin secretion from the pancreas can lead to impaired glucose tolerance (IGT), prediabetes, and diabetes. We have previously identified two IGT-associated single nucleotide polymorphisms (SNPs) rs62212118 and rs13052524 located at two overlapping genes: MRPS6 and SLC5A3. In this study, we show that MRPS6 but not SLC5A3 regulates glucose-stimulated insulin secretion (GSIS) in primary human β-cell and a mouse pancreatic insulinoma β-cell line. Data mining and biochemical studies reveal that MRPS6 is positively regulated by the mitochondrial unfolded protein response (UPRmt), but feedback inhibits UPRmt. Disruption of such feedback by MRPS6 knockdown causes UPRmt hyperactivation in high glucose conditions, hence elevated ROS levels, increased apoptosis, and impaired GSIS. Conversely, MRPS6 overexpression reduces UPRmt, mitigates high glucose-induced ROS levels and apoptosis, and enhances GSIS in an ATF5-dependent manner. Consistently, UPRmt up-regulation or down-regulation by modulating ATF5 expression is sufficient to decrease or increase GSIS. The negative role of UPRmt in GSIS is further supported by analysis of public transcriptomic data from murine islets. In all, our studies identify MRPS6 and UPRmt as novel modulators of GSIS and apoptosis in β-cells, contributing to our understanding of the molecular and cellular mechanisms of IGT, prediabetes, and diabetes.
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Affiliation(s)
- Danhong Lin
- Department of Endocrinology, Hainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, No.19 Xiuhua Road, Haikou, 570311, Hainan, China
| | - Jingwen Yu
- Department of Endocrinology, Hainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, No.19 Xiuhua Road, Haikou, 570311, Hainan, China
| | - Leweihua Lin
- Department of Endocrinology, Hainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, No.19 Xiuhua Road, Haikou, 570311, Hainan, China
| | - Qianying Ou
- Department of Endocrinology, Hainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, No.19 Xiuhua Road, Haikou, 570311, Hainan, China
| | - Huibiao Quan
- Department of Endocrinology, Hainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, No.19 Xiuhua Road, Haikou, 570311, Hainan, China.
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4
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Gędek A, Koziorowski D, Szlufik S. Assessment of factors influencing glymphatic activity and implications for clinical medicine. Front Neurol 2023; 14:1232304. [PMID: 37767530 PMCID: PMC10520725 DOI: 10.3389/fneur.2023.1232304] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 08/22/2023] [Indexed: 09/29/2023] Open
Abstract
The glymphatic system is a highly specialized fluid transport system in the central nervous system. It enables the exchange of the intercellular fluid of the brain, regulation of the movement of this fluid, clearance of unnecessary metabolic products, and, potentially, brain immunity. In this review, based on the latest scientific reports, we present the mechanism of action and function of the glymphatic system and look at the role of factors influencing its activity. Sleep habits, eating patterns, coexisting stress or hypertension, and physical activity can significantly affect glymphatic activity. Modifying them can help to change lives for the better. In the next section of the review, we discuss the connection between the glymphatic system and neurological disorders. Its association with many disease entities suggests that it plays a major role in the physiology of the whole brain, linking many pathophysiological pathways of individual diseases.
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Affiliation(s)
- Adam Gędek
- Department of Neurology, Faculty of Health Sciences, Medical University of Warsaw, Warsaw, Poland
- Praski Hospital, Warsaw, Poland
| | - Dariusz Koziorowski
- Department of Neurology, Faculty of Health Sciences, Medical University of Warsaw, Warsaw, Poland
| | - Stanisław Szlufik
- Department of Neurology, Faculty of Health Sciences, Medical University of Warsaw, Warsaw, Poland
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5
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Sánchez-González JR, Nicieza AG. Declining metabolic scaling parallels an ontogenetic change from elongate to deep-bodied shapes in juvenile Brown trout. Curr Zool 2023; 69:294-303. [PMID: 37351295 PMCID: PMC10284058 DOI: 10.1093/cz/zoac042] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 05/16/2022] [Accepted: 05/17/2022] [Indexed: 09/07/2023] Open
Abstract
Body shape and metabolic rate can be important determinants of animal performance, yet often their effects on influential traits are evaluated in a non-integrated way. This creates an important gap because the integration between shape and metabolism may be crucial to evaluate metabolic scaling theories. Here, we measured standard metabolic rate in 1- and 2-years old juvenile brown trout Salmo trutta, and used a geometric morphometrics approach to extricate the effects of ontogeny and size on the link between shape and metabolic scaling. We evidenced near-isometric ontogenetic scaling of metabolic rate with size, but also a biphasic pattern driven by a significant change in metabolic scaling, from positive to negative allometry. Moreover, the change in metabolic allometry parallels an ontogenetic change from elongate to deep-bodied shapes. This is consistent with the dynamic energy budget (DEB) and surface area (SA) theories, but not with the resource transport network theory which predicts increasing allometric exponents for trends towards more robust, three-dimensional bodies. In addition, we found a relationship between body shape and size independent metabolic rate, with a positive correlation between robustness and metabolic rate, which fits well within the view of Pace-of-Life Syndromes (POLS). Finally, our results align with previous studies that question the universality of metabolic scaling exponents and propose other mechanistic models explaining the diversity of metabolic scaling relationships or emphasizing the potential contribution of ecological factors.
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Affiliation(s)
- Jorge-Rubén Sánchez-González
- Department of Organisms and Systems Biology, University of Oviedo, 33006 Oviedo, Spain
- Department of Animal Science-Wildlife Section, University of Lleida, 25006 Lleida, Spain
| | - Alfredo G Nicieza
- Department of Organisms and Systems Biology, University of Oviedo, 33006 Oviedo, Spain
- Biodiversity Research Institute (IMIB), University of Oviedo-Principality of Asturias-CSIC, 33600 Mieres, Spain
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6
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Sastri KT, Gupta NV, M S, Chakraborty S, Kumar H, Chand P, Balamuralidhara V, Gowda D. Nanocarrier facilitated drug delivery to the brain through intranasal route: A promising approach to transcend bio-obstacles and alleviate neurodegenerative conditions. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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7
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Levitsky DA, Barre L, Michael JJ, Zhong Y, He Y, Mizia A, Kaila S. The Rise and Fall of Physiological Theories of the Control of Human Eating Behavior. Front Nutr 2022; 9:826334. [PMID: 35662925 PMCID: PMC9159371 DOI: 10.3389/fnut.2022.826334] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 02/17/2022] [Indexed: 12/14/2022] Open
Abstract
Kuhns was the first to suggest that theories in science do not develop in small increments but rather in major leaps to paradigms that examine the same question through very different perspectives. Theories on the mechanism responsible for control of human food intake fall into Kuhn’s description. This article describes how the two major theories of the control of food intake in humans, the Glucostatic Theory, and the Lipostatic Theory, showed initial promise as explanations, but later deteriorated with the slow accumulation experimental data. The locus of theories considered eating behavior as a part of physiological system that regulates the storage of energy on the body. We challenge this fundamental belief with data which suggests that we must be ready to accept a major change in the way we think about eating behavior if we are ever to decrease the prevalence of obesity.
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Affiliation(s)
- David A Levitsky
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, United States.,Department of Psychology, Cornell University, Ithaca, NY, United States
| | - Laura Barre
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, United States
| | | | - Yingyi Zhong
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, United States
| | - Yitong He
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, United States
| | - Alyse Mizia
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, United States
| | - Sahib Kaila
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, United States
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8
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Dietary lipid droplet structure in postnatal life improves hepatic energy and lipid metabolism in a mouse model for postnatal programming. Pharmacol Res 2022; 179:106193. [DOI: 10.1016/j.phrs.2022.106193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 03/09/2022] [Accepted: 03/24/2022] [Indexed: 11/23/2022]
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9
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Boruah D. Effect of energy requirements in the growth of brain tumor: a theoretical approach. Biomed Phys Eng Express 2021; 8. [PMID: 34654010 DOI: 10.1088/2057-1976/ac3056] [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: 07/28/2021] [Accepted: 10/15/2021] [Indexed: 11/12/2022]
Abstract
A malignant tumor is an uncontrolled growth of tissues receiving energy in form of the nutrients provided by the microvascular networks. It is proposed that the supplied energy to a tumor is used for three purposes: the creation of new cells, maintenance of tumor cells, and tumor volume expansion by overcoming external pressure. A mathematical model studying the effects of energy required for maintenance and overcoming external pressure, the energy required creating a single cell, death rate, and tumor cell density on tumor development has been formulated. Including a term, residual energy for tumor growth in the tumor growth equation, the well-known logistic equation has been re-derived for tumors. Analytical solutions have been developed, and numerical analysis for the growth in brain tumors with the variation of parameters related to energy supply, the energy required for maintenance, and expansion of tumor has been performed. Expressions for the tumor growth rate(r) and carrying capacity(C) of the tumor are formulated in terms of the parameters used in the model. The range of 'r', estimated using our model is found within the ranges of tumor growth rates in gliomas reported by the other researchers. Selecting the model parameters precisely for a particular individual, the tumor growth rate and carrying capacity could be estimated accurately. Our study indicates that the actual growth rate and carrying capacity of a tumor reduce and tumor saturation time increases with the increase of death rate, the energy required for a single cell division, and energy requirement for the tumor cell maintenance.
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Affiliation(s)
- Dibyajyoti Boruah
- Department of Pathology, Armed Forces Medical College, Pune-411040 Maharashtra, India
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10
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Mogensen FLH, Delle C, Nedergaard M. The Glymphatic System (En)during Inflammation. Int J Mol Sci 2021; 22:7491. [PMID: 34299111 PMCID: PMC8305763 DOI: 10.3390/ijms22147491] [Citation(s) in RCA: 80] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 07/04/2021] [Accepted: 07/08/2021] [Indexed: 01/15/2023] Open
Abstract
The glymphatic system is a fluid-transport system that accesses all regions of the brain. It facilitates the exchange of cerebrospinal fluid and interstitial fluid and clears waste from the metabolically active brain. Astrocytic endfeet and their dense expression of the aquaporin-4 water channels promote fluid exchange between the perivascular spaces and the neuropil. Cerebrospinal and interstitial fluids are together transported back to the vascular compartment by meningeal and cervical lymphatic vessels. Multiple lines of work show that neurological diseases in general impair glymphatic fluid transport. Insofar as the glymphatic system plays a pseudo-lymphatic role in the central nervous system, it is poised to play a role in neuroinflammation. In this review, we discuss how the association of the glymphatic system with the meningeal lymphatic vessel calls for a renewal of established concepts on the CNS as an immune-privileged site. We also discuss potential approaches to target the glymphatic system to combat neuroinflammation.
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Affiliation(s)
- Frida Lind-Holm Mogensen
- Center for Translational Neuromedicine, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark; (F.L.-H.M.); (C.D.)
| | - Christine Delle
- Center for Translational Neuromedicine, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark; (F.L.-H.M.); (C.D.)
| | - Maiken Nedergaard
- Center for Translational Neuromedicine, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark; (F.L.-H.M.); (C.D.)
- Center for Translational Neuromedicine, University of Rochester Medical Center, Rochester, NY 14642, USA
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11
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Zhou J, Guo P, Guo Z, Sun X, Chen Y, Feng H. Fluid metabolic pathways after subarachnoid hemorrhage. J Neurochem 2021; 160:13-33. [PMID: 34160835 DOI: 10.1111/jnc.15458] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 05/12/2021] [Accepted: 06/20/2021] [Indexed: 01/05/2023]
Abstract
Aneurysmal subarachnoid hemorrhage (aSAH) is a devastating cerebrovascular disease with high mortality and morbidity. In recent years, a large number of studies have focused on the mechanism of early brain injury (EBI) and delayed cerebral ischemia (DCI), including vasospasm, neurotoxicity of hematoma and neuroinflammatory storm, after aSAH. Despite considerable efforts, no novel drugs have significantly improved the prognosis of patients in phase III clinical trials, indicating the need to further re-examine the multifactorial pathophysiological process that occurs after aSAH. The complex pathogenesis is reflected by the destruction of the dynamic balance of the energy metabolism in the nervous system after aSAH, which prevents the maintenance of normal neural function. This review focuses on the fluid metabolic pathways of the central nervous system (CNS), starting with ruptured aneurysms, and discusses the dysfunction of blood circulation, cerebrospinal fluid (CSF) circulation and the glymphatic system during disease progression. It also proposes a hypothesis on the metabolic disorder mechanism and potential therapeutic targets for aSAH patients.
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Affiliation(s)
- Jiru Zhou
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.,Department of Neurosurgery and State Key Laboratory of Trauma, Burn and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,Chongqing Key Laboratory of Precision Neuromedicine and Neuroregeneration, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Peiwen Guo
- Department of Neurosurgery and State Key Laboratory of Trauma, Burn and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,Chongqing Key Laboratory of Precision Neuromedicine and Neuroregeneration, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Zongduo Guo
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xiaochuan Sun
- Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yujie Chen
- Department of Neurosurgery and State Key Laboratory of Trauma, Burn and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,Chongqing Key Laboratory of Precision Neuromedicine and Neuroregeneration, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Hua Feng
- Department of Neurosurgery and State Key Laboratory of Trauma, Burn and Combined Injury, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,Chongqing Key Laboratory of Precision Neuromedicine and Neuroregeneration, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
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12
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Gould LM, Hirsch KR, Blue MNM, Cabre HE, Brewer GJ, Smith-Ryan AE. Effects of adiposity and body composition on adjusted resting energy expenditure in women. Am J Hum Biol 2021; 34:e23610. [PMID: 33961322 DOI: 10.1002/ajhb.23610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Revised: 04/09/2021] [Accepted: 04/19/2021] [Indexed: 11/07/2022] Open
Abstract
OBJECTIVES Fat-free mass (FFM) accounts for ~80% of the variance in resting energy expenditure (REE), and this relationship is complicated by adiposity. The objective was to compare adjusted REE and contributions of skeletal lean mass and fat mass (FM) to adjusted REE in women with varying adiposity levels using a novel approach. METHODS Women were divided into tertiles by body fat percent (%fat): Tertile 1 (T1): %fat = 18.5%-28.4%; Tertile 2 (T2): %fat = 28.5%-33.8%; Tertile 3 (T3): %fat = 34.0%-61.0%. Outcome measures were measured and adjusted REE, body composition (skeletal lean mass, FM, %fat) from dual-energy X-ray absorptiometry, and percent contribution of skeletal lean mass and FM to adjusted REE. RESULTS The main effect for tertiles (T1 vs. T2 vs. T3) was significant (p = .001); REE was significantly higher in T3 versus both T1 by 281 kcal/day (p = .001) and T2 by 215 kcal/day (p = .001). Expenditure from skeletal lean mass in T1 was significantly higher than T3 by 3.2% (p = .001). T3 had a significantly higher FM contribution than T1 by 5.1% (p = .001) and T2 by 3.9% (p = .001). CONCLUSIONS Women with elevated %fat experienced lower skeletal lean mass contribution and higher FM contribution to adjusted REE. FM may explain more of the variance in REE between women of different levels of adiposity.
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Affiliation(s)
- Lacey M Gould
- Applied Physiology Laboratory, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Katie R Hirsch
- Applied Physiology Laboratory, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,Human Movement Science Curriculum, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Malia N M Blue
- Applied Physiology Laboratory, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,Human Movement Science Curriculum, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,Center for Translational Research in Aging & Longevity, University of Arkansas for Medical Sciences, Little Rock, Alaska, USA
| | - Hannah E Cabre
- Applied Physiology Laboratory, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,Human Movement Science Curriculum, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Gabrielle J Brewer
- Applied Physiology Laboratory, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.,Center for Translational Research in Aging & Longevity, University of Arkansas for Medical Sciences, Little Rock, Alaska, USA
| | - Abbie E Smith-Ryan
- Human Biomechanics and Applied Physiology Laboratory, High Point University, High Point, North Carolina, USA.,Korey Stringer Institute, University of Connecticut, Storrs, Connecticut, USA.,Department of Nutrition, Gillings School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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13
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Okue S, Ishikawa E, Nakahara R, Ito T, Okura T, Sakae M, Miura A, Ozaki-Masuzawa Y, Hosono T, Seki T. Fish oil suppresses obesity more potently in lean mice than in diet-induced obese mice but ameliorates steatosis in such obese mice. Biosci Biotechnol Biochem 2021; 85:421-429. [PMID: 33604637 DOI: 10.1093/bbb/zbaa038] [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: 06/30/2020] [Accepted: 08/18/2020] [Indexed: 11/14/2022]
Abstract
This study sought to clarify the antiobesity effects of fish oil (FO) in terms of prevention and amelioration. An isocaloric diet composed of lard or FO was given to lean C57BL/6J mice for the study of prevention and high-fat diet-induced obese (DIO) mice for the study of amelioration for 4 weeks. Body weight gain and food efficiency were potently suppressed by FO in lean mice compared to lard diet-fed mice. Uncoupling protein-1 (UCP-1) expression in inguinal white adipose tissue (WAT) was also significantly induced by FO in lean mice. FO also suppressed body weight gain and food efficiency in DIO mice but did not reduce body weight. FO ameliorated liver steatosis in DIO mice by mildly inducing UCP-1 in inguinal WAT. FO suppressed obesity more potently in lean mice than in DIO mice but ameliorated steatosis in the DIO mice.
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Affiliation(s)
- Sachiko Okue
- Department of Applied Life Sciences, Nihon University Graduate School of Bioresource Sciences, Kanagawa, Japan
| | - Eimi Ishikawa
- Department of Chemistry and Life Science, Collage of Bioresource Sciences, Nihon University, Kanagawa, Japan
| | - Ren Nakahara
- Department of Applied Life Sciences, Nihon University Graduate School of Bioresource Sciences, Kanagawa, Japan
| | - Tsubasa Ito
- Department of Chemistry and Life Science, Collage of Bioresource Sciences, Nihon University, Kanagawa, Japan
| | - Takumi Okura
- Department of Chemistry and Life Science, Collage of Bioresource Sciences, Nihon University, Kanagawa, Japan
| | - Mana Sakae
- Department of Chemistry and Life Science, Collage of Bioresource Sciences, Nihon University, Kanagawa, Japan
| | - Atsushi Miura
- Department of Chemistry and Life Science, Collage of Bioresource Sciences, Nihon University, Kanagawa, Japan
| | - Yori Ozaki-Masuzawa
- Department of Chemistry and Life Science, Collage of Bioresource Sciences, Nihon University, Kanagawa, Japan
| | - Takashi Hosono
- Department of Applied Life Sciences, Nihon University Graduate School of Bioresource Sciences, Kanagawa, Japan.,Department of Chemistry and Life Science, Collage of Bioresource Sciences, Nihon University, Kanagawa, Japan
| | - Taiichiro Seki
- Department of Applied Life Sciences, Nihon University Graduate School of Bioresource Sciences, Kanagawa, Japan.,Department of Chemistry and Life Science, Collage of Bioresource Sciences, Nihon University, Kanagawa, Japan
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14
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Casanova N, Beaulieu K, Oustric P, O'Connor D, Gibbons C, Duarte C, Blundell J, Stubbs RJ, Finlayson G, Hopkins M. Body Fatness Influences Associations of Body Composition and Energy Expenditure with Energy Intake in Healthy Women. Obesity (Silver Spring) 2021; 29:125-132. [PMID: 33200550 DOI: 10.1002/oby.23034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 08/12/2020] [Accepted: 08/18/2020] [Indexed: 12/20/2022]
Abstract
OBJECTIVE This study aimed to investigate the influence of body fatness on the associations of body composition and energy expenditure (EE) with energy intake (EI). METHODS Data from 93 women (BMI = 25.5 [SD 4.2] kg/m2 ) recruited for two studies (Study 1, n = 48, BMI = 25.0-34.9 kg/m2 ; Study 2, n = 45, BMI = 18.5-24.9 kg/m2 ) were examined. Body composition, resting metabolic rate (RMR), and test meal EI were assessed during a laboratory probe day. Physical activity, total daily EE (TDEE), and self-reported free-living 24-hour EI were collected during 7 days. RESULTS In the whole sample, fat-free mass (r = 0.45; P < 0.001), RMR (r = 0.41; P < 0.001), and TDEE (r = 0.39; P < 0.001), but not fat mass (r = 0.17; P = 0.11), were positively associated with free-living 24-hour EI. Body fat percentage moderated the associations of RMR (β = -1.88; P = 0.02) and TDEE (β = -1.91; P = 0.03) with mean free-living 24-hour EI. Fat mass was negatively associated with test meal EI only in the leaner group (r = -0.43; P = 0.004), and a weak nonlinear association was observed in the whole sample (r2 = 0.092; P = 0.04). CONCLUSIONS Body fat percentage appears to moderate the associations between EE and daily EI. Furthermore, the negative association between fat mass and test meal EI observed in leaner individuals was absent in those with higher body fatness. Therefore, higher levels of body fatness may weaken the coupling between EE and EI.
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Affiliation(s)
- Nuno Casanova
- School of Food Science and Nutrition, Faculty of Environment, University of Leeds, Leeds, UK
| | - Kristine Beaulieu
- School of Psychology, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - Pauline Oustric
- School of Psychology, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - Dominic O'Connor
- School of Psychology, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - Catherine Gibbons
- School of Psychology, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - Cristiana Duarte
- School of Psychology, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - John Blundell
- School of Psychology, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - R James Stubbs
- School of Psychology, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - Graham Finlayson
- School of Psychology, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - Mark Hopkins
- School of Food Science and Nutrition, Faculty of Environment, University of Leeds, Leeds, UK
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15
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Gansemer ER, McCommis KS, Martino M, King-McAlpin AQ, Potthoff MJ, Finck BN, Taylor EB, Rutkowski DT. NADPH and Glutathione Redox Link TCA Cycle Activity to Endoplasmic Reticulum Homeostasis. iScience 2020; 23:101116. [PMID: 32417402 PMCID: PMC7254477 DOI: 10.1016/j.isci.2020.101116] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 03/25/2020] [Accepted: 04/27/2020] [Indexed: 02/08/2023] Open
Abstract
Many metabolic diseases disrupt endoplasmic reticulum (ER) homeostasis, but little is known about how metabolic activity is communicated to the ER. Here, we show in hepatocytes and other metabolically active cells that decreasing the availability of substrate for the tricarboxylic acid (TCA) cycle diminished NADPH production, elevated glutathione oxidation, led to altered oxidative maturation of ER client proteins, and attenuated ER stress. This attenuation was prevented when glutathione oxidation was disfavored. ER stress was also alleviated by inhibiting either TCA-dependent NADPH production or Glutathione Reductase. Conversely, stimulating TCA activity increased NADPH production, glutathione reduction, and ER stress. Validating these findings, deletion of the Mitochondrial Pyruvate Carrier-which is known to decrease TCA cycle activity and protect the liver from steatohepatitis-also diminished NADPH, elevated glutathione oxidation, and alleviated ER stress. Together, our results demonstrate a novel pathway by which mitochondrial metabolic activity is communicated to the ER through the relay of redox metabolites.
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Affiliation(s)
- Erica R Gansemer
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | - Kyle S McCommis
- Center for Human Nutrition, Department of Medicine, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110, USA
| | - Michael Martino
- Center for Human Nutrition, Department of Medicine, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110, USA
| | - Abdul Qaadir King-McAlpin
- Department of Pharmacology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | - Matthew J Potthoff
- Department of Pharmacology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Obesity Research Initiative, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Abboud Cardiovascular Research Center, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Fraternal Order of Eagles Diabetes Research Center, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | - Brian N Finck
- Center for Human Nutrition, Department of Medicine, Washington University School of Medicine in Saint Louis, St. Louis, MO 63110, USA
| | - Eric B Taylor
- Department of Biochemistry, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Obesity Research Initiative, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Abboud Cardiovascular Research Center, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Fraternal Order of Eagles Diabetes Research Center, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Holden Comprehensive Cancer Center, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
| | - D Thomas Rutkowski
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Abboud Cardiovascular Research Center, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Fraternal Order of Eagles Diabetes Research Center, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Holden Comprehensive Cancer Center, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.
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16
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D'Andrea L, Pérez-Rodríguez FJ, de Castellarnau M, Guix S, Ribes E, Quer J, Gregori J, Bosch A, Pintó RM. The Critical Role of Codon Composition on the Translation Efficiency Robustness of the Hepatitis A Virus Capsid. Genome Biol Evol 2020; 11:2439-2456. [PMID: 31290967 PMCID: PMC6735747 DOI: 10.1093/gbe/evz146] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/08/2019] [Indexed: 12/13/2022] Open
Abstract
Hepatoviruses show an intriguing deviated codon usage, suggesting an evolutionary signature. Abundant and rare codons in the cellular genome are scarce in the human hepatitis A virus (HAV) genome, while intermediately abundant host codons are abundant in the virus. Genotype–phenotype maps, or fitness landscapes, are a means of representing a genotype position in sequence space and uncovering how genotype relates to phenotype and fitness. Using genotype–phenotype maps of the translation efficiency, we have shown the critical role of the HAV capsid codon composition in regulating translation and determining its robustness. Adaptation to an environmental perturbation such as the artificial induction of cellular shutoff—not naturally occurring in HAV infection—involved movements in the sequence space and dramatic changes of the translation efficiency. Capsid rare codons, including abundant and rare codons of the cellular genome, slowed down the translation efficiency in conditions of no cellular shutoff. In contrast, rare capsid codons that are abundant in the cellular genome were efficiently translated in conditions of shutoff. Capsid regions very rich in slowly translated codons adapt to shutoff through sequence space movements from positions with highly robust translation to others with diminished translation robustness. These movements paralleled decreases of the capsid physical and biological robustness, and resulted in the diversification of capsid phenotypes. The deviated codon usage of extant hepatoviruses compared with that of their hosts may suggest the occurrence of a virus ancestor with an optimized codon usage with respect to an unknown ancient host.
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Affiliation(s)
- Lucía D'Andrea
- Enteric Virus Laboratory, Department of Genetics, Microbiology and Statistics, School of Biology, and Institute of Nutrition and Safety, University of Barcelona, Spain
| | - Francisco-Javier Pérez-Rodríguez
- Enteric Virus Laboratory, Department of Genetics, Microbiology and Statistics, School of Biology, and Institute of Nutrition and Safety, University of Barcelona, Spain
| | - Montserrat de Castellarnau
- Enteric Virus Laboratory, Department of Genetics, Microbiology and Statistics, School of Biology, and Institute of Nutrition and Safety, University of Barcelona, Spain
| | - Susana Guix
- Enteric Virus Laboratory, Department of Genetics, Microbiology and Statistics, School of Biology, and Institute of Nutrition and Safety, University of Barcelona, Spain
| | - Enric Ribes
- Enteric Virus Laboratory, Department of Cell Biology, Physiology and Immunology, School of Biology, University of Barcelona, Spain
| | - Josep Quer
- Liver Unit, Internal Medicine, Hepatic Diseases Laboratory, Vall d'Hebron Research Institute-Hospital Universitari Vall d'Hebron (VHIR-HUVH), Barcelona, Spain.,Centre of the Biomedical Research Network (CIBER) for Hepatic and Digestive Diseases (CIBERehd), Instituto de Salud Carlos III
| | - Josep Gregori
- Liver Unit, Internal Medicine, Hepatic Diseases Laboratory, Vall d'Hebron Research Institute-Hospital Universitari Vall d'Hebron (VHIR-HUVH), Barcelona, Spain.,Roche Diagnostics SL, Barcelona, Spain
| | - Albert Bosch
- Enteric Virus Laboratory, Department of Genetics, Microbiology and Statistics, School of Biology, and Institute of Nutrition and Safety, University of Barcelona, Spain
| | - Rosa M Pintó
- Enteric Virus Laboratory, Department of Genetics, Microbiology and Statistics, School of Biology, and Institute of Nutrition and Safety, University of Barcelona, Spain
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17
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The drive to eat in homo sapiens: Energy expenditure drives energy intake. Physiol Behav 2020; 219:112846. [PMID: 32081814 DOI: 10.1016/j.physbeh.2020.112846] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 02/04/2020] [Accepted: 02/10/2020] [Indexed: 12/15/2022]
Abstract
The drive to eat is a component of appetite control, independent of the omnivorous habit of humans, and separate from food choice, satiety and food reward. The drive forms part of the tonic component of appetite and arises from biological needs; it is distinct from episodic aspects of appetite which are heavily influenced by culture and the environment (and which reflect the omnivorous habit). It is proposed that the tonic drive to eat reflects a need state generated by metabolic energy expenditure (EE) required to maintain the functioning and integrity of vital organs. Specifically, the tonic drive is quantitatively associated with fat-free mass (FFM) and resting metabolic rate (RMR). A rational proposition is that high metabolic rate organs (such as heart, liver, kidneys, brain) together with skeletal muscle generate a metabolic need which drives energy intake (EI). The basic phenomenon of a relationship between FFM, RMR and EI, first published in 2011, has been substantially replicated and there are at least 14 concordant published studies carried out in 9 different countries (and 4 continents) with various ethnic groups of lean and obese humans. These studies demonstrate that FFM and RMR represent major determinants of the drive to eat, and this is rational from an evolutionary perspective. The EE of bodily movements through skeletal muscle activity (namely physical activity and exercise) represents another driver which is clearly but more weakly associated with an increase in EI. This account of appetite control, developed within an energy balance framework, is consistent with the apparent inexorable escalation of fatness in individual humans, and for the progressive increase in the prevalence of obesity which, among other factors, reflects the difficulty of managing the biological drive to eat.
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18
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Martinac AD, Bilston LE. Computational modelling of fluid and solute transport in the brain. Biomech Model Mechanobiol 2019; 19:781-800. [DOI: 10.1007/s10237-019-01253-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 11/05/2019] [Indexed: 01/10/2023]
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19
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Caputa G, Castoldi A, Pearce EJ. Metabolic adaptations of tissue-resident immune cells. Nat Immunol 2019; 20:793-801. [DOI: 10.1038/s41590-019-0407-0] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 04/26/2019] [Indexed: 12/25/2022]
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20
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Heymsfield SB, Peterson CM, Bourgeois B, Thomas DM, Gallagher D, Strauss B, Müller MJ, Bosy-Westphal A. Human energy expenditure: advances in organ-tissue prediction models. Obes Rev 2018; 19:1177-1188. [PMID: 30035381 PMCID: PMC6107421 DOI: 10.1111/obr.12718] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 04/23/2018] [Accepted: 05/09/2018] [Indexed: 01/02/2023]
Abstract
Humans expend energy at rest (REE), and this major energy exchange component is now usually estimated using statistical equations that include weight and other predictor variables. While these formulas are useful in evaluating an individual's or group's REE, an important gap remains: available statistical models are inadequate for explaining underlying organ-specific and tissue-specific mechanisms accounting for resting heat production. The lack of such systems level REE prediction models leaves many research questions unanswered. A potential approach that can fill this gap began with investigators who first showed in animals and later in humans that REE reflects the summated heat production rates of individual organs and tissues. Today, using advanced imaging technologies, REE can be accurately estimated from the measured in vivo mass of 10 organ-tissue mass components combined with their respective mass-specific metabolic rates. This review examines the next frontier of energy expenditure models and discusses how organ-tissue models have the potential not only to better predict REE but also to provide insights into how perturbations in organ mass lead to structure-function changes across other interacting organ systems. The introductory ideas advanced in this review provide a framework for future human energy expenditure modelling research.
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Affiliation(s)
| | | | | | - Diana M. Thomas
- Department of Mathematical Sciences, United States Military Academy West Point, NY, USA
| | - Dympna Gallagher
- Columbia University, College of Physicians and Surgeons, New York, NY, USA
| | - Boyd Strauss
- Dept. of Medicine, School of Clinical Sciences, Monash University, Australia and Institute of Inflammation and Repair, Faculty of Biology, Medicine and Health, University of Manchester, United Kingdom
| | - Manfred J. Müller
- Department of Human Nutrition and Food Science, Christian-Albrecht’s-University of Kiel, Kiel, Germany
| | - Anja Bosy-Westphal
- Department of Human Nutrition and Food Science, Christian-Albrecht’s-University of Kiel, Kiel, Germany
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21
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Tapia P, Fernández-Galilea M, Robledo F, Mardones P, Galgani JE, Cortés VA. Biology and pathological implications of brown adipose tissue: promises and caveats for the control of obesity and its associated complications. Biol Rev Camb Philos Soc 2017; 93:1145-1164. [DOI: 10.1111/brv.12389] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 11/10/2017] [Accepted: 11/14/2017] [Indexed: 12/15/2022]
Affiliation(s)
- Pablo Tapia
- Department of Nutrition, Diabetes and Metabolism, School of Medicine; Pontificia Universidad Católica de Chile, Marcoleta 367; Santiago, 8330024 Chile
| | - Marta Fernández-Galilea
- Department of Nutrition, Diabetes and Metabolism, School of Medicine; Pontificia Universidad Católica de Chile, Marcoleta 367; Santiago, 8330024 Chile
| | - Fermín Robledo
- Department of Nutrition, Diabetes and Metabolism, School of Medicine; Pontificia Universidad Católica de Chile, Marcoleta 367; Santiago, 8330024 Chile
| | - Pablo Mardones
- Research and Innovation Office, School of Engineering; Pontificia Universidad Católica de Chile, Marcoleta 367; Santiago, 8330024 Chile
| | - José E. Galgani
- Department of Nutrition, Diabetes and Metabolism, School of Medicine; Pontificia Universidad Católica de Chile, Marcoleta 367; Santiago, 8330024 Chile
- Departamento Ciencias de la Salud; Carrera de Nutrición y Dietética, Pontificia Universidad Católica de Chile, Marcoleta 367; Santiago, 8330024 Chile
| | - Víctor A. Cortés
- Department of Nutrition, Diabetes and Metabolism, School of Medicine; Pontificia Universidad Católica de Chile, Marcoleta 367; Santiago, 8330024 Chile
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22
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Lahaye C, Gentes E, Farigon N, Miolanne M, Pouget M, Palmier C, Venant V, Bouteloup C, Boirie Y. Comment définir et diagnostiquer la dénutrition chez le sujet obèse ? NUTR CLIN METAB 2017. [DOI: 10.1016/j.nupar.2017.09.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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23
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Meerman R, Brown A. Why diets fail: eating more, moving less. Postgrad Med J 2017; 94:67. [PMID: 28860347 DOI: 10.1136/postgradmedj-2017-135153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/16/2017] [Indexed: 11/04/2022]
Affiliation(s)
- Ruben Meerman
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, New South Wales, Australia
| | - Andrew Brown
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, New South Wales, Australia
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24
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Mitra S, Fernandez-Del-Valle M, Hill JE. The role of MRI in understanding the underlying mechanisms in obesity associated diseases. Biochim Biophys Acta Mol Basis Dis 2016; 1863:1115-1131. [PMID: 27639834 DOI: 10.1016/j.bbadis.2016.09.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 09/08/2016] [Accepted: 09/08/2016] [Indexed: 02/07/2023]
Abstract
Obesity and its possible association with diseases including diabetes and cardiovascular diseases have been studied for decades for its impact on healthcare. Recent studies clearly indicate the need for developing accurate and reproducible methodologies for assessing body fat content and distribution. Body fat distribution plays a significant role in developing an insight in the underlying mechanisms in which adipose tissue is linked with various diseases. Among imaging technologies including computerized axial tomography (CAT or CT), magnetic resonance imaging (MRI), and magnetic resonance spectroscopy (MRS), MRI and MRS seem to be the best emerging techniques and together are being considered as the gold standard for body fat content and distribution. This paper reviews studies up to the present time involving different methodologies of these two emerging technologies and presents the basic concepts of MRI and MRS with required novel image analysis techniques in accurate, quantitative, and direct assessment of body fat content and distribution. This article is part of a Special Issue entitled: Oxidative Stress and Mitochondrial Quality in Diabetes/Obesity and Critical Illness Spectrum of Diseases - edited by P. Hemachandra Reddy.
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Affiliation(s)
| | | | - Jason E Hill
- Texas Tech University, Lubbock, TX, United States
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25
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Boirie Y, Farigon N, Miolanne M, Montel F, Lahaye C, Guillet C, Walrand S. L’obésité sarcopénique : causes et conséquences. CAHIERS DE NUTRITION ET DE DIETETIQUE 2016. [DOI: 10.1016/j.cnd.2015.12.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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26
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Ramirez J, Berezuk C, McNeely AA, Gao F, McLaurin J, Black SE. Imaging the Perivascular Space as a Potential Biomarker of Neurovascular and Neurodegenerative Diseases. Cell Mol Neurobiol 2016; 36:289-99. [PMID: 26993511 DOI: 10.1007/s10571-016-0343-6] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 02/03/2016] [Indexed: 12/11/2022]
Abstract
Although the brain lacks conventional lymphatic vessels found in peripheral tissue, evidence suggests that the space surrounding the vasculature serves a similar role in the clearance of fluid and metabolic waste from the brain. With aging, neurodegeneration, and cerebrovascular disease, these microscopic perivascular spaces can become enlarged, allowing for visualization and quantification on structural MRI. The purpose of this review is to: (i) describe some of the recent pre-clinical findings from basic science that shed light on the potential neurophysiological mechanisms driving glymphatic and perivascular waste clearance, (ii) review some of the pathobiological etiologies that may lead to MRI-visible enlarged perivascular spaces (ePVS), (iii) describe the possible clinical implications of ePVS, (iv) evaluate existing qualitative and quantitative techniques used for measuring ePVS burden, and (v) propose future avenues of research that may improve our understanding of this potential clinical neuroimaging biomarker for fluid and metabolic waste clearance dysfunction in neurodegenerative and neurovascular diseases.
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Affiliation(s)
- Joel Ramirez
- LC Campbell Cognitive Neurology Research Unit, Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Toronto, ON, Canada, M4N 3M5. .,Heart & Stroke Foundation Canadian Partnership for Stroke Recovery, Sunnybrook Health Sciences Centre (SHSC), Toronto, ON, Canada.
| | - Courtney Berezuk
- LC Campbell Cognitive Neurology Research Unit, Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Toronto, ON, Canada, M4N 3M5.,Heart & Stroke Foundation Canadian Partnership for Stroke Recovery, Sunnybrook Health Sciences Centre (SHSC), Toronto, ON, Canada
| | - Alicia A McNeely
- LC Campbell Cognitive Neurology Research Unit, Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Toronto, ON, Canada, M4N 3M5.,Heart & Stroke Foundation Canadian Partnership for Stroke Recovery, Sunnybrook Health Sciences Centre (SHSC), Toronto, ON, Canada
| | - Fuqiang Gao
- LC Campbell Cognitive Neurology Research Unit, Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Toronto, ON, Canada, M4N 3M5.,Heart & Stroke Foundation Canadian Partnership for Stroke Recovery, Sunnybrook Health Sciences Centre (SHSC), Toronto, ON, Canada
| | - JoAnne McLaurin
- Department of Biological Sciences, Sunnybrook Research Institute, Toronto, ON, Canada.,Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Sandra E Black
- LC Campbell Cognitive Neurology Research Unit, Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Toronto, ON, Canada, M4N 3M5.,Heart & Stroke Foundation Canadian Partnership for Stroke Recovery, Sunnybrook Health Sciences Centre (SHSC), Toronto, ON, Canada.,Department of Medicine, Neurology (SHSC), Institute of Medical Science, University of Toronto, Toronto, ON, Canada
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27
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Matinolli HM, Hovi P, Männistö S, Sipola-Leppänen M, Eriksson JG, Mäkitie O, Järvenpää AL, Andersson S, Kajantie E. Early Protein Intake Is Associated with Body Composition and Resting Energy Expenditure in Young Adults Born with Very Low Birth Weight. J Nutr 2015; 145:2084-91. [PMID: 26180246 DOI: 10.3945/jn.115.212415] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 06/24/2015] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Suboptimal nutrition during fetal life and early childhood may be important in early programming of health and disease. Preterm infants born with very low birth weight (VLBW; <1500 g) frequently receive inadequate neonatal nutrition; the long-term consequences are poorly known. OBJECTIVE We evaluated the association between early macronutrient intake and body composition in young adults born with VLBW. METHODS We collected comprehensive information on daily nutritional intake during the initial hospital stay for 127 participants of the Helsinki Study of Very Low Birth Weight Adults. We calculated mean daily intakes of energy, protein, fat, and carbohydrate during the first 9 wk of life. At the mean age of 22.5 y, the subjects underwent measurements of weight, height, body composition by dual-energy X-ray absorptiometry, and resting energy expenditure. The associations were examined by linear regression. RESULTS We found that energy, protein, and fat intakes during the first 3 wk of life, all below current recommendations, predicted adult body composition. When adjusted for sex, age, birth weight SD score, and gestational age, a 1 g · kg(-1) · d(-1) higher protein intake predicted 11.1% higher lean body mass (LBM) (95% CI: 3.7%, 18.9%) and 8.5% higher resting energy expenditure (REE) (95% CI: 0.2%, 17.0%). Among those born before 28 wk of gestation, the numbers were 22.5% (95% CI: 1.9%, 47.4%) for LBM and 22.1% (95% CI: 3.6%, 44.0%) for REE. Similar associations were seen with energy (P = 0.01, P = 0.05) and fat (P < 0.01, P = 0.03) but not with carbohydrate. Energy intake was also associated with BMI (P = 0.01) and fat intake with BMI (P < 0.01) and percentage body fat (P = 0.05). The results were little changed when adjusted for prenatal and postnatal characteristics. CONCLUSIONS At relatively low neonatal protein intake levels, additional protein intake is reflected in a healthier body composition, accompanied by a higher metabolic rate, in young adults born with VLBW 20 y earlier.
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Affiliation(s)
- Hanna-Maria Matinolli
- Department of Health, Chronic Disease Prevention Unit, National Institute for Health and Welfare, Helsinki, Finland; Institute of Health Sciences, University of Oulu, Oulu, Finland;
| | - Petteri Hovi
- Department of Health, Chronic Disease Prevention Unit, National Institute for Health and Welfare, Helsinki, Finland; Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Satu Männistö
- Department of Health, Chronic Disease Prevention Unit, National Institute for Health and Welfare, Helsinki, Finland
| | - Marika Sipola-Leppänen
- Department of Health, Chronic Disease Prevention Unit, National Institute for Health and Welfare, Helsinki, Finland; Institute of Health Sciences, University of Oulu, Oulu, Finland; Department of Pediatrics and Adolescence, Oulu University Hospital, Oulu, Finland
| | - Johan G Eriksson
- Department of Health, Chronic Disease Prevention Unit, National Institute for Health and Welfare, Helsinki, Finland; Department of General Practice and Primary Health Care, Institute of Clinical Medicine, University of Helsinki, Helsinki, Finland; Unit of General Practice, Helsinki University Hospital, Helsinki, Finland; Folkhälsan Research Centre, Helsinki, Finland; and
| | - Outi Mäkitie
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland; Folkhälsan Research Centre, Helsinki, Finland; and
| | - Anna-Liisa Järvenpää
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Sture Andersson
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Eero Kajantie
- Department of Health, Chronic Disease Prevention Unit, National Institute for Health and Welfare, Helsinki, Finland; Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland; Department of Obstetrics and Gynaecology, MRC Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
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Jarmuszkiewicz W, Woyda-Ploszczyca A, Koziel A, Majerczak J, Zoladz JA. Temperature controls oxidative phosphorylation and reactive oxygen species production through uncoupling in rat skeletal muscle mitochondria. Free Radic Biol Med 2015; 83:12-20. [PMID: 25701433 DOI: 10.1016/j.freeradbiomed.2015.02.012] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 02/05/2015] [Accepted: 02/08/2015] [Indexed: 01/31/2023]
Abstract
Mitochondrial respiratory and phosphorylation activities, mitochondrial uncoupling, and hydrogen peroxide formation were studied in isolated rat skeletal muscle mitochondria during experimentally induced hypothermia (25 °C) and hyperthermia (42 °C) compared to the physiological temperature of resting muscle (35 °C). For nonphosphorylating mitochondria, increasing the temperature from 25 to 42 °C led to a decrease in membrane potential, hydrogen peroxide production, and quinone reduction levels. For phosphorylating mitochondria, no temperature-dependent changes in these mitochondrial functions were observed. However, the efficiency of oxidative phosphorylation decreased, whereas the oxidation and phosphorylation rates and oxidative capacities of the mitochondria increased, with increasing assay temperature. An increase in proton leak, including uncoupling protein-mediated proton leak, was observed with increasing assay temperature, which could explain the reduced oxidative phosphorylation efficiency and reactive oxygen species production.
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Affiliation(s)
- Wieslawa Jarmuszkiewicz
- Department of Bioenergetics, Faculty of Biology, Adam Mickiewicz University, 61-614 Poznan, Poland.
| | - Andrzej Woyda-Ploszczyca
- Department of Bioenergetics, Faculty of Biology, Adam Mickiewicz University, 61-614 Poznan, Poland
| | - Agnieszka Koziel
- Department of Bioenergetics, Faculty of Biology, Adam Mickiewicz University, 61-614 Poznan, Poland
| | - Joanna Majerczak
- Department of Muscle Physiology, Chair of Physiology and Biochemistry, Faculty of Rehabilitation, University School of Physical Education, Krakow, Poland
| | - Jerzy A Zoladz
- Department of Muscle Physiology, Chair of Physiology and Biochemistry, Faculty of Rehabilitation, University School of Physical Education, Krakow, Poland
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Jessen NA, Munk ASF, Lundgaard I, Nedergaard M. The Glymphatic System: A Beginner's Guide. Neurochem Res 2015; 40:2583-99. [PMID: 25947369 DOI: 10.1007/s11064-015-1581-6] [Citation(s) in RCA: 1079] [Impact Index Per Article: 119.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 04/06/2015] [Accepted: 04/10/2015] [Indexed: 12/16/2022]
Abstract
The glymphatic system is a recently discovered macroscopic waste clearance system that utilizes a unique system of perivascular tunnels, formed by astroglial cells, to promote efficient elimination of soluble proteins and metabolites from the central nervous system. Besides waste elimination, the glymphatic system also facilitates brain-wide distribution of several compounds, including glucose, lipids, amino acids, growth factors, and neuromodulators. Intriguingly, the glymphatic system function mainly during sleep and is largely disengaged during wakefulness. The biological need for sleep across all species may therefore reflect that the brain must enter a state of activity that enables elimination of potentially neurotoxic waste products, including β-amyloid. Since the concept of the glymphatic system is relatively new, we will here review its basic structural elements, organization, regulation, and functions. We will also discuss recent studies indicating that glymphatic function is suppressed in various diseases and that failure of glymphatic function in turn might contribute to pathology in neurodegenerative disorders, traumatic brain injury and stroke.
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Affiliation(s)
- Nadia Aalling Jessen
- School of Medicine and Dentistry, University of Rochester Medical Center, 601 Elmwood Ave, Box 645, Rochester, NY, 14642, USA.
| | - Anne Sofie Finmann Munk
- School of Medicine and Dentistry, University of Rochester Medical Center, 601 Elmwood Ave, Box 645, Rochester, NY, 14642, USA
| | - Iben Lundgaard
- School of Medicine and Dentistry, University of Rochester Medical Center, 601 Elmwood Ave, Box 645, Rochester, NY, 14642, USA
| | - Maiken Nedergaard
- School of Medicine and Dentistry, University of Rochester Medical Center, 601 Elmwood Ave, Box 645, Rochester, NY, 14642, USA
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Marvyn PM, Bradley RM, Button EB, Mardian EB, Duncan RE. Fasting upregulates adipose triglyceride lipase and hormone-sensitive lipase levels and phosphorylation in mouse kidney. Biochem Cell Biol 2015; 93:262-7. [PMID: 25879679 DOI: 10.1139/bcb-2014-0150] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Circulating non-esterified fatty acids (NEFA) rise during fasting and are taken up by the kidneys, either directly from the plasma or during re-uptake of albumin from glomerular filtrate, and are stored as triacylglycerol (TAG). Subsequent utilization of stored fatty acids requires their hydrolytic release from cellular lipid droplets, but relatively little is known about renal lipolysis. We found that total [(3)H]triolein hydrolase activity of kidney lysates was significantly increased by 15% in the fasted state. Adipose triglyceride lipase (Atgl) and hormone-sensitive lipase (Hsl) mRNA expression was time-dependently increased by fasting, along with other fatty acid metabolism genes (Pparα, Cd36, and Aox). ATGL and HSL protein levels were also significantly induced (by 239 ± 7% and 322 ± 8%, respectively). Concomitant with changes in total protein levels, there was an increase in ATGL phosphorylation at the AMPK-regulated serine 406 site in the 14-3-3 binding motif, and an increase in HSL phosphorylation at serines 565 and 660 that are regulated by AMPK and PKA, respectively. Using immunofluorescence, we further demonstrate nearly ubiquitous expression of ATGL in the renal cortex with a concentration on the apical/lumenal surface of some cortical tubules. Our findings suggest a role for ATGL and HSL in kidney lipolysis.
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Affiliation(s)
- Phillip M Marvyn
- University of Waterloo, Department of Kinesiology, Faculty of Applied Health Sciences, 200 University Avenue W., BMH 1110, Waterloo, ON N2L 3G1, Canada
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White CR, Kearney MR. Metabolic scaling in animals: methods, empirical results, and theoretical explanations. Compr Physiol 2014; 4:231-56. [PMID: 24692144 DOI: 10.1002/cphy.c110049] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Life on earth spans a size range of around 21 orders of magnitude across species and can span a range of more than 6 orders of magnitude within species of animal. The effect of size on physiology is, therefore, enormous and is typically expressed by how physiological phenomena scale with mass(b). When b ≠ 1 a trait does not vary in direct proportion to mass and is said to scale allometrically. The study of allometric scaling goes back to at least the time of Galileo Galilei, and published scaling relationships are now available for hundreds of traits. Here, the methods of scaling analysis are reviewed, using examples for a range of traits with an emphasis on those related to metabolism in animals. Where necessary, new relationships have been generated from published data using modern phylogenetically informed techniques. During recent decades one of the most controversial scaling relationships has been that between metabolic rate and body mass and a number of explanations have been proposed for the scaling of this trait. Examples of these mechanistic explanations for metabolic scaling are reviewed, and suggestions made for comparing between them. Finally, the conceptual links between metabolic scaling and ecological patterns are examined, emphasizing the distinction between (1) the hypothesis that size- and temperature-dependent variation among species and individuals in metabolic rate influences ecological processes at levels of organization from individuals to the biosphere and (2) mechanistic explanations for metabolic rate that may explain the size- and temperature-dependence of this trait.
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Affiliation(s)
- Craig R White
- School of Biological Sciences, The University of Queensland, St Lucia, Queensland, Australia
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Pourhassan M, Eggeling B, Schautz B, Johannsen M, Kiosz D, Glüer CC, Bosy-Westphal A, Müller MJ. Relationship between submaximal oxygen uptake, detailed body composition, and resting energy expenditure in overweight subjects. Am J Hum Biol 2014; 27:397-406. [PMID: 25430076 DOI: 10.1002/ajhb.22666] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 10/09/2014] [Accepted: 11/12/2014] [Indexed: 11/07/2022] Open
Abstract
OBJECTIVE We investigated the impact of detailed body composition on aerobic fitness to determine whether regional components of fat mass have independent effects on VO2submax , and whether VO2submax and detailed body composition independently explain variation in REE. METHODS 71 healthy adults (80% female, 20% male, BMI 28.2-43.8 kg/m(2) ) were investigated. Body composition was measured by the four-compartment model together with whole body magnetic resonance imaging (MRI) to assess high and low metabolic rate organs and regional fat depots. VO2submax was estimated at 75% of predicted maximum heart rate. RESULTS There was a strong association between VO2submax and FFM and all organ masses except for heart. Skeletal muscle mass accounted for 34.8% of the variance in VO2submax . In addition, subcutaneous adipose tissue (SAT) of extremities explained additional 14.4%. FFM and FM explained 71.3% of the variance in REE. Including the components of FFM and FM, the explained variance in REE increased by about 5.8%; skeletal muscle mass explained 70.0% of the variance in REE and kidney and liver masses explained additional 7.1%. VO2submax correlated with REE. Taking into account body composition, VO2submax did not add to the variance in REE. CONCLUSION FFM is a determinant of both VO2submax and REE. Modeling either REE or VO2submax from individual components of FFM, about 77.1% of variance in REE (by muscle, liver and kidneys mass) and 34.8% of variance in VO2submax (by skeletal muscle mass) could be explained. FM explained additional variance in REE, whereas SAT of extremities added to the variance in VO2submax only.
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Affiliation(s)
- Maryam Pourhassan
- Institute of Human Nutrition and Food Science, Christian-Albrechts University, Kiel, Germany
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Rabl C, Rao MN, Schwarz JM, Mulligan K, Campos GM. Thermogenic changes after gastric bypass, adjustable gastric banding or diet alone. Surgery 2014; 156:806-12. [PMID: 25239323 DOI: 10.1016/j.surg.2014.06.070] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 06/26/2014] [Indexed: 01/06/2023]
Abstract
BACKGROUND The mechanisms by which bariatric surgery achieves weight loss (WL) are under scrutiny. We assessed changes in resting energy expenditure (REE) after gastric bypass (RYGB) and gastric banding (AGB) to determine if changes in REE are associated with WL and type of surgery. METHODS Three groups of morbidly obese patients were studied: RYGB (n = 12), AGB (n = 8), and a control group that underwent caloric restriction alone (Diet, n = 10). Studies were performed at baseline and after 14 days in all groups and 6 months after RYGB and AGB. REE (kcal/day) was measured by indirect calorimetry and adjusted for body weight (Wt-REE), and lean body mass by dual-energy X-ray absorptiometry (LBM-REE). RESULTS At baseline, REE did not differ significantly among groups (RYGB = 2,114 ± 337, AGB = 1,837 ± 154, Diet = 2,091 ± 363 kcal/day, P = .13). After 14 days, the groups had similar percent excess WL (%EWL). Neither Wt-REE nor LBM-REE changed significantly in any group. After 6 months %EWL was 49 ± 10% after RYGB and 21 ± 11% after AGB (P < .01); RYGB patients had greater increase in the percent of weight that was LBM (RYGB = 7.9 ± 3.0 vs. AGB = 1.6 ± 1.5%, P < .01). Wt-REE increased significantly only after RYGB (+2.58 ± 1.51 kcal/kg/day, P < .01). There was a significant correlation between changes in Wt-REE and %EWL (r = 0.670, P = .003). CONCLUSION The increase in Wt-REE may be a factor supporting WL after RYGB.
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Affiliation(s)
- Charlotte Rabl
- Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI; Department of Surgery, University of California San Francisco, San Francisco, CA; Department of Surgery, Paracelsus Medical University, Salzburg, Austria
| | - Madhu N Rao
- Department of Medicine, University of California San Francisco, San Francisco, CA
| | - Jean-Marc Schwarz
- Department of Medicine, University of California San Francisco, San Francisco, CA; Touro University-California, Vallejo, CA
| | - Kathleen Mulligan
- Department of Medicine, University of California San Francisco, San Francisco, CA
| | - Guilherme M Campos
- Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI; Department of Surgery, University of California San Francisco, San Francisco, CA.
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Mathematical model for the contribution of individual organs to non-zero y-intercepts in single and multi-compartment linear models of whole-body energy expenditure. PLoS One 2014; 9:e103301. [PMID: 25068692 PMCID: PMC4113365 DOI: 10.1371/journal.pone.0103301] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Accepted: 06/26/2014] [Indexed: 12/12/2022] Open
Abstract
Mathematical models for the dependence of energy expenditure (EE) on body mass and composition are essential tools in metabolic phenotyping. EE scales over broad ranges of body mass as a non-linear allometric function. When considered within restricted ranges of body mass, however, allometric EE curves exhibit ‘local linearity.’ Indeed, modern EE analysis makes extensive use of linear models. Such models typically involve one or two body mass compartments (e.g., fat free mass and fat mass). Importantly, linear EE models typically involve a non-zero (usually positive) y-intercept term of uncertain origin, a recurring theme in discussions of EE analysis and a source of confounding in traditional ratio-based EE normalization. Emerging linear model approaches quantify whole-body resting EE (REE) in terms of individual organ masses (e.g., liver, kidneys, heart, brain). Proponents of individual organ REE modeling hypothesize that multi-organ linear models may eliminate non-zero y-intercepts. This could have advantages in adjusting REE for body mass and composition. Studies reveal that individual organ REE is an allometric function of total body mass. I exploit first-order Taylor linearization of individual organ REEs to model the manner in which individual organs contribute to whole-body REE and to the non-zero y-intercept in linear REE models. The model predicts that REE analysis at the individual organ-tissue level will not eliminate intercept terms. I demonstrate that the parameters of a linear EE equation can be transformed into the parameters of the underlying ‘latent’ allometric equation. This permits estimates of the allometric scaling of EE in a diverse variety of physiological states that are not represented in the allometric EE literature but are well represented by published linear EE analyses.
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Müller MJ, Wang Z, Heymsfield SB, Schautz B, Bosy-Westphal A. Advances in the understanding of specific metabolic rates of major organs and tissues in humans. Curr Opin Clin Nutr Metab Care 2013; 16:501-8. [PMID: 23924948 DOI: 10.1097/mco.0b013e328363bdf9] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE OF REVIEW To present recent evidence on organ and tissue metabolic rates in humans to explain the variance in resting energy expenditure (REE). RECENT FINDINGS In humans, present knowledge on specific metabolic activities (i.e. ki-values) refers to seven organs and tissues - brain, heart, liver, kidneys, skeletal muscle, adipose tissue and residual mass - with ki-values of 240, 440, 200, 440, 13, 4.5 and 12 kcal/kg/day, provided by Elia in 1992. Detailed body composition data, as derived from whole body MRI together with measurements of whole body REE, were used to validate ki-values in nonobese, healthy and middle-aged adults. There is no sex difference, but minor, that is 2 and 3% deviations are found for age above 55 years and obesity, respectively. By contrast, in adolescents, differences of about 100 kcal/day or 7.3% of measured REE were observed. There is first evidence for changes in ki-values with either weight loss or weight regain after weight loss. Altogether these data suggest that in adolescence and at age above 55 years, in the obese and with weight change, organ and tissue masses differ in cellularity and/or their specific metabolic rates. Presently, direct assessment of specific organ and tissue metabolic rates in humans by either NMR spectroscopy or PET, together with detailed body composition analysis, has not been performed systematically. SUMMARY We need to become more skilled in methods and models used for detailed body composition analysis together with detailed assessment of energy expenditure in humans.
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Affiliation(s)
- Manfred J Müller
- Institut für Humanernährung und Lebensmittelkunde, Christian-Albrechts-Universität zu Kiel, Germany.
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Abstract
Diet-induced weight loss is often limited in its magnitude and often of short duration, followed by weight regain. On the contrary, bariatric surgery now commonly used in the treatment of severe obesity favors large and sustained weight loss, with resolution or improvement of most obesity-associated comorbidities. The mechanisms of sustained weight loss are not well understood. Whether changes in the various components of energy expenditure favor weight maintenance after bariatric surgery is unclear. While the impact of diet-induced weight loss on energy expenditure has been widely studied and reviewed, the impact of bariatric surgery on total energy expenditure, resting energy expenditure, and diet-induced thermogenesis remains unclear. Here, we review data on energy expenditure after bariatric surgery from animal and human studies. Bariatric surgery results in decreased total energy expenditure, mainly due to reduced resting energy expenditure and explained by a decreased in both fat-free mass and fat mass. Limited data suggest increased diet-induced thermogenesis after gastric bypass, a surgery that results in gut anatomical changes and modified the digestion processes. Physical activity and sustained intakes of dietary protein may be the best strategies available to increase non-resting and then total energy expenditure, as well as to prevent the decline in lean mass and resting energy expenditure.
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Bosy-Westphal A, Braun W, Schautz B, Müller MJ. Issues in characterizing resting energy expenditure in obesity and after weight loss. Front Physiol 2013; 4:47. [PMID: 23532370 PMCID: PMC3607079 DOI: 10.3389/fphys.2013.00047] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Accepted: 02/28/2013] [Indexed: 11/13/2022] Open
Abstract
UNLABELLED Limitations of current methods: Normalization of resting energy expenditure (REE) for body composition using the 2-compartment model fat mass (FM), and fat-free mass (FFM) has inherent limitations for the interpretation of REE and may lead to erroneous conclusions when comparing people with a wide range of adiposity as well as before and after substantial weight loss. EXPERIMENTAL OBJECTIVES We compared different methods of REE normalization: (1) for FFM and FM (2) by the inclusion of %FM as a measure of adiposity and (3) based on organ and tissue masses. RESULTS were compared between healthy subjects with different degrees of adiposity as well as within subject before and after weight loss. RESULTS Normalizing REE from an "REE vs. FFM and FM equation" that (1) was derived in obese participants and applied to lean people or (2) was derived before weight loss and applied after weight loss leads to the erroneous conclusion of a lower metabolic rate (i) in lean persons and (ii) after weight loss. This is revealed by the normalization of REE for organ and tissue masses that was not significantly different between lean and obese or between baseline and after weight loss. There is evidence for an increasing specific metabolic rate of FFM with increasing %FM that could be explained by a higher contribution of liver, kidney and heart mass to FFM in obesity. Using "REE vs. FFM and FM equations" specific for different levels of adiposity (%FM) eliminated differences in REE before and after weight loss in women. CONCLUSION The most established method for normalization of REE based on FFM and FM may lead to spurious conclusions about metabolic rate in obesity and the phenomenon of weight loss-associated adaptive thermogenesis. Using %FM-specific REE prediction from FFM and FM in kg may improve the normalization of REE when subjects with wide differences in %FM are investigated.
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Affiliation(s)
- Anja Bosy-Westphal
- Institut für Humanernährung und Lebensmittelkunde, Christian-Albrechts-Universität zu KielKiel, Germany
- Institut für Ernährungsmedizin, Universität HohenheimStuttgart, Germany
| | - Wiebke Braun
- Institut für Humanernährung und Lebensmittelkunde, Christian-Albrechts-Universität zu KielKiel, Germany
| | - Britta Schautz
- Institut für Humanernährung und Lebensmittelkunde, Christian-Albrechts-Universität zu KielKiel, Germany
| | - Manfred J. Müller
- Institut für Humanernährung und Lebensmittelkunde, Christian-Albrechts-Universität zu KielKiel, Germany
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Bissonnette S, Salem H, Wassef H, Saint-Pierre N, Tardif A, Baass A, Dufour R, Faraj M. Low density lipoprotein delays clearance of triglyceride-rich lipoprotein by human subcutaneous adipose tissue. J Lipid Res 2013; 54:1466-76. [PMID: 23417739 DOI: 10.1194/jlr.p023176] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Delayed clearance of triglyceride-rich lipoprotein (TRL) by white adipose tissue (WAT) promotes hypertriglyceridemia and elevated apoB-lipoproteins, which are primarily in the form of LDL. This study examines whether LDL promotes delayed clearance of TRL by WAT. Following the ingestion of a (13)C-triolein-labeled high-fat meal, obese women with high plasma apoB (> median 0.93 g/l, N = 11, > 98% as IDL/LDL) had delayed clearance of postprandial (13)C-triglyceride and (13)C-NEFA over 6 h compared with controls. AUC6 h of plasma (13)C-triglyceride and (13)C-NEFA correlated with plasma apoB but not with LDL diameter or adipocyte area. There was no group difference in (13)C-triolein oxidation rate, which suggests lower (13)C-NEFA storage in peripheral tissue in women with high apoB. Ex vivo/in vitro plasma apoB correlated negatively with WAT (3)H-lipid following a 4 h incubation of women's WAT with synthetic (3)H-triolein-TRL. LDL-differentiated 3T3-L1 adipocytes had lower (3)H-TRL hydrolysis and (3)H-NEFA storage. Treatment of women's WAT with their own LDL decreased (3)H-TRL hydrolysis and (3)H-NEFA uptake. Finally, LDL, although not an LPL substrate, reduced LPL-mediated (3)H-TRL hydrolysis as did VLDL and HDL. Exposure to LDL decreases TRL clearance by human WAT ex vivo. This may promote production of apoB-lipoproteins and hypertriglyceridemia through a positive-feedback mechanism in vivo.
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Affiliation(s)
- Simon Bissonnette
- Faculty of Medicine, Université de Montréal, Montréal, Québec, Canada
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Wone BWM, Donovan ER, Cushman JC, Hayes JP. Metabolic rates associated with membrane fatty acids in mice selected for increased maximal metabolic rate. Comp Biochem Physiol A Mol Integr Physiol 2013; 165:70-8. [PMID: 23422919 DOI: 10.1016/j.cbpa.2013.02.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2012] [Revised: 02/11/2013] [Accepted: 02/12/2013] [Indexed: 12/19/2022]
Abstract
Aerobic metabolism of vertebrates is linked to membrane fatty acid (FA) composition. Although the membrane pacemaker hypothesis posits that desaturation of FAs accounts for variation in resting or basal metabolic rate (BMR), little is known about the FA profiles that underpin variation in maximal metabolic rate (MMR). We examined membrane FA composition of liver and skeletal muscle in mice after seven generations of selection for increased MMR. In both liver and skeletal muscle, unsaturation index did not differ between control and high-MMR mice. We also examined membrane FA composition at the individual-level of variation. In liver, 18:0, 20:3 n-6, 20:4 n-6, and 22:6 n-3 FAs were significant predictors of MMR. In gastrocnemius muscle, 18:2 n-6, 20:4 n-6, and 22:6 n-3 FAs were significant predictors of MMR. In addition, muscle 16:1 n-7, 18:1 n-9, and 22:5 n-3 FAs were significant predictors of BMR, whereas no liver FAs were significant predictors of BMR. Our findings indicate that (i) individual variation in MMR and BMR appears to be linked to membrane FA composition in the skeletal muscle and liver, and (ii) FAs that differ between selected and control lines are involved in pathways that can affect MMR or BMR.
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Affiliation(s)
- Bernard W M Wone
- Program in Ecology, Evolution, and Conservation Biology, University of Nevada, Reno, NV 89557-0314, USA.
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Müller MJ, Bosy-Westphal A. Adaptive thermogenesis with weight loss in humans. Obesity (Silver Spring) 2013; 21:218-28. [PMID: 23404923 DOI: 10.1002/oby.20027] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Revised: 05/15/2012] [Accepted: 06/28/2012] [Indexed: 01/08/2023]
Abstract
UNLABELLED Adaptive thermogenesis (AT) with weight loss refers to underfeeding-associated fall in resting and non-resting energy expenditure (REE, non-REE); this is independent of body weight and body composition. In humans, the existence of AT was inconsistently shown and its clinical significance has been questioned. OBJECTIVES Discrepant findings are mainly due to different definitions of AT, the use of various and nonstandardized study protocols, and the limits of accuracy of methods to assess energy expenditure. With controlled underfeeding, AT takes more than 2 wk to develop. AT accounts to an average of 0.5 MJ (or 120 kcal) with a considerable between subject variance. DESIGN AND METHODS Low-sympathetic nervous system activity, 3,5,3'-tri-iodothyronine (T3) and leptin are likely to add to AT; however, the kinetic changes of their plasma levels with underfeeding differ from the time course of AT and controlled intervention studies substituting and titrating these hormones are rare in humans. AT in response to underfeeding is independent of thermogenesis in response to either diet or cold. Although fat-free mass (FFM) and, thus, liver, and skeletal muscle are considered as major sites of AT, cold-induced nonshivering thermogenesis relates to the metabolism of brown adipose tissue (BAT). In humans, diet-induced thermogenesis is related to postprandial substrate metabolism of FFM with a questionable role of BAT. Obviously, the REE component of AT differs from and its non-REE component with respect to organ contribution as well as mechanisms. Thus, AT cannot be considered as unique. CONCLUSIONS AT should be characterized based on individual components of daily energy expenditure, detailed body composition analyses, and mathematical modeling. The biological basis of AT as well as the influences of age, sex, obesity, stress, and inflammation remain to be established in humans.
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Affiliation(s)
- M J Müller
- Institut für Humanernährung und Lebensmittelkunde, Christian-Albrechts-Universität zu Kiel, Düsternbrooker Weg 17, 24105 Kiel, Germany.
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Heymsfield SB, Thomas D, Bosy-Westphal A, Shen W, Peterson CM, Müller MJ. Evolving concepts on adjusting human resting energy expenditure measurements for body size. Obes Rev 2012; 13:1001-14. [PMID: 22863371 PMCID: PMC3477241 DOI: 10.1111/j.1467-789x.2012.01019.x] [Citation(s) in RCA: 73] [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] [Indexed: 12/14/2022]
Abstract
Establishing if an adult's resting energy expenditure (REE) is high or low for their body size is a pervasive question in nutrition research. Early workers applied body mass and height as size measures and formulated the Surface Law and Kleiber's Law, although each has limitations when adjusting REE. Body composition methods introduced during the mid-20th century provided a new opportunity to identify metabolically homogeneous 'active' compartments. These compartments all show improved correlations with REE estimates over body mass-height approaches, but collectively share a common limitation: REE-body composition ratios are not 'constant' but vary across men and women and with race, age and body size. The now-accepted alternative to ratio-based norms is to adjust for predictors by applying regression models to calculate 'residuals' that establish if an REE is relatively high or low. The distinguishing feature of statistical REE-body composition models is a 'non-zero' intercept of unknown origin. The recent introduction of imaging methods has allowed development of physiological tissue-organ-based REE prediction models. Herein, we apply these imaging methods to provide a mechanistic explanation, supported by experimental data, for the non-zero intercept phenomenon and, in that context, propose future research directions for establishing between-subject differences in relative energy metabolism.
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Affiliation(s)
- S B Heymsfield
- Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA.
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Konarzewski M, Książek A. Determinants of intra-specific variation in basal metabolic rate. J Comp Physiol B 2012; 183:27-41. [PMID: 22847501 PMCID: PMC3536993 DOI: 10.1007/s00360-012-0698-z] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2011] [Revised: 06/10/2012] [Accepted: 07/13/2012] [Indexed: 12/02/2022]
Abstract
Basal metabolic rate (BMR) provides a widely accepted benchmark of metabolic expenditure for endotherms under laboratory and natural conditions. While most studies examining BMR have concentrated on inter-specific variation, relatively less attention has been paid to the determinants of within-species variation. Even fewer studies have analysed the determinants of within-species BMR variation corrected for the strong influence of body mass by appropriate means (e.g. ANCOVA). Here, we review recent advancements in studies on the quantitative genetics of BMR and organ mass variation, along with their molecular genetics. Next, we decompose BMR variation at the organ, tissue and molecular level. We conclude that within-species variation in BMR and its components have a clear genetic signature, and are functionally linked to key metabolic process at all levels of biological organization. We highlight the need to integrate molecular genetics with conventional metabolic field studies to reveal the adaptive significance of metabolic variation. Since comparing gene expressions inter-specifically is problematic, within-species studies are more likely to inform us about the genetic underpinnings of BMR. We also urge for better integration of animal and medical research on BMR; the latter is quickly advancing thanks to the application of imaging technologies and ‘omics’ studies. We also suggest that much insight on the biochemical and molecular underpinnings of BMR variation can be gained from integrating studies on the mammalian target of rapamycin (mTOR), which appears to be the major regulatory pathway influencing the key molecular components of BMR.
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