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Campellone GA, Easley KA, Jenkins JB, Jean SM. Evaluating the Safety and Efficacy of Capromorelin in Rhesus Macaques ( Macaca mulatta). JOURNAL OF THE AMERICAN ASSOCIATION FOR LABORATORY ANIMAL SCIENCE : JAALAS 2024; 63:268-278. [PMID: 38423529 PMCID: PMC11193426 DOI: 10.30802/aalas-jaalas-23-000010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 06/30/2023] [Accepted: 08/28/2023] [Indexed: 03/02/2024]
Abstract
Nonhuman primates used in biomedical research may experience clinically significant weight loss for a variety of reasons. Episodes of anorexia (complete loss of appetite) or hyporexia (decreased appetite) can result in significant weight loss, potentially altering animal welfare and scientific studies. The FDA has approved several appetite stimulants for use in domestic species, but currently none are approved for use in NHP. Treatment of inappetence and weight loss in NHP often relies on the extralabel use of these compounds. Capromorelin is a ghrelin receptor agonist. As a growth hormone secretagogue, capromorelin increases appetite, leading to weight gain. Studies in several species have shown a positive correlation between capromorelin administration and weight gain; in 2017, an oral solution of capromorelin received FDA approval for use in dogs. We tested this solution in healthy adult rhesus macaques (n = 3 males and 3 females) for its effects on body weight and insulin like growth factor-1 (IGF-1). A control group (n = 2 males and 2 females) was used for comparison. Treated macaques received a 3mg/kg oral dose daily for 7 d. Clinical signs were observed daily. Weights were collected before, during and at the end of treatment. Blood was drawn before, during and after treatment for measurement of IGF-1 levels and standard hematology and biochemistry parameters. Baseline-adjusted mean body weights and IGF-1 levels were significantly higher in treated as compared with control monkeys after 7 d of beginning treatment (body weight of 10.5±0.1kg (mean ± SEM) and 10.1±0.1kg, respectively; IGF-1 of 758±43ng/mL and 639±22ng/mL, respectively). Capromorelin administration was not associated with appreciable changes in hematologic and biochemical values in treated macaques. These findings suggest that capromorelin may be useful for treating inappetence and weight loss in NHP, and based on blood analysis, a 7-d course of treatment does not appear to cause acute toxicity.
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Affiliation(s)
- Gianni A Campellone
- Division of Animal Resources, Emory National primate Research Center, Atlanta, Georgia and
| | - Kirk A Easley
- Department of Biostatistics and Bioinformatics of the Rollins School of Public Health at Emory University, Atlanta, Georgia
| | - Joe B Jenkins
- Division of Animal Resources, Emory National primate Research Center, Atlanta, Georgia and
| | - Sherrie M Jean
- Division of Animal Resources, Emory National primate Research Center, Atlanta, Georgia and
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Kyun S, Kim J, Hwang D, Jang I, Park HY, Lim K. Lactate administration induces skeletal muscle synthesis by influencing Akt/mTOR and MuRF1 in non-trained mice but not in trained mice. Physiol Rep 2024; 12:e15952. [PMID: 38383135 PMCID: PMC10881281 DOI: 10.14814/phy2.15952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 12/26/2023] [Accepted: 12/26/2023] [Indexed: 02/23/2024] Open
Abstract
The perception regarding lactate has changed over the past decades, and some of its physiological roles have gradually been revealed. However, the effects of exogenous lactate on skeletal muscle synthesis remain unclear. This study aimed to confirm the effects of a 5-week lactate administration and post-exercise lactate administration on skeletal muscle synthesis. Thirty-two Institute of Cancer Research mice were randomly assigned to non-trained + placebo, non-trained + lactate, trained + placebo, and trained + lactate groups. Furthermore, 3 g/kg of lactate or an equivalent volume of saline was immediately administered after exercise training (maximum oxygen uptake: 70%). Lactate administration and/or exercise training was performed 5 days/week for 5 weeks. After the experimental period, it was observed that lactate administration tended to elevate skeletal muscle weight, increased protein kinase B (p < 0.05) and mammalian target of rapamycin (p < 0.05) mRNA levels, and decreased muscle ring-finger protein-1 expression (p < 0.05). Lactate administration after exercise training significantly enhanced plantaris muscle weight; however, it had no additional effects on most signaling factors. This study demonstrated that a 5-week lactate administration could stimulate skeletal muscle synthesis, and lactate administration after exercise training may provide additional effects, such as increasing skeletal muscle.
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Affiliation(s)
- Sunghwan Kyun
- Department of Sports Medicine and Science in Graduated School, Konkuk University, Seoul, Korea
| | - Jisu Kim
- Department of Sports Medicine and Science in Graduated School, Konkuk University, Seoul, Korea
- Physical Activity and Performance Institute (PAPI), Konkuk University, Seoul, Korea
| | - Deunsol Hwang
- Department of Sports Medicine and Science in Graduated School, Konkuk University, Seoul, Korea
| | - Inkwon Jang
- Department of Sports Medicine and Science in Graduated School, Konkuk University, Seoul, Korea
| | - Hun-Young Park
- Department of Sports Medicine and Science in Graduated School, Konkuk University, Seoul, Korea
- Physical Activity and Performance Institute (PAPI), Konkuk University, Seoul, Korea
| | - Kiwon Lim
- Department of Sports Medicine and Science in Graduated School, Konkuk University, Seoul, Korea
- Physical Activity and Performance Institute (PAPI), Konkuk University, Seoul, Korea
- Department of Physical Education, Konkuk University, Seoul, Korea
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3
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Tucker JAL, Bornath DPD, McCarthy SF, Hazell TJ. Leptin and energy balance: exploring Leptin's role in the regulation of energy intake and energy expenditure. Nutr Neurosci 2024; 27:87-95. [PMID: 36583502 DOI: 10.1080/1028415x.2022.2161135] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Leptin is a tonic appetite-regulating hormone, which is integral for the long-term regulation of energy balance. The current evidence suggests that the typical orexigenic or anorexigenic response of many of these appetite-regulating hormones, most notably ghrelin and cholecystokinin (CCK), require leptin to function whereas glucagon-like peptide-1 (GLP-1) is required for leptin to function, and these responses are altered when leptin injection or gene therapy is administered in combination with these same hormones or respective agonists. The appetite-regulatory pathway is complex, thus peptide tyrosine tyrosine (PYY), brain-derived neurotrophic factor (BDNF), orexin-A (OXA), and amylin also maintain ties to leptin, however these are less well understood. While reviews to date have focused on the existing relationships between leptin and the various neuropeptide modulators of appetite within the central nervous system (CNS) or it's role in thermogenesis, no review paper has synthesised the information regarding the interactions between appetite-regulating hormones and how leptin as a chronic regulator of energy balance can influence the acute appetite-regulatory response. Current evidence suggests that potential relationships exist between leptin and the circulating peripheral appetite hormones ghrelin, GLP-1, CCK, OXA and amylin to exhibit either synergistic or opposing effects on appetite inhibition. Though more research is warranted, leptin appears to be integral in both energy intake and energy expenditure. More specifically, functional leptin receptors appear to play an essential role in these processes.
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Affiliation(s)
- Jessica A L Tucker
- Department of Kinesiology and Physical Education, Wilfrid Laurier University, Waterloo, Canada
| | - Derek P D Bornath
- Department of Kinesiology and Physical Education, Wilfrid Laurier University, Waterloo, Canada
| | - Seth F McCarthy
- Department of Kinesiology and Physical Education, Wilfrid Laurier University, Waterloo, Canada
| | - Tom J Hazell
- Department of Kinesiology and Physical Education, Wilfrid Laurier University, Waterloo, Canada
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Brooks CN, Wight ME, Azeez OE, Bleich RM, Zwetsloot KA. Growing old together: What we know about the influence of diet and exercise on the aging host's gut microbiome. Front Sports Act Living 2023; 5:1168731. [PMID: 37139301 PMCID: PMC10149677 DOI: 10.3389/fspor.2023.1168731] [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: 02/18/2023] [Accepted: 03/28/2023] [Indexed: 05/05/2023] Open
Abstract
The immune system is critical in defending against infection from pathogenic microorganisms. Individuals with weakened immune systems, such as the elderly, are more susceptible to infections and developing autoimmune and inflammatory diseases. The gut microbiome contains a plethora of bacteria and other microorganisms, which collectively plays a significant role in immune function and homeostasis. Gut microbiota are considered to be highly influential on host health and immune function. Therefore, dysbiosis of the microbiota could be a major contributor to the elevated incidence of multiple age-related pathologies. While there seems to be a general consensus that the composition of gut microbiota changes with age, very little is known about how diet and exercise might influence the aging microbiome. Here, we examine the current state of the literature regarding alterations to the gut microbiome as hosts age, drawing particular attention to the knowledge gaps in addressing how diet and exercise influence the aging microbiome. Further, we will demonstrate the need for more controlled studies to investigate the roles that diet and exercise play driving the composition, diversity, and function of the microbiome in an aging population.
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Affiliation(s)
- Chequita N. Brooks
- Department of Biology, Appalachian State University, Boone, NC, United States
| | - Madeline E. Wight
- Department of Biology, Appalachian State University, Boone, NC, United States
| | - Oluwatobi E. Azeez
- Department of Biology, Appalachian State University, Boone, NC, United States
| | - Rachel M. Bleich
- Department of Biology, Appalachian State University, Boone, NC, United States
- Correspondence: Kevin A. Zwetsloot Rachel M. Bleich
| | - Kevin A. Zwetsloot
- Department of Biology, Appalachian State University, Boone, NC, United States
- Department of Public Health and Exercise Science, Appalachian State University, Boone, NC, United States
- Correspondence: Kevin A. Zwetsloot Rachel M. Bleich
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Unlu Y, Vinales KL, Hollstein T, Chang D, Cabeza de Baca T, Walter M, Krakoff J, Piaggi P. The association between gut hormones and diet-induced metabolic flexibility in metabolically healthy adults. Obesity (Silver Spring) 2023; 31:139-149. [PMID: 36471908 PMCID: PMC9780166 DOI: 10.1002/oby.23584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 08/11/2022] [Accepted: 08/15/2022] [Indexed: 12/12/2022]
Abstract
OBJECTIVE This study investigated whether interindividual variance in diet-induced metabolic flexibility is explained by differences in gut hormone concentrations. METHODS A total of 69 healthy volunteers with normal glucose regulation underwent 24-hour assessments of respiratory quotient (RQ) in a whole-room indirect calorimeter during eucaloric feeding (EBL; 50% carbohydrate, 30% fat) and then, in a crossover design, during 24-hour fasting and three normal-protein (20%) overfeeding diets (200% energy requirements). Metabolic flexibility was defined as the change in 24-hour RQ from EBL during standard (50% carbohydrate), high-fat (60%), and high-carbohydrate (75%) overfeeding diets. Plasma concentrations of glucagon-like peptide-1 (GLP-1) and peptide YY (PYY) after an overnight fast were measured prior to and after each diet. RESULTS Compared with EBL, on average, 24-hour RQ decreased by ~4% during high-fat overfeeding, whereas it increased by ~4% during standard overfeeding and by ~9% during high-carbohydrate overfeeding. During high-carbohydrate overfeeding, but not during any other overfeeding diet or fasting, increased GLP-1 concentration was associated with increased RQ (r = 0.44, p < 0.001), higher/lower carbohydrate/lipid oxidation rates (r = 0.34 and r = -0.51, both p < 0.01), respectively, and increased plasma insulin concentration (r = 0.38, p = 0.02). CONCLUSIONS Increased GLP-1 concentration following high-carbohydrate overfeeding associated with a greater shift to carbohydrate oxidation, suggesting that GLP-1 may be implicated in diet-induced metabolic flexibility to carbohydrate overload.
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Affiliation(s)
- Yigit Unlu
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Phoenix, AZ
| | - Karyne L. Vinales
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Phoenix, AZ
- Endocrinology Division, Medicine Department, Phoenix VA Health Care System, Phoenix, AZ, USA
| | - Tim Hollstein
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Phoenix, AZ
- Division of Endocrinology, Diabetology and Clinical Nutrition, Department of Internal Medicine 1, University of Kiel, Arnold-Heller-Straße 3, Kiel 24105, Germany
| | - Douglas Chang
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Phoenix, AZ
| | - Tomás Cabeza de Baca
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Phoenix, AZ
| | - Mary Walter
- Clinical Core Laboratory, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Jonathan Krakoff
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Phoenix, AZ
| | - Paolo Piaggi
- Obesity and Diabetes Clinical Research Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Phoenix, AZ
- Department of Information Engineering, University of Pisa, Pisa, Italy
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Parikh S, Parikh R, Michael K, Bikovski L, Barnabas G, Mardamshina M, Hemi R, Manich P, Goldstein N, Malcov-Brog H, Ben-Dov T, Glaich O, Liber D, Bornstein Y, Goltseker K, Ben-Bezalel R, Pavlovsky M, Golan T, Spitzer L, Matz H, Gonen P, Percik R, Leibou L, Perluk T, Ast G, Frand J, Brenner R, Ziv T, Khaled M, Ben-Eliyahu S, Barak S, Karnieli-Miller O, Levin E, Gepner Y, Weiss R, Pfluger P, Weller A, Levy C. Food-seeking behavior is triggered by skin ultraviolet exposure in males. Nat Metab 2022; 4:883-900. [PMID: 35817855 PMCID: PMC9314261 DOI: 10.1038/s42255-022-00587-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 05/16/2022] [Indexed: 01/03/2023]
Abstract
Sexual dimorphisms are responsible for profound metabolic differences in health and behavior. Whether males and females react differently to environmental cues, such as solar ultraviolet (UV) exposure, is unknown. Here we show that solar exposure induces food-seeking behavior, food intake, and food-seeking behavior and food intake in men, but not in women, through epidemiological evidence of approximately 3,000 individuals throughout the year. In mice, UVB exposure leads to increased food-seeking behavior, food intake and weight gain, with a sexual dimorphism towards males. In both mice and human males, increased appetite is correlated with elevated levels of circulating ghrelin. Specifically, UVB irradiation leads to p53 transcriptional activation of ghrelin in skin adipocytes, while a conditional p53-knockout in mice abolishes UVB-induced ghrelin expression and food-seeking behavior. In females, estrogen interferes with the p53-chromatin interaction on the ghrelin promoter, thus blocking ghrelin and food-seeking behavior in response to UVB exposure. These results identify the skin as a major mediator of energy homeostasis and may lead to therapeutic opportunities for sex-based treatments of endocrine-related diseases.
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Affiliation(s)
- Shivang Parikh
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Roma Parikh
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Keren Michael
- Department of Human Services, The Max Stern Yezreel Valley Academic College, Yezreel Valley, Israel
| | - Lior Bikovski
- The Myers Neuro-Behavioral Core Facility, Tel Aviv University, Tel Aviv, Israel
- School of Behavioral Sciences, Netanya Academic College, Netanya, Israel
| | - Georgina Barnabas
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Mariya Mardamshina
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Rina Hemi
- Endocrine Service Unit, Sheba Medical Center Hospital, Tel Hashomer, Ramat Gan, Israel
| | - Paulee Manich
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Nir Goldstein
- School of Public Health, Sackler Faculty of Medicine and Sylvan Adams Sports Institute, Tel Aviv University, Tel Aviv, Israel
| | - Hagar Malcov-Brog
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Tom Ben-Dov
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
- Department of Otolaryngology, Head and Neck surgery, Meir Medical Center, Kfar Saba, Israel
| | - Ohad Glaich
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Daphna Liber
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Yael Bornstein
- School of Public Health, Sackler Faculty of Medicine and Sylvan Adams Sports Institute, Tel Aviv University, Tel Aviv, Israel
| | - Koral Goltseker
- Zuckerman Mind Brain Behavior Institute, Howard Hughes Medical Institute and Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA
| | - Roy Ben-Bezalel
- School of Zoology, Faculty of Life Science, Tel Aviv University, Tel Aviv, Israel
| | - Mor Pavlovsky
- Division of Dermatology, Tel Aviv Sourasky (Ichilov) Medical Center, Tel Aviv, Israel
| | - Tamar Golan
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Liron Spitzer
- Division of Dermatology, Tel Aviv Sourasky (Ichilov) Medical Center, Tel Aviv, Israel
| | - Hagit Matz
- Division of Dermatology, Tel Aviv Sourasky (Ichilov) Medical Center, Tel Aviv, Israel
- Phototherapy Unit, Assuta Medical Center, Tel Aviv, Israel
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Pinchas Gonen
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Ruth Percik
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
- Division of Endocrinology, Chaim Sheba Medical Center, Tel Hashomer, Israel
| | - Lior Leibou
- Department of Plastic and Reconstructive Surgery, E. Wolfson Medical Center, Holon, Israel
| | - Tomer Perluk
- Department of Plastic and Reconstructive Surgery, E. Wolfson Medical Center, Holon, Israel
| | - Gil Ast
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Jacob Frand
- Department of Plastic and Reconstructive Surgery, E. Wolfson Medical Center, Holon, Israel
| | - Ronen Brenner
- Institute of Oncology, E. Wolfson Medical Center, Holon, Israel
| | - Tamar Ziv
- The Smoler Proteomics Center, Lorry I. Lokey Interdisciplinary Center for Life Sciences and Engineering, Technion, Haifa, Israel
| | - Mehdi Khaled
- INSERM 1279, Gustave Roussy, Université Paris-Saclay, Villejuif, France
| | - Shamgar Ben-Eliyahu
- School of Psychological Sciences, Tel Aviv University, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Segev Barak
- School of Psychological Sciences, Tel Aviv University, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Orit Karnieli-Miller
- Department of Medical Education, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Eran Levin
- School of Zoology, Faculty of Life Science, Tel Aviv University, Tel Aviv, Israel
| | - Yftach Gepner
- School of Public Health, Sackler Faculty of Medicine and Sylvan Adams Sports Institute, Tel Aviv University, Tel Aviv, Israel
| | - Ram Weiss
- Department of Pediatrics, Ruth Rappaport Children's Hospital, Rambam Medical Center and Technion School of Medicine, Haifa, Israel
| | - Paul Pfluger
- Research Unit Neurobiology of Diabetes, Institute for Diabetes and Obesity, Helmholtz Zentrum München, German Centre for Diabetes Research (DZD), Neuherberg, Germany
| | - Aron Weller
- Department of Psychology and the Gonda Brain Research Center, Bar-Ilan University, Ramat Gan, Israel
| | - Carmit Levy
- Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
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Schab M, Skoczen S. The Role of Nutritional Status, Gastrointestinal Peptides, and Endocannabinoids in the Prognosis and Treatment of Children with Cancer. Int J Mol Sci 2022; 23:5159. [PMID: 35563548 PMCID: PMC9106013 DOI: 10.3390/ijms23095159] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 04/29/2022] [Accepted: 04/29/2022] [Indexed: 12/26/2022] Open
Abstract
Neoplastic diseases in children are the second most frequent cause of death among the young. It is estimated that 400,000 children worldwide will be diagnosed with cancer each year. The nutritional status at diagnosis is a prognostic indicator and influences the treatment tolerance. Both malnutrition and obesity increase the risk of mortality and complications during treatment. It is necessary to constantly search for new factors that impair the nutritional status. The endocannabinoid system (ECS) is a signaling system whose best-known function is regulating energy balance and food intake, but it also plays a role in pain control, embryogenesis, neurogenesis, learning, and the regulation of lipid and glucose metabolism. Its action is multidirectional, and its role is being discovered in an increasing number of diseases. In adults, cannabinoids have been shown to have anti-cancer properties against breast and pancreatic cancer, melanoma, lymphoma, and brain tumors. Data on the importance of both the endocannabinoid system and synthetic cannabinoids are lacking in children with cancer. This review highlights the role of nutritional status in the oncological treatment process, and describes the role of ECS and gastrointestinal peptides in regulating appetite. We also point to the need for research to evaluate the role of the endocannabinoid system in children with cancer, together with a prospective assessment of nutritional status during oncological treatment.
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Affiliation(s)
- Magdalena Schab
- Department of Pediatric Oncology and Hematology, University Children’s Hospital of Krakow, 30-663 Krakow, Poland;
| | - Szymon Skoczen
- Department of Pediatric Oncology and Hematology, University Children’s Hospital of Krakow, 30-663 Krakow, Poland;
- Department of Pediatric Oncology and Hematology, Faculty of Medicine, Jagiellonian University Medical College, 30-663 Krakow, Poland
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8
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Gastrointestinal Hormones, Morphological Characteristics, and Physical Performance in Elite Soccer Players. Int J Sports Physiol Perform 2022; 17:1371-1381. [PMID: 35320775 DOI: 10.1123/ijspp.2021-0484] [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: 10/30/2021] [Revised: 01/05/2022] [Accepted: 01/23/2022] [Indexed: 11/18/2022]
Abstract
PURPOSE To determine the relationship between gastrointestinal hormones (leptin, glucagon-like peptide-1), ghrelin, cholecystokinin, peptide YY, morphological characteristics, and physical performances in elite soccer players. METHODS Q2 Twenty-two elite male soccer players (age = 23.1 [2.7] y, height = 177.0 [0.1] cm, weight = 70.2 [2.9] kg, body mass index = 22.1 [1.8] kg/m2) completed 3-day food records each week during the 5-week training period. Blood samples were drawn after an overnight fast before and after preseason training to assess gastrointestinal hormones (leptin, glucagon-like peptide-1, ghrelin, cholecystokinin, and peptide YY). Continuous analysis of the training load was used during the training period. Preintervention and postintervention tests assessed jumping (countermovement jump), sprinting (10, 20, and 30 m), and endurance fitness (the Yo-Yo Intermittent Recovery Test Level 1 [YYIRT1]) levels. RESULTS Preseason training decreased body mass index (P = .001; effect size [ES] = 0.183) and body fat percentage (P = .001; ES = 0.516). There were increases in countermovement jump (P = .032; ES = 0.215), 20- (P = .016; ES = 0.195) and 30-m sprints (P = .001; ES = 0.188), and YYIRT1 performance (P = .001; ES = 0.9). Levels of cholecystokinin, peptide YY, and ghrelin did not change during preseason training, although changes in leptin (P = .001; ES = 0.41) and glucagon-like peptide-1 levels (P = .039; ES = 0.606) were recorded. Leptinemia correlated with anthropometric parameters (body mass index, r = .77, P = .001; percentage of body fat,r = .67, P = .006) and the total distance covered during the YYIRT1 (r = -.54; P = .03). CONCLUSION Changes in morphological parameters and physical performance in elite-level male soccer players are related to variations in selected gastrointestinal hormones.
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Desdentado L, Navarrete J, Folgado-Alufre M, de Blas A, Navarro-Siurana J, Ponce F, Molinari G, Jimeno-Martínez A, Rupérez AI, Bueno-Lozano G, Cuenca-Royo A, Corbella E, Agüera Z, Baños RM, Álvarez-Pitti J. Are Peripheral Biomarkers Determinants of Eating Styles in Childhood and Adolescence Obesity? A Cross-Sectional Study. Nutrients 2022; 14:305. [PMID: 35057485 PMCID: PMC8780085 DOI: 10.3390/nu14020305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/24/2021] [Accepted: 11/30/2021] [Indexed: 02/04/2023] Open
Abstract
Disturbances in eating behaviors have been widely related to obesity. However, little is known about the role of obesity-related biomarkers in shaping habitual patterns of eating behaviors (i.e., eating styles) in childhood. The objective of the present study was to explore the relationships between several biomarkers crucially involved in obesity (ghrelin, insulin resistance, and leptin/adiponectin ratio) and eating styles in children and adolescents with obesity. Seventy participants aged between 8 and 16 (56.2% men) fulfilled the Spanish version of the Dutch Eating Behavior Questionnaire for Children to measure external, emotional, and restrained eating styles. In addition, concentrations of ghrelin, leptin, adiponectin, insulin, and glucose were obtained through a blood test. Hierarchical multiple regression analyses controlling for age and sex were computed for each eating style. Results indicated that individuals with higher ghrelin concentration levels showed lower scores in restrained eating (β = -0.61, p < 0.001). The total model explained 32% of the variance of the restrained pattern. No other relationships between obesity-related biomarkers and eating behaviors were found. This study highlights that one of the obesity-risk factors, namely lower plasma ghrelin levels, is substantially involved in a well-known maladaptive eating style, restraint eating, in childhood obesity.
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Affiliation(s)
- Lorena Desdentado
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
- Polibienestar Research Institute, University of Valencia, Calle Serpis, 29, 46022 Valencia, Spain; (J.N.); (M.F.-A.); (J.N.-S.)
- Department of Personality, Evaluation, and Psychological Treatments, University of Valencia, Avda. Blasco Ibañez, 21, 46010 Valencia, Spain
| | - Jaime Navarrete
- Polibienestar Research Institute, University of Valencia, Calle Serpis, 29, 46022 Valencia, Spain; (J.N.); (M.F.-A.); (J.N.-S.)
| | - María Folgado-Alufre
- Polibienestar Research Institute, University of Valencia, Calle Serpis, 29, 46022 Valencia, Spain; (J.N.); (M.F.-A.); (J.N.-S.)
- Department of Personality, Evaluation, and Psychological Treatments, University of Valencia, Avda. Blasco Ibañez, 21, 46010 Valencia, Spain
| | - Ana de Blas
- Pediatric Department, Consorcio Hospital General Universitario de Valencia, Avda. Tres Cruces, 2, 46014 Valencia, Spain;
| | - Jéssica Navarro-Siurana
- Polibienestar Research Institute, University of Valencia, Calle Serpis, 29, 46022 Valencia, Spain; (J.N.); (M.F.-A.); (J.N.-S.)
| | - Francisco Ponce
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
- Pediatric Department, Consorcio Hospital General Universitario de Valencia, Avda. Tres Cruces, 2, 46014 Valencia, Spain;
| | - Guadalupe Molinari
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
| | - Andrea Jimeno-Martínez
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
- Growth, Exercise, Nutrition and Development (GENUD) Research Group, Facultad de Ciencias de la Salud, Instituto Agroalimentario de Aragón, Universidad de Zaragoza, Calle Miguel Servet, 177, 50013 Zaragoza, Spain
| | - Azahara I. Rupérez
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
- Growth, Exercise, Nutrition and Development (GENUD) Research Group, Facultad de Ciencias de la Salud, Instituto Agroalimentario de Aragón, Universidad de Zaragoza, Calle Miguel Servet, 177, 50013 Zaragoza, Spain
| | - Gloria Bueno-Lozano
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
- Growth, Exercise, Nutrition and Development (GENUD) Research Group, Facultad de Ciencias de la Salud, Instituto Agroalimentario de Aragón, Universidad de Zaragoza, Calle Miguel Servet, 177, 50013 Zaragoza, Spain
- Paediatric Endocrinology Department, Clinical Hospital Lozano Blesa, Zaragoza, Avda. San Juan Bosco, 50009 Zaragoza, Spain
| | - Aida Cuenca-Royo
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
- Integrative Pharmacology and Systems Neurosciences Research Group, Neurosciences Research Program, Hospital del Mar Medical Research Institute (IMIM), 08003 Barcelona, Spain
| | - Emili Corbella
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
- Cardiovascular Risk Unit, Internal Medicine Department, Bellvitge University Hospital—IDIBELL, Feixa Llarga, s/n, 08907 Barcelona, Spain
| | - Zaida Agüera
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
- Department of Public Health, Mental Health and Perinatal Nursing, Health Sciences Campus Bellvitge, School of Nursing, University of Barcelona, Feixa Llarga, s/n, 08907 Barcelona, Spain
| | - Rosa M. Baños
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
- Polibienestar Research Institute, University of Valencia, Calle Serpis, 29, 46022 Valencia, Spain; (J.N.); (M.F.-A.); (J.N.-S.)
- Department of Personality, Evaluation, and Psychological Treatments, University of Valencia, Avda. Blasco Ibañez, 21, 46010 Valencia, Spain
| | - Julio Álvarez-Pitti
- CIBER Fisiopatología Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Av. Monforte de Lemos, 3-5. Pabellón 11, Planta 0, 28029 Madrid, Spain; (L.D.); (F.P.); (G.M.); (A.J.-M.); (A.I.R.); (G.B.-L.); (A.C.-R.); (E.C.); (Z.A.); (R.M.B.)
- Pediatric Department, Consorcio Hospital General Universitario de Valencia, Avda. Tres Cruces, 2, 46014 Valencia, Spain;
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10
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Fenton JM, King JA, Hoekstra SP, Willis SA, Ogawa T, Goosey-Tolfrey VL. Accentuated early postprandial satiety in people with SCI versus able-bodied controls. Appetite 2021; 167:105628. [PMID: 34389376 DOI: 10.1016/j.appet.2021.105628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 08/03/2021] [Accepted: 08/04/2021] [Indexed: 11/30/2022]
Abstract
In persons with spinal cord injury (SCI), reduced fat-free mass and movement-related energy expenditure increase obesity risk. Although plausible mechanisms exist, it remains unknown whether impaired appetite regulation potentiates obesity risk in SCI. This study compared postprandial responses of appetite-related hormones, appetite perceptions and the sensitivity of appetite to covert preload energy manipulation in persons with SCI and able-bodied (AB) controls. In a counterbalanced order, 12 men with high-level SCI (≥T6 vertebrae) and 12 AB controls completed two trials, consuming covert high-energy (HE; 2513 kJ) and low-energy (LE; 1008 kJ) preloads on separate occasions. Subjective appetite perceptions were assessed at 30 min intervals following preload consumption (up to 150 min) and energy intake was determined from ad libitum test meals. Appetite-related hormone (total PYY, GLP-1 and acylated ghrelin) responses were measured in the HE trial only. Within the early postprandial phase (0-60 min), subjective ratings of fullness (d = 0.83) and satisfaction (d = 0.87) were higher (P ≤ 0.028) in the group with SCI. No group differences in PYY, GLP-1 or acylated ghrelin were detected in a fasted state or postprandially (d ≤ 0.64; p ≥ 0.053). Ad libitum energy intake was lower in the SCI group (1086 vs. 1713 kJ, respectively, d = 1.00; P = 0.020) but no effect of trial (preload) was found. These findings suggest that, following isocaloric preloads, postprandial satiety may be augmented, rather than attenuated, in people with SCI.
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Affiliation(s)
- Jordan M Fenton
- National Centre for Sport and Exercise Medicine, School of Sport, Exercise and Health Sciences, Loughborough University, UK; Peter Harrison Centre for Disability Sport, Loughborough University, UK.
| | - James A King
- National Centre for Sport and Exercise Medicine, School of Sport, Exercise and Health Sciences, Loughborough University, UK; National Institute for Health Research (NIHR) Leicester Biomedical Research Centre, University Hospitals of Leicester NHS Trust and University of Leicester, Leicester, LE5 4PW, UK.
| | - Sven P Hoekstra
- National Centre for Sport and Exercise Medicine, School of Sport, Exercise and Health Sciences, Loughborough University, UK; Peter Harrison Centre for Disability Sport, Loughborough University, UK.
| | - Scott A Willis
- National Centre for Sport and Exercise Medicine, School of Sport, Exercise and Health Sciences, Loughborough University, UK; National Institute for Health Research (NIHR) Leicester Biomedical Research Centre, University Hospitals of Leicester NHS Trust and University of Leicester, Leicester, LE5 4PW, UK.
| | - Takahiro Ogawa
- Department of Rehabilitation Medicine, Wakayama Medical University, Wakayama, Japan.
| | - Victoria L Goosey-Tolfrey
- National Centre for Sport and Exercise Medicine, School of Sport, Exercise and Health Sciences, Loughborough University, UK; Peter Harrison Centre for Disability Sport, Loughborough University, UK.
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11
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Martínez-Gómez MG, Roberts BM. Metabolic Adaptations to Weight Loss: A Brief Review. J Strength Cond Res 2021; 36:2970-2981. [PMID: 33677461 DOI: 10.1519/jsc.0000000000003991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
ABSTRACT Martínez-Gómez, MG and Roberts, BM. Metabolic adaptations to weight loss: A brief review. J Strength Cond Res XX(X): 000-000, 2021-As the scientific literature has continuously shown, body mass loss attempts do not always follow a linear fashion nor always go as expected even when the intervention is calculated with precise tools. One of the main reasons why this tends to happen relies on our body's biological drive to regain the body mass we lose to survive. This phenomenon has been referred to as "metabolic adaptation" many times in the literature and plays a very relevant role in the management of obesity and human weight loss. This review will provide insights into some of the theoretical models for the etiology of metabolic adaptation as well as a quick look into the physiological and endocrine mechanisms that underlie it. Nutritional strategies and dietetic tools are thus necessary to confront these so-called adaptations to body mass loss. Among some of these strategies, we can highlight increasing protein needs, opting for high-fiber foods or programming-controlled diet refeeds, and diet breaks over a large body mass loss phase. Outside the nutritional aspects, it might be wise to increase the physical activity and thus the energy flux of an individual when possible to maintain diet-induced body mass loss in the long term. This review will examine these protocols and their viability in the context of adherence and sustainability for the individual toward successful body mass loss.
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Affiliation(s)
- Mario G Martínez-Gómez
- CarloSportNutrition, Spain; and University of Alabama at Birmingham, Birmingham, Alabama
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12
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Yeung C, Shi IQ, Sung HK. Physiological Responses of Post-Dietary Effects: Lessons from Pre-Clinical and Clinical Studies. Metabolites 2021; 11:metabo11020062. [PMID: 33498462 PMCID: PMC7909542 DOI: 10.3390/metabo11020062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/17/2021] [Accepted: 01/18/2021] [Indexed: 02/07/2023] Open
Abstract
Dieting regimens such as calorie restriction (CR) are among the most commonly practiced interventions for weight management and metabolic abnormalities. Due to its independence from pharmacological agents and considerable flexibility in regimens, many individuals turn to dieting as a form of mitigation and maintenance of metabolic health. While metabolic benefits of CR have been widely studied, weight loss maintenance and metabolic benefits are reported to be lost overtime when the diet regimen has been terminated—referred to as post-dietary effects. Specifically, due to the challenges of long-term adherence and compliance to dieting, post-dietary repercussions such as body weight regain and loss of metabolic benefits pose as major factors in the efficacy of CR. Intermittent fasting (IF) regimens, which are defined by periodic energy restriction, have been deemed as more flexible, compliant, and easily adapted diet interventions that result in many metabolic benefits which resemble conventional CR diets. Many individuals find that IF regimens are easier to adhere to, resulting in fewer post-dietary effects; therefore, IF may be a more effective intervention. Unfortunately, there is a severe gap in current research regarding IF post-dietary effects. We recognize the importance of understanding the sustainability of dieting; as such, we will review the known physiological responses of CR post-dietary effects and its potential mechanisms through synthesizing lessons from both pre-clinical and clinical studies. This review aims to provide insight from a translational medicine perspective to allow for the development of more practical and effective diet interventions. We suggest more flexible and easily practiced dieting regimens such as IF due to its more adaptable and practical nature.
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Affiliation(s)
- Christy Yeung
- Translational Medicine Program, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; (C.Y.); (I.Q.S.)
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Irisa Qianwen Shi
- Translational Medicine Program, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; (C.Y.); (I.Q.S.)
| | - Hoon-Ki Sung
- Translational Medicine Program, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada; (C.Y.); (I.Q.S.)
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON M5S 1A8, Canada
- Correspondence:
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13
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Schiller M, Ben-Shaanan TL, Rolls A. Neuronal regulation of immunity: why, how and where? Nat Rev Immunol 2021; 21:20-36. [PMID: 32811994 DOI: 10.1038/s41577-020-0387-1] [Citation(s) in RCA: 90] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/18/2020] [Indexed: 02/07/2023]
Abstract
Neuroimmunology is one of the fastest-growing fields in the life sciences, and for good reason; it fills the gap between two principal systems of the organism, the nervous system and the immune system. Although both systems affect each other through bidirectional interactions, we focus here on one direction - the effects of the nervous system on immunity. First, we ask why is it beneficial to allow the nervous system any control over immunity? We evaluate the potential benefits to the immune system that arise by taking advantage of some of the brain's unique features, such as its capacity to integrate and synchronize physiological functions, its predictive capacity and its speed of response. Second, we explore how the brain communicates with the peripheral immune system, with a focus on the endocrine, sympathetic, parasympathetic, sensory and meningeal lymphatic systems. Finally, we examine where in the brain this immune information is processed and regulated. We chart a partial map of brain regions that may be relevant for brain-immune system communication, our goal being to introduce a conceptual framework for formulating new hypotheses to study these interactions.
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Affiliation(s)
- Maya Schiller
- Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Tamar L Ben-Shaanan
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA, USA
- Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA, USA
| | - Asya Rolls
- Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel.
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14
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O'Connor D, Pang M, Castelnuovo G, Finlayson G, Blaak E, Gibbons C, Navas-Carretero S, Almiron-Roig E, Harrold J, Raben A, Martinez JA. A rational review on the effects of sweeteners and sweetness enhancers on appetite, food reward and metabolic/adiposity outcomes in adults. Food Funct 2020; 12:442-465. [PMID: 33325948 DOI: 10.1039/d0fo02424d] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Numerous strategies have been investigated to overcome the excessive weight gain that accompanies a chronic positive energy balance. Most approaches focus on a reduction of energy intake and the improvement of lifestyle habits. The use of high intensity artificial sweeteners, also known as non-caloric sweeteners (NCS), as sugar substitutes in foods and beverages, is rapidly developing. NCS are commonly defined as molecules with a sweetness profile of 30 times higher or more that of sucrose, scarcely contributing to the individual's net energy intake as they are hardly metabolized. The purpose of this review is first, to assess the impact of NCS on eating behaviour, including subjective appetite, food intake, food reward and sensory stimulation; and secondly, to assess the metabolic impact of NCS on body weight regulation, glucose homeostasis and gut health. The evidence reviewed suggests that while some sweeteners have the potential to increase subjective appetite, these effects do not translate in changes in food intake. This is supported by a large body of empirical evidence advocating that the use of NCS facilitates weight management when used alongside other weight management strategies. On the other hand, although NCS are very unlikely to impair insulin metabolism and glycaemic control, some studies suggest that NCS could have putatively undesirable effects, through various indirect mechanisms, on body weight, glycemia, adipogenesis and the gut microbiota; however there is insufficient evidence to determine the degree of such effects. Overall, the available data suggests that NCS can be used to facilitate a reduction in dietary energy content without significant negative effects on food intake behaviour or body metabolism, which would support their potential role in the prevention of obesity as a complementary strategy to other weight management approaches. More research is needed to determine the impact of NCS on metabolic health, in particular gut microbiota.
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Affiliation(s)
- Dominic O'Connor
- Biopsychology Group, Institute of Psychological Sciences, University of Leeds, Leeds, UK
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15
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Krishnan S, Adams SH, Witbracht MG, Woodhouse LR, Piccolo BD, Thomas AP, Souza EC, Horn WF, Gertz ER, Van Loan MD, Keim NL. Weight Loss, but Not Dairy Composition of Diet, Moderately Affects Satiety and Postprandial Gut Hormone Patterns in Adults. J Nutr 2020; 151:245-254. [PMID: 33245130 PMCID: PMC8096231 DOI: 10.1093/jn/nxaa327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 01/28/2020] [Accepted: 10/05/2020] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Inclusion of dairy in diet patterns has been shown to have mixed effects on weight loss. A prevailing hypothesis is that dairy improves weight loss by influencing endocrine systems associated with satiety and food intake regulation. OBJECTIVES The objective of the current study was to evaluate the effect of weight loss with or without adequate dietary dairy on subjective and objective appetitive measures. METHODS Men and women who were habitual low dairy consumers (n = 65, 20-50 y) participated in a 12-wk randomized controlled feeding weight loss trial. During the 12-wk intervention, a low-dairy (<1 serving dairy/d) was compared with an adequate-dairy (3-4 servings dairy/d) diet, both with a 500-kcal deficit/d. Test days, before and at the end of the intervention, began with 2 fasting blood draws and visual analog scale (VAS) measures, followed by a standard breakfast (25% of prescribed restricted calories), 5 postbreakfast blood draws and VASs, a standard lunch (40% of restricted energy amount), and 12 postlunch blood draws and VASs. Blood samples were used for satiety hormone measurements. On a separate day when matching standard meals were consumed, an ad libitum buffet meal was provided as dinner, at a self-selected time. Meal duration and intermeal interval were recorded. RESULTS Weight loss (-6.1 kg), irrespective of dairy, resulted in reduced fasting insulin (-20%) and leptin (-25%), and increased fasting acylated ghrelin (+25%) and VAS desire to eat (+18%) (P < 0.05). There were no effects of dairy on objective or subjective satiety measures. Weight loss marginally reduced the intermeal interval (289 min compared with 276 min, P = 0.059) between lunch and the ad libitum buffet. CONCLUSIONS These results do not support the hypothesis that inclusion of dairy in long-term dietary patterns influences appetite during weight loss. Weight loss per se has a modest impact on select systems that regulate hunger and satiety.This trial was registered at clinicaltrials.gov as NCT00858312.
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Affiliation(s)
- Sridevi Krishnan
- Department of Nutrition, University of California, Davis, Davis, CA, USA
| | - Sean H Adams
- Present address for SHA: Department of Surgery and Center for Alimentary and Metabolic Science, UC Davis School of Medicine, Sacramento, CA
| | - Megan G Witbracht
- Present address for MGW: Institute for Memory Impairments and Neurological Disorders, University of California Irvine, Irvine, CA
| | - Leslie R Woodhouse
- Western Human Nutrition Research Center, USDA Agricultural Research Service, Davis, CA, USA
| | - Brian D Piccolo
- Present address for BDP: Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, AR
| | - Anthony P Thomas
- Present address for APT: Jarrow Formulas, Los Angeles, CA. Present address for ECS: Medical Center, University of California Davis, Davis, CA
| | - Elaine C Souza
- Western Human Nutrition Research Center, USDA Agricultural Research Service, Davis, CA, USA
| | - William F Horn
- Western Human Nutrition Research Center, USDA Agricultural Research Service, Davis, CA, USA
| | - Erik R Gertz
- Western Human Nutrition Research Center, USDA Agricultural Research Service, Davis, CA, USA
| | - Marta D Van Loan
- Department of Nutrition, University of California, Davis, Davis, CA, USA,Western Human Nutrition Research Center, USDA Agricultural Research Service, Davis, CA, USA
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16
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Lafferty RA, Tanday N, Flatt PR, Irwin N. Generation and characterisation of C-terminally stabilised PYY molecules with potential in vivo NPYR2 activity. Metabolism 2020; 111:154339. [PMID: 32777442 DOI: 10.1016/j.metabol.2020.154339] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/09/2020] [Accepted: 07/30/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND Activation of neuropeptide Y2 receptors (NPYR2) by the N-terminally truncated, dipeptidyl peptidase-4 (DPP-4) generated, Peptide YY (PYY) metabolite, namely PYY(3-36), results in satiating actions. However, PYY(3-36) is also subject to C-terminal enzymatic cleavage, which annuls anorectic effects. METHODS Substitution of l-Arg35 with d-Arg35 in the DPP-4 stable sea lamprey PYY(1-36) peptide imparts full C-terminal stability. In the current study, we have taken this molecule and introduced DPP-4 susceptibility by Iso3 substitution. RESULTS As expected, [Iso3]sea lamprey PYY(1-36) and [Iso3](d-Arg35)sea lamprey PYY(1-36) were N-terminally degraded to respective PYY(3-36) metabolites in plasma. Only [Iso3](d-Arg35)sea lamprey PYY(1-36) was C-terminally stable. Both peptides possessed similar insulinostatic and anti-apoptotic biological actions to native PYY(1-36) in beta-cells. Unlike native PYY(1-36) and [Iso3](d-Arg35)sea lamprey PYY(1-36), [Iso3]sea lamprey PYY(1-36) displayed some proliferative actions in Npyr1 knockout beta-cells. In addition, [Iso3]sea lamprey PYY(1-36) induced more rapid NPYR2-dependent appetite suppressive effects in mice than its C-terminally stable counterpart. Twice daily administration of either peptide to high fat fed (HFF) mice resulted in significant body weight reduction and improvements in circulating triglyceride levels. [Iso3]sea lamprey PYY(1-36) treatment also prevented elevations in glucagon. Both peptides, and especially [Iso3]sea lamprey PYY(1-36), improved glucose tolerance. The treatment interventions also partially reversed the deleterious effects of sustained high fat feeding on pancreatic islet morphology. CONCLUSION The present study confirms that sustained NPYR2 receptor activation by [Iso3](d-Arg35)sea lamprey induced significant weight lowering actions. However, identifiable benefits of this peptide over [Iso3]sea lamprey PYY(1-36), which was not protected against C-terminal degradation, were not pronounced.
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Affiliation(s)
- Ryan A Lafferty
- SAAD Centre for Pharmacy and Diabetes, University of Ulster, Coleraine, Northern Ireland BT52 1SA, UK
| | - Neil Tanday
- SAAD Centre for Pharmacy and Diabetes, University of Ulster, Coleraine, Northern Ireland BT52 1SA, UK
| | - Peter R Flatt
- SAAD Centre for Pharmacy and Diabetes, University of Ulster, Coleraine, Northern Ireland BT52 1SA, UK
| | - Nigel Irwin
- SAAD Centre for Pharmacy and Diabetes, University of Ulster, Coleraine, Northern Ireland BT52 1SA, UK.
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17
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A Study on the Immunohistochemical Expressions of Leptin and Leptin Receptor in Clear Cell Renal Cell Carcinoma. BIOMED RESEARCH INTERNATIONAL 2020; 2020:3682086. [PMID: 32802842 PMCID: PMC7424391 DOI: 10.1155/2020/3682086] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Accepted: 06/22/2020] [Indexed: 12/17/2022]
Abstract
Background The mechanisms that link obesity and cancer development are not well-defined. Investigation of leptin and leptin receptor expressions may help define some of the mechanisms. These proteins are known for associating with the immune response, angiogenesis and, signalling pathways such as JAK2/STAT3, PI3K, and AKT pathways. Tissue proteins can be easily detected with immunohistochemistry (IHC), a technique widely used both in diagnostic and research laboratories. The identification of altered levels of leptin and leptin receptor proteins in tumour tissues may lead to targeted treatment for cancer. Objective The objective of this study was to use IHC to compare leptin and leptin receptor expressions in clear cell renal cell carcinomas (ccRCC) in non-obese and obese patients to determine the association between these proteins with the clinicopathological features and prognosis of ccRCC. Patients and Methods. The study involved 60 patients who underwent nephrectomy of which 34 were obese, as assessed using body mass index (BMI). Nephrectomy samples provided tissues of ccRCC and adjacent non-cancerous kidney. The intensity and localization of leptin and leptin receptor protein expressions were evaluated using IHC and correlated with clinicopathological features and clinical outcomes. Aperio ImageScope morphometry and digital pathology were applied to assess the IHC results. The chi-square test was used to determine if there was any significant association between the proteins and the clinicopathological features. The Kaplan-Meier test was used to determine the overall survival, disease-free survival, and recurrence-free survival. A value of p < 0.05 was considered significant. Results There was neither significant difference in the overall cellular and nuclear expressions of leptin and leptin receptor between non-cancerous kidney and ccRCC tissues nor in non-obese and obese individuals with ccRCC. Conclusion In this present study, it was revealed that leptin and leptin receptor were not associated with tumour characteristics and progression of ccRCC patients. Interestingly, nuclear expression of leptin was significantly associated with overall survival. However, the significance of these proteins as biomarkers in other RCC histotypes is still unclear.
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18
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Kumar U, Singh S. Role of Somatostatin in the Regulation of Central and Peripheral Factors of Satiety and Obesity. Int J Mol Sci 2020; 21:ijms21072568. [PMID: 32272767 PMCID: PMC7177963 DOI: 10.3390/ijms21072568] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/29/2020] [Accepted: 04/02/2020] [Indexed: 02/06/2023] Open
Abstract
Obesity is one of the major social and health problems globally and often associated with various other pathological conditions. In addition to unregulated eating behaviour, circulating peptide-mediated hormonal secretion and signaling pathways play a critical role in food intake induced obesity. Amongst the many peptides involved in the regulation of food-seeking behaviour, somatostatin (SST) is the one which plays a determinant role in the complex process of appetite. SST is involved in the regulation of release and secretion of other peptides, neuronal integrity, and hormonal regulation. Based on past and recent studies, SST might serve as a bridge between central and peripheral tissues with a significant impact on obesity-associated with food intake behaviour and energy expenditure. Here, we present a comprehensive review describing the role of SST in the modulation of multiple central and peripheral signaling molecules. In addition, we highlight recent progress and contribution of SST and its receptors in food-seeking behaviour, obesity (orexigenic), and satiety (anorexigenic) associated pathways and mechanism.
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English A, Irwin N. Nonclassical Islet Peptides: Pancreatic and Extrapancreatic Actions. CLINICAL MEDICINE INSIGHTS-ENDOCRINOLOGY AND DIABETES 2019; 12:1179551419888871. [PMID: 32425629 PMCID: PMC7216561 DOI: 10.1177/1179551419888871] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 10/21/2019] [Indexed: 02/06/2023]
Abstract
The pancreas has physiologically important endocrine and exocrine functions; secreting enzymes into the small intestine to aid digestion and releasing multiple peptide hormones via the islets of Langerhans to regulate glucose metabolism, respectively. Insulin and glucagon, in combination with ghrelin, pancreatic polypeptide and somatostatin, are the main classical islet peptides critical for the maintenance of blood glucose. However, pancreatic islets also synthesis numerous ‘nonclassical’ peptides that have recently been demonstrated to exert fundamental effects on overall islet function and metabolism. As such, insights into the physiological relevance of these nonclassical peptides have shown impact on glucose metabolism, insulin action, cell survival, weight loss, and energy expenditure. This review will focus on the role of individual nonclassical islet peptides to stimulate pancreatic islet secretions as well as regulate metabolism. In addition, the more recognised actions of these peptides on satiety and energy regulation will also be considered. Furthermore, recent advances in the field of peptide therapeutics and obesity-diabetes have focused on the benefits of simultaneously targeting several hormone receptor signalling cascades. The potential for nonclassical islet hormones within such combinational approaches will also be discussed.
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Affiliation(s)
- Andrew English
- School of Pharmacy and Pharmaceutical Sciences, Ulster University, Coleraine, Northern Ireland, UK
| | - Nigel Irwin
- School of Pharmacy and Pharmaceutical Sciences, Ulster University, Coleraine, Northern Ireland, UK
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Bradford B, Cronin R, McKinlay C, Thompson J, McCowan L. Maternally perceived fetal movement patterns: The influence of body mass index. Early Hum Dev 2019; 140:104922. [PMID: 31739267 DOI: 10.1016/j.earlhumdev.2019.104922] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 10/06/2019] [Accepted: 10/26/2019] [Indexed: 01/27/2023]
Abstract
BACKGROUND Maternal reports of decreased fetal movements are associated with adverse pregnancy outcome, but there are conflicting data about perception of fetal movements in women with obesity. AIM To compare perceived fetal movements in women with obesity (body mass index [BMI] ≥30 kg/m2) and women with normal BMI (<25 kg/m2). MATERIAL AND METHODS Data from two separate pregnancy studies were used for this analysis; the Healthy Mums and Babies (HUMBA) trial, which recruited women with obesity and the Multicentre Stillbirth Study (MCSS), which recruited women from a general obstetric population. Fetal movement data were collected using identical interviewer-administered questionnaire in each study. We compared fetal movement strength, frequency and pattern between HUMBA and MCSS women with obesity and MCSS women with normal BMI. RESULTS Participants were 233 women with obesity and 149 with normal BMI. Mean (SD) gestation at interview was similar between groups (36.9 [2.2] vs 36.6 [0.9], P = 0.06). Perceived fetal movement strength and frequency did not differ between groups. In both women with obesity and normal BMI, a diurnal fetal movement pattern was present, with the majority reporting strong or moderate movements in the evening (88.7% vs 99.3%) and at night-time (92.1% vs 93.1%). Women with obesity, were more likely to report strong fetal movements when hungry (29.1% vs 17.7%, P = 0.001) and quiet fetal movements after eating (47.4% vs 32.0%, P = 0.001). CONCLUSIONS In women with obesity compared to normal BMI, strength and frequency of fetal movements were similar, although patterns were altered in relation to maternal meals.
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Affiliation(s)
- Billie Bradford
- Department of Obstetrics and Gynaecology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand.
| | - Robin Cronin
- Department of Obstetrics and Gynaecology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Christopher McKinlay
- Liggins Institute, University of Auckland, Auckland, New Zealand; Kids First Neonatal Care, Counties Manukau Health, Auckland, New Zealand
| | - John Thompson
- Department of Obstetrics and Gynaecology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand; Department of Paediatrics: Child and Youth Health, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Lesley McCowan
- Department of Obstetrics and Gynaecology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
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Skinner JA, Garg ML, Dayas CV, Burrows TL. Is weight status associated with peripheral levels of oxytocin? A pilot study in healthy women. Physiol Behav 2019; 212:112684. [PMID: 31629767 DOI: 10.1016/j.physbeh.2019.112684] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 09/09/2019] [Accepted: 09/16/2019] [Indexed: 12/13/2022]
Abstract
The neuropeptide oxytocin is best known for its role during parturition and the milk-let down reflex. Recent evidence identifies a role for oxytocin in eating behaviour. After oxytocin administration, caloric intake is reduced with stronger inhibitory effects in individuals with obesity. Whether the experience of visual food cues affects secretion or circulating levels of oxytocin is unknown. This pilot study had three aims: 1) to measure fasting appetite hormones with a focus on plasma oxytocin concentrations; 2) determine whether healthy vs. hyperpalatable visual food cues differentially altered plasma oxytocin; and 3) assess whether appetite hormone responses to healthy vs. hyperpalatable food images depended on weight or food addiction status. Eighteen healthy women of varying weight status, with/without self-reported food addiction were recruited. Study participants completed a set of standardised questionnaires, including Yale Food Addiction Scale, and attended a one-off experimental session. Blood was collected before and after viewing two sets of food images (healthy and hyperpalatable foods). Participants were randomly allocated in a crossover design to view either healthy images or hyperpalatable foods first. A positive correlation between BMI and plasma oxytocin was found (r2 = 0.32, p = 0.021) at baseline. Oxytocin levels were higher, and cholecystokinin levels lower, in food addicted (n = 6) vs. non-food addicted females (p = 0.015 and p<0.001, respectively). There were no significant changes (p>0.05) in plasma oxytocin levels in response to either healthy or hyperpalatable food images. Given that endogenous oxytocin administration tends to suppress eating behaviour; these data indicate that oxytocin receptor desensitization or oxytocin resistance may be important factors in the pathogenesis of obesity and food addiction. However, further studies in larger samples are needed to determine if peripheral oxytocin is responsive to visual food cues.
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Affiliation(s)
- Janelle A Skinner
- Nutrition and Dietetics, School of Health Sciences, Faculty of Health and Medicine, University of Newcastle, Callaghan NSW 2308, Australia; Priority Research Centre for Physical Activity and Nutrition, University of Newcastle, Callaghan NSW 2308, Australia
| | - Manohar L Garg
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan NSW 2308, Australia
| | - Christopher V Dayas
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, University of Newcastle, Callaghan NSW 2308, Australia
| | - Tracy L Burrows
- Nutrition and Dietetics, School of Health Sciences, Faculty of Health and Medicine, University of Newcastle, Callaghan NSW 2308, Australia; Priority Research Centre for Physical Activity and Nutrition, University of Newcastle, Callaghan NSW 2308, Australia.
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Nolde JM, Laupenmühlen J, Al-Zubaidi A, Heldmann M, Jauch-Chara K, Münte TF. Modulation of brain activity by hormonal factors in the context of ingestive behaviour. Metabolism 2019; 99:11-18. [PMID: 31271805 DOI: 10.1016/j.metabol.2019.06.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 06/24/2019] [Accepted: 06/26/2019] [Indexed: 01/01/2023]
Abstract
INTRODUCTION Metabolic and hormonal signals have been shown to be associated with brain activity in the context of ingestive behaviour. However, this has mostly been seen in studies using external administration of hormones or glucose. We therefore studied endocrine-brain interaction in a physiological setting with hormone levels determined by metabolic conditions such as normal food intake vs. prolonged fasting. METHODS 24 healthy, normal weight men participated in two sessions, one involving a 38-hour fasting period and one a non-fasting control condition with standardized meals. Functional magnetic resonance imaging was performed at the end of the experiment with participants being required to rate pictures of food. Brain activation was compared between conditions in predefined regions of interest (ROIs). Multiple blood samples were taken to determine levels of insulin, C-peptide, cortisol, ACTH, glucose and adiponectin. These were used as a predictor variable in a regression analysis on brain activations in the different ROIs. RESULTS Food pictures were rated as more desirable in the fasting condition. Univariate analysis of ROI activations revealed mainly effects of food rating and no significant effects of the metabolic state. Multiple regression analysis revealed associations between orbitofrontal cortex activation and blood glucose in the non-fasting condition. In the fasting condition adiponectin was associated with the signal from the caudate nucleus and insulin and C-peptide were associated with functional activity of orbitofrontal regions. DISCUSSION Associations of endocrine signals and functional neural regions could be demonstrated in a realistic setting without external administration of hormones. As the current approach was correlational, further studies need to address the causal role of hormonal signals.
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Affiliation(s)
- Janis Marc Nolde
- Department of Neurology, University of Lübeck, Ratzeburger Allee 160, 23562 Lübeck, Germany.
| | - Jana Laupenmühlen
- Department of Psychiatry, University of Lübeck, Ratzeburger Allee 160, 23562 Lübeck, Germany
| | - Arkan Al-Zubaidi
- Department of Neurology, University of Lübeck, Ratzeburger Allee 160, 23562 Lübeck, Germany
| | - Marcus Heldmann
- Department of Neurology, University of Lübeck, Ratzeburger Allee 160, 23562 Lübeck, Germany; Institute of Psychology II, University of Lübeck, Ratzeburger Allee 160, 23562 Lübeck, Germany.
| | - Kamila Jauch-Chara
- Department of Psychiatry and Psychotherapy, Christian-Albrechts-University, Niemannsweg 147, 24105 Kiel, Germany
| | - Thomas F Münte
- Department of Neurology, University of Lübeck, Ratzeburger Allee 160, 23562 Lübeck, Germany; Institute of Psychology II, University of Lübeck, Ratzeburger Allee 160, 23562 Lübeck, Germany.
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Vedel L, Nøhr AC, Gloriam DE, Bräuner-Osborne H. Pharmacology and function of the orphan GPR139 G protein-coupled receptor. Basic Clin Pharmacol Toxicol 2019; 126 Suppl 6:35-46. [PMID: 31132229 PMCID: PMC7318219 DOI: 10.1111/bcpt.13263] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 05/21/2019] [Indexed: 12/17/2022]
Abstract
G protein-coupled receptors (GPCRs) constitute the largest family of receptors and membrane proteins in the human genome with ~800 members of which half are olfactory. GPCRs are activated by a very broad range of endogenous signalling molecules and are involved in a plethora of physiological functions. All GPCRs contain a transmembrane domain, consisting of a bundle of seven α-helices spanning the cell membrane, and forming the majority of the known ortho- or allosteric ligand binding sites. Due to their many physiological functions and the accessible and druggable transmembrane pocket, GPCRs constitute the largest family of drug targets mediating the actions of 34% of currently marketed drugs. GPCRs activate one or more of the four G protein families (Gq/11 , Gi/o , Gs and G12/13 ) and/or ß-arrestin. About a third of the non-olfactory GPCRs are referred to as orphan receptors which means that their endogenous agonist(s) have not yet been found or firmly established. In this MiniReview, we focus on the orphan GPR139 receptor, for which the aromatic amino acids L-Trp and L-Phe as well as ACTH/α-MSH-related peptides have been proposed as endogenous agonists. GPR139 has been reported to activate several G protein pathways of which Gq/11 is the primary one. The receptor shows the highest expression in the striatum, thalamus, hypothalamus, pituitary and habenula of the human, rat and mouse CNS. We review the surrogate agonists and antagonists that have been published as well as the agonist pharmacophore and binding site. Finally, the putative physiological functions and therapeutic potential are outlined.
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Affiliation(s)
- Line Vedel
- Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Anne Cathrine Nøhr
- Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - David E Gloriam
- Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Hans Bräuner-Osborne
- Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
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Nolde JM, Laupenmühlen J, Al-Zubaidi A, Heldmann M, Münte TF, Jauch-Chara K. Endocrine responses and food intake in fasted individuals under the influence of glucose ingestion. PLoS One 2019; 14:e0211514. [PMID: 30682147 PMCID: PMC6347228 DOI: 10.1371/journal.pone.0211514] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 01/15/2019] [Indexed: 02/06/2023] Open
Abstract
Introduction Different metabolic conditions can affect what and how much we eat. Hormones of glucose metabolism and adipokines such as adiponectin take part in the control of these decisions and energy balance of the body. However, a comprehensive understanding of how these endocrine and metabolic factors influence food intake has not been reached. We hypothesised that the amount of food a person consumes differs substantially after a fasting period even after the energy deficit was partially removed by glucose ingestion and endocrine signals like insulin and C-peptide indicated a high glucose metabolic status. Furthermore, the macronutrient composition of the consumed food and a possible association with adiponectin under the influence of glucose ingestion was assessed. Methods In a within-subject design, 24 healthy males participated in both a fasting (42 h) and control (non-fasting) condition. A total of 20 blood samples from each subject were collected during each condition to assess serum levels of adiponectin, insulin, C-peptide, cortisol and ACTH. At the end of each condition food intake was measured with an ad libitum buffet after the acute energy deficit was compensated using a carbohydrate-rich drink. Results The total amount of caloric intake and single macronutrients was higher after the fasting intervention after replenishment with glucose. All recorded hormone levels, except for adiponectin, were significantly different for at least one of the study intervals. The relative proportions of the macronutrient composition of the consumed food were stable in both conditions under the influence of glucose ingestion. In the non-fasting condition, the relative amount of protein intake correlated with adiponectin levels during the experiment. Discussion and conclusion An anabolic glucose metabolism after glucose ingestion following a fasting intervention did not even out energy ingestion compared to a control group with regular food intake and glucose ingestion. Anorexigenic hormones like insulin in this context were not able despite higher levels than in the control condition to ameliorate the drive for food intake to normal or near normal levels. Relative macronutrient intake remains stable under these varying metabolic conditions and glucose influence. Serum adiponectin levels showed a positive association with the relative protein intake in the non-fasting condition under the influence of glucose although adiponectin levels overall did not differ in between the conditions.
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Affiliation(s)
- Janis Marc Nolde
- Department of Neurology, University of Lübeck, Lübeck, Germany
- * E-mail: (JMN); (KJ-C)
| | | | | | - Marcus Heldmann
- Department of Neurology, University of Lübeck, Lübeck, Germany
| | - Thomas F. Münte
- Department of Neurology, University of Lübeck, Lübeck, Germany
| | - Kamila Jauch-Chara
- Department of Psychiatry, University of Kiel, Kiel, Germany
- * E-mail: (JMN); (KJ-C)
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Petkus DL, Murray-Kolb LE, De Souza MJ. The Unexplored Crossroads of the Female Athlete Triad and Iron Deficiency: A Narrative Review. Sports Med 2018; 47:1721-1737. [PMID: 28290159 DOI: 10.1007/s40279-017-0706-2] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Despite the severity and prevalence of iron deficiency in exercising women, few published reports have explored how iron deficiency interacts with another prevalent and severe condition in exercising women: the 'female athlete triad.' This review aims to describe how iron deficiency may interact with each component of the female athlete triad, that is, energy status, reproductive function, and bone health. The effects of iron deficiency on energy status are discussed in regards to thyroid function, metabolic fuel availability, eating behaviors, and energy expenditure. The interactions between iron deficiency and reproductive function are explored by discussing the potentially impaired fertility and hyperprolactinemia due to iron deficiency and the alterations in iron metabolism due to menstrual blood loss and estrogen exposure. The interaction of iron deficiency with bone health may occur via dysregulation of the growth hormone/insulin-like growth factor-1 axis, hypoxia, and hypothyroidism. Based on these discussions, several future directions for research are presented.
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Affiliation(s)
- Dylan L Petkus
- Department of Kinesiology, The Pennsylvania State University, 104 Noll Laboratory, University Park, PA, 16802, USA
| | - Laura E Murray-Kolb
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA, USA
| | - Mary Jane De Souza
- Department of Kinesiology, The Pennsylvania State University, 104 Noll Laboratory, University Park, PA, 16802, USA.
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Archer E, Pavela G, McDonald S, Lavie CJ, Hill JO. Cell-Specific "Competition for Calories" Drives Asymmetric Nutrient-Energy Partitioning, Obesity, and Metabolic Diseases in Human and Non-human Animals. Front Physiol 2018; 9:1053. [PMID: 30147656 PMCID: PMC6097573 DOI: 10.3389/fphys.2018.01053] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Accepted: 07/16/2018] [Indexed: 12/20/2022] Open
Abstract
The mammalian body is a complex physiologic “ecosystem” in which cells compete for calories (i.e., nutrient-energy). Axiomatically, cell-types with competitive advantages acquire a greater number of consumed calories, and when possible, increase in size and/or number. Thus, it is logical and parsimonious to posit that obesity is the competitive advantages of fat-cells (adipocytes) driving a disproportionate acquisition and storage of nutrient-energy. Accordingly, we introduce two conceptual frameworks. Asymmetric Nutrient-Energy Partitioning describes the context-dependent, cell-specific competition for calories that determines the partitioning of nutrient-energy to oxidation, anabolism, and/or storage; and Effective Caloric Intake which describes the number of calories available to constrain energy-intake via the inhibition of the sensorimotor appetitive cells in the liver and brain that govern ingestive behaviors. Inherent in these frameworks is the independence and dissociation of the energetic demands of metabolism and the neuro-muscular pathways that initiate ingestive behaviors and energy intake. As we demonstrate, if the sensorimotor cells suffer relative caloric deprivation via asymmetric competition from other cell-types (e.g., skeletal muscle- or fat-cells), energy-intake is increased to compensate for both real and merely apparent deficits in energy-homeostasis (i.e., true and false signals, respectively). Thus, we posit that the chronic positive energy balance (i.e., over-nutrition) that leads to obesity and metabolic diseases is engendered by apparent deficits (i.e., false signals) driven by the asymmetric inter-cellular competition for calories and concomitant differential partitioning of nutrient-energy to storage. These frameworks, in concert with our previous theoretic work, the Maternal Resources Hypothesis, provide a parsimonious and rigorous explanation for the rapid rise in the global prevalence of increased body and fat mass, and associated metabolic dysfunctions in humans and other mammals inclusive of companion, domesticated, laboratory, and feral animals.
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Affiliation(s)
| | - Gregory Pavela
- The University of Alabama at Birmingham, Birmingham, AL, United States
| | | | - Carl J Lavie
- School of Medicine, John Ochsner Heart and Vascular Institute, The University of Queensland, New Orleans, LA, United States
| | - James O Hill
- Center for Human Nutrition, University of Colorado Health Sciences Center, Denver, CO, United States
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Licholai JA, Nguyen KP, Fobbs WC, Schuster CJ, Ali MA, Kravitz AV. Why Do Mice Overeat High-Fat Diets? How High-Fat Diet Alters the Regulation of Daily Caloric Intake in Mice. Obesity (Silver Spring) 2018; 26:1026-1033. [PMID: 29707908 PMCID: PMC5970071 DOI: 10.1002/oby.22195] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 02/24/2018] [Accepted: 03/21/2018] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Ad libitum high-fat diets (HFDs) spontaneously increase caloric intake in rodents, which correlates positively with weight gain. However, it remains unclear why rodents overeat HFDs. This paper investigated how changing the proportion of diet that came from HFDs might alter daily caloric intake in mice. METHODS Mice were given 25%, 50%, or 90% of their daily caloric need from an HFD, along with ad libitum access to a low-fat rodent chow diet. Food intake was measured daily to determine how these HFD supplements impacted total daily caloric intake. Follow-up experiments addressed the timing of HFD feeding. RESULTS HFD supplements did not alter total caloric intake or body weight. In a follow-up experiment, mice consumed approximately 50% of their daily caloric need from an HFD in 30 minutes during the light cycle, a time when mice do not normally consume food. CONCLUSIONS An HFD did not disrupt regulation of total daily caloric intake, even when up to 90% of total calories came from the HFD. However, HFDs increased daily caloric intake when provided ad libitum and were readily consumed by mice outside of their normal feeding cycle. Ad libitum HFDs appear to induce overconsumption beyond the mechanisms that regulate daily caloric intake.
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Affiliation(s)
- Julia A Licholai
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
| | - Katrina P Nguyen
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
| | - Wambura C Fobbs
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
| | - Corbin J Schuster
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
| | - Mohamed A Ali
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
| | - Alexxai V Kravitz
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
- National Institute on Drug Abuse, Baltimore, Maryland, USA
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Krishnan S, Hendriks HFJ, Hartvigsen ML, de Graaf AA. Feed-forward neural network model for hunger and satiety related VAS score prediction. Theor Biol Med Model 2016; 13:17. [PMID: 27387922 PMCID: PMC4936290 DOI: 10.1186/s12976-016-0043-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 06/10/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND An artificial neural network approach was chosen to model the outcome of the complex signaling pathways in the gastro-intestinal tract and other peripheral organs that eventually produce the satiety feeling in the brain upon feeding. METHODS A multilayer feed-forward neural network was trained with sets of experimental data relating concentration-time courses of plasma satiety hormones to Visual Analog Scales (VAS) scores. The network successfully predicted VAS responses from sets of satiety hormone data obtained in experiments using different food compositions. RESULTS The correlation coefficients for the predicted VAS responses for test sets having i) a full set of three satiety hormones, ii) a set of only two satiety hormones, and iii) a set of only one satiety hormone were 0.96, 0.96, and 0.89, respectively. The predicted VAS responses discriminated the satiety effects of high satiating food types from less satiating food types both in orally fed and ileal infused forms. CONCLUSIONS From this application of artificial neural networks, one may conclude that neural network models are very suitable to describe situations where behavior is complex and incompletely understood. However, training data sets that fit the experimental conditions need to be available.
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Affiliation(s)
- Shaji Krishnan
- Risk Analysis for Products In Development, TNO, Utrechtseweg 48, P.O. Box 360, Zeist, 3700 AJ, The Netherlands. .,Top Institute Food and Nutrition, Nieuwe Kanaal 9A, Wageningen, 6709 PA, The Netherlands.
| | - Henk F J Hendriks
- Top Institute Food and Nutrition, Nieuwe Kanaal 9A, Wageningen, 6709 PA, The Netherlands
| | - Merete L Hartvigsen
- Department of Endocrinology and Internal Medicine, Aarhus University, Tage-Hansens Gade 2, Aarhus C, DK-8000, Denmark
| | - Albert A de Graaf
- Risk Analysis for Products In Development, TNO, Utrechtseweg 48, P.O. Box 360, Zeist, 3700 AJ, The Netherlands.,Top Institute Food and Nutrition, Nieuwe Kanaal 9A, Wageningen, 6709 PA, The Netherlands
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Abstract
Cancer cachexia is a wasting syndrome characterized by weight loss, anorexia, asthenia and anemia. The pathogenicity of this syndrome is multifactorial, due to a complex interaction of tumor and host factors. The signs and symptoms of cachexia are considered as the prognostic parameters in cancer patients. This review gives an emphasis on the various mechanisms involved in cachexia and an insight into head and neck cancer cachexia.
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Affiliation(s)
- Raghu Dhanapal
- Department of Oral Pathology, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India
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