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Prater MC, Guadagni AJ, Cooper JA. Postprandial appetite responses to a pecan enriched meal: A randomized crossover trial. Appetite 2024; 201:107598. [PMID: 38971424 DOI: 10.1016/j.appet.2024.107598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Revised: 06/26/2024] [Accepted: 07/03/2024] [Indexed: 07/08/2024]
Abstract
Longer-term pecan consumption has shown appetite-regulating effects as a part of a free-living diet, yet the physiologic appetite responses to a single pecan-containing meal are unclear. The purpose of this study was to compare the acute physiologic, subjective, and direct appetite responses of a pecan-containing meal to an energy- and macronutrient-matched control meal. This was an acute meal challenge study utilizing a double-blinded randomized crossover design with two periods. Participants were young, healthy adults (BMI: 22.9 ± 3.3 kg/m2, age: 22 ± 3 y) who consumed a meal containing either 68 g of pecans (PEC; 795 kcal) or an energy- and macronutrient-matched control meal (CON; 794 kcal) on separate testing days. At both testing visits, five postprandial blood draws, and visual analog scale (VAS) questionnaires (in-lab) were used to determine differences in peptide YY (PYY), ghrelin, and subjective appetite over a 4-h postprandial period. Participants also completed VAS questionnaires (at-home) and food records for the rest of the day after leaving the testing visits. Thirty-one out of thirty-two randomized participants completed the study. There was a greater overall postprandial PYY response (p < 0.001), and a greater suppression of postprandial ghrelin after time point 120 min (p < 0.001), with the PEC vs. CON meal. Further, there was a greater increase in subjective fullness (p = 0.001), and suppression of at-home overall appetite (p = 0.02), from time 240-780 min post-meal with PEC vs. CON meals. There were no differences in self-reported EI between meals or any other VAS measure. In conclusion, a pecan-containing breakfast shake produced more favorable physiologic and subjective improvements in appetite compared to an energy- and macronutrient-matched control meal. This trial is registered at clinicaltrials.gov (NCT05230212).
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Affiliation(s)
- M Catherine Prater
- Department of Nutritional Sciences, University of Georgia, Athens, GA, USA
| | - Alyssa J Guadagni
- Department of Nutritional Sciences, University of Georgia, Athens, GA, USA
| | - Jamie A Cooper
- Department of Kinesiology, University of Georgia, Athens, GA, USA.
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2
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Fonseca NKO, Curtarelli VD, Bertoletti J, Azevedo K, Cardinal TM, Moreira JD, Antunes LC. Avoidant restrictive food intake disorder: recent advances in neurobiology and treatment. J Eat Disord 2024; 12:74. [PMID: 38849953 PMCID: PMC11157884 DOI: 10.1186/s40337-024-01021-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 05/14/2024] [Indexed: 06/09/2024] Open
Abstract
Avoidant restrictive food intake disorder (ARFID) is an eating disorder characterized by persistent insufficient nutritional and/or energy intake. ARFID, before referred to as "selective eating disorder", was introduced recently in the DSM-5 as a replacement for and expansion of the previous diagnosis. Individuals with ARFID may limit food variety and intake due to avoidance based on the sensory characteristics of the food or related to any adverse consequences of eating without the intention of losing weight and concerns of body image. The limited understanding of avoidant and restrictive eating poses challenges to effective treatment and management, impacting directly on the growth and development of children and adolescents. The ARFID neurobiological concept has not yet been clearly defined to clinical practice for nutritionists, thereby hindering screening and impeding the development of treatment recommendations. This narrative review provide useful practical information to consult the pathophysiology, the neurobiology, the clinical features, the assessment and the treatment for healthcare professionals seeking to enhance their clinical knowledge and management of this disorder.
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Affiliation(s)
- Natasha K O Fonseca
- Graduate Program in Psychiatry and Behavioral Sciences, Universidade Federal do Rio Grande do Sul (UFRGS), Ramiro Barcelos, 2400, Porto Alegre, RS, 90035-003, Brazil.
| | | | | | - Karla Azevedo
- Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
- Translational Nutritional Neuroscience Working Group, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Tiago M Cardinal
- Laboratory of Neuroscience and Eating Behavior, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Júlia D Moreira
- Department of Nutrition, Health Sciences Center, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
- Translational Nutritional Neuroscience Working Group, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Luciana C Antunes
- Laboratory of Neuroscience and Eating Behavior, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
- Department of Nutrition, Health Sciences Center, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
- Translational Nutritional Neuroscience Working Group, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil
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Xing B, Yu J, Zhang H, Li Y. RANKL inhibition: a new target of treating diabetes mellitus? Ther Adv Endocrinol Metab 2023; 14:20420188231170754. [PMID: 37223831 PMCID: PMC10201162 DOI: 10.1177/20420188231170754] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Accepted: 04/03/2023] [Indexed: 05/25/2023] Open
Abstract
Accumulating evidence demonstrates the link between glucose and bone metabolism. The receptor activator of nuclear factor-kB ligand (RANKL)/the receptor activator of NF-κB (RANK)/osteoprotegerin (OPG) axis is an essential signaling axis maintaining the balance between bone resorption and bone formation. In recent years, it has been found that RANKL and RANK are distributed not only in bone but also in the liver, muscle, adipose tissue, pancreas, and other tissues that may influence glucose metabolism. Some scholars have suggested that the blockage of the RANKL signaling may protect islet β-cell function and prevent diabetes; simultaneously, there also exist different views that RANKL can improve insulin resistance through inducing the beige adipocyte differentiation and increase energy expenditure. Currently, the results of the regulatory effect on glucose metabolism of RANKL remain conflicting. Denosumab (Dmab), a fully human monoclonal antibody that can bind to RANKL and prevent osteoclast formation, is a commonly used antiosteoporosis drug. Recent basic studies have found that Dmab seems to regulate glucose homeostasis and β-cell function in humanized mice or in vitro human β-cell models. Besides, some clinical data have also reported the glucometabolic effects of Dmab, however, with limited and inconsistent results. This review mainly describes the impact of the RANKL signaling pathway on glucose metabolism and summarizes clinical evidence that links Dmab and DM to seek a new therapeutic strategy for diabetes.
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Affiliation(s)
- Baodi Xing
- Department of Endocrinology, Key Laboratory of
Endocrinology of National Health Commission, Translation Medicine Center,
Peking Union Medical College Hospital, Chinese Academy of Medical Sciences
and Peking Union Medical College, Beijing, China
| | - Jie Yu
- Department of Endocrinology, Key Laboratory of
Endocrinology of National Health Commission, Translation Medicine Center,
Peking Union Medical College Hospital, Chinese Academy of Medical Sciences
and Peking Union Medical College, Beijing, China
| | - Huabing Zhang
- Department of Endocrinology, NHC Key Laboratory
of Endocrinology, Peking Union Medical College Hospital (Dongdan campus),
Chinese Academy of Medical Sciences and Peking Union Medical College, No.1
Shuaifuyuan, Wangfujing Dongcheng District, Beijing 100730, China
| | - Yuxiu Li
- Department of Endocrinology, NHC Key Laboratory
of Endocrinology, Peking Union Medical College Hospital (Dongdan campus),
Chinese Academy of Medical Sciences and Peking Union Medical College, No.1
Shuaifuyuan, Wangfujing Dongcheng District, Beijing 100730, China
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Li Q, Jiang B, Zhang Z, Huang Y, Xu Z, Chen X, Huang Y, Jian J, Yan Q. α-MSH is partially involved in the immunomodulation of Nile tilapia (Oreochromis niloticus) antibacterial immunity. FISH & SHELLFISH IMMUNOLOGY 2022; 131:929-938. [PMID: 36343851 DOI: 10.1016/j.fsi.2022.11.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 10/31/2022] [Accepted: 11/01/2022] [Indexed: 06/16/2023]
Abstract
α-Melanocyte-stimulating hormone (α-MSH) is a well-studied neuropeptide controlling skin and hair color. Besides, numerous immunomodulation roles of α-MSH were recorded in humans and mice. However, the regulatory effects of α-MSH in teleost immunity haven't been well elucidated. In this study, several precursor molecules of α-MSH (POMCs) and its receptors (MCRs) in Nile tilapia (Oreochromis niloticus) were characterized, and their expression characteristics and specific functions on antibacterial immunity were determined. Overall, POMCs and MCRs were principally detected in the brain, skin, and liver, and were remarkably promoted post Streptococcus agalactiae infection. However, tiny POMCs and MCRs were observed in tilapia immune organs (head kidney and spleen) or lymphocytes, and no evident immunomodulation effect was detected in vitro. Moreover, the in vivo challenge experiments revealed that α-MSH protects tilapia from bacterial infection by regulating responses in the brain and intestine. This study lays theoretical data for a deeper comprehension of the immunomodulation mechanisms of teleost α-MSH and the evolutional process of the vertebrate melanocortin system.
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Affiliation(s)
- Qi Li
- Fisheries College, Jimei University, Xiamen, China; College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang, China
| | - Baijian Jiang
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang, China
| | - Zhiqiang Zhang
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang, China
| | - Yongxiong Huang
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang, China
| | - Zhou Xu
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang, China
| | - Xinjin Chen
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang, China
| | - Yu Huang
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Guangdong Provincial Engineering Research Center for Aquatic Animal Health Assessment, Shenzhen, China
| | - Jichang Jian
- College of Fishery, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Zhanjiang, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Guangdong Provincial Engineering Research Center for Aquatic Animal Health Assessment, Shenzhen, China.
| | - Qingpi Yan
- Fisheries College, Jimei University, Xiamen, China.
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Katz A, Gonen M, Shahar Y, Roichman A, Lerrer B, Cohen HY. Hypothalamus-Muscle Parallel Induction of Metabolic Pathways Following Physical Exercise. Front Neurosci 2022; 16:897005. [PMID: 35928013 PMCID: PMC9344923 DOI: 10.3389/fnins.2022.897005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 05/30/2022] [Indexed: 11/13/2022] Open
Abstract
The modern lifestyle requires less physical activity and skills during our daily routine, leading to multiple pathologies related to physical disabilities and energy accessibility. Thus, exploring the mechanisms underlying the metabolic regulation of exercise is crucial. Here, we characterized the effect of forced and voluntary endurance exercises on three key metabolic signaling pathways, sirtuins, AMPK, and mTOR, across several metabolic tissues in mice: brain, muscles, and liver. Both voluntary and forced exercises induced AMPK with higher intensity in the first. The comparison between those metabolic tissues revealed that the hypothalamus and the hippocampus, two brain parts, showed different metabolic signaling activities. Strikingly, despite the major differences in the physiology of muscles and hypothalamic tissues, the hypothalamus replicates the metabolic response of the muscle in response to physical exercise. Specifically, muscles and hypothalamic tissues showed an increase and a decrease in AMPK and mTOR signaling, respectively. Overall, this study reveals new insight into the relation between the hypothalamus and muscles, which enhances the coordination within the muscle-brain axis and potentially improves the systemic response to physical activity performance and delaying health inactivity disorders.
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Affiliation(s)
| | | | | | | | | | - Haim Yosef Cohen
- The Mina & Everard Goodman Faculty of Life Sciences, The Sagol Center for Healthy Human Longevity, Bar-Ilan University, Ramat-Gan, Israel
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The central nervous system control of energy homeostasis: high fat diet induced hypothalamic microinflammation and obesity. Brain Res Bull 2022; 185:99-106. [PMID: 35525336 DOI: 10.1016/j.brainresbull.2022.04.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 04/27/2022] [Accepted: 04/30/2022] [Indexed: 11/22/2022]
Abstract
Obesity is believed to arise through the imbalance of energy homeostasis controlled by the central nervous system, where the hypothalamus plays the fundamental role in energy metabolism. In this review, we will provide an overview regarding the functions of POMC neurons and AgRP neurons in acute nucleus of the hypothalamus which mediated the energy metabolism, highlighting their interactions with peripheral organs derived hormones in control of energy homeostasis. Furthermore, the role of high fat diet induced hypothalamic microinflammation in the pathogenesis of obesity will be discussed. We hope this review could help researchers to understand the mechanism of hypothalamus in control of energy metabolism, and design related drugs to block the pathways involving in the impaired metabolism in obese patients.
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Hajishizari S, Imani H, Mehranfar S, Saeed Yekaninejad M, Mirzababaei A, Clark CCT, Mirzaei K. The association of appetite and hormones (leptin, ghrelin, and Insulin) with resting metabolic rate in overweight/ obese women: a case-control study. BMC Nutr 2022; 8:37. [PMID: 35484608 PMCID: PMC9052687 DOI: 10.1186/s40795-022-00531-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 04/18/2022] [Indexed: 11/10/2022] Open
Abstract
Objective Low resting metabolic rate (RMR), as a risk factor for weight gain and obesity, can be influenced by many factors. Empirical research has confirmed the role of appetite and related hormones in obesity and energy intake. This study aimed to investigate the relationship between appetite and related hormones in overweight or obese Iranian women with normal and hypo RMR. Methods This case–control study was conducted on 42 Iranian adult women (21 cases, and 21 controls), aged 18–48 years. An impedance body analyzer was used to obtain the body composition and an indirect calorimeter was used to assess the RMR. The Flint questionnaire was used to assess appetite, dietary intake, and physical activity were assessed by FFQ and IPAQ questionnaires respectively, and ELISA kits were used to assess leptin, ghrelin, and insulin hormones. Results The results of the study demonstrated a negative association between ghrelin hormone level (β = -0.34, 95%CI = -61.70,-3.86, P-value = 0.027) and RMR, and a positive association between insulin hormone level (β = 0.48, 95%CI = 9.38–34.35, P-value = 0.001) and RMR. Also, results of the appetite questionnaire showed that, in general, both appetite (β = 0.32, 95%CI = -0.10–2.99 P-value = 0.044) and hunger variable (β = 0.30, 95%CI = 0.04–5.87, P-value = 0.047) have a positive association with RMR. There was no significant association between leptin levels and RMR. Conclusion It is evident that appetite and related hormones have a potential role in promoting a normal RMR.
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Affiliation(s)
- Sara Hajishizari
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - Hossein Imani
- Department of Clinical Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - Sanaz Mehranfar
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - Mir Saeed Yekaninejad
- Department of Epidemiology and Biostatistics, School of Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Atieh Mirzababaei
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - Cain C T Clark
- Centre for Intelligent Healthcare, Coventry University, Coventry, CV1 5FB, UK
| | - Khadijeh Mirzaei
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran.
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Tran LT, Park S, Kim SK, Lee JS, Kim KW, Kwon O. Hypothalamic control of energy expenditure and thermogenesis. Exp Mol Med 2022; 54:358-369. [PMID: 35301430 PMCID: PMC9076616 DOI: 10.1038/s12276-022-00741-z] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 12/05/2021] [Accepted: 12/14/2021] [Indexed: 12/14/2022] Open
Abstract
Energy expenditure and energy intake need to be balanced to maintain proper energy homeostasis. Energy homeostasis is tightly regulated by the central nervous system, and the hypothalamus is the primary center for the regulation of energy balance. The hypothalamus exerts its effect through both humoral and neuronal mechanisms, and each hypothalamic area has a distinct role in the regulation of energy expenditure. Recent studies have advanced the understanding of the molecular regulation of energy expenditure and thermogenesis in the hypothalamus with targeted manipulation techniques of the mouse genome and neuronal function. In this review, we elucidate recent progress in understanding the mechanism of how the hypothalamus affects basal metabolism, modulates physical activity, and adapts to environmental temperature and food intake changes. The hypothalamus is a key regulator of metabolism, controlling resting metabolism, activity levels, and responses to external temperature and food intake. The balance between energy intake and expenditure must be tightly controlled, with imbalances resulting in metabolic disorders such as obesity or diabetes. Obin Kwon at Seoul National University College of Medicine and Ki Woo Kim at Yonsei University College of Dentistry, Seoul, both in South Korea, and coworkers reviewed how metabolism is regulated by the hypothalamus, a small hormone-producing brain region. They report that hormonal and neuronal signals from the hypothalamus influence the ratio of lean to fatty tissue, gender-based differences in metabolism, activity levels, and weight gain in response to food intake. They note that further studies to untangle cause-and-effect relationships and other genetic factors will improve our understanding of metabolic regulation.
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Affiliation(s)
- Le Trung Tran
- Departments of Oral Biology and Applied Biological Science, BK21 Four, Yonsei University College of Dentistry, Seoul, 03722, Korea
| | - Sohee Park
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Korea.,Departments of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, 03080, Korea
| | - Seul Ki Kim
- Departments of Oral Biology and Applied Biological Science, BK21 Four, Yonsei University College of Dentistry, Seoul, 03722, Korea
| | - Jin Sun Lee
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Korea.,Departments of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, 03080, Korea
| | - Ki Woo Kim
- Departments of Oral Biology and Applied Biological Science, BK21 Four, Yonsei University College of Dentistry, Seoul, 03722, Korea.
| | - Obin Kwon
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Korea. .,Departments of Biochemistry and Molecular Biology, Seoul National University College of Medicine, Seoul, 03080, Korea.
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Shin S, Park S, Lim Y, Han SN. Dietary supplementation with Korean pine nut oil decreases body fat accumulation and dysregulation of the appetite-suppressing pathway in the hypothalamus of high-fat diet-induced obese mice. Nutr Res Pract 2022; 16:285-297. [PMID: 35663443 PMCID: PMC9149321 DOI: 10.4162/nrp.2022.16.3.285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 08/19/2021] [Accepted: 09/24/2021] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND/OBJECTIVES Korean pine nut oil (PNO) has been reported to suppress appetite by increasing satiety hormone release. However, previous studies have rendered inconsistent results and there is lack of information on whether dietary Korean PNO affects the expression of satiety hormone receptors and hypothalamic neuropeptides. Therefore, our study sought to evaluate the chronic effects of Korean PNO on the long-term regulation of energy balance. MATERIALS/METHODS Five-week-old male C57BL/6 mice were fed with control diets containing 10% kcal fat from Korean PNO or soybean oil (SBO) (PC or SC) or high-fat diets (HFDs) containing 35% kcal fat from lard and 10% kcal fat from Korean PNO or SBO (PHFD or SHFD) for 12 weeks. The expression of gastrointestinal satiety hormone receptors, hypothalamic neuropeptides, and genes related to intestinal lipid absorption and adipose lipid metabolism was then measured. RESULTS There was no difference in the daily food intake between PNO- and SBO-fed mice; however, the PC and PHFD groups accumulated 30% and 18% less fat compared to SC and SHFD, respectively. Korean PNO-fed mice exhibited higher messenger RNA (mRNA) expression of Ghsr (ghrelin receptor) and Agrp (agouti-related peptide) (P < 0.05), which are expressed when energy consumption is low to induce appetite as well as the appetite-suppressing neuropeptides Pomc and Cartpt (P = 0.079 and 0.056, respectively). Korean PNO downregulated jejunal Cd36 and epididymal Lpl mRNA expressions, which could suppress intestinal fatty acid absorption and fat storage in white adipose tissue. Consistent with these findings, Korean PNO-fed mice had higher levels of fecal non-esterified fatty acid excretion. Korean PNO also tended to downregulate jejunal Apoa4 and upregulate epididymal Adrb3 mRNA levels, suggesting that PNO may decrease chylomicron synthesis and induce lipolysis. CONCLUSIONS In summary, Korean PNO attenuated body fat accumulation, and appeared to prevent HFD-induced dysregulation of the hypothalamic appetite-suppressing pathway.
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Affiliation(s)
- Sunhye Shin
- Major of Food and Nutrition, Division of Applied Food System, Seoul Women's University, Seoul 01797, Korea
- Department of Food and Nutrition, College of Human Ecology, Seoul National University, Seoul 08826, Korea
| | - Soyoung Park
- Department of Food and Nutrition, College of Human Ecology, Seoul National University, Seoul 08826, Korea
| | - Yeseo Lim
- Department of Food and Nutrition, College of Human Ecology, Seoul National University, Seoul 08826, Korea
| | - Sung Nim Han
- Department of Food and Nutrition, College of Human Ecology, Seoul National University, Seoul 08826, Korea
- Research Institute of Human Ecology, Seoul National University, Seoul 08826, Korea
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Song N, Jeong DY, Tu TH, Park BS, Yang HR, Kim YJ, Kim JK, Park JT, Yeh JY, Yang S, Kim JG. Adiponectin Controls Nutrient Availability in Hypothalamic Astrocytes. Int J Mol Sci 2021; 22:ijms22041587. [PMID: 33557390 PMCID: PMC7915184 DOI: 10.3390/ijms22041587] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 01/27/2021] [Accepted: 02/01/2021] [Indexed: 12/12/2022] Open
Abstract
Adiponectin, an adipose tissue-derived hormone, plays integral roles in lipid and glucose metabolism in peripheral tissues, such as the skeletal muscle, adipose tissue, and liver. Moreover, it has also been shown to have an impact on metabolic processes in the central nervous system. Astrocytes comprise the most abundant cell type in the central nervous system and actively participate in metabolic processes between blood vessels and neurons. However, the ability of adiponectin to control nutrient metabolism in astrocytes has not yet been fully elucidated. In this study, we investigated the effects of adiponectin on multiple metabolic processes in hypothalamic astrocytes. Adiponectin enhanced glucose uptake, glycolytic processes and fatty acid oxidation in cultured primary hypothalamic astrocytes. In line with these findings, we also found that adiponectin treatment effectively enhanced synthesis and release of monocarboxylates. Overall, these data suggested that adiponectin triggers catabolic processes in astrocytes, thereby enhancing nutrient availability in the hypothalamus.
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Affiliation(s)
- Nuri Song
- Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Korea; (N.S.); (D.Y.J.); (T.H.T.); (H.R.Y.); (Y.J.K.); (J.K.K.); (J.T.P.); (J.-Y.Y.)
| | - Da Yeon Jeong
- Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Korea; (N.S.); (D.Y.J.); (T.H.T.); (H.R.Y.); (Y.J.K.); (J.K.K.); (J.T.P.); (J.-Y.Y.)
| | - Thai Hien Tu
- Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Korea; (N.S.); (D.Y.J.); (T.H.T.); (H.R.Y.); (Y.J.K.); (J.K.K.); (J.T.P.); (J.-Y.Y.)
| | - Byong Seo Park
- Department of Biological Science, University of Ulsan, Ulsan 44610, Korea;
| | - Hye Rim Yang
- Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Korea; (N.S.); (D.Y.J.); (T.H.T.); (H.R.Y.); (Y.J.K.); (J.K.K.); (J.T.P.); (J.-Y.Y.)
| | - Ye Jin Kim
- Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Korea; (N.S.); (D.Y.J.); (T.H.T.); (H.R.Y.); (Y.J.K.); (J.K.K.); (J.T.P.); (J.-Y.Y.)
| | - Jae Kwang Kim
- Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Korea; (N.S.); (D.Y.J.); (T.H.T.); (H.R.Y.); (Y.J.K.); (J.K.K.); (J.T.P.); (J.-Y.Y.)
| | - Joon Tae Park
- Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Korea; (N.S.); (D.Y.J.); (T.H.T.); (H.R.Y.); (Y.J.K.); (J.K.K.); (J.T.P.); (J.-Y.Y.)
| | - Jung-Yong Yeh
- Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Korea; (N.S.); (D.Y.J.); (T.H.T.); (H.R.Y.); (Y.J.K.); (J.K.K.); (J.T.P.); (J.-Y.Y.)
| | - Sunggu Yang
- Department of Nano-Bioengineering, Incheon National University, Incheon 406-772, Korea
- Correspondence: (S.Y.); (J.G.K.); Tel.: +82-32-835-8257 (S.Y.); +82-32-835-8256 (J.G.K.)
| | - Jae Geun Kim
- Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 406-772, Korea; (N.S.); (D.Y.J.); (T.H.T.); (H.R.Y.); (Y.J.K.); (J.K.K.); (J.T.P.); (J.-Y.Y.)
- Correspondence: (S.Y.); (J.G.K.); Tel.: +82-32-835-8257 (S.Y.); +82-32-835-8256 (J.G.K.)
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Aylwin CF, Lomniczi A. Sirtuin (SIRT)-1: At the crossroads of puberty and metabolism. CURRENT OPINION IN ENDOCRINE AND METABOLIC RESEARCH 2020; 14:65-72. [PMID: 32905232 PMCID: PMC7467505 DOI: 10.1016/j.coemr.2020.06.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
In the arcuate nucleus (ARC) of the hypothalamus reside two neuronal systems in charge of regulating feeding control and reproductive development. The melanocortin system responds to metabolic fluctuations adjusting food intake, whereas kisspeptin neurons are in charge of the excitatory control of Gonadotropin Hormone Releasing Hormone (GnRH) neurons. While it is known that the melanocortin system regulates GnRH neuronal activity, it was recently demonstrated that kisspeptin neurons not only innervate melanocortin neurons, but also play an active role in the control of metabolism. These two neuronal systems are intricately interconnected forming loops of stimulation and inhibition according to metabolic status. Furthermore, intracellular and epigenetic pathways respond to external environmental signals by changing DNA conformation and gene expression. Here we review the role of Silent mating type Information Regulation 2 homologue 1 (Sirt1), a class III NAD+ dependent protein deacetylase, in the ARC control of pubertal development and feeding behavior.
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Affiliation(s)
- Carlos F Aylwin
- Division of Neuroscience, Oregon National Primate Research Center, OHSU, Beaverton, OR, USA
| | - Alejandro Lomniczi
- Division of Neuroscience, Oregon National Primate Research Center, OHSU, Beaverton, OR, USA
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Ramírez-Orozco RE, García-Ruiz R, Morales P, Villalón CM, Villafán-Bernal JR, Marichal-Cancino BA. Potential metabolic and behavioural roles of the putative endocannabinoid receptors GPR18, GPR55 and GPR119 in feeding. Curr Neuropharmacol 2020; 17:947-960. [PMID: 31146657 PMCID: PMC7052828 DOI: 10.2174/1570159x17666190118143014] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 10/26/2018] [Accepted: 11/20/2018] [Indexed: 01/28/2023] Open
Abstract
Endocannabinoids are ancient biomolecules involved in several cellular (e.g., metabolism) and physiological (e.g., eating behaviour) functions. Indeed, eating behaviour alterations in marijuana users have led to investigate the orexigen-ic/anorexigenic effects of cannabinoids in animal/human models. This increasing body of research suggests that the endo-cannabinoid system plays an important role in feeding control. Accordingly, within the endocannabinoid system, canna-binoid receptors, enzymes and genes represent potential therapeutic targets for dealing with multiple metabolic and behav-ioural dysfunctions (e.g., obesity, anorexia, etc.). Paradoxically, our understanding on the endocannabinoid system as a cel-lular mediator is yet limited. For example: (i) only two cannabinoid receptors have been classified, but they are not enough to explain the pharmacological profile of several experimental effects induced by cannabinoids; and (ii) several orphan G pro-tein-coupled receptors (GPCRs) interact with cannabinoids and we do not know how to classify them (e.g., GPR18, GPR55 and GPR119; amongst others). On this basis, the present review attempts to summarize the lines of evidence supporting the potential role of GPR18, GPR55 and GPR119 in metabolism and feeding control that may explain some of the divergent effects and puzzling data re-lated to cannabinoid research. Moreover, their therapeutic potential in feeding behaviour alterations will be considered.
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Affiliation(s)
- Ricardo E Ramírez-Orozco
- Departamento de Nutricion y Cultura Fisica, Centro de Ciencias de la Salud, Universidad Autonoma de Aguascalientes, Ciudad Universitaria, 20131 Aguascalientes, Ags, Mexico
| | - Ricardo García-Ruiz
- Departamento de Fisiologia, Facultad de Medicina. Universidad Nacional Autonoma de Mexico, Ciudad de Mexico, Mexico
| | - Paula Morales
- Instituto de Quimica Fisica Rocasolano, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain
| | - Carlos M Villalón
- Departamento de Farmacobiologia, Cinvestav- Coapa, Czda. Tenorios 235, Col. Granjas-Coapa, Deleg. Tlalpan, 14330 Ciudad de Mexico, Mexico
| | - J Rafael Villafán-Bernal
- Departamento de Cirugia, Centro de Ciencias de la Salud, Universidad Autonoma de Aguascalientes, CP 20131 Aguascalientes, Ags, Mexico
| | - Bruno A Marichal-Cancino
- Departamento de Fisiologia y Farmacologia, Centro de Ciencias Basicas, Universidad Autonoma de Aguascalientes, Ciudad Universitaria, 20131 Aguascalientes, Ags, Mexico
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Lasisi TJ, Shittu ST, Alada AR. Switching to normal diet reverses kwashiorkor-induced salivary impairments via increased nitric oxide level and expression of aquaporin 5 in the submandibular glands of male Wistar rats. Appl Physiol Nutr Metab 2018; 44:365-372. [PMID: 30212637 DOI: 10.1139/apnm-2018-0282] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Kwashiorkor, a form of malnutrition, has been shown to cause impaired salivary secretion. However, there is dearth of information on the mechanism that underlies this complication. Also, whether returning to normal diet after kwashiorkor will reverse these complications or not is yet to be discerned. Thus, this study aimed at assessing the mechanisms that underlie kwashiorkor-induced salivary impairments and to evaluate the effects of switching back to normal-diet on kwashiorkor-induced salivary impairments. Weaning rats were randomly divided into 3 groups (control group, kwashiorkor group (KG), re-fed kwashiorkor group (RKG)) of 7 rats each. The control group had standard rat chow while the KG and RKG were fed 2% protein diet for 6 weeks to induce kwashiorkor. The RKG had their diet changed to standard rat-chow for another 6 weeks. Blood and stimulated saliva samples were collected for the analysis of total protein, electrolytes, amylase, immunoglobulin A (IgA) secretion rate, leptin, and ghrelin. Tissue total protein, nitric oxide level, expressions of Na+/K+-ATPase, muscarinic (M3) receptor, and aquaporin 5 in the submandibular glands were also determined. Data were presented as means ± SEM and compared using ANOVA with Tukey's post hoc test. RKG showed improved salivary function evidenced by reduced salivary lag-time and potassium and increased flow rate, sodium, amylase, IgA secretion rate, leptin, submandibular nitric oxide level, and aquaporin 5 expression compared with KG. This study for the first time demonstrated that kwashiorkor caused significant reduction in salivary secretion through reduction of nitric oxide level and aquaporin 5 expression in submandibular salivary glands. Normal-diet re-feeding after kwashiorkor returned salivary secretion to normal.
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Affiliation(s)
- Taye Jemilat Lasisi
- a Department of Physiology, College of Medicine, University of Ibadan, PO Box 22040, Ibadan 200284, Nigeria.,b Department of Oral Pathology, College of Medicine, University of Ibadan, Ibadan 200284, Nigeria
| | - Shehu Tijani Shittu
- a Department of Physiology, College of Medicine, University of Ibadan, PO Box 22040, Ibadan 200284, Nigeria
| | - Akinola Rasak Alada
- a Department of Physiology, College of Medicine, University of Ibadan, PO Box 22040, Ibadan 200284, Nigeria
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Halah MP, Marangon PB, Antunes-Rodrigues J, Elias LLK. Neonatal nutritional programming impairs adiponectin effects on energy homeostasis in adult life of male rats. Am J Physiol Endocrinol Metab 2018; 315:E29-E37. [PMID: 29438632 DOI: 10.1152/ajpendo.00358.2017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Neonatal nutritional changes induce long-lasting effects on energy homeostasis. Adiponectin influences food intake and body weight. The aim of this study was to investigate the effects of neonatal nutritional programming on the central stimulation of adiponectin. Male Wistar rats were divided on postnatal (PN) day 3 in litters of 3 (small litter, SL), 10 (normal litter, NL), or 16 pups/dam (large litter, LL). We assessed body weight gain for 60 days, adiponectin concentration, and white adipose tissue weight. We examined the response of SL, NL, and LL rats on body weight gain, food intake, oxygen consumption (V̇o2), respiratory exchange ratio (RER), calorimetry, locomotor activity, phosphorylated-AMP-activated protein kinase (AMPK) expression in the hypothalamus, and uncoupling protein (UCP)-1 in the brown adipose tissue after central stimulus with adiponectin. After weaning, SL rats maintained higher body weight gain despite similar food intake compared with NL rats. LL rats showed lower body weight at weaning, with a catch up afterward and higher food intake. Both LL and SL groups had decreased plasma concentrations of adiponectin at PN60. SL rats had increased white adipose tissue. Central injection of adiponectin decreased body weight and food intake and increased V̇o2, RER, calorimetry, p-AMPK and UCP- 1 expression in NL rats, but it had no effect on SL and LL rats, compared with the respective vehicle groups. In conclusion, neonatal under- and overfeeding induced an increase in body weight gain in juvenile and early adult life. Unresponsiveness to central effects of adiponectin contributes to the imbalance of the energy homeostasis in adult life induced by neonatal nutritional programming.
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Affiliation(s)
- Mariana Peduti Halah
- Department of Physiology, Ribeirao Preto Medical School University of Sao Paulo , Sao Paulo , Brazil
| | - Paula Beatriz Marangon
- Department of Physiology, Ribeirao Preto Medical School University of Sao Paulo , Sao Paulo , Brazil
| | - Jose Antunes-Rodrigues
- Department of Physiology, Ribeirao Preto Medical School University of Sao Paulo , Sao Paulo , Brazil
| | - Lucila L K Elias
- Department of Physiology, Ribeirao Preto Medical School University of Sao Paulo , Sao Paulo , Brazil
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Maternal overnutrition programs epigenetic changes in the regulatory regions of hypothalamic Pomc in the offspring of rats. Int J Obes (Lond) 2018; 42:1431-1444. [PMID: 29777232 PMCID: PMC6113193 DOI: 10.1038/s41366-018-0094-1] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 02/27/2018] [Accepted: 03/16/2018] [Indexed: 02/02/2023]
Abstract
Background and objective Maternal overnutrition has been implicated in affecting the offspring by programming metabolic disorders such as obesity and diabetes, by mechanisms that are not clearly understood. This study aimed to determine the long-term impact of maternal high-fat (HF) diet feeding on epigenetic changes in the offspring’s hypothalamic Pomc gene, coding a key factor in the control of energy balance. Further, it aimed to study the additional effects of postnatal overnutrition on epigenetic programming by maternal nutrition. Methods Eight-week-old female Sprague–Dawley rats were fed HF diet or low-fat (LF) diet for 6 weeks before mating, and throughout gestation and lactation. At postnatal day 21, samples were collected from a third offspring and the remainder were weaned onto LF diet for 5 weeks, after which they were either fed LF or HF diet for 12 weeks, resulting in four groups of offspring differing by their maternal and postweaning diet. Results With maternal HF diet, offspring at weaning had rapid early weight gain, increased adiposity, and hyperleptinemia. The programmed adult offspring, subsequently fed LF diet, retained the increased body weight. Maternal HF diet combined with offspring HF diet caused more pronounced hyperphagia, fat mass, and insulin resistance. The ARC Pomc gene from programmed offspring at weaning showed hypermethylation in the enhancer (nPE1 and nPE2) regions and in the promoter sequence mediating leptin effects. Interestingly, hypermethylation at the Pomc promoter but not at the enhancer region persisted long term into adulthood in the programmed offspring. However, there were no additive effects on methylation levels in the regulatory regions of Pomc in programmed offspring fed a HF diet. Conclusion Maternal overnutrition programs long-term epigenetic alterations in the offspring’s hypothalamic Pomc promoter. This predisposes the offspring to metabolic disorders later in life.
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Nakhate KT, Subhedar NK, Kokare DM. A role of neuropeptide CART in hyperphagia and weight gain induced by olanzapine treatment in rats. Brain Res 2018; 1695:45-52. [PMID: 29775565 DOI: 10.1016/j.brainres.2018.05.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2018] [Revised: 04/23/2018] [Accepted: 05/14/2018] [Indexed: 01/09/2023]
Abstract
Although olanzapine is highly efficacious and most widely used second generation antipsychotic drug, the success of treatment has been hampered by its propensity to induce weight gain. While the underlying neuronal mechanisms are unclear, their elucidation may help to target alternative pathways regulating energy balance. The present study was undertaken to define the role of cocaine- and amphetamine-regulated transcript (CART), a well-known anorexic peptide, in olanzapine-induced hyperphagia and body weight gain in female rats. Olanzapine was administered daily by intraperitoneal route, alone or in combination with CART (intracerebroventricular) for a period of two weeks. Immediately after drug administrations, preweighed food was offered to the animals at the commencement of the dark phase. The food intake and body weight were measured daily just prior to next injection. Furthermore, the brains of olanzapine-treated rats were processed for the immunohistochemical analysis of CART-containing elements in the hypothalamus. Treatment with olanzapine (0.5 mg/kg) for the duration of 14 days produced a significant increase in food intake and body weight as compared to control. However, concomitant administration of CART (0.5 µg) attenuated the olanzapine-induced hyperphagia and weight gain. Olanzapine administration resulted in a significant reduction in CART immunoreactivity in the hypothalamic arcuate, paraventricular, dorsomedial and ventromedial nuclei. We suggest that decreased CART contents in the hypothalamus may be causally linked with the hyperphagia and weight gain induced by olanzapine.
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Affiliation(s)
- Kartik T Nakhate
- Rungta College of Pharmaceutical Sciences and Research, Rungta Educational Campus, Kohka-Kurud Road, Bhilai 490 024, Chhattisgarh, India
| | - Nishikant K Subhedar
- Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha Road, Near NCL, Pune 411 021, Maharashtra, India
| | - Dadasaheb M Kokare
- Department of Pharmaceutical Sciences, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur 440 033, Maharashtra, India.
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Perron IJ, Keenan BT, Chellappa K, Lahens NF, Yohn NL, Shockley KR, Pack AI, Veasey SC. Dietary challenges differentially affect activity and sleep/wake behavior in mus musculus: Isolating independent associations with diet/energy balance and body weight. PLoS One 2018; 13:e0196743. [PMID: 29746501 PMCID: PMC5945034 DOI: 10.1371/journal.pone.0196743] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 04/18/2018] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND AND AIMS Associated with numerous metabolic and behavioral abnormalities, obesity is classified by metrics reliant on body weight (such as body mass index). However, overnutrition is the common cause of obesity, and may independently contribute to these obesity-related abnormalities. Here, we use dietary challenges to parse apart the relative influence of diet and/or energy balance from body weight on various metabolic and behavioral outcomes. MATERIALS AND METHODS Seventy male mice (mus musculus) were subjected to the diet switch feeding paradigm, generating groups with various body weights and energetic imbalances. Spontaneous activity patterns, blood metabolite levels, and unbiased gene expression of the nutrient-sensing ventral hypothalamus (using RNA-sequencing) were measured, and these metrics were compared using standardized multivariate linear regression models. RESULTS Spontaneous activity patterns were negatively related to body weight (p<0.0001) but not diet/energy balance (p = 0.63). Both body weight and diet/energy balance predicted circulating glucose and insulin levels, while body weight alone predicted plasma leptin levels. Regarding gene expression within the ventral hypothalamus, only two genes responded to diet/energy balance (neuropeptide y [npy] and agouti-related peptide [agrp]), while others were related only to body weight. CONCLUSIONS Collectively, these results demonstrate that individual components of obesity-specifically obesogenic diets/energy imbalance and elevated body mass-can have independent effects on metabolic and behavioral outcomes. This work highlights the shortcomings of using body mass-based indices to assess metabolic health, and identifies novel associations between blood biomarkers, neural gene expression, and animal behavior following dietary challenges.
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Affiliation(s)
- Isaac J. Perron
- Center for Sleep and Circadian Neurobiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail: ,
| | - Brendan T. Keenan
- Center for Sleep and Circadian Neurobiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Karthikeyani Chellappa
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Nicholas F. Lahens
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Nicole L. Yohn
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Keith R. Shockley
- Biostatistics and Computational Biology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, United States of America
| | - Allan I. Pack
- Center for Sleep and Circadian Neurobiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Sigrid C. Veasey
- Center for Sleep and Circadian Neurobiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
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Gas-phase structural characterization of neuropeptides Y Y1 receptor antagonists using mass spectrometry: Orbitrap vs triple quadrupole. J Pharm Biomed Anal 2018; 151:227-234. [PMID: 29367160 DOI: 10.1016/j.jpba.2018.01.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 12/28/2017] [Accepted: 01/08/2018] [Indexed: 01/05/2023]
Abstract
Collision induced dissociation of triple quadrupole mass spectrometer (CID-QqQ) and high-energy collision dissociation (HCD) of Orbitrap were compared for four neuropeptides Y Y1 (NPY Y1) receptor antagonists and showed similar qualitative fragmentation and structural information. Orbitrap high resolution and high mass accuracy HCD fragmentation spectra allowed unambiguous identification of product ions in the range 0.04-4.25 ppm. Orbitrap mass spectrometry showed abundant analyte-specific product ions also observed on CID-QqQ. These results show the suitability of these product ions for use in quantitative analysis by MRM mode. In addition, it was found that all compounds could be determined at levels >1 μg L-1 using the QqQ instrument and that the detection limits for this analyzer ranged from 0.02 to 0.6 μg L-1. Overall, the results obtained from experiments acquired in QqQ show a good agreement with those acquired from the Orbitrap instrument allowing the use of this relatively inexpensive technique (QqQ) for accurate quantification of these compounds in clinical and academic applications.
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MANF regulates hypothalamic control of food intake and body weight. Nat Commun 2017; 8:579. [PMID: 28924165 PMCID: PMC5603516 DOI: 10.1038/s41467-017-00750-x] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 07/25/2017] [Indexed: 12/30/2022] Open
Abstract
The hypothalamus has a vital role in controlling food intake and energy homeostasis; its activity is modulated by neuropeptides and endocrine factors. Mesencephalic astrocyte-derived neurotrophic factor (MANF) is a neurotrophic factor that is also localized in the endoplasmic reticulum (ER) in neurons. Here we show that MANF is highly enriched in distinct nuclei of the mouse hypothalamus, and that MANF expression in the hypothalamus is upregulated in response to fasting. Increasing or decreasing hypothalamic MANF protein levels causes hyperphagia or hypophagia, respectively. Moreover, MANF triggers hypothalamic insulin resistance by enhancing the ER localization and activity of PIP4k2b, a kinase known to regulate insulin signaling. Our findings indicate that MANF influences food intake and body weight by modulating hypothalamic insulin signaling.MANF is a neurotrophic factor that is secreted but also mediates the unfolded protein response acting intracellularly. Here, the authors show that MANF expression in the brain is influenced by nutritional cues, and hypothalamic MANF influences food intake and systemic energy homeostasis.
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Ulyanova A, To XV, Asad ABMA, Han W, Chuang KH. MEMRI detects neuronal activity and connectivity in hypothalamic neural circuit responding to leptin. Neuroimage 2016; 147:904-915. [PMID: 27729278 DOI: 10.1016/j.neuroimage.2016.10.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 10/03/2016] [Accepted: 10/07/2016] [Indexed: 10/20/2022] Open
Abstract
Hypothalamus plays the central role in regulating energy homeostasis. To understand the hypothalamic neurocircuit in responding to leptin, Manganese-Enhanced MRI (MEMRI) was applied. Highly elevated signal could be mapped in major nuclei of the leptin signaling pathway, including the arcuate nucleus (ARC), paraventricular nucleus (PVN), ventromedial hypothalamus (VMH) and dorsomedial hypothalamus (DMH) in fasted mice and the enhancement was reduced by leptin administration. However, whether changes in MEMRI signal reflect Ca2+ channel activity, neuronal activation or connectivity in the leptin signaling pathway are not clear. By blocking L-type Ca2+ channels, the signal enhancement in the ARC, PVN and DMH, but not VMH, was reduced. By disrupting microtubule with colchicine, signal enhancement of the secondary neural areas like DMH and PVN was delayed which is consistent with the known projection density from ARC into these regions. Finally, strong correlation between c-fos expression and MEMRI signal increase rate was observed in the ARC, VMH and DMH. Together, we provide experimental evidence that MEMRI signal could represent activity and connectivity in certain hypothalamic nuclei and hence may be used for mapping activated neuronal pathway in vivo. This understanding would facilitate the application of MEMRI for evaluation of hypothalamic dysfunction in metabolic diseases.
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Affiliation(s)
- Anna Ulyanova
- Magnetic Resonance Imaging Group, Singapore Bioimaging Consortium, Agency for Science Technology and Research (A⁎STAR), Singapore; Department of Physiology, National University of Singapore, Singapore
| | - Xuan Vinh To
- Magnetic Resonance Imaging Group, Singapore Bioimaging Consortium, Agency for Science Technology and Research (A⁎STAR), Singapore
| | - A B M A Asad
- Magnetic Resonance Imaging Group, Singapore Bioimaging Consortium, Agency for Science Technology and Research (A⁎STAR), Singapore
| | - Weiping Han
- Lab of Metabolic Medicine, Singapore Bioimaging Consortium, A⁎STAR, Singapore
| | - Kai-Hsiang Chuang
- Magnetic Resonance Imaging Group, Singapore Bioimaging Consortium, Agency for Science Technology and Research (A⁎STAR), Singapore; Department of Physiology, National University of Singapore, Singapore.
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Salomäki-Myftari H, Vähätalo LH, Ailanen L, Pietilä S, Laiho A, Hänninen A, Pursiheimo JP, Munukka E, Rintala A, Savontaus E, Pesonen U, Koulu M. Neuropeptide Y Overexpressing Female and Male Mice Show Divergent Metabolic but Not Gut Microbial Responses to Prenatal Metformin Exposure. PLoS One 2016; 11:e0163805. [PMID: 27681875 PMCID: PMC5040270 DOI: 10.1371/journal.pone.0163805] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 09/14/2016] [Indexed: 11/19/2022] Open
Abstract
Background Prenatal metformin exposure has been shown to improve the metabolic outcome in the offspring of high fat diet fed dams. However, if this is evident also in a genetic model of obesity and whether gut microbiota has a role, is not known. Methods The metabolic effects of prenatal metformin exposure were investigated in a genetic model of obesity, mice overexpressing neuropeptide Y in the sympathetic nervous system and in brain noradrenergic neurons (OE-NPYDβH). Metformin was given for 18 days to the mated female mice. Body weight, body composition, glucose tolerance and serum parameters of the offspring were investigated on regular diet from weaning and sequentially on western diet (at the age of 5–7 months). Gut microbiota composition was analysed by 16S rRNA sequencing at 10–11 weeks. Results In the male offspring, metformin exposure inhibited weight gain. Moreover, weight of white fat depots and serum insulin and lipids tended to be lower at 7 months. In contrast, in the female offspring, metformin exposure impaired glucose tolerance at 3 months, and subsequently increased body weight gain, fat mass and serum cholesterol. In the gut microbiota, a decline in Erysipelotrichaceae and Odoribacter was detected in the metformin exposed offspring. Furthermore, the abundance of Sutterella tended to be decreased and Parabacteroides increased. Gut microbiota composition of the metformin exposed male offspring correlated to their metabolic phenotype. Conclusion Prenatal metformin exposure caused divergent metabolic phenotypes in the female and male offspring. Nevertheless, gut microbiota of metformin exposed offspring was similarly modified in both genders.
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Affiliation(s)
- Henriikka Salomäki-Myftari
- Institute of Biomedicine, Department of Pharmacology, Drug Development and Therapeutics, University of Turku, Turku, Finland
- Drug Research Doctoral Programme (DRDP), University of Turku, Turku, Finland
| | - Laura H. Vähätalo
- Institute of Biomedicine, Department of Pharmacology, Drug Development and Therapeutics, University of Turku, Turku, Finland
- Drug Research Doctoral Programme (DRDP), University of Turku, Turku, Finland
| | - Liisa Ailanen
- Institute of Biomedicine, Department of Pharmacology, Drug Development and Therapeutics, University of Turku, Turku, Finland
- Drug Research Doctoral Programme (DRDP), University of Turku, Turku, Finland
| | - Sami Pietilä
- Bioinformatics Unit, Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku, Finland
| | - Asta Laiho
- Bioinformatics Unit, Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku, Finland
| | - Arno Hänninen
- Institute of Biomedicine, Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland
| | - Juha-Pekka Pursiheimo
- Turku Clinical Sequencing Laboratory, Institute of Biomedicine, University of Turku, Turku, Finland
| | - Eveliina Munukka
- Institute of Biomedicine, Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland
| | - Anniina Rintala
- Institute of Biomedicine, Department of Medical Microbiology and Immunology, University of Turku, Turku, Finland
| | - Eriika Savontaus
- Institute of Biomedicine, Department of Pharmacology, Drug Development and Therapeutics, University of Turku, Turku, Finland
| | - Ullamari Pesonen
- Institute of Biomedicine, Department of Pharmacology, Drug Development and Therapeutics, University of Turku, Turku, Finland
| | - Markku Koulu
- Institute of Biomedicine, Department of Pharmacology, Drug Development and Therapeutics, University of Turku, Turku, Finland
- * E-mail:
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Tungalagsuvd A, Matsuzaki T, Iwasa T, Munkhzaya M, Yiliyasi M, Kawami T, Kato T, Kuwahara A, Irahara M. The expression of orexigenic and anorexigenic factors in middle‐aged female rats that had been subjected to prenatal undernutrition. Int J Dev Neurosci 2015; 49:1-5. [DOI: 10.1016/j.ijdevneu.2015.12.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 12/10/2015] [Accepted: 12/11/2015] [Indexed: 11/16/2022] Open
Affiliation(s)
- Altankhuu Tungalagsuvd
- Department of Obstetrics and GynecologyTokushima UniversityGraduate SchoolInstitute of Medical Sciences3‐18‐15 Kuramoto‐ChoTokushima770‐8503Japan
| | - Toshiya Matsuzaki
- Department of Obstetrics and GynecologyTokushima UniversityGraduate SchoolInstitute of Medical Sciences3‐18‐15 Kuramoto‐ChoTokushima770‐8503Japan
| | - Takeshi Iwasa
- Department of Obstetrics and GynecologyTokushima UniversityGraduate SchoolInstitute of Medical Sciences3‐18‐15 Kuramoto‐ChoTokushima770‐8503Japan
| | - Munkhsaikhan Munkhzaya
- Department of Obstetrics and GynecologyTokushima UniversityGraduate SchoolInstitute of Medical Sciences3‐18‐15 Kuramoto‐ChoTokushima770‐8503Japan
| | - Mayila Yiliyasi
- Department of Obstetrics and GynecologyTokushima UniversityGraduate SchoolInstitute of Medical Sciences3‐18‐15 Kuramoto‐ChoTokushima770‐8503Japan
| | - Takako Kawami
- Department of Obstetrics and GynecologyTokushima UniversityGraduate SchoolInstitute of Medical Sciences3‐18‐15 Kuramoto‐ChoTokushima770‐8503Japan
| | - Takeshi Kato
- Department of Obstetrics and GynecologyTokushima UniversityGraduate SchoolInstitute of Medical Sciences3‐18‐15 Kuramoto‐ChoTokushima770‐8503Japan
| | - Akira Kuwahara
- Department of Obstetrics and GynecologyTokushima UniversityGraduate SchoolInstitute of Medical Sciences3‐18‐15 Kuramoto‐ChoTokushima770‐8503Japan
| | - Minoru Irahara
- Department of Obstetrics and GynecologyTokushima UniversityGraduate SchoolInstitute of Medical Sciences3‐18‐15 Kuramoto‐ChoTokushima770‐8503Japan
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Kaspi A, Ziemann M, Keating ST, Khurana I, Connor T, Spolding B, Cooper A, Lazarus R, Walder K, Zimmet P, El-Osta A. Non-referenced genome assembly from epigenomic short-read data. Epigenetics 2015; 9:1329-38. [PMID: 25437048 DOI: 10.4161/15592294.2014.969610] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Current computational methods used to analyze changes in DNA methylation and chromatin modification rely on sequenced genomes. Here we describe a pipeline for the detection of these changes from short-read sequence data that does not require a reference genome. Open source software packages were used for sequence assembly, alignment, and measurement of differential enrichment. The method was evaluated by comparing results with reference-based results showing a strong correlation between chromatin modification and gene expression. We then used our de novo sequence assembly to build the DNA methylation profile for the non-referenced Psammomys obesus genome. The pipeline described uses open source software for fast annotation and visualization of unreferenced genomic regions from short-read data.
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Affiliation(s)
- Antony Kaspi
- a Epigenetics in Human Health and Disease Laboratory ; Baker IDI Heart and Diabetes Institute ; The Alfred Medical Research and Education Precinct ; Melbourne , Victoria , Australia
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Kasacka I, Piotrowska Ż, Janiuk I. Influence of renovascular hypertension on the distribution of vasoactive intestinal peptide in the stomach and heart of rats. Exp Biol Med (Maywood) 2015; 240:1402-7. [PMID: 25990439 DOI: 10.1177/1535370215587533] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 04/13/2015] [Indexed: 11/16/2022] Open
Abstract
Arterial hypertension is associated with serious dysfunction of the cardiovascular system and digestive system. Given the relevant role of vasoactive intestinal peptide (VIP) in the regulation of digestion process, control of blood pressure and heart rate as well as cardio- and gastro-protective character of the peptide, it appeared worthwhile to undertake the research aimed at immunohistochemical identification and evaluation of VIP-positive structures in the pylorus and heart of hypertensive rats. Up to now, this issue has not been investigated. The experimental model of hypertension in rats according to Goldblatt (two-kidney one clip model of hypertension) was used in the study. The experimental material (pylorus and heart) was collected in the sixth week of the study. VIP-containing structures were evaluated using immunohistochemical and morphometric methods. The analysis of the results showed a significant increase in the number of immunoreactive VIP structures and in the intensity of immunohistochemical staining in the stomach and in the heart of hypertensive rats. Our findings indicate that VIP is an important regulator of cardiovascular and digestive system in physiological and pathological conditions. However, to better understand the exact role of VIP in hypertension further studies need to be carried out.
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Affiliation(s)
- Irena Kasacka
- Department of Histology and Cytophysiology, Medical University of Bialystok, 15-089 Białystok, Poland
| | - Żaneta Piotrowska
- Department of Histology and Cytophysiology, Medical University of Bialystok, 15-089 Białystok, Poland
| | - Izabela Janiuk
- Department of Dietetics and Food Assessment, Institute of Health Sciences, University of Natural Sciences and Humanities, 08-110 Siedlce, Poland
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Wang K, Song H, Jin M, Xiao H, Zhao G, Zou H, Yu L. Chronic alcohol consumption from adolescence to adulthood in mice--hypothalamic gene expression changes in insulin-signaling pathway. Alcohol 2014; 48:571-8. [PMID: 25088817 DOI: 10.1016/j.alcohol.2014.07.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Adolescence is a developmental stage vulnerable to alcohol drinking-related problems, and alcohol exposure during adolescence may lead to long-lasting consequences. The hypothalamus is a key brain region for food and water intake regulation as well as weight control, and is one of the alcohol-sensitive brain regions. However, it is not known what the alcohol effect is on the hypothalamus following adolescent alcohol intake, chronically over adolescent development, at moderate levels. We employed a model of chronic moderate alcohol intake from adolescence to adulthood in mice, and analyzed the effect of alcohol on growth and weight gain, as well as hypothalamic gene expression patterns. The results indicated that chronic alcohol consumption during adolescence, even at moderate levels, led to both a reduction in weight gain in mice, and considerable gene expression changes in the hypothalamus. Pathway analysis and real-time PCR identified the type II diabetes mellitus and the insulin-signaling pathways as being the hypothalamic pathways affected by chronic alcohol. Our findings from the mouse alcohol consumption study therefore serve as a potential warning against alcohol consumption during adolescence, such as in teens and college students.
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Affiliation(s)
- Ke Wang
- Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China; Shanghai-MOST Key Laboratory of Health and Disease Genomics, Chinese National Human Genome Center at Shanghai and National Engineering Research Center for Biochip at Shanghai, Shanghai, China; Department of Cardiothoracic Surgery, Shu Guang Hospital Affiliated with the Shanghai Traditional Medicine University, Shanghai, China
| | - Huaiguang Song
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, Chinese National Human Genome Center at Shanghai and National Engineering Research Center for Biochip at Shanghai, Shanghai, China
| | - Meilei Jin
- Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Huasheng Xiao
- Shanghai-MOST Key Laboratory of Health and Disease Genomics, Chinese National Human Genome Center at Shanghai and National Engineering Research Center for Biochip at Shanghai, Shanghai, China
| | - Guoping Zhao
- Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China; State Key Laboratory of Genetic Engineering, Department of Microbiology, School of Life Sciences and Institute of Biomedical Sciences, Fudan University, Shanghai, China; Department of Microbiology and Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.
| | - Hong Zou
- Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China; State Key Laboratory of Genetic Engineering, Department of Microbiology, School of Life Sciences and Institute of Biomedical Sciences, Fudan University, Shanghai, China.
| | - Lei Yu
- Department of Genetics & Center of Alcohol Studies, Rutgers University, 607 Allison Road, Piscataway, NJ 08854, USA.
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Abstract
As obesity continues to be a global epidemic, research into the mechanisms of hunger and satiety and how those signals act to regulate energy homeostasis persists. Peptide YY (PYY) is an acute satiety signal released upon nutrient ingestion and has been shown to decrease food intake when administered exogenously. More recently, investigators have studied how different factors influence PYY release and circulating levels in humans. Some of these factors include exercise, macronutrient composition of the diet, body-weight status, adiposity levels, sex, race and ageing. The present article provides a succinct and comprehensive review of the recent literature published on the different factors that influence PYY release and circulating levels in humans. Where human data are insufficient, evidence in animal or cell models is summarised. Additionally, the present review explores the recent findings on PYY responses to different dietary fatty acids and how this new line of research will make an impact on future studies on PYY. Human demographics, such as sex and age, do not appear to influence PYY levels. Conversely, adiposity or BMI, race and acute exercise all influence circulating PYY levels. Both dietary fat and protein strongly stimulate PYY release. Furthermore, MUFA appear to result in a smaller PYY response compared with SFA and PUFA. PYY levels appear to be affected by acute exercise, macronutrient composition, adiposity, race and the composition of fatty acids from dietary fat.
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Abstract
The mouse insulin I promoter (MIP) construct was developed to eliminate the promoter activity detected with the rat insulin II promoter in specific hypothalamic neurons that may have unintended effects on glucose and energy homeostasis in transgenic models. Thus, the specificity of this novel construct must be validated prior to the widespread availability of derived Cre models. Although limited validation efforts have indicated a lack of MIP activity within neuronal tissue, the global immunohistochemical methodology used may not be specific enough to rule out the possibility of specific populations of neurons with MIP activity. To investigate possible MIP activity within the hypothalamus, primary hypothalamic isolates from MIP-green fluorescent protein reporter mice were analyzed after fluorescent-activated cell sorting. Primary hypothalamic neurons isolated from the MIP-green fluorescent protein mice were immortalized. Characterization detected the presence of hypothalamic neuropeptide Y (NPY) and agouti-related peptide, involved in the control of energy homeostasis, as well as confirmed insulin responsiveness in the cell lines. Moreover, because insulin was demonstrated to differentially regulate NPY expression within these MIP neurons, the promoter construct may be active in multiple hypothalamic NPY/agouti-related peptide subpopulations with unique physiological functions. MIP transgenic animals may therefore face similar limitations seen previously with rat insulin II promoter-based models.
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Affiliation(s)
- Zi Chen Wang
- Departments of Physiology (Z.C.W., M.B.W., D.D.B.), Medicine (M.B.W., D.D.B.), and Obstetrics and Gynaecology (D.D.B.), University of Toronto, and Division of Cellular and Molecular Biology (M.B.W., D.D.B.), Toronto General Hospital Research Institute, University Health Network, Toronto, Ontario, Canada M5S 1A8
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Ağbaht K, Erdogan MF, Emral R, Baskal N, Güllü S. Circulating glucagon to ghrelin ratio as a determinant of insulin resistance in hyperthyroidism. Endocrine 2014; 45:106-13. [PMID: 23572405 DOI: 10.1007/s12020-013-9951-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2013] [Accepted: 04/03/2013] [Indexed: 12/13/2022]
Abstract
Due to stimulated overall metabolism, a state of nutritional inadequacy often ensues, during thyrotoxicosis. We aimed to investigate circulating levels of some major components of the system that regulates energy stores, glucose, and fat metabolism, during thyrotoxicosis compared to euthyroidism. Fasting serum ghrelin, leptin, adiponectin, insulin, glucagon, glucose, as well as body fat composition were analyzed during thyrotoxicosis in 40 hyperthyroid patients (50.5 ± 15.2 years old, 22 females, 31 with Graves disease, and 9 with toxic nodular goiter). The same measurements were repeated an average 3 months later, when all patients achieved euthyroidism. Compared to euthyroidism, in thyrotoxicosis, patients had lower ghrelin and fat mass; had comparable insulin, HOMA-IR, glucagon, and leptin levels; higher levels of circulating adiponectin. Fasting serum glucose tended to be higher during thyrotoxicosis. The unique correlation of HOMA-IR was with the-glucagon to ghrelin ratio-(r = 0.801, p < 0.001) in hyperthyrodism, and with glucagon itself in euthyroidism (r = -0.844, p < 0.001). Circulating levels of ghrelin are decreased; leptin, insulin, glucagon are unchanged; adiponectin are increased during hyperthyroidism. The fasting HOMA-IR tends to be higher, despite the decreased adiposity in hyperthyroidism. The-glucagon to ghrelin ratio-strongly correlates with fasting HOMA-IR in hyperthyroidism.
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Affiliation(s)
- Kemal Ağbaht
- Department of Endocrinology and Metabolic Diseases, Faculty of Medicine, Ibn-I Sina Hospital, Ankara University, Sihhiye, Ankara, Turkey,
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Yulyaningsih E, Loh K, Lin S, Lau J, Zhang L, Shi Y, Berning BA, Enriquez R, Driessler F, Macia L, Khor EC, Qi Y, Baldock P, Sainsbury A, Herzog H. Pancreatic polypeptide controls energy homeostasis via Npy6r signaling in the suprachiasmatic nucleus in mice. Cell Metab 2014; 19:58-72. [PMID: 24411939 DOI: 10.1016/j.cmet.2013.11.019] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 10/04/2013] [Accepted: 11/15/2013] [Indexed: 12/29/2022]
Abstract
Y-receptors control energy homeostasis, but the role of Npy6 receptors (Npy6r) is largely unknown. Young Npy6r-deficient (Npy6r(-/-)) mice have reduced body weight, lean mass, and adiposity, while older and high-fat-fed Npy6r(-/-) mice have low lean mass with increased adiposity. Npy6r(-/-) mice showed reduced hypothalamic growth hormone releasing hormone (Ghrh) expression and serum insulin-like growth factor-1 (IGF-1) levels relative to WT. This is likely due to impaired vasoactive intestinal peptide (VIP) signaling in the suprachiasmatic nucleus (SCN), where we found Npy6r coexpressed in VIP neurons. Peripheral administration of pancreatic polypeptide (PP) increased Fos expression in the SCN, increased energy expenditure, and reduced food intake in WT, but not Npy6r(-/-), mice. Moreover, intraperitoneal (i.p.) PP injection increased hypothalamic Ghrh mRNA expression and serum IGF-1 levels in WT, but not Npy6r(-/-), mice, an effect blocked by intracerebroventricular (i.c.v.) Vasoactive Intestinal Peptide (VPAC) receptors antagonism. Thus, PP-initiated signaling through Npy6r in VIP neurons regulates the growth hormone axis and body composition.
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Affiliation(s)
- Ernie Yulyaningsih
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Kim Loh
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Shu Lin
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Jackie Lau
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Lei Zhang
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Yanchuan Shi
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Britt A Berning
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Ronaldo Enriquez
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Frank Driessler
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Laurence Macia
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Ee Cheng Khor
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Yue Qi
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Paul Baldock
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia
| | - Amanda Sainsbury
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia; School of Medical Sciences, Wallace Wurth Building, University of NSW, Botany Street, Sydney 2052, Australia; The Boden Institute of Obesity, Nutrition, Exercise, and Eating Disorders, Sydney Medical School, The University of Sydney, Medical Foundation Building, 92-94 Parramatta Road, Camperdown NSW 2006, Australia
| | - Herbert Herzog
- Neuroscience Program, Garvan Institute of Medical Research, St. Vincent's Hospital, 384 Victoria Street, Darlinghurst, Sydney NSW 2010, Australia; UNSW Medicine, ASGM Building, University of NSW, Botany Street, Sydney 2052, Australia.
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Lukaszewski MA, Butruille L, Moitrot E, Montel V, Dickes-Coopman A, Lesage J, Laborie C, Vieau D, Breton C. The hypothalamic POMC mRNA expression is upregulated in prenatally undernourished male rat offspring under high-fat diet. Peptides 2013; 43:146-54. [PMID: 23523777 DOI: 10.1016/j.peptides.2013.03.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Revised: 03/13/2013] [Accepted: 03/13/2013] [Indexed: 12/31/2022]
Abstract
Epidemiological studies demonstrated that adverse environmental factors leading to intrauterine growth retardation (IUGR) and low birth weight may predispose individuals to increased risk of metabolic syndrome. In rats, we previously demonstrated that adult male IUGR offspring from prenatal 70% food-restricted dams throughout gestation (FR30) were predisposed to energy balance dysfunctions such as impaired glucose intolerance, hyperleptinemia, hyperphagia and adiposity. We investigated whether postweaning moderate high-fat (HF) diet would amplify the phenotype focusing on the hypothalamus gene expression profile. Prenatally undernourished rat offspring were HF-fed from weaning until adulthood while body weight and food intake were measured. Tissue weights, glucose tolerance and plasma endocrine parameters levels were determined in 4-month-old rats. Hypothalamic gene expression profiling of adult FR30 rat was performed using Illumina microarray analysis and the RatRef-12 Expression BeadChip that contains 21,792 rat genes. Under HF diet, contrary to C animals, FR30 rats displayed increased body weight. However, most of the endocrine disorders observed in chow diet-fed adult FR30 were alleviated. We also observed very few gene expression changes in hypothalamus of FR30 rat. Amongst factors involved in hypothalamic energy homeostasis programming system, only the POMC and transthyretin mRNA expression levels were preferentially increased under HF diet. Both elevated gene expression levels may be seen as adaptive mechanisms counteracting against deleterious effects of HF feeding in FR30 animals. This study shows that the POMC gene expression is a key target of long-term developmental programming in prenatally undernourished male rat offspring, specifically within an obesogenic environment.
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Affiliation(s)
- Marie-Amélie Lukaszewski
- Unité Environnement Périnatal et Croissance, UPRES EA 4489, Equipe Dénutritions Maternelles Périnatales, Université Lille-Nord de France, Villeneuve d'Ascq, France
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Tourkantonis I, Kiagia M, Peponi E, Tsagouli S, Syrigos KN. The Role of Leptin in Cancer Pathogenesis. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/jct.2013.42080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ikegami M, Ikeda H, Ohashi T, Kai M, Osada M, Kamei A, Kamei J. Olanzapine-induced hyperglycemia: possible involvement of histaminergic, dopaminergic and adrenergic functions in the central nervous system. Neuroendocrinology 2013; 98:224-32. [PMID: 24135197 DOI: 10.1159/000356119] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Accepted: 09/29/2013] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS Atypical antipsychotic drugs such as olanzapine are known to induce metabolic disturbance. We have already shown that olanzapine induces hepatic glucose production through the activation of hypothalamic adenosine 5'-monophosphate-activated protein kinase (AMPK). However, it is unclear how olanzapine activates hypothalamic AMPK. Since olanzapine is known to antagonize several receptors, including histaminergic, muscarinic, serotonergic, dopaminergic and adrenergic receptors, we examined the effect of each receptor antagonist on blood glucose levels in mice. Moreover, we also investigated whether these antagonists activate hypothalamic AMPK. METHODS Male 6-week-old ICR mice were used. Blood glucose levels were determined by the glucose oxidase method. AMPK expression was measured by Western blotting. RESULTS Central administration of olanzapine (5-15 nmol i.c.v.) dose-dependently increased blood glucose levels in mice, whereas olanzapine did not change blood insulin levels. Histamine H1 receptor antagonist chlorpheniramine (1-10 μg i.c.v.), dopamine D2 receptor antagonist L-sulpiride (1-10 μg i.c.v.) and α1-adrenoceptor antagonist prazosin (0.3-3 μg i.c.v.) also significantly increased blood glucose levels in mice. In contrast, the blood glucose levels were not affected by muscarinic M1 receptor antagonist dicyclomine (1-10 μg i.c.v.) or serotonin 5-HT2A receptor antagonist M100907 (1-10 ng i.c.v.). Olanzapine-induced hyperglycemia was inhibited by the AMPK inhibitor compound C, and AMPK activator AICAR (10 ng to 1 μg i.c.v.) significantly increased blood glucose levels. Olanzapine (15 nmol), chlorpheniramine (10 μg), L-sulpiride (10 μg) and prazosin (3 μg) significantly increased phosphorylated AMPK in the hypothalamus of mice. CONCLUSION These results suggest that olanzapine activates hypothalamic AMPK by antagonizing histamine H1 receptors, dopamine D2 receptors and α1-adrenoceptors, which induces hyperglycemia.
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Affiliation(s)
- Megumi Ikegami
- Department of Pathophysiology and Therapeutics, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Tokyo, Japan
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Falor AE, Zobel M, Kaji A, Neville A, De Virgilio C. Admission variables predictive of gangrenous cholecystitis. Am Surg 2012; 22:1648-57. [PMID: 23025944 DOI: 10.1007/s11695-012-0698-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The objective of the present study was to identify admission clinical factors associated with gangrenous cholecystitis (GC) and factors associated with conversion to open cholecystectomy. We retrospectively evaluated 391 patients over a 17-month period who underwent urgent laparoscopic cholecystectomy for a diagnosis of acute cholecystitis. Eighty-nine patients with pathologically proven GC were compared with 302 patients without GC. On multivariable logistic regression, predictors of GC included male gender, white blood cell count greater than 14,000/mm3, heart rate greater than 90 beats per minute, and sodium 135 mg/dL or less. Conversion rate to open cholecystectomy was 7.9 per cent overall, 4 per cent for non-GC, and 19 per cent for GC (odds ratio, 0.2; 95% confidence interval, 0.1 to 0.4; P<0.00001). Conversion was predicted by increasing number of days to surgery, total bilirubin, and white blood cell count. Complication rate was higher in the GC group (10.1 vs 3.6% in the acute cholecystitis group, P=0.01). The increased rate of conversion observed with surgery delay suggests that early laparoscopic cholecystectomy may be preferable in most patients.
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Affiliation(s)
- Ann E Falor
- Department of Surgery, Harbor-UCLA Medical Center, Torrance, California 90509, USA
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Soliman AT, Yasin M, Kassem A. Leptin in pediatrics: A hormone from adipocyte that wheels several functions in children. Indian J Endocrinol Metab 2012; 16:S577-S587. [PMID: 23565493 PMCID: PMC3602987 DOI: 10.4103/2230-8210.105575] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The protein leptin, a pleiotropic hormone regulates appetite and energy balance of the body and plays important roles in controlling linear growth, pubertal development, cardiovascular function, and immunity. Recent findings in the understanding of the structure, functional roles, and clinical significance of conditions with increased and decreased leptin secretion are summarized. Balance between leptin and other hormones is significantly regulated by nutritional status. This balance influences many organ systems, including the brain, liver, and skeletal muscle, to mediate the essential adaptation process. The aim of this review is to summarize the possible physiological functions of leptin and its signaling pathways during childhood and adolescence including control of food intake, energy regulation, growth and puberty, and immunity. Moreover, its secretion and possible roles in the adaptation process during different disease states (obesity, malnutrition, eating disorders, delayed puberty, congenital heart diseases and hepatic disorders) are discussed. The clinical manifestations and the successful management of patients with genetic leptin deficiency and the application of leptin therapy in other diseases including lipodystrophy, states with severe insulin resistance, and diabetes mellitus are discussed.
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Affiliation(s)
- Ashraf T. Soliman
- Department of Pediatric Endocrinology, Clinical Chemistry, Hamad Medical Center (HMC), Doha-Qatar, HMC, Qatar
- College of Medicine, University of Alexandria, Alexandria, Egypt
| | - Mohamed Yasin
- Department of Hematology, Clinical Chemistry, Hamad Medical Center (HMC), Doha-Qatar, HMC, Qatar
| | - Ahmed Kassem
- College of Medicine, University of Alexandria, Alexandria, Egypt
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El Gawad SSA, El Kenawy F, Mousa AA, Omar AA. Plasma levels of resistin and ghrelin before and after treatment in patients with hyperthyroidism. Endocr Pract 2012; 18:376-81. [PMID: 21742599 DOI: 10.4158/ep11130.or] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
OBJECTIVE To investigate ghrelin and resistin concentrations in patients with hyperthyroidism before and after restoration to a euthyroid state and to correlate the 2 peptides with anthropometric and insulin resistance parameters. METHODS The study included hyperthyroid patients and euthyroid healthy participants as a control group. Hyperthyroid patients were evaluated at the start of the study and after normalization of thyroid function with appropriate antithyroid drugs. Anthropometric parameters, insulin resistance parameters (fasting blood glucose, fasting insulin, and homeostasis model assessment-insulin resistance), thyroid function tests, and measurement of ghrelin and resistin were assessed in patients and control participants. RESULTS The study included 40 hyperthyroid patients (32 women and 8 men, aged 26-42 years) and 30 euthyroid healthy participants (20 women and 10 men, aged 25-43 years) as a control group. In hyperthyroid patients, serum resistin levels and insulin resistance parameters were higher and plasma ghrelin levels were lower than in control participants (P<.001), and all normalized after treatment. Ghrelin levels were correlated only with insulin resistance parameters, but no correlations with any anthropometric or laboratory data were found. Resistin levels did not correlate with any clinical or laboratory data of hyperthyroid patients. CONCLUSION In hyperthyroid patients, resistin was increased and ghrelin was decreased, they were not related to anthropometric parameters, and they normalized after treatment of hyperthyroidism.
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Butruille L, Mayeur S, Duparc T, Knauf C, Moitrot E, Fajardy I, Valet P, Storme L, Deruelle P, Lesage J. Prenatal fasudil exposure alleviates fetal growth but programs hyperphagia and overweight in the adult male rat. Eur J Pharmacol 2012; 689:278-84. [PMID: 22683867 DOI: 10.1016/j.ejphar.2012.05.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 05/21/2012] [Accepted: 05/24/2012] [Indexed: 11/26/2022]
Abstract
Numerous data indicate that Rho kinase inhibitors, such as Fasudil, may constitute a novel therapy for cardiovascular and metabolic diseases. We evaluated long-term effects of exposure to Fasudil during late gestation (10 mg/day) in male rat offspring from birth until 9 months. We also analyzed its effects in offspring from hypertensive mothers treated with a nitric oxide synthesis inhibitor (L-NAME; 50 mg/day). Prenatal exposure to Fasudil did not affect birth weight, but increased body weight from postnatal day 7 (P7) to 9 months. In intrauterine growth-restricted (IUGR) fetuses exposed to L-NAME, maternal Fasudil treatment increased birth weight. At P42 and P180, rats exposed to Fasudil and L-NAME showed alterations of their food intake as well as an increased basal glycemia associated with mild glucose intolerance at 6 months which was also observed in Fasudil-exposed rats. In 9 month-old rats, exposure to Fasudil increased the daily food intake as well as hypothalamic mRNA level of the orexigenic NPY peptide without modulation of the anorexigenic POMC gene expression. Altogether, our data suggest that prenatal Fasudil exposure alleviates fetal growth in IUGR rats, but programs long-term metabolic disturbances including transient perturbations of glucose metabolism, a persistent increase of body weight gain, hyperphagia and an augmented expression of hypothalamic NPY orexigenic gene. We postulate that Fasudil treatment during perinatal periods may predispose individuals to the development of metabolic disorders.
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Affiliation(s)
- Laura Butruille
- Univ Lille Nord de France, Unité Environnement Périnatal et Croissance, EA 4489, Faculté de Médecine, Pôle Recherche, Bâtiment SN4, Villeneuve d'Ascq, IFR 114, 59045 Lille, France
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The neuropeptide Y system: Pathophysiological and therapeutic implications in obesity and cancer. Pharmacol Ther 2011; 131:91-113. [DOI: 10.1016/j.pharmthera.2011.03.011] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2011] [Accepted: 03/07/2011] [Indexed: 12/28/2022]
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Lau SM, Lin S, Stokes RA, Cheng K, Baldock PA, Enriquez RF, McLean M, Cheung NW, Sainsbury A, Gonzalez FJ, Herzog H, Gunton JE. Synergistic effects of genetic beta cell dysfunction and maternal glucose intolerance on offspring metabolic phenotype in mice. Diabetologia 2011; 54:910-21. [PMID: 21181398 PMCID: PMC6594150 DOI: 10.1007/s00125-010-1998-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Accepted: 11/08/2010] [Indexed: 01/08/2023]
Abstract
AIMS/HYPOTHESIS Diabetes in pregnancy is linked to development of obesity in the offspring, but the mechanisms are not fully understood. Gestational diabetes mellitus (GDM) occurs when beta cells are unable to compensate for the normal insulin resistance of late pregnancy. In this study, we used a murine model of beta cell dysfunction to examine the effects of maternal GDM on phenotype in male offspring with and without an inherited predisposition for beta cell dysfunction. METHODS Beta cell-specific aryl-hydrocarbon receptor nuclear translocator-null (βArnt) mice develop GDM from beta cell dysfunction. βArnt and control female mice were used to induce GDM and non-diabetic pregnancies, respectively. RESULTS Offspring from GDM pregnancies became spontaneously obese on a normal-chow diet. They were heavier than offspring from non-diabetic pregnancies, with increased body fat. Respiratory exchange ratio (RER) was higher, indicating decreased capacity to switch to lipid oxidation. Metabolic rate in GDM offspring was decreased prior to onset of obesity. The phenotype was more pronounced in βArnt GDM offspring than in GDM offspring of control genotype, demonstrating an interaction between genotype and pregnancy exposure. βArnt GDM offspring had increased hypothalamic neuropeptide Y (Npy) and decreased pro-opiomelanocortin (Pomc) expression. Weight, body fat, insulin sensitivity and RER in all mice, and hypothalamic Npy in βArnt mice were significantly correlated with AUC of maternal late pregnancy glucose tolerance tests (p < 0.01), but not with litter size, maternal weight, triacylglycerol or pre-pregnancy glycaemia. CONCLUSIONS/INTERPRETATION In βArnt mice, exposure to GDM and inheritance of genetic beta cell dysfunction had additive effects on male offspring obesity; severity of the offspring phenotype correlated with maternal glycaemia.
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Affiliation(s)
- S M Lau
- Diabetes and Transcription Factors Group, Garvan Institute of Medical Research, 384 Victoria St, Darlinghurst, NSW, Australia
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Cooper JA, Watras AC, Paton CM, Wegner FH, Adams AK, Schoeller DA. Impact of exercise and dietary fatty acid composition from a high-fat diet on markers of hunger and satiety. Appetite 2010; 56:171-8. [PMID: 21035513 DOI: 10.1016/j.appet.2010.10.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Revised: 09/14/2010] [Accepted: 10/21/2010] [Indexed: 01/12/2023]
Abstract
To compare the effects of both dietary fatty acid composition and exercise vs. sedentary conditions on circulating levels of hunger and satiety hormones. Eight healthy males were randomized in a 2 × 2 crossover design. The four treatments were 3 days of HF diets (50% of energy) containing high saturated fat (22% of energy) with exercise (SE) or sedentary (SS) conditions, and high monounsaturated fat (30% of energy) with exercise (UE) or sedentary (US) conditions. Cycling exercise was completed at 45% of VO(2)max for 2h daily. On the third HF day, 20 blood samples were drawn over a 24h period for each hormone (leptin, insulin, ghrelin, and peptide YY (PYY)). A visual analog scale (VAS) was completed hourly between 0800 and 2200. Average 24h leptin and insulin levels were lower while 24h PYY was higher during exercise vs. sedentary conditions. FA composition did not differentially affect 24h hormone values. VAS scores for hunger and fullness did not differ between any treatment but did correlate with ghrelin, leptin, and insulin. High saturated or unsaturated fat diets did not differ with respect to markers of hunger or satiety. Exercise decreased 24h leptin and insulin while increasing PYY regardless of FA composition.
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Affiliation(s)
- J A Cooper
- Department of Nutrition, Hospitality, and Retailing, Texas Tech University, PO Box 41240, Lubbock, TX 79409, USA
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[Advances in pathophysiological concepts of obesity]. Presse Med 2010; 39:907-12. [PMID: 20663632 DOI: 10.1016/j.lpm.2010.05.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2009] [Revised: 05/11/2010] [Accepted: 05/12/2010] [Indexed: 11/24/2022] Open
Abstract
Obesity is defined as an increase in fat mass, which reflects the inefficiency of the system regulating energy homeostasis to resist against the pressure of environmental and genetic factors. Obesity constitutes itself into several phases to reach a real pathology of adipose tissue, seat of large functional alterations. There is a continuum of obesity forms, from purely genetic forms to purely environmental forms. Within this continuum, genetic and environmental determinants interaction is the rule. The role of gut flora has become a new interesting line of research in the pathophysiology of obesity.
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Molecular mechanisms of early life stress—Lessons from mouse models. Neurosci Biobehav Rev 2010; 34:845-52. [DOI: 10.1016/j.neubiorev.2009.05.002] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 03/23/2009] [Accepted: 05/05/2009] [Indexed: 11/22/2022]
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Cubero I, Navarro M, Carvajal F, Lerma-Cabrera JM, Thiele TE. Ethanol-induced increase of agouti-related protein (AgRP) immunoreactivity in the arcuate nucleus of the hypothalamus of C57BL/6J, but not 129/SvJ, inbred mice. Alcohol Clin Exp Res 2010; 34:693-701. [PMID: 20102560 DOI: 10.1111/j.1530-0277.2009.01138.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND The melanocortin (MC) system is composed of peptides that are cleaved from the polypeptide precursor, pro-opiomelanocortin (POMC). Previous research has shown that MC receptor (MCR) agonists reduce, and MCR antagonists increase, ethanol consumption in rats and mice. Consistently, genetic deletion of the endogenous MCR antagonist, agouti-related protein (AgRP), causes reductions of ethanol-reinforced lever pressing and binge-like ethanol drinking in C57BL/6J mice. Ethanol also has direct effects on the central MC system, as chronic exposure to an ethanol-containing diet causes significant reductions of alpha-melanocyte stimulating hormone (alpha-MSH) immunoreactivity in specific brain regions of Sprague-Dawley rats. Together, these observations suggest that the central MC system modulates neurobiological responses to ethanol. To further characterize the role of the MC system in responses to ethanol, here we compared AgRP and alpha-MSH immunoreactivity in response to an acute injection of saline or ethanol between high ethanol drinking C57BL/6J mice and moderate ethanol drinking 129/SvJ mice. METHODS Mice received an intraperitoneal (i.p.) injection of ethanol (1.5 g/kg or 3.5 g/kg; mixed in 0.9% saline) or an equivolume of 0.9% saline. Two hours after injection, animals were sacrificed and their brains were processed for AgRP and alpha-MSH immunoreactivity. RESULTS Results indicated that acute ethanol administration triggered a dose-dependent increase in AgRP immunoreactivity in the arcuate (ARC) of C57BL/6J mice, an effect that was not evident in the 129/SvJ strain. Although acute administration of ethanol did not influence alpha-MSH immunoreactivity, C57BL/6J mice had significantly greater overall alpha-MSH immunoreactivity in the ARC, dorsomedial, and lateral regions of the hypothalamus relative to the 129/SvJ strain. In contrast, C57BL/6J mice displayed significantly lower alpha-MSH immunoreactivity in the medial amygdala. CONCLUSIONS The results show that acute ethanol exposure has direct effects on endogenous AgRP activity in ethanol preferring C57BL/6J mice. It is suggested that ethanol-induced increases in AgRP may be part of a positive feedback system that stimulates excessive binge-like ethanol drinking in C57BL/6J mice. Inherent differences in alpha-MSH immunoreactivity may contribute to differences in neurobiological responses to ethanol that are characteristically observed between the C57BL/6J and 129/SvJ inbred strains of mice.
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Affiliation(s)
- Inmaculada Cubero
- Department of Neurociencia y Ciencias de la Salud, University of Almería, Almería, Spain
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Imam SS, Kandil ME, Shoman M, Baker SI, Bahier R. Umbilical cord ghrelin in term and preterm newborns and its relation to metabolic hormones and anthropometric measurements. Pak J Biol Sci 2009; 12:1548-1555. [PMID: 20334115 DOI: 10.3923/pjbs.2009.1548.1555] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The aim of the study was to assess umbilical cord ghrelin level in term and preterm newborns and its relation to other metabolic hormones and anthropometric measurements. A cross sectional comparative study included 50 normal appropriate-for-gestational-age newborns (25 full-terms; 25 preterm). Assessment of anthropometric measurements, cord levels of ghrelin, leptin, insulin and glucose were done to all newborns. Umbilical cord ghrelin was detected in all newborns. There was no significant difference between term and preterm groups regarding ghrelin, insulin and glucose. Leptin was significantly lower in preterm than term group. Sex and mode of delivery had no effects regarding all studied variables. There was no overall correlation between ghrelin and gestational age, anthropometric measurements, leptin, insulin or glucose in all newborns. Preterm group demonstrated significant correlations between ghrelin and weight, body mass index and abdominal circumference. An overall significant correlation was found between leptin and gestational age and anthropometric measurements in all newborns. In preterm group leptin correlated with weight, length, subscapular skin-fold thickness and abdominal circumference. To conclude the umbilical cord ghrelin was relatively invariable at birth between 30 and 41 weeks gestation showing no gestational age-related variation, unlike leptin, which was lower in preterm group indicating increased adipose mass and placental maturation with increased gestational age.
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Affiliation(s)
- Safaa S Imam
- Department of Pediatrics, Ain Shams University, Cairo, Egypt
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Abstract
Desde o descobrimento da leptina, avanços consideráveis foram obtidos na caracterização dos mecanismos hipotalâmicos do controle da ingestão alimentar e, atualmente, a oxintomodulina é reconhecida como um regulador da homeostase energética. O presente artigo de revisão enfoca algumas das mais relevantes inter-relações do hormônio oxintomodulina com o apetite, a homeostase energética e aspectos de seu papel na bioquímica e fisiologia nutricional. A oxintomodulina é um peptídeo intestinal anorexígeno produzido pelas células L do intestino. Recentes estudos têm demonstrado que em longo prazo a administração de oxintomodulina reduz a ingestão alimentar e o ganho de peso. Pesquisas em humanos têm verificado que o seu uso reduz o consumo energértico em 25%. Portanto, a oxintomodulina representa uma potente terapia anti-obesidade. Entretanto, o mecanismo de ação da oxintomodulina ainda é desconhecido. Atuais evidências sugerem que tem ação via receptor do peptídeo semelhante ao glucagon 1. Além disso, a literatura mostra que, juntamente com a adoção de hábitos saudáveis e a mudança do estilo de vida, a oxintomodulina pode proporcionar menor avanço da obesidade.
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Abstract
BACKGROUND Increased incidence of cardiovascular mortality and nonalcoholic fatty liver disease (NAFLD) has been reported in hypopituitarism, but previous studies did not correct for obesity in these patients. Therefore, it remained unclear if endocrine deficiency in hypopituitarism is associated with metabolic consequences independent of obesity. This study was designed to determine the burden of cardiovascular disease and NAFLD in hypopituitarism. METHODS We performed a retrospective case-control analysis of hypopituitary patients at Veterans Affair Medical center, Memphis, from January 1997 to June 2007. After matching for age, gender, obesity, and race, relevant data were abstracted from the subjects' records to determine the presence of hypopituitarism, cardiovascular risk factors, and fatty liver disease. Cases and controls were characterized by descriptive statistics and compared using chi(2) and Student t tests. RESULTS Hypopituitary patients exhibited higher prevalence of hypertension- 88% versus 78% (P < 0.03), hypertriglyceridemia-80% versus 70% (P = 0.05), low high-density lipoprotein cholesterol-84% versus 70% (P < 0.001), and metabolic syndrome-90% versus 71% (P < 0.001). Patients also had higher mean plasma glucose levels-228 +/- 152 versus 181 +/- 83 mg/dL (P < 0.01). Despite higher preponderance of cardiovascular risk factors in hypopituitary patients, prevalence of cardiovascular morbidity was similar in both groups (P > 0.3). Hypopituitary patients had higher elevations in serum aminotransferase levels and hyperbilirubinemia-24% versus 11% (P < 0.01), as well as higher international normalized ratio (INR) and hypoalbuminemia 40% versus 23% (P < 0.01). CONCLUSIONS There is an increased prevalence of metabolic syndrome and liver dysfunction consistent with NAFLD in hypopituitarism. Although hypopituitary patients had higher prevalence of cardiovascular risk factors than controls, they were not disproportionately affected by cardiovascular disease.
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Carlson JJ, Turpin AA, Wiebke G, Hunt SC, Adams TD. Pre- and post- prandial appetite hormone levels in normal weight and severely obese women. Nutr Metab (Lond) 2009; 6:32. [PMID: 19671157 PMCID: PMC2731765 DOI: 10.1186/1743-7075-6-32] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2008] [Accepted: 08/11/2009] [Indexed: 12/22/2022] Open
Abstract
Background Appetite is affected by many factors including the hormones leptin, ghrelin and adiponectin. Ghrelin stimulates hunger, leptin promotes satiety, and adiponectin affects insulin response. This study was designed to test whether the pre- and postprandial response of key appetite hormones differs in normal weight (NW) and severely obese (SO) women. Methods Twenty three women ages 25–50 were recruited for this study including 10 NW (BMI = 23.1 ± 1.3 kg/m2) and 13 SO (BMI = 44.5 ± 7.1 kg/m2). The study was conducted in a hospital-based clinical research centre. Following a 12-hour fast, participants had a baseline blood draw, consumed a moderately high carbohydrate meal (60% carbohydrate, 20% protein, 20% fat) based on body weight. Postprandially, participants had six blood samples drawn at 0, 15, 30, 60, 90, and 120 minutes. Primary measures included pre- and post-prandial total ghrelin, leptin, adiponectin and insulin. A repeated measures general linear model was used to evaluate the hormone changes by group and time (significance p ≤ 0.05). Results There were significant differences between the NW and the SO for all hormones in the preprandial fasting state. The postprandial responses between the SO versus NW revealed: higher leptin (p < 0.0001), lower adiponectin (p = 0.04), trend for lower ghrelin (p = 0.06) and insulin was not different (p = 0.26). Postprandial responses over time between the SO versus NW: higher leptin (p < 0.001), lower ghrelin and adiponectin (p = 0.004, p = 0.015, respectively), and trend for higher insulin (p = 0.06). Conclusion This study indicates that significant differences in both pre- and selected post- prandial levels of leptin, ghrelin, adiponectin and insulin exist between NW and SO women. Improving our understanding of the biochemical mechanisms accounting for these differences in appetite hormones among individuals with varying body size and adiposity should aid in the development of future therapies to prevent and treat obesity.
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Affiliation(s)
- Joseph J Carlson
- Division of Nutrition, University of Utah, HPER North Room 213, SLC, UT 84112, USA.
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Nedungadi TP, Clegg DJ. Sexual dimorphism in body fat distribution and risk for cardiovascular diseases. J Cardiovasc Transl Res 2009; 2:321-7. [PMID: 20560019 DOI: 10.1007/s12265-009-9101-1] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2009] [Accepted: 03/24/2009] [Indexed: 12/28/2022]
Abstract
The prevalence of obesity has dramatically increased over the past decade along with the cardiovascular and other health risks it encompasses. Adipose tissue, which is distributed in the abdominal viscera, carries a greater risk for cardiovascular disorders than adipose tissue subcutaneously. There is a sex difference in the regional fat distribution. Women have more subcutaneous fat, whereas men have more visceral fat. Therefore, obesity-related metabolic disorders are much lower in premenopausal women than men. Peripheral metabolic signals like leptin and insulin are involved in the food intake, body weight, body fat distribution, and cardiovascular disease. Key areas in the brain, including the hypothalamus, integrates these peripheral adiposity signals to maintain overall adiposity levels, and these brain regions are directly influenced by sex hormones. Therefore, differences in cardiovascular disease may be under the influence of sex hormones either directly in the brain or through their influence of body fat distribution. The role of estrogen in mediating body fat distribution and cardiovascular disease is the focus of this review.
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Affiliation(s)
- Thekkethil P Nedungadi
- Department of Internal Medicine, Touchstone Diabetes Center, UT Southwestern Medical Center, 5323 Harry Hines Blvd., K5.252, Dallas, TX 75390-8854, USA
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Breton C, Lukaszewski MA, Risold PY, Enache M, Guillemot J, Rivière G, Delahaye F, Lesage J, Dutriez-Casteloot I, Laborie C, Vieau D. Maternal prenatal undernutrition alters the response of POMC neurons to energy status variation in adult male rat offspring. Am J Physiol Endocrinol Metab 2009; 296:E462-72. [PMID: 19088253 DOI: 10.1152/ajpendo.90740.2008] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Epidemiological studies suggest that maternal undernutrition predisposes the offspring to development of energy balance metabolic pathologies in adulthood. Using a model of a prenatal maternal 70% food-restricted diet (FR30) in rats, we evaluated peripheral parameters involved in nutritional regulation, as well as the hypothalamic appetite-regulatory system, in nonfasted and 48-h-fasted adult offspring. Despite comparable glycemia in both groups, mild glucose intolerance, with a defect in glucose-induced insulin secretion, was observed in FR30 animals. They also exhibited hyperleptinemia, despite similar visible fat deposits. Using semiquantitative RT-PCR, we observed no basal difference of hypothalamic proopiomelanocortin (POMC) and neuropeptide Y (NPY) gene expression, but a decrease of the OB-Rb and an increase of insulin receptor mRNA levels, in FR30 animals. These animals also exhibited basal hypercorticosteronemia and a blunted increase of corticosterone in fasted compared with control animals. After fasting, FR30 animals showed no marked reduction of POMC mRNA levels or intensity of beta-endorphin-immunoreactive fiber projections. By contrast, NPY gene expression and immunoreactive fiber intensity increased. FR30 rats also displayed subtle alterations of food intake: body weight-related food intake was higher and light-dark phase rhythm and refeeding time course were modified after fasting. At rest, in the morning, hyperinsulinemia and a striking increase in the number of c-Fos-containing cells in the arcuate nucleus were observed. About 30% of the c-Fos-expressing cells were POMC neurons. Our data suggest that maternal undernutrition differently programs the long-term appetite-regulatory system of offspring, especially the response of POMC neurons to energy status and food intake rhythm.
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Affiliation(s)
- Christophe Breton
- Neurosciences et Physiologie Adaptatives, Université de Lille I, Villeneuve d'Ascq, France.
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