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Ozcan M, Ayar A. Endocrine Aspects of Pain Pathophysiology: Focus on Adipose Tissue. Neuroendocrinology 2024; 114:894-906. [PMID: 38801814 DOI: 10.1159/000539531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Accepted: 05/21/2024] [Indexed: 05/29/2024]
Abstract
BACKGROUND Multiple factors, including neurobiological, hormonal, psychological, and social/cultural norms, influence the manner in which individuals experience pain. Adipose tissue, once considered solely an energy storage site, has been recognized as a significant endocrine organ that produces and releases a range of hormones and cytokines. In recent years, research has highlighted the role of adipose tissue and its endocrine factors in the pathophysiology of pain. SUMMARY This narrative review aimed to provide a comprehensive overview of the current knowledge on the endocrine aspects of pain pathophysiology, with a specific focus on adipose tissue. We examine the role of adipokines released by adipose tissue, such as leptin, adiponectin, resistin, visfatin, asprosin in pain perception and response. We also explore the clinical implications of these findings, including the potential for personalized pain management based on endocrine factors and adipose tissue. KEY MESSAGES Overall, given this background, this review intended to highlight the importance of understanding the endocrine aspects of pain pathophysiology, particularly focusing on the role of adipose tissue, in the development of chronic pain and adipokines. Better understanding the role of adipokines in pain modulation might have therapeutic implications by providing novel targets for addressing underlying mechanism rather than directly focusing on symptoms for chronic pain, particularly in obese individuals.
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Affiliation(s)
- Mete Ozcan
- Department of Biophysics, Firat University Medical Faculty, Elazig, Turkey
| | - Ahmet Ayar
- Department of Physiology, Karadeniz Technical University Medical Faculty, Trabzon, Turkey
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Gao SJ, Liu DQ, Li DY, Sun J, Zhang LQ, Wu JY, Song FH, Zhou YQ, Mei W. Adipocytokines: Emerging therapeutic targets for pain management. Biomed Pharmacother 2022; 149:112813. [PMID: 35279597 DOI: 10.1016/j.biopha.2022.112813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 03/04/2022] [Accepted: 03/08/2022] [Indexed: 11/15/2022] Open
Abstract
Although pain has lower mortality rates than cancer, diabetes and stroke, pain is a predominate source of distress and disability. However, the management of pain remains an enormous problem. Many drugs used to pain treatment have more or less side effects. Therefore, the development of novel therapeutic target is critical for the treatment of pain. Notably, studies have shown that adipocytokines have a dual role in pain. Growing shreds of evidence shows that the levels of adipocytokines are upregulated or downregulated in the development of pain. In addition, substantial evidence indicates that regulation of adipocytokines levels in models of pain attenuates or promotes pain behaviors. In this review, we summarized and discussed the effect of adipocytokines in pain. These evidence indicates that adipocytokines attenuate or promote pain behaviors through interacting with their receptors, activating serotonin pathway, interacting with μ-opioid receptor, activating microglia, infiltrating macrophage and so on. Overall, adipocytokines have some potential in treating pain, but the underlying mechanisms remain unclear and need to be further studied.
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Affiliation(s)
- Shao-Jie Gao
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China
| | - Dai-Qiang Liu
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China
| | - Dan-Yang Li
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China
| | - Jia Sun
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China
| | - Long-Qing Zhang
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China
| | - Jia-Yi Wu
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China
| | - Fan-He Song
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China
| | - Ya-Qun Zhou
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China.
| | - Wei Mei
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430000, China.
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The postnatal leptin surge in mice is variable in both time and intensity and reflects nutritional status. Int J Obes (Lond) 2022; 46:39-49. [PMID: 34475504 PMCID: PMC8748198 DOI: 10.1038/s41366-021-00957-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 07/27/2021] [Accepted: 08/20/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND/OBJECTIVES The murine postnatal leptin surge occurs within the first 4 weeks of life and is critical for neuronal projection development within hypothalamic feeding circuits. Here we describe the influence of nutritional status on the timing and magnitude of the postnatal leptin surge in mice. METHODS Plasma leptin concentrations were measured 1-3 times per week for the first 4 weeks of life in C57BL/6J pups reared in litters adjusted to 3 (small), 7-8 (normal), or 11-12 (large) pups per dam fed breeder chow or raised in litters of 7-8 by dams fed high-fat diet (HFD) ad libitum starting either prior to conception or at parturition. RESULTS Mice raised in small litters become fatter than pups raised in either normal or large litters. The leptin surge in small litter pups starts earlier, lasts longer, and is dramatically larger in magnitude compared to normal litter pups, even when leptin concentrations are normalized to fat mass. In mice reared in large litters, weight gain is diminished and the surge is both significantly delayed and lower in magnitude compared to control pups. Pups reared by HFD-fed dams (starting preconception or at parturition) are fatter and have augmented leptin surge magnitude compared to pups suckled by chow-fed dams. Surge timing varies depending upon nutritional status of the pup; the source of the surge is primarily subcutaneous adipose tissue. At peak leptin surge, within each group, fat mass and plasma leptin are uncorrelated; in comparison with adults, pups overproduce leptin relative to fat mass. Plasma leptin elevation persists longer than previously described; at postnatal day 27 mice continue overproducing leptin relative to fat mass. CONCLUSIONS In mice, small litter size and maternal HFD feeding during the perinatal period augment the plasma leptin surge whereas large litter size is associated with a delayed surge of reduced magnitude.
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Mallardo M, Ferraro S, Daniele A, Nigro E. GDM-complicated pregnancies: focus on adipokines. Mol Biol Rep 2021; 48:8171-8180. [PMID: 34652617 PMCID: PMC8604848 DOI: 10.1007/s11033-021-06785-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 09/15/2021] [Indexed: 12/27/2022]
Abstract
Gestational diabetes mellitus (GDM) is a serious complication of pregnancy and is defined as a state of glucose intolerance that is first diagnosed and arises during gestation. Although the pathophysiology of GDM has not yet been thoroughly clarified, insulin resistance and pancreatic β-cell dysfunction are considered critical components of its etiopathogenesis. To sustain fetus growth and guarantee mother health, many significant changes in maternal metabolism are required in normal and high-risk pregnancy accompanied by potential complications. Adipokines, adipose tissue-derived hormones, are proteins with pleiotropic functions including a strong metabolic influence in physiological conditions and during pregnancy too. A growing number of studies suggest that various adipokines including adiponectin, leptin, visfatin, resistin and tumor necrosis factor α (TNF-α) are dysregulated in GDM and might have pathological significance and a prognostic value in this pregnancy disorder. In this review, we will focus on the current knowledge on the role that the aforementioned adipokines play in the development and progression of GDM.
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Affiliation(s)
- Marta Mallardo
- Dipartimento di Scienze e Tecnologie Ambientali Biologiche Farmaceutiche, Università degli Studi della Campania "Luigi Vanvitelli", Via G. Vivaldi 42, 81100, Caserta, Italy
- CEINGE-Biotecnologie Avanzate S.c.a r.l., Via G. Salvatore 486, 80145, Naples, Italy
| | - Sara Ferraro
- CEINGE-Biotecnologie Avanzate S.c.a r.l., Via G. Salvatore 486, 80145, Naples, Italy
- Dipartimento di Sanità Pubblica, Università degli Studi di Napoli "Federico II", Via Pansini 5, 80145, Naples, Italy
| | - Aurora Daniele
- CEINGE-Biotecnologie Avanzate S.c.a r.l., Via G. Salvatore 486, 80145, Naples, Italy
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Naples "Federico II", Naples, Italy
| | - Ersilia Nigro
- Dipartimento di Scienze e Tecnologie Ambientali Biologiche Farmaceutiche, Università degli Studi della Campania "Luigi Vanvitelli", Via G. Vivaldi 42, 81100, Caserta, Italy.
- CEINGE-Biotecnologie Avanzate S.c.a r.l., Via G. Salvatore 486, 80145, Naples, Italy.
- CEINGE-Biotecnologie Avanzate, Via Gaetano Salvatore, 486, 80145, Naples, Italy.
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Long-lived weight-reduced αMUPA mice show higher and longer maternal-dependent postnatal leptin surge. PLoS One 2017; 12:e0188658. [PMID: 29190757 PMCID: PMC5708666 DOI: 10.1371/journal.pone.0188658] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 11/10/2017] [Indexed: 12/20/2022] Open
Abstract
We investigated whether long-lived weight-reduced αMUPA mice differ from their wild types in postnatal body composition and leptin level, and whether these differences are affected by maternal-borne factors. Newborn αMUPA and wild type mice had similar body weight and composition up to the third postnatal week, after which αMUPA mice maintained lower body weight due to lower fat-free mass. Both strains showed a surge in leptin levels at the second postnatal week, initiating earlier in αMUPA mice, rising higher and lasting longer than in the wild types, mainly in females. Leptin level in dams' serum and breast milk, and in their pup's stomach content were also higher in αMUPA than in the WT during the surge peak. Leptin surge preceded the strain divergence in body weight, and was associated with an age-dependent decrease in the leptin:fat mass ratio-suggesting that postnatal sex and strain differences in leptin ontogeny are strongly influenced by processes independent of fat mass, such as production and secretion, and possibly outside fat tissues. Dam removal elevated corticosterone level in female pups from both strains similarly, yet mitigated the leptin surge only in αMUPA-eliminating the strain differences in leptin levels. Overall, our results indicate that αMUPA's postnatal leptin surge is more pronounced than in the wild type, more sensitive to maternal deprivation, less related to pup's total adiposity, and is associated with a lower post-weaning fat-free mass. These strain-related postnatal differences may be related to αMUPA's higher milk-borne leptin levels. Thus, our results support the use of αMUPA mice in future studies aimed to explore the relationship between maternal (i.e. milk-borne) factors, postnatal leptin levels, and post-weaning body composition and energy homeostasis.
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Arpón A, Riezu-Boj JI, Milagro FI, Marti A, Razquin C, Martínez-González MA, Corella D, Estruch R, Casas R, Fitó M, Ros E, Salas-Salvadó J, Martínez JA. Adherence to Mediterranean diet is associated with methylation changes in inflammation-related genes in peripheral blood cells. J Physiol Biochem 2017; 73:445-455. [PMID: 28181167 DOI: 10.1007/s13105-017-0552-6] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 01/23/2017] [Indexed: 12/14/2022]
Affiliation(s)
- A Arpón
- Department of Nutrition, Food Sciences and Physiology, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain
- Centre for Nutrition Research, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain
| | - J I Riezu-Boj
- Department of Nutrition, Food Sciences and Physiology, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain
- Centre for Nutrition Research, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain
- Navarra Institute for Health Research (IdiSNa), Pamplona, Spain
| | - F I Milagro
- Department of Nutrition, Food Sciences and Physiology, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain
- Centre for Nutrition Research, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
| | - A Marti
- Department of Nutrition, Food Sciences and Physiology, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain
- Navarra Institute for Health Research (IdiSNa), Pamplona, Spain
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
| | - C Razquin
- Navarra Institute for Health Research (IdiSNa), Pamplona, Spain
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
- Department of Preventive Medicine and Public Health, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain
| | - M A Martínez-González
- Navarra Institute for Health Research (IdiSNa), Pamplona, Spain
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
- Department of Preventive Medicine and Public Health, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain
| | - D Corella
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
- Department of Preventive Medicine and Public Health, University of Valencia, Valencia, Spain
| | - R Estruch
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
- Department of Endocrinology and Nutrition, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Hospital Clinic, University of Barcelona, Barcelona, Spain
| | - R Casas
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
- Department of Endocrinology and Nutrition, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Hospital Clinic, University of Barcelona, Barcelona, Spain
| | - M Fitó
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
- Cardiovascular and Nutrition Research Group, Institut de Reçerca Hospital del Mar, Barcelona, Spain
| | - E Ros
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
- Department of Endocrinology and Nutrition, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Hospital Clinic, University of Barcelona, Barcelona, Spain
| | - J Salas-Salvadó
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain
- Human Nutrition Department, Hospital Universitari Sant Joan, Institut d'Investigació Sanitaria Pere Virgili, Universitat Rovira i Virgili, Reus, Spain
| | - J A Martínez
- Department of Nutrition, Food Sciences and Physiology, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain.
- Centre for Nutrition Research, Universidad de Navarra, Irunlarrea 1, 31009, Pamplona, Spain.
- Navarra Institute for Health Research (IdiSNa), Pamplona, Spain.
- Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERobn), Institute of Health Carlos III, Madrid, Spain.
- Madrid Institute of Advance Studies (IMDEA), IMDEA Food, Madrid, Spain.
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Jacobs A, Warda A, Verbeek J, Cassiman D, Spincemaille P. An Overview of Mouse Models of Nonalcoholic Steatohepatitis: From Past to Present. ACTA ACUST UNITED AC 2016; 6:185-200. [DOI: 10.1002/cpmo.3] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Ans Jacobs
- Department of Hepatology, University Hospitals KU Leuven Leuven Belgium
| | - Anne‐Sophie Warda
- Department of Hepatology, University Hospitals KU Leuven Leuven Belgium
| | - Jef Verbeek
- Department of Hepatology, University Hospitals KU Leuven Leuven Belgium
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Maastricht University Medical Center Maastricht The Netherlands
| | - David Cassiman
- Department of Hepatology, University Hospitals KU Leuven Leuven Belgium
- Metabolic Center, University Hospitals KU Leuven Leuven Belgium
| | - Pieter Spincemaille
- Department of Laboratory Medicine, University Hospitals KU Leuven Leuven Belgium
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Abstract
Suboptimal maternal nutrition exerts lasting impacts on obesity risk in offspring, but the direction of the effect is determined by the timing of exposure. While maternal undernutrition in early pregnancy is associated with increased body mass index, in later pregnancy it can be protective. The importance of the timing of maternal undernutrition is also observed in rodents, however, many of the processes that occur in the last trimester of human gestation are delayed to the postnatal period. Neonatal leptin administration exerts lasting impacts on susceptibility to obesity in rodents. Although leptin can influence the formation of hypothalamic circuits involved in homeostatic control of feeding during the postnatal period, these effects are too late to account for its ability to reverse adverse metabolic programming due to early gestational exposure to maternal undernutrition. This review presents an alternative framework for understanding the effects of neonatal leptin through influences on developing thermoregulatory circuits.
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Interleukin-15 Affects Differentiation and Apoptosis in Adipocytes: Implications in Obesity. Lipids 2011; 46:1033-42. [DOI: 10.1007/s11745-011-3594-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Accepted: 07/06/2011] [Indexed: 02/06/2023]
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D'Asti E, Long H, Tremblay-Mercier J, Grajzer M, Cunnane SC, Di Marzo V, Walker CD. Maternal dietary fat determines metabolic profile and the magnitude of endocannabinoid inhibition of the stress response in neonatal rat offspring. Endocrinology 2010; 151:1685-94. [PMID: 20160134 DOI: 10.1210/en.2009-1092] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Endocannabinoids (eCBs) are products of phospholipid (PL)-derived arachidonic acid (AA) that regulate hypothalamus-pituitary-adrenal axis activity. We hypothesized that differences in the quality and quantity of maternal dietary fat would modulate the PL AA content in the neonatal brain affecting stress responsiveness via differences in eCB production and activity in stress-activated brain areas. Pregnant rats were fed a 5% [control (C)] or 30% fat [high fat (HF)] diet rich in either n-6 (HF-n-6) or n-3 (HF-n-3) fat during the last week of gestation and lactation. Postnatal d 10 offspring were tested for metabolic hormones, AA (n-6) and eCB brain content, and hormonal effects of eCB receptor antagonism (AM251, 1 or 3 mg/kg ip) on stress responses. Like maternal diet, milk from HF-n-3 mothers had a reduced n-6/n-3 fat ratio compared with that of C and HF-n-6 mothers. Hypothalamic and hippocampal levels of PL AA were diet specific, reflecting the maternal milk and dietary n-6/n-3 ratio, with HF-n-3 offspring displaying reduced AA content relative to C and HF-n-6 offspring. Plasma corticosterone and insulin were elevated in HF-fed pups, whereas leptin was increased only in HF-n-6 pups. Basal eCB concentrations were also diet and brain region specific. In C pups, eCB receptor antagonist pretreatment increased stress-induced ACTH secretion, but not in the HF groups. Stress-induced corticosterone secretion was not sensitive to AM251 treatment in HF-n-3 pups. Thus, the nature of preweaning dietary fat differentially influences neonatal metabolic hormones, brain PL AA levels, and eCB, with functional consequences on hypothalamus-pituitary-adrenal axis modulation in developing rat pups.
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Affiliation(s)
- Esterina D'Asti
- Douglas Mental Health University Institute, McGill University, 6875 LaSalle Boulevard, Verdun, Quebec, Canada H4H 1R3
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Guo K, McMinn JE, Ludwig T, Yu YH, Yang G, Chen L, Loh D, Li C, Chua S, Zhang Y. Disruption of peripheral leptin signaling in mice results in hyperleptinemia without associated metabolic abnormalities. Endocrinology 2007; 148:3987-97. [PMID: 17495001 DOI: 10.1210/en.2007-0261] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Although central leptin signaling appears to play a major role in the regulation of food intake and energy metabolism, the physiological role of peripheral leptin signaling and its relative contribution to whole-body energy metabolism remain unclear. To address this question, we created a mouse model (Cre-Tam mice) with an intact leptin receptor in the brain but a near-complete deletion of the signaling domain of leptin receptor in liver, adipose tissue, and small intestine using a tamoxifen (Tam)-inducible Cre-LoxP system. Cre-Tam mice developed marked hyperleptinemia (approximately 4-fold; P < 0.01) associated with 2.3-fold increase (P < 0.05) in posttranscriptional production of leptin. Whereas this is consistent with the disruption of a negative feedback regulation of leptin production in adipose tissue, there were no discernable changes in energy balance, thermoregulation, and insulin sensitivity. Hypothalamic levels of phosphorylated signal transducer and activator of transcription 3, neuropeptide expression, and food intake were not changed despite hyperleptinemia. The percentage of plasma-bound leptin was markedly increased (90.1-96 vs. 41.8-74.7%; P < 0.05), but plasma-free leptin concentrations remained unaltered in Cre-Tam mice. We conclude from these results that 1) the relative contribution to whole-body energy metabolism from peripheral leptin signaling is insignificant in vivo, 2) leptin signaling in adipocyte constitutes a distinct short-loop negative feedback regulation of leptin production that is independent of tissue metabolic status, and 3) perturbation of peripheral leptin signaling alone, although increasing leptin production, may not be sufficient to alter the effective plasma levels of leptin because of the counter-regulatory increase in the level of leptin binding protein(s).
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Affiliation(s)
- Kaiying Guo
- Division of Molecular Genetics, Columbia University, College of Physicians and Surgeons, New York, New York 10032, USA
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Varma A, He J, Shin BC, Weissfeld LA, Devaskar SU. Postnatal intracerebroventricular exposure to leptin causes an altered adult female phenotype. Am J Physiol Endocrinol Metab 2004; 287:E1132-41. [PMID: 15315906 DOI: 10.1152/ajpendo.00228.2004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We investigated the effect of daily intracerebroventricular (ICV) leptin administration (neonatal age 2-7 days) on hypothalamic neuropeptides (neuropeptide Y, alpha-melanocyte-stimulating hormone) that regulate food intake, body weight (BW) gain, and the metabolic/hormonal profile in suckling (8 and 21 days) and adult rat (35, 60, 90, and 120 days). ICV leptin (0.16 mug.g BW(-1).dose(-1); n = 70) led to a postnatal decline in BW (P = 0.0002) that persisted only in the adult females (P = 0.002). The postnatal decline in BW due to leptin was associated with a decline in food intake (P = 0.01) and hypothalamic leptin receptor (P = 0.008) and neuropeptide Y (P = 0.008) immunoreactivities and an increase in alpha-melanocyte-stimulating hormone (P = 0.008) immunoreactivity. In addition, hyperinsulinemia (P = 0.01) with hypocorticosteronemia (P = 0.007) occurred during the postnatal period with hypercorticosteronemia (P = 0.007) and hypoleptinemia (P = 0.008) and an increase in leutinizing hormone (P = 0.01) in the adult male and female progeny. Persistent hyperinsulinemia (P = 0.015) with hyperglycemia (P = 0.008) and glucose intolerance (P = 0.001) were observed only in the adult female. We conclude that postnatal leptin administration alters the adult female phenotype and speculate that this may relate to retention of leptin sensitivity resulting in a lipoatrophic state.
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Affiliation(s)
- Amit Varma
- Divisions of Neonatology and Developmental Biology, Dept. of Pediatrics, David Geffen School of Medicine, University of California-Los Angeles, 10833 LeConte Ave., MDCC-B2-375, Los Angeles, CA 90095-1752, USA
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Kim MS, Namkoong C, Kim HS, Jang PG, Kim Pak YM, Katakami H, Park JY, Lee KU. Chronic central administration of ghrelin reverses the effects of leptin. Int J Obes (Lond) 2004; 28:1264-71. [PMID: 15278100 DOI: 10.1038/sj.ijo.0802647] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To determine whether chronic central administration of ghrelin can block the effects of leptin on food intake, adiposity, and plasma concentrations of metabolic parameters and hormones. DESIGN Intracerebroventricular (ICV) infusions of leptin (5 microg/day) for 7 days, with or without ghrelin (1.2 microg/day), in rats. Rats administered leptin plus ghrelin were divided into ad lib-fed and food-restricted groups. MEASUREMENT Body weight and food intake were monitored daily. Following killing on day 8, epididymal fat weight and fasting plasma concentrations of glucose, insulin, leptin, ghrelin, IGF-1, and adiponectin were determined. RESULTS ICV infusion of leptin decreased food intake by 39% and fat weight by 41%. Leptin decreased plasma concentrations of glucose, insulin, and leptin and increased plasma ghrelin levels. Central coadministration of ghrelin blocked the effects of leptin. Most of the effects of ghrelin were diminished by food restriction but ghrelin effect on adiposity and plasma insulin concentrations remained in food-restricted rats. CONCLUSION Chronic central administration of ghrelin reversed the effects of leptin, primarily by altering food intake, but ghrelin may have regulatory effects on adiposity and plasma insulin levels independent of feeding effect.
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Affiliation(s)
- M-S Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Ulsan College of Medicine, Seoul 138-736, Korea
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Chua SC, Liu SM, Li Q, Sun A, DeNino WF, Heymsfield SB, Guo XE. Transgenic complementation of leptin receptor deficiency. II. Increased leptin receptor transgene dose effects on obesity/diabetes and fertility/lactation in lepr-db/db mice. Am J Physiol Endocrinol Metab 2004; 286:E384-92. [PMID: 14600075 DOI: 10.1152/ajpendo.00349.2003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have generated mice that are homozygous for a leptin receptor transgene that is expressed exclusively in neurons (NSE-LEPR-B). We had previously shown that this transgene in the hemizygous state is effective in ameliorating almost all aspects of leptin receptor deficiency. Now, we show that the transgene, in the homozygous state, almost fully corrects the excess adiposity of LEPR-deficient (db/db) mice. Body composition analyses indicate that the transgene is able to restrain the massive increase in adiposity observed in LEPR-deficient mice. Examination of hypothalamic agouti gene-related peptide and proopiomelanocortin mRNA shows normalization of these leptin-regulated transcripts. Interestingly, despite normalization of circulating leptin concentrations by the transgene in the fed state, transgenic db3J/db mice did not show fasting-induced reductions of circulating leptin. Increased adiposity of the transgenic db/db mice at 4 wk of age, immediately postweaning, suggests that the transgene is less effective in correcting the preferential fat deposition caused by LEPR deficiency. We noted that the morphology of brown adipose tissue is nearly normal, concordant with the cold tolerance conferred by the transgene. Aspects of the diabetes phenotype are also corrected: glucose and insulin concentrations are nearly normal, and islet hyperplasia is greatly diminished. The transgene also corrects the infertility of db/db females and confers the ability to lactate sufficiently to nurse normal-sized litters. Finally, the slightly increased adiposity and mild insulin resistance of transgenic db/db dams were not a contributory factor to the increased fat content of transgenic db/db male progeny.
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Affiliation(s)
- Streamson C Chua
- Department of Pediatrics, Columbia University, New York, New York 10032, USA.
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Weide K, Christ N, Moar KM, Arens J, Hinney A, Mercer JG, Eiden S, Schmidt I. Hyperphagia, not hypometabolism, causes early onset obesity in melanocortin-4 receptor knockout mice. Physiol Genomics 2003; 13:47-56. [PMID: 12644632 DOI: 10.1152/physiolgenomics.00129.2002] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Previous studies on mice with melanocortin-4 receptor gene (MC4r) knockout have focused on obese adults. Because humans with functional MC4r mutations show early-onset obesity, we determined the onset of excessive fat deposition in 10- to 56-day-old mice, taking into account sex and litter influences. Total body fat content of MC4r-/- on day 35 and MC4r+/- on day 56 significantly exceeds that of MC4r+/+. Plasma leptin levels increase in proportion to fat mass. According to cumulative food intake and energy expenditure measurements from day 21 to 35, onset of excessive fat deposition in MC4r-/- is fueled by hyperphagia and counteracted partially by hypermetabolism. In 35- to 56-day-old mice, arcuate nucleus neuropeptide Y (NPY) mRNA decreases and pro-opiomelanocortin (POMC) mRNA increases with fat content and plasma leptin levels independently of genotype. Taking into account fat content by ANCOVA reveals, however, increases in both NPY mRNA and POMC mRNA due to melanocortin-4 receptor (MC4R) deficiency. We conclude that hyperphagia, not hypometabolism, is the primary disturbance initiating excessive fat deposition in MC4R-deficient mice at weaning and that the overall changes in NPY and POMC expression tend to antagonize the onset of excessive fat deposition.
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Affiliation(s)
- Karin Weide
- Max-Planck-Institut fuer physiologische und klinische Forschung, W. G. Kerckhoff-Institut, D-61231 Bad Nauheim, Germany
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Schmidt I. Metabolic Diseases: the Environment Determines the Odds, Even for Genes. Physiology (Bethesda) 2002. [DOI: 10.1152/physiologyonline.2002.17.3.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Ingrid Schmidt
- Max-Planck-Institut für physiologische und klinische Forschung, W. G. Kerckhoff-Institut, D-61231 Bad Nauheim, Germany
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Schmidt I. Metabolic diseases: the environment determines the odds, even for genes. Physiology (Bethesda) 2002; 17:115-21. [PMID: 12021382 DOI: 10.1152/nips.01380.2001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The odds for well-being or illness are determined by the interplay of genetic and environmental impacts. In this review, normal and disturbed body weight regulation are used to demonstrate the role of integrative bioresearch in bridging the gap between identified genotypes and an understanding of the functions of redundant and plastic control systems underlying phenotypes.
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Affiliation(s)
- Ingrid Schmidt
- Max-Planck-Institut für physiologische und klinische Forschung, W. G. Kerckhoff-Institut, D-61231 Bad Nauheim, Germany.
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Kellendonk C, Eiden S, Kretz O, Schütz G, Schmidt I, Tronche F, Simon E. Inactivation of the GR in the nervous system affects energy accumulation. Endocrinology 2002; 143:2333-40. [PMID: 12021198 DOI: 10.1210/endo.143.6.8853] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The homeostatic regulation of body weight protects the organism from the negative consequences of starvation and obesity. Glucocorticoids (GCs) modulate this regulation, although the underlying mechanisms remain unclear. To address the role of central GRs in the regulation of energy balance, we studied mice in which GRs have selectively been inactivated in the nervous system. Mutant mice display marked growth retardation. During suckling age this is associated with normal fat deposition causing a 60% temporary increase of percent body fat, compared with control littermates. After weaning, fat and protein depositions are reduced so that adults are both smaller and leaner than their controls. Decreased food intake and, after weaning, reduced metabolic efficiency account for these developmental disturbances. Plasma levels of leptin and insulin, two important energy balance regulators, are elevated in young mutants but normal in adults. Leptin/body fat ratio is higher at all ages, suggesting disturbed control of circulating leptin as a consequence of chronically elevated GC levels in mutant animals. Adult mutants display increased hypothalamic CRH and NPY levels, but peptide levels of melanin concentrating hormone and Orexin A and B are unchanged. The increased levels of plasma GCs and hypothalamic CRH may act as catabolic signals most likely leading to persistently reduced energy accumulation.
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Affiliation(s)
- Christoph Kellendonk
- German Cancer Research Center, Im Neuenheimer Feld 280, D-69121 Heidelberg, Germany
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Zhang Y, Guo KY, Diaz PA, Heo M, Leibel RL. Determinants of leptin gene expression in fat depots of lean mice. Am J Physiol Regul Integr Comp Physiol 2002; 282:R226-34. [PMID: 11742842 DOI: 10.1152/ajpregu.00392.2001] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The relationship of leptin gene expression to adipocyte volume was investigated in lean 10-wk-old male C57BL/6J mice. mRNA levels for leptin, insulin receptor, glucocorticoid receptor, and tumor necrosis factor (TNF)-alpha in inguinal, epididymal, and retroperitoneal adipose tissues were quantified and related to adipocyte volume. Leptin mRNA levels were highly correlated with adipocyte volume within each fat depot. Multiple regression analysis of pooled data from the three depots showed that leptin mRNA levels were strongly correlated with adipocyte volumes (beta = 0.84, P < 0.001) and, to a smaller degree, with glucocorticoid receptor mRNA levels (beta = 0.36, P < 0.001). Depot of origin had no effect (P > 0.9). Rates of leptin secretion in vitro were strongly correlated with leptin mRNA levels (r = 0.89, P < 0.001). mRNA levels for TNF-alpha, insulin receptor, and glucocorticoid receptor showed no significant correlation with adipocyte volume. These results demonstrate that depot-specific differences in leptin gene expression are mainly related to the volumes of the constituent adipocytes. The strong correlation between leptin gene expression and adipocyte volume supports leptin's physiological role as a humoral signal of fat mass.
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Affiliation(s)
- Yiying Zhang
- Division of Molecular Genetics, Department of Pediatrics, and the Naomi Berrie Diabetes Center, Columbia University College of Physicians and Surgeons, New York 10032, USA.
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Schmidt I, Fritz A, Schölch C, Schneider D, Simon E, Plagemann A. The effect of leptin treatment on the development of obesity in overfed suckling Wistar rats. Int J Obes (Lond) 2001; 25:1168-74. [PMID: 11477501 DOI: 10.1038/sj.ijo.0801669] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2000] [Revised: 12/21/2000] [Accepted: 02/12/2001] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To identify the role of hyperleptinaemia in mediating the effects of early postnatal overfeeding in a rat strain known to be prone to manipulations of the early environment which result in predispositions for obesity and associated metabolic and cardiovascular disturbance in later life. DESIGN Wistar rats were reared in normal litters (NL, 10--12 pups) or small litters (SL, four pups) from postnatal day 3 and killed for determination of body composition and plasma leptin and insulin concentrations on day 7 or day 21 after having been treated with recombinant leptin (2 x 50 (pmol/g)/day) or saline from day 1. RESULTS Rearing in SL doubled the body fat content and plasma leptin levels in comparison to NL pups by 21 days of age. Under leptin-treatment throughout suckling age, NL pups remained leptin responsive, ie the difference in body fat content was progressively reduced relative to the controls. Until 7 days of age, despite the body fat content of untreated SL pups being 2-fold higher and their plasma leptin level 7-fold higher than that of NL pups, leptin treatment caused the same percentage decreases in body fat in SL than in NL pups. But in contrast to NL pups, the SL pups became leptin resistant thereafter. Plasma insulin levels in 7-day-old leptin-treated SL pups were 3-fold higher than in untreated littermates and 5-fold higher than in the NL groups. CONCLUSION Prophylactic leptin treatment does not prevent hyperinsulinaemia and excessive fat deposition in SL pups. On the other hand, selective hyperleptinaemia during suckling age does not trigger leptin resistance and obesity in NL pups. Rather than hyperleptinaemia per se, other factors associated with early postnatal overnutrition, for example, the concurrent hyperinsulinaemia, seem to play a pivotal role for the development of leptin-resistance and life-long obesity risk in SL rats.
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Affiliation(s)
- I Schmidt
- Max-Planck-Institut für physiologische und klinische Forschung, W.G. Kerckhoff-Institut, Bad Nauheim, Germany.
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