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Sever S, White DL, Garcia JM. Is there an effect of ghrelin/ghrelin analogs on cancer? A systematic review. Endocr Relat Cancer 2016; 23:R393-409. [PMID: 27552970 PMCID: PMC5064755 DOI: 10.1530/erc-16-0130] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 07/14/2016] [Indexed: 12/14/2022]
Abstract
Ghrelin is a hormone with multiple physiologic functions, including promotion of growth hormone release, stimulation of appetite and regulation of energy homeostasis. Treatment with ghrelin/ghrelin-receptor agonists is a prospective therapy for disease-related cachexia and malnutrition. In vitro studies have shown high expression of ghrelin in cancer tissue, although its role including its impact in cancer risk and progression has not been established. We performed a systematic literature review to identify peer-reviewed human or animal in vivo original research studies of ghrelin, ghrelin-receptor agonists, or ghrelin genetic variants and the risk, presence, or growth of cancer using structured searches in PubMed database as well as secondary searches of article reference lists, additional reviews and meta-analyses. Overall, 45 (73.8%) of the 61 studies reviewed, including all 11 involving exogenous ghrelin/ghrelin-receptor agonist treatment, reported either a null (no statistically significant difference) or inverse association of ghrelin/ghrelin-receptor agonists or ghrelin genetic variants with cancer risk, presence or growth; 10 (16.7%) studies reported positive associations; and 6 (10.0%) reported both negative or null and positive associations. Differences in serum ghrelin levels in cancer cases vs controls (typically lower) were reported for some but not all cancers. The majority of in vivo studies showed a null or inverse association of ghrelin with risk and progression of most cancers, suggesting that ghrelin/ghrelin-receptor agonist treatment may have a favorable safety profile to use for cancer cachexia. Additional large-scale prospective clinical trials as well as basic bioscientific research are warranted to further evaluate the safety and benefits of ghrelin treatment in patients with cancer.
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Affiliation(s)
- Sakine Sever
- Division of EndocrinologyDiabetes, and Metabolism, Baylor College of Medicine, Alkek Building for Biomedical Research, Houston, Texas, USA
| | - Donna L White
- Section of Gastroenterology and HepatologyBaylor College of Medicine Medical Center, Houston, Texas, USA Clinical Epidemiology and Comparative Effectiveness ProgramSection of Health Services Research (IQuESt), Michael E. DeBakey Veterans Affairs Medical Center, HSR&D Center of Innovation (152), Houston, Texas, USA Texas Medical Center Digestive Disease CenterBaylor College of Medicine, Houston, Texas, USA Dan L. Duncan Comprehensive Cancer CenterBaylor College of Medicine, Houston, Texas, USA Center for Translational Research on Inflammatory Diseases (CTRID)Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA
| | - José M Garcia
- Division of EndocrinologyDiabetes, and Metabolism, Baylor College of Medicine, Alkek Building for Biomedical Research, Houston, Texas, USA Center for Translational Research on Inflammatory Diseases (CTRID)Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA Department of Molecular and Cellular BiologyBaylor College of Medicine, Houston, Texas, USA Huffington Center on AgingBaylor College of Medicine, Houston, Texas, USA Geriatrics Research Education and Clinical CenterVeterans Affairs Puget Sound Health Care System and University of Washington, Seattle, Washington, USA
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2
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Oya M, Kitaguchi T, Harada K, Numano R, Sato T, Kojima M, Tsuboi T. Low glucose-induced ghrelin secretion is mediated by an ATP-sensitive potassium channel. J Endocrinol 2015; 226:25-34. [PMID: 26099355 DOI: 10.1530/joe-15-0090] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Ghrelin is synthesized in X/A-like cells of the gastric mucosa, which plays an important role in the regulation of energy homeostasis. Although ghrelin secretion is known to be induced by neurotransmitters or hormones or by nutrient sensing in the ghrelin-secreting cells themselves, the mechanism of ghrelin secretion is not clearly understood. In the present study, we found that changing the extracellular glucose concentration from elevated (25 mM) to optimal (10 mM) caused an increase in the intracellular Ca2+ concentration ([Ca2+]i) in ghrelin-secreting mouse ghrelinoma 3-1 (MGN3-1) cells (n=32, P<0.01), whereas changing the glucose concentration from elevated to lowered (5 or 1 mM) had little effect on [Ca2+]i increase. Overexpression of a closed form of an ATP-sensitive K+ (KATP) channel mutant suppressed the 10 mM glucose-induced [Ca2+]i increase (n=8, P<0.01) and exocytotic events (n=6, P<0.01). We also found that a low concentration of a KATP channel opener, diazoxide, with 25 mM glucose induced [Ca2+]i increase (n=23, P<0.01) and ghrelin secretion (n≥3, P<0.05). In contrast, the application of a low concentration of a KATP channel blocker, tolbutamide, significantly induced [Ca2+]i increase (n=15, P<0.01) and ghrelin secretion (n≥3, P<0.05) under 5 mM glucose. Furthermore, the application of voltage-dependent Ca2+ channel inhibitors suppressed the 10 mM glucose-induced [Ca2+]i increase (n≥26, P<0.01) and ghrelin secretion (n≥5, P<0.05). These findings suggest that KATP and voltage-dependent Ca2+ channels are involved in glucose-dependent ghrelin secretion in MGN3-1 cells.
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Affiliation(s)
- Manami Oya
- Department of Life SciencesGraduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, JapanCell Signaling GroupWASEDA Bioscience Research Institute in Singapore (WABIOS), 11 Biopolis Way, #05-02 Helios, Singapore 138667, SingaporeOrganization for University Research InitiativesWaseda University, #304, Block 120-4, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, JapanDepartment of Environmental and Life SciencesElectronics-Inspired Interdisciplinary Research Institute (EIIRIS), Toyohashi University of Technology, 1-1 Hibarigaoka, Tennpaku-cho, Toyohashi, Aichi 441-8580, JapanMolecular GeneticsInstitute of Life Sciences, Kurume University, 1-1 Hyakunen Kohen, Kurume, Fukuoka 839-0864, Japan
| | - Tetsuya Kitaguchi
- Department of Life SciencesGraduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, JapanCell Signaling GroupWASEDA Bioscience Research Institute in Singapore (WABIOS), 11 Biopolis Way, #05-02 Helios, Singapore 138667, SingaporeOrganization for University Research InitiativesWaseda University, #304, Block 120-4, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, JapanDepartment of Environmental and Life SciencesElectronics-Inspired Interdisciplinary Research Institute (EIIRIS), Toyohashi University of Technology, 1-1 Hibarigaoka, Tennpaku-cho, Toyohashi, Aichi 441-8580, JapanMolecular GeneticsInstitute of Life Sciences, Kurume University, 1-1 Hyakunen Kohen, Kurume, Fukuoka 839-0864, Japan Department of Life SciencesGraduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, JapanCell Signaling GroupWASEDA Bioscience Research Institute in Singapore (WABIOS), 11 Biopolis Way, #05-02 Helios, Singapore 138667, SingaporeOrganization for University Research InitiativesWaseda University, #304, Block 120-4, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, JapanDepartment of Environmental and Life SciencesElectronics-Inspired Interdisciplinary Research Institute (EIIRIS), Toyohashi University of Technology, 1-1 Hibarigaoka, Tennpaku-cho, Toyohashi, Aichi 441-8580, JapanMolecular GeneticsInstitute of Life Sciences, Kurume University, 1-1 Hyakunen Kohen, Kurume, Fukuoka 839-0864, Japan
| | - Kazuki Harada
- Department of Life SciencesGraduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, JapanCell Signaling GroupWASEDA Bioscience Research Institute in Singapore (WABIOS), 11 Biopolis Way, #05-02 Helios, Singapore 138667, SingaporeOrganization for University Research InitiativesWaseda University, #304, Block 120-4, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, JapanDepartment of Environmental and Life SciencesElectronics-Inspired Interdisciplinary Research Institute (EIIRIS), Toyohashi University of Technology, 1-1 Hibarigaoka, Tennpaku-cho, Toyohashi, Aichi 441-8580, JapanMolecular GeneticsInstitute of Life Sciences, Kurume University, 1-1 Hyakunen Kohen, Kurume, Fukuoka 839-0864, Japan
| | - Rika Numano
- Department of Life SciencesGraduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, JapanCell Signaling GroupWASEDA Bioscience Research Institute in Singapore (WABIOS), 11 Biopolis Way, #05-02 Helios, Singapore 138667, SingaporeOrganization for University Research InitiativesWaseda University, #304, Block 120-4, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, JapanDepartment of Environmental and Life SciencesElectronics-Inspired Interdisciplinary Research Institute (EIIRIS), Toyohashi University of Technology, 1-1 Hibarigaoka, Tennpaku-cho, Toyohashi, Aichi 441-8580, JapanMolecular GeneticsInstitute of Life Sciences, Kurume University, 1-1 Hyakunen Kohen, Kurume, Fukuoka 839-0864, Japan
| | - Takahiro Sato
- Department of Life SciencesGraduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, JapanCell Signaling GroupWASEDA Bioscience Research Institute in Singapore (WABIOS), 11 Biopolis Way, #05-02 Helios, Singapore 138667, SingaporeOrganization for University Research InitiativesWaseda University, #304, Block 120-4, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, JapanDepartment of Environmental and Life SciencesElectronics-Inspired Interdisciplinary Research Institute (EIIRIS), Toyohashi University of Technology, 1-1 Hibarigaoka, Tennpaku-cho, Toyohashi, Aichi 441-8580, JapanMolecular GeneticsInstitute of Life Sciences, Kurume University, 1-1 Hyakunen Kohen, Kurume, Fukuoka 839-0864, Japan
| | - Masayasu Kojima
- Department of Life SciencesGraduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, JapanCell Signaling GroupWASEDA Bioscience Research Institute in Singapore (WABIOS), 11 Biopolis Way, #05-02 Helios, Singapore 138667, SingaporeOrganization for University Research InitiativesWaseda University, #304, Block 120-4, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, JapanDepartment of Environmental and Life SciencesElectronics-Inspired Interdisciplinary Research Institute (EIIRIS), Toyohashi University of Technology, 1-1 Hibarigaoka, Tennpaku-cho, Toyohashi, Aichi 441-8580, JapanMolecular GeneticsInstitute of Life Sciences, Kurume University, 1-1 Hyakunen Kohen, Kurume, Fukuoka 839-0864, Japan
| | - Takashi Tsuboi
- Department of Life SciencesGraduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, JapanCell Signaling GroupWASEDA Bioscience Research Institute in Singapore (WABIOS), 11 Biopolis Way, #05-02 Helios, Singapore 138667, SingaporeOrganization for University Research InitiativesWaseda University, #304, Block 120-4, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, JapanDepartment of Environmental and Life SciencesElectronics-Inspired Interdisciplinary Research Institute (EIIRIS), Toyohashi University of Technology, 1-1 Hibarigaoka, Tennpaku-cho, Toyohashi, Aichi 441-8580, JapanMolecular GeneticsInstitute of Life Sciences, Kurume University, 1-1 Hyakunen Kohen, Kurume, Fukuoka 839-0864, Japan
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Lauritzen ES, Voss T, Kampmann U, Mengel A, Vendelbo MH, Jørgensen JOL, Møller N, Vestergaard ET. Circulating acylghrelin levels are suppressed by insulin and increase in response to hypoglycemia in healthy adult volunteers. Eur J Endocrinol 2015; 172:357-62. [PMID: 25599708 DOI: 10.1530/eje-14-0880] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Ghrelin has glucoregulatory and orexigenic actions, but its role in acute hypoglycemia remains uncertain. We aimed to investigate circulating levels of acylghrelin (AG) and unacylated ghrelin (UAG) in response to hyperinsulinemia and to hypoglycemia. DESIGN A randomized, single-blind, placebo-controlled crossover study including 3 study days was performed at a university hospital clinical research center. METHODS Nine healthy men completed 3 study days: i) saline control (CTR), ii) hyperinsulinemic euglycemia (HE) (bolus insulin 0.1 IE/kg i.v. and glucose 20% i.v. for 105 min, plasma glucose ≈5 mmol/l), and iii) hyperinsulinemic hypoglycemia (HH) (bolus insulin 0.1 IE/kg i.v.). RESULTS HH and HE suppressed AG concentrations at t=45-60 min as compared with CTR (P<0.05). At t=90 min, a rebound increase in AG was observed in response to HH as compared with both HE and CTR (P<0.05). UAG also decreased during HH and HE at t=45 min (P<0.05), whereas the AG-to-UAG ratio remained unaffected. CONCLUSIONS This study demonstrates that AG and UAG are directly suppressed by hyperinsulinemia and that AG concentrations increase after a latency of ≈1 h in response to hypoglycemia, suggesting a potential counterregulatory role of AG.
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Affiliation(s)
- Esben S Lauritzen
- Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark
| | - Thomas Voss
- Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark
| | - Ulla Kampmann
- Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark
| | - Annette Mengel
- Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark
| | - Mikkel H Vendelbo
- Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark
| | - Jens O L Jørgensen
- Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark
| | - Niels Møller
- Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark
| | - Esben T Vestergaard
- Medical Research LaboratoryAarhus University, Nørrebrogade 44, Building 3B, 8000 Aarhus C, DenmarkDepartment of Endocrinology and Internal MedicineAarhus University Hospital, Nørrebrogade 44, Building 2A, 8000 Aarhus C, Denmark
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4
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Shiimura Y, Ohgusu H, Sato T, Kojima M. Regulation of the Human Ghrelin Promoter Activity by Transcription Factors, NF-κB and Nkx2.2. Int J Endocrinol 2015; 2015:580908. [PMID: 25699080 PMCID: PMC4324914 DOI: 10.1155/2015/580908] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 12/24/2014] [Indexed: 11/24/2022] Open
Abstract
To examine the gene expression of ghrelin, a growth hormone releasing and appetite stimulating hormone from stomach, we constructed human ghrelin promoter-reporter vectors and analyzed the promoter activity. The ghrelin promoter activity was high when cultured cells that express ghrelin mRNA endogenously like TT or ECC10 cells were used, indicating that these cells contain factors necessary for full expression of the human ghrelin gene. The human ghrelin promoter contains both positive and negative regulatory regions. A transient decrease of the promoter activity was found when the reporter vector with the -1600 fragment of the human ghrelin promoter was transfected into cultured cells. We then examined the effect of several transcription factors on the ghrelin promoter activity and found that NF-κB suppressed and that Nkx2.2, a homeodomain-containing transcription factor that is important for ghrelin cell development in pancreas, activates the promoter activity. These transcription factors may be possible targets for the control of ghrelin gene expression.
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Affiliation(s)
- Yuki Shiimura
- Molecular Genetics, Institute of Life Science, Kurume University, Kurume, Fukuoka 839-0864, Japan
| | - Hideko Ohgusu
- Molecular Genetics, Institute of Life Science, Kurume University, Kurume, Fukuoka 839-0864, Japan
| | - Takahiro Sato
- Molecular Genetics, Institute of Life Science, Kurume University, Kurume, Fukuoka 839-0864, Japan
| | - Masayasu Kojima
- Molecular Genetics, Institute of Life Science, Kurume University, Kurume, Fukuoka 839-0864, Japan
- *Masayasu Kojima:
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5
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Abstract
Although the stomach is often perceived as a crude, food-grinding, muscular bag, scientific breakthroughs have shown us that in the case of the stomach there is more than meets the eye. The endocrine function of the stomach is mainly exerted through the actions of ghrelin, an acylated peptide hormone that is the first known and so far most extensively studied endogenous orexigenic substance. The satiety-hunger balance is kept in check by many anorexigenic gut hormones among which is the deacylated form of ghrelin--desacyl ghrelin. The interplay of gut hormones affects the brain directly, as most gut hormones cross the blood-brain barrier and bind to their respective receptors in the central nervous system. Other hormones like obestatin and nesfatin are secreted from the stomach along with ghrelin, yet their physiological function is to be elucidated. The importance of the satiety-hunger balance can be seen in its most typical derangement--obesity. Some studies imply that ghrelin, along with other gut hormones, plays an important part in the pathophysiology of obesity. More importantly, it seems that the mechanisms by which bariatric surgery procedures induce weight loss are primarily based on changing the gut hormone levels, including ghrelin. If proven, ghrelin antagonists could be the renaissance of pharmacological obesity treatment.
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Affiliation(s)
- Davor Štimac
- Department of Gastroenterology, Clinical Hospital Centre Rijeka, School of Medicine, University of Rijeka, Rijeka, Croatia
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6
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Gahete MD, Rincón-Fernández D, Villa-Osaba A, Hormaechea-Agulla D, Ibáñez-Costa A, Martínez-Fuentes AJ, Gracia-Navarro F, Castaño JP, Luque RM. Ghrelin gene products, receptors, and GOAT enzyme: biological and pathophysiological insight. J Endocrinol 2014; 220:R1-24. [PMID: 24194510 DOI: 10.1530/joe-13-0391] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Ghrelin is a 28-amino acid acylated hormone, highly expressed in the stomach, which binds to its cognate receptor (GHSR1a) to regulate a plethora of relevant biological processes, including food intake, energy balance, hormonal secretions, learning, inflammation, etc. However, ghrelin is, in fact, the most notorious component of a complex, intricate regulatory system comprised of a growing number of alternative peptides (e.g. obestatin, unacylated ghrelin, and In1-ghrelin, etc.), known (GHSRs) and, necessarily unknown receptors, as well as modifying enzymes (e.g. ghrelin-O-acyl-transferase), which interact among them as well as with other regulatory systems in order to tightly modulate key (patho)-physiological processes. This multiplicity of functions and versatility of the ghrelin system arise from a dual, genetic and functional, complexity. Importantly, a growing body of evidence suggests that dysregulation in some of the components of the ghrelin system can lead to or influence the development and/or progression of highly concerning pathologies such as endocrine-related tumors, inflammatory/cardiovascular diseases, and neurodegeneration, wherein these altered components could be used as diagnostic, prognostic, or therapeutic targets. In this context, the aim of this review is to integrate and comprehensively analyze the multiple components and functions of the ghrelin system described to date in order to define and understand its biological and (patho)-physiological significance.
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Affiliation(s)
- Manuel D Gahete
- Department of Cell Biology, Physiology and Immunology, Campus Universitario de Rabanales, Edificio Severo Ochoa (C6), Planta 3, University of Córdoba, 14014-Córdoba; Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), University of Córdoba; Reina Sofia University Hospital, Córdoba; and CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Córdoba, Spain
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7
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Delporte C. Structure and physiological actions of ghrelin. SCIENTIFICA 2013; 2013:518909. [PMID: 24381790 PMCID: PMC3863518 DOI: 10.1155/2013/518909] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 11/10/2013] [Indexed: 05/30/2023]
Abstract
Ghrelin is a gastric peptide hormone, discovered as being the endogenous ligand of growth hormone secretagogue receptor. Ghrelin is a 28 amino acid peptide presenting a unique n-octanoylation modification on its serine in position 3, catalyzed by ghrelin O-acyl transferase. Ghrelin is mainly produced by a subset of stomach cells and also by the hypothalamus, the pituitary, and other tissues. Transcriptional, translational, and posttranslational processes generate ghrelin and ghrelin-related peptides. Homo- and heterodimers of growth hormone secretagogue receptor, and as yet unidentified receptors, are assumed to mediate the biological effects of acyl ghrelin and desacyl ghrelin, respectively. Ghrelin exerts wide physiological actions throughout the body, including growth hormone secretion, appetite and food intake, gastric secretion and gastrointestinal motility, glucose homeostasis, cardiovascular functions, anti-inflammatory functions, reproductive functions, and bone formation. This review focuses on presenting the current understanding of ghrelin and growth hormone secretagogue receptor biology, as well as the main physiological effects of ghrelin.
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Affiliation(s)
- Christine Delporte
- Laboratory of Pathophysiological and Nutritional Biochemistry, Université Libre de Bruxelles, 808 Route de Lennik, Bat G/E-CP611, 1070 Brussels, Belgium
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8
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Fukumori R, Sugino T, Shingu H, Moriya N, Kobayashi H, Hasegawa Y, Kojima M, Kangawa K, Obitsu T, Kushibiki S, Taniguchi K. Ingestion of medium chain fatty acids by lactating dairy cows increases concentrations of plasma ghrelin. Domest Anim Endocrinol 2013; 45:216-23. [PMID: 24209506 DOI: 10.1016/j.domaniend.2013.09.005] [Citation(s) in RCA: 16] [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] [Received: 08/06/2013] [Revised: 09/12/2013] [Accepted: 09/12/2013] [Indexed: 10/26/2022]
Abstract
The purpose of this study was to elucidate the effects of medium-chain fatty acids (MCFAs) on plasma ghrelin concentration in lactating dairy cows. Five early-lactating Holstein cows were randomly assigned to 2 dietary treatments in a crossover design with 2-wk periods. Treatments consisted of diets supplemented or not (control) with calcium salts of MCFAs (MCFA-Ca; 1.5% dry matter). Plasma hormone and metabolite concentrations in blood samples taken from the jugular vein were measured on the morning of feeding on day 14 of each period. Dry matter intake, milk protein, and lactose content of cows fed the MCFA-Ca diet were decreased compared with controls, but with no change in milk yield. Plasma ghrelin concentrations were higher in cows fed the MCFA-Ca diet; however, no significant effect was found on glucagon-like peptide-1 concentrations in plasma. Plasma insulin concentrations decreased, but plasma glucagon concentrations remained unchanged in cows fed the MCFA-Ca diet. The concentrations of nonesterified FAs, total cholesterol, and β-hydroxybutyrate in plasma increased in these cows. In conclusion, dietary MCFAs increase the plasma ghrelin concentrations in lactating dairy cows.
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Affiliation(s)
- R Fukumori
- Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8528, Japan; National Institute of Livestock and Grassland Science, Tsukuba 305-0901, Japan
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9
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Chaves VE, Júnior FM, Bertolini GL. The metabolic effects of growth hormone in adipose tissue. Endocrine 2013; 44:293-302. [PMID: 23430368 DOI: 10.1007/s12020-013-9904-3] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Accepted: 02/09/2013] [Indexed: 11/27/2022]
Abstract
There is a general consensus that a reduction in growth hormone (GH) secretion results in obesity. However, the pathophysiologic role of GH in the metabolism of lipids is yet to be fully understood. The major somatic targets of GH are bones and muscles, but GH stimulates lipolysis and seems to regulate lipid deposition in adipose tissue. Patients with isolated GH deficiency (GHD) have enlarged fat depots due to higher fat cell volume, but their fat cell numbers are lower than those of matched controls. The treatment of patients with GH results in a relative loss of body fat and shifts both fat cell number and fat cell volume toward normal, indicating an adipogenic effect of GH. Adults with GHD are characterized by perturbations in body composition, lipid metabolism, cardiovascular risk profile, and bone mineral density. It is well established that GHD is usually accompanied by an increase in fat accumulation; GH replacement in GHD results in the reduction of fat mass, particularly abdominal fat mass. In addition, abdominal obesity results in a secondary reduction in GH secretion that is reversible with weight loss. However, whereas GH replacement in patients with GHD leads to specific depletion of intra-abdominal fat, administering GH to obese individuals does not seem to result in a consistent reduction or redistribution of body fat. Although administering GH to obese non-GHD subjects has only led to equivocal results, more recent studies indicate that GH still remains a plausible metabolic candidate.
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Affiliation(s)
- Valéria Ernestânia Chaves
- Laboratory of Physiology and Pharmacology, Federal University of São João del-Rei, Divinópolis, Minas Gerais, Brazil
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Massanet P, Richard C, Jonquet O, Corne P. La reprise de la nutrition orale en réanimation. MEDECINE INTENSIVE REANIMATION 2013. [DOI: 10.1007/s13546-013-0708-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Suzuki H, Asakawa A, Amitani H, Fujitsuka N, Nakamura N, Inui A. Cancer cachexia pathophysiology and translational aspect of herbal medicine. Jpn J Clin Oncol 2013; 43:695-705. [PMID: 23737606 DOI: 10.1093/jjco/hyt075] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
About half of all cancer patients show a syndrome of cachexia, characterized by anorexia and loss of adipose tissue and skeletal muscle mass. Numerous cytokines have been postulated to play a role in the etiology of cancer cachexia. Cytokines can elicit effects that mimic leptin signaling and suppress orexigenic ghrelin and neuropeptide Y signaling, inducing sustained anorexia and cachexia not accompanied by the usual compensatory response. Furthermore, cytokines have been implicated in the induction of cancer-related muscle wasting. In particular, tumor necrosis factor-alpha, interleukin-1, interleukin-6 and interferon-gamma have been implicated in the induction of cancer-related muscle wasting. Cytokine-induced skeletal muscle wasting is probably a multifactorial process, which involves a depression in protein synthesis, an increase in protein degradation or a combination of both. Cancer patients suffer from the reduction in physical function, tolerance to anti-cancer therapy and survival, while many effective chemotherapeutic agents for cancer are burdened by toxicities that can reduce patient's quality of life or hinder their effective use. Herbal medicines have been widely used to help improve such conditions. Recent studies have shown that herbal medicines such as rikkunshito enhance ghrelin signaling and consequently improve nausea, appetite loss and cachexia associated with cancer or cancer chemotherapy, which worsens the quality of life and life expectancy of the patients. The multicomponent herbal medicines capable of targeting multiple sites could be useful for future drug discovery. Mechanistic studies and identification of active compounds could lead to new discoveries in biological and biomedical sciences.
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Affiliation(s)
- Hajime Suzuki
- Department of Psychosomatic Internal Medicine, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima, 890-8520, Japan
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12
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Suzuki H, Asakawa A, Amitani H, Nakamura N, Inui A. Cancer cachexia--pathophysiology and management. J Gastroenterol 2013; 48:574-94. [PMID: 23512346 PMCID: PMC3698426 DOI: 10.1007/s00535-013-0787-0] [Citation(s) in RCA: 162] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Accepted: 02/20/2013] [Indexed: 02/04/2023]
Abstract
About half of all cancer patients show a syndrome of cachexia, characterized by anorexia and loss of adipose tissue and skeletal muscle mass. Cachexia can have a profound impact on quality of life, symptom burden, and a patient's sense of dignity. It is a very serious complication, as weight loss during cancer treatment is associated with more chemotherapy-related side effects, fewer completed cycles of chemotherapy, and decreased survival rates. Numerous cytokines have been postulated to play a role in the etiology of cancer cachexia. Cytokines can elicit effects that mimic leptin signaling and suppress orexigenic ghrelin and neuropeptide Y (NPY) signaling, inducing sustained anorexia and cachexia not accompanied by the usual compensatory response. Furthermore, cytokines have been implicated in the induction of cancer-related muscle wasting. Cytokine-induced skeletal muscle wasting is probably a multifactorial process, which involves a protein synthesis inhibition, an increase in protein degradation, or a combination of both. The best treatment of the cachectic syndrome is a multifactorial approach. Many drugs including appetite stimulants, thalidomide, cytokine inhibitors, steroids, nonsteroidal anti-inflammatory drugs, branched-chain amino acids, eicosapentaenoic acid, and antiserotoninergic drugs have been proposed and used in clinical trials, while others are still under investigation using experimental animals. There is a growing awareness of the positive impact of supportive care measures and development of promising novel pharmaceutical agents for cachexia. While there has been great progress in understanding the underlying biological mechanisms of cachexia, health care providers must also recognize the psychosocial and biomedical impact cachexia can have.
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Affiliation(s)
- Hajime Suzuki
- />Department of Psychosomatic Internal Medicine, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima, 890-8520 Japan
- />Department of Oral and Maxillofacial Surgery, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, 890-8520 Japan
| | - Akihiro Asakawa
- />Department of Psychosomatic Internal Medicine, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima, 890-8520 Japan
| | - Haruka Amitani
- />Department of Psychosomatic Internal Medicine, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima, 890-8520 Japan
| | - Norifumi Nakamura
- />Department of Oral and Maxillofacial Surgery, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, 890-8520 Japan
| | - Akio Inui
- />Department of Psychosomatic Internal Medicine, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima, 890-8520 Japan
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Laparoscopic Adjustable Gastric Banded Plication: a Case-Matched Comparative Study with Laparoscopic Sleeve Gastrectomy. Obes Surg 2013; 23:1319-23. [DOI: 10.1007/s11695-013-0951-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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14
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Li B, Zhou X, Wu J, Zhou H. From gut changes to type 2 diabetes remission after gastric bypass surgeries. Front Med 2013; 7:191-200. [PMID: 23553469 DOI: 10.1007/s11684-013-0258-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 01/14/2013] [Indexed: 12/18/2022]
Abstract
Increasing evidence suggests that the gut may influence the host's metabolism and ultimately change the outcomes of type 2 diabetes mellitus (T2DM). We review the evidence on the relationship between the gut and T2DM remission after gastric bypass surgery, and discuss the potential mechanisms underlying the above relationship: gut anatomical rearrangement, microbial composition changes, altered gut cells, and gut hormone modulation. However, the exact changes and their relative importance in the metabolic improvements after gastric bypass surgery remain to be further clarified. Elucidating the precise metabolic mechanisms of T2DM resolution after bypass surgery will help to reveal the molecular mechanisms of pathogenesis, and facilitate the development of novel diagnoses and preventative interventions for this common disease.
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Affiliation(s)
- Bing Li
- Key Laboratory of Systems Biology, SIBS-Novo Nordisk Translational Research Centre for PreDiabetes, Shanghai Institutes for Biological Sciences, CAS, Shanghai, China
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15
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Mangner N, Matsuo Y, Schuler G, Adams V. Cachexia in chronic heart failure: endocrine determinants and treatment perspectives. Endocrine 2013; 43:253-65. [PMID: 22903414 DOI: 10.1007/s12020-012-9767-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 07/24/2012] [Indexed: 12/11/2022]
Abstract
It is well documented in the current literature that chronic heart failure is often associated with cachexia, defined as involuntary weight loss of 5 % in 12 month or less. Clinical studies unraveled that the presence of cachexia decreases significantly mean survival of the patient. At the molecular level mainly myofibrillar proteins are degraded, although a reduced protein synthesis may also contribute to the loss of muscle mass. Endocrine factors clearly regulate muscle mass and function by influencing the normally precisely controlled balance between protein breakdown and protein synthesis The aim of the present article is to review the knowledge in the field with respect to the role of endocrine factors for the regulation of cachexia in patients with CHF and deduce treatment perspectives.
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Affiliation(s)
- Norman Mangner
- Heart Center Leipzig, University Leipzig, Strümpellstrasse 39, 04289, Leipzig, Germany
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16
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Ishitobi Y, Kohno K, Kanehisa M, Inoue A, Imanaga J, Maruyama Y, Ninomiya T, Higuma H, Okamoto S, Tanaka Y, Tsuru J, Hanada H, Isogawa K, Akiyoshi J. Serum ghrelin levels and the effects of antidepressants in major depressive disorder and panic disorder. Neuropsychobiology 2013; 66:185-92. [PMID: 22948519 DOI: 10.1159/000339948] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2012] [Accepted: 06/08/2012] [Indexed: 11/19/2022]
Abstract
BACKGROUND Two opposing models for the action of ghrelin in the behavioral responses to stress were recently proposed. Some studies suggest that an increase in ghrelin contributes to the mechanisms responsible for the development of stress-induced depression and anxiety, while others suggest that it helps minimize what otherwise would be more severe manifestations of depression and anxiety following stress. METHODS We measured serum ghrelin levels, Profile of Mood States (POMS) scores and State-Trait Anxiety Inventory scores in nonresponders (treatment-resistant patients; 30) and responders (38) with major depressive disorder (MDD), nonresponders (29) and responders (51) with panic disorder and 97 healthy controls. RESULTS The ghrelin concentration in nonresponders with MDD was higher than that of responders with MDD and normal controls. The ghrelin concentration in nonresponders with panic disorder was higher than that of normal controls. POMS vigor scores in patients with MDD and panic disorder were significantly decreased compared with those in healthy controls. Other POMS scores in patients with MDD and panic disorder were significantly increased compared with those of healthy controls. Trait and state anxiety of the State-Trait Anxiety Inventory in MDD and panic disorder patients were higher than those in healthy controls. CONCLUSIONS These results indicate that decreased serum ghrelin levels might be associated with antidepressant treatment to confer the maximum therapeutic effect in patients with MDD and panic disorder.
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Affiliation(s)
- Yoshinobu Ishitobi
- Department of Neuropsychiatry, Oita University Faculty of Medicine, Oita, Japan
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Kaiya H, Kangawa K, Miyazato M. What is the general action of ghrelin for vertebrates? - comparisons of ghrelin's effects across vertebrates. Gen Comp Endocrinol 2013. [PMID: 23178701 DOI: 10.1016/j.ygcen.2012.10.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Ten years and more passed since ghrelin was discovered. Various physiological actions of ghrelin have been documented in both mammalian and nonmammalian vertebrates. Do these actions have any commonality? In this review, we focused on several effects of ghrelin, and compared the effect across vertebrates. We would like to discuss possible general function of ghrelin in vertebrates.
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Affiliation(s)
- Hiroyuki Kaiya
- Department of Biochemistry, National Cerebral and Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan.
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Smitka K, Papezova H, Vondra K, Hill M, Hainer V, Nedvidkova J. The role of "mixed" orexigenic and anorexigenic signals and autoantibodies reacting with appetite-regulating neuropeptides and peptides of the adipose tissue-gut-brain axis: relevance to food intake and nutritional status in patients with anorexia nervosa and bulimia nervosa. Int J Endocrinol 2013; 2013:483145. [PMID: 24106499 PMCID: PMC3782835 DOI: 10.1155/2013/483145] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 07/11/2013] [Indexed: 12/13/2022] Open
Abstract
Eating disorders such as anorexia (AN) and bulimia nervosa (BN) are characterized by abnormal eating behavior. The essential aspect of AN is that the individual refuses to maintain a minimal normal body weight. The main features of BN are binge eating and inappropriate compensatory methods to prevent weight gain. The gut-brain-adipose tissue (AT) peptides and neutralizing autoantibodies play an important role in the regulation of eating behavior and growth hormone release. The mechanisms for controlling food intake involve an interplay between gut, brain, and AT. Parasympathetic, sympathetic, and serotoninergic systems are required for communication between brain satiety centre, gut, and AT. These neuronal circuits include neuropeptides ghrelin, neuropeptide Y (NPY), peptide YY (PYY), cholecystokinin (CCK), leptin, putative anorexigen obestatin, monoamines dopamine, norepinephrine (NE), serotonin, and neutralizing autoantibodies. This extensive and detailed report reviews data that demonstrate that hunger-satiety signals play an important role in the pathogenesis of eating disorders. Neuroendocrine dysregulations of the AT-gut-brain axis peptides and neutralizing autoantibodies may result in AN and BN. The circulating autoantibodies can be purified and used as pharmacological tools in AN and BN. Further research is required to investigate the orexigenic/anorexigenic synthetic analogs and monoclonal antibodies for potential treatment of eating disorders in clinical practice.
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Affiliation(s)
- Kvido Smitka
- Institute of Endocrinology, Laboratory of Clinical and Experimental Neuroendocrinology, Narodni 8, 116 94 Prague 1, Czech Republic
| | - Hana Papezova
- Psychiatric Clinic, First Faculty of Medicine, Charles University, Ke Karlovu 11, 121 08 Prague 2, Czech Republic
| | - Karel Vondra
- Institute of Endocrinology, Laboratory of Clinical and Experimental Neuroendocrinology, Narodni 8, 116 94 Prague 1, Czech Republic
| | - Martin Hill
- Institute of Endocrinology, Laboratory of Clinical and Experimental Neuroendocrinology, Narodni 8, 116 94 Prague 1, Czech Republic
| | - Vojtech Hainer
- Institute of Endocrinology, Laboratory of Clinical and Experimental Neuroendocrinology, Narodni 8, 116 94 Prague 1, Czech Republic
| | - Jara Nedvidkova
- Institute of Endocrinology, Laboratory of Clinical and Experimental Neuroendocrinology, Narodni 8, 116 94 Prague 1, Czech Republic
- *Jara Nedvidkova:
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Ackerman KE, Patel KT, Guereca G, Pierce L, Herzog DB, Misra M. Cortisol secretory parameters in young exercisers in relation to LH secretion and bone parameters. Clin Endocrinol (Oxf) 2013; 78:114-9. [PMID: 22671919 PMCID: PMC3443505 DOI: 10.1111/j.1365-2265.2012.04458.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Revised: 05/21/2012] [Accepted: 05/30/2012] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Amenorrhoea and low bone density are common in excessive exercisers, yet endocrine factors that differentiate adolescent amenorrhoeic exercisers (AE) from eumenorrhoeic exercisers (EE) are unclear. We have previously reported that high ghrelin and low leptin predict lower LH secretion in AE. Leptin and ghrelin impact cortisol secretion, and hypercortisolaemia can inhibit LH pulsatility. We hypothesized that higher cortisol secretion in young endurance weight-bearing AE compared with EE and nonexercisers predicts lower LH secretion, lower levels of a bone formation marker and higher levels of a bone resorption marker. DESIGN Cross-sectional. SUBJECTS We studied 21 AE, 18 EE and 20 nonexercisers aged 14-21 years (BMI 10th-90th%iles). MEASUREMENTS Subjects underwent frequent sampling (11 p.m. to 7 a.m.) to assess cortisol, ghrelin, leptin and LH secretory dynamics. Fasting levels of a bone formation (P1NP) and bone resorption (CTX) marker were measured. RESULTS BMI did not differ among groups. Cortisol pulse amplitude, mass, half-life and area under the curve (AUC) were highest in AE (P = 0.04, 0.007, 0.04 and 0.003) and were associated inversely with fat mass (r = -0.29, -0.28 and -0.35, P = 0.03, 0.04 and 0.007). We observed inverse associations between cortisol and LH AUC (r = -0.36, P = 0.008), which persisted after controlling for fat mass, leptin and ghrelin AUC. Cortisol correlated positively with CTX in EE and inversely with P1NP in nonexercisers. CONCLUSIONS Higher cortisol secretion in AE compared with EE and nonexercisers is associated with lower LH secretion. Effects of leptin and ghrelin on LH secretion may be mediated by increased cortisol.
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Affiliation(s)
- Kathryn E. Ackerman
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Division of Sports Medicine, Children’s Hospital, Boston, MA
| | - Kamal T. Patel
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Gabriela Guereca
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Lisa Pierce
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | | | - Madhusmita Misra
- Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Pediatric Endocrine Unit, Mass General Hospital for Children, Boston, MA, United States
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Guillory B, Splenser A, Garcia J. The Role of Ghrelin in Anorexia–Cachexia Syndromes. ANOREXIA 2013; 92:61-106. [DOI: 10.1016/b978-0-12-410473-0.00003-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Abstract
Ghrelin, an orexigenic hormone, is known to occur in the normal anterior pituitary where its physiologic role is uncertain but may include promotion of appetite. We sought to investigate anticipated differences in adenohypophysial and neurohypophysial ghrelin immunoexpression between normal subjects and patients with anorexia nervosa who had succumbed to complications of the disease. We hypothesized that the glands of anorexia nervosa patients would show relative diminished action in ghrelin content. The study included 12 autopsy-derived pituitaries of anorexia nervosa and 10 control glands. The streptavidin-biotin-peroxidase complex method and double immunohistochemical staining method were used to determine which cell types expressed both ghrelin and adenohypophysial hormones. Nontumorous control pituitaries were also obtained at autopsy. In anorexia nervosa and control adenohypophyses, ghrelin was mainly localized in somatotrophs and to a lesser extent in corticotrophs and gonadotrophs. Ghrelin accumulated within nerve fibers and Herring bodies in the neurohypophysis and pituitary stalk. In the controls, ghrelin expression was apparent in only a few cases. It was mild and only along few nerve fibers. In the adenohypophyses of anorexia nervosa patients, ghrelin was not depleted. It appears that in these patients, ghrelin is transported in excess from the hypothalamic neurohypophysial tract to the neurohypophysis.
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Affiliation(s)
- Fabio Rotondo
- Division of Pathology, Department of Laboratory Medicine, St Michael's Hospital, University of Toronto, 30 Bond Street, Toronto, ON M5B1W8, Canada.
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22
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Yang W, Wang J, Zhu X, Gao Y, Liu Z, Zhang L, Chen H, Shi X, Yang L, Liu G. High lever dietary copper promote ghrelin gene expression in the fundic gland of growing pigs. Biol Trace Elem Res 2012; 150:154-7. [PMID: 22911428 DOI: 10.1007/s12011-012-9477-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Accepted: 07/06/2012] [Indexed: 10/28/2022]
Abstract
This experiment was conducted to examine the effect of dietary copper supplementation on ghrelin mRNA expression level in the fundic gland of growing pigs. A total of 45 crossbred pigs were randomly assigned to three groups of 15 pigs, five replicates of three animals comprised each group. Pigs were allocated to diets that contained 5 mg/kg copper (as the control group), 125 mg/kg copper sulfate, or 125 mg/kg copper methionine. At the end of the experiment, five pigs were selected at random from each group, slaughtered, and collected the fundic gland for determination of ghrelin mRNA expression level. The results showed that average daily gain, average daily feed intake, absolute weight, serum growth hormone (GH) concentration, and ghrelin mRNA level were higher in pigs fed the diets with 125 mg/kg copper methionine and 125 mg/kg copper sulfate (P < 0.05), than in pigs fed a diet with 5 mg/kg copper. These data suggest that high dietary copper (125 mg/kg) appears to increase feed intake and promote weight gain by enhancing the secretion of GH and ghrelin mRNA level in growing pigs.
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Affiliation(s)
- Wenyan Yang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, 130118, China
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23
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Fukumori R, Mita T, Sugino T, Hasegawa Y, Kojima M, Kangawa K, Obitsu T, Taniguchi K. Effects of intravenous ghrelin injection on plasma growth hormone, insulin and glucose concentrations in calves at weaning. Anim Sci J 2012; 84:310-5. [DOI: 10.1111/asj.12001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2012] [Accepted: 07/18/2012] [Indexed: 12/18/2022]
Affiliation(s)
- Rika Fukumori
- Graduate School of Biosphere Science; Hiroshima University; Higashi-Hiroshima
| | - Takako Mita
- Graduate School of Biosphere Science; Hiroshima University; Higashi-Hiroshima
| | - Toshihisa Sugino
- Graduate School of Biosphere Science; Hiroshima University; Higashi-Hiroshima
| | - Yoshihisa Hasegawa
- School of Veterinary Medicine and Animal Science; Kitasato University; Towada
| | | | - Kenji Kangawa
- National Cardiovascular Center Research Institute; Osaka; Japan
| | - Taketo Obitsu
- Graduate School of Biosphere Science; Hiroshima University; Higashi-Hiroshima
| | - Kohzo Taniguchi
- Graduate School of Biosphere Science; Hiroshima University; Higashi-Hiroshima
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24
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Büscher AK, Cetiner M, Büscher R, Wingen AM, Hauffa BP, Hoyer PF. Obesity in patients with Bardet-Biedl syndrome: influence of appetite-regulating hormones. Pediatr Nephrol 2012; 27:2065-2071. [PMID: 22669322 DOI: 10.1007/s00467-012-2220-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Revised: 05/11/2012] [Accepted: 05/11/2012] [Indexed: 12/22/2022]
Abstract
BACKGROUND Bardet-Biedl syndrome (BBS) is a genetic disorder with obesity as one of the major phenotypic criterion, which is proposed to be of neuroendocrine origin. Therefore, disturbances in appetite-regulating hormones have been considered as causative factors. Acyl ghrelin is an orexigenic hormone, whereas its desacylated form, obestatin, and leptin have the opposite functions. Ghrelin is negatively regulated in relation to nutritional status. The aim of this study was to evaluate the impact of hormone alterations on obesity development in BBS patients. METHODS Total and acylated ghrelin, obestatin, leptin and adiponectin were measured in eight children with BBS. The results were analyzed in relation to auxological parameters [body mass index (BMI), height]. RESULTS The mean BMI was significantly increased in BBS patients compared to the controls. Plasma levels of acylated ghrelin, total ghrelin and obestatin were slightly elevated in BBS patients compared to controls, as was the acyl/total ghrelin ratio. Leptin levels were significantly elevated in BBS patients. CONCLUSION BBS patients lack the negative regulatory mechanisms of appetite-regulating hormones with respect to nutritional status and exhibit resistance to anorexigenic leptin. This results in a shift towards the orexigenic effects of this self-regulating system. These alterations may in part be responsible for the disturbed appetite regulation in BBS patients.
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Affiliation(s)
- Anja K Büscher
- Department of Paediatrics II, Paediatric Nephrology, Endocrinology, Gastroenterology and Transplant Medicine, Children's Hospital, University of Duisburg-Essen, Essen, Germany. .,Paediatrics II, Children's Hospital, University of Duisburg-Essen, Hufelandstraße 55, 45122, Essen, Germany.
| | - Metin Cetiner
- Department of Paediatrics II, Paediatric Nephrology, Endocrinology, Gastroenterology and Transplant Medicine, Children's Hospital, University of Duisburg-Essen, Essen, Germany
| | - Rainer Büscher
- Department of Paediatrics II, Paediatric Nephrology, Endocrinology, Gastroenterology and Transplant Medicine, Children's Hospital, University of Duisburg-Essen, Essen, Germany
| | - Anne-Margret Wingen
- Department of Paediatrics II, Paediatric Nephrology, Endocrinology, Gastroenterology and Transplant Medicine, Children's Hospital, University of Duisburg-Essen, Essen, Germany
| | - Berthold P Hauffa
- Department of Paediatrics II, Paediatric Nephrology, Endocrinology, Gastroenterology and Transplant Medicine, Children's Hospital, University of Duisburg-Essen, Essen, Germany
| | - Peter F Hoyer
- Department of Paediatrics II, Paediatric Nephrology, Endocrinology, Gastroenterology and Transplant Medicine, Children's Hospital, University of Duisburg-Essen, Essen, Germany
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25
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Palouzier-Paulignan B, Lacroix MC, Aimé P, Baly C, Caillol M, Congar P, Julliard AK, Tucker K, Fadool DA. Olfaction under metabolic influences. Chem Senses 2012; 37:769-97. [PMID: 22832483 PMCID: PMC3529618 DOI: 10.1093/chemse/bjs059] [Citation(s) in RCA: 222] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Recently published work and emerging research efforts have suggested that the olfactory system is intimately linked with the endocrine systems that regulate or modify energy balance. Although much attention has been focused on the parallels between taste transduction and neuroendocrine controls of digestion due to the novel discovery of taste receptors and molecular components shared by the tongue and gut, the equivalent body of knowledge that has accumulated for the olfactory system, has largely been overlooked. During regular cycles of food intake or disorders of endocrine function, olfaction is modulated in response to changing levels of various molecules, such as ghrelin, orexins, neuropeptide Y, insulin, leptin, and cholecystokinin. In view of the worldwide health concern regarding the rising incidence of diabetes, obesity, and related metabolic disorders, we present a comprehensive review that addresses the current knowledge of hormonal modulation of olfactory perception and how disruption of hormonal signaling in the olfactory system can affect energy homeostasis.
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Affiliation(s)
- Brigitte Palouzier-Paulignan
- Centre de Recherche des Neurosciences de Lyon, Equipe Olfaction du Codage à la Mémoire, INSERM U 1028/CNRS 5292, Université de Lyon150 Ave. Tony Garnier, 69366, Lyon, Cedex 07,France
- Equal contribution
| | - Marie-Christine Lacroix
- INRA, UR1197 Neurobiologie de l’Olfaction et Modélisation en ImagerieF-78350, Jouy-en-JosasFrance
- IFR 144NeuroSud Paris, 91190 Gif-Sur-YvetteFrance
- Equal contribution
| | - Pascaline Aimé
- Centre de Recherche des Neurosciences de Lyon, Equipe Olfaction du Codage à la Mémoire, INSERM U 1028/CNRS 5292, Université de Lyon150 Ave. Tony Garnier, 69366, Lyon, Cedex 07,France
| | - Christine Baly
- INRA, UR1197 Neurobiologie de l’Olfaction et Modélisation en ImagerieF-78350, Jouy-en-JosasFrance
- IFR 144NeuroSud Paris, 91190 Gif-Sur-YvetteFrance
| | - Monique Caillol
- INRA, UR1197 Neurobiologie de l’Olfaction et Modélisation en ImagerieF-78350, Jouy-en-JosasFrance
- IFR 144NeuroSud Paris, 91190 Gif-Sur-YvetteFrance
| | - Patrice Congar
- INRA, UR1197 Neurobiologie de l’Olfaction et Modélisation en ImagerieF-78350, Jouy-en-JosasFrance
- IFR 144NeuroSud Paris, 91190 Gif-Sur-YvetteFrance
| | - A. Karyn Julliard
- Centre de Recherche des Neurosciences de Lyon, Equipe Olfaction du Codage à la Mémoire, INSERM U 1028/CNRS 5292, Université de Lyon150 Ave. Tony Garnier, 69366, Lyon, Cedex 07,France
| | - Kristal Tucker
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of MedicinePittsburgh, PA 15261USAand
| | - Debra Ann Fadool
- Department of Biological Science, Programs in Neuroscience and Molecular Biophysics, The Florida State UniversityTallahassee, FL 32306-4295USA
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Warzecha Z, Ceranowicz D, Dembiński A, Ceranowicz P, Cieszkowski J, Kuwahara A, Kato I, Dembiński M, Konturek PC. Ghrelin accelerates the healing of cysteamine-induced duodenal ulcers in rats. Med Sci Monit 2012; 18:BR181-7. [PMID: 22534700 PMCID: PMC3560627 DOI: 10.12659/msm.882727] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Background Previous studies have shown that administration of ghrelin exhibits protective and therapeutic effects in the gut. The aim of the present investigation was to examine the influence of ghrelin administration on the course of cysteamine-induced duodenal ulcers, as well as effects on mucosal production of oxygen free radicals and duodenal antioxidant defense. Material/Methods Duodenal ulcers were induced in male Wistar rats by cysteamine administered intragastrically at the dose of 200 mg/kg in 1 ml of saline, 3 times at 4-h intervals. Starting 24 h after the first dose of cysteamine, rats were treated intraperitoneally twice a day with saline or ghrelin given at the dose of 4, 8 or 16 nmol/kg/dose. Seven days after administration of the first dose of cysteamine, the study was terminated. Results Induction of ulcers by cysteamine was accompanied by a reduction in duodenal blood flow, mucosal DNA synthesis and mucosal activity of superoxide dismutase (SOD); whereas mucosal concentration of interleukin-1β and malonyldialdehyde (MDA – an index of lipid peroxidation) were increased. Treatment with ghrelin increased healing rate of duodenal ulcers and enhanced duodenal blood flow, mucosal DNA synthesis and mucosal activity of SOD, and reduced mucosal concentration of interleukin-1β and MDA. Conclusions Treatment with ghrelin increases the healing rate of duodenal ulcers and this effect is related, at least in part, to improvement of duodenal mucosal blood flow, mucosal cell proliferation and antioxidant defense, as well as being related to reduction in mucosal oxidative stress and inflammatory response.
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Affiliation(s)
- Zygmunt Warzecha
- Department of Physiology, Jagiellonian University Medical College, Cracow, Poland
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Yamazaki M, Aizawa S, Tanaka T, Sakai T, Sakata I. Ghrelin increases intracellular Ca2+ concentration in the various hormone-producing cell types of the rat pituitary gland. Neurosci Lett 2012; 526:29-32. [DOI: 10.1016/j.neulet.2012.07.063] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 07/26/2012] [Accepted: 07/31/2012] [Indexed: 12/26/2022]
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Vasileiou I, Patsouras D, Patsouris E, Theocharis S. Ghrelin and toxicity: recent findings and future challenges. J Appl Toxicol 2012; 33:238-45. [PMID: 22887052 DOI: 10.1002/jat.2803] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2012] [Revised: 06/26/2012] [Accepted: 06/26/2012] [Indexed: 12/17/2022]
Abstract
Ghrelin is a novel brain-gut peptide that plays various roles in mammals, including control of food intake and growth hormone release, as well as gastric motility and acid secretion in the gastrointestinal tract. It is mainly secreted by the gastric mucosa, but is also expressed in various other tissues. Different studies confirm the multiple biological roles of and possible protective effects of ghrelin. Multiple in vitro and in vivo studies support the powerful protective action of ghrelin against heart, gastric and liver injury. Moreover, ghrelin has been reported to be beneficial in renal tissue injury and excretory function after ischemia-reperfusion and to exert neuroprotective effects in cerebral ischemic regions. The aim of this review is to summarize and evaluate all the currently available in vivo and in vitro studies regarding the effects of ghrelin on tissue injury induced in different organs and tissues.
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Affiliation(s)
- Ioanna Vasileiou
- First Department of Pathology, National and Kapodistrian University of Athens, Medical School, 75 Mikras Asias Street, GR11527 Goudi, Athens, Greece
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Schellekens H, Finger BC, Dinan TG, Cryan JF. Ghrelin signalling and obesity: at the interface of stress, mood and food reward. Pharmacol Ther 2012; 135:316-26. [PMID: 22749794 DOI: 10.1016/j.pharmthera.2012.06.004] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 06/07/2012] [Indexed: 12/14/2022]
Abstract
The neuronal circuitry underlying the complex relationship between stress, mood and food intake are slowly being unravelled and several studies suggest a key role herein for the peripherally derived hormone, ghrelin. Evidence is accumulating linking obesity as an environmental risk factor to psychiatric disorders such as stress, anxiety and depression. Ghrelin is the only known orexigenic hormone from the periphery to stimulate food intake. Plasma ghrelin levels are enhanced under conditions of physiological stress and ghrelin has recently been suggested to play an important role in stress-induced food reward behaviour. In addition, chronic stress or atypical depression has often demonstrated to correlate with an increase in ingestion of caloric dense 'comfort foods' and have been implicated as one of the major contributor to the increased prevalence of obesity. Recent evidence suggests ghrelin as a critical factor at the interface of homeostatic control of appetite and reward circuitries, modulating the hedonic aspects of food intake. Therefore, the reward-related feeding of ghrelin may reveal itself as an important factor in the development of addiction to certain foods, similar to its involvement in the dependence to drugs of abuse, including alcohol. This review will highlight the accumulating evidence demonstrating the close interaction between food, mood and stress and the development of obesity. We consider the ghrelinergic system as an effective target for the development of successful anti-obesity pharmacotherapies, which not only affects appetite but also selectively modulates the rewarding properties of food and impact on psychological well-being in conditions of stress, anxiety and depression.
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Abstract
PURPOSE OF REVIEW Recovery and rehabilitation after critical illness is a vital part of intensive care management. The role of feeding and nutritional intervention is the subject of many recent studies. The gastric hormone ghrelin has effects on appetite and food intake and on immunomodulatory functions. Here we review the interactions between critical illness, appetite regulation, nutrition and ghrelin. RECENT FINDINGS Critical illness results in significant loss of lean body mass; strategies to prevent this have so far proven unsuccessful. Ghrelin has been shown to reduce catabolic protein loss in animal models of critical illness and improve body composition in chronic cachectic illnesses in humans. SUMMARY Enhancing recovery from critical illness will improve both short-term and long-term outcomes. Ghrelin may offer an important means of improving appetite, muscle mass and rehabilitation in the period after critical illness, although studies are needed to see whether this potential is realized.
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Hage MP, Safadi B, Salti I, Nasrallah M. Role of Gut-Related Peptides and Other Hormones in the Amelioration of Type 2 Diabetes after Roux-en-Y Gastric Bypass Surgery. ISRN ENDOCRINOLOGY 2012; 2012:504756. [PMID: 22619730 PMCID: PMC3353119 DOI: 10.5402/2012/504756] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Accepted: 02/06/2012] [Indexed: 12/15/2022]
Abstract
Bariatric surgery is currently the most effective and durable therapy for obesity. Roux-en-Y gastric bypass surgery, the most commonly performed procedure worldwide, causes substantial weight loss and improvement in several comorbidities associated with obesity, especially type 2 diabetes. Several mechanisms are proposed to explain the improvement in glucose metabolism after RYGB surgery: the caloric restriction and weight loss per se, the improvement in insulin resistance and beta cell function, and finally the alterations in the various gastrointestinal hormones and adipokines that have been shown to play an important role in glucose homeostasis. However, the timing, exact changes of these hormones, and the relative importance of these changes in the metabolic improvement postbariatric surgery remain to be further clarified. This paper reviews the various changes post-RYGB in adipokines and gut peptides in subjects with T2D.
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Affiliation(s)
- Mirella P Hage
- Division of Endocrinology, Department of Internal Medicine, American University of Beirut-Medical Center, P.O. Box 11-0236/D23 Riad El-Solh, Beirut 1107 2020, Lebanon
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Akamizu T, Kangawa K. The physiological significance and potential clinical applications of ghrelin. Eur J Intern Med 2012; 23:197-202. [PMID: 22385874 DOI: 10.1016/j.ejim.2011.12.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Revised: 11/30/2011] [Accepted: 12/06/2011] [Indexed: 12/24/2022]
Abstract
Ghrelin, a natural ligand for the growth hormone (GH)-secretagogue receptor (GHS-R), is now known to play a role in a number of different physiological processes. For example, ghrelin increases GH secretion, feeding, and body weight when administered centrally or peripherally. These unique effects of ghrelin should be invaluable for the development of novel treatments and disease diagnostic techniques. Clinical trials have already been performed to assess the utility of ghrelin for the treatment of several disorders including anorexia, cachexia, and GH-related disorders. This review summarizes the recent advances in this area of research.
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Affiliation(s)
- Takashi Akamizu
- Ghrelin Research Project, Department of Experimental Therapeutics, Translational Research Center, Kyoto University Hospital, Kyoto University School of Medicine, Kyoto 606-8507, Japan.
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Gao M, Yang J, Liu G, Wei R, Zhang L, Wang H, Wang G, Gao H, Chen G, Hong T. Ghrelin promotes the differentiation of human embryonic stem cells in infarcted cardiac microenvironment. Peptides 2012; 34:373-9. [PMID: 22386650 DOI: 10.1016/j.peptides.2012.02.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Revised: 02/04/2012] [Accepted: 02/06/2012] [Indexed: 11/23/2022]
Abstract
Ghrelin is broadly expressed in myocardial tissues, where it exerts different functions. It also has been found to have a wide variety of biological functions on cell differentiation and tissue development. The aim of this study was to investigate the effect of ghrelin on human embryonic stem cell (hESC) differentiation in infarcted cardiac microenvironment. The hESCs grown on feeder layers expressed several pluripotential markers including alkaline phosphatase (AKP). Four weeks after transplantation into rat infarcted hearts, the hESCs and their progeny cells survived and formed intracardiac grafts were 54.7% and 19.6% respectively in ghrelin- and phosphate-buffered saline (PBS)-treated groups. Double immunostaining with anti-human Sox9 and anti-HNA or anti-human fetal liver kinase-1 (Flk1) and anti β-tubulin showed that the human grafts were in development. However, double positive stains were only found in the ghrelin-treated group. In addition, the hESC injection protocol was insufficient to restore heart function of the acute myocardial infarction model. Our study, therefore, provides a new insight of ghrelin on promoting hESC survival and differentiation in rat infarcted cardiac microenvironment. This may give a clue for therapy for myocardial infarction by hESCs or progeny cells.
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Affiliation(s)
- Meijuan Gao
- Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing 100191, China
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Savino F, Lupica MM, Liguori SA, Fissore MF, Silvestro L. Ghrelin and feeding behaviour in preterm infants. Early Hum Dev 2012; 88 Suppl 1:S51-5. [PMID: 22285781 DOI: 10.1016/j.earlhumdev.2011.12.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The importance of early life events in the development of metabolic diseases is well recognized. Early postnatal environment, including nutrition, is key to future health, and this is particularly true for preterm infants. It is important that these infants receive sufficient nutrients to prevent growth restriction and promote neurodevelopment, while minimizing predisposition to metabolic diseases later in life. Feeding habits are the fundamental elements of nutrition and are influenced by many factors, including personal and familial habits, socioeconomic status, and cultural environment. In the last decades, there has been an important scientific interest toward the comprehension of the molecular and neural mechanisms regulating appetite. In these networks, act many peptide hormones produced in brain or gut, among which ghrelin is important because of its action in the short-term regulation of food intake and the long-term regulation of body weight. Ghrelin stimulates appetite and plays a role in regulating feeding behaviour. Ghrelin levels vary from fetal life through to early adulthood, with the highest levels observed in the very early years. Cord ghrelin levels have been evaluated in term and preterm newborns and high ghrelin levels have been observed in small-for-gestational age newborns and in newborns with intrauterine growth restriction. Moreover, ghrelin has been detected in term and preterm human breast milk, suggesting that it may play a role in the development of neuroendocrine pathways regulating appetite and energy homeostasis in early life. However, more research is required to better define ghrelin's role in breast milk and on feeding behaviour.
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Affiliation(s)
- Francesco Savino
- Department of Paediatrics, Regina Margherita Children's Hospital, University of Turin, Italy.
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Distribution of ghrelin-producing cells in the gastrointestinal tract of pigs at different ages. Vet Res Commun 2012; 36:71-80. [PMID: 22281862 DOI: 10.1007/s11259-012-9517-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/13/2012] [Indexed: 10/24/2022]
Abstract
Ghrelin is involved in many biological processes, ranging from appetite regulation and the release of growth hormone to the regulation of gastrointestinal motility and secretion processes. Ghrelin expression is not homogenously distributed throughout the gastrointestinal tract; expression is species-specific and can also depend on the animal age. This study was performed to investigate ghrelin immunolocalization in the gastrointestinal tract of pigs at different ages: 1 day (birth), 28 days (weaning), 2 months, 4 months, and 7 months (pre-puberty). Tissue samples were collected along the entire gastrointestinal tract and were examined by immunohistochemistry and double-immunofluorescence. Histometry was performed by counting the number of endocrine ghrelin immunopositive cells in the gastrointestinal mucosa. Ghrelin was found to be present along the swine alimentary canal from the stomach to the caecum. In all regions of the alimentary canal of the animals studied, ghrelin-immunoreactive (IR) cells co-localized with chromogranin-A and were therefore identified as endocrine cells. In the gastric fundus, ghrelin-immunoreactivity was partially detected in co-localization with H-K-adenosine triphosphatase and pepsinogen. Ghrelin-IR endocrine cells were abundant in the oxyntic mucosa but less present in the small intestine and rare in the large intestine. The cell density of the ghrelin-IR endocrine cells was lowest in the oxyntic mucosa of 1-day-old pigs. We can conclude that gastric ghrelin expression is not related merely to age but could also potentially be influenced by food intake.
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Goto M, Inoue K, Tanaka T, Kaneko Y, Goto A, Imai K, Ihana N, Tsujimoto T, Kosuga Y, Seki Y, Kasama K, Yasuda K, Kishimoto M, Takahashi Y, Kajio H, Noda M. A morbid obese Japanese woman with a body mass index of 83.2 kg/m2: before and after sleeve gastrectomy. Intern Med 2012; 51:969-75. [PMID: 22504261 DOI: 10.2169/internalmedicine.51.7010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A 34-year-old Japanese woman presented at our institution weighing 182.7 kg, 148.2 cm tall, and with a body mass index of 83.2 kg/m(2). She had been overweight since childhood, but no abnormality was found to explain her obesity. Treatments, including mazindol, bofu-tsusho-san, dietary restriction, and BioEnterics Intragastric Balloon, did not result in improvement of her obesity. Finally, we performed sleeve gastrectomy, and she has maintained her weight within 130-140 kg without rebounding for 2 and a half years. We followed the clinical changes before and after the operation. This case provides potentially interesting information regarding operative treatment for morbid obesity in Japanese.
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Affiliation(s)
- Maki Goto
- Department of Diabetes and Metabolic Medicine, National Center for Global Health and Medicine, Japan
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Prodam F, Genoni G, Bellone S, Longhi S, Agarla V, Bona G, Radetti G. Effect of Arginine Infusion on Ghrelin Secretion in Growth Hormone Sufficient and GH Deficient Children. Int J Endocrinol Metab 2012; 10:470-4. [PMID: 23843806 PMCID: PMC3693617 DOI: 10.5812/ijem.3826] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Revised: 01/28/2012] [Accepted: 02/04/2012] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND The physiological link between ghrelin and growth hormone (GH) has not yet been fully clarified. Furthermore, the existence of a negative feedback mechanism between growth hormone-insulin-like growth factor (GH-IGF)-I axis and ghrelin and the influence of amino acids on ghrelin secretion in children remain matters of debate. OBJECTIVES To understand the regulation of ghrelin secretion and clarify the relationship between ghrelin and GH secretion in GH-deficient (GHD) and GH-sufficient (GHS) children. PATIENTS AND METHODS Ten GHD (male/female [M/F], 6/4; age [mean ± SEM], 10.7 ± 0.9 years) and 10 GHS prepubertal children (M/F, 6/4; age [mean ± SEM], 10.3 ± 0.6 years), underwent an arginine (ARG) test (infusion, 0.5 g/kg, iv). Levels of GH, total ghrelin, and acylated ghrelin (AG) were assayed every 30 min from 0 to +120 min. RESULTS Peak GH values were lower in GHD subjects than in GHS subjects (P < 0.0001). The baseline levels, peak levels, or area under the curves (AUC) for total ghrelin and AG were similar between GHD and GHS children. ARG infusion was followed by a slight to significant decrease in total ghrelin levels, but not AG levels, both in GHD and GHS subjects with a nadir at +30 min. No correlation was seen between GH, total ghrelin, or AG response and ARG infusion. CONCLUSIONS Total ghrelin and AG levels seemed unaffected by GH status in prepubertal children. ARG infusion was unable to blunt ghrelin secretion irrespective of GH status in childhood. Moreover, since ARG influences GH secretion via modulation of somatostatin release, ghrelin secretion seems to be partially refractory to somatostatin action.
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Affiliation(s)
- Flavia Prodam
- Division of Pediatrics, Department of Medical Sciences, University of Piemonte Orientale, Novara, Italy
- Endocrinology, Department of Clinical and Experimental Medicine, University of Piemonte Orientale, Novara, Italy
| | - Giulia Genoni
- Division of Pediatrics, Department of Medical Sciences, University of Piemonte Orientale, Novara, Italy
| | - Simonetta Bellone
- Division of Pediatrics, Department of Medical Sciences, University of Piemonte Orientale, Novara, Italy
| | - Silvia Longhi
- Department of Pediatrics, Regional Hospital of Bolzano, Bolzano, Italy
| | - Valentina Agarla
- Division of Pediatrics, Department of Medical Sciences, University of Piemonte Orientale, Novara, Italy
| | - Gianni Bona
- Division of Pediatrics, Department of Medical Sciences, University of Piemonte Orientale, Novara, Italy
| | - Giorgio Radetti
- Department of Pediatrics, Regional Hospital of Bolzano, Bolzano, Italy
- Corresponding author: Giorgio Radetti, Department of Pediatrics, Regional Hospital of Bolzano, via L. Boehler 5, 39100, Bolzano, Italy. Tel.: +39-0471908651, Fax: +39-0471909730, E-mail:
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Clinical Application of Ghrelin for Chronic Respiratory Diseases. Methods Enzymol 2012. [DOI: 10.1016/b978-0-12-381272-8.00025-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Cetin N, Boyraz U, Cetin E. Ghrelin Alleviates Tilmicosin-Induced Myocardial Oxidative Stress in Rats. ACTA ACUST UNITED AC 2011. [DOI: 10.3923/javaa.2011.2038.2042] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Sato T, Nakamura Y, Shiimura Y, Ohgusu H, Kangawa K, Kojima M. Structure, regulation and function of ghrelin. J Biochem 2011; 151:119-28. [PMID: 22041973 DOI: 10.1093/jb/mvr134] [Citation(s) in RCA: 144] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Ghrelin is a stomach hormone that acts as an endogenous ligand of orphan G-protein-coupled receptor. Ghrelin is a 28-amino acid peptide existing in two major forms: n-octanoyl-modified ghrelin, which possesses an n-octanoyl modification on serine-3 and des-acyl ghrelin. Fatty acid modification of ghrelin is essential for ghrelin-induced growth hormone release from the pituitary and appetite stimulation. This acyl-modification of ghrelin is catalysed by ghrelin-O-acyl transferase recently identified. Despite the number of innovative advancements in this field of research, there are still many aspects of ghrelin function and biosynthesis process that remain to be clarified. Here, we review the current understanding of the structure, regulation and function of ghrelin; this review is intended for researchers who will be involved in this field in the future.
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Affiliation(s)
- Takahiro Sato
- Institute of Life Science, Kurume University, Kurume 839-0864, Japan.
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Han X, Zhu Y, Zhao Y, Chen C. Ghrelin reduces voltage-gated calcium currents in GH₃ cells via cyclic GMP pathways. Endocrine 2011; 40:228-36. [PMID: 21874320 DOI: 10.1007/s12020-011-9520-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2011] [Accepted: 07/27/2011] [Indexed: 10/17/2022]
Abstract
Ghrelin is an endogenous growth hormone secretagogue (GHS) causing release of GH from pituitary somatotropes through the GHS receptor. Secretion of GH is linked directly to intracellular free Ca2+ concentration ([Ca2+]i), which is determined by Ca2+ influx and release from intracellular Ca2+ storage sites. Ca2+ influx is via voltage-gated Ca2+ channels, which are activated by cell depolarization. The mechanism underlying the effect of ghrelin on voltage-gated Ca2+ channels is still not clear. In this report, using whole cell patch-clamp recordings, we assessed the acute action of ghrelin on voltage-activated Ca2+ currents in GH3 rat somatotrope cell line. Ca2+ currents were divided into three types (T, N, and L) through two different holding potentials (-80 and -40 mV) and specific L-type channel blocker (nifedipine, NFD). We demonstrated that ghrelin significantly and reversibly decreases all three types of Ca2+ currents in GH3 cells through GHS receptors on the cell membrane and down-stream signaling systems. With different signal pathway inhibitors, we observed that ghrelin-induced reduction in voltage-gated Ca2+ currents in GH3 cells was mediated by a protein kinase G-dependent pathways. As ghrelin also stimulates Ca2+ release and prolongs the membrane depolarization, this reduction in voltage-gated Ca2+ currents may not be translated into a reduction in [Ca2+]i, or a decrease in GH secretion.
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Affiliation(s)
- Xuefeng Han
- Department of Physiology, Fourth Military Medical University, Shannxi, China
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Fahim MA, Kataya H, El-Kharrag R, Amer DAM, al-Ramadi B, Karam SM. Ghrelin attenuates gastrointestinal epithelial damage induced by doxorubicin. World J Gastroenterol 2011; 17:3836-41. [PMID: 21987627 PMCID: PMC3181446 DOI: 10.3748/wjg.v17.i33.3836] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 03/05/2011] [Accepted: 03/12/2011] [Indexed: 02/06/2023] Open
Abstract
AIM: To examine the influence of ghrelin on the regenerative potential of gastrointestinal (GI) epithelium.
METHODS: Damage to GI epithelium was induced in mice by two intravenous injections of doxorubicin (10 and 6 mg/kg). Some of the doxorubicin-treated mice received a continuous subcutaneous infusion of ghrelin (1.25 μg/h) for 10 d via implanted mini-osmotic pumps. To label dividing stem cells in the S-phase of the cell cycle, all mice received a single intraperitoneal injection of 5’-bromo-2’-deoxyuridine (BrdU) one hour before sacrifice. The stomach along with the duodenum were then removed and processed for histological examination and immunohistochemistry using anti-BrdU antibody.
RESULTS: The results showed dramatic damage to the GI epithelium 3 d after administration of chemotherapy which began to recover by day 10. In ghrelin-treated mice, attenuation of GI mucosal damage was evident in the tissues examined post-chemotherapy. Immunohistochemical analysis showed an increase in the number of BrdU-labeled cells and an alteration in their distribution along the epithelial lining in response to damage by doxorubicin. In mice treated with both doxorubicin and ghrelin, the number of BrdU-labeled cells was reduced when compared with mice treated with doxorubicin alone.
CONCLUSION: The present study suggests that ghrelin enhances the regenerative potential of the GI epithelium in doxorubicin-treated mice, at least in part, by modulating cell proliferation.
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Blanco Martínez de Morentin P, González CR, Saha AK, Martins L, Diéguez C, Vidal-Puig A, Tena-Sempere M, López M. Hypothalamic AMP-activated protein kinase as a mediator of whole body energy balance. Rev Endocr Metab Disord 2011; 12:127-40. [PMID: 21347863 DOI: 10.1007/s11154-011-9165-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The AMP-activated protein kinase (AMPK) is the downstream constituent of a kinase cascade that acts as a sensor of cellular energy levels. Current data unequivocally indicate that hypothalamic AMPK plays a key role in the control of the whole body energy balance, by integrating peripheral signals, such as hormones and metabolites, with central signals, such as neuropeptides, and eliciting allostatic changes in energy homeostasis. Although the molecular details of these interactions are not fully understood, recent evidence has suggested that the interaction between AMPK with hypothalamic lipid metabolism and other metabolic sensors, such as the uncoupling protein 2 (UCP-2), the mammalian target of rapamycin (mTOR) and the deacetylase sirtuin 1 (SIRT1), may play a main role in the hypothalamic control of feeding and energy expenditure. Here, we summarize the role of hypothalamic AMPK as whole body energy gauge. Understanding this key molecule and especially its functions at central level may provide new therapeutic targets for the treatment of metabolic alterations and obesity.
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Affiliation(s)
- Pablo Blanco Martínez de Morentin
- Department of Physiology, School of Medicine, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, A Coruña, Spain.
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Repaci A, Gambineri A, Pagotto U, Pasquali R. Ghrelin and reproductive disorders. Mol Cell Endocrinol 2011; 340:70-9. [PMID: 21453749 DOI: 10.1016/j.mce.2011.02.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 02/26/2011] [Accepted: 02/26/2011] [Indexed: 12/13/2022]
Abstract
Ghrelin is an important factor involved in most of the metabolic and hormonal signals which adapt the reproductive functions in conditions of altered energy balance. Moreover, the coordinated role of leptin and ghrelin appears in fact to have a specific role in the regulation of puberty. Systemic action of ghrelin on the reproductive axis involves the control of the hypothalamic-pituitary-gondal axis. In addition, it has been shown that ghrelin may directly act at a gonadal level in both females and males. Available data also demonstrate that sex steroid hormones and gonadotropins may in turn regulate the gonadal effect of ghrelin, as documented by studies performed in females with the polycystic ovary syndrome and in hypogonadal men. Notably, recent studies also confirm a potentially important role for ghrelin in fetal and neonatal energy balance, and specifically in allowing fetal adaptation to an adverse intrauterine environment.
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Affiliation(s)
- Andrea Repaci
- St. Orsola-Malpighi Hospital, University Alma Mater Studiorum, Bologna, Italy
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45
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Breast milk hormones and regulation of glucose homeostasis. Int J Pediatr 2011; 2011:803985. [PMID: 21760816 PMCID: PMC3133796 DOI: 10.1155/2011/803985] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Accepted: 02/28/2011] [Indexed: 01/22/2023] Open
Abstract
Growing evidence suggests that a complex relationship exists between the central nervous system and peripheral organs involved in energy homeostasis. It consists in the balance between food intake and energy expenditure and includes the regulation of nutrient levels in storage organs, as well as in blood, in particular blood glucose. Therefore, food intake, energy expenditure, and glucose homeostasis are strictly connected to each other. Several hormones, such as leptin, adiponectin, resistin, and ghrelin, are involved in this complex regulation. These hormones play a role in the regulation of glucose metabolism and are involved in the development of obesity, diabetes, and metabolic syndrome. Recently, their presence in breast milk has been detected, suggesting that they may be involved in the regulation of growth in early infancy and could influence the programming of energy balance later in life. This paper focuses on hormones present in breast milk and their role in glucose homeostasis.
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Adams CE, Greenway FL, Brantley PJ. Lifestyle factors and ghrelin: critical review and implications for weight loss maintenance. Obes Rev 2011; 12:e211-8. [PMID: 20604869 DOI: 10.1111/j.1467-789x.2010.00776.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Ghrelin, the only known appetite-stimulating hormone in humans, may be one factor involved in increased appetite, cravings and food intake following weight loss. Innovative strategies for suppressing ghrelin and decreasing appetite during weight loss maintenance are needed. Recent research has highlighted relationships between ghrelin, stress and lifestyle factors. The purposes of the current review are to (i) describe the current status of knowledge about ghrelin and lifestyle factors; (ii) critically examine research in this area, highlighting inconsistencies and methodological issues and (iii) discuss future directions and implications for obesity treatment. Based on Literature search using PsycINFO and Medline databases, we reviewed experimental studies on relationships between ghrelin, stress, exercise and sleep. Ghrelin levels are positively related to stress hormones, and stress management interventions including exercise and sleep may help to reduce acylated ghrelin and corresponding appetite. Behavioural interventions may offer a practical, cost-effective alternative for reducing or stabilizing ghrelin levels after initial weight loss. Adding behavioural techniques designed to reduce ghrelin to traditional weight loss maintenance protocols may help individuals to maintain weight loss. Future directions for investigating relationships between ghrelin and behavioural factors, examining the efficacy of behavioural programmes in reducing ghrelin and improving weight loss maintenance are discussed.
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Affiliation(s)
- C E Adams
- Department of Psychology, Louisiana State University Pennington Biomedical Research Center, Baton Rouge, LA, USA
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Coiro V, Volpi R, Stella A, Cataldo S, Chiodera P. Oxytocin does not modify GH, ACTH, cortisol and prolactin responses to Ghrelin in normal men. Neuropeptides 2011; 45:139-42. [PMID: 21277631 DOI: 10.1016/j.npep.2010.12.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Revised: 12/02/2010] [Accepted: 12/27/2010] [Indexed: 11/16/2022]
Abstract
BACKGROUND In order to test the possible effect of Oxytocin (OT) on Ghrelin-stimulated GH, PRL, ACTH and cortisol, ten healthy normal men were studied. TESTS Ghrelin (0.2 μg/kg body weight (BW)) as an iv bolus; Ghrelin plus OT (2 IU as bolus plus 0.07 IU/min administered for 90 min). RESULTS The administration of OT did not change GH, PRL, ACTH and cortisol release induced by Ghrelin. CONCLUSIONS The data suggests that in humans OT did not modulate the GH, PRL, ACTH and cortisol response to Ghrelin.
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Affiliation(s)
- Vittorio Coiro
- Department of Internal Medicine and Biomedical Sciences, University of Parma, Parma, Italy.
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Tesauro M, Canale MP, Rodia G, Di Daniele N, Lauro D, Scuteri A, Cardillo C. Metabolic syndrome, chronic kidney, and cardiovascular diseases: role of adipokines. Cardiol Res Pract 2011; 2011:653182. [PMID: 21403882 PMCID: PMC3051177 DOI: 10.4061/2011/653182] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Revised: 11/30/2010] [Accepted: 01/07/2011] [Indexed: 01/14/2023] Open
Abstract
Obesity is a chronic disease, whose incidence is alarmingly growing. It is associated with metabolic abnormalities and cardiovascular complications. These complications are clustered in the metabolic syndrome (MetS) leading to high cardiovascular morbidity and mortality. Obesity predisposes to diabetic nephropathy, hypertensive nephrosclerosis, and focal and segmental glomerular sclerosis and represents an independent risk factor for the development and progression of chronic kidney disease (CKD). Albuminuria is a major risk factor for cardiovascular diseases (CVDs). Microalbuminuria has been described as early manifestation of MetS-associated kidney damage and diabetic nephropathy. Obesity and MetS affect renal physiology and metabolism through mechanisms which include altered levels of adipokines such as leptin and adiponectin, oxidative stress, and inflammation. Secretory products of adipose tissue also deeply and negatively influence endothelial function. A better understanding of these interactions will help in designing more effective treatments aimed to protect both renal and cardiovascular systems.
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Affiliation(s)
- Manfredi Tesauro
- Department of Medicina Interna, Università di Tor Vergata, Viale Oxford 81, 00133 Rome, Italy
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FUKUMORI R, YOKOTANI A, SUGINO T, ITOH F, KUSHIBIKI S, SHINGU H, MORIYA N, HASEGAWA Y, KOJIMA M, KANGAWA K, OBITSU T, TANIGUCHI K. Effects of amino acids infused into the vein on ghrelin-induced GH, insulin and glucagon secretion in lactating cows. Anim Sci J 2011; 82:267-73. [DOI: 10.1111/j.1740-0929.2010.00838.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
PURPOSE OF REVIEW Disturbances in gastrointestinal hormones have been implicated in the pathogenesis of eating disorders such as anorexia nervosa and bulimia nervosa. However, the contribution of these hormonal changes to the onset and maintenance of eating disorder remains unclear. We focus our review on a selective number of gastrointestinal hormones that are known to play a role in the regulation of short-term or long-term energy balance and examine their association with eating disorder in recently published literature. RECENT FINDINGS Several new studies reported differential changes of ghrelin isoforms during fasting and following nutrient ingestion. New findings on other appetite-regulating hormones (peptide YY, cholecystokinin, incretin hormones and pancreatic polypeptide) at different nutritional states and disease stage have also been reported in subtypes of eating disorder. Most of the changes in peripheral hormones disappeared or partially recovered after the restoration of weight with nutritional and behavioral therapy. SUMMARY Dysregulation of gastrointestinal hormones is more likely to contribute to the maintenance of the disordered eating behavior and related metabolic outcomes as well as the clinical course rather than causing them. A better understanding of this relationship also carries implications for developing targeted hormone-base treatment for eating disorder.
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Affiliation(s)
- Jenny Tong
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, University of Cincinnati, Cincinnati, Ohio, USA
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