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Williamson M, Lupi S, MacDougall-Shackleton SA. Effects of ghrelin on food caching behaviour and body composition in black-capped chickadees (Poecile atricapillus). Gen Comp Endocrinol 2024; 351:114475. [PMID: 38382621 DOI: 10.1016/j.ygcen.2024.114475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 02/10/2024] [Accepted: 02/17/2024] [Indexed: 02/23/2024]
Abstract
Several metabolic hormones signal an organism's energy balance to the brain and modulate feeding behaviours accordingly. These metabolic signals may also regulate other behaviour related to energy balance, such as food caching or hoarding. Ghrelin is one such hormone, but it appears to exert different effects on appetite and fat levels in birds and mammals. Ghrelin treatment inhibits food intake and decreases fat stores in some bird species, but these effects may differ between acylated and unacylated (des-acyl) forms of ghrelin. The effect of ghrelin on food caching in birds has been examined in only one study, that found both leptin and unacylated ghrelin reduced food caching and mass gain in coal tits (Periparus ater). We expanded on this to test how both forms of ghrelin affect food caching and body composition in black-capped chickadees (Poecile atricapillus). We injected each bird with acylated ghrelin, unacylated ghrelin, and a saline control and then measured food caching every 20 min for two hours post-injection. We also measured body mass fat levels the day before, and after treatment using quantitative magnetic resonance (QMR). Contrary to prior work, we found no effects of either form of ghrelin on food caching, or body or fat mass. Future work is required to determine if the difference between our results and those of the prior study stems from species differences in response to ghrelin and/or in the motivation to cache food, or ghrelin effects being modulated by energy reserves.
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Affiliation(s)
- Matthew Williamson
- Departments of Psychology and Advanced Facility for Avian Research, University of Western Ontario, Canada
| | - Sara Lupi
- Departments of Biology Advanced Facility for Avian Research, University of Western Ontario, Canada
| | - Scott A MacDougall-Shackleton
- Departments of Psychology and Advanced Facility for Avian Research, University of Western Ontario, Canada; Departments of Biology Advanced Facility for Avian Research, University of Western Ontario, Canada.
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2
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Jinnouchi H, Yoshida A, Tsuyuno H, Iwamoto K, Sugiyama S, Hieshima K, Kajiwara K, Kurinami N, Suzuki T, Jinnouchi K, Jinnouchi T. Changes in urinary glucose concentration and body weight in patients treated with the selective SGLT2 inhibitor luseogliflozin. Diabetes Res Clin Pract 2021; 182:108916. [PMID: 34119556 DOI: 10.1016/j.diabres.2021.108916] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 05/26/2021] [Accepted: 06/03/2021] [Indexed: 10/21/2022]
Abstract
AIMS We investigated the effects of the SGLT2 inhibitor luseogliflozin on blood and urinary glucose and body weight. METHODS Luseogliflozin 2.5 mg was administered once daily for 24 weeks to 30 outpatients with type 2 diabetes. Urinary glucose concentration, continuous glucose monitoring values, HbA1c, fasting glucose, and body weight were evaluated. Correlations with urinary glucose, subcutaneous/visceral fat mass, insulin, EPA/AA ratio, plasma free fatty acids, ghrelin, blood ketones, plasma 1,5-anhydro-D-glucitol were evaluated. RESULTS Urinary glucose significantly increased from 11.1 ± 11.8 g at Week -4 to 84.5 ± 46.8 g at Week 24. HbA1c significantly declined from 7.88 ± 0.88% to 7.36 ± 1.13% at Week 24. Mean blood glucose significantly decreased from 149.6 ± 41.8 to 131.6 ± 31.1 mg/dL at Week 24. Subcutaneous and visceral fat mass was also significantly decreased, as were AST and ALT (P < 0.01). Blood urea nitrogen was significantly increased, and urate significantly decreased from 5.04 ± 1.07 to 4.53 ± 0.94 mg/dL. The homeostasis model assessment ratio remained significantly improved throughout the treatment period. Acyl ghrelin levels remained constant but des-acyl ghrelin increased significantly. CONCLUSIONS Luseogliflozin monotherapy resulted in an improvement in blood glucose, a decrease in body weight, and decreased insulin resistance. Luseogliflozin appears to be an effective therapy for obese diabetics.
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Affiliation(s)
- Hideaki Jinnouchi
- Diabetes Care Center, Jinnouchi Hospital, Kumamoto City, Kumamoto, Japan.
| | - Akira Yoshida
- Diabetes Care Center, Jinnouchi Hospital, Kumamoto City, Kumamoto, Japan
| | - Hiromi Tsuyuno
- Diabetes Care Center, Jinnouchi Hospital, Kumamoto City, Kumamoto, Japan
| | - Kiyoko Iwamoto
- Diabetes Care Center, Jinnouchi Hospital, Kumamoto City, Kumamoto, Japan
| | - Seigo Sugiyama
- Diabetes Care Center, Jinnouchi Hospital, Kumamoto City, Kumamoto, Japan
| | - Kunio Hieshima
- Diabetes Care Center, Jinnouchi Hospital, Kumamoto City, Kumamoto, Japan
| | - Keizo Kajiwara
- Diabetes Care Center, Jinnouchi Hospital, Kumamoto City, Kumamoto, Japan
| | - Noboru Kurinami
- Diabetes Care Center, Jinnouchi Hospital, Kumamoto City, Kumamoto, Japan
| | - Tomoko Suzuki
- Diabetes Care Center, Jinnouchi Hospital, Kumamoto City, Kumamoto, Japan
| | | | - Tomio Jinnouchi
- Diabetes Care Center, Jinnouchi Hospital, Kumamoto City, Kumamoto, Japan
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Abtahi S, Howell E, Salvucci JT, Bastacky JMR, Dunn DP, Currie PJ. Exendin-4 antagonizes the metabolic action of acylated ghrelinergic signaling in the hypothalamic paraventricular nucleus. Gen Comp Endocrinol 2019; 270:75-81. [PMID: 30336120 PMCID: PMC6886705 DOI: 10.1016/j.ygcen.2018.10.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 09/19/2018] [Accepted: 10/14/2018] [Indexed: 12/11/2022]
Abstract
In the current study we investigated the interaction of hypothalamic paraventricular nucleus (PVN) glucagon-like peptide-1 (GLP-1) and ghrelin signaling in the control of metabolic function. We first demonstrated that acylated ghrelin injected directly into the PVN reliably altered the respiratory exchange ratio (RER) of adult male Sprague Dawley rats. All testing was carried out during the initial 2 h of the nocturnal cycle using an indirect open circuit calorimeter. Results indicated that acylated ghrelin induced a robust increase in RER representing a shift toward enhanced carbohydrate oxidation and reduced lipid utilization. In contrast, treatment with comparable dosing of des-acyl ghrelin failed to significantly impact metabolic activity. In separate groups of rats we subsequently investigated the ability of exendin-4 (Ex-4), a GLP-1 analogue, to alter acylated ghrelin's metabolic effects. Rodents were treated with either systemic or direct PVN Ex-4 followed by acyl ghrelin microinjection. While our results showed that both systemic and PVN administration of Ex-4 significantly reduced RER, importantly, Ex-4 pretreatment itself reliably inhibited the impact of ghrelin on RER. Overall, these findings provide increasingly compelling evidence that GLP-1 and ghrelin signaling interact in the neural control of metabolic function within the PVN.
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Affiliation(s)
- Shayan Abtahi
- Department of Psychology, Reed College, 3203 SE Woodstock Blvd., Portland, OR 97202, United States
| | - Erin Howell
- Department of Psychology, Reed College, 3203 SE Woodstock Blvd., Portland, OR 97202, United States
| | - Jack T Salvucci
- Department of Psychology, Reed College, 3203 SE Woodstock Blvd., Portland, OR 97202, United States
| | - Joshua M R Bastacky
- Department of Psychology, Reed College, 3203 SE Woodstock Blvd., Portland, OR 97202, United States
| | - David P Dunn
- Department of Psychology, Reed College, 3203 SE Woodstock Blvd., Portland, OR 97202, United States
| | - Paul J Currie
- Department of Psychology, Reed College, 3203 SE Woodstock Blvd., Portland, OR 97202, United States.
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Yoshino Y, Funahashi Y, Nakata S, Ozaki Y, Yamazaki K, Yoshida T, Mori T, Mori Y, Ochi S, Iga JI, Ueno SI. Ghrelin cascade changes in the peripheral blood of Japanese patients with Alzheimer's disease. J Psychiatr Res 2018; 107:79-85. [PMID: 30366284 DOI: 10.1016/j.jpsychires.2018.10.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 10/17/2018] [Accepted: 10/18/2018] [Indexed: 11/26/2022]
Abstract
The neuroprotective effect of ghrelin has recently been reported in Alzheimer's disease (AD). Ghrelin is converted from des-acyl ghrelin to the activated form, acyl ghrelin, by membrane bound o-acyltransferase 4 (MBOAT4), and then binds to growth hormone secretagogue receptor (GHS-R). We examined the levels of plasma acyl/des-acyl ghrelin in 75 AD subjects and age- and sex-matched controls, as well as the DNA methylation and mRNA expression of MBOAT4 and GHS-R in peripheral leukocytes. The acyl ghrelin concentration was significantly higher in AD subjects than in controls (2.18 ± 1.25 vs. 1.49 ± 2.3, p = 0.001). The methylation rate of MBOAT4 CpG 2 was significantly lower in AD subjects than in controls (4.0 ± 0.9 vs. 4.7 ± 1.2, p < 0.001). The mRNA expression levels of MBOAT4 and GHS-R1b were significantly higher in AD subjects than in controls (MBOAT4: 1.10 ± 0.48 vs. 1.0 ± 0.55, p = 0.049; GHS-R1b: 1.76 ± 3.18 vs. 1.0 ± 1.56, p = 0.030). These changes in the ghrelin cascade in peripheral blood may reflect those in the brain, and may be a neuroprotective biomarker in AD.
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Affiliation(s)
- Yuta Yoshino
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Yu Funahashi
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Shunsuke Nakata
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Yuki Ozaki
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Kiyohiro Yamazaki
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Taku Yoshida
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Takaaki Mori
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Yoko Mori
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Shinichiro Ochi
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
| | - Jun-Ichi Iga
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan.
| | - Shu-Ichi Ueno
- Department of Neuropsychiatry, Molecules and Function, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
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Uchida Y, Nagashima K, Yuri K. Fasting or systemic des-acyl ghrelin administration to rats facilitates thermoregulatory behavior in a cold environment. Brain Res 2018; 1696:10-21. [PMID: 29859973 DOI: 10.1016/j.brainres.2018.05.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 05/19/2018] [Accepted: 05/24/2018] [Indexed: 10/14/2022]
Abstract
Fasted rats place their tails underneath their body trunks in the cold (tail-hiding behavior), which is a thermoregulatory behavior. The aim of the present study was to investigate the effect of fasting and des-acyl ghrelin, a hormone related to fasting, on tail-hiding behavior and neural activity in the cold. Wistar rats were divided into 'fed', '42-h fasting' and des-acyl ghrelin groups. The rats received an intraperitoneal saline or 30-μg des-acyl ghrelin injection, and were then exposed to 27 °C or 15 °C for 2-h with continuous body temperature (Tb), tail skin temperature (Ttail), and tail-hiding behavior measurements. cFos immunoreactive (cFos-IR) cells in the insula, secondary somatosensory cortex, medial preoptic nucleus, parastrial nucleus, amygdala, and lateral parabrachial nucleus were counted in four segments: seg1, 2, 3, and 4 (bregma -0.36, -1.44, -2.64, and -9.00 mm), respectively. At 15 °C, Tb and Ttail were lower in the 42-h fasting group than in the fed and des-acyl ghrelin groups, and the duration of tail-hiding behavior was longer in the 42-h fasting and des-acyl ghrelin groups than in the fed group. The onset of tail-hiding behavior more advanced in the des-acyl ghrelin group than in the fed group at 15 °C. Only at the insula in seg3 at 15 °C, the number of cFos-IR cells was greater in the 42-h fasting group than in the fed group. Both the 42-h fasting and des-acyl ghrelin groups might modulate the tail-hiding behavior of rats in a cold, and a part of the insula might be involved this response during fasting.
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Affiliation(s)
- Yuki Uchida
- Department of Neurobiology and Anatomy, Kochi Medical School, Kochi University, Kochi, Japan.
| | - Kei Nagashima
- Laboratory of Integrative Physiology (Body Temperature and Fluid Laboratory), Faculty of Human Sciences, Japan; Institute of Applied Brain Sciences, Waseda University, Saitama, Japan
| | - Kazunari Yuri
- Department of Neurobiology and Anatomy, Kochi Medical School, Kochi University, Kochi, Japan
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6
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Marchiò M, Roli L, Giordano C, Trenti T, Guerra A, Biagini G. Decreased ghrelin and des-acyl ghrelin plasma levels in patients affected by pharmacoresistant epilepsy and maintained on the ketogenic diet. Clin Nutr 2018; 38:954-957. [PMID: 29605572 DOI: 10.1016/j.clnu.2018.03.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 02/06/2018] [Accepted: 03/11/2018] [Indexed: 12/19/2022]
Abstract
BACKGROUND & AIMS The gastric hormones ghrelin and des-acyl ghrelin have been found to be altered in patients treated with antiepileptic drugs. However, it is unknown if these hormones could be modified by other antiepileptic treatments, such as the ketogenic diet. Especially, a reduction in ghrelin levels could be relevant in view of the growth retardation observed under ketogenic diet treatment. For this reason we aimed to determine the changes in ghrelin and des-acyl ghrelin plasma levels in children affected by refractory epilepsy and treated with the ketogenic diet up to 90 days. METHODS Both peptides were measured by immunoassays in plasma obtained from 16 children. RESULTS Ghrelin plasma levels were progressively reduced by the ketogenic diet, reaching a minimum corresponding to 42% of basal levels after 90 days of ketogenic diet (P < 0.05, Duncan's test). Des-acyl ghrelin plasma levels were similarly affected, reaching minimal levels at 30 days (65% of basal levels), and maintaining a significant reduction until 90 days after the onset of ketogenic diet (P < 0.01 for both time intervals). No significant changes in growth were observed during the monitored period of ketogenic diet administration. CONCLUSIONS Ghrelin and des-acyl ghrelin are downregulated by the ketogenic diet in children affected by refractory epilepsy. Although no significant changes in growth were observed during the short time period of our investigation, the reduction in ghrelin availability may explain the reported growth retardation found in children treated with the ketogenic diet in the long-term.
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Affiliation(s)
- Maddalena Marchiò
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy; Pediatric Neurology, Polyclinic Hospital, Modena, Italy
| | - Laura Roli
- Department of Laboratory Medicine and Pathological Anatomy, AUSL Modena, Modena, Italy
| | - Carmela Giordano
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Tommaso Trenti
- Department of Laboratory Medicine and Pathological Anatomy, AUSL Modena, Modena, Italy
| | | | - Giuseppe Biagini
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy; Center for Neuroscience and Neurotechnology, University of Modena and Reggio Emilia, Modena, Italy.
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Abstract
Ghrelin and motilin are released from gastrointestinal endocrine cells during hunger, to act through G protein-coupled receptors that have closely related amino acid sequences. The actions of ghrelin are more complex than motilin because ghrelin also exists outside the GI tract, it is processed to des-acyl ghrelin which has activity, ghrelin can exist in truncated forms and retain activity, the ghrelin receptor can have constitutive activity and is subject to biased agonism and finally additional ghrelin-like and des-acyl ghrelin receptors are proposed. Both ghrelin and motilin can stimulate gastric emptying, acting via different pathways, perhaps influenced by biased agonism at the receptors, but research is revealing additional pathways of activity. For example, it is becoming apparent that reduction of nausea may be a key therapeutic target for ghrelin receptor agonists and perhaps for compounds that modulate the constitutive activity of the ghrelin receptor. Reduction of nausea may be the mechanism through which gastroparesis symptoms are reduced. Intriguingly, a potential ability of motilin to influence nausea is also becoming apparent. Ghrelin interacts with digestive function through its effects on appetite, and ghrelin antagonists may have a place in treating Prader-Willi syndrome. Unlike motilin, ghrelin receptor agonists also have the potential to treat constipation by acting at the lumbosacral defecation centres. In conclusion, agonists of both ghrelin and motilin receptors hold potential as treatments for specific subsets of digestive system disorders.
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Au CC, Docanto MM, Zahid H, Raffaelli FM, Ferrero RL, Furness JB, Brown KA. Des-acyl ghrelin inhibits the capacity of macrophages to stimulate the expression of aromatase in breast adipose stromal cells. J Steroid Biochem Mol Biol 2017; 170:49-53. [PMID: 27423512 DOI: 10.1016/j.jsbmb.2016.07.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 07/11/2016] [Accepted: 07/12/2016] [Indexed: 11/18/2022]
Abstract
Des-acyl ghrelin is the unacylated form of the well-characterized appetite-stimulating hormone ghrelin. It affects a number of physiological processes, including increasing adipose lipid accumulation and inhibiting adipose tissue inflammation. Breast adipose tissue inflammation in obesity is associated with an increase in the expression of the estrogen biosynthetic enzyme, aromatase, and is hypothesized to create a hormonal milieu conducive to tumor growth. We previously reported that des-acyl ghrelin inhibits the expression and activity of aromatase in isolated human adipose stromal cells (ASCs), the main site of aromatase expression in the adipose tissue. The current study aimed to examine the effect of des-acyl ghrelin on the capacity of mouse macrophages (RAW264.7 cells) and human adipose tissue macrophages (ATMs) to stimulate aromatase expression in primary human breast ASCs. RAW264.7 cells were treated with 0, 10 and 100pM des-acyl ghrelin following activation with phorbol 12-myristate 13-acetate, and cells and conditioned media were collected after 6 and 24h. The effect of des-acyl ghrelin on macrophage polarization was examined by assessing mRNA expression of pro-inflammatory M1-specific marker Cd11c and anti-inflammatory M2-specific marker Cd206, as well as expression of Tnf and Ptgs2, known mediators of the macrophage-dependent stimulation of aromatase. TNF protein in conditioned media was assessed by ELISA. The effect of RAW264.7 and ATM-conditioned media on aromatase expression in ASCs was assessed after 6h. Results demonstrate des-acyl ghrelin significantly increases the expression of Cd206 and suppresses the expression of Cd11c, Tnf and Ptgs2 in activated RAW264.7 cells. Treatment of RAW264.7 and ATMs with des-acyl ghrelin also significantly reduces the capacity of these cells to stimulate aromatase transcript expression in human breast ASCs. Overall, these findings suggest that in addition to direct effects on aromatase in ASCs, des-acyl ghrelin also has the capacity to inhibit the macrophage-dependent induction of aromatase, and provides a novel mechanism for potential effects of des-acyl ghrelin to break the linkage between obesity and breast cancer.
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Affiliation(s)
- CheukMan C Au
- Metabolism and Cancer Laboratory, Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, VIC, Australia.
| | - Maria M Docanto
- Metabolism and Cancer Laboratory, Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, VIC, Australia.
| | - Heba Zahid
- Metabolism and Cancer Laboratory, Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, VIC, Australia; Faculty of Applied Medical Science, Taibah University, Medina, Saudi Arabia.
| | - Francesca-Maria Raffaelli
- Metabolism and Cancer Laboratory, Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, VIC, Australia; Molecular Cell Physiology and Endocrinology, Institute for Zoology, Technische Universität Dresden, Dresden, Germany.
| | - Richard L Ferrero
- Gastrointestinal Infection and Inflammation, Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, VIC, Australia; Department of Microbiology, Monash University, Clayton, VIC, Australia.
| | - John B Furness
- Department of Anatomy & Neuroscience, University of Melbourne, Parkville, Victoria 3010, Australia.
| | - Kristy A Brown
- Metabolism and Cancer Laboratory, Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, VIC, Australia; Department of Physiology, Monash University, Clayton, VIC, Australia.
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Nonaka M, Kurebayashi N, Murayama T, Sugihara M, Terawaki K, Shiraishi S, Miyano K, Hosoda H, Kishida S, Kangawa K, Sakurai T, Uezono Y. Therapeutic potential of ghrelin and des-acyl ghrelin against chemotherapy-induced cardiotoxicity. Endocr J 2017; 64:S35-S39. [PMID: 28652542 DOI: 10.1507/endocrj.64.s35] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Cancer was considered an incurable disease for many years; however, with the development of anticancer drugs and state-of-the art technologies, it has become curable. Cardiovascular diseases in patients with cancer or induced by cancer chemotherapy have recently become a great concern. Certain anticancer drugs and molecular targeted therapies cause cardiotoxicity, which limit the widespread implementation of cancer treatment and decrease the quality of life in cancer patients significantly. The anthracycline doxorubicin (DOX) causes cardiotoxicity. The cellular mechanism underlying DOX-induced cardiotoxicity include free-radical damage to cardiac myocytes, leading to mitochondrial injury and subsequent death of myocytes. Recently, circulating orexigenic hormones, ghrelin and des-acyl ghrelin, have been reported to inhibit DOX-induced cardiotoxicity. However, little is known about the molecular mechanisms underlying their preventive effects. In the present study, we show the possible mechanisms underlying the effects of ghrelin and des-acyl ghrelin against DOX-induced cardiotoxicity through in vitro and in vivo researches.
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Affiliation(s)
- Miki Nonaka
- Division of Cancer Pathophysiology, National Cancer Center Research Institute, Tokyo 104-0045, Japan
| | - Nagomi Kurebayashi
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Takashi Murayama
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Masami Sugihara
- Department of Clinical Laboratory Medicine, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Kiyoshi Terawaki
- Division of Cancer Pathophysiology, National Cancer Center Research Institute, Tokyo 104-0045, Japan
- Tsumura Kampo Research Laboratories, Kampo Research & Development Division, Tsumura & Co., Ibaraki 300-1192, Japan
| | - Seiji Shiraishi
- Division of Cancer Pathophysiology, National Cancer Center Research Institute, Tokyo 104-0045, Japan
| | - Kanako Miyano
- Division of Cancer Pathophysiology, National Cancer Center Research Institute, Tokyo 104-0045, Japan
| | - Hiroshi Hosoda
- Department of Regenerative Medicine and Tissue Engineering, National Cerebral and Cardiovascular Center Research Institute, Suita 565-8565, Japan
| | - Shosei Kishida
- Department of Biochemistry and Genetics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima 890-8544, Japan
| | - Kenji Kangawa
- National Cerebral and Cardiovascular Center Research Institute, Suita 565-8565, Japan
| | - Takashi Sakurai
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Yasuhito Uezono
- Division of Cancer Pathophysiology, National Cancer Center Research Institute, Tokyo 104-0045, Japan
- Division of Supportive Care Research, National Cancer Center, Exploratory Oncology Research & Clinical Trial Center, Tokyo 104-0045, Japan
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González-Domínguez MI, Lazo-de-la-Vega-Monroy ML, Zaina S, Sabanero M, Daza-Benítez L, Malacara JM, Barbosa-Sabanero G. Association of cord blood des-acyl ghrelin with birth weight, and placental GHS-R1 receptor expression in SGA, AGA, and LGA newborns. Endocrine 2016; 53:182-91. [PMID: 26754660 DOI: 10.1007/s12020-015-0833-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 12/14/2015] [Indexed: 11/29/2022]
Abstract
Although ghrelin in cord blood has been associated to birth weight, its role in fetal and postnatal growth has not been elucidated. The aim of this study was to analyze total ghrelin, acyl ghrelin (AG), and des-acyl ghrelin (DAG) in cord blood of newborns with idiopathic birth weight alterations, and to evaluate protein expression of placental GHS-R1, in order to investigate their correlation with birth weight and placental weight. We performed a cross-sectional comparative study in umbilical cord blood and placentas from healthy mothers of SGA, AGA, and LGA (small, adequate and large for gestational age) term newborns (n = 20 per group). Cord blood total ghrelin, AG, and DAG were measured by ELISA, and placental GHS-R1 expression was evaluated by Western blot. Cord blood DAG was higher in SGA compared to AGA newborns (902.1 ± 109.1 and 597.4 ± 58.2 pg/ml, respectively, p = 0.01) while LGA and AGA showed similar values (627.2 ± 76.4 pg/ml for LGA, p = 0.80). DAG negatively correlated with birthweight (r = -0.31, p = 0.02) and placental weight (r = -0.33, p = 0.02). No differences in AG or total ghrelin were found. GHS-R1 protein in placenta was not differentially expressed among SGA, AGA, and LGA. Our results suggest a role of DAG in intrauterine growth. Further studies are needed in order to elucidate the mechanisms by which DAG participates in fetal growth.
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Affiliation(s)
- Martha I González-Domínguez
- Medical Sciences Department, Health Sciences Division, University of Guanajuato, Leon Campus. 20 de Enero No. 929 Col. Obregon, 37320, Leon, Guanajuato, Mexico
| | - Maria-Luisa Lazo-de-la-Vega-Monroy
- Medical Sciences Department, Health Sciences Division, University of Guanajuato, Leon Campus. 20 de Enero No. 929 Col. Obregon, 37320, Leon, Guanajuato, Mexico
| | - Silvio Zaina
- Medical Sciences Department, Health Sciences Division, University of Guanajuato, Leon Campus. 20 de Enero No. 929 Col. Obregon, 37320, Leon, Guanajuato, Mexico
| | - Myrna Sabanero
- Biology Department, Natural and Exact Sciences Division, University of Guanajuato, Guanajuato Campus, Guanajuato, Mexico
| | | | - Juan Manuel Malacara
- Medical Sciences Department, Health Sciences Division, University of Guanajuato, Leon Campus. 20 de Enero No. 929 Col. Obregon, 37320, Leon, Guanajuato, Mexico
| | - Gloria Barbosa-Sabanero
- Medical Sciences Department, Health Sciences Division, University of Guanajuato, Leon Campus. 20 de Enero No. 929 Col. Obregon, 37320, Leon, Guanajuato, Mexico.
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11
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Inoue Y, Hayashi Y, Kangawa K, Suzuki Y, Murakami N, Nakahara K. Des-acyl ghrelin prevents heatstroke-like symptoms in rats exposed to high temperature and high humidity. Neurosci Lett 2016; 615:28-32. [PMID: 26773867 DOI: 10.1016/j.neulet.2016.01.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 12/24/2015] [Accepted: 01/05/2016] [Indexed: 10/22/2022]
Abstract
We have shown previously that des-acyl ghrelin decreases body temperature in rats through activation of the parasympathetic nervous system. Here we investigated whether des-acyl ghrelin ameliorates heatstroke in rats exposed to high temperature. Peripheral administration of des-acyl ghrelin significantly attenuated hyperthermia induced by exposure to high-temperature (35°C) together with high humidity (70-80%). Although biochemical analysis revealed that exposure to high temperature significantly increased hematocrit and the serum levels of aspartate amino transferase (AST), alanine transaminase (ALT), blood urea nitrogen (BUN), creatinine and electrolytes (Na(+), K(+), Cl(-)), most of these heatstroke-associated reactions were significantly reduced by treatment with des-acyl ghrelin. The level of des-acyl ghrelin in plasma was also found to be significantly increased under high-temperature conditions. These results suggest that des-acyl ghrelin could be useful for preventing heatstroke under high temperature condition.
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Affiliation(s)
- Yoshiyuki Inoue
- Department of Veterinary Physiology, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Yujiro Hayashi
- Asubio Pharma Co., Ltd., 6-4-3 Minatojima-Minamimachi, Chuo-ku, Kobe 650-0047, Japan
| | - Kenji Kangawa
- Department of Biochemistry, National Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan
| | - Yoshihiro Suzuki
- Laboratory of Animal Health Science, School of Veterinary Medicine, Kitasato University, Aomori 034-8628, Japan
| | - Noboru Murakami
- Department of Veterinary Physiology, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Keiko Nakahara
- Department of Veterinary Physiology, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan.
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12
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Portelli J, Coppens J, Demuyser T, Smolders I. Des-acyl ghrelin attenuates pilocarpine-induced limbic seizures via the ghrelin receptor and not the orexin pathway. Neuropeptides 2015; 51:1-7. [PMID: 26002375 DOI: 10.1016/j.npep.2015.04.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 03/02/2015] [Accepted: 04/16/2015] [Indexed: 01/27/2023]
Abstract
Des-acyl ghrelin, widely accepted to work independently of the ghrelin receptor, is increasingly being implicated in a number of biological functions. The involvement of des-acyl ghrelin in epilepsy has only been recently reported. In this study, apart from unravelling the effect of des-acyl ghrelin on seizure thresholds and seizure severity in two models of pilocarpine-induced seizures, we mainly attempted to unravel its anticonvulsant mechanism of action. Since it was found that des-acyl ghrelin administration affected food intake via the orexin pathway, we first determined whether this pathway was responsible for des-acyl ghrelin's seizure-attenuating properties using the dual orexin receptor antagonist almorexant. We noted that, while des-acyl ghrelin showed dose-dependent anticonvulsant effects against focal pilocarpine-evoked seizures in rats, almorexant did not affect seizure severity and did not reverse des-acyl ghrelin's anticonvulsant effect. Subsequently, to investigate whether the ghrelin receptor was implicated in des-acyl ghrelin's anticonvulsant properties, we tested this peptide in ghrelin receptor deficient mice and wild type mice, all infused with pilocarpine intravenously. Unexpectedly, we found that des-acyl ghrelin significantly elevated seizure thresholds in C57Bl/6 and wild type mice but not in ghrelin receptor knock-out mice. Taken together, our results indicate the involvement of the ghrelin receptor in the anticonvulsant effects of des-acyl ghrelin on pilocarpine-induced seizures. We also show for the first time that dual antagonism of hippocampal orexin receptors does not affect seizure severity.
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Affiliation(s)
- Jeanelle Portelli
- Center for Neurosciences, Department of Pharmaceutical Chemistry, Drug Analysis and Drug Information, Vrije Universiteit Brussel, Laarbeeklaan 103, Brussels 1090, Belgium; Department of Neurology, UZ Gent, De Pintelaan 185, Ghent 9000, Belgium
| | - Jessica Coppens
- Center for Neurosciences, Department of Pharmaceutical Chemistry, Drug Analysis and Drug Information, Vrije Universiteit Brussel, Laarbeeklaan 103, Brussels 1090, Belgium
| | - Thomas Demuyser
- Center for Neurosciences, Department of Pharmaceutical Chemistry, Drug Analysis and Drug Information, Vrije Universiteit Brussel, Laarbeeklaan 103, Brussels 1090, Belgium
| | - Ilse Smolders
- Center for Neurosciences, Department of Pharmaceutical Chemistry, Drug Analysis and Drug Information, Vrije Universiteit Brussel, Laarbeeklaan 103, Brussels 1090, Belgium.
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13
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Rocha-Sousa A, Pereira-Silva P, Tavares-Silva M, Azevedo-Pinto S, Rodrigues-Araújo J, Pinho S, Avelino A, Falcão-Reis F, Leite-Moreira A. Identification of the ghrelin-GHSR 1 system and its influence in the modulation of induced ocular hypertension in rabbit and rat eyes. Peptides 2014; 57:59-66. [PMID: 24780389 DOI: 10.1016/j.peptides.2014.04.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 04/18/2014] [Accepted: 04/18/2014] [Indexed: 11/23/2022]
Abstract
Recent studies evidenced a decrease in ghrelin's aqueous humor levels in patients with glaucoma. The goal of our investigation was to study the effect of the ghrelin-GHSR-1a system in the modulation of intraocular pressure in acute ocular hypertension models and its expression and distribution in ocular tissues. Two animal models of acute ocular hypertension were used to study the effect of the ghrelin-GHSR-1a system in the modulation of intraocular pressure: the rabbit and the rat. Ocular hypertension was induced by an intravitreal injection of 20% NaCl. Ghrelin or des-acyl ghrelin were delivered subconjunctivally and the intraocular pressure was assessed by a rebound tonometer that was calibrated for each species. In addition, we have studied the influence of nitric oxide and prostaglandins on ghrelin's effect in the rabbit animal model. Finally, we determined by immunofluorescence the expression of ghrelin and GHSR-1 in the rat's ocular tissue. Ghrelin decreased the intraocular pressure in both animal models (maximum decrease: 43.8±12.0% in the rabbit and 29.0±7.46% in the rat). In the rabbit, this effect was blunted in the presence of l-NAME and ketorolac. Des-acyl ghrelin only decreased the intraocular pressure in the rat (maximum decrease: 34.9±8.15%). Ghrelin expression was detected in the ciliary processes and GHSR-1 expression was detected in the trabecular meshwork and ciliary body. The ghrelin-GHSR-1 system is expressed in the anterior segment of the eye. Ghrelin and des-acyl ghrelin are responsible for a hypotensive effect in acute ocular hypertension animal models.
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Affiliation(s)
- A Rocha-Sousa
- Department of Sense Organs, Faculty of Medicine, University of Porto, Porto, Portugal; Department of Ophthalmology, São João Hospital, Porto, Portugal.
| | - P Pereira-Silva
- Department of Physiology and Cardiothoracic Surgery, Faculty of Medicine, University of Porto, Porto, Portugal
| | - M Tavares-Silva
- Department of Physiology and Cardiothoracic Surgery, Faculty of Medicine, University of Porto, Porto, Portugal
| | - S Azevedo-Pinto
- Department of Physiology and Cardiothoracic Surgery, Faculty of Medicine, University of Porto, Porto, Portugal
| | | | - S Pinho
- Department of Physiology and Cardiothoracic Surgery, Faculty of Medicine, University of Porto, Porto, Portugal
| | - A Avelino
- Department of Experimental Biology, Faculty of Medicine, University of Porto, Porto, Portugal; IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Portugal
| | - F Falcão-Reis
- Department of Sense Organs, Faculty of Medicine, University of Porto, Porto, Portugal; Department of Ophthalmology, São João Hospital, Porto, Portugal
| | - A Leite-Moreira
- Department of Physiology and Cardiothoracic Surgery, Faculty of Medicine, University of Porto, Porto, Portugal
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Abstract
Ghrelin is a peptide found in the mucosal layer of the rat stomach that exhibits growth hormone-releasing and appetite-stimulating activities. Since the discovery of ghrelin in chicken in 2002, information on its structure, distribution, function, and receptors has been accumulated, mainly in poultry. Here, we summarize the following findings since 2008 in birds: (1) central ghrelin acts as an anorexigenic neuropeptide, but the effect of peripheral ghrelin differs depending on the chicken strain and light conditions the birds are kept in; (2) central ghrelin inhibits not only food intake but also water drinking, and it may be mediated by urocortin, a member of the corticotropin-releasing factor family; (3) peripheral ghrelin acts as an anti-lipogenic factor in broiler chickens but not in rats; (4) the enzyme involved in ghrelin acylation (ghrelin-O-acyltransferase [GOAT]) has been identified in chickens; (5) dietary lipids are used for ghrelin acylation; (6) des-acyl ghrelin administered alone or with ghrelin does not affect feeding behavior; (7) the existence and physiological function of obestatin must now be carefully examined in birds; (8) other than the growth hormone secretagogue receptors (GHS) R1a and 1b, GHS-R variants not found in mammals have been found in chicken and Japanese quail; and finally (9) little is known about the involvement of the ghrelin system in wild birds and in avian-specific behavior such as brooding and migration.
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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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Fujimiya M, Asakawa A, Ataka K, Kato I, Inui A. Different effects of ghrelin, des-acyl ghrelin and obestatin on gastroduodenal motility in conscious rats. World J Gastroenterol 2008; 14:6318-26. [PMID: 19009646 PMCID: PMC2766112 DOI: 10.3748/wjg.14.6318] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Three peptides, ghrelin, des-acyl ghrelin and obestatin are derived from a common prohormone, preproghrelin by posttranslational processing, originating from endocrine cells in the stomach. To examine the effects of these peptides, we applied the manometric measurement of gastrointestinal motility in freely moving conscious rat models. Ghrelin exerts stimulatory effects on the motility of antrum and duodenum in both fed and fasted state of animals. Des-acyl ghrelin exerts inhibitory effects on the motility of antrum, but not on the motility of duodenum in the fasted state of animals. Obestatin exerts inhibitory effects on the motility of antrum and duodenum in the fed state, but not in the fasted state of animals. NPY Y2 or Y4 receptors in the brain may mediate the action of ghrelin, CRF type 2 receptors in the brain mediate the action of des-acyl ghrelin, whereas CRF type 1 and type 2 receptors in the brain mediate the action of obestatin. Vagal afferent pathways might be involved in the action of ghrelin, but not involved in the action of des-acyl ghrelin, whereas vagal afferent pathways might be partially involved in the action of obestatin.
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