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Cavalu S, Saber S, Hamad RS, Abdel-Reheim MA, Elmorsy EA, Youssef ME. Orexins in apoptosis: a dual regulatory role. Front Cell Neurosci 2024; 18:1336145. [PMID: 38699177 PMCID: PMC11064656 DOI: 10.3389/fncel.2024.1336145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 04/03/2024] [Indexed: 05/05/2024] Open
Abstract
The orexins, also referred to as hypocretins, are neuropeptides that originate from the lateral hypothalamus (LH) region of the brain. They are composed of two small peptides, orexin-A, and orexin-B, which are broadly distributed throughout the central and peripheral nervous systems. Orexins are recognized to regulate diverse functions, involving energy homeostasis, the sleep-wake cycle, stress responses, and reward-seeking behaviors. Additionally, it is suggested that orexin-A deficiency is linked to sleepiness and narcolepsy. The orexins bind to their respective receptors, the orexin receptor type 1 (OX1R) and type 2 (OX2R), and activate different signaling pathways, which results in the mediation of various physiological functions. Orexin receptors are widely expressed in different parts of the body, including the skin, muscles, lungs, and bone marrow. The expression levels of orexins and their receptors play a crucial role in apoptosis, which makes them a potential target for clinical treatment of various disorders. This article delves into the significance of orexins and orexin receptors in the process of apoptosis, highlighting their expression levels and their potential contributions to different diseases. The article offers an overview of the existing understanding of the orexin/receptor system and how it influences the regulation of apoptosis.
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Affiliation(s)
- Simona Cavalu
- Faculty of Medicine and Pharmacy, University of Oradea, Oradea, Romania
| | - Sameh Saber
- Department of Pharmacology, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Rabab S. Hamad
- Biological Sciences Department, College of Science, King Faisal University, Al Ahsa, Saudi Arabia
- Central Laboratory, Theodor Bilharz Research Institute, Giza, Egypt
| | - Mustafa Ahmed Abdel-Reheim
- Department of Pharmaceutical Sciences, College of Pharmacy, Shaqra University, Shaqra, Saudi Arabia
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni Suef, Egypt
| | - Elsayed A. Elmorsy
- Department of Pharmacology and Therapeutics, College of Medicine, Qassim University, Buraidah, Saudi Arabia
- Department of Clinical Pharmacology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Mahmoud E. Youssef
- Department of Pharmacology, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
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Squillacioti C, Pelagalli A, Assisi L, Costagliola A, Van Nassauw L, Mirabella N, Liguori G. Does Orexin B-Binding Receptor 2 for Orexins Regulate Testicular and Epididymal Functions in Normal and Cryptorchid Dogs? Front Vet Sci 2022; 9:880022. [PMID: 35903144 PMCID: PMC9323089 DOI: 10.3389/fvets.2022.880022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Accepted: 06/21/2022] [Indexed: 11/15/2022] Open
Abstract
Orexins A (OXA) and B (OXB) and the receptors 1 (OX1R) and 2 (OX2R) for orexins are hypothalamic peptides found in several mammalian organs and participated to the control of a wide assortment of physiological and pathological functions. The distribution of OXA and OX1R has been extensively studied in the male gonad of mammals. Here, we examined the expression and localization of OXB and OX2R as well as their possible involvement in the regulation of testicular and epididymal functions, in healthy and cryptorchid dogs, employing some techniques such as immunohistochemistry, Western blotting, and real-time RT-PCR. In vitro tests were also carried out for evaluating the steroidogenic effect of OXB. OXB and OX2R were expressed in spermatocytes, spermatids, and Leydig cells in normal testis. Their localization was restricted to Sertoli and Leydig cells in cryptorchid conditions. OXB was found to be localized in all tracts of both normal and cryptorchid epididymis, whereas OX2R was found only in the caput. Because the small molecular weight of the peptides OXA and OXB, the expression of their precursor prepro-orexin (PPO), OX1R, and OX2R proteins and mRNAs were investigated by means of Western blot and real-time RT-PCR analyses, respectively, in all tested groups of. In particular, the mRNA level expression of all three genes was higher in cryptorchid dogs than in normal ones. In vitro tests demonstrated that OXB—by binding OX2R—is not involved in testicular steroidogenic processes. Therefore, the findings of this study might be the basis for further functional and molecular studies addressing the possible biochemical effects of OXB and OX2R in normal and pathological conditions of the male reproductive system.
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Affiliation(s)
- Caterina Squillacioti
- Laboratory of Anatomy, Department of Veterinary Medicine and Animal Productions, University of Napoli Federico II, Naples, Italy
| | - Alessandra Pelagalli
- Department of Advanced Biomedical Sciences, University of Napoli Federico II, Naples, Italy
- Institute of Biostructures and Bioimages (IBB), National Research Council (CNR), Naples, Italy
- *Correspondence: Alessandra Pelagalli
| | - Loredana Assisi
- Department of Biology, University of Napoli Federico II, Naples, Italy
| | - Anna Costagliola
- Laboratory of Anatomy, Department of Veterinary Medicine and Animal Productions, University of Napoli Federico II, Naples, Italy
| | - Luc Van Nassauw
- Laboratory of Human Anatomy and Embryology, Department ASTARC, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Nicola Mirabella
- Laboratory of Anatomy, Department of Veterinary Medicine and Animal Productions, University of Napoli Federico II, Naples, Italy
| | - Giovanna Liguori
- Laboratory of Anatomy, Department of Veterinary Medicine and Animal Productions, University of Napoli Federico II, Naples, Italy
- Department of Prevention, ASL FG, Foggia, Italy
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New Aspects of Corpus Luteum Regulation in Physiological and Pathological Conditions: Involvement of Adipokines and Neuropeptides. Cells 2022; 11:cells11060957. [PMID: 35326408 PMCID: PMC8946127 DOI: 10.3390/cells11060957] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 02/28/2022] [Accepted: 03/08/2022] [Indexed: 11/17/2022] Open
Abstract
The corpus luteum is a small gland of great importance because its proper functioning determines not only the appropriate course of the estrous/menstrual cycle and embryo implantation, but also the subsequent maintenance of pregnancy. Among the well-known regulators of luteal tissue functions, increasing attention is focused on the role of neuropeptides and adipose tissue hormones—adipokines. Growing evidence points to the expression of these factors in the corpus luteum of women and different animal species, and their involvement in corpus luteum formation, endocrine function, angiogenesis, cells proliferation, apoptosis, and finally, regression. In the present review, we summarize the current knowledge about the expression and role of adipokines, such as adiponectin, leptin, apelin, vaspin, visfatin, chemerin, and neuropeptides like ghrelin, orexins, kisspeptin, and phoenixin in the physiological regulation of the corpus luteum function, as well as their potential involvement in pathologies affecting the luteal cells that disrupt the estrous cycle.
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Coleman P, de Lecea L, Gotter A, Hagan J, Hoyer D, Kilduff T, Kukkonen JP, Porter R, Renger J, Siegel JM, Sutcliffe G, Upton N, Winrow CJ. Orexin receptors in GtoPdb v.2021.3. IUPHAR/BPS GUIDE TO PHARMACOLOGY CITE 2021; 2021. [PMID: 34927075 DOI: 10.2218/gtopdb/f51/2021.3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Orexin receptors (nomenclature as agreed by the NC-IUPHAR Subcommittee on Orexin receptors [42]) are activated by the endogenous polypeptides orexin-A and orexin-B (also known as hypocretin-1 and -2; 33 and 28 aa) derived from a common precursor, preproorexin or orexin precursor, by proteolytic cleavage and some typical peptide modifications [109]. Currently the only orexin receptor ligands in clinical use are suvorexant and lemborexant, which are used as hypnotics. Orexin receptor crystal structures have been solved [134, 133, 54, 117, 46].
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Dobrzyn K, Kiezun M, Szeszko K, Kisielewska K, Rytelewska E, Gudelska M, Zaobidna E, Bors K, Kopij G, Szymanska K, Kaminska B, Kaminski T, Smolinska N. Orexin B affects the transcriptome of incubated in vitro porcine endometrial explants from the early-implantation period. Reprod Domest Anim 2020; 56:239-253. [PMID: 32402144 DOI: 10.1111/rda.13700] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 04/23/2020] [Accepted: 05/05/2020] [Indexed: 01/11/2023]
Abstract
This study determined the effect of orexin B (OXB) on the porcine endometrial transcriptome during the embryo attachment phase. Microarray analyses of gene ontology (GO), biological pathways, networks and differentially expressed genes (DEG) were performed. Orexin B influenced the expression of 887 genes (fold change > 1.2; p < .05): 620 genes were up-regulated, and 267 were down-regulated. The analysis of the relationship between DEG revealed that OXB interacts with genes linked with processes such as cell hormone binding, regulation of hormone levels, lipid transport, steroid metabolic processes, the apoptotic signalling pathway and the acute inflammatory response, which are pivotal for reproductive success. Orexin B played a bivalent role in the early-pregnant uterus by limiting the pregnancy outcome, promoting embryo development, suppressing the immune system and, consequently, preventing embryo rejection. These findings suggest that OXB could be responsible for the proper course of gestation by adapting litter size to the metabolic status of the maternal organism.
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Affiliation(s)
- Kamil Dobrzyn
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Marta Kiezun
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Karol Szeszko
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Katarzyna Kisielewska
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Edyta Rytelewska
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Marlena Gudelska
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Ewa Zaobidna
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Kinga Bors
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Grzegorz Kopij
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Karolina Szymanska
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Barbara Kaminska
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Tadeusz Kaminski
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Nina Smolinska
- Department of Animal Anatomy and Physiology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
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Hu S, Niu J, Zhang R, Li X, Luo M, Sang T, Guo J, Liu J, Ding X, Li X, Ma Y, Gao R. Orexin A associates with inflammation by interacting with OX1R/OX2R receptor and activating prepro-Orexin in cancer tissues of gastric cancer patients. GASTROENTEROLOGIA Y HEPATOLOGIA 2020; 43:240-247. [PMID: 31983458 DOI: 10.1016/j.gastrohep.2019.10.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 10/05/2019] [Accepted: 10/25/2019] [Indexed: 02/07/2023]
Abstract
OBJECTIVE Gastric cancer (GC) has been become the second leading cause for cancer-associated death. This study aimed to investigate Orexin A levels and associated receptors in tumor tissues of GC patients. PATIENTS AND METHODS Forty-six consecutive gastric cancer patients (GC, n=46) and 13 chronic atrophic gastritis patients (CAG, n=13) were recruited. Meanwhile, 18 health individuals visiting Medical Examination Department were involved as control (N group, n=18). ELISA was used to examine Orexin A concentration. Immunohistochemistry assay was used to examine OX1R and OX2R. HE staining was applied to evaluate inflammation. qRT-PCR was employed to detect OX1R, OX2R, prepro-Orexin mRNAs. Serum Helicobacter pylori (H. pylori) infection was measured. RESULTS Orexin A expression in GC patients was significantly up-regulated compared to N group and CAG group (p<0.05). Orexin A expression was increased in CAG group compared to N group (p<0.05). Gastric cancer tissues exhibited significantly obvious inflammation compared to N group and CAG group (p<0.05). OX1R and OX2R expressions were significantly down-regulated in GC group compared to N group and CAG group (p<0.05). OX1R and OX2R were lower significantly in GC group compared to CAG group (p<0.05). Prepro-Orexin was significantly depleted in tumor tissues of GC group compared to N group and CAG group (p<0.05). Orexin A expression was un-associated with gender, age and differential grades (p>0.05). CAG and GC patients demonstrated higher H. pylori infection rates. CONCLUSION Orexin A was associated with inflammation by interacting with OX1R/OX2R receptor and activating prepro-Orexin in tumor tissues of gastric cancer patients.
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Affiliation(s)
- Shengjuan Hu
- Digestive division, Endoscopic center, People's Hospital of Ningxia Hui Autunomous Region, Yinchuan, China.
| | - Jianguo Niu
- Ningxia Key Laboratory of Cerebrocranial Diseases, Ningxia Medical University, Yinchuan, China
| | - Rong Zhang
- 521 Hospital of Norinco Group, Xi'an, China
| | - Ximei Li
- Digestive division, Endoscopic center, People's Hospital of Ningxia Hui Autunomous Region, Yinchuan, China
| | - Ming Luo
- Digestive division, Endoscopic center, People's Hospital of Ningxia Hui Autunomous Region, Yinchuan, China
| | - Tian Sang
- Digestive division, Endoscopic center, People's Hospital of Ningxia Hui Autunomous Region, Yinchuan, China
| | - Jianyang Guo
- Digestive division, Endoscopic center, People's Hospital of Ningxia Hui Autunomous Region, Yinchuan, China
| | - Jun Liu
- Digestive division, Endoscopic center, People's Hospital of Ningxia Hui Autunomous Region, Yinchuan, China
| | - Xiaoling Ding
- Digestive division, Endoscopic center, People's Hospital of Ningxia Hui Autunomous Region, Yinchuan, China
| | - Xuemei Li
- Digestive division, Endoscopic center, People's Hospital of Ningxia Hui Autunomous Region, Yinchuan, China
| | - Yuhong Ma
- Digestive division, Endoscopic center, People's Hospital of Ningxia Hui Autunomous Region, Yinchuan, China
| | - Ruiping Gao
- Digestive division, Endoscopic center, People's Hospital of Ningxia Hui Autunomous Region, Yinchuan, China
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Orexin-A exacerbates Alzheimer's disease by inducing mitochondrial impairment. Neurosci Lett 2020; 718:134741. [PMID: 31927055 DOI: 10.1016/j.neulet.2020.134741] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 12/11/2019] [Accepted: 01/03/2020] [Indexed: 12/13/2022]
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disease which is characterized by the accumulation of amyloid-β peptide (Aβ). Orexin-A is a neuropeptide which has been reported to participate in the pathogenesis of AD. Thus, we aimed to investigate the possible mechanism by which Orexin-A acts in AD. APP/PS1 transgenic mice, an animal model of AD, were intracerebroventricularly injected with Orexin-A. Aβ-treated SH-SY5Y cells were used as a cell model of AD and treated with Orexin-A. The Morris water maze test, fluorescence microscopy, enzyme-linked immunosorbent assay (ELISA), electron microscopy, real-time PCR, and other biochemical assays were conducted. The Morris water maze test showed that Orexin-A aggravated cognitive deficit in APP/PS1 mice. Using thioflavine-S staining and ELISA, we found that Orexin-A promoted Aβ accumulation in APP/PS1 mice. By evaluating mitochondrial morphology, cytochrome c oxidase activity, ATP level, mitochondrial DNA copy number, and reactive oxygen species, we found that Orexin-A aggravated mitochondrial impairment in APP/PS1 mice and Aβ-treated SH-SY5Y cells. Our results indicate that Orexin-A exacerbates AD by inducing mitochondrial impairment. This is a new mechanism that explains how Orexin-A participates in the pathogenesis of AD.
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Intra-accumbal orexin-1 receptor inhibition prevents the anxiolytic-like effect of ethanol and leads to increases in orexin-A content and receptor expression. Pharmacol Biochem Behav 2019; 185:172761. [DOI: 10.1016/j.pbb.2019.172761] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 08/14/2019] [Accepted: 08/15/2019] [Indexed: 12/23/2022]
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Wang CM, Yang CQ, Cheng BH, Chen J, Bai B. Orexin-A protects SH-SY5Y cells against H 2O 2-induced oxidative damage via the PI3K/MEK 1/2/ERK 1/2 signaling pathway. Int J Immunopathol Pharmacol 2018; 32:2058738418785739. [PMID: 29983082 PMCID: PMC6073832 DOI: 10.1177/2058738418785739] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Orexin-A elicits multiple potent effects on a variety of tumor cells via
different signaling pathways. However, it is unknown whether it has a
neuroprotective effect on SH-SY5Y human neuroblastoma cells. This study
investigated the neuroprotective effect of Orexin-A against hydrogen peroxide
(H2O2)-induced oxidative damage in SH-SY5Y cells and
the underlying mechanism. H2O2 treatment decreased the
viability of SH-SY5Y cells, induced apoptosis, and decreased superoxide
dismutase activity. Orexin-A attenuated these effects, indicating that it
protects SH-SY5Y cells against H2O2-induced oxidative
damage. Pre-treatment with Orexin-A also attenuated
H2O2-induced increases in phosphorylation of
MEK1/2 and ERK1/2. Moreover, these effects of Orexin-A
were reduced in the presence of the PI3K inhibitor LY294002. Finally,
pre-treatment with LY294002 abrogated attenuation of the
H2O2-induced decrease in cell viability and increase
in caspase-3/7 activity by Orexin-A. These results show that the
PI3K/MEK1/2/ERK1/2 signaling pathway is involved in
the neuroprotective effects of Orexin-A against
H2O2-induced oxidative damage in SH-SY5Y cells. Our
findings provide insight into the neuroprotective effects of Orexin-A and the
underlying mechanism, which will be useful for the treatment of nervous system
diseases.
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Affiliation(s)
- Chun-Mei Wang
- 1 Neurobiology Key Laboratory of Jining Medical University in Colleges of Shandong, Jining, P.R. China
| | - Chun-Qing Yang
- 1 Neurobiology Key Laboratory of Jining Medical University in Colleges of Shandong, Jining, P.R. China
| | - Bao-Hua Cheng
- 1 Neurobiology Key Laboratory of Jining Medical University in Colleges of Shandong, Jining, P.R. China
| | - Jing Chen
- 1 Neurobiology Key Laboratory of Jining Medical University in Colleges of Shandong, Jining, P.R. China.,2 Division of Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry, UK
| | - Bo Bai
- 1 Neurobiology Key Laboratory of Jining Medical University in Colleges of Shandong, Jining, P.R. China
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Rinne MK, Leino TO, Turku A, Turunen PM, Steynen Y, Xhaard H, Wallén EA, Kukkonen JP. Pharmacological characterization of the orexin/hypocretin receptor agonist Nag 26. Eur J Pharmacol 2018; 837:137-144. [DOI: 10.1016/j.ejphar.2018.09.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 08/31/2018] [Accepted: 09/04/2018] [Indexed: 12/22/2022]
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Basini G, Ciccimarra R, Bussolati S, Grolli S, Ragionieri L, Ravanetti F, Botti M, Gazza F, Cacchioli A, Di Lecce R, Cantoni AM, Grasselli F. Orexin A in swine corpus luteum. Domest Anim Endocrinol 2018; 64:38-48. [PMID: 29733985 DOI: 10.1016/j.domaniend.2018.04.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 03/23/2018] [Accepted: 04/02/2018] [Indexed: 11/27/2022]
Abstract
Orexin A (OXA) is a hypothalamic neuropeptide which acts on 2 known G-protein-coupled receptors. It has been demonstrated that OXA is a central molecular link between food intake and reproduction. More recently, its peripheral role has been investigated, and we demonstrated its involvement in regulating ovarian follicle function. The present study was undertaken to explore a potential physiological role of orexin system in swine corpus luteum, a transient ovarian endocrine organ. Our aim was, first, to analyze the localization and eventual colocalization of OXA and its 2 receptors within the different cell types composing the corpus luteum structure. Second, we wanted to explore the effects of OXA on isolated luteal cells, and finally to verify a potential involvement of OXA in angiogenesis, a crucial event in corpus luteum development. Our data demonstrate the local expression of OXA and its receptors in swine corpus luteum. Luteal cell functions were affected by treatment with OXA. In particular, progesterone production was inhibited (P < 0.05) and nonenzymatic scavenging activity was increased (P < 0.05). Moreover, OXA inhibited (P < 0.05) new vessel growth. Our results suggest that OXA could act locally to play a role in corpus luteum demise.
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Affiliation(s)
- G Basini
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy.
| | - R Ciccimarra
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
| | - S Bussolati
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
| | - S Grolli
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
| | - L Ragionieri
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
| | - F Ravanetti
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
| | - M Botti
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
| | - F Gazza
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
| | - A Cacchioli
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
| | - R Di Lecce
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
| | - A M Cantoni
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
| | - F Grasselli
- Dipartimento di Scienze Medico-Veterinarie, Università di Parma, Via del Taglio 10, 43126, Parma, Italy
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12
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Joshi D, Sarkar D, Singh SK. The hypothalamic neuropeptide orexin A- a possible regulator in glucose homeostasis and germ cell kinetics in adult mice testes. Biochimie 2018; 152:94-109. [PMID: 29964087 DOI: 10.1016/j.biochi.2018.06.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Accepted: 06/26/2018] [Indexed: 12/20/2022]
Abstract
Orexin A (OXA), a hypothalamic neuropeptide, regulates food intake, sleep-wake cycle and energy balance by binding to its receptor (OX1R). Apart from brain, OXA and OX1R are also present in peripheral organs including reproductive tissues. Mammalian reproduction depends on uptake and proper utilization of glucose in the testes. This study, therefore, examined role of OXA/OX1R system in regulation of glucose homeostasis in adult mouse testis under in vivo and ex vivo conditions. Binding of OXA to OX1R was blocked using an OX1R antagonist, SB-334867. Mice were given a single bilateral intratesticular injection of the antagonist at doses of 4 and 12μg/mouse and sacrificed 24 h post-injection. In order to understand the direct role of OXA in testes of adult mice, an ex vivo experiment was performed where binding of OXA to OX1R in the testis was blocked by using the same OX1R antagonist. The antagonist treatment affected testicular glucose and lactate concentration with concomitant down-regulation in the expression of glucose transporters 3 and 8. A decreased activity in lactate dehydrogenase enzyme and imbalance between germ cell survival and proliferation were also noted in testes in treated mice. The results of ex vivo study supported the results obtained from in vivo study. The findings thus suggest involvement of OXA/OX1R system in regulation of testicular glucose homeostasis and germ cell kinetics in adult mice.
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Affiliation(s)
- Deepanshu Joshi
- Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Debarshi Sarkar
- Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Shio Kumar Singh
- Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
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13
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Tsuneki H, Wada T, Sasaoka T. Chronopathophysiological implications of orexin in sleep disturbances and lifestyle-related disorders. Pharmacol Ther 2018; 186:25-44. [DOI: 10.1016/j.pharmthera.2017.12.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Ragionieri L, Ravanetti F, Di Lecce R, Botti M, Ciccimarra R, Bussolati S, Basini G, Gazza F, Cacchioli A. Immunolocalization of Orexin A and its receptors in the different structures of the porcine ovary. Ann Anat 2018; 218:214-226. [PMID: 29738835 DOI: 10.1016/j.aanat.2018.04.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 04/05/2018] [Accepted: 04/19/2018] [Indexed: 10/17/2022]
Abstract
Orexins are neuropeptides with pleiotropic functions, involved in the coordination of multiple versatile physiological processes, in particular related to food intake and several aspects of the reproductive process. Their actions are carried out through the bond with the related Orexin 1 (OXR1) and Orexin 2 (OXR2) G-protein-coupled receptors. Studies on the expression of the orexinergic system in the female genital organs are scarce and limited to preovulatory gametogenic follicles and corpora lutea isolated from the rest of the ovary. As the description of only these structures is insufficient to provide a complete picture of the organ, the present study is aimed to give a panoramic view of all the ovarian structures and cells expressing Orexin A (OXA) and its receptors in their original localization. Double labeling immunofluorescent methods, applied on frozen sections of the whole organ in both follicular and luteal phase, were used to highlight the particular distribution and colocalization of the proteins. For a better recognition of cellular morphology and a better distinction between gametogenic (healthy) and atretic follicles, also a single labeling immunolocalization of OXA on formalin fixed paraffin embedded tissues and a TUNEL staining were performed. The results indicate that OXA and its two receptors subtypes are expressed in all the different structures composing the swine ovary, albeit in different ways, in both phases of the ovarian cycle. In general, OXA and OXR2 appear diffusely distributed within "health", proliferating and steroid producing cells, while has granular appearance, being presumably associated to cytoplasmic vesicles, in degenerating cells, independently if apoptotic or not. The immunoreactivity for OXR1, instead, is often associated with the nuclear envelope but it is also detectable, to a lesser extent, diffusely distributed in the cytoplasm of growing or steroid producing cells. When cells undertake the path leading to degeneration, also OXR1 immunoreactivity assumes a granular appearance in the cytoplasm and is colocalized with OXA and OXR2. Different roles for the two receptors in the same cell and a different regulation of their expression remain to be investigated. Their comprehension could help studies of follicle development in pig, as part of in vitro oocyte maturation and fertilization programs in livestock.
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Affiliation(s)
- Luisa Ragionieri
- Dept. of Veterinary Science, University of Parma, Via del Taglio 10, Parma 43126, Italy.
| | - Francesca Ravanetti
- Dept. of Veterinary Science, University of Parma, Via del Taglio 10, Parma 43126, Italy
| | - Rosanna Di Lecce
- Dept. of Veterinary Science, University of Parma, Via del Taglio 10, Parma 43126, Italy
| | - Maddalena Botti
- Dept. of Veterinary Science, University of Parma, Via del Taglio 10, Parma 43126, Italy
| | - Robert Ciccimarra
- Dept. of Veterinary Science, University of Parma, Via del Taglio 10, Parma 43126, Italy
| | - Simona Bussolati
- Dept. of Veterinary Science, University of Parma, Via del Taglio 10, Parma 43126, Italy
| | - Giuseppina Basini
- Dept. of Veterinary Science, University of Parma, Via del Taglio 10, Parma 43126, Italy
| | - Ferdinando Gazza
- Dept. of Veterinary Science, University of Parma, Via del Taglio 10, Parma 43126, Italy
| | - Antonio Cacchioli
- Dept. of Veterinary Science, University of Parma, Via del Taglio 10, Parma 43126, Italy
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Pruszynska-Oszmalek E, Kolodziejski PA, Kaczmarek P, Sassek M, Szczepankiewicz D, Mikula R, Nowak KW. Orexin A but not orexin B regulates lipid metabolism and leptin secretion in isolated porcine adipocytes. Domest Anim Endocrinol 2018; 63:59-68. [PMID: 29413903 DOI: 10.1016/j.domaniend.2017.12.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Revised: 11/29/2017] [Accepted: 12/29/2017] [Indexed: 01/10/2023]
Abstract
It is well known that orexins are involved in the metabolism and endocrine function of rodent adipocytes, but there are no data on other animal species, including pigs. Therefore, in this study, we tested the hypothesis that orexin A (OxA) and orexin B (OxB) modulate the metabolism and endocrine functions of isolated porcine adipocytes and adipose tissue explants. Moreover, we characterized the possible mechanism of OxA action in porcine adipocytes. According to the results, both orexin receptor 1 and orexin receptor 2 were expressed in the porcine adipose tissue. We found that OxA suppressed the release of glycerol from porcine adipocytes both in the absence (basal lipolysis; P < 0.05) and in the presence (stimulated lipolysis; P < 0.05) of isoproterenol. Orexin A increased basal and insulin-stimulated glucose uptake (P < 0.05), as well as it enhanced the rate of glucose incorporation into lipids with insulin (stimulated lipogenesis; P < 0.01) or without insulin (basal; P < 0.05). We have also shown that OxA stimulated the mRNA expression of glucose transporter 4 (P < 0.05) and its translocation into the plasma membrane (P < 0.01). Moreover, OxA upregulated the mRNA expression of leptin in isolated porcine adipocytes (P < 0.05) and increased the secretion of leptin (P < 0.05). We have also demonstrated one of the possible mechanisms of OxA action in adipocytes. In the presence of extracellular-signal-regulated kinase 1 and 2 (ERK1/2) inhibitor, the effect of OxA was not detectable in porcine adipocytes, which indicates that this peptide increased cell viability via ERK1/2 pathway (P < 0.05). However, OxB did not show any effect on the metabolism and endocrine functions of porcine adipocytes. In summary, we have shown for the first time that OxA has a significant impact on the intensity of lipolysis, glucose uptake, lipogenesis, as well as on the expression and secretion of leptin. Therefore, we conclude that OxA but not OxB regulates lipid metabolism in porcine adipose tissue and that this regulation is partly mediated via ERK1/2 pathway. The action of orexins should be further explored to better understand their role in the regulation of adiposity in pigs.
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Affiliation(s)
- E Pruszynska-Oszmalek
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland.
| | - P A Kolodziejski
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland
| | - P Kaczmarek
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland
| | - M Sassek
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland
| | - D Szczepankiewicz
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland
| | - R Mikula
- Department of Animal Nutrition and Feed Management, Poznan University of Life Sciences, Wołynska Street 33, 60-637 Poznan, Poland
| | - K W Nowak
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wołynska Street 35, 60-637 Poznan, Poland
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16
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Liguori G, Squillacioti C, Assisi L, Pelagalli A, Vittoria A, Costagliola A, Mirabella N. Potential role of orexin A binding the receptor 1 for orexins in normal and cryptorchid dogs. BMC Vet Res 2018; 14:55. [PMID: 29482574 PMCID: PMC5828418 DOI: 10.1186/s12917-018-1375-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 02/15/2018] [Indexed: 01/17/2023] Open
Abstract
Background Cryptorchidism is one of the most common birth disorders of the male reproductive system identified in dogs and other mammals. This condition is characterised by the absence of one (unilateral) or both (bilateral) gonads from the scrotum. The peptides orexin A (OxA) and B (OxB) were obtained by post-transcriptional proteolytic cleavage of a precursor molecule, called prepro-orexin. These substances bind two types of G-coupled receptors called receptor 1 (OX1R) and 2 (OX2R) for orexins. OX1R is specific to OxA while OX2R binds the two peptides with equal affinity. Orexins modulate a great variety of body functions, such as the reproductive mechanism. The purpose of the present research was to study the presence of OxA and its receptor 1 and their possible involvement in the canine testis under healthy and pathological conditions. Methods This study was performed using adult male normal dogs and male dogs affected by unilateral cryptorchidism. Tissue samples were collected from testes and were divided into three groups: normal, contralateral and cryptic. The samples were used for immunohistochemistry, Western blot and in vitro tests for testosterone evaluation in normal and pathological conditions. Results OxA-immunoreactivity (IR) was described in interstitial Leydig cells of the normal gonad, and Leydig, Sertoli cells and gonocytes in the cryptic gonad. In the normal testis, OX1R-IR was described in Leydig cells, in pachytene and second spermatocytes and in immature and mature spermatids throughout the stages of the germ developing cycle of the male gonad. In the cryptic testis OX1R-IR was distributed in Leydig and Sertoli cells. The presence of prepro-orexin and OX1R was demonstrated by Western blot analysis. The incubation of fresh testis slices with OxA caused the stimulation of testosterone synthesis in the normal and cryptic gonad while the steroidogenic OxA-induced effect was cancelled by adding the selective OX1R antagonist SB-408124. Conclusions These results led us to hypothesise that OxA binding OX1R might be involved in the modulation of spermatogenesis and steroidogenesis in canine testis in healthy and pathological conditions.
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Affiliation(s)
- Giovanna Liguori
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137, Naples, Italy.
| | - Caterina Squillacioti
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137, Naples, Italy
| | - Loredana Assisi
- Department of Biology, University of Naples "Federico II", Via Mezzocannone 6, 80134, Naples, Italy
| | - Alessandra Pelagalli
- Department of Advanced Biomedical Sciences, University of Naples "Federico II", Via Pansini 5, 80131, Naples, Italy.,Institute of Biostructures and Bioimages, National Research Council, Via De Amicis 95, 80131, Naples, Italy
| | - Alfredo Vittoria
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137, Naples, Italy
| | - Anna Costagliola
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137, Naples, Italy
| | - Nicola Mirabella
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137, Naples, Italy
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17
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Global analysis of gene expression mediated by OX1 orexin receptor signaling in a hypothalamic cell line. PLoS One 2017; 12:e0188082. [PMID: 29145494 PMCID: PMC5690679 DOI: 10.1371/journal.pone.0188082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Accepted: 10/31/2017] [Indexed: 01/23/2023] Open
Abstract
The orexins and their cognate G-protein coupled receptors have been widely studied due to their associations with various behaviors and cellular processes. However, the detailed downstream signaling cascades that mediate these effects are not completely understood. We report the generation of a neuronal model cell line that stably expresses the OX1 orexin receptor (OX1) and an RNA-Seq analysis of changes in gene expression seen upon receptor activation. Upon treatment with orexin, several families of related transcription factors are transcriptionally regulated, including the early growth response genes (Egr), the Kruppel-like factors (Klf), and the Nr4a subgroup of nuclear hormone receptors. Furthermore, some of the transcriptional effects observed have also been seen in data from in vivo sleep deprivation microarray studies, supporting the physiological relevance of the data set. Additionally, inhibition of one of the most highly regulated genes, serum and glucocorticoid-regulated kinase 1 (Sgk1), resulted in the diminished orexin-dependent induction of a subset of genes. These results provide new insight into the molecular signaling events that occur during OX1 signaling and support a role for orexin signaling in the stimulation of wakefulness during sleep deprivation studies.
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18
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Wan X, Liu Y, Zhao Y, Sun X, Fan D, Guo L. Orexin A affects HepG2 human hepatocellular carcinoma cells glucose metabolism via HIF-1α-dependent and -independent mechanism. PLoS One 2017; 12:e0184213. [PMID: 28886081 PMCID: PMC5590901 DOI: 10.1371/journal.pone.0184213] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Accepted: 08/21/2017] [Indexed: 01/20/2023] Open
Abstract
Orexins are hypothalamic neuropeptides that regulate feeding, reward, wakefulness and energy homeostasis. The present study sought to characterize the involvement of orexin A in glucose metabolism in HepG2 human hepatocellular carcinoma cells, and investigated the role of hypoxia-inducible factor-1α (HIF-1α) in the response. HepG2 cells were exposed to different concentrations of orexin A (10−9 to 10−7 M) in vitro, without or with the orexin receptor 1 (OX1R) inhibitor (SB334867), HIF-1α inhibitor (YC-1) or a combination of both inhibitors. Subsequently, OX1R, HIF-1α expression and localization, glucose uptake, glucose transporter 1 (GLUT1) expression and ATP content were measured. We further investigated the intracellular fate of glucose by measuring the gene expression of pyruvate dehydrogenase kinase 1 (PDK1), lactate dehydrogenase (LDHA) and pyruvate dehydrogenase B (PDHB), as well as metabolite levels including lactate generation and mitochondrial pyruvate dehydrogenase (PDH) activity. The activity of phosphoinositide 3-kinase (PI3K)/Akt/mammalian target of rapamycin (mTOR) pathway was also assessed. Our results showed that the expression of OX1R was predominantly located in the nucleus in HepG2 cells. Orexin A oxygen-independently promoted the mRNA and protein expression of HIF-1α as well as its nuclear accumulation in HepG2 cells and the elevated HIF-1α protein was associated, at least partly, with the activation of the PI3K/Akt/mTOR pathway. Orexin A stimulated GLUT1 expression, glucose uptake as well as ATP generation in HepG2 cells via OX1R acting through the HIF-1α pathway. Moreover, orexin A inhibited LDHA, PDK1 expression and lactate production, stimulated PDHB expression and PDH enzyme activity independent of HIF-1α. Our results indicated that orexin signaling facilitated the glucose flux into mitochondrial oxidative metabolism rather than glycolysis in HepG2 cells. These findings provide new insight into the regulation of glucose metabolism by orexin A in hepatocellular carcinoma cells.
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Affiliation(s)
- Xing Wan
- Department of Medical Oncology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, P.R. China
| | - Yuanyuan Liu
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, P.R. China
| | - Yuyan Zhao
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, P.R. China
- * E-mail: (LG); (YZ)
| | - Xiaoqi Sun
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, P.R. China
| | - Dongxiao Fan
- Department of Orthopedic Surgery, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, P.R. China
| | - Lei Guo
- Department of Orthopedic Surgery, First Affiliated Hospital, China Medical University, Shenyang, Liaoning, P.R. China
- * E-mail: (LG); (YZ)
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19
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Abstract
Orexin/hypocretin peptide (orexin-A and orexin-B) signaling is believed to take place via the two G-protein-coupled receptors (GPCRs), named OX1 and OX2 orexin receptors, as described in the previous chapters. Signaling of orexin peptides has been investigated in diverse endogenously orexin receptor-expressing cells - mainly neurons but also other types of cells - and in recombinant cells expressing the receptors in a heterologous manner. Findings in the different systems are partially convergent but also indicate cellular background-specific signaling. The general picture suggests an inherently high degree of diversity in orexin receptor signaling.In the current chapter, I present orexin signaling on the cellular and molecular levels. Discussion of the connection to (potential) physiological orexin responses is only brief since these are in focus of other chapters in this book. The same goes for the post-synaptic signaling mechanisms, which are dealt with in Burdakov: Postsynaptic actions of orexin. The current chapter is organized according to the tissue type, starting from the central nervous system. Finally, receptor signaling pathways are discussed across tissues, cell types, and even species.
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Affiliation(s)
- Jyrki P Kukkonen
- Biochemistry and Cell Biology, Department of Veterinary Biosciences, University of Helsinki, POB 66, FIN-00014, Helsinki, Finland.
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20
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Turku A, Rinne MK, Boije af Gennäs G, Xhaard H, Lindholm D, Kukkonen JP. Orexin receptor agonist Yan 7874 is a weak agonist of orexin/hypocretin receptors and shows orexin receptor-independent cytotoxicity. PLoS One 2017; 12:e0178526. [PMID: 28575023 PMCID: PMC5456073 DOI: 10.1371/journal.pone.0178526] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Accepted: 05/15/2017] [Indexed: 01/22/2023] Open
Abstract
Two promising lead structures of small molecular orexin receptor agonist have been reported, but without detailed analyses of the pharmacological properties. One of them, 1-(3,4-dichlorophenyl)-2-[2-imino-3-(4-methylbenzyl)-2,3-dihydro-1H-benzo[d]imidazol-1-yl]ethan-1-ol (Yan 7874), is commercially available, and we set out to analyze its properties. As test system we utilized human OX1 and OX2 orexin receptor-expressing Chinese hamster ovary (CHO) K1 cells as well as control CHO-K1 and neuro-2a neuroblastoma cells. Gq-coupling was assessed by measurement of intracellular Ca2+ and phospholipase C activity, and the coupling to Gi and Gs by adenylyl cyclase inhibition and stimulation, respectively. At concentrations above 1 μM, strong Ca2+ and low phospholipase C responses to Yan 7874 were observed in both OX1- and OX2-expressing cells. However, a major fraction of the response was not mediated by orexin receptors, as determined utilizing the non-selective orexin receptor antagonist N-biphenyl-2-yl-1-{[(1-methyl-1H-benzimidazol-2-yl)sulfanyl]acetyl}-L-prolinamide (TCS 1102) as well as control CHO-K1 cells. Yan 7874 did not produce any specific adenylyl cyclase response. Some experiments suggested an effect on cell viability by Yan 7874, and we thus analyzed this. Within a few hours of exposure, Yan 7874 markedly changed cell morphology (shrunken, rich in vacuoles), reduced growth, promoted cell detachment, and induced necrotic cell death. The effect was equal in cells expressing orexin receptors or not. Thus, Yan 7874 is a weak partial agonist of orexin receptors. It also displays strong off-target effects in the same concentration range, culminating in necrotic cell demise. This makes Yan 7874 unsuitable as orexin receptor agonist.
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Affiliation(s)
- Ainoleena Turku
- Biochemistry and Cell Biology, Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Maiju K. Rinne
- Biochemistry and Cell Biology, Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Gustav Boije af Gennäs
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Henri Xhaard
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Dan Lindholm
- Department of Biochemistry and Developmental Biology, Medicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Minerva Foundation Institute for Medical Research, Helsinki, Finland
| | - Jyrki P. Kukkonen
- Biochemistry and Cell Biology, Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
- * E-mail:
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Taximaimaiti R, Abuliken X, Maihemuti M, Abudujilile D, Abudulimu H. Elevated Expression of Ox2R in Cervical Cancers and Placentas of Uyghur Women in Xinjiang, China. Asian Pac J Cancer Prev 2016; 17:4959-4963. [PMID: 28032723 PMCID: PMC5454703 DOI: 10.22034/apjcp.2016.17.11.4959] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Objective: Cervical cancer is one of the major causes of mortality of Uyghur women in Xinjiang, China. Although increased expression of orexin receptor (OxR), known to be strongly expressed in human placenta, has a proven relation to some cancers, there have been few studies of cervical cancer. Thus, we explored this question by evaluating the expression of orexin receptor as a biomarker for screening early stage of cervical cancer in Uyghur women with highest occurrence rate of cervical cancer in China. Study Design: We used polymerase chain reaction (PCR) and immunohistochemical staining to determine the expression of both Ox1R and Ox2R in cervical cancer and cervicitis biopsies collected from Uyghur women infected with human papilloma virus (HPV)16. The expression rate was compared between cervical cancers of low, intermediate and high differentiation and cervicitis. Results: Although there was no significant difference in the expression rate of Ox1R between groups, Ox2R was significantly overexpressed in cervical cancer patients when compared to the cervicitis group. Ox1R was negative in normal human placenta while Ox2R was positive. Conclusions: While expression of Ox1R had no correlation with invasion or metastatic potential, Ox2R demonstrated elevation in cervical cancer with heterogeneity in groups with different metastatic potential, in the human placenta as well, implying that it might serve as an indicator of invasive capacity along with other indices.
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Affiliation(s)
- Reyisha Taximaimaiti
- Seven-year Clinical Medicine of Class 2, year 2011,Xinjiang Medical University, Urumqi, PR China.
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22
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Wojciechowicz T, Skrzypski M, Szczepankiewicz D, Hertig I, Kołodziejski PA, Billert M, Strowski MZ, Nowak KW. Original Research: Orexins A and B stimulate proliferation and differentiation of porcine preadipocytes. Exp Biol Med (Maywood) 2016; 241:1786-95. [PMID: 27190275 DOI: 10.1177/1535370216649261] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 04/18/2016] [Indexed: 12/17/2022] Open
Abstract
Orexin A (OXA) and B (OXB) are neuropeptides which regulate appetite, energy expenditure, and arousal via G-protein coupled receptors termed as OXR1 and OXR2. The aim of this study was to characterize the effects of OXA and OXB on proliferation and differentiation of porcine preadipocytes. Porcine preadipocytes express both OXRs. OXA and OXB enhance porcine preadipocyte proliferation by 54.8% or 63.2 %, respectively. OXA and OXB potentiate differentiation of porcine preadipocytes, as judged by the increased lipid accumulation and expression of proadipogenic genes. Cellular lipid content after exposure of preadipocytes for six days to 100 nM OXA or OXB increased by 82.2% or 59.2%, respectively. OXA and OXB suppressed glycerol release by 23.9% or 24.9% in preadipocytes differentiated for six days. OXA (100 nM) increased peroxisome proliferator-activated receptor gamma (PPARγ) expression in cells differentiated for 24 h by 100.5%. PPARγ expression was also stimulated in preadipocytes differentiated in the presence of 10 nM (58.3%) or 100 nM OXA (50.6%) for three days. OXB potentiated PPARγ mRNA expression at 1 nM (59%), 10 nM (53.2%), and 100 nM (73.9%) in cells differentiated for three days. OXA increased CCAAT/enhancer binding protein alpha expression in preadipocytes differentiated for six days by 65%. OXB stimulated CCAAT/enhancer binding protein beta expression in preadipocytes differentiated for three days at 10 nM (149.5%) as well as 100 nM (207.2%). Lipoprotein lipase mRNA expression increased in cells treated with 10 nM OXA by 152.6% and 100 nM OXA by 162%. Lipoprotein lipase expression increased by 134% at 100 nM OXB. Furthermore, OXA (100 nM) and OXB (100 nM) increased leptin mRNA expression in preadipocytes differentiated for three days by 49.9% or 71.3%, respectively. These data indicate that orexin receptors may be relevant in the context of white adipose tissue formation.
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Affiliation(s)
- Tatiana Wojciechowicz
- Department of Animal Physiology and Biochemistry, Poznań University of Life Sciences, Poznań 60-637, Poland
| | - Marek Skrzypski
- Department of Animal Physiology and Biochemistry, Poznań University of Life Sciences, Poznań 60-637, Poland
| | - Dawid Szczepankiewicz
- Department of Animal Physiology and Biochemistry, Poznań University of Life Sciences, Poznań 60-637, Poland
| | - Iwona Hertig
- Department of Animal Physiology and Biochemistry, Poznań University of Life Sciences, Poznań 60-637, Poland
| | - Paweł A Kołodziejski
- Department of Animal Physiology and Biochemistry, Poznań University of Life Sciences, Poznań 60-637, Poland
| | - Maria Billert
- Department of Animal Physiology and Biochemistry, Poznań University of Life Sciences, Poznań 60-637, Poland
| | - Mathias Z Strowski
- Department of Hepatology and Gastroenterology and Interdisciplinary Centre of Metabolism: Endocrinology, Diabetes and Metabolism, Charite-University Medicine Berlin, Berlin 13353, Germany Department of Gastroenterology, Medical Clinic, Elblandklinik, Meissen 01662, Germany
| | - Krzysztof W Nowak
- Department of Animal Physiology and Biochemistry, Poznań University of Life Sciences, Poznań 60-637, Poland
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23
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Nicole P, Couvineau P, Jamin N, Voisin T, Couvineau A. Crucial role of the orexin-B C-terminus in the induction of OX1 receptor-mediated apoptosis: analysis by alanine scanning, molecular modelling and site-directed mutagenesis. Br J Pharmacol 2015; 172:5211-23. [PMID: 26282891 PMCID: PMC4687804 DOI: 10.1111/bph.13287] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 06/12/2015] [Accepted: 08/11/2015] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND AND PURPOSE Orexins (A and B) are hypothalamic peptides that interact with OX1 and OX2 receptors and are involved in the sleep/wake cycle. We previously demonstrated that OX1 receptors are highly expressed in colon cancer tumours and colonic cancer cell lines where orexins induce apoptosis and inhibit tumour growth in preclinical animal models. The present study explored the structure-function relationships of orexin-B and OX1 receptors. EXPERIMENTAL APPROACH The contribution of all orexin-B residues in orexin-B-induced apoptosis was investigated by alanine scanning. To determine which OX1 receptor domains are involved in orexin-B binding and apoptosis, a 3D model of OX1 receptor docked to the orexin-B C-terminus (AA-20-28) was developed. Substitution of residues present in OX1 receptor transmembrane (TM) domains by site-directed mutagenesis was performed. KEY RESULTS Alanine substitution of orexin-B residues, L(11) , L(15) , A(22) , G(24) , I(25) , L(26) and M(28) , altered orexin-B's binding affinity. Substitution of these residues and of the Q(16) , A(17) , S(18) , N(20) and T(27) residues inhibited apoptosis in CHO-S-OX1 receptor cells. The K(120) , P(123) , Y(124) , N(318) , K(321) , F(340) , T(341) , H(344) and W(345) residues localized in TM2, TM3, TM6 and TM7 of OX1 receptors were shown to play a role in orexin-B recognition and orexin-B/OX1 receptor-induced apoptosis. CONCLUSIONS AND IMPLICATIONS The C-terminus of orexin-B (i) plays an important role in its pro-apoptotic effect; and (ii) interacts with some residues localized in the OX1 receptor TM. This study defines the structure-function relationship for orexin-B recognition by human OX1 receptors and orexin-B/OX1 receptor-induced apoptosis, an important step for the future development of new agonist molecules.
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Affiliation(s)
- Pascal Nicole
- Faculté de Médecine Site Bichat, INSERM U1149/Inflammation Research Center (CRI), Paris‐Diderot UniversityDHU UNITY16, rue H. Huchard75018ParisFrance
| | - Pierre Couvineau
- Faculté de Médecine Site Bichat, INSERM U1149/Inflammation Research Center (CRI), Paris‐Diderot UniversityDHU UNITY16, rue H. Huchard75018ParisFrance
| | - Nadege Jamin
- Laboratoire des Protéines et Systèmes MembranairesCEA, iBiTecS, I2BCF‐91191Gif‐sur‐Yvette CedexFrance
| | - Thierry Voisin
- Faculté de Médecine Site Bichat, INSERM U1149/Inflammation Research Center (CRI), Paris‐Diderot UniversityDHU UNITY16, rue H. Huchard75018ParisFrance
| | - Alain Couvineau
- Faculté de Médecine Site Bichat, INSERM U1149/Inflammation Research Center (CRI), Paris‐Diderot UniversityDHU UNITY16, rue H. Huchard75018ParisFrance
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Wen J, Zhao Y, Shen Y, Guo L. Effect of orexin A on apoptosis in BGC-823 gastric cancer cells via OX1R through the AKT signaling pathway. Mol Med Rep 2015; 11:3439-44. [PMID: 25586545 DOI: 10.3892/mmr.2015.3190] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2014] [Accepted: 07/22/2014] [Indexed: 01/16/2023] Open
Abstract
Orexins are a class of peptides involved in the regulation of food intake, energy homeostasis, the sleep‑wake cycle and gastrointestinal function. Recent studies have demonstrated that orexin A may influence apoptosis and proliferation in numerous types of cancer cells. However, the effect of orexin A on gastric cancer cells and its mechanisms of action remain elusive. In the present study, BGC‑823 gastric cancer cells were treated with orexin A (10‑10‑10‑6 M) in vitro and the expression levels of orexin receptor 1 (OX1R) protein in cells was then determined. The proliferation, viability and apoptosis of BGC‑823 cells were detected. In addition, BGC‑823 cells were treated with AKT inhibitor PF‑04691502 or OX1R‑specific antagonist SB334867 in combination with orexin A, in order to examine the activation of AKT and caspase‑3. The results showed that orexin A (10‑10‑10‑6 M) stimulated the OX1R protein expression in BGC‑823 cells, which improved the proliferation and viability of the cells as well as protected them from apoptosis. Phosphorylated AKT protein was significantly increased in BGC‑823 cells following treatment with orexin A. Moreover, 10‑8 M orexin A reduced the proapoptotic activity of caspase‑3 (by ≤30%). The OX1R antagonist SB334867 (10‑6 M) and AKT antagonist PF‑04691502 (10‑6 M), when used individually or in combination, abolished the effect of orexin A (10‑8 M) on BGC-823 cells. In conclusion, the results of the present study demonstrated that orexin A inhibited gastric cancer cell apoptosis via OX1R through the AKT signaling pathway.
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Affiliation(s)
- Jing Wen
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Yuyan Zhao
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Yang Shen
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Lei Guo
- Department of Orthopedic Surgery, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
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25
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Liu Y, Zhao Y, Ju S, Guo L. Orexin A upregulates the protein expression of OX1R and enhances the proliferation of SGC-7901 gastric cancer cells through the ERK signaling pathway. Int J Mol Med 2014; 35:539-45. [PMID: 25515760 DOI: 10.3892/ijmm.2014.2038] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2014] [Accepted: 11/25/2014] [Indexed: 11/06/2022] Open
Abstract
Orexins are hypothalamic peptides that regulate food intake, wakefulness, the reward system and energy metabolism. Recent studies have demonstrated the ability of orexins to promote a robust apoptosis and subsequent inhibition of cell growth in various types of cancer cells. The present study was conducted to investigate the effects of orexin A on the survival of human gastric cancer cells, SGC‑7901, and the possible mechanisms. SGC‑7901 cells were exposed to various concentrations of orexin A in vitro in the presence or absence of the orexin receptor 1 (OX1R) antagonist (SB334867), extracellular signal‑regulated kinases 1 and 2 (ERK1/2) antagonist (U0126) or a combination of the two antagonists. The amount of cell proliferation, viability and apoptosis, caspase‑8 and caspases‑9 activities, OX1R protein expression and ERK1/2 protein levels were determined. The expression of OX1R in SGC‑7901 cells was observed. Orexin A (10-10 to 10-6 M) stimulated SGC‑7901 cell proliferation and viability, reduced the pro‑apoptotic activity of caspase‑9 and protected the cells from apoptosis in a dose‑dependent manner. Additionally, ERK1/2 phosphorylation was stimulated by orexin A (10-10 to 10-6 M). However, the OX1R antagonist SB334867 (10-6 M), ERK1/2 antagonist U0126 (30 µM) or the combination of antagonists blocked the effects of orexin A to a certain extent. These results suggest that stimulation of OX1R induces the growth of SGC‑7901 gastric cancer cells through activation of ERK1/2 signaling pathway. These findings add a new dimension to the biological activities of orexin, which may have important implications in health and disease, in particular gastric cancer.
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Affiliation(s)
- Yuanyuan Liu
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Yuyan Zhao
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Shujing Ju
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Lei Guo
- Department of Orthopedic Surgery, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
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26
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Kukkonen JP, Leonard CS. Orexin/hypocretin receptor signalling cascades. Br J Pharmacol 2014; 171:314-31. [PMID: 23902572 DOI: 10.1111/bph.12324] [Citation(s) in RCA: 138] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Revised: 07/18/2013] [Accepted: 07/28/2013] [Indexed: 12/16/2022] Open
Abstract
Orexin (hypocretin) peptides and their two known G-protein-coupled receptors play essential roles in sleep-wake control and powerfully influence other systems regulating appetite/metabolism, stress and reward. Consequently, drugs that influence signalling by these receptors may provide novel therapeutic opportunities for treating sleep disorders, obesity and addiction. It is therefore critical to understand how these receptors operate, the nature of the signalling cascades they engage and their physiological targets. In this review, we evaluate what is currently known about orexin receptor signalling cascades, while a sister review (Leonard & Kukkonen, this issue) focuses on tissue-specific responses. The evidence suggests that orexin receptor signalling is multifaceted and is substantially more diverse than originally thought. Indeed, orexin receptors are able to couple to members of at least three G-protein families and possibly other proteins, through which they regulate non-selective cation channels, phospholipases, adenylyl cyclase, and protein and lipid kinases. In the central nervous system, orexin receptors produce neuroexcitation by postsynaptic depolarization via activation of non-selective cation channels, inhibition of K⁺ channels and activation of Na⁺/Ca²⁺ exchange, but they also can stimulate the release of neurotransmitters by presynaptic actions and modulate synaptic plasticity. Ca²⁺ signalling is also prominently influenced by these receptors, both via the classical phospholipase C-Ca²⁺ release pathway and via Ca²⁺ influx, mediated by several pathways. Upon longer-lasting stimulation, plastic effects are observed in some cell types, while others, especially cancer cells, are stimulated to die. Thus, orexin receptor signals appear highly tunable, depending on the milieu in which they are operating.
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Affiliation(s)
- J P Kukkonen
- Biochemistry and Cell Biology, Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
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Alexandre D, Hautot C, Mehio M, Jeandel L, Courel M, Voisin T, Couvineau A, Gobet F, Leprince J, Pfister C, Anouar Y, Chartrel N. The orexin type 1 receptor is overexpressed in advanced prostate cancer with a neuroendocrine differentiation, and mediates apoptosis. Eur J Cancer 2014; 50:2126-33. [PMID: 24910418 DOI: 10.1016/j.ejca.2014.05.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Revised: 04/10/2014] [Accepted: 05/09/2014] [Indexed: 02/05/2023]
Abstract
AIM In the present study, we have examined the presence of orexins and their receptors in prostate cancer (CaP) and investigated their effects on the apoptosis of prostate cancer cells. METHODS We have localised the orexin type 1 and 2 receptors (OX1R and OX2R) and orexin A (OxA) in CaP sections of various grades and we have quantified tumour cells containing OX1R. Expression of OX1R was evaluated in the androgeno-dependent (AD) LNCaP and the androgeno-independent (AI) DU145 prostate cancer cells submitted or not to a neuroendocrine differentiation. The effects of orexins on the apoptosis and viability of DU145 cells were also investigated. RESULTS OX1R is strongly expressed in carcinomatous foci exhibiting a neuroendocrine differentiation, and the number of OX1R-stained cancer cells increases with the grade of the CaP. In contrast, OX2R is only detected in scattered malignant cells in high grade CaP. OX1R is expressed in the AI DU145 cells but is undetectable in the LNCaP cells. Acquisition of a neuroendocrine phenotype by the DU145 cells is associated with an overexpression of OX1R. Orexins induce the apoptosis of DU145 cells submitted to a neuroendocrine differentiation. CONCLUSION The present data indicate that OX1R-driven apoptosis is overexpressed in AI CaP exhibiting a neuroendocrine differentiation opening a gate for novel therapies for these aggressive cancers which are incurable until now.
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Affiliation(s)
- David Alexandre
- INSERM U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Biomedical Research and Innovation Institute (IRIB), University of Rouen, Mont-Saint-Aignan, France
| | - Coralie Hautot
- INSERM U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Biomedical Research and Innovation Institute (IRIB), University of Rouen, Mont-Saint-Aignan, France
| | - Marwa Mehio
- INSERM U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Biomedical Research and Innovation Institute (IRIB), University of Rouen, Mont-Saint-Aignan, France
| | - Lydie Jeandel
- INSERM U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Biomedical Research and Innovation Institute (IRIB), University of Rouen, Mont-Saint-Aignan, France
| | - Maïté Courel
- INSERM U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Biomedical Research and Innovation Institute (IRIB), University of Rouen, Mont-Saint-Aignan, France
| | - Thierry Voisin
- University Paris-Diderot, Sorbonne Paris Cité, CRB3, Centre de Recherche Biomédicale Bichat Beaujon (CRB3), UMR773, INSERM, F-75018 Paris, France
| | - Alain Couvineau
- University Paris-Diderot, Sorbonne Paris Cité, CRB3, Centre de Recherche Biomédicale Bichat Beaujon (CRB3), UMR773, INSERM, F-75018 Paris, France
| | - Françoise Gobet
- Department of Pathology, University Hospital of Rouen, Institute for Biomedical Research, University of Rouen, Rouen, France
| | - Jérôme Leprince
- INSERM U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Biomedical Research and Innovation Institute (IRIB), University of Rouen, Mont-Saint-Aignan, France
| | - Christian Pfister
- Department of Urology, University Hospital of Rouen, Institute for Biomedical Research, University of Rouen, Rouen, France
| | - Youssef Anouar
- INSERM U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Biomedical Research and Innovation Institute (IRIB), University of Rouen, Mont-Saint-Aignan, France
| | - Nicolas Chartrel
- INSERM U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Biomedical Research and Innovation Institute (IRIB), University of Rouen, Mont-Saint-Aignan, France.
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Leonard CS, Kukkonen JP. Orexin/hypocretin receptor signalling: a functional perspective. Br J Pharmacol 2014; 171:294-313. [PMID: 23848055 PMCID: PMC3904253 DOI: 10.1111/bph.12296] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 06/17/2013] [Accepted: 07/03/2013] [Indexed: 10/26/2022] Open
Abstract
Multiple homeostatic systems are regulated by orexin (hypocretin) peptides and their two known GPCRs. Activation of orexin receptors promotes waking and is essential for expression of normal sleep and waking behaviour, with the sleep disorder narcolepsy resulting from the absence of orexin signalling. Orexin receptors also influence systems regulating appetite/metabolism, stress and reward, and are found in several peripheral tissues. Nevertheless, much remains unknown about the signalling pathways and targets engaged by native receptors. In this review, we integrate knowledge about the orexin receptor signalling capabilities obtained from studies in expression systems and various native cell types (as presented in Kukkonen and Leonard, this issue of British Journal of Pharmacology) with knowledge of orexin signalling in different tissues. The tissues reviewed include the CNS, the gastrointestinal tract, the pituitary gland, pancreas, adrenal gland, adipose tissue and the male reproductive system. We also summarize the findings in different native and recombinant cell lines, especially focusing on the different cascades in CHO cells, which is the most investigated cell line. This reveals that while a substantial gap exists between what is known about orexin receptor signalling and effectors in recombinant systems and native systems, mounting evidence suggests that orexin receptor signalling is more diverse than originally thought. Moreover, rather than being restricted to orexin receptor 'overexpressing' cells, this signalling diversity may be utilized by native receptors in a site-specific manner.
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Affiliation(s)
- C S Leonard
- Department of Physiology, New York Medical College, Valhalla, NY, USA
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29
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Xu TR, Yang Y, Ward R, Gao L, Liu Y. Orexin receptors: Multi-functional therapeutic targets for sleeping disorders, eating disorders, drug addiction, cancers and other physiological disorders. Cell Signal 2013; 25:2413-23. [DOI: 10.1016/j.cellsig.2013.07.025] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2013] [Accepted: 07/26/2013] [Indexed: 12/29/2022]
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30
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Dehan P, Canon C, Trooskens G, Rehli M, Munaut C, Van Criekinge W, Delvenne P. Expression of type 2 orexin receptor in human endometrium and its epigenetic silencing in endometrial cancer. J Clin Endocrinol Metab 2013; 98:1549-57. [PMID: 23482607 DOI: 10.1210/jc.2012-3263] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
CONTEXT Orexins A and B are neuropeptides that bind and activate 2 types of receptors. In addition to direct action in the brain, the orexinergic system has broader implications in peripheral organs, and it has been proposed to have a role in the induction of apoptosis. There are very few data on the endometrium. OBJECTIVE The expression and epigenetic regulation of type 2 orexin receptor (OX2R) was investigated in the human endometrium as well as in endometrial endometrioid carcinoma (EEC). METHODS OX2R localization was studied by immunohistochemistry in normal endometrium (n = 24) and in EEC (n = 32). The DNA methylation status of a CpG island located in the first exon of OX2R was analyzed by bisulfite sequencing in normal (n = 18), EEC (n = 34), and 3 endometrial cell lines. On the latter, mRNA expression and Western blotting as well as in vitro induction with orexin were performed. RESULTS Expression of the OX2R protein was detected in normal endometrial epithelia, whereas it was frequently lacking in EEC. This loss was associated with hypermethylation of OX2R in EEC in comparison with normal endometrium (median CpG methylation percentages of 48.85% and 5.85%, respectively). In cell lines, hypermethylation correlated with weak OX2R expression. Additionally, in vitro treatment of the 3 EEC cell lines with orexins A and B did not result in proliferation change CONCLUSIONS Altogether our data provide evidence for the epigenetic silencing of OX2R in EEC. The implication of the OX2R loss in tumoral progression remains to be elucidated.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- Carcinoma, Endometrioid/genetics
- Carcinoma, Endometrioid/metabolism
- Carcinoma, Endometrioid/pathology
- Case-Control Studies
- Cell Line, Tumor
- Endometrial Neoplasms/genetics
- Endometrial Neoplasms/metabolism
- Endometrial Neoplasms/pathology
- Endometrium/metabolism
- Endometrium/pathology
- Epigenesis, Genetic/physiology
- Female
- Gene Expression
- Gene Expression Regulation, Neoplastic
- Gene Silencing/physiology
- Humans
- Middle Aged
- Orexin Receptors
- Receptors, G-Protein-Coupled/genetics
- Receptors, G-Protein-Coupled/metabolism
- Receptors, Neuropeptide/genetics
- Receptors, Neuropeptide/metabolism
- Validation Studies as Topic
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Affiliation(s)
- P Dehan
- Department of Experimental Pathology, University of Liège, Tour de Pathologie (B23 + 4), Boulevard de l'Hôpital 1, B 4000 Liege Belgium.
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31
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Chen L, Zhao Y, Zheng D, Ju S, Shen Y, Guo L. Orexin A Affects INS-1 Rat Insulinoma Cell Proliferation via Orexin Receptor 1 and the AKT Signaling Pathway. Int J Endocrinol 2013; 2013:854623. [PMID: 24382962 PMCID: PMC3871501 DOI: 10.1155/2013/854623] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2013] [Revised: 10/10/2013] [Accepted: 11/10/2013] [Indexed: 01/15/2023] Open
Abstract
Our aim is to investigate the role of the AKT/PKB (protein kinase B) signaling pathway acting via orexin receptor 1 (OX1R) and the effects of orexin A (OXA) on cell proliferation in the insulin-secreting beta-cell line (INS-1 cells). Rat INS-1 cells were exposed to different concentrations of OXA in vitro and treated with OX1R antagonist (SB334867), PI3K antagonist (wortmannin), AKT antagonist (PF-04691502), or negative control. INS-1 amount of cell proliferation, viability and apoptosis, insulin secretion, OX1R protein expression, caspase-3 activity, and AKT protein levels were determined. We report that OXA (10(-10) to 10(-6) M) stimulates INS-1 cell proliferation and viability, reduces the proapoptotic activity of caspase-3 to protect against apoptotic cell death, and increases insulin secretion. Additionally, AKT phosphorylation was stimulated by OXA (10(-10) to 10(-6) M). However, the OX1R antagonist SB334867 (10(-6) M), the PI3K antagonist wortmannin (10(-8) M), the AKT antagonist PF-04691502 (10(-6) M), or the combination of both abolished the effects of OXA to a certain extent. These results suggest that the upregulation of OXA-OX1R mediated by AKT activation may inhibit cell apoptosis and promote cell proliferation in INS-1 cells. This finding provides functional evidence of the biological actions of OXA in rat insulinoma cells.
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Affiliation(s)
- Li Chen
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, China
| | - Yuyan Zhao
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, China
- *Yuyan Zhao:
| | - Delu Zheng
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, China
| | - Shujing Ju
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, China
| | - Yang Shen
- Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, China
| | - Lei Guo
- Department of Orthopedic Surgery, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, China
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Kukkonen JP. Physiology of the orexinergic/hypocretinergic system: a revisit in 2012. Am J Physiol Cell Physiol 2012; 304:C2-32. [PMID: 23034387 DOI: 10.1152/ajpcell.00227.2012] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The neuropeptides orexins and their G protein-coupled receptors, OX(1) and OX(2), were discovered in 1998, and since then, their role has been investigated in many functions mediated by the central nervous system, including sleep and wakefulness, appetite/metabolism, stress response, reward/addiction, and analgesia. Orexins also have peripheral actions of less clear physiological significance still. Cellular responses to the orexin receptor activity are highly diverse. The receptors couple to at least three families of heterotrimeric G proteins and other proteins that ultimately regulate entities such as phospholipases and kinases, which impact on neuronal excitation, synaptic plasticity, and cell death. This article is a 10-year update of my previous review on the physiology of the orexinergic/hypocretinergic system. I seek to provide a comprehensive update of orexin physiology that spans from the molecular players in orexin receptor signaling to the systemic responses yet emphasizing the cellular physiological aspects of this system.
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Affiliation(s)
- Jyrki P Kukkonen
- Dept. of Veterinary Biosciences, University of Helsinki, Finland.
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33
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Laburthe M, Voisin T. The orexin receptor OX(1)R in colon cancer: a promising therapeutic target and a new paradigm in G protein-coupled receptor signalling through ITIMs. Br J Pharmacol 2012; 165:1678-1687. [PMID: 21627633 DOI: 10.1111/j.1476-5381.2011.01510.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
An exciting aspect of the heptahelical orexin receptor 1 (OX(1)R) has emerged recently, when it was shown that it drives apoptosis in human colon cancer cell lines. Here we review recent findings related to the role of OX(1)R in colorectal cancers and the unexpected mechanism whereby this G protein-coupled receptor works. The OX(1)R is aberrantly expressed at all steps of primary colorectal tumour progression and after local (lymph node) or distant (liver, lung) metastasis. No OX(1)R is detected in normal colonic epithelial cells. Treatment of human colon cancer cells in culture with orexins promotes robust apoptosis and subsequent reduction of growth including in cells that are resistant to 5-fluorouracil, the most commonly used drug in chemotherapy. When human colon cancer cells are xenografted in nude mice, treatment with orexins dramatically slows tumour growth and even reverses the development of established tumours. Thus, OX(1)R agonists might be novel candidates for colon cancer therapy. Activation of OX(1)R drives apoptosis through G(q) protein but independently of classical Gα(q) activation of phospholipase C. In fact, it is the freed βγ dimer of G(q) that plays a pivotal role by stimulating Src-tyrosine kinase. This results in phosphorylation of two immunoreceptor tyrosine-based inhibitory motifs (ITIM) in OX(1)R and subsequent recruitment by OX(1)R of the phosphotyrosine phosphatase SHP-2, which is activated thereby. Downstream events include release of cytochrome c from mitochondria and activation of caspase-3 and caspase-7. The role of ITIMs in OX(1)R-driven apoptosis represents a new paradigm of G protein-coupled receptor signalling.
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Affiliation(s)
- Marc Laburthe
- INSERM, U773, Centre de Recherche Biomédicale Bichat Beaujon CRB3, Paris, FranceUniversité Paris Diderot, Paris, France
| | - Thierry Voisin
- INSERM, U773, Centre de Recherche Biomédicale Bichat Beaujon CRB3, Paris, FranceUniversité Paris Diderot, Paris, France
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Intes L, Bahut M, Nicole P, Couvineau A, Guette C, Calenda A. Intestinal cell targeting of a stable recombinant Cu-Zn SOD from Cucumis melo fused to a gliadin peptide. J Biotechnol 2012; 159:99-107. [PMID: 22426094 DOI: 10.1016/j.jbiotec.2012.02.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Revised: 01/09/2012] [Accepted: 02/26/2012] [Indexed: 02/05/2023]
Abstract
The mRNA encoding full length chloroplastic Cu-Zn SOD (superoxide dismutase) of Cucumis melo (Cantaloupe melon) was cloned. This sequence was then used to generate a mature recombinant SOD by deleting the first 64 codons expected to encode a chloroplastic peptide signal. A second hybrid SOD was created by inserting ten codons to encode a gliadin peptide at the N-terminal end of the mature SOD. Taking account of codon bias, both recombinant proteins were successfully expressed and produced in Escherichia coli. Both recombinant SODs display an enzymatic activity of ~5000U mg(-1) and were shown to be stable for at least 4h at 37°C in biological fluids mimicking the conditions of intestinal transit. These recombinant proteins were capable in vitro, albeit at different levels, of reducing ROS-induced-apoptosis of human epithelial cells. They also stimulated production and release in a time-dependent manner of an autologous SOD activity from cells located into jejunum biopsies. Nevertheless, the fused gliadin peptide enable the recombinant Cu-Zn SOD to maintain a sufficiently sustained interaction with the intestinal cells membrane in vivo rather than being eliminated with the flow. According to these observations, the new hybrid Cu-Zn SOD should show promise in applications for managing inflammatory bowel diseases.
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Affiliation(s)
- Laurent Intes
- ISOCELL Pharma-53bd du General Martial Valin, Paris, France
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Biegańska K, Sokołowska P, Jöhren O, Zawilska JB. Orexin A suppresses the growth of rat C6 glioma cells via a caspase-dependent mechanism. J Mol Neurosci 2012; 48:706-12. [PMID: 22588980 PMCID: PMC3447140 DOI: 10.1007/s12031-012-9799-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Accepted: 04/30/2012] [Indexed: 01/16/2023]
Abstract
Orexin A and orexin B (also known as hypocretins) are closely related peptides synthesized by hypothalamic neurons. They orchestrate diverse central and peripheral processes by stimulation of two G-protein coupled receptors, OX1R and OX2R. Recent studies have demonstrated the ability of orexins to promote a robust apoptosis in different cancer cells in culture and a potent growth reduction of human colon tumors in mice xenografts. Here we report effects of orexins on survival of rat C6 glioma cells, an experimental model for studies on glioblastoma multiforme (GBM). Quantitative real-time PCR demonstrated the expression of both types of orexin receptors in C6 cells. Orexin A and orexin B did not affect rat C6 glioma cell proliferation as assessed by [3H]thymidine incorporation assay. Incubation of the cells with orexin A (0.001–1 μM) resulted in a marked decrease of cell viability. The observed effect was caspase-dependent, as it was blocked by Z-VAD-fmk, a pan caspase inhibitor. In addition to that, a parallel increase in caspase-3 activity was observed. It is suggested that stimulation of orexin receptors induces death of rat C6 glioma cells through activation of caspase pathway.
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Affiliation(s)
- Kaja Biegańska
- Institute for Medical Biology, Polish Academy of Sciences, 93-232 Lodz, Poland
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36
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Laburthe M. [How to turn a silent proapoptotic gene in a potent antitumoral target in colorectal cancer]. Med Sci (Paris) 2012; 28:272-3. [PMID: 22480651 DOI: 10.1051/medsci/2012283015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sokołowska P, Urbańska A, Namiecińska M, Biegańska K, Zawilska JB. Orexins promote survival of rat cortical neurons. Neurosci Lett 2011; 506:303-6. [PMID: 22138089 DOI: 10.1016/j.neulet.2011.11.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Revised: 11/14/2011] [Accepted: 11/16/2011] [Indexed: 11/24/2022]
Abstract
Orexin A and B (hypocretin-1 and -2) are hypothalamic peptides that exert their biological functions by stimulation of two specific, membrane-bound receptors, OX(1)R and OX(2)R. Recently, we have demonstrated the expression of both types of orexin receptors in rat cortical neurons, with the OX(2)R level being markedly higher compared to OX(1)R. In the present study we investigated the receptor-mediated effects of orexin A, an agonist of OX(1)R and OX(2) R, orexin B and [Ala(11)-D-Leu(15)]orexin B, preferential agonists of OX(2)R, on survival of cultured neurons derived from rat cerebral cortex. The three tested peptides markedly increased neuronal viability in a concentration-dependent manner. The pro-survival properties of orexins were associated with an attenuation of caspase-3 activity. Comparable potency of orexin A, orexin B and [Ala(11)-D-Leu(15)]orexin B suggests a predominant role of OX(2)R in the studied phenomenon. Our findings provide new insights into the role of orexins in CNS as potential neuroprotective factors.
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Affiliation(s)
- Paulina Sokołowska
- Institute of Medical Biology, Polish Academy of Sciences, Lodowa 106, PL 93-232 Łódź, Poland.
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Gatfield J, Brisbare-Roch C, Jenck F, Boss C. Orexin receptor antagonists: a new concept in CNS disorders? ChemMedChem 2010; 5:1197-214. [PMID: 20544785 DOI: 10.1002/cmdc.201000132] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- John Gatfield
- Drug Discovery Biology, Actelion Pharmaceuticals Ltd, Allschwil/BL, Switzerland
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Expression and localization of the orexin-1 receptor (OX1R) after traumatic brain injury in mice. J Mol Neurosci 2010; 43:162-8. [PMID: 20803175 DOI: 10.1007/s12031-010-9438-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2010] [Accepted: 08/10/2010] [Indexed: 01/30/2023]
Abstract
Orexins are neuropeptides that have a wide range of physiological effects, and recent studies have suggested that the orexin system may be involved in traumatic brain injury. However, the expression and localization of orexin receptors have not been examined yet under brain injury conditions. In the present study, we used immunohistochemical techniques to investigate the expression of orexin-1 receptor (OX1R) and its time-dependent changes in the mouse brain after controlled cortical impact (CCI) injury. OX1R-like immunoreactivity was first detected 6 h after injury in the surrounding penumbra of the injury. The intensity of this immunoreactivity was increased at 12 h, peaked at day 1, and then decreased from day 2 to day 7. To identify the cellular localization of OX1R, we also performed double-immunohistochemical staining with OX1R and several cell marker antibodies. OX1R-like immunopositive cells were clearly co-localized with immunoreactivity for the neuronal marker NeuN at day 7. It was also expressed on the periphery of cells immunopositive for CD11b, a microglial cell marker, at days 1 and 7. These results suggest that orexin and its receptor may play roles in traumatic brain injury, and that OX1R is induced in neurons and microglial cells after traumatic brain injury.
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Laburthe M, Voisin T, El Firar A. Orexins/hypocretins and orexin receptors in apoptosis: a mini-review. Acta Physiol (Oxf) 2010; 198:393-402. [PMID: 19719798 DOI: 10.1111/j.1748-1716.2009.02035.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
An unexpected and fascinating aspect of the neuropeptides orexins has recently emerged when it was shown that orexins acting at orexin receptors OX1R or OX2R induce dramatic apoptosis resulting in massive reduction in cell growth in various cancer cell lines. This mini-review will provide the reader with recent findings related to the proapoptotic actions of orexins and the entirely novel mechanism whereby the seven membrane-spanning G-protein-coupled receptor (GPCR) OX1R triggers apoptosis. Recent data show that orexins induce tyrosine phosphorylation of the tyrosine-based motifs - immunoreceptor tyrosine-based inhibitory motif and immunoreceptor tyrosine-based switch motif - in OX1R. These phosphorylations result in the recruitment and activation of the phosphotyrosine phosphatase SHP-2 and subsequent cytochrome c-mediated mitochondrial apoptosis. Finally, this mini-review will also speculate on: (1) the potential importance of tyrosine-based motifs in the large family of GPCRs; (2) the interest of orexin receptors as therapeutic targets in cancer therapy; (3) the possible role of orexin receptor-mediated apoptosis in physiology and pathophysiology in the brain (neurodevelopment, neurodegenerative diseases) and in the periphery.
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Affiliation(s)
- M Laburthe
- INSERM U773, Centre de Recherche Biomédicale Bichat Beaujon CRB3, Paris, France.
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41
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El Firar A, Voisin T, Rouyer-Fessard C, Ostuni MA, Couvineau A, Laburthe M. Discovery of a functional immunoreceptor tyrosine-based switch motif in a 7-transmembrane-spanning receptor: role in the orexin receptor OX1R-driven apoptosis. FASEB J 2009; 23:4069-80. [PMID: 19661287 DOI: 10.1096/fj.09-131367] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The orexin neuropeptides promote robust apoptosis in cancer cells. We have recently shown that the 7-transmembrane-spanning orexin receptor OX1R mediates apoptosis through an original mechanism. OX1R is equipped with a tyrosine-based inhibitory motif ITIM, which is tyrosine-phosphorylated on receptor activation, allowing the recruitment and activation of the tyrosine phosphatase SHP-2, leading to apoptosis. We show here that another motif, immunoreceptor tyrosine-based switch motif (ITSM), is present in OX1R and is mandatory for OX1R-mediated apoptosis. This conclusion is based on the following observations: 1) a canonical ITSM sequence is present in the first intracellular loop of OX1R; 2) mutation of Y(83) to F within ITSM abolished OX1R-mediated apoptosis but did not alter orexin-induced inositol phosphate formation or calcium transient via coupling of OX1R to G(q) protein; 3) mutation of Y(83) to F further abolished orexin-induced tyrosine phosphorylation in ITSM and subsequent recruitment of SHP-2 by the receptor. Finally, we developed a structural model of OX1R showing that the spatial localization of phosphotyrosines in ITSM and ITIM in OX1R is compatible with their interaction with the two SH2 domains of SHP-2. These data represent the first evidence for a functional role of an ITSM in a 7-transmembrane-spanning receptor.
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Affiliation(s)
- Aadil El Firar
- INSERM U773, Centre de Recherche Biomédicale Bichat Beaujon CRB3, F-75018, Paris
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42
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D'Amora P, Maciel TT, Tambellini R, Mori MA, Pesquero JB, Sato H, Girão MJBC, Guerreiro da Silva IDC, Schor E. Disrupted cell cycle control in cultured endometrial cells from patients with endometriosis harboring the progesterone receptor polymorphism PROGINS. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 175:215-24. [PMID: 19497994 DOI: 10.2353/ajpath.2009.080966] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Presently, little is understood about how endometriosis is established or maintained, or how genetic factors can predispose women to the disease. Because of the crucial role that the progesterone receptor polymorphism PROGINS plays in predisposing women to the development of endometriosis, we hypothesized that this variant may influence critical steps during endometrial cell metabolism that are involved in the pathogenesis of endometriosis. Eutopic endometria were collected from three sources: women with endometriosis who had a single PROGINS allele (from the progesterone receptor gene); women with endometriosis who had the wild-type progesterone receptor allele; and women without endometriosis who had the wild-type allele. Cells prepared from the eutopic endometria of these women were stimulated with both estradiol and progesterone, and then examined for cell proliferation, viability, and apoptosis. The cells from women with endometriosis that carried the PROGINS allele demonstrated increased proliferation, greater viability, and decreased apoptosis following progesterone treatment. In general, these parameters were very different as compared with those of women with endometriosis but without the PROGINS allele and women in the control group. This result indicates there is a reduced level of progesterone responsiveness in women who carry the PROGINS polymorphism. Because progesterone responsiveness is known to be an important characteristic of women with endometriosis, these data support the contention that the PROGINS polymorphism enhances the endometriosis phenotype.
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Affiliation(s)
- Paulo D'Amora
- Pelvic Pain and Endometriosis Unit, Gynecology Department, Molecular Gynecology and Proteomics Laboratory, Universidade Federal de São Paulo - Escola Paulista de Medicina, São Paulo, Brasil.
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Facciolo RM, Crudo M, Giusi G, Alò R, Canonaco M. Light- and dark-dependent orexinergic neuronal signals promote neurodegenerative phenomena accounting for distinct behavioral responses in the teleostThalassoma pavo. J Neurosci Res 2009; 87:748-57. [DOI: 10.1002/jnr.21886] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Marino JH, Tan C, Davis B, Han ES, Hickey M, Naukam R, Taylor A, Miller KS, Van De Wiele CJ, Teague TK. Disruption of thymopoiesis in ST6Gal I-deficient mice. Glycobiology 2008; 18:719-26. [PMID: 18535087 DOI: 10.1093/glycob/cwn051] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Thymocyte development is accompanied by sequential changes in cell surface glycosylation. For example, medullary thymocytes have increased levels of alpha2,3-linked sialic acid and a loss of asialo core 1 O-glycans as compared to cortical thymocytes. Some of these changes have been linked to fine tuning of the T cell receptor avidity. We analyzed ST6Gal I transcript abundance and levels of alpha2,6-linked sialic acid across thymocyte subsets. We found that ST6Gal I transcript levels increased following T cell receptor beta-selection suggesting that this sialyltransferase may influence the development of early thymocyte populations. Indeed, low levels of alpha2,6-linked sialic acid were found in the earliest T lineage cells, and then increased in T cell receptor beta-selected cells. To determine whether ST6Gal I influences T cell development, we analyzed ST6Gal I-deficient mice for disruptions in thymocyte populations. We found reduced thymic cellularity in the ST6Gal I-deficient mice starting in the early thymocyte compartments.
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Affiliation(s)
- Julie H Marino
- Department of Surgery, University of Oklahoma College of Medicine, Tulsa, OK 74135, USA
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Voisin T, Firar AE, Rouyer‐Fessard C, Gratio V, Laburthe M. A hallmark of immunoreceptor, the tyrosine‐based inhibitory motif ITIM, is present in the G protein‐coupled receptor OX1R for orexins and drives apoptosis: a novel mechanism. FASEB J 2008; 22:1993-2002. [DOI: 10.1096/fj.07-098723] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Thierry Voisin
- INSERMU773Centre de Recherche Biomédicale Bichat Beaujon CRB3Université Paris DiderotUMR S 773ParisFrance
| | - Aadil El Firar
- INSERMU773Centre de Recherche Biomédicale Bichat Beaujon CRB3Université Paris DiderotUMR S 773ParisFrance
| | - Christiane Rouyer‐Fessard
- INSERMU773Centre de Recherche Biomédicale Bichat Beaujon CRB3Université Paris DiderotUMR S 773ParisFrance
| | - Valérie Gratio
- INSERMU773Centre de Recherche Biomédicale Bichat Beaujon CRB3Université Paris DiderotUMR S 773ParisFrance
| | - Marc Laburthe
- INSERMU773Centre de Recherche Biomédicale Bichat Beaujon CRB3Université Paris DiderotUMR S 773ParisFrance
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