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Sahoo P, Sarkar D, Sharma S, Verma A, Naik SK, Prashar V, Parkash J, Singh SK. Knockdown of type 2 orexin receptor in adult mouse testis potentiates testosterone production and germ cell proliferation. Mol Cell Endocrinol 2024; 592:112312. [PMID: 38866320 DOI: 10.1016/j.mce.2024.112312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 06/06/2024] [Accepted: 06/08/2024] [Indexed: 06/14/2024]
Abstract
Orexins (OXs) are neuropeptides which regulate various physiological processes. OXs exist in two different forms, mainly orexin A (OXA) and orexin B (OXB) and their effects are mediated via OX1R and OX2R. Presence of OXB and OX2R in mouse testis is also reported. However, the role of OXB/OX2R in the male gonad remains unexplored. Herein we investigated the role of OXB/OX2R system in testicular physiology under in vivo and ex vivo conditions. Adult mice were given a single dose of bilateral intratesticular injection of siRNA targeting OX2R and were sacrificed 96 h post-injection. OX2R-knockdown potentiated serum and intratesticular testosterone levels with up-regulation in the expressions of major steroidogenic proteins. Germ cell proliferation also increased in siRNA-treated mice. Results of the ex vivo experiment also supported the findings of the in vivo study. In conclusion, OX2R may regulate testosterone production and thereby control the fine-tuning between steroidogenesis and germ cell dynamics.
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Affiliation(s)
- Pratikshya Sahoo
- Department of Zoology, School of Basic Sciences, Central University of Punjab, VPO-Ghudda, Bathinda, 151401, India
| | - Debarshi Sarkar
- Department of Zoology, School of Basic Sciences, Central University of Punjab, VPO-Ghudda, Bathinda, 151401, India.
| | - Shubhangi Sharma
- Department of Zoology, School of Basic Sciences, Central University of Punjab, VPO-Ghudda, Bathinda, 151401, India
| | - Arpit Verma
- Department of Zoology, School of Basic Sciences, Central University of Punjab, VPO-Ghudda, Bathinda, 151401, India
| | - Suraj Kumar Naik
- Department of Zoology, School of Basic Sciences, Central University of Punjab, VPO-Ghudda, Bathinda, 151401, India
| | - Vikash Prashar
- Department of Zoology, School of Basic Sciences, Central University of Punjab, VPO-Ghudda, Bathinda, 151401, India
| | - Jyoti Parkash
- Department of Zoology, School of Basic Sciences, Central University of Punjab, VPO-Ghudda, Bathinda, 151401, India
| | - Shio Kumar Singh
- Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi-221005, India
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Gratio V, Dayot S, Benadda S, Nicole P, Saveanu L, Voisin T, Couvineau A. Imaging flow cytometry of tumoroids: A new method for studying GPCR expression. Cytometry A 2024; 105:276-287. [PMID: 38017661 DOI: 10.1002/cyto.a.24809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 10/11/2023] [Accepted: 11/13/2023] [Indexed: 11/30/2023]
Abstract
Fluorescence confocal microscopy is commonly used to analyze the regulation membrane proteins expression such as G protein-coupled receptors (GPCRs). With this approach, the internal movement of GPCRs within the cell can be observed with a high degree of resolution. However, these microscopy techniques led to complex and time-consuming analysis and did not allow a large population of events to be sampled. A recent approach termed imaging flow cytometry (IFC), which combines flow cytometry and fluorescence microscopy, had two main advantages to study the regulation of GPCRs expression such as orexins receptors (OXRs): the ability (1) to analyze large numbers of cells and; (2) to visualize cell integrity and fluorescent markers localization. Here, we compare these two technologies using the orexin A (OxA) ligand coupled to rhodamine (OxA-rho) to investigate anti-tumoral OX1R expression in human digestive cancers. IFC has been adapted for cancer epithelial adherent cells and also to 3D cell culture tumoroids which partially mimic tumoral structures. In the absence of specific antibody, expression of OX1R is examined in the presence of OxA-rho. 2D-culture of colon cancer cells HT-29 exhibits a maximum level of OX1R internalization induced by OxA with 19% ± 3% colocalizing to early endosomes. In 3D-culture of HT-29 cells, internalization of OX1R/OxA-rho reached its maximum at 60 min, with 30.7% ± 6.4% of OX1R colocalizing with early endosomes. This is the first application of IFC to the analysis of the expression of a native GPCR, OX1R, in both 2D and 3D cultures of adherent cancer cells.
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Affiliation(s)
- V Gratio
- INSERM UMR1149/Inflammation Research Center (CRI), Université Paris Cité, Team "From Inflammation to Cancer in Digestive Diseases (INDiD)", DHU UNITY, Paris, France
- INSERM UMR1149/Inflammation Research Center (CRI), Université Paris Cité, Flow Cytometry Platform (CytoCRI), DHU UNITY, Paris, France
| | - S Dayot
- INSERM UMR1149/Inflammation Research Center (CRI), Université Paris Cité, Team "From Inflammation to Cancer in Digestive Diseases (INDiD)", DHU UNITY, Paris, France
| | - S Benadda
- INSERM UMR1149/Inflammation Research Center (CRI), Université Paris Cité, Photonic Imaging Platform (IMA'CRI), DHU UNITY, Paris, France
| | - P Nicole
- INSERM UMR1149/Inflammation Research Center (CRI), Université Paris Cité, Team "From Inflammation to Cancer in Digestive Diseases (INDiD)", DHU UNITY, Paris, France
| | - L Saveanu
- INSERM UMR1149/Inflammation Research Center (CRI), Université Paris Cité, Team "Antigen Presentation by Dendritic Cells to T cells (APreT)", DHU UNITY, Paris, France
| | - T Voisin
- INSERM UMR1149/Inflammation Research Center (CRI), Université Paris Cité, Team "From Inflammation to Cancer in Digestive Diseases (INDiD)", DHU UNITY, Paris, France
| | - A Couvineau
- INSERM UMR1149/Inflammation Research Center (CRI), Université Paris Cité, Team "From Inflammation to Cancer in Digestive Diseases (INDiD)", DHU UNITY, Paris, France
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Farajzadeh-Dehkordi M, Mafakher L, Harifi A, Haghdoost-Yazdi H, Piri H, Rahmani B. Unraveling the function and structure impact of deleterious missense SNPs in the human OX1R receptor by computational analysis. Sci Rep 2024; 14:833. [PMID: 38191899 PMCID: PMC10774445 DOI: 10.1038/s41598-023-49809-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 12/12/2023] [Indexed: 01/10/2024] Open
Abstract
The orexin/hypocretin receptor type 1 (OX1R) plays a crucial role in regulating various physiological functions, especially feeding behavior, addiction, and reward. Genetic variations in the OX1R have been associated with several neurological disorders. In this study, we utilized a combination of sequence and structure-based computational tools to identify the most deleterious missense single nucleotide polymorphisms (SNPs) in the OX1R gene. Our findings revealed four highly conserved and structurally destabilizing missense SNPs, namely R144C, I148N, S172W, and A297D, located in the GTP-binding domain. Molecular dynamics simulations analysis demonstrated that all four most detrimental mutant proteins altered the overall structural flexibility and dynamics of OX1R protein, resulting in significant changes in the structural organization and motion of the protein. These findings provide valuable insights into the impact of missense SNPs on OX1R function loss and their potential contribution to the development of neurological disorders, thereby guiding future research in this field.
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Affiliation(s)
- Mahvash Farajzadeh-Dehkordi
- Student Research Committee, Qazvin University of Medical Sciences, Qazvin, Iran
- Department of Molecular Medicine, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Ladan Mafakher
- Thalassemia & Hemoglobinopathy Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Abbas Harifi
- Department of Electrical and Computer Engineering, University of Hormozgan, Bandar Abbas, Hormozgan, Iran
| | - Hashem Haghdoost-Yazdi
- Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Hossein Piri
- Cellular and Molecular Research Center, Research Institute for Prevention of Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Babak Rahmani
- Student Research Committee, Qazvin University of Medical Sciences, Qazvin, Iran.
- Department of Molecular Medicine, Qazvin University of Medical Sciences, Qazvin, Iran.
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Blais A, Lan A, Blachier F, Benamouzig R, Jouet P, Couvineau A. Efficiency of Orexin-A for Inflammatory Flare and Mucosal Healing in Experimental Colitis: Comparison with the Anti-TNF Alpha Infliximab. Int J Mol Sci 2023; 24:ijms24119554. [PMID: 37298505 DOI: 10.3390/ijms24119554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 05/25/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023] Open
Abstract
Inflammatory bowel diseases are chronic inflammation of the intestinal mucosa characterized by relapsing-remitting cycle periods of variable duration. Infliximab (IFX) was the first monoclonal antibody used for the treatment of Crohn's disease and ulcerative colitis (UC). High variability between treated patients and loss of IFX efficiency over time support the further development of drug therapy. An innovative approach has been suggested based on the presence of orexin receptor (OX1R) in the inflamed human epithelium of UC patients. In that context, the aim of this study was to compare, in a mouse model of chemically induced colitis, the efficacy of IFX compared to the hypothalamic peptide orexin-A (OxA). C57BL/6 mice received 3.5% dextran sodium sulfate (DSS) in drinking water for 5 days. Since the inflammatory flare was maximal at day 7, IFX or OxA was administered based on a curative perspective at that time for 4 days using intraperitoneal injection. Treatment with OxA promoted mucosal healing and decreased colonic myeloperoxidase activity, circulating concentrations of lipopolysaccharide-binding protein, IL-6 and tumor necrosis factor alpha (TNFα) and decreased expression of genes encoding cytokines in colonic tissues with better efficacy than IFX allowing for more rapid re-epithelization. This study demonstrates the comparable anti-inflammatory properties of OxA and IFX and shows that OxA is efficient in promoting mucosal healing, suggesting that OxA treatment is a promising new biotherapy.
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Affiliation(s)
- Anne Blais
- UMR-PNCA, Université Paris-Saclay, AgroParisTech, INRAE, 91120 Palaiseau, France
| | - Annaïg Lan
- UMR-PNCA, Université Paris-Saclay, AgroParisTech, INRAE, 91120 Palaiseau, France
| | - François Blachier
- UMR-PNCA, Université Paris-Saclay, AgroParisTech, INRAE, 91120 Palaiseau, France
| | - Robert Benamouzig
- UMR-PNCA, Université Paris-Saclay, AgroParisTech, INRAE, 91120 Palaiseau, France
- Hôpital Avicenne, Assistance Publique-Hôpitaux de Paris, 93000 Bobigny, France
| | - Pauline Jouet
- Hôpital Avicenne, Assistance Publique-Hôpitaux de Paris, 93000 Bobigny, France
| | - Alain Couvineau
- INSERM UMR 1149/Centre de Recherche sur l'Inflammation (CRI), Faculté de Médecine X. Bichat, Université Paris Cité, 75018 Paris, France
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Yang S, Huan R, Yue J, Guo J, Deng M, Wang L, Peng S, Lin X, Liu L, Wang J, Han G, Zha Y, Liu J, Zhang J, Tan Y. Multiomics integration reveals the effect of Orexin A on glioblastoma. Front Pharmacol 2023; 14:1096159. [PMID: 36744263 PMCID: PMC9894894 DOI: 10.3389/fphar.2023.1096159] [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: 11/14/2022] [Accepted: 01/10/2023] [Indexed: 01/22/2023] Open
Abstract
Objectives: This study involved a multi-omics analysis of glioblastoma (GBM) samples to elaborate the potential mechanism of drug treatment. Methods: The GBM cells treated with or without orexin A were acquired from sequencing analysis. Differentially expressed genes/proteins/metabolites (DEGs/ DEPs/ DEMs) were screened. Next, combination analyses were conducted to investigate the common pathways and correlations between the two groups. Lastly, transcriptome-proteome-metabolome association analysis was carried out to determine the common pathways, and the genes in these pathways were analyzed through Kaplan-Meier (K-M) survival analysis in public databases. Cell and animal experiments were performed to investigate the anti-glioma activity of orexin A. Results: A total of 1,527 DEGs, 52 DEPs, and 153 DEMs were found. Moreover, the combination analyses revealed that 6, 4, and 1 common pathways were present in the transcriptome-proteome, proteome-metabolome, and transcriptome-metabolome, respectively. Certain correlations were observed between the two data sets. Finally, 11 common pathways were discovered in association analysis, and 138 common genes were screened out in these common pathways. Six genes showed significant differences in terms of survival in both TCGA and CGGA. In addition, orexin A inhibited the proliferation, migration, and invasion of glioma in vitro and in vivo. Conclusion: Eleven common KEGG pathways with six common genes were found among different omics participations, revealing the underlying mechanisms in different omics and providing theoretical basis and reference for multi-omics research on drug treatment.
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Affiliation(s)
- Sha Yang
- Guizhou University Medical College, Guiyang, Guizhou Province, China
| | - Renzheng Huan
- Department of Neurosurgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jianhe Yue
- Department of Neurosurgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jin Guo
- Guizhou University Medical College, Guiyang, Guizhou Province, China
| | - Mei Deng
- Department of Neurosurgery, Guizhou Provincial People’s Hospital, Guiyang, China
| | - Liya Wang
- Department of Neurosurgery, Guizhou Provincial People’s Hospital, Guiyang, China
| | - Shuo Peng
- Department of Neurosurgery, Guizhou Provincial People’s Hospital, Guiyang, China
| | - Xin Lin
- Department of Nephrology, Guizhou Provincial People’s Hospital, Guiyang, China
| | - Lin Liu
- Department of Respiratory and Critical Care Medicine, Guizhou Provincial People’s Hospital, Guiyang, China
| | - Jia Wang
- Department of Neurosurgery, Chongqing Emergency Medical Center, Chongqing, China
| | - Guoqiang Han
- Department of Neurosurgery, Guizhou Provincial People’s Hospital, Guiyang, China
| | - Yan Zha
- Department of Nephrology, Guizhou Provincial People’s Hospital, Guiyang, China
| | - Jian Liu
- Guizhou University Medical College, Guiyang, Guizhou Province, China,Department of Neurosurgery, Guizhou Provincial People’s Hospital, Guiyang, China,*Correspondence: Jian Liu, ; Jiqin Zhang, ; Ying Tan,
| | - Jiqin Zhang
- Department of Anesthesiology, Guizhou Provincial People’s Hospital, Guiyang, China,*Correspondence: Jian Liu, ; Jiqin Zhang, ; Ying Tan,
| | - Ying Tan
- Department of Neurosurgery, Guizhou Provincial People’s Hospital, Guiyang, China,*Correspondence: Jian Liu, ; Jiqin Zhang, ; Ying Tan,
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A photocaged orexin-B for spatiotemporally precise control of orexin signaling. Cell Chem Biol 2022; 29:1729-1738.e8. [PMID: 36481097 PMCID: PMC9794195 DOI: 10.1016/j.chembiol.2022.11.007] [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: 05/10/2022] [Revised: 10/04/2022] [Accepted: 11/14/2022] [Indexed: 12/12/2022]
Abstract
Orexin neuropeptides carry out important neuromodulatory functions in the brain, yet tools to precisely control the activation of endogenous orexin signaling are lacking. Here, we developed a photocaged orexin-B (photo-OXB) through a C-terminal photocaging strategy. We show that photo-OXB is unable to activate its cognate receptors in the dark but releases functionally active native orexin-B upon uncaging by illumination with UV-visible (UV-vis) light (370-405 nm). We established an all-optical assay combining photo-OXB with a genetically encoded orexin biosensor and used it to characterize the efficiency and spatial profile of photo-OXB uncaging. Finally, we demonstrated that photo-OXB enables optical control over orexin signaling with fine temporal precision both in vitro and ex vivo. Thus, our photocaging strategy and photo-OXB advance the chemical biological toolkit by introducing a method for the optical control of peptide signaling and physiological function.
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Couvineau A, Nicole P, Gratio V, Voisin T. The Orexin receptors: Structural and anti-tumoral properties. Front Endocrinol (Lausanne) 2022; 13:931970. [PMID: 35966051 PMCID: PMC9365956 DOI: 10.3389/fendo.2022.931970] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 07/11/2022] [Indexed: 12/12/2022] Open
Abstract
At the end of the 20th century, two new neuropeptides (Orexin-A/hypocretin-1 and Orexin-B/hypocretins-2) expressed in hypothalamus as a prepro-orexins precursor, were discovered. These two neuropeptides interacted with two G protein-coupled receptor isoforms named OX1R and OX2R. The orexins/OX receptors system play an important role in the central and peripheral nervous system where it controls wakefulness, addiction, reward seeking, stress, motivation, memory, energy homeostasis, food intake, blood pressure, hormone secretions, reproduction, gut motility and lipolysis. Orexins and their receptors are involved in pathologies including narcolepsy type I, neuro- and chronic inflammation, neurodegenerative diseases, metabolic syndrome, and cancers. Associated with these physiopathological roles, the extensive development of pharmacological molecules including OXR antagonists, has emerged in association with the determination of the structural properties of orexins and their receptors. Moreover, the identification of OX1R expression in digestive cancers encompassing colon, pancreas and liver cancers and its ability to trigger mitochondrial apoptosis in tumoral cells, indicate a new putative therapeutical action of orexins and paradoxically OXR antagonists. The present review focuses on structural and anti-tumoral aspects of orexins and their receptors.
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Couvineau A, Voisin T, Nicole P, Gratio V, Blais A. Orexins: A promising target to digestive cancers, inflammation, obesity and metabolism dysfunctions. World J Gastroenterol 2021; 27:7582-7596. [PMID: 34908800 PMCID: PMC8641057 DOI: 10.3748/wjg.v27.i44.7582] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 06/22/2021] [Accepted: 11/18/2021] [Indexed: 02/06/2023] Open
Abstract
Hypothalamic neuropeptides named hypocretin/orexins which were identified in 1998 regulate critical functions such as wakefulness in the central nervous system. These past 20 years had revealed that orexins/receptors system was also present in the peripheral nervous system where they participated to the regulation of multiple functions including blood pressure regulation, intestinal motility, hormone secretion, lipolyze and reproduction functions. Associated to these peripheral functions, it was found that orexins and their receptors were involved in various diseases such as acute/chronic inflammation, metabolic syndrome and cancers. The present review suggests that orexins or the orexin neural circuitry represent potential therapeutic targets for the treatment of multiple pathologies related to inflammation including intestinal bowel disease, multiple sclerosis and septic shock, obesity and digestive cancers.
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Affiliation(s)
- Alain Couvineau
- INSERM UMR1149/Inflammation Research Center, Team “From inflammation to cancer in digestive diseases” labeled by “la Ligue Nationale contre le Cancer”, University of Paris, DHU UNITY, Paris 75018, France
| | - Thierry Voisin
- INSERM UMR1149/Inflammation Research Center, Team “From inflammation to cancer in digestive diseases” labeled by “la Ligue Nationale contre le Cancer”, University of Paris, DHU UNITY, Paris 75018, France
| | - Pascal Nicole
- INSERM UMR1149/Inflammation Research Center, Team “From inflammation to cancer in digestive diseases” labeled by “la Ligue Nationale contre le Cancer”, University of Paris, DHU UNITY, Paris 75018, France
| | - Valerie Gratio
- INSERM UMR1149/Inflammation Research Center, Team “From inflammation to cancer in digestive diseases” labeled by “la Ligue Nationale contre le Cancer”, University of Paris, DHU UNITY, Paris 75018, France
| | - Anne Blais
- UMR PNCA, AgroParisTech, INRA, Université Paris-Saclay, Paris 75005, France
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Alain C, Pascal N, Valérie G, Thierry V. Orexins/Hypocretins and Cancer: A Neuropeptide as Emerging Target. Molecules 2021; 26:molecules26164849. [PMID: 34443437 PMCID: PMC8398691 DOI: 10.3390/molecules26164849] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/03/2021] [Accepted: 08/06/2021] [Indexed: 02/05/2023] Open
Abstract
Over 20 years ago, orexin neuropeptides (Orexin-A/hypocretin-1 and Orexin-B/hypocretins-2) produced from the same precursor in hypothalamus were identified. These two neurotransmitters and their receptors (OX1R and OX1R), present in the central and peripheral nervous system, play a major role in wakefulness but also in drug addiction, food consumption, homeostasis, hormone secretion, reproductive function, lipolysis and blood pressure regulation. With respect to these biological functions, orexins were involved in various pathologies encompassing narcolepsy, neurodegenerative diseases, chronic inflammations, metabolic syndrome and cancers. The expression of OX1R in various cancers including colon, pancreas and prostate cancers associated with its ability to induce a proapoptotic activity in tumor cells, suggested that the orexins/OX1R system could have a promising therapeutic role. The present review summarizes the relationship between cancers and orexins/OX1R system as an emerging target.
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Affiliation(s)
- Couvineau Alain
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From Inflammation to Cancer in Digestive Diseases" Labeled by "la Ligue Nationale Contre le Cancer", University of Paris, DHU UNITY, 75018 Paris, France
| | - Nicole Pascal
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From Inflammation to Cancer in Digestive Diseases" Labeled by "la Ligue Nationale Contre le Cancer", University of Paris, DHU UNITY, 75018 Paris, France
| | - Gratio Valérie
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From Inflammation to Cancer in Digestive Diseases" Labeled by "la Ligue Nationale Contre le Cancer", University of Paris, DHU UNITY, 75018 Paris, France
| | - Voisin Thierry
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From Inflammation to Cancer in Digestive Diseases" Labeled by "la Ligue Nationale Contre le Cancer", University of Paris, DHU UNITY, 75018 Paris, France
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10
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Couvineau A, Voisin T, Nicole P, Gratio V, Abad C, Tan YV. Orexins as Novel Therapeutic Targets in Inflammatory and Neurodegenerative Diseases. Front Endocrinol (Lausanne) 2019; 10:709. [PMID: 31695678 PMCID: PMC6817618 DOI: 10.3389/fendo.2019.00709] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 10/02/2019] [Indexed: 02/05/2023] Open
Abstract
Orexins [orexin-A (OXA) and orexin-B (OXB)] are two isoforms of neuropeptides produced by the hypothalamus. The main biological actions of orexins, focused on the central nervous system, are to control the sleep/wake process, appetite and feeding, energy homeostasis, drug addiction, and cognitive processes. These effects are mediated by two G protein-coupled receptor (GPCR) subtypes named OX1R and OX2R. In accordance with the synergic and dynamic relationship between the nervous and immune systems, orexins also have neuroprotective and immuno-regulatory (i.e., anti-inflammatory) properties. The present review gathers recent data demonstrating that orexins may have a therapeutic potential in several pathologies with an immune component including multiple sclerosis, Alzheimer's disease, narcolepsy, obesity, intestinal bowel diseases, septic shock, and cancers.
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Affiliation(s)
- Alain Couvineau
- INSERM UMR1149/Inflammation Research Center (CRI), Team “From Inflammation to Cancer in Digestive Diseases” Labeled by “la Ligue Nationale Contre le Cancer”, University of Paris, Paris, France
- *Correspondence: Alain Couvineau
| | - Thierry Voisin
- INSERM UMR1149/Inflammation Research Center (CRI), Team “From Inflammation to Cancer in Digestive Diseases” Labeled by “la Ligue Nationale Contre le Cancer”, University of Paris, Paris, France
| | - Pascal Nicole
- INSERM UMR1149/Inflammation Research Center (CRI), Team “From Inflammation to Cancer in Digestive Diseases” Labeled by “la Ligue Nationale Contre le Cancer”, University of Paris, Paris, France
| | - Valérie Gratio
- INSERM UMR1149/Inflammation Research Center (CRI), Team “From Inflammation to Cancer in Digestive Diseases” Labeled by “la Ligue Nationale Contre le Cancer”, University of Paris, Paris, France
| | - Catalina Abad
- University of Rouen Normandy, INSERM U1234 PANTHER, IRIB, Rouen, France
| | - Yossan-Var Tan
- University of Rouen Normandy, INSERM U1234 PANTHER, IRIB, Rouen, France
- Yossan-Var Tan
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11
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Messal N, Fernandez N, Dayot S, Gratio V, Nicole P, Prochasson C, Chantret I, LeGuilloux G, Jarry A, Couvelard A, Tréton X, Voisin T, Ogier-Denis E, Couvineau A. Ectopic expression of OX1R in ulcerative colitis mediates anti-inflammatory effect of orexin-A. Biochim Biophys Acta Mol Basis Dis 2018; 1864:3618-3628. [PMID: 30251681 DOI: 10.1016/j.bbadis.2018.08.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 08/07/2018] [Accepted: 08/17/2018] [Indexed: 02/08/2023]
Abstract
Orexins (orexin-A and orexin-B) are hypothalamic peptides that are produced by the same precursor and are involved in sleep/wake control, which is mediated by two G protein-coupled receptor subtypes, OX1R and OX2R. Ulcerative colitis (UC) is an inflammatory bowel disease, (IBD) which is characterized by long-lasting inflammation and ulcers that affect the colon and rectum mucosa and is known to be a significant risk factor for colon cancer development. Based on our recent studies showing that OX1R is aberrantly expressed in colon cancer, we wondered whether orexin-A could play a role in UC. Immunohistochemistry studies revealed that OX1R is highly expressed in the affected colonic epithelium of most UC patients, but not in the non-affected colonic mucosa. Injection of exogenous orexin-A specifically improved the inflammatory symptoms in the two colitis murine models. Conversely, injection of inactive orexin-A analog, OxB7-28 or OX1R specific antagonist SB-408124 did not have anti-inflammatory effect. Moreover, treatment with orexin-A in DSS-colitis induced OX1R-/- knockout mice did not have any protective effect. The orexin-A anti-inflammatory effect was due to the decreased expression of pro-inflammatory cytokines in immune cells and specifically in T-cells isolated from colonic mucosa. Moreover, orexin-A inhibited canonical NFκB activation in an immune cell line and in intestinal epithelial cell line. These results suggest that orexin-A might represent a promising alternative to current UC therapies.
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Affiliation(s)
- N Messal
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From inflammation to cancer in digestive diseases" labeled by "la Ligue Nationale contre le Cancer", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - N Fernandez
- INSERM UMR1149/Inflammation Research Center (CRI), Team "Intestinal inflammation", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - S Dayot
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From inflammation to cancer in digestive diseases" labeled by "la Ligue Nationale contre le Cancer", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - V Gratio
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From inflammation to cancer in digestive diseases" labeled by "la Ligue Nationale contre le Cancer", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - P Nicole
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From inflammation to cancer in digestive diseases" labeled by "la Ligue Nationale contre le Cancer", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - C Prochasson
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From inflammation to cancer in digestive diseases" labeled by "la Ligue Nationale contre le Cancer", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - I Chantret
- INSERM UMR1149/Inflammation Research Center (CRI), Team "Inflammatory and stress responses in chronic liver diseases", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - G LeGuilloux
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From inflammation to cancer in digestive diseases" labeled by "la Ligue Nationale contre le Cancer", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - A Jarry
- EA4273 Biometadys, Faculté de Médecine, Université de Nantes, 1 Rue Gaston Veil, 44035 Nantes, France
| | - A Couvelard
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From inflammation to cancer in digestive diseases" labeled by "la Ligue Nationale contre le Cancer", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - X Tréton
- INSERM UMR1149/Inflammation Research Center (CRI), Team "Intestinal inflammation", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - T Voisin
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From inflammation to cancer in digestive diseases" labeled by "la Ligue Nationale contre le Cancer", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - E Ogier-Denis
- INSERM UMR1149/Inflammation Research Center (CRI), Team "Intestinal inflammation", Paris-Diderot University, DHU UNITY, 75018 Paris, France
| | - A Couvineau
- INSERM UMR1149/Inflammation Research Center (CRI), Team "From inflammation to cancer in digestive diseases" labeled by "la Ligue Nationale contre le Cancer", Paris-Diderot University, DHU UNITY, 75018 Paris, France.
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Bai Q, Pérez-Sánchez H, Shi Z, Li L, Shi D, Liu H, Yao X. Computational studies on horseshoe shape pocket of human orexin receptor type 2 and boat conformation of suvorexant by molecular dynamics simulations. Chem Biol Drug Des 2018; 92:1221-1231. [PMID: 29450984 DOI: 10.1111/cbdd.13181] [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: 09/07/2017] [Revised: 11/08/2017] [Accepted: 11/11/2017] [Indexed: 12/29/2022]
Abstract
The FDA approved drug suvorexant binds to the horseshoe shape pocket of OX2 R with the boat conformation. The horseshoe shape pocket plays an important role on the biological activity of OX2 R in the cell membrane. To study the binding mechanism between the horseshoe shape pocket of OX2 R and boat conformation of suvorexant, the crystal structures of wild type and N324A mutant of OX2 R in complex with antagonist suvorexant are chosen to perform molecular dynamics (MD) simulations, QM/MM, and MMGBSA calculations. By comparison with the wild type of OX2 R, the results show the 1,2,3-triazole and p-toluamide groups of suvorexant are changed in the N324A mutant of OX2 R during 200 ns MD simulations. The QM/MM and weak interaction analysis are employed to calculate the non-covalent bonds interaction between suvorexant and key residues in the wild type and N324A mutant of OX2 R. The MMGBSA calculations indicate the entropy energy is an important influence factor for suvorexant affinity in the distorted horseshoe shape pocket of OX2 R. Our results not only show the horseshoe shape pocket of OX2 R is the necessary conformation for the binding of antagonist suvorexant, but also give the important sites and structural features for antagonist design of OX2 R.
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Affiliation(s)
- Qifeng Bai
- Key Lab of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, China
| | - Horacio Pérez-Sánchez
- Computer Science Department, Universidad Católica San Antonio de Murcia (UCAM), Murcia, Spain
| | - Zhuoyu Shi
- Key Lab of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, China
| | - Lanlan Li
- Department of Chemistry, Lanzhou University, Lanzhou, Gansu, China
| | - Danfeng Shi
- Department of Chemistry, Lanzhou University, Lanzhou, Gansu, China
| | - Huanxiang Liu
- Key Lab of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, China
| | - Xiaojun Yao
- Key Lab of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou, Gansu, China.,Department of Chemistry, Lanzhou University, Lanzhou, Gansu, China
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Dayot S, Speisky D, Couvelard A, Bourgoin P, Gratio V, Cros J, Rebours V, Sauvanet A, Bedossa P, Paradis V, Ruszniewski P, Couvineau A, Voisin T. In vitro, in vivo and ex vivo demonstration of the antitumoral role of hypocretin-1/orexin-A and almorexant in pancreatic ductal adenocarcinoma. Oncotarget 2018; 9:6952-6967. [PMID: 29467942 PMCID: PMC5805528 DOI: 10.18632/oncotarget.24084] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2017] [Accepted: 01/02/2018] [Indexed: 02/05/2023] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is still the poorest prognostic tumor of the digestive system. We investigated the antitumoral role of orexin-A and almorexant in PDAC. We analyzed the orexin receptor type 1 (OX1R) expression by immunohistochemistry in human normal pancreas, PDAC and its precursor dysplastic intraepithelial lesions. We used PDAC-derived cell lines and fresh tissue slices to study the apoptotic role of hypocretin-1/orexin-A and almorexant in vitro and ex vivo. We analyzed in vivo the hypocretin-1/orexin-A and almorexant effect on tumor growth in mice xenografted with PDAC cell lines expressing, or not, OX1R. Ninety-six percent of PDAC expressed OX1R, while adjacent normal exocrine pancreas did not. OX1R was expressed in pre-cancerous lesions. In vitro, under hypocretin-1/orexin-A and almorexant, the OX1R-positive AsPC-1 cells underwent apoptosis, abolished by the tyrosine phosphatase SHP2 inhibitor, NSC-87877, whereas the OX1R-negative HPAF-II cell line did not. These effects were mediated by phosphorylation of OX1R and recruitment of SHP2. Ex vivo, caspase-3 positive tumor cells were significantly higher in fresh tumour slices treated 48h with hypocretin-1/orexin-A, as compared to control, whereas cellular proliferation, assessed by Ki-67 index, was not modified. In vivo, when AsPC-1 cells or patient-derived cells were xenografted in nude mice, hypocretin-1/orexin-A or almorexant, administrated both starting the day of cell line inoculation or after tumoral development, strongly slowed tumor growth. Hypocretin-1/orexin-A and almorexant induce, through OX1R, the inhibition of PDAC cellular growth by apoptosis. Hypocretins/orexins and almorexant might be powerful candidates for the treatment of PDAC.
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Affiliation(s)
- Stéphanie Dayot
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
| | - Daniela Speisky
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
| | - Anne Couvelard
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
- 2 Département de Pathologie Beaujon-Bichat, AP-HP, Hôpital Bichat, Huchard, 75018 Paris, France
| | - Pierre Bourgoin
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
| | - Valérie Gratio
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
| | - Jérôme Cros
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
- 4 Département de Pathologie Beaujon-Bichat, AP-HP, Hôpital Beaujon, 92118 Clichy, France
| | - Vinciane Rebours
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
- 3 Service de Pancréatologie-Gastroentérologie PMAD, Pôle des Maladies de l’Appareil Digestif, AP-HP, Hôpital Beaujon, 92118 Clichy, France
| | - Alain Sauvanet
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
- 3 Service de Pancréatologie-Gastroentérologie PMAD, Pôle des Maladies de l’Appareil Digestif, AP-HP, Hôpital Beaujon, 92118 Clichy, France
| | - Pierre Bedossa
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
- 4 Département de Pathologie Beaujon-Bichat, AP-HP, Hôpital Beaujon, 92118 Clichy, France
| | - Valérie Paradis
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
- 4 Département de Pathologie Beaujon-Bichat, AP-HP, Hôpital Beaujon, 92118 Clichy, France
| | - Philippe Ruszniewski
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
- 3 Service de Pancréatologie-Gastroentérologie PMAD, Pôle des Maladies de l’Appareil Digestif, AP-HP, Hôpital Beaujon, 92118 Clichy, France
| | - Alain Couvineau
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
| | - Thierry Voisin
- 1 INSERM UMR1149 Centre de Recherche sur l’Inflammation (CRI), Université Paris-Diderot, Sorbonne Paris Cité, DHU UNITY, Faculté de Médecine Xavier Bichat, Huchard, 75018 Paris, France
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Couvineau A, Dayot S, Nicole P, Gratio V, Rebours V, Couvelard A, Voisin T. The Anti-tumoral Properties of Orexin/Hypocretin Hypothalamic Neuropeptides: An Unexpected Therapeutic Role. Front Endocrinol (Lausanne) 2018; 9:573. [PMID: 30319552 PMCID: PMC6170602 DOI: 10.3389/fendo.2018.00573] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 09/10/2018] [Indexed: 02/05/2023] Open
Abstract
Orexins (OxA and OxB) also termed hypocretins are hypothalamic neuropeptides involved in central nervous system (CNS) to control the sleep/wake process which is mediated by two G protein-coupled receptor subtypes, OX1R, and OX2R. Beside these central effects, orexins also play a role in various peripheral organs such as the intestine, pancreas, adrenal glands, kidney, adipose tissue and reproductive tract.In the past few years, an unexpected anti-tumoral role of orexins mediated by a new signaling pathway involving the presence of two immunoreceptor tyrosine-based inhibitory motifs (ITIM) in both orexin receptors subtypes, the recruitment of the phosphotyrosine phosphatase SHP2 and the induction of mitochondrial apoptosis has been elucidated. In the present review, we will discuss the anti-tumoral effect of orexin/OXR system in colon, pancreas, prostate and other cancers, and its interest as a possible therapeutic target.
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Mrázková J, Malinovská L, Wimmerová M. Step-By-Step In Vitro Mutagenesis: Lessons From Fucose-Binding Lectin PA-IIL. Methods Mol Biol 2017; 1498:399-419. [PMID: 27709592 DOI: 10.1007/978-1-4939-6472-7_28] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Site-directed mutagenesis is a powerful technique which is used to understand the basis of interactions between proteins and their binding partners, as well as to modify these interactions. Methods of rational design that are based on detailed knowledge of the structure of a protein of interest are often used for preliminary investigations of the possible outcomes which can result from the practical application of site-directed mutagenesis. Also, random mutagenesis can be used in tandem with site-directed mutagenesis for an examination of amino acid "hotspots."Lectins are sugar-binding proteins which, among other functions, mediate the recognition of host cells by a pathogen and its adhesion to the host cell surface. Hence, lectins and their binding properties are studied and engineered using site-directed mutagenesis.In this chapter, we describe a site-directed mutagenesis method used for investigating the sugar binding pattern of the PA-IIL lectin from the pathogenic bacterium Pseudomonas aeruginosa. Moreover, procedures for the production and purification of PA-IIL mutants are described, and several basic methods for characterizing the mutants are discussed.
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Affiliation(s)
- Jana Mrázková
- Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 267/2, 611 37, Brno, Czech Republic.,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kotlářská, 611 37, Brno, Czech Republic
| | - Lenka Malinovská
- Central European Institute of Technology, Masaryk University, Kamenice 753/5, 625 00, Brno, Czech Republic
| | - Michaela Wimmerová
- Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 267/2, 611 37, Brno, Czech Republic. .,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kotlářská, 611 37, Brno, Czech Republic. .,Central European Institute of Technology, Masaryk University, Kamenice 753/5, 625 00, Brno, Czech Republic.
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Blais A, Drouin G, Chaumontet C, Voisin T, Couvelard A, Even PC, Couvineau A. Impact of Orexin-A Treatment on Food Intake, Energy Metabolism and Body Weight in Mice. PLoS One 2017; 12:e0169908. [PMID: 28085909 PMCID: PMC5235373 DOI: 10.1371/journal.pone.0169908] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 12/22/2016] [Indexed: 02/05/2023] Open
Abstract
Orexin-A and -B are hypothalamic neuropeptides of 33 and 28-amino acids, which regulate many homeostatic systems including sleep/wakefulness states, energy balance, energy homeostasis, reward seeking and drug addiction. Orexin-A treatment was also shown to reduce tumor development in xenografted nude mice and is thus a potential treatment for carcinogenesis. The aim of this work was to explore in healthy mice the consequences on energy expenditure components of an orexin-A treatment at a dose previously shown to be efficient to reduce tumor development. Physiological approaches were used to evaluate the effect of orexin-A on food intake pattern, energy metabolism body weight and body adiposity. Modulation of the expression of brain neuropeptides and receptors including NPY, POMC, AgRP, cocaine- and amphetamine related transcript (CART), corticotropin-releasing hormone (CRH) and prepro-orexin (HCRT), and Y2 and Y5 neuropeptide Y, MC4 (melanocortin), OX1 and OX2 orexin receptors (Y2R, Y5R, MC4R, OX1R and OX2R, respectively) was also explored. Our results show that orexin-A treatment does not significantly affect the components of energy expenditure, and glucose metabolism but reduces intraperitoneal fat deposit, adiposity and the expression of several brain neuropeptide receptors suggesting that peripheral orexin-A was able to reach the central nervous system. These findings establish that orexin-A treatment which is known for its activity as an inducer of tumor cell death, do have minor parallel consequence on energy homeostasis control.
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Affiliation(s)
- Anne Blais
- UMR Physiologie de la Nutrition et du Comportement Alimentaire, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
- * E-mail:
| | - Gaëtan Drouin
- UMR Physiologie de la Nutrition et du Comportement Alimentaire, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
| | - Catherine Chaumontet
- UMR Physiologie de la Nutrition et du Comportement Alimentaire, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
| | - Thierry Voisin
- INSERM U1149/ Inflammation Research Center (CRI), Paris-Diderot University, DHU UNITY, Faculté de Médecine Site Bichat, 16, rue H. Huchard, Paris, France
| | - Anne Couvelard
- INSERM U1149/ Inflammation Research Center (CRI), Paris-Diderot University, DHU UNITY, Faculté de Médecine Site Bichat, 16, rue H. Huchard, Paris, France
| | - Patrick Christian Even
- UMR Physiologie de la Nutrition et du Comportement Alimentaire, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
| | - Alain Couvineau
- INSERM U1149/ Inflammation Research Center (CRI), Paris-Diderot University, DHU UNITY, Faculté de Médecine Site Bichat, 16, rue H. Huchard, Paris, France
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17
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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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