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Neveu C, Dulin F, Lefranc B, Galas L, Calbrix C, Bureau R, Rault S, Chuquet J, Boutin JA, Guilhaudis L, Ségalas-Milazzo I, Vaudry D, Vaudry H, Santos JSDO, Leprince J. Molecular basis of agonist docking in a human GPR103 homology model by site-directed mutagenesis and structure-activity relationship studies. Br J Pharmacol 2014; 171:4425-39. [PMID: 24913445 DOI: 10.1111/bph.12808] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Revised: 04/04/2014] [Accepted: 05/15/2014] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND AND PURPOSE The neuropeptide 26RFa and its cognate receptor GPR103 are involved in the control of food intake and bone mineralization. Here, we have tested, experimentally, the predicted ligand-receptor interactions by site-directed mutagenesis of GPR103 and designed point-substituted 26RFa analogues. EXPERIMENTAL APPROACH Using the X-ray structure of the β2 -adrenoceptor, a 3-D molecular model of GPR103 has been built. The bioactive C-terminal octapeptide 26RFa(19-26) , KGGFSFRF-NH2 , was docked in this GPR103 model and the ligand-receptor complex was submitted to energy minimization. KEY RESULTS In the most stable complex, the Phe-Arg-Phe-NH2 part was oriented inside the receptor cavity, whereas the N-terminal Lys residue remained outside. A strong intermolecular interaction was predicted between the Arg(25) residue of 26RFa and the Gln(125) residue located in the third transmembrane helix of GPR103. To confirm this interaction experimentally, we tested the ability of 26RFa and Arg-modified 26RFa analogues to activate the wild-type and the Q125A mutant receptors transiently expressed in CHO cells. 26RFa (10(-6) M) enhanced [Ca(2+) ]i in wild-type GPR103-transfected cells, but failed to increase [Ca(2+) ]i in Q125A mutant receptor-expressing cells. Moreover, asymmetric dimethylation of the side chain of arginine led to a 26RFa analogue, [ADMA(25) ]26RFa(20-26) , that was unable to activate the wild-type GPR103, but antagonized 26RFa-evoked [Ca(2+) ]i increase. CONCLUSION AND IMPLICATIONS Altogether, these data provide strong evidence for a functional interaction between the Arg(25) residue of 26RFa and the Gln(125) residue of GPR103 upon ligand-receptor activation, which can be exploited for the rational design of potent GPR103 agonists and antagonists.
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Affiliation(s)
- C Neveu
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Cell Differentiation and Communication, Neurotrophic Factors and Neuronal Differentiation Team, Institute for Research and Innovation in Biomedicine (IRIB); Cell Imaging Platform of Normandy (PRIMACEN), IRIB; Normandie Univ, France
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Gore AC, Balthazart J, Bikle D, Carpenter DO, Crews D, Czernichow P, Diamanti-Kandarakis E, Dores RM, Grattan D, Hof PR, Hollenberg AN, Lange C, Lee AV, Levine JE, Millar RP, Nelson RJ, Porta M, Poth M, Power DM, Prins GS, Ridgway EC, Rissman EF, Romijn JA, Sawchenko PE, Sly PD, Söder O, Taylor HS, Tena-Sempere M, Vaudry H, Wallen K, Wang Z, Wartofsky L, Watson CS. Policy decisions on endocrine disruptors should be based on science across disciplines: a response to Dietrich et al. Horm Res Paediatr 2014; 80:305-8. [PMID: 24107550 DOI: 10.1159/000355668] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- A C Gore
- Division of Pharmacology and Toxicology, The University of Texas, Austin, Tex., USA
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3
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Gore AC, Balthazart J, Bikle D, Carpenter DO, Crews D, Czernichow P, Diamanti-Kandarakis E, Dores RM, Grattan D, Hof PR, Hollenberg AN, Lange C, Lee AV, Levine JE, Millar RP, Nelson RJ, Porta M, Poth M, Power DM, Prins GS, Ridgway EC, Rissman EF, Romijn JA, Sawchenko PE, Sly PD, Söder O, Taylor HS, Tena-Sempere M, Vaudry H, Wallen K, Wang Z, Wartofsky L, Watson CS. Reprint of: policy decisions on endocrine disruptors should be based on science across disciplines: a response to Dietrich et al. Horm Behav 2014; 65:190-3. [PMID: 24289987 DOI: 10.1016/j.yhbeh.2013.09.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- A C Gore
- Division of Pharmacology and Toxicology, The University of Texas, Austin, TX 78712, USA.
| | - J Balthazart
- University of Liège, GIGA Neurosciences, B-4000 Liège, Belgium
| | - D Bikle
- VA Medical Center, University of California, San Francisco, San Francisco, CA 94143, USA
| | - D O Carpenter
- Institute for Health and the Environment, University at Albany, State University of New York, Albany, NY 12222, USA
| | - D Crews
- Section of Integrative Biology, The University of Texas, Austin, TX 78712, USA
| | | | | | - R M Dores
- Department of Biological Sciences, University of Denver, Denver, CO 80208, USA
| | - D Grattan
- Department of Anatomy, University of Otago, North Dunedin 9016, New Zealand
| | - P R Hof
- Icahn School of Medicine at Mt Sinai, New York, NY 10029, USA
| | - A N Hollenberg
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
| | - C Lange
- University of Minnesota Masonic Cancer Center, Minneapolis, MN 55455, USA
| | - A V Lee
- University of Pittsburgh Cancer Institute, Magee Women's Research Institute, Pittsburgh, PA 15213, USA
| | - J E Levine
- Wisconsin National Primate Research Center, Madison, WI 53715, USA
| | - R P Millar
- UCT/MRC Receptor Biology Unit, University of Cape Town, Cape Town, South Africa
| | - R J Nelson
- Department of Neuroscience, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
| | - M Porta
- Hospital del Mar Institute of Medical Research, School of Medicine, Universitat Autònoma de Barcelona, 080041 Barcelona, Spain
| | - M Poth
- Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA
| | - D M Power
- Department of Biosciences, Universidade do Algarve, 8005-139 Faro, Portugal
| | - G S Prins
- Department of Physiology and Biophysics, University of Illinois, Chicago, IL 60612, USA
| | - E C Ridgway
- Department of Medicine, University of Colorado School of Medicine, Denver, CO 80208, USA
| | - E F Rissman
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA
| | - J A Romijn
- Division of Medicine, Academic Medical Center, University of Amsterdam, 1012 WX Amsterdam, The Netherlands
| | - P E Sawchenko
- Laboratory of Neuronal Structure and Function, The Salk Institute, La Jolla, CA 92037, USA
| | - P D Sly
- Queensland Children's Medical Institute, University of Queensland, Royal Children's Hospital, Brisbane, Queensland 4000, Australia
| | - O Söder
- Karolinska Institutet at Karolinska University Hospital Solna, 171 76 Stockholm, Sweden
| | - H S Taylor
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale School of Medicine, New Haven, CT 06510, USA
| | - M Tena-Sempere
- Department of Cell Biology and Physiology, University of Córdoba, 14071 Córdoba, Spain
| | - H Vaudry
- Institut National de la Santé et de la Recherche Médicale U982, University of Rouen, 76821 Rouen, France
| | - K Wallen
- Department of Psychology, Yerkes National Primate Research Center, Emory University, Atlanta, GA 30322, USA
| | - Z Wang
- Department of Psychology and Neuroscience, Florida State University, Tallahassee, FL 32306, USA
| | - L Wartofsky
- Department of Medicine, Washington Hospital Center, Washington, DC 20010, USA
| | - C S Watson
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX 77555, USA
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4
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Gore AC, Balthazart J, Bikle D, Carpenter DO, Crews D, Czernichow P, Diamanti-Kandarakis E, Dores RM, Grattan D, Hof PR, Hollenberg AN, Lange C, Lee AV, Levine JE, Millar RP, Nelson RJ, Porta M, Poth M, Power DM, Prins GS, Ridgway EC, Rissman EF, Romijn JA, Sawchenko PE, Sly PD, Söder O, Taylor HS, Tena-Sempere M, Vaudry H, Wallen K, Wang Z, Wartofsky L, Watson CS. Reprint of: policy decisions on endocrine disruptors should be based on science across disciplines: a response to Dietrich, et al. Front Neuroendocrinol 2014; 35:2-5. [PMID: 24268499 DOI: 10.1016/j.yfrne.2013.09.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 09/17/2013] [Indexed: 11/24/2022]
Affiliation(s)
- A C Gore
- Pharmacology and Toxicology, The University of Texas at Austin, Austin, TX 78712, United States.
| | - J Balthazart
- University of Liège, GIGA Neurosciences, B-4000 Liège, Belgium
| | - D Bikle
- VA Medical Center and University of California, San Francisco, San Francisco, CA 94143, United States
| | - D O Carpenter
- Institute for Health and the Environment, University at Albany, State University of New York, Albany, NY 12222, United States
| | - D Crews
- Section of Integrative Biology, The University of Texas, Austin, TX 78712, United States
| | - P Czernichow
- Professor Emeritus of Pediatrics, University of Paris, 75006 Paris, France
| | | | - R M Dores
- Department of Biological Sciences, University of Denver, Denver, CO 80208, United States
| | - D Grattan
- Department of Anatomy, University of Otago, North Dunedin 9016, New Zealand
| | - P R Hof
- Icahn School of Medicine at Mt Sinai, New York, NY 10029, United States
| | | | - C Lange
- University of Minnesota Masonic Cancer Center, Minneapolis, MN 55455, United States
| | - A V Lee
- University of Pittsburgh Cancer Institute and Magee Women's Research Institute, Pittsburgh, PA 15213, United States
| | - J E Levine
- Wisconsin National Primate Research Center, Madison, WI 53715, United States
| | - R P Millar
- UCT/MRC Receptor Biology Unit, University of Cape Town, Cape Town, South Africa
| | - R J Nelson
- Department of Neuroscience, The Ohio State University Wexner Medical Center, Columbus, OH 43210, United States
| | - M Porta
- Hospital del Mar Institute of Medical Research and School of Medicine, Universitat Autònoma de Barcelona, 080041 Barcelona, Spain
| | - M Poth
- Uniformed Services University of the Health Sciences, Bethesda, MD 20814, United States
| | - D M Power
- Department of Biosciences, Universidade do Algarve, 8005-139 Faro, Portugal
| | - G S Prins
- Department of Physiology and Biophysics, University of Illinois, Chicago, IL 60612, United States
| | - E C Ridgway
- Department of Medicine, University of Colorado School of Medicine, Denver, CO 80208, United States
| | - E F Rissman
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Virginia, Charlottesville, VA 22908, United States
| | - J A Romijn
- Division of Medicine, Academic Medical Center, University of Amsterdam, 1012 WX Amsterdam, The Netherlands
| | - P E Sawchenko
- Laboratory of Neuronal Structure and Function, The Salk Institute, La Jolla, CA 92037, United States
| | - P D Sly
- Queensland Children's Medical Institute, University of Queensland, Royal Children's Hospital, Brisbane, Queensland 4000, Australia
| | - O Söder
- Karolinska Institutet at Karolinska University Hospital Solna, 171 76 Stockholm, Sweden
| | - H S Taylor
- Department of Obstetrics, Gynecology and Reproductive Sciences, Yale School of Medicine, New Haven, CT 06510, United States
| | - M Tena-Sempere
- Department of Cell Biology and Physiology, University of Córdoba, 14071 Córdoba, Spain
| | - H Vaudry
- Institut National de la Santé et de la Recherche Médicale U982, University of Rouen, 76821 Rouen, France
| | - K Wallen
- Department of Psychology and Yerkes National Primate Research Center, Emory University, Atlanta, GA 30322, United States
| | - Z Wang
- Department of Psychology and Neuroscience, Florida State University, Tallahassee, FL 32306, United States
| | - L Wartofsky
- Department of Medicine, Washington Hospital Center, Washington, DC 20010, United States
| | - C S Watson
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX 77555, United States
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5
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Abstract
The hypothalamus senses hormones and nutrients in order to regulate energy balance. In particular, detection of hypothalamic glucose levels has been shown to regulate both feeding behavior and peripheral glucose homeostasis, and impairment of this regulatory system is believed to be involved in the development of obesity and diabetes. Several data clearly demonstrate that glial cells are key elements in the perception of glucose, constituting with neurons a "glucose-sensing unit". Characterization of this interplay between glia and neurons represents an exciting challenge, and will undoubtedly contribute to identify new candidates for therapeutic intervention. The purpose of this review is to summarize the current data that stress the importance of glia in central glucose-sensing. The nature of the glia-to-neuron signaling is discussed, with a special focus on the endozepine ODN, a potent anorexigenic peptide that is highly expressed in hypothalamic glia.
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Affiliation(s)
- M C Tonon
- Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France
| | - D Lanfray
- Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France
| | - H Castel
- Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France
| | - H Vaudry
- Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France
| | - F Morin
- Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France
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Affiliation(s)
- M M Malagón
- Department of Cell Biology, Physiology, and Immunology, Instituto Maimonides de Investigacion Biomedica de Cordoba (IMIBIC)/Reina Sofia University Hospital/University of Cordoba, and CIBER Fisiopatologia de la Obesidad y Nutricion (CIBERobn), Instituto de Salud Carlos III, Córdoba, Spain
| | - H Vaudry
- Institut National de la Santé et de la Recherche Médicale (Inserm), Mont-Saint-Aignan, France
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7
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Gore AC, Balthazart J, Bikle D, Carpenter DO, Crews D, Czernichow P, Diamanti-Kandarakis E, Dores RM, Grattan D, Hof PR, Hollenberg AN, Lange C, Lee AV, Levine JE, Millar RP, Nelson RJ, Porta M, Poth M, Power DM, Prins GS, Ridgway EC, Rissman EF, Romijn JA, Sawchenko PE, Sly PD, Söder O, Taylor HS, Tena-Sempere M, Vaudry H, Wallen K, Wang Z, Wartofsky L, Watson CS. Policy decisions on endocrine disruptors should be based on science across disciplines: a response to Dietrich et al. Eur J Endocrinol 2013; 169:E1-4. [PMID: 24057478 DOI: 10.1530/eje-13-0763] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- A C Gore
- Division of Pharmacology and Toxicology, The University of Texas, Austin, Texas 78712, USA
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8
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Gore AC, Balthazart J, Bikle D, Carpenter DO, Crews D, Czernichow P, Diamanti-Kandarakis E, Dores RM, Grattan D, Hof PR, Hollenberg AN, Lange C, Lee AV, Levine JE, Millar RP, Nelson RJ, Porta M, Poth M, Power DM, Prins GS, Ridgway EC, Rissman EF, Romijn JA, Sawchenko PE, Sly PD, Söder O, Taylor HS, Tena-Sempere M, Vaudry H, Wallen K, Wang Z, Wartofsky L, Watson CS. Policy decisions on endocrine disruptors should be based on science across disciplines: a response to Dietrich et al. Endocrinology 2013; 154:3957-60. [PMID: 24048095 PMCID: PMC5398595 DOI: 10.1210/en.2013-1854] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- A C Gore
- PhD, Editor-in-Chief, Endocrinology, Gustavus, Louise Pfeiffer Professor of Pharmacology, Toxicology, The University of Texas at Austin, Austin, Texas 78712.
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9
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Gore AC, Balthazart J, Bikle D, Carpenter DO, Crews D, Czernichow P, Diamanti-Kandarakis E, Dores RM, Grattan D, Hof PR, Hollenberg AN, Lange C, Lee AV, Levine JE, Millar RP, Nelson RJ, Porta M, Poth M, Power DM, Prins GS, Ridgway EC, Rissman EF, Romijn JA, Sawchenko PE, Sly PD, Söder O, Taylor HS, Tena-Sempere M, Vaudry H, Wallen K, Wang Z, Wartofsky L, Watson CS. Policy decisions on endocrine disruptors should be based on science across disciplines: a response to Dietrichet al. Andrology 2013; 1:802-5. [DOI: 10.1111/j.2047-2927.2013.00151.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- A. C. Gore
- Division of Pharmacology and Toxicology; The University of Texas; Austin TX USA
| | - J. Balthazart
- University of Liège; GIGA Neurosciences; Liège Belgium
| | - D. Bikle
- VA Medical Center and University of California, San Francisco; San Francisco CA USA
| | - D. O. Carpenter
- Institute for Health and the Environment; University at Albany; State University of New York; Albany NY USA
| | - D. Crews
- Section of Integrative Biology; The University of Texas; Austin TX USA
| | | | | | - R. M. Dores
- Department of Biological Sciences; University of Denver; Denver CO USA
| | - D. Grattan
- Department of Anatomy; University of Otago; North Dunedin New Zealand
| | - P. R. Hof
- Icahn School of Medicine at Mt Sinai; New York NY USA
| | - A. N. Hollenberg
- Beth Israel Deaconess Medical Center; Harvard Medical School; Boston MA USA
| | - C. Lange
- University of Minnesota Masonic Cancer Center; Minneapolis MN USA
| | - A. V. Lee
- University of Pittsburgh Cancer Institute and Magee Women's Research Institute; Pittsburgh PA USA
| | - J. E. Levine
- Wisconsin National Primate Research Center; Madison WI USA
| | - R. P. Millar
- UCT/MRC Receptor Biology Unit; University of Cape Town; Cape Town South Africa
| | - R. J. Nelson
- Department of Neuroscience; The Ohio State University Wexner Medical Center; Columbus OH USA
| | - M. Porta
- Hospital del Mar Institute of Medical Research and School of Medicine; Universitat Autònoma de Barcelona; Barcelona Spain
| | - M. Poth
- Uniformed Services University of the Health Sciences; Bethesda MD USA
| | - D. M. Power
- Department of Biosciences; Universidade do Algarve; Faro Portugal
| | - G. S. Prins
- Department of Physiology and Biophysics; University of Illinois; Chicago IL USA
| | - E. C. Ridgway
- Department of Medicine; University of Colorado School of Medicine; Denver CO USA
| | - E. F. Rissman
- Department of Biochemistry and Molecular Genetics; School of Medicine; University of Virginia; Charlottesville VA USA
| | - J. A. Romijn
- Division of Medicine; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
| | - P. E. Sawchenko
- Laboratory of Neuronal Structure and Function; The Salk Institute; La Jolla CA USA
| | - P. D. Sly
- Queensland Children's Medical Institute; University of Queensland; Royal Children's Hospital; Brisbane Qld Australia
| | - O. Söder
- Karolinska Institutet at Karolinska University Hospital Solna; Stockholm Sweden
| | - H. S. Taylor
- Department of Obstetrics, Gynecology and Reproductive Sciences; Yale School of Medicine; New Haven CT USA
| | - M. Tena-Sempere
- Department of Cell Biology and Physiology; University of Córdoba; Córdoba Spain
| | - H. Vaudry
- Institut National de la Santé et de la Recherche Médicale U982; University of Rouen; Rouen France
| | - K. Wallen
- Department of Psychology and Yerkes National Primate Research Center; Emory University; Atlanta GA USA
| | - Z. Wang
- Department of Psychology and Neuroscience; Florida State University; Tallahassee FL USA
| | - L. Wartofsky
- Department of Medicine; Washington Hospital Center; Washington DC USA
| | - C. S. Watson
- Department of Biochemistry and Molecular Biology; University of Texas Medical Branch; Galveston TX USA
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Azuma M, Wada K, Leprince J, Tonon MC, Uchiyama M, Takahashi A, Vaudry H, Matsuda K. The octadecaneuropeptide stimulates somatolactin release from cultured goldfish pituitary cells. J Neuroendocrinol 2013; 25:312-21. [PMID: 23163696 DOI: 10.1111/jne.12005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 10/24/2012] [Accepted: 11/10/2012] [Indexed: 11/30/2022]
Abstract
The present study aimed to investigate the distribution of the octadecaneuropeptide (ODN) in the goldfish brain and to look for a possible effect of ODN on somatolactin (SL) release from pituitary cells. A discrete population of ODN-immunoreactive neurones was localised in the lateral part of the nucleus lateralis tuberis. These neurones sent projections through the neurohypophyseal tract towards the neurohypophysis, and nerve fibres were seen in the close vicinity of SL-producing cells in the pars intermedia. Incubation of cultured goldfish pituitary cells with graded concentrations of ODN (10(-9) -10(-5 ) m) induced a dose-dependent stimulation of SL-β, but not SL-α, release. ODN-evoked SL release was blocked by the metabotrophic endozepine receptor antagonist cyclo(1-8) [DLeu(5) ]OP but was not affected by the central-type benzodiazepine receptor antagonist flumazenil. ODN-induced SL release was suppressed by treatment with the phospholipase C (PLC) inhibitor U-73122 but not with the protein kinase A (PKA) inhibitor H-89. These results indicate that, in fish, ODN produced by hypothalamic neurones acts as a hypophysiotrophic neuropeptide stimulating SL release. The effect of ODN is mediated through a metabotrophic endozepine receptor positively coupled to the PLC/inositol 1,4,5-trisphosphate/protein kinase C-signalling pathway.
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Affiliation(s)
- M Azuma
- Laboratory of Regulatory Biology, Graduate School of Science and Engineering, University of Toyama, Toyama, Japan
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11
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Andersen AC, Danger JM, Netitaïlo P, Pelletier G, Cantin M, Eberlé AN, Vaudry H. Localisation immunohistochimique de 3 neuropeptides (NPY ANF MCH) dans le complexe neurointermédiaire de l'hypophyse de grenouille. ACTA ACUST UNITED AC 2013. [DOI: 10.4267/10608/3681] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Vaudry H, Anouar Y, Galas L, Tonon MC, Chartrel N, Llorens Cortes C. La ghréline, un nouveau neuropeptide stimulant la sécrétion de l'hormone de croissance. ACTA ACUST UNITED AC 2012. [DOI: 10.4267/10608/1690] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Tostivint H, Lihrmann I, Bucharles C, Vieau D, Coulouarn Y, Fournier A, Conlon JM, Vaudry H, Dournaud P, Gardette R, Viollet C, Epelbaum J. Un deuxième gène codant pour la somatostatine est exprimé dans le cerveau. ACTA ACUST UNITED AC 2012. [DOI: 10.4267/10608/635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chafai M, Basille M, Galas L, Rostene W, Gressens P, Vaudry H, Gonzalez B, Louiset E. Pituitary adenylate cyclase-activating polypeptide and vasoactive intestinal polypeptide promote the genesis of calcium currents in differentiating mouse embryonic stem cells. Neuroscience 2011; 199:103-15. [DOI: 10.1016/j.neuroscience.2011.09.062] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Revised: 08/28/2011] [Accepted: 09/26/2011] [Indexed: 01/11/2023]
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15
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Bourgault S, Chatenet D, Wurtz O, Doan ND, Leprince J, Vaudry H, Fournier A, Vaudry D. Strategies to convert PACAP from a hypophysiotropic neurohormone into a neuroprotective drug. Curr Pharm Des 2011; 17:1002-24. [PMID: 21524253 DOI: 10.2174/138161211795589337] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Accepted: 03/16/2011] [Indexed: 11/22/2022]
Abstract
In neurological insults, such as cerebral ischemia and traumatic brain injury, complex molecular mechanisms involving inflammation and apoptosis are known to cause severe neuronal cell loss, emphasizing the necessity of developing therapeutic strategies targeting simultaneously these two processes. Over the last decade, numerous in vitro and in vivo studies have demonstrated the unique therapeutical potential of pituitary adenylate cyclase-activating polypeptide (PACAP) for the treatment of neuronal disorders involving apoptotic cell death and neuroinflammation. The neuroprotective activity of PACAP is based on its capacity to reduce the production of deleterious cytokines from activated microglia, to stimulate the release of neuroprotective agents from astrocytes and to inhibit pro-apoptotic intracellular pathways. However, the use of PACAP as a clinically applicable drug is hindered by its peptidic nature. As most natural peptides, native PACAP shows poor metabolic stability, low bioavailability, inadequate distribution and rapid blood clearance. Moreover, injection of PACAP to human can induce peripheral adverse side effects. Therefore, targeted chemical modifications and/or conjugation of PACAP to different macromolecules are required to improve the pharmacokinetic and pharmacological properties of PACAP. This review presents the chemical, biochemical and pharmacological strategies that are currently under development to convert PACAP from a hypophysiotropic neurohormone into a clinically relevant neuroprotective drug.
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Affiliation(s)
- S Bourgault
- Institut Armand-Frappier, Institut National de la Recherche Scientifique, 531 boul. des Prairies, Ville de Laval, Qc, H7V1B7, Canada
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16
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Pasquier J, Lafont AG, Leprince J, Vaudry H, Rousseau K, Dufour S. First evidence for a direct inhibitory effect of kisspeptins on LH expression in the eel, Anguilla anguilla. Gen Comp Endocrinol 2011; 173:216-25. [PMID: 21679713 DOI: 10.1016/j.ygcen.2011.05.019] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Revised: 05/24/2011] [Accepted: 05/26/2011] [Indexed: 11/29/2022]
Abstract
The kisspeptin system has emerged as one of the main puberty gatekeepers among vertebrates. The European eel (Anguilla anguilla) is a remarkable model due to its phylogenetical position at the basis of teleosts, and its unique life cycle with a blockade of puberty before reproductive migration. We cloned the full-length coding sequence of a kisspeptin receptor (Kissr) in the eel. Comparison of Kissr sequences assigned the eel Kissr to a basal position in a clade including most of the known teleost Kissr, in agreement with the eel phylogenetical position. Eel Kissr tissue distribution was analyzed by quantitative real-time PCR. Eel Kissr was highly expressed in the brain, especially in the telencephalon and di-/mes-encephalon, while a very low or undetectable expression was observed in various peripheral organs. A high expression of Kissr was also found in the pituitary indicating a possible direct pituitary role of kisspeptin. Primary cultures of eel pituitary cells were performed to investigate the direct effects of kisspeptin on pituitary hormone expression. Human/lamprey kisspeptin exerted a time- and dose-dependent inhibitory effect on LHβ expression. All other tested kisspeptins had a similar inhibitory effect on LHβ expression. The inhibitory effect of kisspeptins was exerted specifically on LHβ as no change was induced on the expression of other glycoprotein hormone subunits (GPα, FSHβ and TSHβ) nor of growth hormone. These data provide the first evidence for the existence, in the European eel, of a kisspeptin system, which may play a direct inhibitory role on pituitary LHβ expression.
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Affiliation(s)
- J Pasquier
- Laboratory of Biology of Aquatic Organisms and Ecosystems (BOREA), UMR CNRS 7208-IRD207-UPMC, Muséum National d'Histoire Naturelle, 7 rue Cuvier, CP32, 75231 Paris Cedex 05, France
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17
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Matsuda K, Wada K, Azuma M, Leprince J, Tonon M, Sakashita A, Maruyama K, Uchiyama M, Vaudry H. The octadecaneuropeptide exerts an anxiogenic-like action in goldfish. Neuroscience 2011; 181:100-8. [DOI: 10.1016/j.neuroscience.2011.02.058] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Revised: 02/25/2011] [Accepted: 02/25/2011] [Indexed: 11/26/2022]
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18
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Bruzzone F, Cervetto C, Mazzotta M, Bianchini P, Ronzitti E, Leprince J, Diaspro A, Maura G, Vallarino M, Vaudry H, Marcoli M. Urotensin II receptor and acetylcholine release from mouse cervical spinal cord nerve terminals. Neuroscience 2010; 170:67-77. [DOI: 10.1016/j.neuroscience.2010.06.070] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Revised: 06/16/2010] [Accepted: 06/25/2010] [Indexed: 01/30/2023]
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19
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Tsutsui K, Bentley GE, Kriegsfeld LJ, Osugi T, Seong JY, Vaudry H. Discovery and evolutionary history of gonadotrophin-inhibitory hormone and kisspeptin: new key neuropeptides controlling reproduction. J Neuroendocrinol 2010; 22:716-27. [PMID: 20456604 PMCID: PMC2909878 DOI: 10.1111/j.1365-2826.2010.02018.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Gonadotrophin-releasing hormone (GnRH) is the primary hypothalamic factor responsible for the control of gonadotrophin secretion in vertebrates. However, within the last decade, two other hypothalamic neuropeptides have been found to play key roles in the control of reproductive functions: gonadotrophin-inhibitory hormone (GnIH) and kisspeptin. In 2000, we discovered GnIH in the quail hypothalamus. GnIH inhibits gonadotrophin synthesis and release in birds through actions on GnRH neurones and gonadotrophs, mediated via GPR147. Subsequently, GnIH orthologues were identified in other vertebrate species from fish to humans. As in birds, mammalian and fish GnIH orthologues inhibit gonadotrophin release, indicating a conserved role for this neuropeptide in the control of the hypothalamic-pituitary-gonadal axis across species. Subsequent to the discovery of GnIH, kisspeptin, encoded by the KiSS-1 gene, was discovered in mammals. By contrast to GnIH, kisspeptin has a direct stimulatory effect on GnRH neurones via GPR54. GPR54 is also expressed in pituitary cells, but whether gonadotrophs are targets for kisspeptin remains unresolved. The KiSS-1 gene is also highly conserved and has been identified in mammals, amphibians and fish. We have recently found a second isoform of KiSS-1, designated KiSS-2, in several vertebrates, but not birds, rodents or primates. In this review, we highlight the discovery, mechanisms of action, and functional significance of these two chief regulators of the reproductive axis.
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Affiliation(s)
- K Tsutsui
- Department of Biology, Waseda University, Tokyo, Japan.
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20
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Compère V, Lanfray D, Castel H, Morin F, Leprince J, Dureuil B, Vaudry H, Pelletier G, Tonon MC. Acute food deprivation reduces expression of diazepam-binding inhibitor, the precursor of the anorexigenic octadecaneuropeptide ODN, in mouse glial cells. J Mol Endocrinol 2010; 44:295-9. [PMID: 20219854 DOI: 10.1677/jme-09-0176] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In the central nervous system of mammals, the gene encoding diazepam-binding inhibitor (DBI) is exclusively expressed in glial cells. Previous studies have shown that central administration of a DBI processing product, the octadecaneuropeptide ODN, causes a marked inhibition of food consumption in rodents. Paradoxically, however, the effect of food restriction on DBI gene expression has never been investigated. Here, we show that in mice, acute fasting dramatically reduces DBI mRNA levels in the hypothalamus and the ependyma bordering the third and lateral ventricles. I.p. injection of insulin, but not of leptin, selectively stimulated DBI expression in the lateral ventricle area. These data support the notion that glial cells, through the production of endozepines, may relay peripheral signals to neurons involved in the central regulation of energy homeostasis.
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Affiliation(s)
- V Compère
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Communication and Differentiation University of Rouen, European Institute for Peptide Research (IFRMP 23), Regional Platform for Cell Imaging of Normandy, University of Rouen, 76821 Mont-Saint-Aignan, France
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21
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Agirregoitia N, Bizet P, Agirregoitia E, Boutelet I, Peralta L, Vaudry H, Jégou S. Prolyl endopeptidase mRNA expression in the central nervous system during rat development. J Chem Neuroanat 2010; 40:53-62. [PMID: 20304043 DOI: 10.1016/j.jchemneu.2010.03.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Revised: 03/09/2010] [Accepted: 03/09/2010] [Indexed: 12/01/2022]
Abstract
Prolyl endopeptidase (PEP) is a serine protease that cleaves small peptides at the carboxyl side of L-proline. PEP has been reported to have important functions in the brain being implicated in learning and memory processes, psychological disorders and neurodegenerative diseases. Several PEP substrates have been shown to play a role during brain development and this observation led us to investigate the expression of PEP mRNA in the rat brain and spinal cord, from embryo to adult stages. In situ hybridization revealed that PEP mRNA is expressed early, from embryonic day 15, notably in germinative areas including the neocortical, hippocampal, pallidal, thalamic, anterior hypothalamic, tectal, cerebellar, pontine and medullary neuroepithelia. PEP mRNA was also found in the differentiating fields of the olfactory bulb, the orbital and cingulate cortex, the hippocampal formation, the cortical plate and the subventricular zone of the cortex. Quantitative RT-PCR analysis in various brain areas and the spinal cord showed that PEP mRNA levels are more abundant during the perinatal stages, coinciding with a period of neuronal migration and differentiation. From then on, PEP mRNA expression decreased, reaching its lowest levels at adulthood. Overall, the present data support the possibility that PEP exerts specific functions related to neurodevelopment besides those proposed to date.
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Affiliation(s)
- N Agirregoitia
- INSERM U413/U982, Laboratory of Cellular and Molecular Neuroendocrinology, European Institute for Peptide Research (IFRMP 23), University of Rouen, 76821 Mont-Saint-Aignan, France.
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22
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Bourgault S, Vaudry D, Dejda A, Doan N, Vaudry H, Fournier A. Pituitary Adenylate Cyclase-Activating Polypeptide: Focus on Structure- Activity Relationships of a Neuroprotective Peptide. Curr Med Chem 2009; 16:4462-80. [DOI: 10.2174/092986709789712899] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2009] [Accepted: 09/21/2009] [Indexed: 11/22/2022]
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23
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Chu JYS, Lee LTO, Lai CH, Vaudry H, Chan YS, Yung WH, Chow BKC. Secretin as a neurohypophysial factor regulating body water homeostasis. Proc Natl Acad Sci U S A 2009; 106:15961-6. [PMID: 19805236 PMCID: PMC2747226 DOI: 10.1073/pnas.0903695106] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2009] [Indexed: 12/23/2022] Open
Abstract
Hypothalamic magnocellular neurons express either one of the neurohypophysial hormones, vasopressin or oxytocin, along with different neuropeptides or neuromodulators. Axonal terminals of these neurons are generally accepted to release solely the two hormones but not others into the circulation. Here, we show that secretin, originally isolated from upper intestinal mucosal extract, is present throughout the hypothalamo-neurohypophysial axis and that it is released from the posterior pituitary under plasma hyperosmolality conditions. In the hypothalamus, it stimulates vasopressin expression and release. Considering these findings together with our previous findings that show a direct effect of secretin on renal water reabsorption, we propose here that secretin works at multiple levels in the hypothalamus, pituitary, and kidney to regulate water homeostasis. Findings presented here challenge previous understanding regarding the neurohypophysis and could provide new concepts in treating disorders related to osmoregulation.
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Affiliation(s)
| | | | - C. H. Lai
- Department of Physiology and Research Centre of Heart, Brain, Hormone and Healthy Aging, University of Hong Kong, Hong Kong, China
| | - H. Vaudry
- Institut National de la Santé et de la Recherche Médicale Unité 413, Laboratory of Cellular and Molecular Neuroendocrinology, University of Rouen, 76821 Mont-Saint-Aignan, France; and
| | - Y. S. Chan
- Department of Physiology and Research Centre of Heart, Brain, Hormone and Healthy Aging, University of Hong Kong, Hong Kong, China
| | - W. H. Yung
- Department of Physiology, Chinese University of Hong Kong, Hong Kong, China
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Jolivel V, Basille M, Aubert N, de Jouffrey S, Ancian P, Le Bigot JF, Noack P, Massonneau M, Fournier A, Vaudry H, Gonzalez BJ, Vaudry D. Distribution and functional characterization of pituitary adenylate cyclase-activating polypeptide receptors in the brain of non-human primates. Neuroscience 2009; 160:434-51. [PMID: 19236905 DOI: 10.1016/j.neuroscience.2009.02.028] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2009] [Revised: 02/09/2009] [Accepted: 02/12/2009] [Indexed: 01/04/2023]
Abstract
The distribution and density of pituitary adenylate cyclase-activating polypeptide (PACAP) binding sites have been investigated in the brain of the primates Jacchus callithrix (marmoset) and Macaca fascicularis (macaque) using [(125)I]-PACAP27 as a radioligand. PACAP binding sites were widely expressed in the brain of these two species with particularly high densities in the septum, hypothalamus and habenula. A moderate density of recognition sites was seen in all subdivisions of the cerebral cortex with a heterogenous distribution, the highest concentrations occurring in layers I and VI while the underlying white matter was almost devoid of binding sites. Reverse transcriptase-polymerase chain reaction (RT-PCR) analysis revealed intense expression of the mRNAs encoding the short and hop-1 variants of pituitary adenylate cyclase-activating polypeptide-specific receptor (PAC1-R) in the cortex of both marmoset and macaque, whereas vasoactive intestinal polypeptide/pituitary adenylate cyclase-activating polypeptide mutual receptor, subtype 1 (VPAC1-R) and vasoactive intestinal polypeptide/pituitary adenylate cyclase-activating polypeptide mutual receptor, subtype 2 (VPAC2-R) mRNAs were expressed at a much lower level. In situ hybridization histochemistry showed intense expression of PAC1-R and weak expression of VPAC1-R mRNAs in layer IV of the cerebral cortex. Incubation of cortical tissue slices with PACAP induced a dose-dependent stimulation of cyclic AMP formation, indicating that PACAP binding sites correspond to functional receptors. Moreover, treatment of primate cortical slices with 100 nM PACAP significantly reduced the activity of caspase-3, a key enzyme of the apoptotic cascade. The present results indicate that PACAP should exert the same neuroprotective effect in the brain of primates as in rodents and suggest that PAC1-R agonists may have a therapeutic value to prevent neuronal cell death after stroke or in specific neurodegenerative diseases.
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Affiliation(s)
- V Jolivel
- Institut National de la Santé et de la Recherche Médicale (U413), EA 4310, Neuronal and Neuroendocrine Differentiation and Communication, European Institute for Peptide Research (IFRMP23), University of Rouen, 76821 Mont-Saint-Aignan, France
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Molendi-Coste O, Mairesse J, Aubert N, Ghzili H, Abbadie C, Vaudry H, Gonzalez B, Anouar Y, Vieau D, Breton C, Laborie C. Maternal perinatal undernutrition impairs chromaffin cells proliferation in the postnatal rat. Horm Metab Res 2008; 40:386-90. [PMID: 18401834 DOI: 10.1055/s-2008-1058091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Numerous data show that malnutrition during early life programs chronic diseases in adulthood. Many of these disorders may result from alterations in the development of neuroendocrine systems, such as the hypothalamo-pituitary-adrenal axis and the sympathoadrenal system. We have previously reported that maternal 50% food restriction during late pregnancy and lactation reduces adrenal weight and impairs chromaffin cell differentiation in male rats at weaning. In addition, maternal undernutrition modifies the expression of several genes involved in proliferation and apoptosis. This study therefore investigated the impact of maternal food restriction on adrenal cell growth in the late postnatal rat. Histological analysis showed that the number of proliferating chromaffin cells assessed by nuclear labelling with BrdU was reduced by 45%, whereas the level of apoptosis visualised by caspase-3 immunoreactivity was increased by 340% in adrenal medulla of offspring from undernourished mothers. In contrast, maternal food restriction did not affect proliferation and apoptosis in cortical cells of rats. These developmental changes were associated with overexpression of TGFbeta2. These data show that perinatal undernutrition impairs the balance between chromaffin cell proliferation and apoptosis. These modifications may lead to "malprogramming" of adrenal medulla development, which could contribute to the pathogenesis of chronic diseases in adulthood.
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Affiliation(s)
- O Molendi-Coste
- Unité de Neurosciences et Physiologie Adaptatives UPRES-EA 4052, Equipe dénutritions maternelles périnatales, Université Lille 1, Villeneuve d'Ascq Cedex, France
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26
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Zhokhov SS, Desfeux A, Aubert N, Falluel-Morel A, Fournier A, Laudenbach V, Vaudry H, Gonzalez BJ. Bax siRNA promotes survival of cultured and allografted granule cell precursors through blockade of caspase-3 cleavage. Cell Death Differ 2008; 15:1042-53. [DOI: 10.1038/cdd.2008.29] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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27
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Houari A, Picard J, Habarou H, Galas L, Vaudry H, Heim V, Di Martino P. Rheology of biofilms formed at the surface of NF membranes in a drinking water production unit. Biofouling 2008; 24:235-40. [PMID: 18392991 DOI: 10.1080/08927010802023764] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In this study, the mechanical properties of biofilms formed at the surface of nano-filtration (NF) membranes from a drinking water plant were analysed. Confocal laser scanning microscopy observations revealed that the NF biofilms formed a dense and heterogeneous structure at the membrane surface, with a mean thickness of 32.5 +/- 17.7 mum. The biofilms were scraped from the membrane surface and analysed in rotation and oscillation experiments with a RheoStress 150 rotating disk rheometer. During rotation analyses, a viscosity decrease with speed of shearing characteristic of rheofluidification was observed (eta = 300 Pa s for ý = 0.3 s(-1)). In the oscillation analyses with a sweeping of frequency (1-100 Hz), elasticity (G') ranged from 3000 to 3500 Pa and viscosity (G'') from 800 to 1200 Pa. Creep curves obtained with an application of a shear stress of 30 Pa were viscoelastic in nature. The G(0) and eta values were, respectively, 1.4 +/- 0.3 x 10(3) Pa and 3.3 +/- 0.65 x 10(6) Pa s. The relationship between the characteristics of NF biofilms and the flow conditions encountered during NF is discussed.
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Affiliation(s)
- A Houari
- Laboratoire ERRMECe (EA1391), université de Cergy-Pontoise, Pontoise, France
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28
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Matsuda K, Wada K, Miura T, Maruyama K, Shimakura S, Uchiyama M, Leprince J, Tonon M, Vaudry H. Effect of the diazepam-binding inhibitor-derived peptide, octadecaneuropeptide, on food intake in goldfish. Neuroscience 2007; 150:425-32. [DOI: 10.1016/j.neuroscience.2007.09.012] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2007] [Revised: 09/02/2007] [Accepted: 09/11/2007] [Indexed: 10/22/2022]
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29
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Deniel N, Thébault S, Lecleire S, Charlionet R, Coëf-fier M, Tron F, Galland A, Vaudry H, Déchelotte P. P011 Étude comparative des effets pharmaconutritionnels de la glutamine seule ou associée à des antioxydants sur le protéome duodénal humain. NUTR CLIN METAB 2007. [DOI: 10.1016/s0985-0562(07)78813-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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30
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Leroux P, Bodenant C, Bologna E, Gonzalez B, Vaudry H. Transient expression of somatostatin receptors in the brain during development. Ciba Found Symp 2007; 190:127-37; discussion 137-41. [PMID: 7587643 DOI: 10.1002/9780470514733.ch8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The study of somatostatin receptors by means of autoradiography in tissue sections revealed high densities of binding sites in the immature central nervous system. In rat cerebral cortex, the receptors are present in the intermediate zone and in association with cells migrating through the cortical plate. Somatostatin receptors in the intermediate zone of fetuses and in the cortical plate of postnatal rats exhibit high and low affinities respectively for the somatostatin analogue MK 678. In the rat cerebellum, the external granule cell layer, a germinal matrix containing interneuron precursors, contains a high density of receptors. These receptors exhibit high affinity for MK 678 throughout the period of cell multiplication. In granule cell cultures from eight-day-old rats, MK 678, octreotide and somatostatin are able to inhibit cAMP formation induced by forskolin or pituitary adenylyl cyclase-activating polypeptide. Somatostatin reduces the intracellular Ca2+ concentration in cultured granule cells; this response desensitizes rapidly. These results suggest that the somatostatin receptors in the external granule cell layer are type 2 receptors (sstr2). A low density of receptors with low affinity for MK 678 was also detected in the external granule cell layer and in the granule cell layer of neonatal rats. In adult rats the cerebellum is devoid of somatostatin receptors. These observations indicate that somatostatin probably exerts morphogenetic activities through different receptor types in several structures of the central nervous system.
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Affiliation(s)
- P Leroux
- Laboratoire d'Endocrinologie Moleculaire, INSERM U 413, UA CNRS, Université de Rouen, Mont-Saint-Aignan, France
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31
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Gourcerol G, Gallas S, Mounien L, Leblanc I, Bizet P, Boutelet I, Leroi AM, Ducrotte P, Vaudry H, Jegou S. Gastric electrical stimulation modulates hypothalamic corticotropin-releasing factor-producing neurons during post-operative ileus in rat. Neuroscience 2007; 148:775-81. [PMID: 17693031 DOI: 10.1016/j.neuroscience.2007.07.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2007] [Revised: 06/05/2007] [Accepted: 07/13/2007] [Indexed: 01/15/2023]
Abstract
High-frequency/low-energy gastric electrical stimulation (GES) is an efficient therapy to treat gastric emptying-related disorders but its mechanism of action remains poorly understood. We aimed to assess the effects of high-frequency/low-energy GES on corticotropin-releasing factor (CRF)-producing neurons in the paraventricular nucleus of the hypothalamus (PVN), which are involved in gastric ileus induced by laparotomy. Two electrodes were implanted in the rat gastric antrum during laparotomy, then stimulation (amplitude: 2 mA; pulse duration 330 micros; frequency: 2 Hz; 1 min ON/2 min OFF) or sham stimulation (control group) were applied. Using immunohistochemistry, the number of c-Fos protein-expressing neurons (c-Fos protein-immunoreactive cells, Fos-IR) was quantified in the PVN after 1 h of stimulation. The number of neurons expressing simultaneously c-Fos protein and CRF mRNA was measured by means of immunocytochemistry combined with in situ hybridization. Finally, c-Fos and CRF mRNA levels in the hypothalamus were determined by in situ hybridization or quantitative reverse transcriptase-polymerase chain reaction. Fos-IR in the PVN was significantly decreased 1 h after GES (P<0.05) but was not affected by sub-diaphragmatic vagotomy. The number of neurons containing c-Fos protein and CRF mRNA was lower in the GES group compared with the control group (P<0.05). In addition, c-Fos and CRF mRNA levels in the PVN were significantly decreased by GES (P<or=0.05). It is concluded that acute GES reduces the number of CRF-producing neurons and decreases CRF expression in the PVN during post-operative gastric ileus.
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Affiliation(s)
- G Gourcerol
- INSERM U413, Laboratory of Cellular and Molecular Neuroendocrinology, University of Rouen, Mont-Saint-Aignan, France
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32
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Cruz-Garcia D, Vazquez-Martinez R, Peinado JR, Anouar Y, Tonon MC, Vaudry H, Castaño JP, Malagon MM. Identification and characterization of two novel (neuro)endocrine long coiled-coil proteins. FEBS Lett 2007; 581:3149-56. [PMID: 17572408 DOI: 10.1016/j.febslet.2007.06.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2007] [Revised: 05/25/2007] [Accepted: 06/05/2007] [Indexed: 11/17/2022]
Abstract
We have identified a novel vertebrate-specific gene by applying a Differential Display method on two distinct subtypes of pituitary melanotropes showing divergent secretory phenotypes of hypo- and hypersecretion. A paralogue of this gene was also identified. The existence of a long coiled-coil domain and a C-terminal transmembrane domain in the sequences, together with the Golgi distribution of the proteins in transfected cells, suggest that they can be considered as new members of the golgin family of proteins. Both genes were primarily expressed in (neuro)endocrine tissues in vertebrates thus supporting a role for these proteins in the regulated secretory pathway.
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Affiliation(s)
- D Cruz-Garcia
- Department of Cell Biology, Physiology and Immunology, University of Cordoba, Cordoba, Spain
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Falluel-Morel A, Chafai M, Vaudry D, Basille M, Cazillis M, Aubert N, Louiset E, de Jouffrey S, Le Bigot JF, Fournier A, Gressens P, Rostène W, Vaudry H, Gonzalez BJ. The neuropeptide pituitary adenylate cyclase-activating polypeptide exerts anti-apoptotic and differentiating effects during neurogenesis: focus on cerebellar granule neurones and embryonic stem cells. J Neuroendocrinol 2007; 19:321-7. [PMID: 17425606 DOI: 10.1111/j.1365-2826.2007.01537.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Pituitary adenylate cyclase-activating polypeptide (PACAP) was originally isolated from ovine hypothalamus on the basis of its hypophysiotrophic activity. It has subsequently been shown that PACAP and its receptors are widely distributed in the central nervous system of adult mammals, indicating that PACAP may act as a neurotransmitter and/or neuromodulator. It has also been found that PACAP and its receptors are expressed in germinative neuroepithelia, suggesting that PACAP could be involved in neurogenesis. There is now compelling evidence that PACAP exerts neurotrophic activities in the developing cerebellum and in embryonic stem (ES) cells. In particular, the presence of PACAP receptors has been demonstrated in the granule layer of the immature cerebellar cortex, and PACAP has been shown to promote survival, inhibit migration and activate neurite outgrowth of granule cell precursors. In cerebellar neuroblasts, PACAP is a potent inhibitor of the mitochondrial apoptotic pathway through activation of the MAPkinase extracellular regulated kinase. ES cells and embryoid bodies (EB) also express PACAP receptors and PACAP facilitates neuronal orientation and induces the appearance of an electrophysiological activity. Taken together, the anti-apoptotic and pro-differentiating effects of PACAP characterised in cerebellar neuroblasts as well as ES and EB cells indicate that PACAP acts not only as a neurohormone and a neurotransmitter, but also as a growth factor.
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Affiliation(s)
- A Falluel-Morel
- INSERM U413, Laboratory of Cellular and Molecular Neuroendocrinology, European Institute for Peptide Research (IFRMP 23), University of Rouen, Mont-Saint-Aignan, France
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34
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Ait‐Ali D, Turquier V, Grumolato L, Yon L, Mounien L, Jegou S, Derambure C, Salier JP, Eiden LE, Vaudry H, Anouar Y. TNF‐α signaling through NF‐κB in chromaffin cells‐identification of novel targets with suppression subtractive hybridization study. FASEB J 2007. [DOI: 10.1096/fasebj.21.5.a287-d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | - L Yon
- IFRMP 23, INSERM U413, UnivRouenFrance
| | - L Mounien
- IFRMP 23, INSERM U413, UnivRouenFrance
| | - S Jegou
- IFRMP 23, INSERM U413, UnivRouenFrance
| | - C Derambure
- IFRMP 23INSERM U519, Fac. Med. PharmacyRouenFrance
| | - JP Salier
- IFRMP 23INSERM U519, Fac. Med. PharmacyRouenFrance
| | | | - H Vaudry
- IFRMP 23, INSERM U413, UnivRouenFrance
| | - Y Anouar
- IFRMP 23, INSERM U413, UnivRouenFrance
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35
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Doumèche B, Galas L, Vaudry H, Di Martino P. Membrane Foulants Characterization in a Drinking Water Production Unit. Food and Bioproducts Processing 2007. [DOI: 10.1205/fbp06020] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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36
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Chartrel N, Alvear-Perez R, Leprince J, Iturrioz X, Reaux-Le Goazigo A, Audinot V, Chomarat P, Coge F, Nosjean O, Rodriguez M, Galizzi JP, Boutin JA, Vaudry H, Llorens-Cortes C. Comment on "Obestatin, a peptide encoded by the ghrelin gene, opposes ghrelin's effects on food intake". Science 2007; 315:766; author reply 766. [PMID: 17289961 DOI: 10.1126/science.1135047] [Citation(s) in RCA: 147] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Zhang et al. (Research Articles, 11 November 2005, p. 996) reported that obestatin, a peptide derived from the ghrelin precursor, activated the orphan G protein-coupled receptor GPR39. However, we found that I125-obestatin does not bind GPR39 and observed no effects of obestatin on GPR39-transfected cells in various functional assays (cyclic adenosine monophosphate production, calcium mobilization, and GPR39 internalization). Our results indicate that obestatin is not the cognate ligand for GPR39.
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Affiliation(s)
- N Chartrel
- Institut National de la Santé et de la Recherche Médicale (INSERM), U413, Laboratory of Cellular and Molecular Neuroendocrinology, and European Institute for Peptide Research (IFRMP 23), University of Rouen, 76821 Mont-Saint-Aignan, France
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37
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Di Martino P, Doumeche B, Galas L, Vaudry H, Heim V, Habarou H. Assessing chemical cleaning of nanofiltration membranes in a drinking water production plant: a combination of chemical composition analysis and fluorescence microscopy. Water Sci Technol 2007; 55:219-25. [PMID: 17546990 DOI: 10.2166/wst.2007.262] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The efficiency of cleaning procedures to remove the fouling deposit from the surface of NF membranes operating in the drinking water plant of Méry sur Oise (Val d'Oise, France) was assessed by a combination of chemical analysis and fluorescence microscopy. The ATR-FTIR spectra of the fouled membranes revealed the presence of biological matter at the membrane surface, mainly composed of polysaccharides, nucleic acids and proteins. IR bands corresponding to the membrane material were detected for stage 1 but not for stage 3. Confocal laser scanning microscopy (CLSM) observations confirmed the microbial origin of the fouling deposit. After chemical cleaning, the analysis of the inorganic foulants revealed a significant decrease of the inorganic content. Moreover, ATR-FTIR spectra of the fouled membranes were modified, mainly in a broad complex region corresponding to polysaccharides and nucleic acids. The amide bands were also altered for stage 1, and some peaks corresponding to the clean membrane appeared for stage 3 after cleaning. CLSM observations revealed a general decrease of the lectin staining for the two stages with some variations between lectins. A decrease of the DAPI staining indicative of the removal of some microbial cells was also observed for stage 1. In conclusion, cleaning of the NF fouled membranes decreased significantly the inorganic foulants but only partially removed the organic fouling deposit characteristic of a microbial biofilm.
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Affiliation(s)
- P Di Martino
- Laboratoire ERRMECe (EA1391), Université de Cergy-Pontoise 2 avenue Adolphe Chauvin BP222, 95302, Pontoise, France.
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38
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Prosser HCG, Leprince J, Vaudry H, Richards AM, Forster ME, Pemberton CJ. Cardiovascular effects of native and non-native urotensin II and urotensin II-related peptide on rat and salmon hearts. Peptides 2006; 27:3261-8. [PMID: 17097764 DOI: 10.1016/j.peptides.2006.09.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2006] [Revised: 09/28/2006] [Accepted: 09/28/2006] [Indexed: 11/21/2022]
Abstract
Urotensin II (UII) was first discovered in the urophyses of goby fish and later identified in mammals, while urotensin II-related peptide (URP) was recently isolated from rat brain. We studied the effects of UII on isolated heart preparations of Chinook salmon and Sprague-Dawley rats. Native rat UII caused potent and sustained, dose-dependent dilation of the coronary arteries in the rat, whereas non-native UII (human and trout UII) showed attenuated vasodilation. Rat URP dilated rat coronary arteries, with 10-fold less potency compared with rUII. In salmon, native trout UII caused sustained dilation of the coronary arteries, while rat UII and URP caused significant constriction. Nomega-nitro-(l)-arginine methyl (l-NAME) and indomethacin significantly attenuated the URP and rat UII-induced vasodilation in the rat heart. We conclude that UII is a coronary vasodilator, an action that is species form specific. We also provide the first evidence for cardiac actions of URP, possibly via mechanisms common with UII.
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Affiliation(s)
- H C G Prosser
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand.
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39
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López-Atalaya J, Roussel B, Levrat D, Nicole O, Benchenane K, Rault S, Vaudry H, Petersen K, Ali C, Vivien D. ID: 96 Molecular requirements for modulation of NMDA receptor signaling by tissue-type plasminogen activator. J Thromb Haemost 2006. [DOI: 10.1111/j.1538-7836.2006.00096.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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40
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Gouardères C, Mazarguil H, Mollereau C, Chartrel N, Leprince J, Vaudry H, Zajac JM. Functional differences between NPFF1 and NPFF2 receptor coupling: high intrinsic activities of RFamide-related peptides on stimulation of [35S]GTPgammaS binding. Neuropharmacology 2006; 52:376-86. [PMID: 17011599 DOI: 10.1016/j.neuropharm.2006.07.034] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2006] [Revised: 07/28/2006] [Accepted: 07/28/2006] [Indexed: 11/30/2022]
Abstract
By using an optimized [(35)S]GTPgammaS binding assay, the functional activities (potency and efficacy) of peptides belonging to three members of the RFamide family; Neuropeptide FF (NPFF), prolactin-releasing peptide (PrRP) and 26RFamide, were investigated on NPFF(1) and NPFF(2) receptors stably expressed in Chinese Hamster Ovary (CHO) cells. Despite their large differences in affinity and selectivity, all analogues tested behaved as agonists toward NPFF(1) and NPFF(2) receptors. High NaCl concentration in the assay strongly increased the efficacy toward NPFF(2) receptors and augmented differences among agonists. In low sodium conditions, whereas the potencies of agonists correlated with their affinities for NPFF(1) receptors, NPFF(2) receptors exhibited an extraordinary activity since all compounds tested displayed EC(50) values of GTPgammaS binding lower than their K(I) values. Comparisons of functional values between NPFF(1) and NPFF(2) receptors revealed unexpected potent selective NPFF(2) agonists especially for the PLRFamide and the VGRFamide sequences. By using blocker peptides, we also show that Galpha(i3) and Galpha(s) are the main transducers of NPFF(1) receptors while NPFF(2) are probably coupled with Galpha(i2), Galpha(i3), Galpha(o) and Galpha(s) proteins. Our data indicate that NPPF(1) and NPFF(2) receptors are differently coupled to G proteins in CHO cells.
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Affiliation(s)
- C Gouardères
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 Route de Narbonne, 31077 Toulouse Cedex, France
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41
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Compère V, Ouellet J, Luu-The V, Dureuil B, Tonon MC, Vaudry H, Labrie F, Pelletier G. Role of androgens and glucocorticoids in the regulation of diazepam-binding inhibitor mRNA levels in male mouse hypothalamus. Brain Res 2006; 1119:50-7. [PMID: 16963002 DOI: 10.1016/j.brainres.2006.08.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2006] [Revised: 08/11/2006] [Accepted: 08/12/2006] [Indexed: 10/24/2022]
Abstract
In peripheral organs, gonadal and adrenal steroids regulate diazepam-binding inhibitor (DBI) mRNA expression. In order to further investigate the involvement of peripheral steroid hormones in the modulation of brain DBI mRNA expression, we studied by semiquantitative in situ hybridization the effect of adrenalectomy (ADX) and castration (CX) and short-term replacement therapy on DBI mRNA levels in the male mouse hypothalamus. Cells expressing DBI mRNA were mostly observed in the arcuate nucleus, the median eminence and the ependyma bordering the third ventricle. In the median eminence and the ependyma bordering the third ventricule, the DBI gene expression was decreased in ADX rats and a single injection of corticosterone to ADX rats induced a significant increase in DBI gene expression at 3 and 12 h time intervals without completely restoring the basal DBI mRNA expression observed in intact mice. In the arcuate nucleus, ADX and corticosterone administration did not modify DBI mRNA expression. CX down-regulated DBI gene expression in the ependyma bordering the third ventricle. The administration of dihydrotestosterone (3-24 h) completely reversed the inhibitory effect of CX. In the median eminence and arcuate nucleus, neither CX or dihydrotestosterone administration modified DBI mRNA levels. These results suggest that the effects of glucocorticoids on the hypothalamo-pituitary-adrenocortical axis and androgens on the hypothalamo-pituitary-gonadal axis are mediated by DBI.
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Affiliation(s)
- V Compère
- European Institute for Peptide Research (IFRMP 23), Laboratory of Cellular and Molecular Neuroendocrinology, INSERM U413, UA CNRS, University of Rouen, Mont-Saint-Aignan, France
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42
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Mounien L, Bizet P, Boutelet I, Gourcerol G, Fournier A, Vaudry H, Jégou S. Pituitary adenylate cyclase-activating polypeptide directly modulates the activity of proopiomelanocortin neurons in the rat arcuate nucleus. Neuroscience 2006; 143:155-63. [PMID: 16962718 DOI: 10.1016/j.neuroscience.2006.07.022] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2006] [Revised: 07/20/2006] [Accepted: 07/20/2006] [Indexed: 11/20/2022]
Abstract
Pituitary adenylate cyclase-activating polypeptide (PACAP) and the proopiomelanocortin (POMC)-derived peptide alpha-melanocyte-stimulating hormone (alpha-MSH) both regulate multiple neuroendocrine functions and feeding behavior. Two subtypes of PACAP receptor mRNAs, pituitary adenylate cyclase-activating polypeptide-specific receptor (PAC1-R) and pituitary adenylate cyclase-activating polypeptide/vasoactive intestinal polypeptide mutual receptor (VPAC2-R), are actively expressed in the arcuate nucleus of the hypothalamus, where POMC cell bodies are located. This observation led us to investigate the possible regulatory action of PACAP on rat POMC neurons. Double-labeling in situ hybridization histochemistry revealed that approximately 50% of POMC-producing neurons express PAC1-R and/or VPAC2-R mRNAs. The proportion of POMC neurons that also contain PAC1-R mRNA was homogeneous along the rostro-caudal axis of the arcuate nucleus while POMC-positive cell bodies expressing the VPAC2-R subtype were more abundant in the rostral region. Incubation of mediobasal hypothalamic explants with PACAP (10(-7) M; 30 min) increased POMC mRNA expression, and this effect was blocked by PACAP6-38 (10(-6) M). In contrast, incubation with vasoactive intestinal polypeptide (10(-7) M) did not affect POMC mRNA level. Incubation of hypothalamic fragments with PACAP (10(-7) M) caused a significant increase in alpha-MSH content in the tissue and in the incubation medium. Altogether, the present results reveal that exogenous PACAP, acting probably through PAC1-R, regulates the activity of POMC neurons in the rat hypothalamus. These data suggest that the effects of PACAP on the gonadotropin-releasing hormone neuroendocrine axis and the regulation of feeding behavior may be mediated, at least in part, through modulation of POMC neurons.
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MESH Headings
- Animals
- Arcuate Nucleus of Hypothalamus/cytology
- Arcuate Nucleus of Hypothalamus/drug effects
- Dose-Response Relationship, Drug
- Gene Expression/drug effects
- In Situ Hybridization/methods
- In Vitro Techniques
- Male
- Neurons/drug effects
- Pituitary Adenylate Cyclase-Activating Polypeptide/pharmacology
- Pro-Opiomelanocortin/metabolism
- RNA, Messenger/metabolism
- Radioimmunoassay/methods
- Rats
- Rats, Wistar
- Receptors, Melanocortin/genetics
- Receptors, Melanocortin/metabolism
- Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I/genetics
- Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I/metabolism
- Receptors, Vasoactive Intestinal Peptide, Type II/genetics
- Receptors, Vasoactive Intestinal Peptide, Type II/metabolism
- Reverse Transcriptase Polymerase Chain Reaction/methods
- Statistics, Nonparametric
- Time Factors
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Affiliation(s)
- L Mounien
- INSERM U 413, Laboratory of Cellular and Molecular Neuroendocrinology, European Institute for Peptide Research (IFRMP 23), UA CNRS, University of Rouen, 76821 Mont-Saint-Aignan, France
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43
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Galas L, Bidaud I, Bulant M, Jenks BG, Ouwens DTWM, Jégou S, Ladram A, Roubos EW, Nicolas P, Tonon MC, Vaudry H. In situ hybridization localization of TRH precursor and TRH receptor mRNAs in the brain and pituitary of Xenopus laevis. Ann N Y Acad Sci 2006; 1040:95-105. [PMID: 15891012 DOI: 10.1196/annals.1327.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We examined the distribution of the mRNAs encoding proTRH and the three TRH receptor subtypes (xTRHR1, xTRHR2, and xTRHR3) in the Xenopus laevis CNS and pituitary. A positive correlation was generally observed between the expression patterns of proTRH and xTRHR mRNAs. xTRHRs were widely expressed in the telencephalon and diencephalon, where two or even three xTRHR mRNAs were often simultaneously observed within the same brain structures. In the pituitary, xTRHR2 was selectively expressed in the distal lobe, and xTRHR3 was found exclusively in the intermediate lobe of white background-adapted animals, indicating that, in amphibians, the effect of TRH on alpha-melanotropin (alpha-MSH) secretion from melanotrope cells is mediated through the novel receptor subtype xTRHR3.
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Affiliation(s)
- L Galas
- European Institute for Peptide Research (IFRMP 23), Laboratory of Cellular and Molecular Neuroendocrinology, INSERM U413, UA CNRS, University of Rouen, Mont-Saint-Aignan, France
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44
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Kodjo KM, Contesse V, Do Rego JL, Aklikokou K, Titrikou S, Gbeassor M, Vaudry H. In vitro effects of crude extracts of Parkia biglobosa (Mimosaceae), Stereospermum kunthianum (Bignoniaceae) and Biophytum petersianum (Oxalidaceae) on corticosteroid secretion in rat. J Steroid Biochem Mol Biol 2006; 100:202-8. [PMID: 16820293 DOI: 10.1016/j.jsbmb.2006.04.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2006] [Accepted: 04/18/2006] [Indexed: 10/24/2022]
Abstract
Previous studies conducted in guinea pig, rat and rabbit have revealed that crude extracts from Parkia biglobosa, Stereospermum kunthianum and Biophytum petersianum exert hypotensive and/or hypoglycemic activities. Since corticosteroids are involved in the control of arterial blood pressure and glycemia, we have investigated the possible effects of these plant extracts on rat adrenal tissue in vitro. Short-term administration of crude semi-ethanolic extracts of P. biglobosa and S. kunthianum to perifused rat adrenal tissue did not induce any significant changes in corticosteroid output. Conversely, the B. petersianum extract caused a dose-dependent increase in corticosterone and aldosterone secretion. Repeated infusions or prolonged administration of B. petersianum extract did not produce any apparent attenuation of the steroid response. Altogether, these data indicate that a semi-ethanolic extract of B. petersianum dose-dependently stimulates corticosterone and aldosterone secretion in rat without any desensitization phenomenon.
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Affiliation(s)
- K M Kodjo
- Department of Animal Physiology, Faculty of Science, JER 3006, University of Lomé, B.P. 1515, Lomé, Togo
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45
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Peinado JR, Cruz-García D, Vázquez-Martínez R, Anouar Y, Tonon MC, Vaudry H, Gracia-Navarro F, Castaño JP, Malagón MM. RT-PCR analysis of the expression of POMC and its processing enzyme PC1 in amphibian melanotropes. Gen Comp Endocrinol 2006; 147:222-30. [PMID: 16480985 DOI: 10.1016/j.ygcen.2006.01.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2005] [Revised: 12/22/2005] [Accepted: 01/02/2006] [Indexed: 11/24/2022]
Abstract
The frog intermediate lobe comprises two functionally distinct cell subtypes, referred to as secretory and storage melanotropes, which differ in their ultrastructure, secretory, and synthetic rates, and display dissimilar responses to hypothalamic regulatory factors. All these differences make melanotrope subtypes an excellent model to analyze the expression and regulation of genes involved in the control and maintenance of the secretory state of endocrine cells. However, quantification of the expression levels of genes involved in the secretory process requires the characterization of a gene whose expression remains constant irrespective of the secretory state of the cells. In this study, we have cloned the glyceraldehyde-3-phosphate dehydrogenase (GAPDH) gene from frog pituitary and have evaluated its suitability as internal standard in gene expression studies in melanotropes. A semiquantitative RT-PCR system developed to this end revealed that secretory melanotropes and storage melanotropes possess similar expression levels of GAPDH, whereas, as expected, secretory melanotropes showed higher levels of POMC transcripts than storage cells. Furthermore, we found that the expression of the convertase PC1, an intracellular protease involved in POMC processing, parallels that of POMC, thus suggesting that the higher secretory rate of the POMC-derived peptide alpha-MSH exhibited by secretory melanotropes is supported by their higher PC1 expression levels. In addition, we have shown that both POMC and PC1 mRNAs are up-regulated by the hypothalamic factor TRH in melanotrope cell cultures. In contrast, the inhibitory factor NPY reduced the expression level of the convertase but did not modify that of POMC. Taken together, these results demonstrate that PC1 expression is regulated in melanotropes by both stimulatory (TRH) and inhibitory (NPY) hypothalamic signals, in a manner which essentially parallels that observed for the precursor POMC.
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Affiliation(s)
- J R Peinado
- Department of Cell Biology, Physiology and Immunology, University of Cordoba, 14014 Cordoba, Spain
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46
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Navarro VM, Fernández-Fernández R, Nogueiras R, Vigo E, Tovar S, Chartrel N, Le Marec O, Leprince J, Aguilar E, Pinilla L, Dieguez C, Vaudry H, Tena-Sempere M. Novel role of 26RFa, a hypothalamic RFamide orexigenic peptide, as putative regulator of the gonadotropic axis. J Physiol 2006; 573:237-49. [PMID: 16543265 PMCID: PMC1779712 DOI: 10.1113/jphysiol.2006.106856] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
The close link between reproductive function and body energy stores relies on a complex neuroendocrine network of common regulatory signals, the nature of which is yet to be fully elucidated. Recently, 26RFa was identified in amphibians and mammals as a conserved hypothalamic neuropeptide of the RFamide family, with a potent orexigenic activity. Yet, despite its proposed role as hypophysiotropic factor, the function of 26RFa in the control of pituitary gonadotropins and, hence, of the reproductive axis remains unexplored. In the present study, the effects of 26RFa on gonadotropin secretion were evaluated in the rat by a combination of in vitro and in vivo approaches. At the pituitary, 26RFa dose-dependently enhanced basal and gonadotropin-releasing hormone (GnRH)-stimulated luteinizing hormone (LH) secretion from male and cyclic female rats. This effect was mimicked by the active fragment 26RFa(20-26), as well as by the related 43RFa peptide. Moreover, expression of the genes encoding 26RFa and its putative receptor, GPR103, was demonstrated in rat pituitary throughout postnatal development. In vivo, intracerebral injection of 26RFa evoked a significant increase in serum LH levels in cyclic and ovariectomized females; this response which was also observed after central injection of 26RFa(20-26) and 43RFa peptides, as well as after systemic administration of 26RFa. Conversely, central and systemic injection of 26RFa failed to significantly modify gonadotropin secretion in adult male rats, even after repeated administration of the peptide. In summary, we present herein novel evidence for the potential role of the orexigenic peptide 26RFa in the control of the gonadotropic axis, thus suggesting its potential involvement in the joint control of energy balance and reproduction, especially in the female.
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Affiliation(s)
- V M Navarro
- Department of Cell Biology, Physiology and Immunology, Faculty of Medicine, University of Córdoba, Avda. Menéndez Pidal s/n 14004, Córdoba, Spain
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47
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Peinado JR, Vazquez-Martinez R, Cruz-García D, Ruiz-Navarro A, Anouar Y, Tonon MC, Vaudry H, Gracia-Navarro F, Castano JP, Malagón MM. Differential expression and processing of chromogranin A and secretogranin II in relation to the secretory status of endocrine cells. Endocrinology 2006; 147:1408-18. [PMID: 16357044 DOI: 10.1210/en.2005-0975] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Chromogranin A (CgA) and secretogranin II (SgII) are neuroendocrine secretory proteins that participate in regulation of the secretory pathway and also serve as precursors of biologically active peptides. To investigate whether there is a relationship between the expression, distribution, and processing of CgA and SgII and the degree of secretory activity, we employed two melanotrope subpopulations of the pituitary intermediate lobe that exhibit opposite secretory phenotypes. Thus, although one of the melanotrope subtypes shows high secretory activity, the other exhibits characteristics of a hormone storage phenotype. Our data show that SgII expression levels were higher in secretory melanotropes, whereas CgA expression showed similar rates in both cell subsets. The use of various antibodies revealed the presence of the unprocessed proteins as well as three CgA-derived peptides (67, 45, and 30 kDa) and six SgII-derived peptides (81, 66, 55, 37, 32, and 30 kDa) in both subpopulations. However, the smallest molecular forms of both granins predominated in secretory melanotropes, whereas the largest SgII- and CgA-immunoreactive peptides were more abundant in storage melanotropes, which is suggestive of a more extensive processing of granins in the secretory subset. Confocal microscopy studies showed that CgA immunoreactivity was higher in storage cells, but SgII immunoreactivity was higher in secretory melanotropes. Taken together, our results indicate that SgII and CgA are differentially regulated in melanotrope subpopulations. Thus, SgII expression is strongly related to the secretory activity of melanotrope cells, whereas CgA expression may not be related to secretory rate, but, rather, to hormone storage in this endocrine cell type.
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Affiliation(s)
- J R Peinado
- Department of Cell Biology, Physiology, and Immunology, Campus de Rabanales. Edificio Severo Ochoa, Planta 3, University of Cordoba, E-14014 Cordoba, Spain
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48
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Malagón MM, Cruz D, Vázquez-Martínez R, Peinado JR, Anouar Y, Tonon MC, Vaudry H, Gracia-Navarro F, Castaño JP. Analysis of Rab18 and a new golgin in the secretory pathway. Ann N Y Acad Sci 2006; 1040:137-9. [PMID: 15891017 DOI: 10.1196/annals.1327.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Two new amphibian genes have been isolated and characterized from frog melanotropes, and the level of expression of these genes is related to the secretory status of the cells. Both genes, Rab18 and a novel member of the golgin family of proteins, are ubiquitously expressed in endocrine and nonendocrine tissues, and their corresponding proteins appear to show intracellular distributions associated with discrete vesicular and tubular structures, respectively, suggesting that they may play relevant roles in the regulation of the secretory pathway.
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Affiliation(s)
- M M Malagón
- Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Spain.
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Sicard F, De Groot D, Gras M, Leprince J, Conlon JM, Roubos EW, Vaudry H, Delarue C. Neuroendocrine Regulation of Frog Adrenocortical Cells by Neurotensin. Ann N Y Acad Sci 2006; 1040:200-5. [PMID: 15891025 DOI: 10.1196/annals.1327.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We previously characterized the primary structure of neurotensin (NT) from an extract of the intestine of the frog Rana esculenta. In this study, we provide evidence for the involvement of NT in the neurocrine regulation of the secretory activity of frog adrenocortical cells. Immunohistochemical studies revealed that the adrenal gland of R. esculenta is innervated by a dense network of NT-immunoreactive fibers. Graded concentrations of frog NT induced a dose-dependent stimulation of corticosterone and aldosterone secretion by frog adrenocortical explants through activation of two receptors with pEC(50) of 9.8 and 6.9. These data support the view that NT, released by nerve fibers within the frog adrenal gland, acts locally to control corticosteroid secretion.
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Affiliation(s)
- F Sicard
- European Institute for Peptide Research (IFRMP 23), Laboratory of Cellular and Molecular Neuroendocrinology, INSERM U413, UA CNRS, University of Rouen, Mont-Saint-Aignan, France
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50
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Lancien F, Leprince J, Mimassi N, Mabin D, Vaudry H, Le Mével JC. Time-Course Effects of Centrally Administered Native Urotensin-II on Motor and Cardioventilatory Activity in Trout. Ann N Y Acad Sci 2006; 1040:371-4. [PMID: 15891065 DOI: 10.1196/annals.1327.065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Although in most vertebrate species urotensin-II (UII) is synthesized in neurons of the central nervous system, little is known regarding the physiological actions of UII in the brain. We have investigated the effects of intracerebroventricular (ICV) administration of synthetic trout UII (1, 5, and 50 pmol) on total motor activity (ACT), ventilatory frequency (VF), ventilatory amplitude (VA), and heart rate (HR) in the unanesthetized trout. ICV injection of UII increased ACT in a dose-dependent manner, and the maximal effect was observed at a dose of 5 pmol. At doses of 1 and 5 pmol, UII did not affect VF, VA, or HR. At the highest dose tested (50 pmol), UII not only increased ACT, but also significantly activated VF, VA, and HR. In contrast, ICV injection of synthetic trout angiotensin-II (5 pmol) did not produce any effect on ACT, VF, or VA, but sharply increased HR. These data provide the first evidence that UII can act centrally to induce motor activity in a nonmammalian vertebrate species.
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Affiliation(s)
- F Lancien
- LaTIM (INSERM U650), Laboratory of Neurophysiology, Faculty of Medicine, Brest, France
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