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Conejero R, Conejero C, Alcalde V, García-Latasa de Araníbar J. Pseudoepitheliomatous Hyperplasia: An Uncommon Reaction in Tattoos. Actas Dermo-Sifiliográficas (English Edition) 2020. [DOI: 10.1016/j.adengl.2020.10.021] [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: 10/23/2022] Open
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Sánchez-Bernal J, Conejero C, Conejero R. Recurrent Aphthous Stomatitis. Actas Dermosifiliogr (Engl Ed) 2020; 111:471-480. [PMID: 32451064 DOI: 10.1016/j.ad.2019.09.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 08/17/2019] [Accepted: 09/25/2019] [Indexed: 12/21/2022] Open
Abstract
Recurrent aphthous stomatitis is a chronic inflammatory disease of the oral mucosa. It is characterized by painful mouth ulcers that cannot be explained by an underlying disease. Recurrent oral mucosal ulcers require a proper differential diagnosis to rule out other possible causes before recurrent aphthous stomatitis is diagnosed. The condition is common, with prevalence rates ranging from 5 to 60% in different series. Its pathogenesis is unknown, but multiple factors are considered to play a part. There are no standardized treatments for this condition and none of the treatments are curative. The goal of any treatment should be to alleviate pain, reduce the duration of ulcers, and prevent recurrence.
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Affiliation(s)
- J Sánchez-Bernal
- Servicio de Dermatología, Hospital Clínico Universitario Lozano Blesa, Zaragoza, España
| | - C Conejero
- Unidad de Dermatología, Centro Médico Millenium, Zaragoza, España
| | - R Conejero
- Departamento de Dermatología, Hospital Royo Villanova, Zaragoza, España.
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Luque Paz DL, Mansier O, Riou J, Conejero C, Roy L, Belkhodja C, Ugo V, Giraudier S. Positive impact of molecular analysis on prognostic scores in essential thrombocythemia: a single center prospective cohort experience. Haematologica 2018; 104:e134-e137. [PMID: 30337359 DOI: 10.3324/haematol.2018.197699] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- Damien Luque Luque Paz
- Université Angers, UFR Santé.,CHU d'Angers, Laboratoire d'Hématologie.,INSERM, CRCINA Université de Nantes, Université d'Angers.,France Intergroupe des syndromes Myéloprolifératifs (FIM), Nice
| | - Olivier Mansier
- France Intergroupe des syndromes Myéloprolifératifs (FIM), Nice.,Université de Bordeaux, UFR Sciences de la Vie et de la Santé.,CHU de Bordeaux, Laboratoire d'Hématologie.,INSERM U1034, Université de Bordeaux
| | - Jérémie Riou
- Université Angers, UFR Santé.,MINT UMR INSERM 1066, Université d'Angers
| | - Carole Conejero
- Université Paris 12, Créteil.,APHP, Hôpital Henri Mondor, Laboratoire d'Hématologie, Créteil
| | - Lydia Roy
- Université Paris 12, Créteil.,APHP, Hôpital Henri Mondor, Service Clinique d'Hématologie, Créteil
| | - Célia Belkhodja
- France Intergroupe des syndromes Myéloprolifératifs (FIM), Nice.,Université Paris 12, Créteil.,APHP, Hôpital Henri Mondor, Service Clinique d'Hématologie, Créteil
| | - Valérie Ugo
- Université Angers, UFR Santé.,CHU d'Angers, Laboratoire d'Hématologie.,INSERM, CRCINA Université de Nantes, Université d'Angers.,France Intergroupe des syndromes Myéloprolifératifs (FIM), Nice
| | - Stéphane Giraudier
- France Intergroupe des syndromes Myéloprolifératifs (FIM), Nice .,Université Paris-Diderot.,APHP, Hôpital Saint Louis, Laboratoire de Biologie Cellulaire, Paris, France
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Mansier O, Luque Paz D, Ianotto JC, Le Bris Y, Chauveau A, Boyer F, Conejero C, Fitoussi O, Riou J, Adiko D, Touati M, Chauzeix J, Viallard JF, Béné MC, Giraudier S, Ugo V, Lippert E. Clinical and biological characterization of MPN patients harboring two driver mutations, a French intergroup of myeloproliferative neoplasms (FIM) study. Am J Hematol 2018; 93:E84-E86. [PMID: 29266414 DOI: 10.1002/ajh.25014] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 12/16/2017] [Accepted: 12/18/2017] [Indexed: 01/23/2023]
Affiliation(s)
- Olivier Mansier
- UFR Sciences de la Vie et de la Santé; Université de Bordeaux; Bordeaux France
- CHU de Bordeaux, Laboratoire d'Hématologie; Bordeaux France
- INSERM U1218, ACTION, Université de Bordeaux; Bordeaux France
| | - Damien Luque Paz
- Université Angers, UFR Santé; Angers France
- CHU d'Angers, Laboratoire d'Hématologie; Angers France
- CRCINA, INSERM, Université d'Angers; Angers France
- Fédération Hospitalo-Universitaire ‘Grand Ouest Against Leukemia’ (FHU GOAL); Angers France
| | - Jean-Christophe Ianotto
- Fédération Hospitalo-Universitaire ‘Grand Ouest Against Leukemia’ (FHU GOAL); Angers France
- CHU de Brest, Service d'Hématologie Clinique; Brest France
| | - Yannick Le Bris
- Fédération Hospitalo-Universitaire ‘Grand Ouest Against Leukemia’ (FHU GOAL); Angers France
- CHU de Nantes, Laboratoire d'Hématologie; Nantes France
| | - Aurélie Chauveau
- Fédération Hospitalo-Universitaire ‘Grand Ouest Against Leukemia’ (FHU GOAL); Angers France
- CHU de Brest, Laboratoire d'Hématologie; Brest France
- INSERM U1078, CHRU Brest; Brest France
- Université de Bretagne Occidentale, UFR Médecine; Brest France
| | - Françoise Boyer
- Fédération Hospitalo-Universitaire ‘Grand Ouest Against Leukemia’ (FHU GOAL); Angers France
- CHU d'Angers, Service des Maladies du Sang; Angers France
| | - Carole Conejero
- AP-HP, CHU Henri Mondor, Laboratoire d'Hématologie; Créteil France
| | - Olivier Fitoussi
- Polyclinique Bordeaux Nord Aquitaine, Service d'hémato-oncologie; Bordeaux France
| | - Jérémie Riou
- INSERM 1066 MINT, Université d'Angers; Angers France
| | - Didier Adiko
- Service de Médecine-Hématologie; CH Robert Boulin; Libourne France
| | | | - Jasmine Chauzeix
- CHU de Limoges, Laboratoire d'Hématologie, CRBS; Limoges France
- UMR CNRS 7276; Limoges France
| | | | - Marie C. Béné
- Fédération Hospitalo-Universitaire ‘Grand Ouest Against Leukemia’ (FHU GOAL); Angers France
- CHU de Nantes, Laboratoire d'Hématologie; Nantes France
| | | | - Valérie Ugo
- Université Angers, UFR Santé; Angers France
- CHU d'Angers, Laboratoire d'Hématologie; Angers France
- CRCINA, INSERM, Université d'Angers; Angers France
- Fédération Hospitalo-Universitaire ‘Grand Ouest Against Leukemia’ (FHU GOAL); Angers France
| | - Eric Lippert
- Fédération Hospitalo-Universitaire ‘Grand Ouest Against Leukemia’ (FHU GOAL); Angers France
- CHU de Brest, Laboratoire d'Hématologie; Brest France
- INSERM U1078, CHRU Brest; Brest France
- Université de Bretagne Occidentale, UFR Médecine; Brest France
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Partouche N, Conejero C, Barathon Q, Moroch J, Tulliez M, Cordonnier C, Giraudier S. Emergence of MPLW515 mutation in a patient with CALR deletion: Evidence of secondary acquisition of MPL mutation in the CALR clone. Hematol Oncol 2017; 36:336-339. [PMID: 28556926 DOI: 10.1002/hon.2431] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 03/21/2017] [Accepted: 04/11/2017] [Indexed: 12/18/2022]
Abstract
Myeloproliferative neoplasms are characterized by transduction pathway recognized as mutually exclusive molecular abnormalities such as BCR-ABL translocation, JAK2V617F or JAK2 exon 12 mutations, MPL w515, and CALR mutations. However, in some rare cases, associations of such mutations are found in 1 patient. This can be related to 2 pathologies (at least 2 different clones harboring 2 mutations) or associated mutations in 1 clone. We describe here such an association of CALR and MPL mutations in a patient harboring the second mutation in a subclone during the phenotypic evolution of the myeloproliferative neoplasms.
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Affiliation(s)
- Nicolas Partouche
- Hematology Laboratory, Henri Mondor Hospital, AP-HP, Créteil, France
| | | | - Quentin Barathon
- Hematology Laboratory, Henri Mondor Hospital, AP-HP, Créteil, France
| | - Julien Moroch
- Pathology Unit, Henri Mondor Hospital, AP-HP, Créteil, France
| | - Michel Tulliez
- Hematology Laboratory, Henri Mondor Hospital, AP-HP, Créteil, France.,University Paris-Est Créteil (UPEC), Créteil, France.,Department of Clinical Hematology and Cell Therapy, Henri Mondor Hospital, AP-HP, Créteil, France
| | - Catherine Cordonnier
- University Paris-Est Créteil (UPEC), Créteil, France.,Department of Clinical Hematology and Cell Therapy, Henri Mondor Hospital, AP-HP, Créteil, France
| | - Stephane Giraudier
- Hematology Laboratory, Henri Mondor Hospital, AP-HP, Créteil, France.,University Paris-Est Créteil (UPEC), Créteil, France.,Department of Clinical Hematology and Cell Therapy, Henri Mondor Hospital, AP-HP, Créteil, France.,INSERM U1131, Saint Louis Hospital, Paris, France
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Verger E, Teillet F, Conejero C, Letort G, Chomienne C, Giraudier S, Cassinat B. Unexplained thrombocytosis: association of Baltimore polymorphism with germline MPL nonsense mutation. Br J Haematol 2015; 175:167-9. [PMID: 26568271 DOI: 10.1111/bjh.13840] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Emmanuelle Verger
- Service de Biologie Cellulaire, AP-HP, Hopital Saint-Louis, Paris, France
| | - France Teillet
- Laboratoire d'Hématologie, AP-HP, Hopital Louis Mourier, Colombes, France
| | | | - Gil Letort
- Inserm UMR-S 1131, Hopital Saint-Louis, Paris, France
| | - Christine Chomienne
- Service de Biologie Cellulaire, AP-HP, Hopital Saint-Louis, Paris, France.,Inserm UMR-S 1131, Hopital Saint-Louis, Paris, France.,Université Paris-Diderot, Paris, France
| | - Stephane Giraudier
- Faculte de medecine, Université Paris 12, Creteil, France.,Laboratoire d'Hématologie, AP-HP, Hopital Henri Mondor, Creteil, France
| | - Bruno Cassinat
- Service de Biologie Cellulaire, AP-HP, Hopital Saint-Louis, Paris, France. .,Inserm UMR-S 1131, Hopital Saint-Louis, Paris, France.
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Pastushenko I, Conejero C, Carapeto FJ. Lymphangiogenesis: implications for diagnosis, treatment, and prognosis in patients with melanoma. Actas Dermosifiliogr 2014; 106:7-16. [PMID: 24890812 DOI: 10.1016/j.ad.2014.02.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2013] [Revised: 01/06/2014] [Accepted: 02/14/2014] [Indexed: 01/01/2023] Open
Abstract
Disease course in melanoma often cannot be accurately predicted by means of the prognostic factors usually considered in patients with melanoma; therefore, new factors are clearly needed. Increasingly robust scientific evidence shows that tumor lymph vessels play a key role in melanoma that metastasizes by lymphatic and hematogenous pathways. We review current knowledge and examine the implications of lymphangiogenesis in the diagnosis, treatment, and prognosis of patients with melanoma.
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Affiliation(s)
- I Pastushenko
- Servicio de Dermatología, Hospital Clínico Universitario Lozano Blesa, Zaragoza, España.
| | - C Conejero
- Servicio de Dermatología, Hospital Clínico Universitario Lozano Blesa, Zaragoza, España
| | - F J Carapeto
- Facultad de Medicina, Universidad de Zaragoza, Zaragoza, España
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Kiladjian JJ, Elkassar N, Cassinat B, Hetet G, Giraudier S, Balitrand N, Conejero C, Briere J, Fenaux P, Chomienne C, Grandchamp B. Essential thrombocythemias without V617F JAK2 mutation are clonal hematopoietic stem cell disorders. Leukemia 2006; 20:1181-3. [PMID: 16598303 DOI: 10.1038/sj.leu.2404214] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Conejero C, Wright R, Freed W. Glutamate and antimitotic agents induce differentiation, p53 activation, and apoptosis in rodent neostriatal cell lines immortalized with the tsA58 allele of SV40 large T antigen. Exp Neurol 1999; 158:109-20. [PMID: 10448422 DOI: 10.1006/exnr.1999.7083] [Citation(s) in RCA: 7] [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: 12/20/2022]
Abstract
The tsA58 allele of SV40 large T antigen has the ability to immortalize cells, which is thought to be due, in part, to binding of p53 protein by T antigen at 33 degrees C. At the nonpermissive temperature (39.5 degrees C), it is thought that p53 is released, inducing growth arrest, vulnerability to apoptosis, and loss of the immortal phenotype. In cell lines derived from the rat neostriatum immortalized with tsA58, the toxic agents Adriamycin, cytosine arabinoside, and glutamate induced apoptosis and increased p53 activity and differentiation. The apoptosis and p53-inducing effects of the drugs were not greater at 39.5 degrees C compared to 33 degrees C, suggesting that p53 is not effectively blocked even at 33 degrees C. Growth arrest was not induced under most treatment conditions despite p53 induction. On the other hand, process extension was enhanced at 39.5 degrees C compared to 33 degrees C. Therefore, these cell lines are temperature sensitive with respect to differentiation, but not growth regulation or apoptosis.
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Affiliation(s)
- C Conejero
- National Institute on Drug Abuse, Cellular Neurobiology Branch, Baltimore, Maryland 21224, USA
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Dillon-Carter O, Conejero C, Tornatore C, Poltorak M, Freed WJ. N18-RE-105 cells: differentiation and activation of p53 in response to glutamate and adriamycin is blocked by SV40 large T antigen tsA58. Cell Tissue Res 1998; 291:191-205. [PMID: 9426307 DOI: 10.1007/s004410050990] [Citation(s) in RCA: 5] [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: 02/05/2023]
Abstract
Process extension was induced in cells of the N18-RE-105 neuroblastoma-retinal hybrid line by toxic agents, including glutamate and the p53-inducing anticancer agents adriamycin and etoposide. Both adriamycin and glutamate activated p53 as measured by a plasmid transfection assay. It was therefore hypothesized that SV40 large T antigen, which binds p53, would interfere with cellular differentiation. To test this hypothesis, the temperature-sensitive form of SV40 large T was transduced into N18-RE-105 cells by retroviral infection. SV40 large T-infected cells became de-differentiated, grew in tightly-packed colonies, lost expression of neurofilament, and lost the ability to differentiate in response to glutamate and adriamycin. The de-differentiating effect of SV40 large T antigen may be due to binding and inactivation of cellular proteins, such as p53, p107, p130, p300, and retinoblastoma protein, which are important in cellular growth and differentiation. It is suggested that p53 may play a role in cellular differentiation, perhaps under unusual circumstances involving stress or cytotoxicity.
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Affiliation(s)
- O Dillon-Carter
- Section on Preclinical Neuroscience Neuropsychiatry Branch, NIMH Neuroscience Center at St. Elizabeths, 2700 Martin Luther King Ave., Washington, D.C., 20032, USA
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Abstract
Taurine has been shown to act as an osmolyte during the regulatory volume decrease process in a variety of cell types. The nature of the taurine efflux carrier is thought to consist of a diffusional pathway with pharmacological properties similar to a chloride channel or through an anion exchanger. We propose that taurine is a substrate of the anion exchanger AE1, also called band 3. Experiments were performed in rat-erythrocytes, which express large amounts of band 3. Taurine uptake and efflux transport experiments were determined in the presence of inhibitors of anion carriers and chloride channels. Both taurine uptake and efflux were inhibited by band 3 inhibitors 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid (DIDS), 4,4'-dinitrostilbene-2,2'-disulfonic acid (DNDS), niflumic acid, or furosemide. Moreover, DIDS competes with taurine at a common binding site in the uptake process. Specific inhibitors of the electroneutral cotransport as well as inhibitors of the chloride channels were ineffective in blocking taurine transport. Thus we suggest that band 3 may be the protein responsible for taurine transport in rat erythrocytes.
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Affiliation(s)
- C Conejero
- Departamento de Investigacion, Hospital Ramon y Cajal, Madrid, Spain
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Moore KD, Dillon-Carter O, Conejero C, Poltorak M, Chedid M, Tornatore C, Freed WJ. In vitro properties of a newly established medulloblastoma cell line, MCD-1. Mol Chem Neuropathol 1996; 29:107-26. [PMID: 8971690 DOI: 10.1007/bf02814996] [Citation(s) in RCA: 11] [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] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Medulloblastomas are poorly differentiated brain tumors believed to arise from primitive pleuripotential stem cells, and tend to express mixed neuronal and glial properties. In the present study, we examined immunohistochemical and neurotransmitter phenotypic properties in a newly established medulloblastoma cell line, MCD-1. MCD-1 cells were immortal, not contact-inhibited, but did not grow in soft agar. Immunohistochemical studies showed positive staining for neurofilament protein (NF), neuron-specific enolase (NSE), synaptophysin, MAP 2, tau, NCAM 180, vimentin, and S-100 protein. The cells expressed specific uptake of glutamate, serotonin, and choline, but not GABA or dopamine. A significant increase in process extension was seen in response to agents that enhance intracellular cyclic AMP, especially 3-isobutyl-1-methylxanthine (IBMX). Process formation induced by IBMX was associated with a decrease in cell proliferation as evidenced by a reduction in numbers of cells incorporating 5-bromo-2-deoxyuridine (BrdU). No increase in process extension was observed following exposure to NGF or retinoic acid. MCD-1 cells were shown to produce transforming growth factor beta (TGF beta), and were immunopositive for mutant p53. Transfection assays with the PG13-Luc reporter plasmid, which contains a p53-responsive enhancer element and a luciferase reporter gene, suggested MCD-1 cells are deficient in wild-type p53 and do not activate p53 on treatment with the anticancer agent adriamycin. The MCD-1 cell line is suggested to represent an abnormally differentiated cell type, which has some properties consistent with a multipotent neuronal phenotype while retaining some properties of immature cells of a glial lineage. The MCD-1 cell line can be used to provide a model of a medulloblastoma cell line that is resistant to growth-controlling and anticancer agents.
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Affiliation(s)
- K D Moore
- Section on Preclinical Neuroscience, Neuropsychiatry Branch, NIMH, Neuroscience Center, St. Elizabeths, Washington, DC 20032, USA
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Affiliation(s)
- R M del Río
- Dpto. Investigación, Hospital Ramón y Cajal, Madrid, Spain
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Menéndez N, Solís JM, Herreras O, Galarreta M, Conejero C, Martín del Río R. Taurine release evoked by NMDA receptor activation is largely dependent on calcium mobilization from intracellular stores. Eur J Neurosci 1993; 5:1273-9. [PMID: 8275229 DOI: 10.1111/j.1460-9568.1993.tb00912.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [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: 01/29/2023]
Abstract
It is known that the activation of N-methyl-D-aspartate (NMDA) receptors leads to an increase in extracellular taurine concentration in different brain regions. The mechanism that mediates this effect is not totally understood. In this study, rat hippocampal slices were used to determine the dependence of NMDA-induced taurine release on extracellular calcium and/or on calcium mobilization from intracellular stores. NMDA was administered through a microdialysis probe inserted into the slice, at the level of CA1 stratum radiatum, which was also used to collect amino acids from the extracellular space. Field potentials evoked by stimulation of the Schaffer collaterals and recorded in the stratum pyramidale of CA1 were used as a control of NMDA receptor activation. NMDA induced a marked increase in extracellular taurine levels and a decrease in field potential amplitude, and both effects were suppressed in the presence of MK-801, a blocker of the NMDA receptor-linked channel. Dantrolene, an inhibitor of calcium release from intracellular stores, partially inhibited the extracellular taurine increase, while 2-nitro-4-carboxyphenyl-N,N-diphenyl carbamate (NCDC), an inhibitor of phosphatidylinositol-specific phospholipase C activation, had no effect. Removal of extracellular calcium diminished, but did not abolish, the extracellular taurine increase caused by NMDA. The remaining taurine response was totally suppressed by dantrolene, and also by NCDC. These results demonstrate that the release of taurine induced by NMDA receptor activation is triggered by the increase in cytoplasmic calcium concentration. We suggest that, under physiological conditions, calcium influx provides the signal for NMDA-induced taurine release, which is amplified by calcium-dependent calcium mobilization from intracellular stores.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- N Menéndez
- Departamento de Investigación, Hospital Ramón y Cajal, Madrid, Spain
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Galarreta M, Solís JM, Menéndez N, Conejero C, Martín del Río R. Nicotinamide adenine dinucleotides mimic adenosine inhibition on synaptic transmission by decreasing glutamate release in rat hippocampal slices. Neurosci Lett 1993; 159:55-8. [PMID: 7505416 DOI: 10.1016/0304-3940(93)90797-o] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [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: 01/25/2023]
Abstract
To assess the possible inhibitory action of nicotinamide adenine dinucleotides on the synaptic release of glutamate, electrophysiological and biochemical experiments were performed on rat hippocampal slices. Perfusion of adenosine, beta-nicotinamide adenine dinucleotide (NAD) or beta-nicotinamide adenine dinucleotide phosphate (NADP), reversibly inhibited the field excitatory postsynaptic potentials (fEPSP). Dose-response curves for their inhibitory action showed that these three substances had a similar potency in the range of concentrations from 0.1 microM to 100 microM. NADP and adenosine (100 microM) halved the K(+)-induced release of endogenous glutamate and aspartate, leaving gamma-amino-butyric acid (GABA) levels unchanged. 3-Isobutyl-1-methylxanthine (IBMX) 200 microM, an antagonist of the P1-purinoreceptors, antagonized the depressant effects of these coenzymes on both fEPSP and also on amino acid release. Based on these results we propose that nicotinamide adenine dinucleotides, similar to adenosine, inhibit excitatory synaptic transmission in the rat hippocampus by decreasing glutamate release from synaptic terminals.
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Affiliation(s)
- M Galarreta
- Departamento de Investigación, Hospital Ramón y Cajal, INSALUD, Madrid, Spain
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