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Alves R, Petitjean H, Druzhinenko-Silhan D. Psychological approaches to obesity in young adults: state of the art. Front Nutr 2024; 11:1328386. [PMID: 38385013 PMCID: PMC10879406 DOI: 10.3389/fnut.2024.1328386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 01/25/2024] [Indexed: 02/23/2024] Open
Abstract
Background Obesity has become a significant health concern among young adults aged 18-35 years. Addressing this issue is crucial, and exploring psychological treatments and perspectives specifically for this population is essential. Methods This literature review examines psychological treatments for obesity in young adults over the past decade. It focuses on interventions and discussions particularly relevant to this age group. Discussion Research on obesity often overlooks young adults, with most interventions primarily focusing on weight loss and neglecting emotional aspects. Cognitive-behavioral approaches are commonly used for self-regulation and motivation, but psychodynamic perspectives remain underutilized. While group-based methods lack a detailed analysis of benefits, hybrid approaches demonstrate higher engagement compared to technology-only interventions. There is a notable gap in tailoring obesity interventions to meet the unique needs of young adults during this transitional life phase. It's imperative to shift the focus from merely weight loss to a broader consideration of psychological, emotional, and unconscious factors. Integrating group modalities with psychodynamic approaches might offer additional benefits. Conclusion This review highlights the need for further research into the psychological well-being of young adults with obesity. A more comprehensive approach is required to address their distinct needs and psychological factors.
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Cohen J, Petitjean H, Blasco MB, Mizrahi R. Cannabis-induced psychotic disorder with onset during withdrawal: a brief report of emerging evidence. Acta Neuropsychiatr 2024:1-5. [PMID: 38200701 DOI: 10.1017/neu.2023.60] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
OBJECTIVES The link between cannabis use and psychotic symptoms or disorders is well known. However, the relation between cannabis withdrawal and psychotic symptoms is less studied. METHODS To our knowledge, this is the first publication of an observational systematic report of cannabis-induced psychotic disorder with onset during withdrawal. Here, we review patients presenting to a major emergency room in Montreal between January 2020 and September 2023 in a context of psychotic symptoms following cannabis cessation. RESULTS In total, seven male and one female patients presented at the peak of cannabis withdrawal with acute psychotic symptoms, representing less than 1% of all emergency service admissions. CONCLUSIONS We discuss current knowledge regarding the endocannabinoid system and dopamine homeostasis to formulate hypotheses regarding these observations.
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Affiliation(s)
- Johan Cohen
- Douglas Mental Health University Institute, McGill University, Montreal, QC, Canada
| | | | - M Belen Blasco
- Douglas Mental Health University Institute, McGill University, Montreal, QC, Canada
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada
| | - Romina Mizrahi
- Douglas Mental Health University Institute, McGill University, Montreal, QC, Canada
- Department of Psychiatry, McGill University, Montreal, QC, Canada
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3
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Iwasaki M, Lefevre A, Althammer F, Clauss Creusot E, Łąpieś O, Petitjean H, Hilfiger L, Kerspern D, Melchior M, Küppers S, Krabichler Q, Patwell R, Kania A, Gruber T, Kirchner MK, Wimmer M, Fröhlich H, Dötsch L, Schimmer J, Herpertz SC, Ditzen B, Schaaf CP, Schönig K, Bartsch D, Gugula A, Trenk A, Blasiak A, Stern JE, Darbon P, Grinevich V, Charlet A. An analgesic pathway from parvocellular oxytocin neurons to the periaqueductal gray in rats. Nat Commun 2023; 14:1066. [PMID: 36828816 PMCID: PMC9958129 DOI: 10.1038/s41467-023-36641-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 02/08/2023] [Indexed: 02/26/2023] Open
Abstract
The hypothalamic neuropeptide oxytocin (OT) exerts prominent analgesic effects via central and peripheral action. However, the precise analgesic pathways recruited by OT are largely elusive. Here we discovered a subset of OT neurons whose projections preferentially terminate on OT receptor (OTR)-expressing neurons in the ventrolateral periaqueductal gray (vlPAG). Using a newly generated line of transgenic rats (OTR-IRES-Cre), we determined that most of the vlPAG OTR expressing cells targeted by OT projections are GABAergic. Ex vivo stimulation of parvocellular OT axons in the vlPAG induced local OT release, as measured with OT sensor GRAB. In vivo, optogenetically-evoked axonal OT release in the vlPAG of as well as chemogenetic activation of OTR vlPAG neurons resulted in a long-lasting increase of vlPAG neuronal activity. This lead to an indirect suppression of sensory neuron activity in the spinal cord and strong analgesia in both female and male rats. Altogether, we describe an OT-vlPAG-spinal cord circuit that is critical for analgesia in both inflammatory and neuropathic pain models.
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Grants
- R01 HL090948 NHLBI NIH HHS
- R01 NS094640 NINDS NIH HHS
- This work was supported by the Centre National de la Recherche Scientifique contract UPR3212, the Université de Strasbourg contract UPR3212; the University of Strasbourg Institute for Advanced Study (USIAS) fellowship 2014-15, Fyssen Foundation research grant 2015, NARSAD Young Investigator Grant 24821, Agence Nationale de la Recherche (ANR, French Research Foundation) grants n° 19-CE16-0011-0 and n° 20-CE18-0031 (to AC); the Graduate School of Pain EURIDOL, ANR-17-EURE-0022 (to AC and ECC); ANR-DFG grant GR 3619/701, PHC PROCOPE and PICS07882 grants (to AC and VG); Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) grants GR 3619/15-1, GR 3619/16-1(to VG); SFB Consortium 1158-2 (to VG, SH and BD); French Japanese governments fellowship B-16012 JM/NH and Subsidy from Nukada Institute for Medical and Biological Research (to MI); Fyssen Foundation fellowship (to AL); Région Grand Est fellowship (to DK); DFG Postdoc Fellowship AL 2466/1-1 (to FA); the Foundation of Prader-Willi Research post-doctoral fellowship (to CPS and FA); DAAD Postdoc Short term research grant 57552337 (to RP); DFG Walter Benjamin Position – Projektnummer 459051339 (to QK). National Heart, Lung, and Blood Institute Grant NIH HL090948, National Institute of Neurological Disorders and Stroke Grant NIH NS094640, and funding provided by the Center for Neuroinflammation and Cardiometabolic Diseases (CNCD) at Georgia State University (to JES). The authors thank Prof. Yulong Li for providing the GRABOTR plasmid, Drs. Romain Goutagny and Vincent Douchamps for in vivo electrophysiology advices, the Chronobiotron UMS 3415 for all animal care and the technical plateau ComptOpt UPR 3212 for behavior technical assistance.
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Affiliation(s)
- Mai Iwasaki
- Centre National de la Recherche Scientifique and University of Strasbourg, Institute of Cellular and Integrative Neuroscience, 67000, Strasbourg, France
| | - Arthur Lefevre
- Centre National de la Recherche Scientifique and University of Strasbourg, Institute of Cellular and Integrative Neuroscience, 67000, Strasbourg, France
- Department of Neuropeptide Research in Psychiatry, Central Institute of Mental Health, University of Heidelberg, Mannheim, 68159, Germany
- Cortical Systems and Behavior Laboratory, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Ferdinand Althammer
- Department of Neuropeptide Research in Psychiatry, Central Institute of Mental Health, University of Heidelberg, Mannheim, 68159, Germany
- Center for Neuroinflammation and Cardiometabolic Diseases, Georgia State University, Atlanta, USA
- Institute of Human Genetics, University Hospital Heidelberg, Heidelberg, Germany
| | - Etienne Clauss Creusot
- Centre National de la Recherche Scientifique and University of Strasbourg, Institute of Cellular and Integrative Neuroscience, 67000, Strasbourg, France
| | - Olga Łąpieś
- Centre National de la Recherche Scientifique and University of Strasbourg, Institute of Cellular and Integrative Neuroscience, 67000, Strasbourg, France
| | - Hugues Petitjean
- Centre National de la Recherche Scientifique and University of Strasbourg, Institute of Cellular and Integrative Neuroscience, 67000, Strasbourg, France
| | - Louis Hilfiger
- Centre National de la Recherche Scientifique and University of Strasbourg, Institute of Cellular and Integrative Neuroscience, 67000, Strasbourg, France
| | - Damien Kerspern
- Centre National de la Recherche Scientifique and University of Strasbourg, Institute of Cellular and Integrative Neuroscience, 67000, Strasbourg, France
| | - Meggane Melchior
- Centre National de la Recherche Scientifique and University of Strasbourg, Institute of Cellular and Integrative Neuroscience, 67000, Strasbourg, France
| | - Stephanie Küppers
- Department of Neuropeptide Research in Psychiatry, Central Institute of Mental Health, University of Heidelberg, Mannheim, 68159, Germany
| | - Quirin Krabichler
- Department of Neuropeptide Research in Psychiatry, Central Institute of Mental Health, University of Heidelberg, Mannheim, 68159, Germany
| | - Ryan Patwell
- Department of Neuropeptide Research in Psychiatry, Central Institute of Mental Health, University of Heidelberg, Mannheim, 68159, Germany
| | - Alan Kania
- Department of Neuropeptide Research in Psychiatry, Central Institute of Mental Health, University of Heidelberg, Mannheim, 68159, Germany
| | - Tim Gruber
- Van Andel Institute, Grand Rapids, MI, USA
| | - Matthew K Kirchner
- Center for Neuroinflammation and Cardiometabolic Diseases, Georgia State University, Atlanta, USA
| | - Moritz Wimmer
- Institute of Human Genetics, University Hospital Heidelberg, Heidelberg, Germany
| | - Henning Fröhlich
- Institute of Human Genetics, University Hospital Heidelberg, Heidelberg, Germany
| | - Laura Dötsch
- Institute of Human Genetics, University Hospital Heidelberg, Heidelberg, Germany
| | - Jonas Schimmer
- Department of Neuropeptide Research in Psychiatry, Central Institute of Mental Health, University of Heidelberg, Mannheim, 68159, Germany
| | - Sabine C Herpertz
- Department of General Psychiatry, Center of Psychosocial Medicine, University of Heidelberg, 69115, Heidelberg, Germany
| | - Beate Ditzen
- Institute of Medical Psychology, Heidelberg University Hospital, 69115, Heidelberg, Germany
- Ruprecht-Karls University Heidelberg, Heidelberg, Germany
| | - Christian P Schaaf
- Institute of Human Genetics, University Hospital Heidelberg, Heidelberg, Germany
- Ruprecht-Karls University Heidelberg, Heidelberg, Germany
| | - Kai Schönig
- Department of Molecular Biology, Central Institute of Mental Health, University of Heidelberg, Mannheim, 68159, Germany
| | - Dusan Bartsch
- Department of Molecular Biology, Central Institute of Mental Health, University of Heidelberg, Mannheim, 68159, Germany
| | - Anna Gugula
- Department of Neurophysiology and Chronobiology, Institute of Zoology and Biomedical Research, Faculty of Biology, Jagiellonian University, Krakow, 30-387, Poland
| | - Aleksandra Trenk
- Department of Neurophysiology and Chronobiology, Institute of Zoology and Biomedical Research, Faculty of Biology, Jagiellonian University, Krakow, 30-387, Poland
| | - Anna Blasiak
- Department of Neurophysiology and Chronobiology, Institute of Zoology and Biomedical Research, Faculty of Biology, Jagiellonian University, Krakow, 30-387, Poland
| | - Javier E Stern
- Center for Neuroinflammation and Cardiometabolic Diseases, Georgia State University, Atlanta, USA
| | - Pascal Darbon
- Centre National de la Recherche Scientifique and University of Strasbourg, Institute of Cellular and Integrative Neuroscience, 67000, Strasbourg, France
| | - Valery Grinevich
- Department of Neuropeptide Research in Psychiatry, Central Institute of Mental Health, University of Heidelberg, Mannheim, 68159, Germany.
- Center for Neuroinflammation and Cardiometabolic Diseases, Georgia State University, Atlanta, USA.
| | - Alexandre Charlet
- Centre National de la Recherche Scientifique and University of Strasbourg, Institute of Cellular and Integrative Neuroscience, 67000, Strasbourg, France.
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Petitjean H, Héberlé E, Hilfiger L, Łapieś O, Rodrigue G, Charlet A. TRP channels and monoterpenes: Past and current leads on analgesic properties. Front Mol Neurosci 2022; 15:945450. [PMID: 35966017 PMCID: PMC9373873 DOI: 10.3389/fnmol.2022.945450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 07/04/2022] [Indexed: 11/13/2022] Open
Abstract
The activation of the transient receptor potential (TRP) channels expressed by sensory neurons is essential to the transduction of thermal and mechanical sensory information. In the setting of chronic inflammatory conditions, the activation of the melastatin family member 8 (TRPM8), the TRP vanilloid 1 (TRPV1), and the TRP ankyrin 1 (TRPA1) is correlated with pain hypersensitivity reactions. Monoterpenes, among which pulegone and menthol, a major class of phytocompounds present in essential oils of medicinal plants, are known modulators of those TRP channels activity. In the present review, we correlate the monoterpene content of plants with their historical therapeutic properties. We then describe how monoterpenes exert their anti-inflammatory and antihyperalgesia effects through modulation of TRP channels activity. Finally, we discuss the importance and the potential of characterizing new plant extracts and reassessing studied plant extracts for the development of ethnopharmacology-based innovative treatments for chronic pain. This review suggests that monoterpene solutions, based on composition from traditional healing herbs, offer an interesting avenue for the development of new phytotherapeutic treatments to alleviate chronic inflammatory pain conditions.
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Affiliation(s)
| | | | - Louis Hilfiger
- Benephyt, Strasbourg, France
- Centre National de la Recherche Scientifique, University of Strasbourg, Institute of Cellular and Integrative Neuroscience, INCI UPR3212, Strasbourg, France
| | - Olga Łapieś
- Centre National de la Recherche Scientifique, University of Strasbourg, Institute of Cellular and Integrative Neuroscience, INCI UPR3212, Strasbourg, France
| | | | - Alexandre Charlet
- Centre National de la Recherche Scientifique, University of Strasbourg, Institute of Cellular and Integrative Neuroscience, INCI UPR3212, Strasbourg, France
- *Correspondence: Alexandre Charlet
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5
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Hilfiger L, Triaux Z, Marcic C, Héberlé E, Emhemmed F, Darbon P, Marchioni E, Petitjean H, Charlet A. Anti-Hyperalgesic Properties of Menthol and Pulegone. Front Pharmacol 2021; 12:753873. [PMID: 34916937 PMCID: PMC8670501 DOI: 10.3389/fphar.2021.753873] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 10/29/2021] [Indexed: 12/30/2022] Open
Abstract
Context: Menthol, the main monoterpene found in Mentha piperita L. (M. piperita) is known to modulate nociceptive threshold and is present in different curative preparations that reduce sensory hypersensitivities in pain conditions. While for pulegone, a menthol-like monoterpene, only a limited number of studies focus on its putative analgesic effects, pulegone is the most abundant monoterpene present in Calamintha nepeta (L.) Savi (C. nepeta), a plant of the Lamiaceae family used in traditional medicine to alleviate rheumatic disorders, which counts amongst chronic inflammatory diseases. Objectives: Here, we analyzed the monoterpenes composition of C. nepeta and M. piperita. We then compared the putative anti-hyperalgesic effects of the main monoterpenes found, menthol and pulegone, in acute inflammatory pain conditions. Methods:C. nepeta and M. piperita extracts were obtained through pressurized liquid extraction and analyzed by gas chromatography-mass spectrometry. The in vitro anti-inflammatory activity of menthol or pulegone was evaluated by measuring the secretion of the tumour necrosis factor alpha (TNF α) from LPS-stimulated THP-1 cells. The in vivo anti-hyperalgesic effects of menthol and pulegone were tested on a rat inflammatory pain model. Results: Pulegone and menthol are the most abundant monoterpene found in C. nepeta (49.41%) and M. piperita (42.85%) extracts, respectively. In vitro, both pulegone and menthol act as strong anti-inflammatory molecules, with EC50 values of 1.2 ± 0.2 and 1.5 ± 0.1 mM, respectively, and exert cytotoxicity with EC50 values of 6.6 ± 0.3 and 3.5 ± 0.2 mM, respectively. In vivo, 100 mg/kg pulegone exerts a transient anti-hyperalgesic effect on both mechanical (pulegone: 274.25 ± 68.89 g, n = 8; vehicle: 160.88 ± 35.17 g, n = 8, p < 0.0001), thermal heat (pulegone: 4.09 ± 0.62 s, n = 8; vehicle: 2.25 ± 0.34 s, n = 8, p < 0.0001), and cold (pulegone: 2.25 ± 1.28 score, n = 8; vehicle: 4.75 ± 1.04 score, n = 8, p = 0.0003). In a similar way, 100 mg/kg menthol exerts a transient anti-hyperalgesic effect on both mechanical (mechanical: menthol: 281.63 ± 45.52 g, n = 8; vehicle: 166.25 ± 35.4 g, n = 8, p < 0.0001) and thermal heat (menthol: 3.65 ± 0.88 s, n = 8; vehicle: 2.19 ± 0.26 s, n = 8, <0.0001). Conclusion: Here, we show that both pulegone and menthol are anti-inflammatory and anti-hyperalgesic monoterpenes. These results might open the path towards new compound mixes to alleviate the pain sensation.
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Affiliation(s)
- Louis Hilfiger
- Benephyt, Strasbourg, France.,Centre National de la Recherche Scientifique, University of Strasbourg, Institute of Cellular and Integrative Neurosciences, INCI UPR3212, Strasbourg, France
| | - Zélie Triaux
- Benephyt, Strasbourg, France.,Centre National de la Recherche Scientifique, University of Strasbourg, Institut Pluridisciplinaire Hubert Curien, IPHC UMR, Strasbourg, France
| | - Christophe Marcic
- Centre National de la Recherche Scientifique, University of Strasbourg, Institut Pluridisciplinaire Hubert Curien, IPHC UMR, Strasbourg, France
| | | | - Fathi Emhemmed
- Centre National de la Recherche Scientifique, University of Strasbourg, Institut Pluridisciplinaire Hubert Curien, IPHC UMR, Strasbourg, France
| | - Pascal Darbon
- Centre National de la Recherche Scientifique, University of Strasbourg, Institute of Cellular and Integrative Neurosciences, INCI UPR3212, Strasbourg, France
| | - Eric Marchioni
- Centre National de la Recherche Scientifique, University of Strasbourg, Institut Pluridisciplinaire Hubert Curien, IPHC UMR, Strasbourg, France
| | | | - Alexandre Charlet
- Centre National de la Recherche Scientifique, University of Strasbourg, Institute of Cellular and Integrative Neurosciences, INCI UPR3212, Strasbourg, France
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6
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Tran D, Petitjean H, Chebli Y, Geitmann A, Sharif-Naeini R. Mechanosensitive ion channels contribute to mechanically evoked rapid leaflet movement in Mimosa pudica. Plant Physiol 2021; 187:1704-1712. [PMID: 34734277 PMCID: PMC8566232 DOI: 10.1093/plphys/kiab333] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 05/26/2021] [Indexed: 05/30/2023]
Abstract
Mechanoperception, the ability to perceive and respond to mechanical stimuli, is a common and fundamental property of all forms of life. Vascular plants such as Mimosa pudica use this function to protect themselves against herbivory. The mechanical stimulus caused by a landing insect triggers a rapid closing of the leaflets that drives the potential pest away. While this thigmonastic movement is caused by ion fluxes accompanied by a rapid change of volume in the pulvini, the mechanism responsible for the detection of the mechanical stimulus remains poorly understood. Here, we examined the role of mechanosensitive ion channels in the first step of this evolutionarily conserved defense mechanism: the mechanically evoked closing of the leaflet. Our results demonstrate that the key site of mechanosensation in the Mimosa leaflets is the pulvinule, which expresses a stretch-activated chloride-permeable mechanosensitive ion channel. Blocking these channels partially prevents the closure of the leaflets following mechanical stimulation. These results demonstrate a direct relation between the activity of mechanosensitive ion channels and a central defense mechanism of M. pudica.
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Affiliation(s)
- Daniel Tran
- Department of Physiology and Cell Information Systems, McGill University, Promenade Sir William Osler, Montreal, Québec, Canada H3G0B1
| | - Hugues Petitjean
- Department of Physiology and Cell Information Systems, McGill University, Promenade Sir William Osler, Montreal, Québec, Canada H3G0B1
| | - Youssef Chebli
- Department of Plant Science, McGill University, Ste-Anne-de-Bellevue, Quebec, Canada H9X3V9
| | - Anja Geitmann
- Department of Plant Science, McGill University, Ste-Anne-de-Bellevue, Quebec, Canada H9X3V9
| | - Reza Sharif-Naeini
- Department of Physiology and Cell Information Systems, McGill University, Promenade Sir William Osler, Montreal, Québec, Canada H3G0B1
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7
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Triaux Z, Petitjean H, Marchioni E, Steyer D, Marcic C. Comparison of Headspace, Hydrodistillation and Pressurized Liquid Extraction of Terpenes and Terpenoids from Food Matrices—Qualitative and Quantitative Analysis. J Anal Chem 2021. [DOI: 10.1134/s1061934821030151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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8
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Triaux Z, Petitjean H, Marchioni E, Boltoeva M, Marcic C. Deep eutectic solvent–based headspace single-drop microextraction for the quantification of terpenes in spices. Anal Bioanal Chem 2020; 412:933-948. [DOI: 10.1007/s00216-019-02317-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 11/19/2019] [Accepted: 12/03/2019] [Indexed: 01/22/2023]
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Abstract
In this issue of Neuron, Pagani et al. (2019) find that itch signaling occurs only when GRP neurons fire action potentials in bursts. This enables GRP release and the activation of GRPR neurons, which help carry the itch signal to the brain.
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Affiliation(s)
- Hugues Petitjean
- Department of Physiology and Cell Information Systems, McGill University, Montreal, QC, Canada; The Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
| | - Philippe Séguéla
- The Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada; Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
| | - Reza Sharif-Naeini
- Department of Physiology and Cell Information Systems, McGill University, Montreal, QC, Canada; The Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada.
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10
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Petitjean H, Bourojeni FB, Tsao D, Davidova A, Sotocinal SG, Mogil JS, Kania A, Sharif-Naeini R. Recruitment of Spinoparabrachial Neurons by Dorsal Horn Calretinin Neurons. Cell Rep 2019; 28:1429-1438.e4. [DOI: 10.1016/j.celrep.2019.07.048] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 06/13/2019] [Accepted: 07/15/2019] [Indexed: 01/11/2023] Open
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11
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Bonnel C, Legrand B, Bantignies JL, Petitjean H, Martinez J, Masurier N, Maillard LT. FT-IR and NMR structural markers for thiazole-based γ-peptide foldamers. Org Biomol Chem 2018; 14:8664-8669. [PMID: 27714174 DOI: 10.1039/c6ob01594h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Nuclear magnetic resonance (NMR) spectroscopy has been established as a potent method for the determination of foldamer structures in solution. However, the NMR techniques could be limited by averaging, so additional experimental techniques are often needed to fully endorse the folding properties of a sequence. We have recently demonstrated that oligo-γ-peptides composed of 4-amino(methyl)-1,3-thiazole-5-carboxylic acids (ATCs) adopt an original helical fold stabilized by hydrogen bonds forming C9 pseudocycles. The main objective of the present work is to reinvestigate the folding of ATC oligomer 1 in order to identify reliable FT-IR and NMR structural markers that are of value for tracking the degree of organization of ATC-based peptides.
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Affiliation(s)
- C Bonnel
- Institut des Biomolécules Max Mousseron, UMR 5247, Université de Montpellier, CNRS, ENSCM, UFR des Sciences Pharmaceutiques et Biologiques, 15 Avenue Charles Flahault, 34093 Montpellier Cedex 5, France.
| | - B Legrand
- Institut des Biomolécules Max Mousseron, UMR 5247, Université de Montpellier, CNRS, ENSCM, UFR des Sciences Pharmaceutiques et Biologiques, 15 Avenue Charles Flahault, 34093 Montpellier Cedex 5, France.
| | - J-L Bantignies
- LC2 - UMR 5221 Université de Montpellier, CNRS, Place Eugène Bataillon, 34095 Montpellier, France
| | - H Petitjean
- Institut Charles Gerhardt, UMR 5253 CNRS/ENSCM/UM, Matériaux Avancés pour la Catalyse et la Santé, Ecole Nationale Supérieure de Chimie, 8 rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France
| | - J Martinez
- Institut des Biomolécules Max Mousseron, UMR 5247, Université de Montpellier, CNRS, ENSCM, UFR des Sciences Pharmaceutiques et Biologiques, 15 Avenue Charles Flahault, 34093 Montpellier Cedex 5, France.
| | - N Masurier
- Institut des Biomolécules Max Mousseron, UMR 5247, Université de Montpellier, CNRS, ENSCM, UFR des Sciences Pharmaceutiques et Biologiques, 15 Avenue Charles Flahault, 34093 Montpellier Cedex 5, France.
| | - L T Maillard
- Institut des Biomolécules Max Mousseron, UMR 5247, Université de Montpellier, CNRS, ENSCM, UFR des Sciences Pharmaceutiques et Biologiques, 15 Avenue Charles Flahault, 34093 Montpellier Cedex 5, France.
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12
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Petitjean H, Pawlowski SA, Fraine SL, Sharif B, Hamad D, Fatima T, Berg J, Brown CM, Jan LY, Ribeiro-da-Silva A, Braz JM, Basbaum AI, Sharif-Naeini R. Dorsal Horn Parvalbumin Neurons Are Gate-Keepers of Touch-Evoked Pain after Nerve Injury. Cell Rep 2015; 13:1246-1257. [PMID: 26527000 PMCID: PMC6038918 DOI: 10.1016/j.celrep.2015.09.080] [Citation(s) in RCA: 194] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 09/04/2015] [Accepted: 09/25/2015] [Indexed: 01/01/2023] Open
Abstract
Neuropathic pain is a chronic debilitating disease that results from nerve damage, persists long after the injury has subsided, and is characterized by spontaneous pain and mechanical hypersensitivity. Although loss of inhibitory tone in the dorsal horn of the spinal cord is a major contributor to neuropathic pain, the molecular and cellular mechanisms underlying this disinhibition are unclear. Here, we combined pharmacogenetic activation and selective ablation approaches in mice to define the contribution of spinal cord parvalbumin (PV)-expressing inhibitory interneurons in naive and neuropathic pain conditions. Ablating PV neurons in naive mice produce neuropathic pain-like mechanical allodynia via disinhibition of PKCγ excitatory interneurons. Conversely, activating PV neurons in nerve-injured mice alleviates mechanical hypersensitivity. These findings indicate that PV interneurons are modality-specific filters that gate mechanical but not thermal inputs to the dorsal horn and that increasing PV inter-neuron activity can ameliorate the mechanical hypersensitivity that develops following nerve injury.
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Affiliation(s)
- Hugues Petitjean
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada
| | | | - Steven Li Fraine
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada
| | - Behrang Sharif
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada
| | - Doulia Hamad
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada
| | - Tarheen Fatima
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada
| | - Jim Berg
- Departments of Physiology and Biochemistry, Howard Hughes Medical Institute, University of California, San Francisco, 1550 4th Street, RH-490D, San Francisco, CA 94158, USA
| | - Claire M Brown
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada; Advanced BioImaging Facility, McGill University, H3G0B1 QC, Canada
| | - Lily-Yeh Jan
- Departments of Physiology and Biochemistry, Howard Hughes Medical Institute, University of California, San Francisco, 1550 4th Street, RH-490D, San Francisco, CA 94158, USA
| | - Alfredo Ribeiro-da-Silva
- Department of Pharmacology and Therapeutics, McGill University, H3G1Y6 QC, Canada; Department of Anatomy and Cell Biology, McGill University, H3A0C7 QC, Canada
| | - Joao M Braz
- Department of Anatomy, University of California, San Francisco, 1550 4th Street, RH-348E, San Francisco, CA 94158, USA
| | - Allan I Basbaum
- Department of Anatomy, University of California, San Francisco, 1550 4th Street, RH-348E, San Francisco, CA 94158, USA
| | - Reza Sharif-Naeini
- Department of Physiology and Cell Information Systems Group, McGill University, Montreal, H3G0B1 QC, Canada.
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Schauer C, Tong T, Petitjean H, Blum T, Peron S, Mai O, Schmitz F, Boehm U, Leinders-Zufall T. Hypothalamic gonadotropin-releasing hormone (GnRH) receptor neurons fire in synchrony with the female reproductive cycle. J Neurophysiol 2015; 114:1008-21. [PMID: 26063780 DOI: 10.1152/jn.00357.2015] [Citation(s) in RCA: 12] [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: 04/10/2015] [Accepted: 06/09/2015] [Indexed: 11/22/2022] Open
Abstract
Gonadotropin-releasing hormone (GnRH) controls mammalian reproduction via the hypothalamic-pituitary-gonadal (hpg) axis, acting on gonadotrope cells in the pituitary gland that express the GnRH receptor (GnRHR). Cells expressing the GnRHR have also been identified in the brain. However, the mechanism by which GnRH acts on these potential target cells remains poorly understood due to the difficulty of visualizing and identifying living GnRHR neurons in the central nervous system. We have developed a mouse strain in which GnRHR neurons express a fluorescent marker, enabling the reliable identification of these cells independent of the hormonal status of the animal. In this study, we analyze the GnRHR neurons of the periventricular hypothalamic nucleus in acute brain slices prepared from adult female mice. Strikingly, we find that the action potential firing pattern of these neurons alternates in synchrony with the estrous cycle, with pronounced burst firing during the preovulatory period. We demonstrate that GnRH stimulation is sufficient to trigger the conversion from tonic to burst firing in GnRHR neurons. Furthermore, we show that this switch in the firing pattern is reversed by a potent GnRHR antagonist. These data suggest that endogenous GnRH acts on GnRHR neurons and triggers burst firing in these cells during late proestrus and estrus. Our data have important clinical implications in that they indicate a novel mode of action for GnRHR agonists and antagonists in neurons of the central nervous system that are not part of the classical hpg axis.
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Affiliation(s)
- Christian Schauer
- Department of Physiology and Center for Integrative Physiology and Molecular Medicine, University of Saarland School of Medicine, Homburg, Germany
| | - Tong Tong
- Department of Physiology and Center for Integrative Physiology and Molecular Medicine, University of Saarland School of Medicine, Homburg, Germany
| | - Hugues Petitjean
- Department of Physiology and Center for Integrative Physiology and Molecular Medicine, University of Saarland School of Medicine, Homburg, Germany
| | - Thomas Blum
- Department of Physiology and Center for Integrative Physiology and Molecular Medicine, University of Saarland School of Medicine, Homburg, Germany
| | - Sophie Peron
- Department of Physiology and Center for Integrative Physiology and Molecular Medicine, University of Saarland School of Medicine, Homburg, Germany
| | - Oliver Mai
- Department of Pharmacology and Toxicology, University of Saarland School of Medicine, Homburg, Germany; and
| | - Frank Schmitz
- Department of Anatomy, University of Saarland School of Medicine, Homburg, Germany
| | - Ulrich Boehm
- Department of Pharmacology and Toxicology, University of Saarland School of Medicine, Homburg, Germany; and
| | - Trese Leinders-Zufall
- Department of Physiology and Center for Integrative Physiology and Molecular Medicine, University of Saarland School of Medicine, Homburg, Germany;
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Petitjean H, Hugel S, Barthas F, Bohren Y, Barrot M, Yalcin I, Schlichter R. Activation of transient receptor potential vanilloid 2-expressing primary afferents stimulates synaptic transmission in the deep dorsal horn of the rat spinal cord and elicits mechanical hyperalgesia. Eur J Neurosci 2014; 40:3189-201. [PMID: 25104469 DOI: 10.1111/ejn.12688] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [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: 01/13/2014] [Revised: 05/30/2014] [Accepted: 07/10/2014] [Indexed: 11/29/2022]
Abstract
Probenecid, an agonist of transient receptor vanilloid (TRPV) type 2, was used to evaluate the effects of TRPV2 activation on excitatory and inhibitory synaptic transmission in the dorsal horn (DH) of the rat spinal cord and on nociceptive reflexes induced by thermal heat and mechanical stimuli. The effects of probenecid were compared with those of capsaicin, a TRPV1 agonist. Calcium imaging experiments on rat dorsal root ganglion (DRG) and DH cultures indicated that functional TRPV2 and TRPV1 were expressed by essentially non-overlapping subpopulations of DRG neurons, but were absent from DH neurons and DH and DRG glial cells. Pretreatment of DRG cultures with small interfering RNAs against TRPV2 suppressed the responses to probenecid. Patch-clamp recordings from spinal cord slices showed that probenecid and capsaicin increased the frequencies of spontaneous excitatory postsynaptic currents (sEPSCs) and spontaneous inhibitory postsynaptic currents in a subset of laminae III-V neurons. In contrast to capsaicin, probenecid failed to stimulate synaptic transmission in lamina II. Intrathecal or intraplantar injections of probenecid induced mechanical hyperalgesia/allodynia without affecting nociceptive heat responses. Capsaicin induced both mechanical hyperalgesia/allodynia and heat hyperalgesia. Activation of TRPV1 or TRPV2 in distinct sets of primary afferents increased the sEPSC frequencies in a largely common population of DH neurons in laminae III-V, and might underlie the development of mechanical hypersensitivity following probenecid or capsaicin treatment. However, only TRPV1-expressing afferents facilitated excitatory and/or inhibitory transmission in a subpopulation of lamina II neurons, and this phenomenon might be correlated with the induction of thermal heat hyperalgesia.
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Affiliation(s)
- Hugues Petitjean
- Institut des Neurosciences Cellulaires et Integratives, UPR 3212 Centre National de la Recherche Scientifique, Strasbourg, France; Universite de Strasbourg, 5 rue Blaise Pascal, F-67084, Strasbourg, France
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Petitjean H, Rodeau JL, Schlichter R. Interactions between superficial and deep dorsal horn spinal cord neurons in the processing of nociceptive information. Eur J Neurosci 2012; 36:3500-8. [DOI: 10.1111/j.1460-9568.2012.08273.x] [Citation(s) in RCA: 12] [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] [Indexed: 11/28/2022]
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Bélaïche J, Nurit Y, Petitjean H, Pignon JP, Charasz N, Dervichian M, Joly JP, Cattan D. [Occurrence of alcoholic macrocytosis in a hospital in the Paris area. 1-year prospective study]. Gastroenterol Clin Biol 1984; 8:199-200. [PMID: 6698360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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17
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Leclerc FP, Petitjean H, Autissier JM, Briet S, Repolt A. [Recent closed injuries of the pancreas and their emergency treatment]. Lyon Chir 1966; 62:670-5. [PMID: 5974870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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