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Tu NH, Inoue K, Lewis PK, Khan A, Hwang JH, Chokshi V, Dabovic BB, Selvaraj S, Bhattacharya A, Dubeykovskaya Z, Pinkerton NM, Bunnett NW, Loomis CA, Albertson DG, Schmidt BL. Calcitonin Related Polypeptide Alpha Mediates Oral Cancer Pain. Cells 2023; 12:1675. [PMID: 37443709 PMCID: PMC10341289 DOI: 10.3390/cells12131675] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 07/15/2023] Open
Abstract
Oral cancer patients suffer pain at the site of the cancer. Calcitonin gene related polypeptide (CGRP), a neuropeptide expressed by a subset of primary afferent neurons, promotes oral cancer growth. CGRP also mediates trigeminal pain (migraine) and neurogenic inflammation. The contribution of CGRP to oral cancer pain is investigated in the present study. The findings demonstrate that CGRP-immunoreactive (-ir) neurons and neurites innervate orthotopic oral cancer xenograft tumors in mice. Cancer increases anterograde transport of CGRP in axons innervating the tumor, supporting neurogenic secretion as the source of CGRP in the oral cancer microenvironment. CGRP antagonism reverses oral cancer nociception in preclinical oral cancer pain models. Single-cell RNA-sequencing is used to identify cell types in the cancer microenvironment expressing the CGRP receptor components, receptor activity modifying protein 1 Ramp1 and calcitonin receptor like receptor (CLR, encoded by Calcrl). Ramp1 and Calcrl transcripts are detected in cells expressing marker genes for Schwann cells, endothelial cells, fibroblasts and immune cells. Ramp1 and Calcrl transcripts are more frequently detected in cells expressing fibroblast and immune cell markers. This work identifies CGRP as mediator of oral cancer pain and suggests the antagonism of CGRP to alleviate oral cancer pain.
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Affiliation(s)
- Nguyen Huu Tu
- Department of Oral and Maxillofacial Surgery, Translational Research Center, New York University College of Dentistry, New York, NY 10010, USA; (N.H.T.); (K.I.); (A.K.); (J.H.H.); (V.C.); (A.B.); (Z.D.)
| | - Kenji Inoue
- Department of Oral and Maxillofacial Surgery, Translational Research Center, New York University College of Dentistry, New York, NY 10010, USA; (N.H.T.); (K.I.); (A.K.); (J.H.H.); (V.C.); (A.B.); (Z.D.)
| | - Parker K. Lewis
- Department of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, New York, NY 10010, USA; (P.K.L.); (N.M.P.)
| | - Ammar Khan
- Department of Oral and Maxillofacial Surgery, Translational Research Center, New York University College of Dentistry, New York, NY 10010, USA; (N.H.T.); (K.I.); (A.K.); (J.H.H.); (V.C.); (A.B.); (Z.D.)
| | - Jun Hyeong Hwang
- Department of Oral and Maxillofacial Surgery, Translational Research Center, New York University College of Dentistry, New York, NY 10010, USA; (N.H.T.); (K.I.); (A.K.); (J.H.H.); (V.C.); (A.B.); (Z.D.)
| | - Varun Chokshi
- Department of Oral and Maxillofacial Surgery, Translational Research Center, New York University College of Dentistry, New York, NY 10010, USA; (N.H.T.); (K.I.); (A.K.); (J.H.H.); (V.C.); (A.B.); (Z.D.)
| | - Branka Brukner Dabovic
- Department of Pathology, NYU Langone Health, New York, NY 10010, USA; (B.B.D.); (S.S.); (C.A.L.)
| | - Shanmugapriya Selvaraj
- Department of Pathology, NYU Langone Health, New York, NY 10010, USA; (B.B.D.); (S.S.); (C.A.L.)
| | - Aditi Bhattacharya
- Department of Oral and Maxillofacial Surgery, Translational Research Center, New York University College of Dentistry, New York, NY 10010, USA; (N.H.T.); (K.I.); (A.K.); (J.H.H.); (V.C.); (A.B.); (Z.D.)
| | - Zinaida Dubeykovskaya
- Department of Oral and Maxillofacial Surgery, Translational Research Center, New York University College of Dentistry, New York, NY 10010, USA; (N.H.T.); (K.I.); (A.K.); (J.H.H.); (V.C.); (A.B.); (Z.D.)
| | - Nathalie M. Pinkerton
- Department of Chemical and Biomolecular Engineering, New York University Tandon School of Engineering, New York, NY 10010, USA; (P.K.L.); (N.M.P.)
| | - Nigel W. Bunnett
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA;
- Department of Neuroscience and Physiology, Neuroscience Institute, NYU Langone Health, New York, NY 10016, USA
- NYU Pain Research Center, New York University College of Dentistry, New York, NY 10010, USA
| | - Cynthia A. Loomis
- Department of Pathology, NYU Langone Health, New York, NY 10010, USA; (B.B.D.); (S.S.); (C.A.L.)
| | - Donna G. Albertson
- Department of Oral and Maxillofacial Surgery, Translational Research Center, New York University College of Dentistry, New York, NY 10010, USA; (N.H.T.); (K.I.); (A.K.); (J.H.H.); (V.C.); (A.B.); (Z.D.)
- NYU Pain Research Center, New York University College of Dentistry, New York, NY 10010, USA
| | - Brian L. Schmidt
- Department of Oral and Maxillofacial Surgery, Translational Research Center, New York University College of Dentistry, New York, NY 10010, USA; (N.H.T.); (K.I.); (A.K.); (J.H.H.); (V.C.); (A.B.); (Z.D.)
- Department of Neuroscience and Physiology, Neuroscience Institute, NYU Langone Health, New York, NY 10016, USA
- NYU Pain Research Center, New York University College of Dentistry, New York, NY 10010, USA
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2
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Li K, Tsukasa Y, Kurio M, Maeta K, Tsumadori A, Baba S, Nishimura R, Murakami A, Onodera K, Morimoto T, Uemura T, Usui T. Belly roll, a GPI-anchored Ly6 protein, regulates Drosophila melanogaster escape behaviors by modulating the excitability of nociceptive peptidergic interneurons. eLife 2023; 12:83856. [PMID: 37309249 DOI: 10.7554/elife.83856] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 05/13/2023] [Indexed: 06/14/2023] Open
Abstract
Appropriate modulation of escape behaviors in response to potentially damaging stimuli is essential for survival. Although nociceptive circuitry has been studied, it is poorly understood how genetic contexts affect relevant escape responses. Using an unbiased genome-wide association analysis, we identified an Ly6/α-neurotoxin family protein, Belly roll (Bero), which negatively regulates Drosophila nociceptive escape behavior. We show that Bero is expressed in abdominal leucokinin-producing neurons (ABLK neurons) and bero knockdown in ABLK neurons resulted in enhanced escape behavior. Furthermore, we demonstrated that ABLK neurons responded to activation of nociceptors and initiated the behavior. Notably, bero knockdown reduced persistent neuronal activity and increased evoked nociceptive responses in ABLK neurons. Our findings reveal that Bero modulates an escape response by regulating distinct neuronal activities in ABLK neurons.
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Affiliation(s)
- Kai Li
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Yuma Tsukasa
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Misato Kurio
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Kaho Maeta
- Faculty of Agriculture, Kyoto University, Kyoto, Japan
| | | | - Shumpei Baba
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Risa Nishimura
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | | | - Koun Onodera
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Takako Morimoto
- School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Kyoto, Japan
| | - Tadashi Uemura
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
- Research Center for Dynamic Living Systems, Kyoto University, Kyoto, Japan
| | - Tadao Usui
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
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3
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Gabery S, Ahmed RM, Caga J, Kiernan MC, Halliday GM, Petersén Å. Loss of the metabolism and sleep regulating neuronal populations expressing orexin and oxytocin in the hypothalamus in amyotrophic lateral sclerosis. Neuropathol Appl Neurobiol 2021; 47:979-989. [PMID: 33755993 DOI: 10.1111/nan.12709] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [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: 01/04/2021] [Revised: 03/14/2021] [Accepted: 03/15/2021] [Indexed: 12/12/2022]
Abstract
AIMS To determine the underlying cellular changes and clinical correlates associated with pathology of the hypothalamus in amyotrophic lateral sclerosis (ALS), as hypothalamic atrophy occurs in the preclinical phase of the disease. METHODS The hypothalamus was pathologically examined in nine patients with amyotrophic lateral sclerosis in comparison to eight healthy control subjects. The severity of regional atrophy (paraventricular nucleus: PVN, fornix and total hypothalamus) and peptidergic neuronal loss (oxytocin, vasopressin, cocaine- and amphetamine-regulating transcript: CART, and orexin) was correlated with changes in eating behaviour, sleep function, cognition, behaviour and disease progression. RESULTS Tar DNA-binding protein 43 (TDP-43) inclusions were present in the hypothalamus of all patients with amyotrophic lateral sclerosis. When compared to controls, there was atrophy of the hypothalamus (average 21% atrophy, p = 0.004), PVN (average 30% atrophy p = 0.014) and a loss of paraventricular oxytocin-producing neurons (average 49% loss p = 0.02) and lateral hypothalamic orexin-producing neurons (average 37% loss, significance p = 0.02). Factor analysis identified strong relationships between abnormal eating behaviour, hypothalamic atrophy and loss of orexin-producing neurons. With increasing disease progression, abnormal sleep behaviour and cognition associated with atrophy of the fornix. CONCLUSIONS Substantial loss of hypothalamic oxytocin-producing neurons occurs in ALS, with regional atrophy and the loss of orexin neurons relating to abnormal eating behaviour in ALS. Oxytocin- and orexin neurons display TDP43 inclusions. Our study points to significant pathology in the hypothalamus that may play a key role in metabolic and pathogenic changes in ALS.
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Affiliation(s)
- Sanaz Gabery
- Translational Neuroendocrine Research Unit, Department of Experimental Medical Science, Lund University, Lund, Sweden
| | - Rebekah M Ahmed
- Memory and Cognition Clinic, Department of Clinical Neurosciences, Royal Prince Alfred Hospital, Sydney, NSW, Australia.,Brain & Mind Centre and Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Jashelle Caga
- Brain & Mind Centre and Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Matthew C Kiernan
- Memory and Cognition Clinic, Department of Clinical Neurosciences, Royal Prince Alfred Hospital, Sydney, NSW, Australia.,Brain & Mind Centre and Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Glenda M Halliday
- Brain & Mind Centre and Faculty of Medicine and Health, School of Medical Sciences, The University of Sydney, Sydney, NSW, Australia
| | - Åsa Petersén
- Translational Neuroendocrine Research Unit, Department of Experimental Medical Science, Lund University, Lund, Sweden
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4
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Hu Y, Wang C, Yang L, Pan G, Liu H, Yu G, Ye B. A Neural Basis for Categorizing Sensory Stimuli to Enhance Decision Accuracy. Curr Biol 2020; 30:4896-4909.e6. [PMID: 33065003 DOI: 10.1016/j.cub.2020.09.045] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 01/21/2020] [Revised: 08/08/2020] [Accepted: 09/14/2020] [Indexed: 11/15/2022]
Abstract
Sensory stimuli with graded intensities often lead to yes-or-no decisions on whether to respond to the stimuli. How this graded-to-binary conversion is implemented in the central nervous system (CNS) remains poorly understood. Here, we show that graded encodings of noxious stimuli are categorized in a decision-associated CNS region in Drosophila larvae, and then decoded by a group of peptidergic neurons for executing binary escape decisions. GABAergic inhibition gates weak nociceptive encodings from being decoded, whereas escalated amplification through the recruitment of second-order neurons boosts nociceptive encodings at intermediate intensities. These two modulations increase the detection accuracy by reducing responses to negligible stimuli whereas enhancing responses to intense stimuli. Our findings thus unravel a circuit mechanism that underlies accurate detection of harmful stimuli.
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Affiliation(s)
- Yujia Hu
- Life Sciences Institute and Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Congchao Wang
- Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Arlington, VA 22203, USA
| | - Limin Yang
- Life Sciences Institute and Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA; School of Medicine, Dalian University, Dalian, Liaoning 116622, China
| | - Geng Pan
- Life Sciences Institute and Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Hao Liu
- Life Sciences Institute and Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Guoqiang Yu
- Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Arlington, VA 22203, USA.
| | - Bing Ye
- Life Sciences Institute and Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA.
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5
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Ciglieri E, Vacca M, Ferrini F, Atteya MA, Aimar P, Ficarra E, Di Cataldo S, Merighi A, Salio C. Cytoarchitectural analysis of the neuron-to-glia association in the dorsal root ganglia of normal and diabetic mice. J Anat 2020; 237:988-997. [PMID: 32579747 DOI: 10.1111/joa.13252] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 04/23/2020] [Revised: 05/22/2020] [Accepted: 05/22/2020] [Indexed: 11/28/2022] Open
Abstract
Dorsal root ganglia (DRGs) host the somata of sensory neurons which convey information from the periphery to the central nervous system. These neurons have heterogeneous size and neurochemistry, and those of small-to-medium size, which play an important role in nociception, form two distinct subpopulations based on the presence (peptidergic) or absence (non-peptidergic) of transmitter neuropeptides. Few investigations have so far addressed the spatial relationship between neurochemically different subpopulations of DRG neurons and glia. We used a whole-mount mouse lumbar DRG preparation, confocal microscopy and computer-aided 3D analysis to unveil that IB4+ non-peptidergic neurons form small clusters of 4.7 ± 0.26 cells, differently from CGRP+ peptidergic neurons that are, for the most, isolated (1.89 ± 0.11 cells). Both subpopulations of neurons are ensheathed by a thin layer of satellite glial cells (SGCs) that can be observed after immunolabeling with the specific marker glutamine synthetase (GS). Notably, at the ultrastructural level we observed that this glial layer was discontinuous, as there were patches of direct contact between the membranes of two adjacent IB4+ neurons. To test whether this cytoarchitectonic organization was modified in the diabetic neuropathy, one of the most devastating sensory pathologies, mice were made diabetic by streptozotocin (STZ). In diabetic animals, cluster organization of the IB4+ non-peptidergic neurons was maintained, but the neuro-glial relationship was altered, as STZ treatment caused a statistically significant increase of GS staining around CGRP+ neurons but a reduction around IB4+ neurons. Ultrastructural analysis unveiled that SGC coverage was increased at the interface between IB4+ cluster-forming neurons in diabetic mice, with a 50% reduction in the points of direct contacts between cells. These observations demonstrate the existence of a structural plasticity of the DRG cytoarchitecture in response to STZ.
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Affiliation(s)
- Elisa Ciglieri
- Department of Veterinary Sciences, University of Turin, Grugliasco, Italy.,Max Planck Institute for Metabolism Research, Cologne, Germany
| | - Maurizia Vacca
- Department of Control and Computer Engineering, Politecnico di Torino, Torino, Italy
| | - Francesco Ferrini
- Department of Veterinary Sciences, University of Turin, Grugliasco, Italy.,Department of Psychiatry & Neuroscience, Université Laval, Québec, QC, Canada
| | - Mona A Atteya
- Department of Biochemistry, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Patrizia Aimar
- Department of Veterinary Sciences, University of Turin, Grugliasco, Italy
| | - Elisa Ficarra
- Department of Control and Computer Engineering, Politecnico di Torino, Torino, Italy
| | - Santa Di Cataldo
- Department of Control and Computer Engineering, Politecnico di Torino, Torino, Italy
| | - Adalberto Merighi
- Department of Veterinary Sciences, University of Turin, Grugliasco, Italy.,National Institute of Neuroscience, Grugliasco, Italy
| | - Chiara Salio
- Department of Veterinary Sciences, University of Turin, Grugliasco, Italy
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6
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Chen D, Gu T, Pham TN, Zachary MJ, Hewes RS. Regulatory Mechanisms of Metamorphic Neuronal Remodeling Revealed Through a Genome-Wide Modifier Screen in Drosophila melanogaster. Genetics 2017; 206:1429-43. [PMID: 28476867 DOI: 10.1534/genetics.117.200378] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Accepted: 04/28/2017] [Indexed: 02/01/2023] Open
Abstract
During development, neuronal remodeling shapes neuronal connections to establish fully mature and functional nervous systems. Our previous studies have shown that the RNA-binding factor alan shepard (shep) is an important regulator of neuronal remodeling during metamorphosis in Drosophila melanogaster, and loss of shep leads to smaller soma size and fewer neurites in a stage-dependent manner. To shed light on the mechanisms by which shep regulates neuronal remodeling, we conducted a genetic modifier screen for suppressors of shep-dependent wing expansion defects and cellular morphological defects in a set of peptidergic neurons, the bursicon neurons, that promote posteclosion wing expansion. Out of 702 screened deficiencies that covered 86% of euchromatic genes, we isolated 24 deficiencies as candidate suppressors, and 12 of them at least partially suppressed morphological defects in shep mutant bursicon neurons. With RNA interference and mutant alleles of individual genes, we identified Daughters against dpp (Dad) and Olig family (Oli) as shep suppressor genes, and both of them restored the adult cellular morphology of shep-depleted bursicon neurons. Dad encodes an inhibitory Smad protein that inhibits bone morphogenetic protein (BMP) signaling, raising the possibility that shep interacted with BMP signaling through antagonism of Dad. By manipulating expression of the BMP receptor tkv, we found that activated BMP signaling was sufficient to rescue loss-of-shep phenotypes. These findings reveal mechanisms of shep regulation during neuronal development, and they highlight a novel genetic shep interaction with the BMP signaling pathway that controls morphogenesis in mature, terminally differentiated neurons during metamorphosis.
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7
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Lim MA, Chitturi J, Laskova V, Meng J, Findeis D, Wiekenberg A, Mulcahy B, Luo L, Li Y, Lu Y, Hung W, Qu Y, Ho CY, Holmyard D, Ji N, McWhirter R, Samuel AD, Miller DM, Schnabel R, Calarco JA, Zhen M. Neuroendocrine modulation sustains the C. elegans forward motor state. eLife 2016; 5:19887. [PMID: 27855782 PMCID: PMC5120884 DOI: 10.7554/elife.19887] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [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: 08/25/2016] [Accepted: 11/14/2016] [Indexed: 12/12/2022] Open
Abstract
Neuromodulators shape neural circuit dynamics. Combining electron microscopy, genetics, transcriptome profiling, calcium imaging, and optogenetics, we discovered a peptidergic neuron that modulates C. elegans motor circuit dynamics. The Six/SO-family homeobox transcription factor UNC-39 governs lineage-specific neurogenesis to give rise to a neuron RID. RID bears the anatomic hallmarks of a specialized endocrine neuron: it harbors near-exclusive dense core vesicles that cluster periodically along the axon, and expresses multiple neuropeptides, including the FMRF-amide-related FLP-14. RID activity increases during forward movement. Ablating RID reduces the sustainability of forward movement, a phenotype partially recapitulated by removing FLP-14. Optogenetic depolarization of RID prolongs forward movement, an effect reduced in the absence of FLP-14. Together, these results establish the role of a neuroendocrine cell RID in sustaining a specific behavioral state in C. elegans. DOI:http://dx.doi.org/10.7554/eLife.19887.001
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Affiliation(s)
- Maria A Lim
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Jyothsna Chitturi
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada.,Institute of Medical Science, University of Toronto, Toronto, Canada
| | - Valeriya Laskova
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada.,Department of Physiology, University of Toronto, Toronto, Canada
| | - Jun Meng
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada.,Department of Physiology, University of Toronto, Toronto, Canada
| | - Daniel Findeis
- Institut für Genetik, Technische Universität Braunschweig Carolo Wilhelmina, Braunschweig, Germany
| | - Anne Wiekenberg
- Institut für Genetik, Technische Universität Braunschweig Carolo Wilhelmina, Braunschweig, Germany
| | - Ben Mulcahy
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Linjiao Luo
- Key Laboratory of Modern Acoustics, Ministry of Education, Department of Physics, Nanjing University, Nanjing, China
| | - Yan Li
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada.,Department of Physiology, University of Toronto, Toronto, Canada
| | - Yangning Lu
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada.,Department of Physiology, University of Toronto, Toronto, Canada
| | - Wesley Hung
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Yixin Qu
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Chi-Yip Ho
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Douglas Holmyard
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada
| | - Ni Ji
- Center for Brain Science, Harvard University, Cambridge, United States.,Department of Physics, Harvard University, Cambridge, United States
| | - Rebecca McWhirter
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, United States
| | - Aravinthan Dt Samuel
- Center for Brain Science, Harvard University, Cambridge, United States.,Department of Physics, Harvard University, Cambridge, United States
| | - David M Miller
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, United States
| | - Ralf Schnabel
- Institut für Genetik, Technische Universität Braunschweig Carolo Wilhelmina, Braunschweig, Germany
| | - John A Calarco
- FAS Center for Systems Biology, Harvard University, Cambridge, United States
| | - Mei Zhen
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Canada.,Institute of Medical Science, University of Toronto, Toronto, Canada.,Department of Physiology, University of Toronto, Toronto, Canada
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8
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Garduño J, Elenes S, Cebada J, Becerra E, García U. Expression and functional characterization of GABA transporters in crayfish neurosecretory cells. J Neurosci 2002; 22:9176-84. [PMID: 12417642 PMCID: PMC6758017] [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] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2002] [Revised: 08/15/2002] [Accepted: 08/15/2002] [Indexed: 02/27/2023] Open
Abstract
The effect of GABA on membrane potential and ionic currents of X-organ neurons isolated from the crayfish eyestalk was investigated. Under voltage-clamp conditions, GABA elicited an inward Na+ current followed by a sustained outward chloride current. Sodium current was partially blocked in a dose-dependent manner by antagonists of GABA plasma membrane transporters such as beta-alanine, nipecotic acid, 1-[2([(diphenylmethylene)imino]oxy)ethyl]-1,2,5,6-tetrahydro-3-pyridinecarboxylic acid hydrochloride (NO 711), and SKF89976-A at concentrations between 1 and 100 microm. This current was totally blocked by the combined application of NO 711 (5 microm) and beta-alanine (50 microm). We obtained an EC(50) of 5 microm and a Hill coefficient of 0.97 for the GABA transport mediated response. These results together with studies of immunolocalization using antibodies against neuronal vertebrate GABA transporters (GATs) indicate the presence of GAT-1- and GAT-3-like proteins in X-organ neurons. To isolate the sustained outward Cl- current, extracellular free sodium solution was used to minimize the contribution of GAT activity. We concluded that this current was caused by the activation of GABA(A)-like receptors with an EC50 of 10 microm and a Hill number of 1.7. To assign a functional role to the GATs in the X-organ sinus gland system, we determine the GABA concentration (0.46-0.15 microm) in hemolymph samples using HPLC. In summary, our results suggest that a sodium-dependent electrogenic GABA uptake mechanism has a direct influence on the excitability of the X-organ neurons, maintaining an excitatory tone that is dependent on the circulating GABA level.
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Affiliation(s)
- Julieta Garduño
- Department of Physiology, Biophysics, and Neuroscience, Centro de Investigación y de Estudios Avanzados, 07360 Mexico City, Mexico
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9
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Abstract
Autonomic nerves and endocrine cells of both the gastrointestinal tract and the pancreatic islets participate in the control of several processes related to the digestion and metabolism of nutrients. While it was once thought that they acted separately to regulate these processes, it is now appreciated that numerous interactions exist between the functions of autonomic nerves and GEP endocrine cells. Recent studies show that autonomic signals play a role in the secretory activity of various GEP cells, thus providing a mechanism by which the central nervous system can integrate digestive and metabolic functions. It also has been shown that nerves and endocrine cells frequently share certain common peptides and/or amines. Therefore, in functional terms, it is often difficult to determine whether a specific peptide or amine should be considered a neurotransmitter or a hormone. Within the next few years, one can reasonably expect that new techniques and methods of investigation will clarify the roles of putative chemical messengers such as the peptides found within autonomic nerves and the amines found within endocrine cells. It also seems likely that future studies will demonstrate that the specific chemical messenger and the mechanism by which it reaches its target cells are far more important factors in the understanding of gastrointestinal and endocrine pancreatic function, than whether or not these signals are neural or endocrine in origin.
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Affiliation(s)
- P H Smith
- Department of Anatomy, Upstate Medical Center, State University of New York, Syracuse, New York, USA
| | - Katherine L Madson
- Department of Anatomy, Upstate Medical Center, State University of New York, Syracuse, New York, USA
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