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Malapert P, Robert G, Brunet E, Chemin J, Bourinet E, Moqrich A. A novel Na v1.8-FLPo driver mouse for intersectional genetics to uncover the functional significance of primary sensory neuron diversity. iScience 2024; 27:109396. [PMID: 38510134 PMCID: PMC10952036 DOI: 10.1016/j.isci.2024.109396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 11/08/2023] [Accepted: 02/28/2024] [Indexed: 03/22/2024] Open
Abstract
The recent development of single-cell and single-nucleus RNA sequencing has highlighted the extraordinary diversity of dorsal root ganglia neurons. However, the few available genetic tools limit our understanding of the functional significance of this heterogeneity. We generated a new mouse line expressing the flippase recombinase from the scn10a locus. By crossing Nav1.8Ires-FLPo mice with the AdvillinCre and RC::FL-hM3Dq mouse lines in an intersectional genetics approach, we were able to obtain somatodendritic expression of hM3Dq-mCherry selectively in the Nav1.8 lineage. The bath application of clozapine N-oxide triggered strong calcium responses selectively in mCherry+ neurons. The intraplantar injection of CNO caused robust flinching, shaking, and biting responses accompanied by strong cFos activation in the ipsilateral lumbar spinal cord. The Nav1.8Ires-FLPo mouse model will be a valuable tool for extending our understanding of the in vivo functional specialization of neuronal subsets of the Nav1.8 lineage for which inducible Cre lines are available.
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Affiliation(s)
- Pascale Malapert
- Aix-Marseille Université, CNRS, Institut de Biologie du Développement de Marseille, UMR 7288, case 907, 13288 Marseille Cedex 09, Marseille, France
| | - Guillaume Robert
- Aix-Marseille Université, CNRS, Institut de Biologie du Développement de Marseille, UMR 7288, case 907, 13288 Marseille Cedex 09, Marseille, France
| | - Elena Brunet
- Aix-Marseille Université, CNRS, Institut de Biologie du Développement de Marseille, UMR 7288, case 907, 13288 Marseille Cedex 09, Marseille, France
| | - Jean Chemin
- Institut de Génomique Fonctionnelle (IGF), Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Emmanuel Bourinet
- Institut de Génomique Fonctionnelle (IGF), Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Aziz Moqrich
- Aix-Marseille Université, CNRS, Institut de Biologie du Développement de Marseille, UMR 7288, case 907, 13288 Marseille Cedex 09, Marseille, France
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2
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Hackney CM, Flórez Salcedo P, Mueller E, Koch TL, Kjelgaard LD, Watkins M, Zachariassen LG, Tuelung PS, McArthur JR, Adams DJ, Kristensen AS, Olivera B, Finol-Urdaneta RK, Safavi-Hemami H, Morth JP, Ellgaard L. A previously unrecognized superfamily of macro-conotoxins includes an inhibitor of the sensory neuron calcium channel Cav2.3. PLoS Biol 2023; 21:e3002217. [PMID: 37535677 PMCID: PMC10437998 DOI: 10.1371/journal.pbio.3002217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 08/18/2023] [Accepted: 06/27/2023] [Indexed: 08/05/2023] Open
Abstract
Animal venom peptides represent valuable compounds for biomedical exploration. The venoms of marine cone snails constitute a particularly rich source of peptide toxins, known as conotoxins. Here, we identify the sequence of an unusually large conotoxin, Mu8.1, which defines a new class of conotoxins evolutionarily related to the well-known con-ikot-ikots and 2 additional conotoxin classes not previously described. The crystal structure of recombinant Mu8.1 displays a saposin-like fold and shows structural similarity with con-ikot-ikot. Functional studies demonstrate that Mu8.1 curtails calcium influx in defined classes of murine somatosensory dorsal root ganglion (DRG) neurons. When tested on a variety of recombinantly expressed voltage-gated ion channels, Mu8.1 displayed the highest potency against the R-type (Cav2.3) calcium channel. Ca2+ signals from Mu8.1-sensitive DRG neurons were also inhibited by SNX-482, a known spider peptide modulator of Cav2.3 and voltage-gated K+ (Kv4) channels. Our findings highlight the potential of Mu8.1 as a molecular tool to identify and study neuronal subclasses expressing Cav2.3. Importantly, this multidisciplinary study showcases the potential of uncovering novel structures and bioactivities within the largely unexplored group of macro-conotoxins.
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Affiliation(s)
- Celeste M. Hackney
- Department of Biology, Linderstrøm-Lang Centre for Protein Science, University of Copenhagen, Copenhagen, Denmark
| | - Paula Flórez Salcedo
- Department of Neurobiology and Anatomy, University of Utah, Salt Lake City, Utah, United States of America
| | - Emilie Mueller
- Enzyme and Protein Chemistry, Section for Protein Chemistry and Enzyme Technology, Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Thomas Lund Koch
- Department of Biochemistry, University of Utah, Salt Lake City, Utah, United States of America
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Lau D. Kjelgaard
- Department of Biology, Linderstrøm-Lang Centre for Protein Science, University of Copenhagen, Copenhagen, Denmark
| | - Maren Watkins
- School of Biological Sciences, University of Utah, Salt Lake City, Utah, United States of America
| | - Linda G. Zachariassen
- Department of Drug Design & Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | | | - Jeffrey R. McArthur
- Illawarra Health and Medical Research Institute (IHMRI), Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, Australia
| | - David J. Adams
- Illawarra Health and Medical Research Institute (IHMRI), Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, Australia
| | - Anders S. Kristensen
- Department of Drug Design & Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Baldomero Olivera
- School of Biological Sciences, University of Utah, Salt Lake City, Utah, United States of America
| | - Rocio K. Finol-Urdaneta
- Illawarra Health and Medical Research Institute (IHMRI), Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, Australia
- Electrophysiology Facility for Cell Phenotyping and Drug Discovery, Wollongong, Australia
| | - Helena Safavi-Hemami
- Department of Biochemistry, University of Utah, Salt Lake City, Utah, United States of America
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
- School of Biological Sciences, University of Utah, Salt Lake City, Utah, United States of America
| | - Jens Preben Morth
- Enzyme and Protein Chemistry, Section for Protein Chemistry and Enzyme Technology, Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Lars Ellgaard
- Department of Biology, Linderstrøm-Lang Centre for Protein Science, University of Copenhagen, Copenhagen, Denmark
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3
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Wyart C, Ki Jim K, Prendergast A. Sensory systems in the peripheral and central nervous systems shape host response during infections. Neuroscience 2023:S0306-4522(23)00303-2. [PMID: 37419406 DOI: 10.1016/j.neuroscience.2023.07.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/09/2023]
Abstract
The function of sensory cells has been largely investigated in the field of neuroscience for how they report the physical and chemical changes of the environment ("exteroception") and of internal physiology ("interoception"). Investigations over the last century have largely focused on the morphological, electrical and receptor properties of sensory cells in the nervous system focusing on conscious perception of external cues or homeostatic regulation upon detection of internal cues. Research in the last decade has uncovered that sensory cells can often sense polymodal cues, such as mechanical, chemical, and/ or thermal. Furthermore, sensory cells in the peripheral as well as in the central nervous system can detect evidence associated with the invasion of pathogenic bacteria or viruses. The corresponding neuronal activation associated with the presence of pathogens can impact their classical functions within the nervous system and trigger the release of compounds modulating the response to intruders, either triggering pain to raise awareness, enhancing host defense or sometimes, aggravating the infection. This perspective brings to light the need for interdisciplinary training in immunology, microbiology and neuroscience for the next generation of investigators in this field.
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Affiliation(s)
- Claire Wyart
- Sorbonne Université, INSERM U1127, UMR CNRS 7225, Institut du Cerveau (ICM), 47 bld de l'hôpital, Paris 75013, France.
| | - Kin Ki Jim
- Department of Fundamental Microbiology, Faculty of Biology and Medicine, University of Lausanne, Biophore Building, 1015, Lausanne, Switzerland
| | - Andrew Prendergast
- Comparative Medicine, 300 George St., Room 0752, New Haven, CT 06511, United States
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4
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Xie K, Cheng X, Zhu T, Zhang D. Single-cell transcriptomic profiling of dorsal root ganglion: an overview. Front Neuroanat 2023; 17:1162049. [PMID: 37405309 PMCID: PMC10315536 DOI: 10.3389/fnana.2023.1162049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 06/06/2023] [Indexed: 07/06/2023] Open
Abstract
The somatosensory neurons in the dorsal root ganglion (DRG) are responsible to detect peripheral physical and noxious stimuli, and then transmit these inputs into the central nervous system. DRG neurons are composed of various subpopulations, which are suggested to respond to different stimuli, such as mechanical, thermal, and cold perception. For a long time, DRG neurons were classified based on anatomical criteria. Recently, single-cell (scRNA-seq) and single-nucleus RNA-sequencing (snRNA-seq) has advanced our understanding of the composition and functional heterogeneity of both human and rodent DRG neurons at single-cell resolution. In this review, we summarized the current literature regarding single-cell transcriptomic profiling of DRG to provide an integral understanding in the molecular transcriptomes, cell types, and functional annotations of DRG neurons in humans and rodents.
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Affiliation(s)
- Keyu Xie
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
- Department of Anesthesiology, Chengdu Second People’s Hospital, Chengdu, China
| | - Xu Cheng
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Tao Zhu
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Donghang Zhang
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
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5
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Sun L, Zhang J, Niu C, Deering-Rice CE, Hughen RW, Lamb JG, Rose K, Chase KM, Almestica-Roberts M, Walter M, Schmidt EW, Light AR, Olivera BM, Reilly CA. CYP1B1-derived epoxides modulate the TRPA1 channel in chronic pain. Acta Pharm Sin B 2023; 13:68-81. [PMID: 36815047 PMCID: PMC9939319 DOI: 10.1016/j.apsb.2022.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 07/19/2022] [Accepted: 08/18/2022] [Indexed: 11/28/2022] Open
Abstract
Pain is often debilitating, and current treatments are neither universally efficacious nor without risks. Transient receptor potential (TRP) ion channels offer alternative targets for pain relief, but little is known about the regulation or identities of endogenous TRP ligands that affect inflammation and pain. Here, transcriptomic and targeted lipidomic analysis of damaged tissue from the mouse spinal nerve ligation (SNL)-induced chronic pain model revealed a time-dependent increase in Cyp1b1 mRNA and a concurrent accumulation of 8,9-epoxyeicosatrienoic acid (EET) and 19,20-EpDPA post injury. Production of 8,9-EET and 19,20-EpDPA by human/mouse CYP1B1 was confirmed in vitro, and 8,9-EET and 19,20-EpDPA selectively and dose-dependently sensitized and activated TRPA1 in overexpressing HEK-293 cells and Trpa1-expressing/AITC-responsive cultured mouse peptidergic dorsal root ganglia (DRG) neurons. TRPA1 activation by 8,9-EET and 19,20-EpDPA was attenuated by the antagonist A967079, and mouse TRPA1 was more responsive to 8,9-EET and 19,20-EpDPA than human TRPA1. This latter effect mapped to residues Y933, G939, and S921 of TRPA1. Intra-plantar injection of 19,20-EpDPA induced acute mechanical, but not thermal hypersensitivity in mice, which was also blocked by A967079. Similarly, Cyp1b1-knockout mice displayed a reduced chronic pain phenotype following SNL injury. These data suggest that manipulation of the CYP1B1-oxylipin-TRPA1 axis might have therapeutic benefit.
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Affiliation(s)
- Lili Sun
- Department of Pharmacology and Toxicology, Center for Human Toxicology, University of Utah, Salt Lake City, UT 84112, USA
| | - Jie Zhang
- Department of Anesthesiology, School of Medicine, University of Utah, Salt Lake City, UT 84112, USA
| | - Changshan Niu
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, UT 84112, USA
| | - Cassandra E. Deering-Rice
- Department of Pharmacology and Toxicology, Center for Human Toxicology, University of Utah, Salt Lake City, UT 84112, USA
| | - Ronald W. Hughen
- Department of Anesthesiology, School of Medicine, University of Utah, Salt Lake City, UT 84112, USA
| | - John G. Lamb
- Department of Pharmacology and Toxicology, Center for Human Toxicology, University of Utah, Salt Lake City, UT 84112, USA
| | - Katherine Rose
- Department of Pharmacology and Toxicology, Center for Human Toxicology, University of Utah, Salt Lake City, UT 84112, USA
| | - Kevin M. Chase
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA
| | - Marysol Almestica-Roberts
- Department of Pharmacology and Toxicology, Center for Human Toxicology, University of Utah, Salt Lake City, UT 84112, USA
| | - Markel Walter
- Department of Anesthesiology, School of Medicine, University of Utah, Salt Lake City, UT 84112, USA
| | - Eric W. Schmidt
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, UT 84112, USA
| | - Alan R. Light
- Department of Anesthesiology, School of Medicine, University of Utah, Salt Lake City, UT 84112, USA
| | - Baldomero M. Olivera
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA
| | - Christopher A. Reilly
- Department of Pharmacology and Toxicology, Center for Human Toxicology, University of Utah, Salt Lake City, UT 84112, USA,Corresponding author. Tel.: +1 8015815236.
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6
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Graham RD, Sankarasubramanian V, Lempka SF. Dorsal Root Ganglion Stimulation for Chronic Pain: Hypothesized Mechanisms of Action. THE JOURNAL OF PAIN 2022; 23:196-211. [PMID: 34425252 PMCID: PMC8943693 DOI: 10.1016/j.jpain.2021.07.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 06/28/2021] [Accepted: 07/20/2021] [Indexed: 02/03/2023]
Abstract
Dorsal root ganglion stimulation (DRGS) is a neuromodulation therapy for chronic pain that is refractory to conventional medical management. Currently, the mechanisms of action of DRGS-induced pain relief are unknown, precluding both our understanding of why DRGS fails to provide pain relief to some patients and the design of neurostimulation technologies that directly target these mechanisms to maximize pain relief in all patients. Due to the heterogeneity of sensory neurons in the dorsal root ganglion (DRG), the analgesic mechanisms could be attributed to the modulation of one or many cell types within the DRG and the numerous brain regions that process sensory information. Here, we summarize the leading hypotheses of the mechanisms of DRGS-induced analgesia, and propose areas of future study that will be vital to improving the clinical implementation of DRGS. PERSPECTIVE: This article synthesizes the evidence supporting the current hypotheses of the mechanisms of action of DRGS for chronic pain and suggests avenues for future interdisciplinary research which will be critical to fully elucidate the analgesic mechanisms of the therapy.
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Affiliation(s)
- Robert D. Graham
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, United States,Biointerfaces Institute, University of Michigan, Ann Arbor, MI 48109, United States
| | - Vishwanath Sankarasubramanian
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, United States,Biointerfaces Institute, University of Michigan, Ann Arbor, MI 48109, United States
| | - Scott F. Lempka
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, United States,Biointerfaces Institute, University of Michigan, Ann Arbor, MI 48109, United States,Department of Anesthesiology, University of Michigan, Ann Arbor, MI 48109, United States,Corresponding author: Scott F. Lempka, PhD, Department of Biomedical Engineering, University of Michigan, 2800 Plymouth Road, NCRC 14-184, Ann Arbor, MI 48109-2800,
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7
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Multitarget nociceptor sensitization by a promiscuous peptide from the venom of the King Baboon spider. Proc Natl Acad Sci U S A 2022; 119:2110932119. [PMID: 35074873 PMCID: PMC8812547 DOI: 10.1073/pnas.2110932119] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/23/2021] [Indexed: 12/15/2022] Open
Abstract
The King Baboon spider, Pelinobius muticus, is a burrowing African tarantula. Its impressive size and appealing coloration are tempered by reports describing severe localized pain, swelling, itchiness, and muscle cramping after accidental envenomation. Hyperalgesia is the most prominent symptom after bites from P. muticus, but the molecular basis by which the venom induces pain is unknown. Proteotranscriptomic analysis of P. muticus venom uncovered a cysteine-rich peptide, δ/κ-theraphotoxin-Pm1a (δ/κ-TRTX-Pm1a), that elicited nocifensive behavior when injected into mice. In small dorsal root ganglion neurons, synthetic δ/κ-TRTX-Pm1a (sPm1a) induced hyperexcitability by enhancing tetrodotoxin-resistant sodium currents, impairing repolarization and lowering the threshold of action potential firing, consistent with the severe pain associated with envenomation. The molecular mechanism of nociceptor sensitization by sPm1a involves multimodal actions over several ion channel targets, including NaV1.8, KV2.1, and tetrodotoxin-sensitive NaV channels. The promiscuous targeting of peptides like δ/κ-TRTX-Pm1a may be an evolutionary adaptation in pain-inducing defensive venoms.
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8
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Li S, Zhao F, Tang Q, Xi C, He J, Wang Y, Zhu MX, Cao Z. Sarco/endoplasmic reticulum Ca 2+ -ATPase 2b mediates oxidation-induced endoplasmic reticulum stress to regulate neuropathic pain. Br J Pharmacol 2021; 179:2016-2036. [PMID: 34811737 DOI: 10.1111/bph.15744] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/24/2021] [Accepted: 11/05/2021] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE Neuropathic pain is a widespread health problem with limited curative treatment. Decreased sarco/endoplasmic reticulum Ca2+ -ATPase (SERCA) expression has been reported in dorsal root ganglion (DRG) of animals suffering from neuropathic pain. We aimed to establish the relationship between SERCA expression and the pain responses and to elucidate the underlying molecular mechanism. EXPERIMENTAL APPROACH Neuropathic pain was modeled using rat chronic constriction injury (CCI). Ca2+ imaging and current clamp patch-clamp were used to determine cytosolic Ca2+ levels and action potential firing, respectively. Western blots, immunofluorescence staining and RT-PCR were used to quantitatively assess protein and mRNA expression, respectively. H&E staining and coupled enzyme assay were used to evaluate the nerve injury and SERCA2b activity, respectively. KEY RESULTS SERCA2b is the predominant SERCA isoform in rat DRG and its expression is decreased after CCI at mRNA, protein and activity levels. Whereas inhibiting SERCA with thapsigargin causes neuronal hyperexcitation, nerve injury, ER stress, satellite glial cell activation and mechanical allodynia, activating SERCA by CDN1163 or overexpressing SERCA2b in DRG after CCI produces long-term relief of mechanical and thermal allodynia with accompanied morphological and functional restoration through alleviation of ER stress. Furthermore, the downregulation of DRG SERCA2b in CCI rats is caused by increased production of reactive oxygen species (ROS) through Sp1-dependent transcriptional inhibition. CONCLUSION AND IMPLICATIONS Our findings reveal a novel pathway centering around SERCA2b as the key molecule underlying the mechanism of development and maintenance of neuropathic pain, and SERCA2b activators have the potential for therapeutic treatment of neuropathic pain.
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Affiliation(s)
- Shaoheng Li
- State Key Laboratory of Natural Medicines and Jiangsu Provincial Key Laboratory for TCM Evaluation and Translational Development, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu, China
| | - Fang Zhao
- State Key Laboratory of Natural Medicines and Jiangsu Provincial Key Laboratory for TCM Evaluation and Translational Development, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu, China
| | - Qinglian Tang
- State Key Laboratory of Natural Medicines and Jiangsu Provincial Key Laboratory for TCM Evaluation and Translational Development, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu, China
| | - Chuchu Xi
- State Key Laboratory of Natural Medicines and Jiangsu Provincial Key Laboratory for TCM Evaluation and Translational Development, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu, China
| | - Jing He
- State Key Laboratory of Natural Medicines and Jiangsu Provincial Key Laboratory for TCM Evaluation and Translational Development, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu, China
| | - Yujing Wang
- State Key Laboratory of Natural Medicines and Jiangsu Provincial Key Laboratory for TCM Evaluation and Translational Development, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu, China
| | - Michael X Zhu
- Department of Integrative Biology and Pharmacology, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Zhengyu Cao
- State Key Laboratory of Natural Medicines and Jiangsu Provincial Key Laboratory for TCM Evaluation and Translational Development, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu, China
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9
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Wang Y, Garg R, Hartung JE, Goad A, Patel DA, Vitale F, Gold MS, Gogotsi Y, Cohen-Karni T. Ti 3C 2T x MXene Flakes for Optical Control of Neuronal Electrical Activity. ACS NANO 2021; 15:14662-14671. [PMID: 34431659 PMCID: PMC9285622 DOI: 10.1021/acsnano.1c04431] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Understanding cellular electrical communications in both health and disease necessitates precise subcellular electrophysiological modulation. Nanomaterial-assisted photothermal stimulation was demonstrated to modulate cellular activity with high spatiotemporal resolution. Ideal candidates for such an application are expected to have high absorbance at the near-infrared window, high photothermal conversion efficiency, and straightforward scale-up of production to allow future translation. Here, we demonstrate two-dimensional Ti3C2Tx (MXene) as an outstanding candidate for remote, nongenetic, optical modulation of neuronal electrical activity with high spatiotemporal resolution. Ti3C2Tx's photothermal response measured at the single-flake level resulted in local temperature rises of 2.31 ± 0.03 and 3.30 ± 0.02 K for 635 and 808 nm laser pulses (1 ms, 10 mW), respectively. Dorsal root ganglion (DRG) neurons incubated with Ti3C2Tx film (25 μg/cm2) or Ti3C2Tx flake dispersion (100 μg/mL) for 6 days did not show a detectable influence on cellular viability, indicating that Ti3C2Tx is noncytotoxic. DRG neurons were photothermally stimulated using Ti3C2Tx films and flakes with as low as tens of microjoules per pulse incident energy (635 nm, 2 μJ for film, 18 μJ for flake) with subcellular targeting resolution. Ti3C2Tx's straightforward and large-scale synthesis allows translation of the reported photothermal stimulation approach in multiple scales, thus presenting a powerful tool for modulating electrophysiology from single-cell to additive manufacturing of engineered tissues.
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Affiliation(s)
- Yingqiao Wang
- Department
of Materials Science and Engineering, Carnegie
Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Raghav Garg
- Department
of Materials Science and Engineering, Carnegie
Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Jane E. Hartung
- Department
of Neurobiology, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, United States
| | - Adam Goad
- A.J.
Drexel Nanomaterials Institute and Department of Materials Science
and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Dipna A. Patel
- A.J.
Drexel Nanomaterials Institute and Department of Materials Science
and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Flavia Vitale
- Department
of Neurology, Department of Bioengineering, Department of Physical
Medicine & Rehabilitation, and Center for Neuroengineering and
Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Center
for
Neurotrauma, Neurodegeneration, and Restoration, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania 19104, United States
| | - Michael S. Gold
- Department
of Neurobiology, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, United States
| | - Yury Gogotsi
- A.J.
Drexel Nanomaterials Institute and Department of Materials Science
and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Tzahi Cohen-Karni
- Department
of Materials Science and Engineering, Carnegie
Mellon University, Pittsburgh, Pennsylvania 15213, United States
- Department
of Biomedical Engineering, Carnegie Mellon
University, Pittsburgh, Pennsylvania 15213, United States
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10
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Paguigan ND, Yan Y, Karthikeyan M, Chase K, Carter J, Leavitt LS, Lim AL, Lin Z, Memon T, Christensen S, Bentzen BH, Schmitt N, Reilly CA, Teichert RW, Raghuraman S, Olivera BM, Schmidt EW. The Tunicate Metabolite 2-(3,5-Diiodo-4-methoxyphenyl)ethan-1-amine Targets Ion Channels of Vertebrate Sensory Neurons. ACS Chem Biol 2021; 16:1654-1662. [PMID: 34423964 DOI: 10.1021/acschembio.1c00328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Marine tunicates produce defensive amino-acid-derived metabolites, including 2-(3,5-diiodo-4-methoxyphenyl)ethan-1-amine (DIMTA), but their mechanisms of action are rarely known. Using an assay-guided approach, we found that out of the many different sensory cells in the mouse dorsal root ganglion (DRG), DIMTA selectively affected low-threshold cold thermosensors. Whole-cell electrophysiology experiments using DRG cells, channels expressed in Xenopus oocytes, and human cell lines revealed that DIMTA blocks several potassium channels, reducing the magnitude of the afterhyperpolarization and increasing the baseline intracellular calcium concentration [Ca2+]i of low-threshold cold thermosensors. When injected into mice, DIMTA increased the threshold of cold sensation by >3 °C. DIMTA may thus serve as a lead in the further design of compounds that inhibit problems in the cold-sensory system, such as cold allodynia and other neuropathic pain conditions.
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Affiliation(s)
- Noemi D. Paguigan
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 81112, United States
| | - Yannan Yan
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Manju Karthikeyan
- Department of Biology, University of Utah, Salt Lake City, Utah 81112, United States
| | - Kevin Chase
- Department of Biology, University of Utah, Salt Lake City, Utah 81112, United States
| | - Jackson Carter
- Department of Biology, University of Utah, Salt Lake City, Utah 81112, United States
| | - Lee S. Leavitt
- Department of Biology, University of Utah, Salt Lake City, Utah 81112, United States
| | - Albebson L. Lim
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 81112, United States
| | - Zhenjian Lin
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 81112, United States
| | - Tosifa Memon
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 81112, United States
| | - Sean Christensen
- Department of Biology, University of Utah, Salt Lake City, Utah 81112, United States
| | - Bo H. Bentzen
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Nicole Schmitt
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Christopher A. Reilly
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 81112, United States
| | - Russell W. Teichert
- Department of Biology, University of Utah, Salt Lake City, Utah 81112, United States
| | | | - Baldomero M. Olivera
- Department of Biology, University of Utah, Salt Lake City, Utah 81112, United States
| | - Eric W. Schmidt
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 81112, United States
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11
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Abstract
My path to research in neuropharmacology has been a coalescing of my training as a molecular biologist and my intense interest in an esoteric group of animals, the fish-hunting cone snails. Attempting to bridge these two disparate worlds has led me to an idiosyncratic career as a pharmacologist.
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Affiliation(s)
- Baldomero M Olivera
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, USA;
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12
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Paguigan ND, Tun JO, Leavitt LS, Lin Z, Chase K, Dowell C, Deering-Rice CE, Lim AL, Karthikeyan M, Hughen RW, Zhang J, Peterson RT, Reilly CA, Light AR, Raghuraman S, McIntosh JM, Olivera BM, Schmidt EW. Nicotinic Acetylcholine Receptor Partial Antagonist Polyamides from Tunicates and Their Predatory Sea Slugs. ACS Chem Neurosci 2021; 12:2693-2704. [PMID: 34213884 DOI: 10.1021/acschemneuro.1c00345] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
In our efforts to discover new drugs to treat pain, we identified molleamines A-E (1-5) as major neuroactive components of the sea slug, Pleurobranchus forskalii, and their prey, Didemnum molle, tunicates. The chemical structures of molleamines were elucidated by spectroscopy and confirmed by the total synthesis of molleamines A (1) and C (3). Synthetic 3 completely blocked acetylcholine-induced calcium flux in peptidergic nociceptors (PNs) in the somatosensory nervous system. Compound 3 affected neither the α7 nAChR nor the muscarinic acetylcholine receptors in calcium flux assays. In addition to nociceptors, 3 partially blocked the acetylcholine-induced calcium flux in the sympathetic nervous system, including neurons from the superior cervical ganglion. Electrophysiology revealed a block of α3β4 (mouse) and α6/α3β4 (rat) nicotinic acetylcholine receptors (nAChRs), with IC50 values of 1.4 and 3.1 μM, respectively. Molleamine C (3) is a partial antagonist, reaching a maximum block of 76-82% of the acetylcholine signal and showing no partial agonist response. Molleamine C (3) may thus provide a lead compound for the development of neuroactive compounds with unique biological properties.
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Affiliation(s)
- Noemi D. Paguigan
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Jortan O. Tun
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Lee S. Leavitt
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Zhenjian Lin
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Kevin Chase
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Cheryl Dowell
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Cassandra E. Deering-Rice
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84112, United States
| | - Albebson L. Lim
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Manju Karthikeyan
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Ronald W. Hughen
- Department of Anesthesiology, School of Medicine, University of Utah, Salt Lake City, Utah 84112, United States
| | - Jie Zhang
- Department of Anesthesiology, School of Medicine, University of Utah, Salt Lake City, Utah 84112, United States
| | - Randall T. Peterson
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84112, United States
| | - Christopher A. Reilly
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84112, United States
| | - Alan R. Light
- Department of Anesthesiology, School of Medicine, University of Utah, Salt Lake City, Utah 84112, United States
| | - Shrinivasan Raghuraman
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - J. Michael McIntosh
- Department of Psychiatry, and School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
- George E Whalen Veterans Affairs Medical Center, Salt Lake City, Utah 84148, United States
| | - Baldomero M. Olivera
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Eric W. Schmidt
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
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13
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Niu C, Leavitt LS, Lin Z, Paguigan ND, Sun L, Zhang J, Torres JP, Raghuraman S, Chase K, Cadeddu R, Karthikeyan M, Bortolato M, Reilly CA, Hughen RW, Light AR, Olivera BM, Schmidt EW. Neuroactive Type-A γ-Aminobutyric Acid Receptor Allosteric Modulator Steroids from the Hypobranchial Gland of Marine Mollusk, Conus geographus. J Med Chem 2021; 64:7033-7043. [PMID: 33949869 DOI: 10.1021/acs.jmedchem.1c00562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In a program to identify pain treatments with low addiction potential, we isolated five steroids, conosteroids A-E (1-5), from the hypobranchial gland of the mollusk Conus geographus. Compounds 1-5 were active in a mouse dorsal root ganglion (DRG) assay that suggested that they might be analgesic. A synthetic analogue 6 was used for a detailed pharmacological study. Compound 6 significantly increased the pain threshold in mice in the hot-plate test at 2 and 50 mg/kg. Compound 6 at 500 nM antagonizes type-A γ-aminobutyric acid receptors (GABAARs). In a patch-clamp experiment, out of the six subunit combinations tested, 6 exhibited subtype selectivity, most strongly antagonizing α1β1γ2 and α4β3γ2 receptors (IC50 1.5 and 1.0 μM, respectively). Although the structures of 1-6 differ from those of known neuroactive steroids, they are cell-type-selective modulators of GABAARs, expanding the known chemical space of neuroactive steroids.
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Affiliation(s)
- Changshan Niu
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Lee S Leavitt
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Zhenjian Lin
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Noemi D Paguigan
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Lili Sun
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84112, United States
| | - Jie Zhang
- Department of Anesthesiology, School of Medicine, University of Utah, Salt Lake City, Utah 84112, United States
| | - Joshua P Torres
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Shrinivasan Raghuraman
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Kevin Chase
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Roberto Cadeddu
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84112, United States
| | - Manju Karthikeyan
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Marco Bortolato
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84112, United States
| | - Christopher A Reilly
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84112, United States
| | - Ronald W Hughen
- Department of Anesthesiology, School of Medicine, University of Utah, Salt Lake City, Utah 84112, United States
| | - Alan R Light
- Department of Anesthesiology, School of Medicine, University of Utah, Salt Lake City, Utah 84112, United States
| | - Baldomero M Olivera
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Eric W Schmidt
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
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14
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Bosse GD, Urcino C, Watkins M, Flórez Salcedo P, Kozel S, Chase K, Cabang A, Espino SS, Safavi-Hemami H, Raghuraman S, Olivera BM, Peterson RT, Gajewiak J. Discovery of a Potent Conorfamide from Conus episcopatus Using a Novel Zebrafish Larvae Assay. JOURNAL OF NATURAL PRODUCTS 2021; 84:1232-1243. [PMID: 33764053 DOI: 10.1021/acs.jnatprod.0c01297] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Natural products such as conotoxins have tremendous potential as tools for biomedical research and for the treatment of different human diseases. Conotoxins are peptides present in the venoms of predatory cone snails that have a rich diversity of pharmacological functions. One of the major bottlenecks in natural products research is the rapid identification and evaluation of bioactive molecules. To overcome this limitation, we designed a set of light-induced behavioral assays in zebrafish larvae to screen for bioactive conotoxins. We used this screening approach to test several unique conotoxins derived from different cone snail clades and discovered that a conorfamide from Conus episcopatus, CNF-Ep1, had the most dramatic alterations in the locomotor behavior of zebrafish larvae. Interestingly, CNF-Ep1 is also bioactive in several mouse assay systems when tested in vitro and in vivo. Our novel screening platform can thus accelerate the identification of bioactive marine natural products, and the first compound discovered using this assay has intriguing properties that may uncover novel neuronal circuitry.
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Affiliation(s)
- Gabriel D Bosse
- Department of Pharmacology and Toxicology, University of Utah, 201 Skaggs Hall 30 S 2000 E, Salt Lake City, Utah 84112, United States
| | - Cristoval Urcino
- School of Biological Sciences, University of Utah, 257 S 1400 E, Salt Lake City, Utah 84112, United States
| | - Maren Watkins
- School of Biological Sciences, University of Utah, 257 S 1400 E, Salt Lake City, Utah 84112, United States
| | - Paula Flórez Salcedo
- Department of Neurobiology and Anatomy, University of Utah, 20 S 2030 E, BPRB 490D, Salt Lake City, Utah 84112, United States
| | - Sabrina Kozel
- School of Biological Sciences, University of Utah, 257 S 1400 E, Salt Lake City, Utah 84112, United States
| | - Kevin Chase
- School of Biological Sciences, University of Utah, 257 S 1400 E, Salt Lake City, Utah 84112, United States
| | - April Cabang
- School of Biological Sciences, University of Utah, 257 S 1400 E, Salt Lake City, Utah 84112, United States
| | - Samuel S Espino
- School of Biological Sciences, University of Utah, 257 S 1400 E, Salt Lake City, Utah 84112, United States
| | - Helena Safavi-Hemami
- School of Biological Sciences, University of Utah, 257 S 1400 E, Salt Lake City, Utah 84112, United States
- Department of Biochemistry, University of Utah, 15 N Medical Drive, Salt Lake City, Utah 84112, United States
- Department of Biomedical Sciences, University of Copenhagen, Ole Maaløes Vej 5, Copenhagen N DK-2200, Denmark
| | - Shrinivasan Raghuraman
- School of Biological Sciences, University of Utah, 257 S 1400 E, Salt Lake City, Utah 84112, United States
| | - Baldomero M Olivera
- School of Biological Sciences, University of Utah, 257 S 1400 E, Salt Lake City, Utah 84112, United States
| | - Randall T Peterson
- Department of Pharmacology and Toxicology, University of Utah, 201 Skaggs Hall 30 S 2000 E, Salt Lake City, Utah 84112, United States
| | - Joanna Gajewiak
- School of Biological Sciences, University of Utah, 257 S 1400 E, Salt Lake City, Utah 84112, United States
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15
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Torres JP, Lin Z, Watkins M, Salcedo PF, Baskin RP, Elhabian S, Safavi-Hemami H, Taylor D, Tun J, Concepcion GP, Saguil N, Yanagihara AA, Fang Y, McArthur JR, Tae HS, Finol-Urdaneta RK, Özpolat BD, Olivera BM, Schmidt EW. Small-molecule mimicry hunting strategy in the imperial cone snail, Conus imperialis. SCIENCE ADVANCES 2021; 7:7/11/eabf2704. [PMID: 33712468 PMCID: PMC7954447 DOI: 10.1126/sciadv.abf2704] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 01/26/2021] [Indexed: 05/08/2023]
Abstract
Venomous animals hunt using bioactive peptides, but relatively little is known about venom small molecules and the resulting complex hunting behaviors. Here, we explored the specialized metabolites from the venom of the worm-hunting cone snail, Conus imperialis Using the model polychaete worm Platynereis dumerilii, we demonstrate that C. imperialis venom contains small molecules that mimic natural polychaete mating pheromones, evoking the mating phenotype in worms. The specialized metabolites from different cone snails are species-specific and structurally diverse, suggesting that the cones may adopt many different prey-hunting strategies enabled by small molecules. Predators sometimes attract prey using the prey's own pheromones, in a strategy known as aggressive mimicry. Instead, C. imperialis uses metabolically stable mimics of those pheromones, indicating that, in biological mimicry, even the molecules themselves may be disguised, providing a twist on fake news in chemical ecology.
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Affiliation(s)
- Joshua P Torres
- Department of Medicinal Chemistry, College of Pharmacy, University of Utah, Salt Lake City, UT 84112, USA
| | - Zhenjian Lin
- Department of Medicinal Chemistry, College of Pharmacy, University of Utah, Salt Lake City, UT 84112, USA.
| | - Maren Watkins
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA
| | - Paula Flórez Salcedo
- Department of Neurobiology and Anatomy, University of Utah, Salt Lake City, UT 84112, USA
| | - Robert P Baskin
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA
| | - Shireen Elhabian
- Scientific Computing and Imaging Institute, School of Computing, University of Utah, Salt Lake City, UT 84112, USA
| | - Helena Safavi-Hemami
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen DK-2200, Denmark
- Department of Biochemistry, University of Utah, Salt Lake City, UT 84112, USA
| | - Dylan Taylor
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA
| | - Jortan Tun
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA
| | - Gisela P Concepcion
- Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines
| | - Noel Saguil
- Department of Medicinal Chemistry, College of Pharmacy, University of Utah, Salt Lake City, UT 84112, USA
| | - Angel A Yanagihara
- Department of Tropical Medicine, University of Hawaii, Honolulu, HI 96822, USA
| | - Yixin Fang
- Department of Medicinal Chemistry, College of Pharmacy, University of Utah, Salt Lake City, UT 84112, USA
| | - Jeffrey R McArthur
- Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Han-Shen Tae
- Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Rocio K Finol-Urdaneta
- Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW 2522, Australia
| | | | - Baldomero M Olivera
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA
| | - Eric W Schmidt
- Department of Medicinal Chemistry, College of Pharmacy, University of Utah, Salt Lake City, UT 84112, USA.
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA
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16
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Hulme AJ, McArthur JR, Maksour S, Miellet S, Ooi L, Adams DJ, Finol-Urdaneta RK, Dottori M. Molecular and Functional Characterization of Neurogenin-2 Induced Human Sensory Neurons. Front Cell Neurosci 2020; 14:600895. [PMID: 33362470 PMCID: PMC7761588 DOI: 10.3389/fncel.2020.600895] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 11/13/2020] [Indexed: 01/15/2023] Open
Abstract
Sensory perception is fundamental to everyday life, yet understanding of human sensory physiology at the molecular level is hindered due to constraints on tissue availability. Emerging strategies to study and characterize peripheral neuropathies in vitro involve the use of human pluripotent stem cells (hPSCs) differentiated into dorsal root ganglion (DRG) sensory neurons. However, neuronal functionality and maturity are limited and underexplored. A recent and promising approach for directing hPSC differentiation towards functionally mature neurons involves the exogenous expression of Neurogenin-2 (NGN2). The optimized protocol described here generates sensory neurons from hPSC-derived neural crest (NC) progenitors through virally induced NGN2 expression. NC cells were derived from hPSCs via a small molecule inhibitor approach and enriched for migrating NC cells (66% SOX10+ cells). At the protein and transcript level, the resulting NGN2 induced sensory neurons (NGN2iSNs) express sensory neuron markers such as BRN3A (82% BRN3A+ cells), ISLET1 (91% ISLET1+ cells), TRKA, TRKB, and TRKC. Importantly, NGN2iSNs repetitively fire action potentials (APs) supported by voltage-gated sodium, potassium, and calcium conductances. In-depth analysis of the molecular basis of NGN2iSN excitability revealed functional expression of ion channels associated with the excitability of primary afferent neurons, such as Nav1.7, Nav1.8, Kv1.2, Kv2.1, BK, Cav2.1, Cav2.2, Cav3.2, ASICs and HCN among other ion channels, for which we provide functional and transcriptional evidence. Our characterization of stem cell-derived sensory neurons sheds light on the molecular basis of human sensory physiology and highlights the suitability of using hPSC-derived sensory neurons for modeling human DRG development and their potential in the study of human peripheral neuropathies and drug therapies.
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Affiliation(s)
- Amy J Hulme
- Illawarra Health and Medical Research Institute, Wollongong, NSW, Australia.,School of Medicine, University of Wollongong, Wollongong, NSW, Australia
| | - Jeffrey R McArthur
- Illawarra Health and Medical Research Institute, Wollongong, NSW, Australia.,School of Medicine, University of Wollongong, Wollongong, NSW, Australia
| | - Simon Maksour
- Illawarra Health and Medical Research Institute, Wollongong, NSW, Australia.,School of Medicine, University of Wollongong, Wollongong, NSW, Australia
| | - Sara Miellet
- Illawarra Health and Medical Research Institute, Wollongong, NSW, Australia.,School of Medicine, University of Wollongong, Wollongong, NSW, Australia
| | - Lezanne Ooi
- Illawarra Health and Medical Research Institute, Wollongong, NSW, Australia.,School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, NSW, Australia.,Molecular Horizons, University of Wollongong, Wollongong, NSW, Australia
| | - David J Adams
- Illawarra Health and Medical Research Institute, Wollongong, NSW, Australia.,School of Medicine, University of Wollongong, Wollongong, NSW, Australia.,Molecular Horizons, University of Wollongong, Wollongong, NSW, Australia
| | - Rocio K Finol-Urdaneta
- Illawarra Health and Medical Research Institute, Wollongong, NSW, Australia.,School of Medicine, University of Wollongong, Wollongong, NSW, Australia
| | - Mirella Dottori
- Illawarra Health and Medical Research Institute, Wollongong, NSW, Australia.,School of Medicine, University of Wollongong, Wollongong, NSW, Australia.,Molecular Horizons, University of Wollongong, Wollongong, NSW, Australia
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17
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Smith PA. K + Channels in Primary Afferents and Their Role in Nerve Injury-Induced Pain. Front Cell Neurosci 2020; 14:566418. [PMID: 33093824 PMCID: PMC7528628 DOI: 10.3389/fncel.2020.566418] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 08/21/2020] [Indexed: 12/12/2022] Open
Abstract
Sensory abnormalities generated by nerve injury, peripheral neuropathy or disease are often expressed as neuropathic pain. This type of pain is frequently resistant to therapeutic intervention and may be intractable. Numerous studies have revealed the importance of enduring increases in primary afferent excitability and persistent spontaneous activity in the onset and maintenance of peripherally induced neuropathic pain. Some of this activity results from modulation, increased activity and /or expression of voltage-gated Na+ channels and hyperpolarization-activated cyclic nucleotide–gated (HCN) channels. K+ channels expressed in dorsal root ganglia (DRG) include delayed rectifiers (Kv1.1, 1.2), A-channels (Kv1.4, 3.3, 3.4, 4.1, 4.2, and 4.3), KCNQ or M-channels (Kv7.2, 7.3, 7.4, and 7.5), ATP-sensitive channels (KIR6.2), Ca2+-activated K+ channels (KCa1.1, 2.1, 2.2, 2.3, and 3.1), Na+-activated K+ channels (KCa4.1 and 4.2) and two pore domain leak channels (K2p; TWIK related channels). Function of all K+ channel types is reduced via a multiplicity of processes leading to altered expression and/or post-translational modification. This also increases excitability of DRG cell bodies and nociceptive free nerve endings, alters axonal conduction and increases neurotransmitter release from primary afferent terminals in the spinal dorsal horn. Correlation of these cellular changes with behavioral studies provides almost indisputable evidence for K+ channel dysfunction in the onset and maintenance of neuropathic pain. This idea is underlined by the observation that selective impairment of just one subtype of DRG K+ channel can produce signs of pain in vivo. Whilst it is established that various mediators, including cytokines and growth factors bring about injury-induced changes in DRG function and excitability, evidence presently available points to a seminal role for interleukin 1β (IL-1β) in control of K+ channel function. Despite the current state of knowledge, attempts to target K+ channels for therapeutic pain management have met with limited success. This situation may change with the advent of personalized medicine. Identification of specific sensory abnormalities and genetic profiling of individual patients may predict therapeutic benefit of K+ channel activators.
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Affiliation(s)
- Peter A Smith
- Department of Pharmacology and Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB, Canada
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18
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Chua VM, Gajewiak J, Watkins M, Espino SS, Ramiro IBL, Omaga CA, Imperial JS, Carpio LPD, Fedosov A, Safavi-Hemami H, Salvador-Reyes LA, Olivera BM, Concepcion GP. Purification and Characterization of the Pink-Floyd Drillipeptide, a Bioactive Venom Peptide from Clavus davidgilmouri (Gastropoda: Conoidea: Drilliidae). Toxins (Basel) 2020; 12:toxins12080508. [PMID: 32784699 PMCID: PMC7472735 DOI: 10.3390/toxins12080508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 08/01/2020] [Accepted: 08/04/2020] [Indexed: 12/01/2022] Open
Abstract
The cone snails (family Conidae) are the best known and most intensively studied venomous marine gastropods. However, of the total biodiversity of venomous marine mollusks (superfamily Conoidea, >20,000 species), cone snails comprise a minor fraction. The venoms of the family Drilliidae, a highly diversified family in Conoidea, have not previously been investigated. In this report, we provide the first biochemical characterization of a component in a Drilliidae venom and define a gene superfamily of venom peptides. A bioactive peptide, cdg14a, was purified from the venom of Clavus davidgilmouri Fedosov and Puillandre, 2020. The peptide is small (23 amino acids), disulfide-rich (4 cysteine residues) and belongs to the J-like drillipeptide gene superfamily. Other members of this superfamily share a conserved signal sequence and the same arrangement of cysteine residues in their predicted mature peptide sequences. The cdg14a peptide was chemically synthesized in its bioactive form. It elicited scratching and hyperactivity, followed by a paw-thumping phenotype in mice. Using the Constellation Pharmacology platform, the cdg14a drillipeptide was shown to cause increased excitability in a majority of non-peptidergic nociceptors, but did not affect other subclasses of dorsal root ganglion (DRG) neurons. This suggests that the cdg14a drillipeptide may be blocking a specific molecular isoform of potassium channels. The potency and selectivity of this biochemically characterized drillipeptide suggest that the venoms of the Drilliidae are a rich source of novel and selective ligands for ion channels and other important signaling molecules in the nervous system.
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Affiliation(s)
- Victor M. Chua
- The Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines; (V.M.C.); (I.B.L.R.); (C.A.O.); (L.P.D.C.); (L.A.S.-R.)
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA; (J.G.); (M.W.); (S.S.E.); (J.S.I.); (H.S.-H.); (B.M.O.)
| | - Joanna Gajewiak
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA; (J.G.); (M.W.); (S.S.E.); (J.S.I.); (H.S.-H.); (B.M.O.)
| | - Maren Watkins
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA; (J.G.); (M.W.); (S.S.E.); (J.S.I.); (H.S.-H.); (B.M.O.)
| | - Samuel S. Espino
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA; (J.G.); (M.W.); (S.S.E.); (J.S.I.); (H.S.-H.); (B.M.O.)
| | - Iris Bea L. Ramiro
- The Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines; (V.M.C.); (I.B.L.R.); (C.A.O.); (L.P.D.C.); (L.A.S.-R.)
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA; (J.G.); (M.W.); (S.S.E.); (J.S.I.); (H.S.-H.); (B.M.O.)
- Department of Biomedical Sciences, University of Copenhagen, 2200 Copenhagen N, Denmark
| | - Carla A. Omaga
- The Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines; (V.M.C.); (I.B.L.R.); (C.A.O.); (L.P.D.C.); (L.A.S.-R.)
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA; (J.G.); (M.W.); (S.S.E.); (J.S.I.); (H.S.-H.); (B.M.O.)
| | - Julita S. Imperial
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA; (J.G.); (M.W.); (S.S.E.); (J.S.I.); (H.S.-H.); (B.M.O.)
| | - Louie Paolo D. Carpio
- The Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines; (V.M.C.); (I.B.L.R.); (C.A.O.); (L.P.D.C.); (L.A.S.-R.)
| | - Alexander Fedosov
- Severstov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky prospect 33, Moscow 119071, Russia;
| | - Helena Safavi-Hemami
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA; (J.G.); (M.W.); (S.S.E.); (J.S.I.); (H.S.-H.); (B.M.O.)
- Department of Biomedical Sciences, University of Copenhagen, 2200 Copenhagen N, Denmark
- Department of Biochemistry, University of Utah, Salt Lake City, UT 84112, USA
| | - Lilibeth A. Salvador-Reyes
- The Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines; (V.M.C.); (I.B.L.R.); (C.A.O.); (L.P.D.C.); (L.A.S.-R.)
| | - Baldomero M. Olivera
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA; (J.G.); (M.W.); (S.S.E.); (J.S.I.); (H.S.-H.); (B.M.O.)
| | - Gisela P. Concepcion
- The Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines; (V.M.C.); (I.B.L.R.); (C.A.O.); (L.P.D.C.); (L.A.S.-R.)
- Correspondence:
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19
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Graham RD, Bruns TM, Duan B, Lempka SF. The Effect of Clinically Controllable Factors on Neural Activation During Dorsal Root Ganglion Stimulation. Neuromodulation 2020; 24:655-671. [PMID: 32583523 DOI: 10.1111/ner.13211] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 05/08/2020] [Accepted: 05/10/2020] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Dorsal root ganglion stimulation (DRGS) is an effective therapy for chronic pain, though its mechanisms of action are unknown. Currently, we do not understand how clinically controllable parameters (e.g., electrode position, stimulus pulse width) affect the direct neural response to DRGS. Therefore, the goal of this study was to utilize a computational modeling approach to characterize how varying clinically controllable parameters changed neural activation profiles during DRGS. MATERIALS AND METHODS We coupled a finite element model of a human L5 DRG to multicompartment models of primary sensory neurons (i.e., Aα-, Aβ-, Aδ-, and C-neurons). We calculated the stimulation amplitudes necessary to elicit one or more action potentials in each neuron, and examined how neural activation profiles were affected by varying clinically controllable parameters. RESULTS In general, DRGS predominantly activated large myelinated Aα- and Aβ-neurons. Shifting the electrode more than 2 mm away from the ganglion abolished most DRGS-induced neural activation. Increasing the stimulus pulse width to 500 μs or greater increased the number of activated Aδ-neurons, while shorter pulse widths typically only activated Aα- and Aβ-neurons. Placing a cathode near a nerve root, or an anode near the ganglion body, maximized Aβ-mechanoreceptor activation. Guarded active contact configurations did not activate more Aβ-mechanoreceptors than conventional bipolar configurations. CONCLUSIONS Our results suggest that DRGS applied with stimulation parameters within typical clinical ranges predominantly activates Aβ-mechanoreceptors. In general, varying clinically controllable parameters affects the number of Aβ-mechanoreceptors activated, although longer pulse widths can increase Aδ-neuron activation. Our data support several Neuromodulation Appropriateness Consensus Committee guidelines on the clinical implementation of DRGS.
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Affiliation(s)
- Robert D Graham
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA.,Biointerfaces Institute, University of Michigan, Ann Arbor, MI, USA
| | - Tim M Bruns
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA.,Biointerfaces Institute, University of Michigan, Ann Arbor, MI, USA
| | - Bo Duan
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, USA
| | - Scott F Lempka
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA.,Biointerfaces Institute, University of Michigan, Ann Arbor, MI, USA.,Department of Anesthesiology, University of Michigan, Ann Arbor, MI, USA
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20
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Torres JP, Lin Z, Fenton DS, Leavitt LU, Niu C, Lam PY, Robes JM, Peterson RT, Concepcion GP, Haygood MG, Olivera BM, Schmidt EW. Boholamide A, an APD-Class, Hypoxia-Selective Cyclodepsipeptide. JOURNAL OF NATURAL PRODUCTS 2020; 83:1249-1257. [PMID: 32186874 PMCID: PMC10172148 DOI: 10.1021/acs.jnatprod.0c00038] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Calcium homeostasis is implicated in some cancers, leading to the possibility that selective control of calcium might lead to new cancer drugs. On the basis of this idea, we designed an assay using a glioblastoma cell line and screened a collection of 1000 unique bacterial extracts. Isolation of the active compound from a hit extract led to the identification of boholamide A (1), a 4-amido-2,4-pentadieneoate (APD)-class peptide. Boholamide A (1) applied in the nanomolar range induces an immediate influx of Ca2+ in glioblastoma and neuronal cells. APD-class natural products are hypoxia-selective cytotoxins that primarily target mitochondria. Like other APD-containing compounds, 1 is hypoxia selective. Since APD natural products have received significant interest as potential chemotherapeutic agents, 1 provides a novel APD scaffold for the development of new anticancer compounds.
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Affiliation(s)
- Joshua P Torres
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Zhenjian Lin
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - David S Fenton
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Lee U Leavitt
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Changshan Niu
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Pui-Ying Lam
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84112, United States
| | - Jose Miguel Robes
- The Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines
| | - Randall T Peterson
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84112, United States
| | - Gisela P Concepcion
- The Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines
| | - Margo G Haygood
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Baldomero M Olivera
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Eric W Schmidt
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
- School of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
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21
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Finol-Urdaneta RK, Belovanovic A, Micic-Vicovac M, Kinsella GK, McArthur JR, Al-Sabi A. Marine Toxins Targeting Kv1 Channels: Pharmacological Tools and Therapeutic Scaffolds. Mar Drugs 2020; 18:E173. [PMID: 32245015 PMCID: PMC7143316 DOI: 10.3390/md18030173] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 03/15/2020] [Accepted: 03/16/2020] [Indexed: 12/11/2022] Open
Abstract
Toxins from marine animals provide molecular tools for the study of many ion channels, including mammalian voltage-gated potassium channels of the Kv1 family. Selectivity profiling and molecular investigation of these toxins have contributed to the development of novel drug leads with therapeutic potential for the treatment of ion channel-related diseases or channelopathies. Here, we review specific peptide and small-molecule marine toxins modulating Kv1 channels and thus cover recent findings of bioactives found in the venoms of marine Gastropod (cone snails), Cnidarian (sea anemones), and small compounds from cyanobacteria. Furthermore, we discuss pivotal advancements at exploiting the interaction of κM-conotoxin RIIIJ and heteromeric Kv1.1/1.2 channels as prevalent neuronal Kv complex. RIIIJ's exquisite Kv1 subtype selectivity underpins a novel and facile functional classification of large-diameter dorsal root ganglion neurons. The vast potential of marine toxins warrants further collaborative efforts and high-throughput approaches aimed at the discovery and profiling of Kv1-targeted bioactives, which will greatly accelerate the development of a thorough molecular toolbox and much-needed therapeutics.
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Affiliation(s)
- Rocio K. Finol-Urdaneta
- Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW 2522, Australia;
- Electrophysiology Facility for Cell Phenotyping and Drug Discovery, Wollongong, NSW 2522, Australia
| | - Aleksandra Belovanovic
- College of Engineering and Technology, American University of the Middle East, Kuwait; (A.B.); (M.M.-V.)
| | - Milica Micic-Vicovac
- College of Engineering and Technology, American University of the Middle East, Kuwait; (A.B.); (M.M.-V.)
| | - Gemma K. Kinsella
- School of Food Science and Environmental Health, College of Sciences and Health, Technological University Dublin, D07 ADY7 Dublin, Ireland;
| | - Jeffrey R. McArthur
- Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW 2522, Australia;
| | - Ahmed Al-Sabi
- College of Engineering and Technology, American University of the Middle East, Kuwait; (A.B.); (M.M.-V.)
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