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Marchese-Rojas M, Islas ÁA, Mancilla-Simbro C, Millan-PerezPeña L, León JS, Salinas-Stefanon EM. Inhibition of the Human Neuronal Sodium Channel Na v1.9 by Arachidonyl-2-Chloroethylamide, An Analogue of Anandamide in a hNa v1.9/rNa v1.4 Chimera, An Experimental and in Silico Study. Neuroscience 2023; 511:39-52. [PMID: 36156289 DOI: 10.1016/j.neuroscience.2022.09.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 08/12/2022] [Accepted: 09/16/2022] [Indexed: 01/23/2023]
Abstract
Cannabinoids regulate analgesia, which has aroused much interest in identifying new pharmacological therapies in the management of refractory pain. Voltage-gated Na+ channels (Navs) play an important role in inflammatory and neuropathic pain. In particular, Nav1.9 is involved in nociception and the understanding of its pharmacology has lagged behind because it is difficult to express in heterologous systems. Here, we utilized the chimeric channel hNav1.9_C4, that comprises the extracellular and transmembrane domains of hNav1.9, co-expressed with the ß1 subunit on CHO-K1 cells to characterize the electrophysiological effects of ACEA, a synthetic surrogate of the endogenous cannabinoid anandamide. ACEA induced a tonic block, decelerated the fast inactivation, markedly shifted steady-state inactivation in the hyperpolarized direction, decreasing the window current and showed use-dependent block, with a high affinity for the inactivated state (ki = 0.84 µM). Thus, we argue that ACEA possess a local anaesthetic-like profile. To provide a mechanistic understanding of its mode of action at the molecular level, we combined induced fit docking with Monte Carlo simulations and electrostatic complementarity. In agreement with the experimental evidence, our computer simulations revealed that ACEA binds Tyr1599 of the local anaesthetics binding site of the hNav1.9, contacting residues that bind cannabinol (CBD) in the NavMs channel. ACEA adopted a conformation remarkably similar to the crystallographic conformation of anandamide on a non-homologous protein, obstructing the Na+ permeation pathway below the selectivity filter to occupy a highly conserved binding pocket at the intracellular side. These results describe a mechanism of action, possibly involved in cannabinoid analgesia.
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Affiliation(s)
- Mario Marchese-Rojas
- Laboratory of Biophysics, Institute of Physiology, Benemérita Universidad Autónoma de Puebla, Mexico
| | - Ángel A Islas
- Vicerrectoría de Investigación y Estudios de Posgrado, Benemérita Universidad Autónoma de Puebla, Mexico; Laboratory of Computational Molecular Simulations, Department of Pharmacy, Benemérita Universidad Autónoma de Puebla, Mexico.
| | - Claudia Mancilla-Simbro
- Laboratory of Biophysics, Institute of Physiology, Benemérita Universidad Autónoma de Puebla, Mexico
| | | | - Jorge S León
- Laboratory of Biophysics, Institute of Physiology, Benemérita Universidad Autónoma de Puebla, Mexico
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Cellular targets of mefloquine. Toxicology 2021; 464:152995. [PMID: 34678321 DOI: 10.1016/j.tox.2021.152995] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/14/2021] [Accepted: 10/15/2021] [Indexed: 11/24/2022]
Abstract
Mefloquine is a quinoline-based compound widely used as an antimalarial drug, particularly in chemoprophylaxis. Although decades of research have identified various aspects of mefloquine's anti-Plasmodium properties, toxic effects offset its robust use in humans. Mefloquine exerts harmful effects in several types of human cells by targeting many of the cellular lipids, proteins, and complexes, thereby blocking a number of downstream signaling cascades. In general, mefloquine modulates several cellular phenomena, such as alteration of membrane potential, induction of oxidative stress, imbalance of ion homeostasis, disruption of metabolism, failure of organelle function, etc., leading to cell cycle arrest and programmed cell death. This review aims to summarize the information on functional and mechanistic findings related to the cytotoxic effects of mefloquine.
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3
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Martins AC, Paoliello MMB, Docea AO, Santamaria A, Tinkov AA, Skalny AV, Aschner M. Review of the mechanism underlying mefloquine-induced neurotoxicity. Crit Rev Toxicol 2021; 51:209-216. [PMID: 33905310 DOI: 10.1080/10408444.2021.1901258] [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: 12/19/2022]
Abstract
Mefloquine, a potent blood schizontocide, is effective against drug-resistant Plasmodium falciparum. This property, along with its unique pharmacokinetic profile, makes mefloquine a widely prescribed antimalarial drug. However, several epidemiological studies have raised concerns on the safety of mefloquine as prophylaxis for malaria. Well-documented side-effects of mefloquine include abnormal dreams, insomnia, anxiety, and depressed mood, as well as nausea and dizziness (the last two most frequent effects). The mechanisms that underlie the neurological/psychiatric complications of mefloquine are poorly understood. The aim of this study was to review the literature on the neurotoxic mechanisms of action of mefloquine to better understand its potential toxicity in the central nervous system, highlighting the mechanisms that lead to its psychiatric disorders. Experimental studies on the neurotoxic effects of mefloquine discussed herein include brain transporters of mefloquine, alteration in neurotransmitters, disruption on calcium (Ca2+) homeostasis and neuroinflammation, generation of oxidative stress response in neurons (involving glutathione, increased F2-isoprostanes, accumulation of cytosolic lipid globules), and alteration of voltage-dependent channels, as well as gap junction intercellular communications. Although several hypotheses have been proposed for the mechanisms that mediate mefloquine-induced brain damage, they are not fully understood, necessitating additional studies in the future.
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Affiliation(s)
- Airton C Martins
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Monica M B Paoliello
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Anca O Docea
- Department of Toxicology, University of Medicine and Pharmacy of Craiova, Craiova, Romania
| | - Abel Santamaria
- Laboratorio de Aminoacidos Excitadores, Instituto Nacional de Neurologia y Neurocirugia Manuel Velasco Suarez, Mexico City, Mexico
| | - Alexey A Tinkov
- I.M. Sechenov First, Moscow State Medical University (Sechenov University), Moscow, Russia.,KG Razumovsky Moscow State University of Technologies and Management, Moscow, Russia
| | - Anatoly V Skalny
- I.M. Sechenov First, Moscow State Medical University (Sechenov University), Moscow, Russia.,KG Razumovsky Moscow State University of Technologies and Management, Moscow, Russia
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA.,I.M. Sechenov First, Moscow State Medical University (Sechenov University), Moscow, Russia
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4
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Kumar A, Ghosh DK, Ranjan A. Differential Stabilities of Mefloquine-Bound Human and Plasmodium falciparum Acyl-CoA-Binding Proteins. ACS OMEGA 2021; 6:1883-1893. [PMID: 33521428 PMCID: PMC7841788 DOI: 10.1021/acsomega.0c04582] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 12/01/2020] [Indexed: 05/03/2023]
Abstract
Toxic effects of pharmacological drugs restrict their robust application against human diseases. Although used as a drug in the combinatorial therapy to treat malaria, the use of mefloquine is not highly recommended because of its adverse effects in humans. Mefloquine inhibits the binding of acyl-CoAs to acyl-CoA-binding proteins of Plasmodium falciparum (PfACBPs) and human (hACBP). In this study, we have used molecular dynamics simulation and other computational approaches to investigate the differences of stabilities of mefloquine-PfACBP749 and mefloquine-hACBP complexes. The stability of mefloquine in the binding cavity of PfACBP749 is less than its stability in the binding pocket of hACBP. Although the essential tyrosine residues (tyrosine-30 and tyrosine-33 of PfACBP749 and tyrosine-29 and tyrosine-32 of hACBP) mediate the initial binding of mefloquine to the proteins by π-stacking interactions, additional temporally longer interactions between mefloquine and aspartate-22 and methionine-25 of hACBP result in stronger binding of mefloquine to hACBP. The higher fluctuation of mefloquine-binding residues of PfACBP749 contributes to the instability of mefloquine in the binding cavity of the protein. On the contrary, in the mefloquine-bound state, the stability of hACBP protein is less than the stability of PfACBP749. The helix-to-coil transition of the N-terminal hydrophobic region of hACBP has a destabilizing effect upon the protein's structure. This causes the induction of aggregation properties in the hACBP in the mefloquine-bound state. Taken together, we describe the mechanistic features that affect the differential dynamic stabilities of mefloquine-bound PfACBP749 and hACBP proteins.
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Affiliation(s)
- Abhishek Kumar
- Computational
and Functional Genomics Group, Centre for
DNA Fingerprinting and Diagnostics, Uppal, Hyderabad, Telangana 500039, India
- Graduate
Studies, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Debasish Kumar Ghosh
- Computational
and Functional Genomics Group, Centre for
DNA Fingerprinting and Diagnostics, Uppal, Hyderabad, Telangana 500039, India
| | - Akash Ranjan
- Computational
and Functional Genomics Group, Centre for
DNA Fingerprinting and Diagnostics, Uppal, Hyderabad, Telangana 500039, India
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Dossi E, Blauwblomme T, Moulard J, Chever O, Vasile F, Guinard E, Le Bert M, Couillin I, Pallud J, Capelle L, Huberfeld G, Rouach N. Pannexin-1 channels contribute to seizure generation in human epileptic brain tissue and in a mouse model of epilepsy. Sci Transl Med 2019; 10:10/443/eaar3796. [PMID: 29848662 DOI: 10.1126/scitranslmed.aar3796] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 11/02/2017] [Accepted: 05/10/2018] [Indexed: 01/08/2023]
Abstract
Epilepsies are characterized by recurrent seizures, which disrupt normal brain function. Alterations in neuronal excitability and excitation-inhibition balance have been shown to promote seizure generation, yet molecular determinants of such alterations remain to be identified. Pannexin channels are nonselective, large-pore channels mediating extracellular exchange of neuroactive molecules. Recent data suggest that these channels are activated under pathological conditions and regulate neuronal excitability. However, whether pannexin channels sustain or counteract chronic epilepsy in human patients remains unknown. We studied the impact of pannexin-1 channel activation in postoperative human tissue samples from patients with epilepsy displaying epileptic activity ex vivo. These samples were obtained from surgical resection of epileptogenic zones in patients suffering from lesional or drug-resistant epilepsy. We found that pannexin-1 channel activation promoted seizure generation and maintenance through adenosine triphosphate signaling via purinergic 2 receptors. Pharmacological inhibition of pannexin-1 channels with probenecid or mefloquine-two medications currently used for treating gout and malaria, respectively-blocked ictal discharges in human cortical brain tissue slices. Genetic deletion of pannexin-1 channels in mice had anticonvulsant effects when the mice were exposed to kainic acid, a model of temporal lobe epilepsy. Our data suggest a proepileptic role of pannexin-1 channels in chronic epilepsy in human patients and that pannexin-1 channel inhibition might represent an alternative therapeutic strategy for treating lesional and drug-resistant epilepsies.
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Affiliation(s)
- Elena Dossi
- Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNR UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, 75005 Paris, France
| | - Thomas Blauwblomme
- Assistance Publique-Hopitaux de Paris (AP-HP), Department of Pediatric Neurosurgery, Necker Hospital, INSERM U1129, Paris Descartes University, PRES Sorbonne Paris Cité, 75015 Paris, France.,INSERM U1129, Paris Descartes University, PRES Sorbonne Paris Cité, CEA, 75015 Paris, France
| | - Julien Moulard
- Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNR UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, 75005 Paris, France
| | - Oana Chever
- Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNR UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, 75005 Paris, France
| | - Flora Vasile
- Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNR UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, 75005 Paris, France
| | - Eleonore Guinard
- Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNR UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, 75005 Paris, France.,INSERM U1129, Paris Descartes University, PRES Sorbonne Paris Cité, CEA, 75015 Paris, France
| | - Marc Le Bert
- CNRS UMR7355, Experimental and Molecular Immunology and Neurogenetics, 45067 Orléans, France
| | - Isabelle Couillin
- CNRS UMR7355, Experimental and Molecular Immunology and Neurogenetics, 45067 Orléans, France
| | - Johan Pallud
- Department of Neurosurgery, Sainte-Anne Hospital and IMA-BRAIN, INSERM U894, Paris Descartes University, PRES Sorbonne Paris Cité, 75014 Paris, France
| | - Laurent Capelle
- Department of Neurosurgery, University Pierre and Marie Curie, La Pitié-Salpêtrière Hospital, AP-HP, Sorbonne Universités, 75013 Paris, France
| | - Gilles Huberfeld
- Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNR UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, 75005 Paris, France.,INSERM U1129, Paris Descartes University, PRES Sorbonne Paris Cité, CEA, 75015 Paris, France.,Department of Neurophysiology, La Pitié-Salpetrière Hospital, Sorbonne Universités, University Pierre and Marie Curie, AP-HP, 75013 Paris, France
| | - Nathalie Rouach
- Neuroglial Interactions in Cerebral Physiopathology, Center for Interdisciplinary Research in Biology, Collège de France, CNR UMR 7241, INSERM U1050, Labex Memolife, PSL Research University, 75005 Paris, France.
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