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Do HQ, Pirayesh E, Ferreira G, Pandhare A, Gallardo ZR, Jansen M. A bupropion modulatory site in the Gloeobacter violaceus ligand-gated ion channel. Biophys J 2024; 123:2185-2198. [PMID: 38678367 PMCID: PMC11309978 DOI: 10.1016/j.bpj.2024.04.027] [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: 10/09/2023] [Revised: 01/27/2024] [Accepted: 04/25/2024] [Indexed: 04/29/2024] Open
Abstract
Bupropion is an atypical antidepressant and smoking cessation drug that causes adverse effects such as insomnia, irritability, and anxiety. Bupropion inhibits dopamine and norepinephrine reuptake transporters and eukaryotic cation-conducting pentameric ligand-gated ion channels, such as nicotinic acetylcholine and serotonin type 3A receptors, at clinically relevant concentrations. Here, we demonstrate that bupropion also inhibits a prokaryotic homolog of pentameric ligand-gated ion channels, the Gloeobacter violaceus ligand-gated ion channel (GLIC). Using the GLIC as a model, we used molecular docking to predict binding sites for bupropion. Bupropion was found to bind to several sites within the transmembrane domain, with the predominant site being localized to the interface between transmembrane segments M1 and M3 of two adjacent subunits. Residues W213, T214, and W217 in the first transmembrane segment, M1, and F267 and I271 in the third transmembrane segment, M3, most frequently reside within a 4 Å distance from bupropion. We then used single amino acid substitutions at these positions and two-electrode voltage-clamp recordings to determine their impact on bupropion inhibitory effects. The substitution T214F alters bupropion potency by shifting the half-maximal inhibitory concentration to a 13-fold higher value compared to wild-type GLIC. Residue T214 is found within a previously identified binding pocket for neurosteroids and lipids in the GLIC. This intersubunit binding pocket is structurally conserved and almost identical to a binding pocket described for neurosteroids in γ-aminobutyric acid type A receptors. Our data thus suggest that the T214 that lines a previously identified lipophilic binding pocket in GLIC and γ-aminobutyric acid type A receptors is also a modulatory site for bupropion interaction with the GLIC.
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Affiliation(s)
- Hoa Quynh Do
- Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Elham Pirayesh
- Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Garren Ferreira
- Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Akash Pandhare
- Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Zackary Ryan Gallardo
- Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Michaela Jansen
- Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas.
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Chaabani S, Einum S, Jaspers VLB, Asimakopoulos AG, Zhang J, Muller E. Impact of the antidepressant Bupropion on the Dynamic Energy Budget of Daphnia magna. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 895:164984. [PMID: 37356764 DOI: 10.1016/j.scitotenv.2023.164984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 05/22/2023] [Accepted: 06/16/2023] [Indexed: 06/27/2023]
Abstract
Psychiatric drugs are considered among the emerging contaminants of concern in ecological risk assessment, due to their potential to disrupt homeostasis in aquatic organisms. Bupropion is an antidepressant that acts by selective reuptake inhibition of norepinephrine and dopamine. Little is known about this compound's effects on aquatic organisms, despite being detected in significant concentrations in both water and biota close to waste-water treatment plants and densely populated areas. Dynamic Energy Budget (DEB) models are flexible mechanistic tools that can be applied to understand toxic effects and extrapolate individual responses to higher biological levels and under untested environmental conditions. In this work, we used the stdDEB-TKTD (an application of the DEB theory to ecotoxicology) approach to investigate the possible physiological mode of action of Bupropion on the model organism Daphnia magna. Next, Dynamic Energy Budget Individual-Based Models (DEB-IBM) were used to extrapolate the results to the population level and to predict the combined effects of Bupropion exposure and food availability on the daphnids. Our results revealed an increasing negative effect of this antidepressant on the reproduction and survival of the animals with increasing concentration (0.004, 0.058, 0.58 and 58 μM). At the population level, we found that even the lowest used doses of Bupropion could reduce the population density and its reproductive output. The impacts are predicted to be stronger under limited food conditions.
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Affiliation(s)
- Safa Chaabani
- Centre for Biodiversity Dynamics, Department of Biology, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway.
| | - Sigurd Einum
- Centre for Biodiversity Dynamics, Department of Biology, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway
| | - Veerle L B Jaspers
- Department of Biology, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway
| | | | - Junjie Zhang
- Department of Chemistry, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway
| | - Erik Muller
- Department of Biology, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway; Marine Science Institute, University of California, Santa Barbara, CA 93116, USA; ibacon GmbH, Arheilger Weg 17, D-6430 Rossdorf, Germany
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Pirayesh E, Do HQ, Ferreira G, Pandhare A, Gallardo ZR, Jansen M. Identification of a binding site for bupropion in Gloeobacter violaceus ligand-gated ion channel. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.09.561596. [PMID: 37873398 PMCID: PMC10592773 DOI: 10.1101/2023.10.09.561596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Bupropion is an atypical antidepressant and smoking cessation drug which causes adverse effects such as insomnia, irritability, and anxiety. Bupropion inhibits dopamine and norepinephrine reuptake transporters and eukaryotic cation-conducting pentameric ligand-gated ion channels (pLGICs), such as nicotinic acetylcholine (nACh) and serotonin type 3A (5-HT3A) receptors, at clinically relevant concentrations. However, the binding sites and binding mechanisms of bupropion are still elusive. To further understand the inhibition of pLGICs by bupropion, in this work, using a prokaryotic homologue of pLGICs as a model, we examined the inhibitory potency of bupropion in Gloeobacter violaceus ligand-gated ion channel (GLIC), a proton-gated ion channel. Bupropion inhibited proton-induced currents in GLIC with an inhibitory potency of 14.9 ± 2.0 μM, comparable to clinically attainable concentrations previously shown to also modulate eukaryotic pLGICs. Using single amino acid substitutions in GLIC and two-electrode voltage-clamp recordings, we further determined a binding site for bupropion in the lower third of the first transmembrane segment M1 at residue T214. The sidechain of M1 T214 together with additional residues of M1 and also of M3 of the adjacent subunit have previously been shown to contribute to binding of other lipophilic molecules like allopregnanolone and pregnanolone.
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Affiliation(s)
- Elham Pirayesh
- Medical Student Summer Research Program, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, 79430 USA
| | - Hoa Quynh Do
- Medical Student Summer Research Program, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, 79430 USA
| | - Garren Ferreira
- Medical Student Summer Research Program, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, 79430 USA
| | - Akash Pandhare
- Medical Student Summer Research Program, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, 79430 USA
| | - Zackary Ryan Gallardo
- Medical Student Summer Research Program, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, 79430 USA
| | - Michaela Jansen
- Medical Student Summer Research Program, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, 79430 USA
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Abreu TM, Corpe FP, Teles FB, da Conceição Rivanor RL, de Sousa CNS, da Silva Medeiros I, de Queiroz INL, Figueira-Mansur J, Mota ÉF, Mohana-Borges R, Macedo DS, de Vasconcelos SMM, Júnior JERH, Benevides NMB. Lectin isolated from the red marine alga Solieria filiformis (Kützing) P.W. Gabrielson: Secondary structure and antidepressant-like effect in mice submitted to the lipopolysaccharide-induced inflammatory model of depression. ALGAL RES 2022. [DOI: 10.1016/j.algal.2022.102715] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Abstract
Many patients under treatment for mood disorders, in particular patients with bipolar mood disorders, experience episodes of mood switching from one state to another. Various hypotheses have been proposed to explain the mechanism of mood switching, spontaneously or induced by drug treatment. Animal models have also been used to test the role of psychotropic drugs in the switching of mood states. We examine the possible relationship between the pharmacology of psychotropic drugs and their reported incidents of induced mood switching, with reference to the various hypotheses of mechanisms of mood switching.
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Karimollah A, Hemmatpur A, Vahid T. Revisiting bupropion anti-inflammatory action: involvement of the TLR2/TLR4 and JAK2/STAT3. Inflammopharmacology 2021; 29:1101-1109. [PMID: 34218389 DOI: 10.1007/s10787-021-00829-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 05/29/2021] [Indexed: 10/20/2022]
Abstract
There are accumulating reports regarding poor response to common antidepressant therapy. Antidepressant resistance is often linked to inflammatory system activation and patients displaying inflammation prior to the treatment are less responsive to antidepressants. We hypothesized that the inefficacy of antidepressant therapy in some patients may be attributable to the drugs' inflammatory mode of action, which has been overlooked because of their substantial therapeutic benefit. Bupropion is a commonly prescribed antidepressant that is often used to treat seasonal affective disorders as well. Nevertheless, research suggests that bupropion causes inflammation and worsens depressive symptoms. Therefore, we investigated the impact of bupropion on cytokines of innate and adaptive immunity, as well as immune signaling pathways. We treated lipopolysaccharide (LPS)-stimulated human peripheral blood mononuclear cells (PBMCs) with different doses of bupropion. Pro-/anti-inflammatory cytokines [tumor necrosis factor alpha (TNFα), interleukin-1β (IL-1β), IL-17, and IL-10] were assessed at both transcriptional and translational levels as well as the involvement of JAK2 /STAT3, TLR2, and TLR4 signaling in this process. Bupropion reduced IL-17A, TNFα, and IL-1β protein levels in the cultures. Nonetheless, bupropion increased IL-1β (P < 0.0001), TNFα (P < 0.0001), and IL-17A (P < 0.05) mRNA levels. Treatment enhanced both IL-10 concentration (P < 0.0001) and gene expression (P < 0.0001). TLR2 (P < 0.0001), TLR4 (P < 0.0001), JAK2 (P < 0.0001), and STAT3 (P < 0.0001) gene expression also rose in response to bupropion. The findings imply that bupropion, particularly 50 μM and 100 μM, has pro-inflammatory effects and should be co-administered with anti-inflammatory medications, at least in patients with inflammatory conditions.
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Affiliation(s)
- Alireza Karimollah
- Department of Pharmacology, School of Pharmacy, Shahid Sadoughi University of Medical Sciences and Health Services, Shohaday-e-Gomnam Blvd., Alem Sq., Yazd, Iran.
| | - Anahid Hemmatpur
- Department of Biochemistry, School of Medicine, Shahid Sadoughi University of Medical Sciences and Health Services, Shohaday-e-Gomnam Blvd., Alem Sq., Yazd, Iran
| | - Taha Vahid
- Department of Pharmacology, School of Pharmacy, Shahid Sadoughi University of Medical Sciences and Health Services, Shohaday-e-Gomnam Blvd., Alem Sq., Yazd, Iran
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Stuebler AG, Jansen M. Mobility of Lower MA-Helices for Ion Conduction through Lateral Portals in 5-HT 3A Receptors. Biophys J 2020; 119:2593-2603. [PMID: 33157122 PMCID: PMC7822733 DOI: 10.1016/j.bpj.2020.10.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 10/19/2020] [Accepted: 10/27/2020] [Indexed: 01/22/2023] Open
Abstract
The intracellular domain of the serotonin type 3A receptor, a pentameric ligand-gated ion channel, is crucial for regulating conductance. Ion permeation through the extracellular vestibule and the transmembrane channel is well understood, whereas the specific ion conduction pathway through the intracellular domain is less clear. The intracellular domain starts with a short loop after the third transmembrane segment, followed by a short α-helical segment, a large unstructured loop, and finally, the membrane-associated MA-helix that continues into the last transmembrane segment. The MA-helices from all five subunits form the extension of the transmembrane ion channel and shape what has been described as a “closed vestibule,” with their lateral portals obstructed by loops and their cytosolic ends forming a tight hydrophobic constriction. The question remains whether the lateral portals or cytosolic constriction conduct ions upon channel opening. In our study, we used disulfide bond formation between pairs of engineered cysteines to probe the proximity and mobility of segments of the MA-helices most distal to the membrane bilayer. Our results indicate that the proximity and orientation for cysteine pairs at I409C/R410C, in close proximity to the lateral windows, and L402C/L403C, at the cytosolic ends of the MA-helices, are conducive for disulfide bond formation. Although conformational changes associated with gating promote cross-linking for I409C/R410C, which in turn decreases channel currents, cross-linking of L402C/L403C is functionally silent in macroscopic currents. These results support the hypothesis that concerted conformational changes open the lateral portals for ion conduction, rendering ion conduction through the vertical portal unlikely.
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Affiliation(s)
- Antonia G Stuebler
- Department of Cell Physiology and Molecular Biophysics and Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Michaela Jansen
- Department of Cell Physiology and Molecular Biophysics and Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas.
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