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Tian J, Mallinger JC, Shi P, Ling D, Deleyrolle LP, Lin M, Khoshbouei H, Sarkisian MR. Aurora kinase A inhibition plus Tumor Treating Fields suppress glioma cell proliferation in a cilium-independent manner. Transl Oncol 2024; 45:101956. [PMID: 38640786 PMCID: PMC11053227 DOI: 10.1016/j.tranon.2024.101956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 03/25/2024] [Accepted: 04/02/2024] [Indexed: 04/21/2024] Open
Abstract
Tumor Treating Fields (TTFields) extend the survival of glioblastoma (GBM) patients by interfering with a broad range of tumor cellular processes. Among these, TTFields disrupt primary cilia stability on GBM cells. Here we asked if concomitant treatment of TTFields with other agents that interfere with GBM ciliogenesis further suppress GBM cell proliferation in vitro. Aurora kinase A (AURKA) promotes both cilia disassembly and GBM growth. Inhibitors of AURKA, such as Alisertib, inhibit cilia disassembly and increase ciliary frequency in various cell types. However, we found that Alisertib treatment significantly reduced GBM cilia frequency in gliomaspheres across multiple patient derived cell lines, and in patient biopsies treated ex vivo. This effect appeared glioma cell-specific as it did not reduce normal neuronal or glial cilia frequencies. Alisertib-mediated depletion of glioma cilia appears specific to AURKA and not AURKB inhibition, and attributable in part to autophagy pathway activation. Treatment of two different GBM patient-derived cell lines with TTFields and Alisertib resulted in a significant reduction in cell proliferation compared to either treatment alone. However, this effect was not cilia-dependent as the combined treatment reduced proliferation in cilia-depleted cell lines lacking, ARL13B, or U87MG cells which are naturally devoid of ARL13B+ cilia. Thus, Alisertib-mediated effects on glioma cilia may be a useful biomarker of drug efficacy within tumor tissue. Considering Alisertib can cross the blood brain barrier and inhibit intracranial growth, our data warrant future studies to explore whether concomitant Alisertib and TTFields exposure prolongs survival of brain tumor-bearing animals in vivo.
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Affiliation(s)
- Jia Tian
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL 32610, USA; Preston A. Wells Jr. Center for Brain Tumor Therapy, University of Florida College of Medicine, Gainesville, FL 32610, USA
| | - Julianne C Mallinger
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL 32610, USA; Preston A. Wells Jr. Center for Brain Tumor Therapy, University of Florida College of Medicine, Gainesville, FL 32610, USA
| | - Ping Shi
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL 32610, USA; Preston A. Wells Jr. Center for Brain Tumor Therapy, University of Florida College of Medicine, Gainesville, FL 32610, USA
| | - Dahao Ling
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL 32610, USA; Preston A. Wells Jr. Center for Brain Tumor Therapy, University of Florida College of Medicine, Gainesville, FL 32610, USA
| | - Loic P Deleyrolle
- Department of Neurosurgery, University of Florida College of Medicine, Gainesville, FL 32610, USA; Preston A. Wells Jr. Center for Brain Tumor Therapy, University of Florida College of Medicine, Gainesville, FL 32610, USA
| | - Min Lin
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL 32610, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL 32610, USA
| | - Matthew R Sarkisian
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL 32610, USA; Preston A. Wells Jr. Center for Brain Tumor Therapy, University of Florida College of Medicine, Gainesville, FL 32610, USA.
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Camacho-Hernandez G, Gopinath A, Okorom AV, Khoshbouei H, Newman AH. Development of a Fluorescently Labeled Ligand for Rapid Detection of DAT in Human and Mouse Peripheral Blood Monocytes. JACS Au 2024; 4:657-665. [PMID: 38425927 PMCID: PMC10900201 DOI: 10.1021/jacsau.3c00719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 01/05/2024] [Accepted: 01/08/2024] [Indexed: 03/02/2024]
Abstract
The dopamine transporter (DAT) is one of the key regulators of dopamine (DA) signaling in the central nervous system (CNS) and in the periphery. Recent reports in a model of Parkinson's disease (PD) have shown that dopamine neuronal loss in the CNS impacts the expression of DAT in peripheral immune cells. The mechanism underlying this connection is still unclear but could be illuminated with sensitive and high-throughput detection of DAT-expressing immune cells in the circulation. Herein, we have developed fluorescently labeled ligands (FLL) that bind to surface-expressing DAT with high affinity and selectivity. The diSulfoCy5-FLL (GC04-38) was utilized to label DAT in human and mouse peripheral blood mononuclear cells (PBMCs) that were analyzed via flow cytometry. Selective labeling was validated using DAT KO mouse PBMCs. Our studies provide an efficient and highly sensitive method using this novel DAT-selective FLL to advance our fundamental understanding of DAT expression and activity in PBMCs in health and disease and as a potential peripheral biomarker.
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Affiliation(s)
- Gisela
Andrea Camacho-Hernandez
- Medicinal
Chemistry Section, Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse − Intramural
Research Program, National Institutes of Health, Baltimore, Maryland 21224, United States
| | - Adithya Gopinath
- Department
of Neuroscience, University of Florida College
of Medicine, Gainesville, Florida 32611, United States
| | - Amarachi V. Okorom
- Medicinal
Chemistry Section, Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse − Intramural
Research Program, National Institutes of Health, Baltimore, Maryland 21224, United States
| | - Habibeh Khoshbouei
- Department
of Neuroscience, University of Florida College
of Medicine, Gainesville, Florida 32611, United States
| | - Amy Hauck Newman
- Medicinal
Chemistry Section, Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse − Intramural
Research Program, National Institutes of Health, Baltimore, Maryland 21224, United States
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Bu M, Follett J, Deng I, Tatarnikov I, Wall S, Guenther D, Maczis M, Wimsatt G, Milnerwood A, Moehle MS, Khoshbouei H, Farrer MJ. Inhibition of LRRK2 kinase activity rescues deficits in striatal dopamine physiology in VPS35 p.D620N knock-in mice. NPJ Parkinsons Dis 2023; 9:167. [PMID: 38110354 PMCID: PMC10728137 DOI: 10.1038/s41531-023-00609-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Accepted: 11/24/2023] [Indexed: 12/20/2023] Open
Abstract
Dysregulation of dopamine neurotransmission profoundly affects motor, motivation and learning behaviors, and can be observed during the prodromal phase of Parkinson's disease (PD). However, the mechanism underlying these pathophysiological changes remains to be elucidated. Mutations in vacuolar protein sorting 35 (VPS35) and leucine-rich repeat kinase 2 (LRRK2) both lead to autosomal dominant PD, and VPS35 and LRRK2 may physically interact to govern the trafficking of synaptic cargos within the endo-lysosomal network in a kinase-dependent manner. To better understand the functional role of VPS35 and LRRK2 on dopamine physiology, we examined Vps35 haploinsufficient (Haplo) and Vps35 p.D620N knock-in (VKI) mice and how their behavior, dopamine kinetics and biochemistry are influenced by LRRK2 kinase inhibitors. We found Vps35 p.D620N significantly elevates LRRK2-mediated phosphorylation of Rab10, Rab12 and Rab29. In contrast, Vps35 haploinsufficiency reduces phosphorylation of Rab12. While striatal dopamine transporter (DAT) expression and function is similarly impaired in both VKI and Haplo mice, that physiology is normalized in VKI by treatment with the LRRK2 kinase inhibitor, MLi-2. As a corollary, VKI animals show a significant increase in amphetamine induced hyperlocomotion, compared to Haplo mice, that is also abolished by MLi-2. Taken together, these data show Vps35 p.D620N confers a gain-of-function with respect to LRRK2 kinase activity, and that VPS35 and LRRK2 functionally interact to regulate DAT function and striatal dopamine transmission.
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Affiliation(s)
- Mengfei Bu
- Department of Neurology, University of Florida, Gainesville, FL, USA
- McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Jordan Follett
- Department of Neurology, University of Florida, Gainesville, FL, USA
- McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Isaac Deng
- Department of Neurology, University of Florida, Gainesville, FL, USA
- McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Igor Tatarnikov
- Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Shannon Wall
- Department of Neurology, University of Florida, Gainesville, FL, USA
- McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Dylan Guenther
- Department of Neurology, University of Florida, Gainesville, FL, USA
- McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Melissa Maczis
- Department of Neurology, University of Florida, Gainesville, FL, USA
- McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Genevieve Wimsatt
- Department of Neurology, University of Florida, Gainesville, FL, USA
- McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Austen Milnerwood
- Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
| | - Mark S Moehle
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL, USA
| | - Habibeh Khoshbouei
- McKnight Brain Institute, University of Florida, Gainesville, FL, USA
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | - Matthew J Farrer
- Department of Neurology, University of Florida, Gainesville, FL, USA.
- McKnight Brain Institute, University of Florida, Gainesville, FL, USA.
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Gopinath A, Riaz T, Miller E, Phan L, Smith A, Syed O, Franks S, Martinez LR, Khoshbouei H. Methamphetamine induces a low dopamine transporter expressing state without altering the total number of peripheral immune cells. Basic Clin Pharmacol Toxicol 2023; 133:496-507. [PMID: 36710070 PMCID: PMC10382601 DOI: 10.1111/bcpt.13838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 01/22/2023] [Accepted: 01/24/2023] [Indexed: 01/31/2023]
Abstract
Methamphetamine is a widely abused psychostimulant and one of the main targets of dopamine transporter (DAT). Methamphetamine reduces DAT-mediated dopamine uptake and stimulates dopamine efflux leading to increased synaptic dopamine levels many folds above baseline. Methamphetamine also targets DAT-expressing peripheral immune cells, reduces wound healing and increases infection susceptibility. Peripheral immune cells such as myeloid cells, B cells and T cells express DAT. DAT activity on monocytes and macrophages exhibits immune suppressive properties via an autocrine paracrine mechanism, where deletion or inhibition of DAT activity increases inflammatory responses. In this study, utilizing a mouse model of daily single dose of methamphetamine administration, we investigated the impact of the drug on DAT expression in peripheral immune cells. We found in methamphetamine-treated mice that DAT expression was down-regulated in most of the innate and adaptive immune cells. Methamphetamine did not increase or decrease the total number of innate and adaptive immune cells but changed their immunophenotype to low-DAT-expressing phenotype. Moreover, serum cytokine distributions were altered in methamphetamine-treated mice. Therefore, resembling its effect in the CNS, in the periphery, methamphetamine regulates DAT expression on peripheral immune cell subsets, potentially describing methamphetamine regulation of peripheral immunity.
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Affiliation(s)
- Adithya Gopinath
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Tabish Riaz
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Emily Miller
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Leah Phan
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Aidan Smith
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Ohee Syed
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Stephen Franks
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Luis R Martinez
- Department of Oral Biology, University of Florida College of Dentistry, Gainesville, Florida, USA
- Emerging Pathogens Institute, University of Florida, Gainesville, Florida, USA
- Center for Immunology and Transplantation, University of Florida, Gainesville, Florida, USA
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, Florida, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
- Center for Immunology and Transplantation, University of Florida, Gainesville, Florida, USA
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, Florida, USA
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5
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Mackie PM, Koshy J, Bhogade M, Hammoor T, Hachmeister W, Lloyd GM, Paterno G, Bolen M, Tansey MG, Giasson BI, Khoshbouei H. Complement C1q-dependent engulfment of alpha-synuclein induces ENS-resident macrophage exhaustion and accelerates Parkinson's-like gut pathology. bioRxiv 2023:2023.10.24.563832. [PMID: 37961460 PMCID: PMC10634831 DOI: 10.1101/2023.10.24.563832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Deposition of misfolded α-synuclein (αsyn) in the enteric nervous system (ENS) is found in multiple neurodegenerative diseases. It is hypothesized that ENS synucleinopathy contributes to both the pathogenesis and non-motor morbidity in Parkinson's Disease (PD), but the cellular and molecular mechanisms that shape enteric histopathology and dysfunction are poorly understood. Here, we demonstrate that ENS-resident macrophages, which play a critical role in maintaining ENS homeostasis, initially respond to enteric neuronal αsyn pathology by upregulating machinery for complement-mediated engulfment. Pharmacologic depletion of ENS-macrophages or genetic deletion of C1q enhanced enteric neuropathology. Conversely, C1q deletion ameliorated gut dysfunction, indicating that complement partially mediates αsyn-induced gut dysfunction. Internalization of αsyn led to increased endo-lysosomal stress that resulted in macrophage exhaustion and temporally correlated with the progression of ENS pathology. These novel findings highlight the importance of enteric neuron-macrophage interactions in removing toxic protein aggregates that putatively shape the earliest stages of PD in the periphery.
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Affiliation(s)
- P M Mackie
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
| | - J Koshy
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
| | - M Bhogade
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
| | - T Hammoor
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
| | - W Hachmeister
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
| | - G M Lloyd
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
- Center for Translational Research in Neurodegenerative Disease, University of Florida College of Medicine. Gainesville, FL, 32610
| | - G Paterno
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
- Center for Translational Research in Neurodegenerative Disease, University of Florida College of Medicine. Gainesville, FL, 32610
| | - M Bolen
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
- Center for Translational Research in Neurodegenerative Disease, University of Florida College of Medicine. Gainesville, FL, 32610
| | - M G Tansey
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
- Center for Translational Research in Neurodegenerative Disease, University of Florida College of Medicine. Gainesville, FL, 32610
- Department of Neurology and Fixel Institute for Neurological Diseases, University of Florida Health, Gainesville, Florida, 32610
| | - B I Giasson
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
- Center for Translational Research in Neurodegenerative Disease, University of Florida College of Medicine. Gainesville, FL, 32610
| | - H Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine. Gainesville, FL, 32610
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6
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Miller EJ, Khoshbouei H. Immunity on ice: The impact of methamphetamine on peripheral immunity. Adv Pharmacol 2023; 99:217-250. [PMID: 38467482 DOI: 10.1016/bs.apha.2023.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/13/2024]
Abstract
Methamphetamine (METH) regulation of the dopamine transporter (DAT) and central nervous system (CNS) dopamine transmission have been extensively studied. However, our understanding of how METH influences neuroimmune communication and innate and adaptive immunity is still developing. Recent studies have shed light on the bidirectional communication between the CNS and the peripheral immune system. They have established a link between CNS dopamine levels, dopamine neuronal activity, and peripheral immunity. Akin to dopamine neurons in the CNS, a majority of peripheral immune cells also express DAT, implying that in addition to their effect in the CNS, DAT ligands such as methamphetamine may have a role in modulating peripheral immunity. For example, by directly influencing DAT-expressing peripheral immune cells and thus peripheral immunity, METH can trigger a feed-forward cascade that impacts the bidirectional communication between the CNS and peripheral immune system. In this review, we aim to discuss the current understanding of how METH modulates both innate and adaptive immunity and identify areas where knowledge gaps exist. These gaps will then be considered in guiding future research directions.
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Affiliation(s)
- Emily J Miller
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, United States.
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, United States.
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Nutter CA, Kidd BM, Carter HA, Hamel JI, Mackie PM, Kumbkarni N, Davenport ML, Tuyn DM, Gopinath A, Creigh PD, Sznajder ŁJ, Wang ET, Ranum LPW, Khoshbouei H, Day JW, Sampson JB, Prokop S, Swanson MS. Choroid plexus mis-splicing and altered cerebrospinal fluid composition in myotonic dystrophy type 1. Brain 2023; 146:4217-4232. [PMID: 37143315 PMCID: PMC10545633 DOI: 10.1093/brain/awad148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 04/08/2023] [Accepted: 04/18/2023] [Indexed: 05/06/2023] Open
Abstract
Myotonic dystrophy type 1 is a dominantly inherited multisystemic disease caused by CTG tandem repeat expansions in the DMPK 3' untranslated region. These expanded repeats are transcribed and produce toxic CUG RNAs that sequester and inhibit activities of the MBNL family of developmental RNA processing factors. Although myotonic dystrophy is classified as a muscular dystrophy, the brain is also severely affected by an unusual cohort of symptoms, including hypersomnia, executive dysfunction, as well as early onsets of tau/MAPT pathology and cerebral atrophy. To address the molecular and cellular events that lead to these pathological outcomes, we recently generated a mouse Dmpk CTG expansion knock-in model and identified choroid plexus epithelial cells as particularly affected by the expression of toxic CUG expansion RNAs. To determine if toxic CUG RNAs perturb choroid plexus functions, alternative splicing analysis was performed on lateral and hindbrain choroid plexi from Dmpk CTG knock-in mice. Choroid plexus transcriptome-wide changes were evaluated in Mbnl2 knockout mice, a developmental-onset model of myotonic dystrophy brain dysfunction. To determine if transcriptome changes also occurred in the human disease, we obtained post-mortem choroid plexus for RNA-seq from neurologically unaffected (two females, three males; ages 50-70 years) and myotonic dystrophy type 1 (one female, three males; ages 50-70 years) donors. To test that choroid plexus transcriptome alterations resulted in altered CSF composition, we obtained CSF via lumbar puncture from patients with myotonic dystrophy type 1 (five females, five males; ages 35-55 years) and non-myotonic dystrophy patients (three females, four males; ages 26-51 years), and western blot and osmolarity analyses were used to test CSF alterations predicted by choroid plexus transcriptome analysis. We determined that CUG RNA induced toxicity was more robust in the lateral choroid plexus of Dmpk CTG knock-in mice due to comparatively higher Dmpk and lower Mbnl RNA levels. Impaired transitions to adult splicing patterns during choroid plexus development were identified in Mbnl2 knockout mice, including mis-splicing previously found in Dmpk CTG knock-in mice. Whole transcriptome analysis of myotonic dystrophy type 1 choroid plexus revealed disease-associated RNA expression and mis-splicing events. Based on these RNA changes, predicted alterations in ion homeostasis, secretory output and CSF composition were confirmed by analysis of myotonic dystrophy type 1 CSF. Our results implicate choroid plexus spliceopathy and concomitant alterations in CSF homeostasis as an unappreciated contributor to myotonic dystrophy type 1 CNS pathogenesis.
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Affiliation(s)
- Curtis A Nutter
- Department of Molecular Genetics and Microbiology, Center for NeuroGenetics and the Genetics Institute, University of Florida, College of Medicine, Gainesville, FL 32610, USA
| | - Benjamin M Kidd
- Department of Molecular Genetics and Microbiology, Center for NeuroGenetics and the Genetics Institute, University of Florida, College of Medicine, Gainesville, FL 32610, USA
| | - Helmut A Carter
- Department of Molecular Genetics and Microbiology, Center for NeuroGenetics and the Genetics Institute, University of Florida, College of Medicine, Gainesville, FL 32610, USA
| | - Johanna I Hamel
- Department of Neurology, University of Rochester, Rochester, NY 14642, USA
| | - Philip M Mackie
- Department of Neuroscience, McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Nayha Kumbkarni
- Department of Molecular Genetics and Microbiology, Center for NeuroGenetics and the Genetics Institute, University of Florida, College of Medicine, Gainesville, FL 32610, USA
| | - Mackenzie L Davenport
- Department of Molecular Genetics and Microbiology, Center for NeuroGenetics and the Genetics Institute, University of Florida, College of Medicine, Gainesville, FL 32610, USA
| | - Dana M Tuyn
- Department of Molecular Genetics and Microbiology, Center for NeuroGenetics and the Genetics Institute, University of Florida, College of Medicine, Gainesville, FL 32610, USA
| | - Adithya Gopinath
- Department of Neuroscience, McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Peter D Creigh
- Department of Neurology, University of Rochester, Rochester, NY 14642, USA
| | - Łukasz J Sznajder
- Department of Molecular Genetics and Microbiology, Center for NeuroGenetics and the Genetics Institute, University of Florida, College of Medicine, Gainesville, FL 32610, USA
| | - Eric T Wang
- Department of Molecular Genetics and Microbiology, Center for NeuroGenetics and the Genetics Institute, University of Florida, College of Medicine, Gainesville, FL 32610, USA
| | - Laura P W Ranum
- Department of Molecular Genetics and Microbiology, Center for NeuroGenetics and the Genetics Institute, McKnight Brain Institute and the Fixel Institute for Neurological Diseases, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - John W Day
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA 94304, USA
| | - Jacinda B Sampson
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA 94304, USA
| | - Stefan Prokop
- Department of Pathology, Immunology, and Laboratory Medicine, Center for Translational Research in Neurodegenerative Disease, McKnight Brain Institute and the Fixel Institute for Neurological Diseases, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Maurice S Swanson
- Department of Molecular Genetics and Microbiology, Center for NeuroGenetics and the Genetics Institute, University of Florida, College of Medicine, Gainesville, FL 32610, USA
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Larochelle J, Tishko RJ, Yang C, Ge Y, Phan LT, Gunraj RE, Stansbury SM, Liu L, Mohamadzadeh M, Khoshbouei H, Candelario-Jalil E. Receptor-interacting protein kinase 2 (RIPK2) profoundly contributes to post-stroke neuroinflammation and behavioral deficits with microglia as unique perpetrators. J Neuroinflammation 2023; 20:221. [PMID: 37777791 PMCID: PMC10543871 DOI: 10.1186/s12974-023-02907-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Accepted: 09/26/2023] [Indexed: 10/02/2023] Open
Abstract
BACKGROUND Receptor-interacting protein kinase 2 (RIPK2) is a serine/threonine kinase whose activity propagates inflammatory signaling through its association with pattern recognition receptors (PRRs) and subsequent TAK1, NF-κB, and MAPK pathway activation. After stroke, dead and dying cells release a host of damage-associated molecular patterns (DAMPs) that activate PRRs and initiate a robust inflammatory response. We hypothesize that RIPK2 plays a damaging role in the progression of stroke injury by enhancing the neuroinflammatory response to stroke and that global genetic deletion or microglia-specific conditional deletion of Ripk2 will be protective following ischemic stroke. METHODS Adult (3-6 months) male mice were subjected to 45 min of transient middle cerebral artery occlusion (tMCAO) followed by 24 h, 48 h, or 28 days of reperfusion. Aged male and female mice (18-24 months) were subjected to permanent ischemic stroke and sacrificed 48 h later. Infarct volumes were calculated using TTC staining (24-48 h) or Cresyl violet staining (28d). Sensorimotor tests (weight grip, vertical grid, and open field) were performed at indicated timepoints. Blood-brain barrier (BBB) damage, tight junction proteins, matrix metalloproteinase-9 (MMP-9), and neuroinflammatory markers were assessed via immunoblotting, ELISA, immunohistochemistry, and RT-qPCR. Differential gene expression profiles were generated through bulk RNA sequencing and nanoString®. RESULTS Global genetic deletion of Ripk2 resulted in decreased infarct sizes and reduced neuroinflammatory markers 24 h after stroke compared to wild-type controls. Ripk2 global deletion also improved both acute and long-term behavioral outcomes with powerful effects on reducing infarct volume and mortality at 28d post-stroke. Conditional deletion of microglial Ripk2 (mKO) partially recapitulated our results in global Ripk2 deficient mice, showing reductive effects on infarct volume and improved behavioral outcomes within 48 h of injury. Finally, bulk transcriptomic profiling and nanoString data demonstrated that Ripk2 deficiency in microglia decreases genes associated with MAPK and NF-κB signaling, dampening the neuroinflammatory response after stroke injury by reducing immune cell activation and peripheral immune cell invasion. CONCLUSIONS These results reveal a hitherto unknown role for RIPK2 in the pathogenesis of ischemic stroke injury, with microglia playing a distinct role. This study identifies RIPK2 as a potent propagator of neuroinflammatory signaling, highlighting its potential as a therapeutic target for post-stroke intervention.
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Affiliation(s)
- Jonathan Larochelle
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Ryland J Tishko
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Changjun Yang
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Yong Ge
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health, San Antonio, TX, USA
| | - Leah T Phan
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Rachel E Gunraj
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Sofia M Stansbury
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Lei Liu
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Mansour Mohamadzadeh
- Department of Microbiology, Immunology and Molecular Genetics, University of Texas Health, San Antonio, TX, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA
| | - Eduardo Candelario-Jalil
- Department of Neuroscience, McKnight Brain Institute, University of Florida, 1149 SW Newell Drive, Gainesville, FL, 32610, USA.
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9
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de Araujo AM, Braga I, Leme G, Singh A, McDougle M, Smith J, Vergara M, Yang M, Lin M, Khoshbouei H, Krause E, de Oliveira AG, de Lartigue G. Asymmetric control of food intake by left and right vagal sensory neurons. bioRxiv 2023:2023.05.08.539627. [PMID: 37214924 PMCID: PMC10197596 DOI: 10.1101/2023.05.08.539627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We investigated the lateralization of gut-innervating vagal sensory neurons and their roles in feeding behavior. Using genetic, anatomical, and behavioral analyses, we discovered a subset of highly lateralized vagal sensory neurons with distinct sensory responses to intestinal stimuli. Our results demonstrated that left vagal sensory neurons (LNG) are crucial for distension-induced satiety, while right vagal sensory neurons (RNG) mediate preference for nutritive foods. Furthermore, these lateralized neurons engage different central circuits, with LNG neurons recruiting brain regions associated with energy balance and RNG neurons activating areas related to salience, memory, and reward. Altogether, our findings unveil the diverse roles of asymmetrical gut-vagal-brain circuits in feeding behavior, offering new insights for potential therapeutic interventions targeting vagal nerve stimulation in metabolic and neuropsychiatric diseases.
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Affiliation(s)
- Alan Moreira de Araujo
- Monell Chemical Sense Center, Philadelphia, PA, USA
- Dept. Neuroscience, University of Pennsylvania, Philadelphia, USA
- Dept of Pharmacodynamics, University of Florida, Gainesville, USA
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, USA
| | - Isadora Braga
- Monell Chemical Sense Center, Philadelphia, PA, USA
- Dept. Neuroscience, University of Pennsylvania, Philadelphia, USA
- Dept of Pharmacodynamics, University of Florida, Gainesville, USA
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, USA
| | - Gabriel Leme
- Dept of Pharmacodynamics, University of Florida, Gainesville, USA
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, USA
| | - Arashdeep Singh
- Monell Chemical Sense Center, Philadelphia, PA, USA
- Dept. Neuroscience, University of Pennsylvania, Philadelphia, USA
- Dept of Pharmacodynamics, University of Florida, Gainesville, USA
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, USA
| | - Molly McDougle
- Monell Chemical Sense Center, Philadelphia, PA, USA
- Dept. Neuroscience, University of Pennsylvania, Philadelphia, USA
- Dept of Pharmacodynamics, University of Florida, Gainesville, USA
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, USA
| | - Justin Smith
- Dept of Pharmacodynamics, University of Florida, Gainesville, USA
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, USA
| | - Macarena Vergara
- Dept of Pharmacodynamics, University of Florida, Gainesville, USA
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, USA
| | - Mingxing Yang
- Monell Chemical Sense Center, Philadelphia, PA, USA
- Dept. Neuroscience, University of Pennsylvania, Philadelphia, USA
- Dept of Pharmacodynamics, University of Florida, Gainesville, USA
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, USA
| | - M Lin
- Dept of Neuroscience, University of Florida, Gainesville, USA
| | - H Khoshbouei
- Dept of Neuroscience, University of Florida, Gainesville, USA
| | - Eric Krause
- Dept of Pharmacodynamics, University of Florida, Gainesville, USA
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, USA
| | - Andre G de Oliveira
- Dept of Physiology and Biophysics, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Guillaume de Lartigue
- Monell Chemical Sense Center, Philadelphia, PA, USA
- Dept. Neuroscience, University of Pennsylvania, Philadelphia, USA
- Dept of Pharmacodynamics, University of Florida, Gainesville, USA
- Center for Integrative Cardiovascular and Metabolic Disease, University of Florida, Gainesville, USA
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10
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Tian J, Mallinger J, Shi P, Ling D, Deleyrolle L, Lin M, Khoshbouei H, Sarkisian M. Abstract 5961: Inhibition of AURKA destabilizes glioblastoma primary cilia and sensitizes cells to tumor treating fields (TTFields) in vitro and ex vivo. Cancer Res 2023. [DOI: 10.1158/1538-7445.am2023-5961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
Abstract
Abstract
Tumor Treating Fields (TTFields) can prolong survival of patients with glioblastoma (GBM), but GBM cells still escape this therapy requiring an urgent need for new or adjunct treatments. Recently we reported that TTFields disrupt primary cilia on GBM cells which lowers resistance to standard of care temozolomide chemotherapy. Here we asked if concomitant or sequential treatment of TTFields with other agents that interfere with GBM ciliogenesis enhance TTFields efficacy. Aurora Kinase A (AURKA) plays both a role in promoting cilia disassembly and regulating GBM growth in xenograft models. We found that within 24hr of treatment with the AURKA inhibitor, Alisertib, there was surprising and significant decrease in GBM cilia frequency across multiple GBM patient derived lines. However, similar Alisertib treatment did not affect neuronal or glial cilia frequencies in mixed primary cell cultures from mouse forebrain. Notably, overnight treatment of patient GBM biopsy ex vivo with Alisertib also resulted in reduced cilia frequency within the tumor tissue. Next, we co- or sequentially treated several different GBM patient cell lines with 24hr of 200kHz TTFields together with or followed by 250nM or 1µM Alisertib and examined the subsequent expansion of cells in vitro. We observed a significant synergistic reduction in cell proliferation compared to either treatment alone. However, this synergistic effect does not appear to be cilia-dependent as dual treatment reduction in proliferation was still observed in cell lines lacking different key cilia genes or in GBM cells that naturally lack cilia. Considering Alisertib crosses the blood brain barrier and inhibits intracranial growth of tumors, our data warrant investigation of whether concomitant or sequential treatment of TTFields and Alisertib in vivo can further prolong survival.
Citation Format: Jia Tian, Julianne Mallinger, Ping Shi, Dahao Ling, Loic Deleyrolle, Min Lin, Habibeh Khoshbouei, Matthew Sarkisian. Inhibition of AURKA destabilizes glioblastoma primary cilia and sensitizes cells to tumor treating fields (TTFields) in vitro and ex vivo [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 5961.
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Affiliation(s)
- Jia Tian
- 1University of Florida, Gainesville, FL
| | | | - Ping Shi
- 1University of Florida, Gainesville, FL
| | | | | | - Min Lin
- 1University of Florida, Gainesville, FL
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11
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Hamed MF, Enriquez V, Munzen ME, Charles-Niño CL, Mihu MR, Khoshbouei H, Alviña K, Martinez LR. Clinical and pathological characterization of Central Nervous System cryptococcosis in an experimental mouse model of stereotaxic intracerebral infection. PLoS Negl Trop Dis 2023; 17:e0011068. [PMID: 36656900 PMCID: PMC9888703 DOI: 10.1371/journal.pntd.0011068] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 01/31/2023] [Accepted: 01/02/2023] [Indexed: 01/20/2023] Open
Abstract
Infection of the Central Nervous System (CNS) by the encapsulated fungus Cryptococcus neoformans can lead to high mortality meningitis, most commonly in immunocompromised patients. While the mechanisms by which the fungus crosses the blood-brain barrier to initiate infection in the CNS are well recognized, there are still substantial unanswered questions about the disease progression once the fungus is established in the brain. C. neoformans is characterized by a glucuronoxylomannan (GXM)-rich polysaccharide capsule which has been implicated in immune evasion, but its role during the host CNS infection needs further elucidation. Therefore, the present study aims to examine these key questions about the mechanisms underlying cryptococcal meningitis progression and the impact of fungal GXM release by using an intracerebral rodent infection model via stereotaxic surgery. After developing brain infection, we analyzed distinct brain regions and found that while fungal load and brain weight were comparable one-week post-infection, there were region-specific histopathological (with and without brain parenchyma involvement) and disease manifestations. Moreover, we also observed a region-specific correlation between GXM accumulation and glial cell recruitment. Furthermore, mortality was associated with the presence of subarachnoid hemorrhaging and GXM deposition in the meningeal blood vessels and meninges in all regions infected. Our results show that using the present infection model can facilitate clinical and neuropathological observations during the progression of neurocryptococcosis. Importantly, this mouse model can be used to further investigate disease progression as it develops in humans.
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Affiliation(s)
- Mohamed F. Hamed
- Department of Oral Biology, University of Florida College of Dentistry, Gainesville, Florida, United States of America
- Department of Pathology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Vanessa Enriquez
- Department of Oral Biology, University of Florida College of Dentistry, Gainesville, Florida, United States of America
| | - Melissa E. Munzen
- Department of Oral Biology, University of Florida College of Dentistry, Gainesville, Florida, United States of America
| | - Claudia L. Charles-Niño
- Department of Oral Biology, University of Florida College of Dentistry, Gainesville, Florida, United States of America
- Department of Microbiology and Pathology, University Health Sciences Center, University of Guadalajara, Guadalajara, Mexico
| | - Mircea Radu Mihu
- Advanced Critical Care, Nazih Zuhdi Transplant Institute, Advanced Cardiac Care and 24/7 Shock Service, Integris Baptist Medical Center, Oklahoma City, Oklahoma, United States of America
- Department of Medicine/Cardiology, Oklahoma State University Health Science Center, Tulsa, Oklahoma, United States of America
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida, Gainesville, Florida, United States of America
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, United States of America
| | - Karina Alviña
- Department of Neuroscience, University of Florida, Gainesville, Florida, United States of America
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, United States of America
| | - Luis R. Martinez
- Department of Oral Biology, University of Florida College of Dentistry, Gainesville, Florida, United States of America
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, United States of America
- Center for Immunology and Transplantation, University of Florida, Gainesville, United States of America
- Emerging Pathogens Institute, University of Florida, Gainesville, Florida, United States of America
- * E-mail:
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12
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Gopinath A, Mackie PM, Phan LT, Mirabel R, Smith AR, Miller E, Franks S, Syed O, Riaz T, Law BK, Urs N, Khoshbouei H. Who Knew? Dopamine Transporter Activity Is Critical in Innate and Adaptive Immune Responses. Cells 2023; 12:cells12020269. [PMID: 36672204 PMCID: PMC9857305 DOI: 10.3390/cells12020269] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/22/2022] [Accepted: 01/04/2023] [Indexed: 01/12/2023] Open
Abstract
The dopamine transporter (DAT) regulates the dimension and duration of dopamine transmission. DAT expression, its trafficking, protein-protein interactions, and its activity are conventionally studied in the CNS and within the context of neurological diseases such as Parkinson's Diseases and neuropsychiatric diseases such as drug addiction, attention deficit hyperactivity and autism. However, DAT is also expressed at the plasma membrane of peripheral immune cells such as monocytes, macrophages, T-cells, and B-cells. DAT activity via an autocrine/paracrine signaling loop regulates macrophage responses to immune stimulation. In a recent study, we identified an immunosuppressive function for DAT, where blockade of DAT activity enhanced LPS-mediated production of IL-6, TNF-α, and mitochondrial superoxide levels, demonstrating that DAT activity regulates macrophage immune responses. In the current study, we tested the hypothesis that in the DAT knockout mice, innate and adaptive immunity are perturbed. We found that genetic deletion of DAT (DAT-/-) results in an exaggerated baseline inflammatory phenotype in peripheral circulating myeloid cells. In peritoneal macrophages obtained from DAT-/- mice, we identified increased MHC-II expression and exaggerated phagocytic response to LPS-induced immune stimulation, suppressed T-cell populations at baseline and following systemic endotoxemia and exaggerated memory B cell expansion. In DAT-/- mice, norepinephrine and dopamine levels are increased in spleen and thymus, but not in circulating serum. These findings in conjunction with spleen hypoplasia, increased splenic myeloid cells, and elevated MHC-II expression, in DAT-/- mice further support a critical role for DAT activity in peripheral immunity. While the current study is only focused on identifying the role of DAT in peripheral immunity, our data point to a much broader implication of DAT activity than previously thought. This study is dedicated to the memory of Dr. Marc Caron who has left an indelible mark in the dopamine transporter field.
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Affiliation(s)
- Adithya Gopinath
- Department of Neuroscience, University of Florida, Gainesville, FL 32611, USA
- Correspondence: (A.G.); (H.K.)
| | - Phillip M. Mackie
- Department of Neuroscience, University of Florida, Gainesville, FL 32611, USA
| | - Leah T. Phan
- Department of Neuroscience, University of Florida, Gainesville, FL 32611, USA
| | - Rosa Mirabel
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL 32611, USA
| | - Aidan R. Smith
- Department of Neuroscience, University of Florida, Gainesville, FL 32611, USA
| | - Emily Miller
- Department of Neuroscience, University of Florida, Gainesville, FL 32611, USA
| | - Stephen Franks
- Department of Neuroscience, University of Florida, Gainesville, FL 32611, USA
| | - Ohee Syed
- Department of Neuroscience, University of Florida, Gainesville, FL 32611, USA
| | - Tabish Riaz
- Department of Neuroscience, University of Florida, Gainesville, FL 32611, USA
| | - Brian K. Law
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL 32611, USA
| | - Nikhil Urs
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL 32611, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida, Gainesville, FL 32611, USA
- Correspondence: (A.G.); (H.K.)
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13
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Machado da Silva MC, Iglesias LP, Candelario-Jalil E, Khoshbouei H, Moreira FA, de Oliveira ACP. Role of Microglia in Psychostimulant Addiction. Curr Neuropharmacol 2023; 21:235-259. [PMID: 36503452 PMCID: PMC10190137 DOI: 10.2174/1570159x21666221208142151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 10/13/2022] [Accepted: 10/14/2022] [Indexed: 12/14/2022] Open
Abstract
The use of psychostimulant drugs can modify brain function by inducing changes in the reward system, mainly due to alterations in dopaminergic and glutamatergic transmissions in the mesocorticolimbic pathway. However, the etiopathogenesis of addiction is a much more complex process. Previous data have suggested that microglia and other immune cells are involved in events associated with neuroplasticity and memory, which are phenomena that also occur in addiction. Nevertheless, how dependent is the development of addiction on the activity of these cells? Although the mechanisms are not known, some pathways may be involved. Recent data have shown psychoactive substances may act directly on immune cells, alter their functions and induce various inflammatory mediators that modulate synaptic activity. These could, in turn, be involved in the pathological alterations that occur in substance use disorder. Here, we extensively review the studies demonstrating how cocaine and amphetamines modulate microglial number, morphology, and function. We also describe the effect of these substances in the production of inflammatory mediators and a possible involvement of some molecular signaling pathways, such as the toll-like receptor 4. Although the literature in this field is scarce, this review compiles the knowledge on the neuroimmune axis that is involved in the pathogenesis of addiction, and suggests some pharmacological targets for the development of pharmacotherapy.
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Affiliation(s)
- Maria Carolina Machado da Silva
- Department of Pharmacology, Neuropharmacology Laboratory, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil;
- Department of Neuroscience, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Lia Parada Iglesias
- Department of Pharmacology, Neuropsychopharmacology Laboratory, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | | | - Habibeh Khoshbouei
- Department of Neuroscience, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Fabrício Araujo Moreira
- Department of Pharmacology, Neuropsychopharmacology Laboratory, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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14
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Gaskill PJ, Khoshbouei H. Dopamine and norepinephrine are embracing their immune side and so should we. Curr Opin Neurobiol 2022; 77:102626. [PMID: 36058009 PMCID: PMC10481402 DOI: 10.1016/j.conb.2022.102626] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 07/26/2022] [Accepted: 07/29/2022] [Indexed: 01/10/2023]
Abstract
While the history of neuroimmunology is long, the explicit study of neuroimmune communication, and particularly the role of catecholamines in neuroimmunity, is still emerging. Recent studies have shown that catecholamines, norepinephrine, epinephrine, and dopamine, are central to multiple complex mechanisms regulating immune function. These studies show that catecholamines can be released from both the nervous system and directly from immune cells, mediating both autocrine and paracrine signaling. This commentary highlights the importance of catecholaminergic immunomodulation and discusses new considerations needed to study the role of catecholamines in immune homeostasis to best leverage their contribution to disease processes for the development of new therapeutic approaches.
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Affiliation(s)
- Peter J Gaskill
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, USA.
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, USA. https://twitter.com/Khoshbouei_lab
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15
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Ellison ST, Duraivel S, Subramaniam V, Hugosson F, Yu B, Lebowitz JJ, Khoshbouei H, Lele TP, Martindale MQ, Angelini TE. Cellular micromasonry: biofabrication with single cell precision. Soft Matter 2022; 18:8554-8560. [PMID: 36350122 DOI: 10.1039/d2sm01013e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
In many tissues, cell type varies over single-cell length-scales, creating detailed heterogeneities fundamental to physiological function. To gain understanding of the relationship between tissue function and detailed structure, and eventually to engineer structurally and physiologically accurate tissues, we need the ability to assemble 3D cellular structures having the level of detail found in living tissue. Here we introduce a method of 3D cell assembly having a level of precision finer than the single-cell scale. With this method we create detailed cellular patterns, demonstrating that cell type can be varied over the single-cell scale and showing function after their assembly.
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Affiliation(s)
- S Tori Ellison
- Department of Material Sciences and Engineering, University of Florida, Gainesville, Florida 32611, USA.
| | - Senthilkumar Duraivel
- Department of Material Sciences and Engineering, University of Florida, Gainesville, Florida 32611, USA.
| | - Vignesh Subramaniam
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611, USA
| | - Fredrik Hugosson
- The Whitney Laboratory for Marine Bioscience, St. Augustine, Florida 32080, USA
| | - Bo Yu
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA
| | - Joseph J Lebowitz
- Department of Neuroscience, University of Florida, Gainesville, Florida 32611, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida, Gainesville, Florida 32611, USA
| | - Tanmay P Lele
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, USA
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, USA
- Department of Translational Medical Sciences, Texas A&M University, Houston, Texas 77843, USA
| | - Mark Q Martindale
- The Whitney Laboratory for Marine Bioscience, St. Augustine, Florida 32080, USA
| | - Thomas E Angelini
- Department of Material Sciences and Engineering, University of Florida, Gainesville, Florida 32611, USA.
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611, USA
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, Florida 32611, USA
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16
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Shi P, Tian J, Ulm B, Mallinger J, Khoshbouei H, Deleyrolle L, Sarkisian M. Abstract 3252: Tumor treating fields suppression of ciliogenesis enhances temozolomide toxicity. Cancer Res 2022. [DOI: 10.1158/1538-7445.am2022-3252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Tumor Treating Fields (TTFields) are low intensity, alternating intermediate frequency (200kHz) electrical fields that extend survival of glioblastoma patients receiving maintenance temozolomide (TMZ) chemotherapy. How TTFields exert efficacy on cancer cells over normal cells, or interact with TMZ is unclear. Primary cilia are microtubule-based organelles triggered by extracellular ligands, mechanical and electrical field stimulation, and are capable of promoting cancer growth and TMZ chemoresistance. We found in both low and high grade patient glioma cell lines that TTFields ablated cilia within 24 hours. Halting TTFields treatment led to recovered frequencies of elongated cilia. Cilia on normal primary astrocytes, neurons and multiciliated ependymal cells were less affected by TTFields. The TTFields-mediated loss of glioma cilia was partially rescued by chloroquine pretreatment, suggesting the effect is in part due to autophagy activation. We also observed death of ciliated cells during TTFields by live imaging. Notably, TMZ-induced stimulation of ciliogenesis in both adherent cells and gliomaspheres was blocked by TTFields. Moreover, the inhibitory effects of TTFields and TMZ on tumor cell recurrence correlated with the relative timing of TMZ exposure to TTFields and ARL13B positive cilia. Finally, TTFields disrupted cilia in patient tumors treated ex vivo. Our findings suggest TTFields efficacy may depend on the degree of tumor ciliogenesis and relative timing of TMZ treatment.
Citation Format: Ping Shi, Jia Tian, Brittany Ulm, Julianne Mallinger, Habibeh Khoshbouei, Loic Deleyrolle, Matthew Sarkisian. Tumor treating fields suppression of ciliogenesis enhances temozolomide toxicity [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 3252.
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Affiliation(s)
- Ping Shi
- 1University of Florida, Gainesville, FL
| | - Jia Tian
- 1University of Florida, Gainesville, FL
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17
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Gopinath A, Mackie P, Hashimi B, Buchanan AM, Smith AR, Bouchard R, Shaw G, Badov M, Saadatpour L, Gittis A, Ramirez-Zamora A, Okun MS, Streit WJ, Hashemi P, Khoshbouei H. DAT and TH expression marks human Parkinson's disease in peripheral immune cells. NPJ Parkinsons Dis 2022; 8:72. [PMID: 35672374 PMCID: PMC9174333 DOI: 10.1038/s41531-022-00333-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 05/11/2022] [Indexed: 12/26/2022] Open
Abstract
Parkinson's disease (PD) is marked by a loss of dopamine neurons, decreased dopamine transporter (DAT) and tyrosine hydroxylase (TH) expression. However, this validation approach cannot be used for diagnostic, drug effectiveness or investigational purposes in human patients because midbrain tissue is accessible postmortem. PD pathology affects both the central nervous and peripheral immune systems. Therefore, we immunophenotyped blood samples of PD patients for the presence of myeloid derived suppressor cells (MDSCs) and discovered that DAT+/TH+ monocytic MDSCs, but not granulocytic MDSCs are increased, suggesting a targeted immune response to PD. Because in peripheral immune cells DAT activity underlies an immune suppressive mechanism, we investigated whether expression levels of DAT and TH in the peripheral immune cells marks PD. We found drug naïve PD patients exhibit differential DAT+/TH+ expression in peripheral blood mononuclear cells (PBMCs) compared to aged/sex matched healthy subjects. While total PBMCs are not different between the groups, the percentage of DAT+/TH+ PBMCs was significantly higher in drug naïve PD patients compared to healthy controls irrespective of age, gender, disease duration, disease severity or treatment type. Importantly, treatment for PD negatively modulates DAT+/TH+ expressing PBMCs. Neither total nor the percentage of DAT+/TH+ PBMCs were altered in the Alzheimer's disease cohort. The mechanistic underpinning of this discovery in human PD was revealed when these findings were recapitulated in animal models of PD. The reverse translational experimental strategy revealed that alterations in dopaminergic markers in peripheral immune cells are due to the disease associated changes in the CNS. Our study demonstrates that the dopaminergic machinery on peripheral immune cells displays an association with human PD, with exciting implications in facilitating diagnosis and investigation of human PD pathophysiology.
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Affiliation(s)
- Adithya Gopinath
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.
| | - Phillip Mackie
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | - Basil Hashimi
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | | | - Aidan R Smith
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | | | - Gerry Shaw
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
- EnCor Biotechnology, Inc, Gainesville, FL, USA
| | - Martin Badov
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | - Leila Saadatpour
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
- Department of Neurology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Aryn Gittis
- Carnegie Mellon University, Pittsburgh, PA, USA
| | - Adolfo Ramirez-Zamora
- Department of Neurology, Norman Fixel Institute for Neurological Diseases, UF Health, Gainesville, FL, USA
| | - Michael S Okun
- Department of Neurology, Norman Fixel Institute for Neurological Diseases, UF Health, Gainesville, FL, USA
| | - Wolfgang J Streit
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | - Parastoo Hashemi
- University of South Carolina, Columbia, SC, USA
- Department of Bioengineering, Imperial College, London, UK
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.
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18
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Shi P, Tian J, Ulm BS, Mallinger JC, Khoshbouei H, Deleyrolle LP, Sarkisian MR. Tumor Treating Fields Suppression of Ciliogenesis Enhances Temozolomide Toxicity. Front Oncol 2022; 12:837589. [PMID: 35359402 PMCID: PMC8962950 DOI: 10.3389/fonc.2022.837589] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 02/03/2022] [Indexed: 12/19/2022] Open
Abstract
Tumor Treating Fields (TTFields) are low-intensity, alternating intermediate-frequency (200 kHz) electrical fields that extend survival of glioblastoma patients receiving maintenance temozolomide (TMZ) chemotherapy. How TTFields exert efficacy on cancer over normal cells or interact with TMZ is unclear. Primary cilia are microtubule-based organelles triggered by extracellular ligands, mechanical and electrical field stimulation and are capable of promoting cancer growth and TMZ chemoresistance. We found in both low- and high-grade patient glioma cell lines that TTFields ablated cilia within 24 h. Halting TTFields treatment led to recovered frequencies of elongated cilia. Cilia on normal primary astrocytes, neurons, and multiciliated/ependymal cells were less affected by TTFields. The TTFields-mediated loss of glioma cilia was partially rescued by chloroquine pretreatment, suggesting the effect is in part due to autophagy activation. We also observed death of ciliated cells during TTFields by live imaging. Notably, TMZ and TTFields have opposing effects on glioma ciliogenesis. TMZ-induced stimulation of ciliogenesis in both adherent cells and gliomaspheres was blocked by TTFields. Surprisingly, the inhibitory effects of TTFields and TMZ on tumor cell recurrence are linked to the relative timing of TMZ exposure to TTFields and ARL13B+ cilia. Finally, TTFields disrupted cilia in patient tumors treated ex vivo. Our findings suggest that the efficacy of TTFields may depend on the degree of tumor ciliogenesis and relative timing of TMZ treatment.
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Affiliation(s)
- Ping Shi
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, United States
| | - Jia Tian
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, United States
| | - Brittany S. Ulm
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, United States
| | - Julianne C. Mallinger
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, United States
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, United States
| | - Loic P. Deleyrolle
- Department of Neurosurgery, University of Florida College of Medicine, Gainesville, FL, United States
- Preston A. Wells Jr. Center for Brain Tumor Therapy, University of Florida College of Medicine, Gainesville, FL, United States
| | - Matthew R. Sarkisian
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, United States
- Preston A. Wells Jr. Center for Brain Tumor Therapy, University of Florida College of Medicine, Gainesville, FL, United States
- *Correspondence: Matthew R. Sarkisian,
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19
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Hansen CA, Miller DR, Annarumma S, Rusch CT, Ramirez-Zamora A, Khoshbouei H. Levodopa-induced dyskinesia: a historical review of Parkinson's disease, dopamine, and modern advancements in research and treatment. J Neurol 2022; 269:2892-2909. [PMID: 35039902 DOI: 10.1007/s00415-022-10963-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/04/2022] [Accepted: 01/05/2022] [Indexed: 12/01/2022]
Abstract
Over the past two decades, animal models of Parkinson's disease (PD) have helped to determine the plausible underlying mechanism of levo-dihydroxyphenylalanine (L-DOPA)-induced dyskinesia following L-DOPA treatment. However, our understanding of the mechanisms related to this phenomenon remains incomplete. The purpose of this manuscript is to provide a comprehensive review of treatment protocols used for assessing the occurrence of L-DOPA-induced dyskinesia, L-DOPA absorption, distribution, drug/food interaction, and discuss current strategies and future directions. This review offers a historical perspective using L-DOPA in animal models of PD and the occurrence of L-DOPA-induced dyskinesia.
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Affiliation(s)
- Carissa A Hansen
- Department of Neuroscience, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Douglas R Miller
- Department of Neuroscience, College of Medicine, University of Florida, Gainesville, FL, USA.
| | - Stephanie Annarumma
- Food Science and Human Nutrition Department, University of Florida, Gainesville, FL, USA
| | - Carley T Rusch
- Food Science and Human Nutrition Department, University of Florida, Gainesville, FL, USA.,Department of Neurology, Norman Fixel Institute for Neurological Diseases, University of Florida, Gainesville, FL, USA
| | - Adolfo Ramirez-Zamora
- Department of Neurology, Norman Fixel Institute for Neurological Diseases, University of Florida, Gainesville, FL, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, College of Medicine, University of Florida, Gainesville, FL, USA.
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20
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Mackie PM, Gopinath A, Montas DM, Nielsen A, Smith A, Nolan RA, Runner K, Matt SM, McNamee J, Riklan JE, Adachi K, Doty A, Ramirez-Zamora A, Yan L, Gaskill PJ, Streit WJ, Okun MS, Khoshbouei H. Functional characterization of the biogenic amine transporters on human macrophages. JCI Insight 2022; 7:151892. [PMID: 35015729 PMCID: PMC8876465 DOI: 10.1172/jci.insight.151892] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 01/05/2022] [Indexed: 11/17/2022] Open
Abstract
Monocyte-derived macrophages are key players in tissue homeostasis and diseases regulated by a variety of signaling molecules. Recent literature has highlighted the ability for biogenic amines to regulate macrophage functions, but the mechanisms governing biogenic amine signaling in and around immune cells remains nebulous. In the central nervous system (CNS), biogenic amine transporters are regarded as the master regulators of neurotransmitter signaling. While we and others have shown that macrophages express these transporters, relatively little is known of their function in these cells. To address these knowledge gaps, we investigated the function of norepinephrine (NET) and dopamine (DAT) transporters on human monocyte-derived macrophages. We found that both NET and DAT are present and can uptake substrate from the extracellular space at baseline. Not only was DAT expressed in cultured monocyte-derived macrophages (MDMs), but it was also detected in a subset of intestinal macrophages in situ. Surprisingly, we discovered a NET-independent, DAT-mediated immuno-modulatory mechanism in response to lipopolysaccharide (LPS). LPS induced reverse transport of dopamine through DAT, engaging an autocrine/paracrine signaling loop that regulated the macrophage response. Removing this signaling loop enhanced the pro-inflammatory response to LPS. Collectively, our data introduce a potential role for DAT in the regulation of innate immunity.
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Affiliation(s)
- Phillip M Mackie
- Department of Neuroscience, University of Florida, Gainesville, United States of America
| | - Adithya Gopinath
- Department of Neuroscience, McKnight Brain Insitute, University of Florida College of Medicine, Gainesville, United States of America
| | - Dominic M Montas
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, United States of America
| | - Alyssa Nielsen
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, United States of America
| | - Aidan Smith
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, United States of America
| | - Rachel A Nolan
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, United States of America
| | - Kaitlyn Runner
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, United States of America
| | - Stephanie M Matt
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, United States of America
| | - John McNamee
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, United States of America
| | - Joshua E Riklan
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, United States of America
| | - Kengo Adachi
- Neuronal Signal Transduction Group, Max Plank Florida Institute for Neuroscience, Jupiter, United States of America
| | - Andria Doty
- Flow Cytometry Core Facility, University of Florida College of Medicine, Gainesville, United States of America
| | - Adolfo Ramirez-Zamora
- Department of Neurology, University of Florida College of Medicine, Gainesville, United States of America
| | - Long Yan
- Neuronal Signal Transduction Group, Max Plank Florida Institute for Neuroscience, Jupiter, United States of America
| | - Peter J Gaskill
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, United States of America
| | - Wolfgang J Streit
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, United States of America
| | - Michael S Okun
- University of Florida College of Medicine, Gainesville, United States of America
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, United States of America
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21
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Streit WJ, Rotter J, Winter K, Müller W, Khoshbouei H, Bechmann I. Droplet Degeneration of Hippocampal and Cortical Neurons Signifies the Beginning of Neuritic Plaque Formation. J Alzheimers Dis 2021; 85:1701-1720. [PMID: 34958037 DOI: 10.3233/jad-215334] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Neuritic plaques contain neural and microglial elements, and amyloid-β protein (Aβ), but their pathogenesis remains unknown. OBJECTIVE Elucidate neuritic plaque pathogenesis. METHODS Histochemical visualization of hyperphosphorylated-tau positive (p-tau+) structures, microglia, Aβ, and iron. RESULTS Disintegration of large projection neurons in human hippocampus and neocortex presents as droplet degeneration: pretangle neurons break up into spheres of numerous p-tau+ droplets of various sizes, which marks the beginning of neuritic plaques. These droplet spheres develop in the absence of colocalized Aβ deposits but once formed become encased in diffuse Aβ with great specificity. In contrast, neurofibrillary tangles often do not colocalize with Aβ. Double-labelling for p-tau and microglia showed a lack of microglial activation or phagocytosis of p-tau+ degeneration droplets but revealed massive upregulation of ferritin in microglia suggesting presence of high levels of free iron. Perl's Prussian blue produced positive staining of microglia, droplet spheres, and Aβ plaque cores supporting the suggestion that droplet degeneration of pretangle neurons in the hippocampus and cortex represents ferroptosis, which is accompanied by the release of neuronal iron extracellularly. CONCLUSION Age-related iron accumulation and ferroptosis in the CNS likely trigger at least two endogenous mechanisms of neuroprotective iron sequestration and chelation, microglial ferritin expression and Aβ deposition, respectively, both contributing to the formation of neuritic plaques. Since neurofibrillary tangles and Aβ deposits colocalize infrequently, tangle formation likely does not involve release of neuronal iron extracellularly. In human brain, targeted deposition of Aβ occurs specifically in response to ongoing ferroptotic droplet degeneration thereby producing neuritic plaques.
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Affiliation(s)
- Wolfgang J Streit
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, USA
| | - Jonas Rotter
- Institute of Anatomy, Leipzig University, Leipzig, Germany
| | - Karsten Winter
- Institute of Anatomy, Leipzig University, Leipzig, Germany
| | - Wolf Müller
- Department of Neuropathology, Leipzig University, Leipzig, Germany
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, USA
| | - Ingo Bechmann
- Institute of Anatomy, Leipzig University, Leipzig, Germany
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22
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Miller DR, Bu AM, Gopinath A, Martinez LR, Khoshbouei H. Methamphetamine dysregulation of the central nervous system and peripheral immunity. J Pharmacol Exp Ther 2021; 379:372-385. [PMID: 34535563 DOI: 10.1124/jpet.121.000767] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 09/16/2021] [Indexed: 11/22/2022] Open
Abstract
Methamphetamine (METH) is a potent psychostimulant that increases extracellular monoamines such as dopamine and norepinephrine and affects multiple tissue and cell types. The reinforcing properties of METH underlie its significant abuse potential and dysregulation of peripheral immunity and central nervous system functions. Together, the constellation of METH's effects on cellular targets and regulatory processes have shown to lead to immune suppression and neurodegeneration in METH addicts and animal models of METH exposure. Here we extensively review many of the cell types and mechanisms of METH-induced dysregulation of the central nervous system and peripheral immune system. Significance Statement Emerging research has begun to show that methamphetamine not only regulates dopaminergic neuronal activity, it also affects non-neuronal brain cells, such as microglia and astrocytes as well immunological cells of the periphery. The bi-directional communication between dopaminergic neurons in the CNS and peripheral immune cells becomes dysregulated by a constellation of dysfunctional neuronal and cell types revealing multiple targets that must be considered at the interface between basic and clinical neuroscience.
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Affiliation(s)
| | | | - Adithya Gopinath
- Department of Neuroscience, University of Florida, United States
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23
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Dagra A, Miller DR, Lin M, Gopinath A, Shaerzadeh F, Harris S, Sorrentino ZA, Støier JF, Velasco S, Azar J, Alonge AR, Lebowitz JJ, Ulm B, Bu M, Hansen CA, Urs N, Giasson BI, Khoshbouei H. α-Synuclein-induced dysregulation of neuronal activity contributes to murine dopamine neuron vulnerability. NPJ Parkinsons Dis 2021; 7:76. [PMID: 34408150 PMCID: PMC8373893 DOI: 10.1038/s41531-021-00210-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Accepted: 07/09/2021] [Indexed: 02/07/2023] Open
Abstract
Pathophysiological damages and loss of function of dopamine neurons precede their demise and contribute to the early phases of Parkinson's disease. The presence of aberrant intracellular pathological inclusions of the protein α-synuclein within ventral midbrain dopaminergic neurons is one of the cardinal features of Parkinson's disease. We employed molecular biology, electrophysiology, and live-cell imaging to investigate how excessive α-synuclein expression alters multiple characteristics of dopaminergic neuronal dynamics and dopamine transmission in cultured dopamine neurons conditionally expressing GCaMP6f. We found that overexpression of α-synuclein in mouse (male and female) dopaminergic neurons altered neuronal firing properties, calcium dynamics, dopamine release, protein expression, and morphology. Moreover, prolonged exposure to the D2 receptor agonist, quinpirole, rescues many of the alterations induced by α-synuclein overexpression. These studies demonstrate that α-synuclein dysregulation of neuronal activity contributes to the vulnerability of dopaminergic neurons and that modulation of D2 receptor activity can ameliorate the pathophysiology. These findings provide mechanistic insights into the insidious changes in dopaminergic neuronal activity and neuronal loss that characterize Parkinson's disease progression with significant therapeutic implications.
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Affiliation(s)
- Abeer Dagra
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Douglas R. Miller
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Min Lin
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Adithya Gopinath
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Fatemeh Shaerzadeh
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Sharonda Harris
- grid.15276.370000 0004 1936 8091Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL USA
| | - Zachary A. Sorrentino
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Jonatan Fullerton Støier
- grid.5254.60000 0001 0674 042XMolecular Neuropharmacology and Genetics Laboratory, Department of Neuroscience, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Sophia Velasco
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Janelle Azar
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Adetola R. Alonge
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Joseph J. Lebowitz
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Brittany Ulm
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Mengfei Bu
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Carissa A. Hansen
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Nikhil Urs
- grid.15276.370000 0004 1936 8091Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL USA
| | - Benoit I. Giasson
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
| | - Habibeh Khoshbouei
- grid.15276.370000 0004 1936 8091Department of Neuroscience, University of Florida, Gainesville, FL USA
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24
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Gopinath A, Badov M, Francis M, Shaw G, Collins A, Miller DR, Hansen CA, Mackie P, Tansey MG, Dagra A, Madorsky I, Ramirez-Zamora A, Okun MS, Streit WJ, Khoshbouei H. Author Correction: TNFα increases tyrosine hydroxylase expression in human monocytes. NPJ Parkinsons Dis 2021; 7:68. [PMID: 34341346 PMCID: PMC8329045 DOI: 10.1038/s41531-021-00212-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Adithya Gopinath
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA.
| | - Martin Badov
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
| | - Madison Francis
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
| | - Gerry Shaw
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA.,Encor Biotechnology Inc., Gainesville, FL, USA
| | - Anthony Collins
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
| | - Douglas R Miller
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
| | - Carissa A Hansen
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
| | - Phillip Mackie
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
| | - Malú Gámez Tansey
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
| | - Abeer Dagra
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
| | | | | | - Michael S Okun
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA.,Department of Neurology, University of Florida, Gainesville, FL, USA
| | - Wolfgang J Streit
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida, Center for Translational Research in Neurodegenerative Disease, Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
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25
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Hiller H, Beachy DE, Lebowitz JJ, Engler S, Mason JR, Miller DR, Kusmarteva I, Jacobsen LM, Posgai AL, Khoshbouei H, Oram RA, Schatz DA, Hattersley AT, Bodenmiller B, Atkinson MA, Nick HS, Wasserfall CH. Monogenic Diabetes and Integrated Stress Response Genes Display Altered Gene Expression in Type 1 Diabetes. Diabetes 2021; 70:1885-1897. [PMID: 34035041 PMCID: PMC8385619 DOI: 10.2337/db21-0070] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 05/16/2021] [Indexed: 11/13/2022]
Abstract
Type 1 diabetes (T1D) has a multifactorial autoimmune etiology, involving environmental prompts and polygenic predisposition. We hypothesized that pancreata from individuals with and at risk for T1D would exhibit dysregulated expression of genes associated with monogenic forms of diabetes caused by nonredundant single-gene mutations. Using a "monogenetic transcriptomic strategy," we measured the expression of these genes in human T1D, autoantibody-positive (autoantibody+), and control pancreas tissues with real-time quantitative PCR in accordance with the Minimum Information for Publication of Quantitative Real-Time PCR Experiments (MIQE) guidelines. Gene and protein expression was visualized in situ with use of immunofluorescence, RNAscope, and confocal microscopy. Two dozen monogenic diabetes genes showed altered expression in human pancreata from individuals with T1D versus unaffected control subjects. Six of these genes also saw dysregulation in pancreata from autoantibody+ individuals at increased risk for T1D. As a subset of these genes are related to cellular stress responses, we measured integrated stress response (ISR) genes and identified 20 with altered expression in T1D pancreata, including three of the four eIF2α-dependent kinases. Equally intriguing, we observed significant repression of the three arms of the ISR in autoantibody+ pancreata. Collectively, these efforts suggest monogenic diabetes and ISR genes are dysregulated early in the T1D disease process and likely contribute to the disorder's pathogenesis.
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Affiliation(s)
- Helmut Hiller
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL
| | - Dawn E Beachy
- Department of Neuroscience, University of Florida, Gainesville, FL
| | | | - Stefanie Engler
- Department of Quantitative Biomedicine, University of Zurich, Zurich, Switzerland
| | - Justin R Mason
- Department of Occupational Therapy, University of Florida, Gainesville, FL
| | - Douglas R Miller
- Department of Neuroscience, University of Florida, Gainesville, FL
| | - Irina Kusmarteva
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL
| | - Laura M Jacobsen
- Department of Pediatrics, University of Florida, Gainesville, FL
| | - Amanda L Posgai
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL
| | | | - Richard A Oram
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, U.K
| | - Desmond A Schatz
- Department of Pediatrics, University of Florida, Gainesville, FL
| | - Andrew T Hattersley
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, U.K
| | | | - Mark A Atkinson
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL
| | - Harry S Nick
- Department of Neuroscience, University of Florida, Gainesville, FL
- Department of Pediatrics, University of Florida, Gainesville, FL
| | - Clive H Wasserfall
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL
- Department of Pediatrics, University of Florida, Gainesville, FL
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26
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Miller DR, Guenther DT, Maurer AP, Hansen CA, Zalesky A, Khoshbouei H. Dopamine Transporter Is a Master Regulator of Dopaminergic Neural Network Connectivity. J Neurosci 2021; 41:5453-5470. [PMID: 33980544 PMCID: PMC8221606 DOI: 10.1523/jneurosci.0223-21.2021] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 04/19/2021] [Accepted: 05/01/2021] [Indexed: 12/13/2022] Open
Abstract
Dopaminergic neurons of the substantia nigra pars compacta (SNC) and ventral tegmental area (VTA) exhibit spontaneous firing activity. The dopaminergic neurons in these regions have been shown to exhibit differential sensitivity to neuronal loss and psychostimulants targeting dopamine transporter. However, it remains unclear whether these regional differences scale beyond individual neuronal activity to regional neuronal networks. Here, we used live-cell calcium imaging to show that network connectivity greatly differs between SNC and VTA regions with higher incidence of hub-like neurons in the VTA. Specifically, the frequency of hub-like neurons was significantly lower in SNC than in the adjacent VTA, consistent with the interpretation of a lower network resilience to SNC neuronal loss. We tested this hypothesis, in DAT-cre/loxP-GCaMP6f mice of either sex, when activity of an individual dopaminergic neuron is suppressed, through whole-cell patch clamp electrophysiology, in either SNC or VTA networks. Neuronal loss in the SNC increased network clustering, whereas the larger number of hub-neurons in the VTA overcompensated by decreasing network clustering in the VTA. We further show that network properties are regulatable via a dopamine transporter but not a D2 receptor dependent mechanism. Our results demonstrate novel regulatory mechanisms of functional network topology in dopaminergic brain regions.SIGNIFICANCE STATEMENT In this work, we begin to untangle the differences in complex network properties between the substantia nigra pars compacta (SNC) and VTA, that may underlie differential sensitivity between regions. The methods and analysis employed provide a springboard for investigations of network topology in multiple deep brain structures and disorders.
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Affiliation(s)
- Douglas R Miller
- Department of Neuroscience, University of Florida, Gainesville, Florida
| | - Dylan T Guenther
- Department of Neuroscience, University of Florida, Gainesville, Florida
| | - Andrew P Maurer
- Department of Neuroscience, University of Florida, Gainesville, Florida
| | - Carissa A Hansen
- Department of Neuroscience, University of Florida, Gainesville, Florida
| | - Andrew Zalesky
- Melbourne Neuropsychiatry Centre, The University of Melbourne and Melbourne Health, Melbourne, Victoria 3010, Australia
- Department of Biomedical Engineering, Melbourne School of Engineering, The University of Melbourne, Melbourne, Victoria 3010, Australia
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27
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Lin M, Mackie PM, Shaerzadeh F, Gamble-George J, Miller DR, Martyniuk CJ, Khoshbouei H. In Parkinson's patient-derived dopamine neurons, the triplication of α-synuclein locus induces distinctive firing pattern by impeding D2 receptor autoinhibition. Acta Neuropathol Commun 2021; 9:107. [PMID: 34099060 PMCID: PMC8185945 DOI: 10.1186/s40478-021-01203-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 05/17/2021] [Indexed: 12/12/2022] Open
Abstract
Pathophysiological changes in dopamine neurons precede their demise and contribute to the early phases of Parkinson's disease (PD). Intracellular pathological inclusions of the protein α-synuclein within dopaminergic neurons are a cardinal feature of PD, but the mechanisms by which α-synuclein contributes to dopaminergic neuron vulnerability remain unknown. The inaccessibility to diseased tissue has been a limitation in studying progression of pathophysiology prior to degeneration of dopamine neurons. To address these issues, we differentiated induced pluripotent stem cells (iPSCs) from a PD patient carrying the α-synuclein triplication mutation (AST) and an unaffected first-degree relative (NAS) into dopaminergic neurons. In human-like dopamine neurons α-synuclein overexpression reduced the functional availability of D2 receptors, resulting in a stark dysregulation in firing activity, dopamine release, and neuronal morphology. We back-translated these findings into primary mouse neurons overexpressing α-synuclein and found a similar phenotype, supporting the causal role for α-synuclein. Importantly, application of D2 receptor agonist, quinpirole, restored the altered firing activity of AST-derived dopaminergic neurons to normal levels. These results provide novel insights into the pre-degenerative pathophysiological neuro-phenotype induced by α-synuclein overexpression and introduce a potential mechanism for the long-established clinical efficacy of D2 receptor agonists in the treatment of PD.
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Affiliation(s)
- Min Lin
- Department of Neuroscience, University of Florida, Gainesville, FL, 32611, USA
| | - Phillip M Mackie
- Department of Neuroscience, University of Florida, Gainesville, FL, 32611, USA
| | - Fatima Shaerzadeh
- Department of Neuroscience, University of Florida, Gainesville, FL, 32611, USA
| | | | - Douglas R Miller
- Department of Neuroscience, University of Florida, Gainesville, FL, 32611, USA
| | - Chris J Martyniuk
- Environmental and Human Toxicology, University of Florida Genetics Institute, Interdisciplinary Program in Biomedical Sciences Neuroscience, College of Veterinary Medicine, University of Florida, Gainesville, FL, 32611, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida, Gainesville, FL, 32611, USA.
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Mackie P, Gopinath A, Montas D, Nielsen A, Badov M, Riklan J, Hashimi B, McNamee J, Nolan R, Runner K, Doty A, Ramirez‐Zamora A, Gaskill P, Streit W, Okun M, Khoshbouei H. Biology of the dopamine transporter on human macrophages. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.03180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | - Rachel Nolan
- PharmacologyDrexel University College of MedicinePhiladelphiaPA
| | - Kaitlyn Runner
- PharmacologyDrexel University College of MedicinePhiladelphiaPA
| | | | | | - Peter Gaskill
- PharmacologyDrexel University College of MedicinePhiladelphiaPA
| | - Wolfgang Streit
- NeuroscienceUniversity of FloridaGainesvilleFL
- University of FloridaGainesvilleFL
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Pino JA, Nuñez-Vivanco G, Hidalgo G, Reyes Parada M, Khoshbouei H, Torres GE. Identification of Critical Residues in the Carboxy Terminus of the Dopamine Transporter Involved in the G Protein βγ-Induced Dopamine Efflux. Front Pharmacol 2021; 12:642881. [PMID: 33841159 PMCID: PMC8025876 DOI: 10.3389/fphar.2021.642881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 02/11/2021] [Indexed: 11/13/2022] Open
Abstract
The dopamine transporter (DAT) plays a crucial role in the regulation of brain dopamine (DA) homeostasis through the re-uptake of DA back into the presynaptic terminal. In addition to re-uptake, DAT is also able to release DA through a process referred to as DAT-mediated DA efflux. This is the mechanism by which potent and highly addictive psychostimulants, such as amphetamine (AMPH) and its analogues, increase extracellular DA levels in motivational and reward areas of the brain. Recently, we discovered that G protein βγ subunits (Gβγ) binds to the DAT, and that activation of Gβγ results in DAT-mediated efflux - a similar mechanism as AMPH. Previously, we have shown that Gβγ binds directly to a stretch of 15 residues within the intracellular carboxy terminus of DAT (residues 582-596). Additionally, a TAT peptide containing residues 582 to 596 of DAT was able to block the Gβγ-induced DA efflux through DAT. Here, we use a combination of computational biology, mutagenesis, biochemical, and functional assays to identify the amino acid residues within the 582-596 sequence of the DAT carboxy terminus involved in the DAT-Gβγ interaction and Gβγ-induced DA efflux. Our in-silico protein-protein docking analysis predicted the importance of F587 and R588 residues in a network of interactions with residues in Gβγ. In addition, we observed that mutating R588 to alanine residue resulted in a mutant DAT which exhibited attenuated DA efflux induced by Gβγ activation. We demonstrate that R588, and to a lesser extent F5837, located within the carboxy terminus of DAT play a critical role in the DAT-Gβγ physical interaction and promotion of DA efflux. These results identify a potential new pharmacological target for the treatment of neuropsychiatric conditions in which DAT functionality is implicated including ADHD and substance use disorder.
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Affiliation(s)
- José A Pino
- Departamento de Medicina, Facultad de Medicina, Universidad de Atacama, Copiapó, Chile
| | - Gabriel Nuñez-Vivanco
- Centro de Bioinformática, Simulación y Modelado, Facultad de Ingeniería, Universidad de Talca, Talca, Chile
| | - Gabriela Hidalgo
- Department of Pharmacology and Therapeutics, University of Florida College of Medicine, Gainesville, FL, United States
| | - Miguel Reyes Parada
- Centro de Investigación Biomédica y Aplicada (CIBAP), Escuela de Medicina, Facultad de Ciencias Médicas, Universidad de Santiago de Chile, Santiago, Chile.,Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Talca, Chile
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL, United States
| | - Gonzalo E Torres
- Department of Molecular, Cellular and Biomedical Sciences, CUNY School of Medicine at City College of New York, New York, NY, United States
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Abstract
Microglia constitute the brain's immune system and their involvement in Alzheimer's disease has been discussed. Commonly, and in line with the amyloid/neuroinflammation cascade hypothesis, microglia have been portrayed as potentially dangerous immune effector cells thought to be overactivated by amyloid and producing neurotoxic inflammatory mediators that lead to neurofibrillary degeneration. We disagree with this theory and offer as an alternative the microglial dysfunction theory stating that microglia become impaired in their normally neuroprotective roles because of aging, i.e., they become senescent and aging neurons degenerate because they lack the needed microglial support for their survival. Thus, while the amyloid cascade theory relies primarily on genetic data, the dysfunction theory incorporates aging as a critical etiological factor. Aging is the greatest risk factor for the sporadic (late-onset) and most common form of Alzheimer's disease, where fully penetrant genetic mutations are absent. In this review, we lay out and discuss the human evidence that supports senescent microglial dysfunction and conflicts with the amyloid/neuroinflammation idea.
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Affiliation(s)
- Wolfgang J Streit
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | | | - Ingo Bechmann
- Anatomical Institute, University of Leipzig, Leipzig, Germany
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Miller DR, Khoshbouei H, Garai S, Cantwell LN, Stokes C, Thakur G, Papke RL. Allosterically Potentiated α7 Nicotinic Acetylcholine Receptors: Reduced Calcium Permeability and Current-Independent Control of Intracellular Calcium. Mol Pharmacol 2020; 98:695-709. [PMID: 33020143 DOI: 10.1124/molpharm.120.000012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 09/10/2020] [Indexed: 11/22/2022] Open
Abstract
The currents of α7 nicotinic acetylcholine receptors activated by acetylcholine (ACh) are brief. The channel has high permeability to calcium relative to monovalent cations and shows inward rectification. It has been previously noted that in the presence of positive allosteric modulators (PAMs), currents through the channels of α7 receptors differ from normal α7 currents both in sensitivity to specific channel blockers and their current-voltage (I-V) relationships, no longer showing inward rectification. Linear I-V functions are often associated with channels lacking calcium permeability, so we measured the I-V functions of α7 receptors activated by ACh when PAMs were bound to the allosteric binding site in the transmembrane domain. Currents were recorded in chloride-free Ringer's solution with low or high concentrations of extracellular calcium to determine the magnitude of the reversal potential shift in the two conditions as well as the I-V relationships. ACh-evoked currents potentiated by the allosteric agonist-PAMs (ago-PAMs) (3aR,4S,9bS)-4-(4-bromophenyl)-3a,4,5,9b-tetrahydro-3H-cyclopenta[c]quinoline-8-sulfonamide (GAT107) and 3-(3,4-difluorophenyl)-N-(1-(6-(4-(pyridin-2-yl)piperazin-1-yl)pyrazin-2-yl)ethyl)propenamide (B-973B) showed reduced inward rectification and calcium-dependent reversal potential shifts decreased by 80%, and 50%, respectively, compared with currents activated by ACh alone, indicative of reduced calcium permeability. Currents potentiated by 3a,4,5,9b-tetrahydro-4-(1-naphthalenyl)-3H-cyclopentan[c]quinoline-8-sulfonamide were also linear and showed no calcium-dependent reversal potential shifts. The ago-PAMs GAT-107 and B-973B stimulated increases in intracellular calcium in stably transfected HEK293 cells. However, these calcium signals were delayed relative to channel activation produced by these agents and were insensitive to the channel blocker mecamylamine. Our results indicate that, although allosterically activated α7 nicotinic ACh receptor may affect intracellular calcium levels, such effects are not likely due to large channel-dependent calcium influx. SIGNIFICANCE STATEMENT: Positive allosteric modulators (PAMs) of α7 nicotinic acetylcholine receptor can increase channel activation by two or more orders of magnitude, raising the concern that, due to the relatively high calcium permeability of α7 receptors activated by acetylcholine alone, such efficacious PAMs may have cytotoxic side effects. We show that PAMs alter the ion conduction pathway and, in general, reduce the calcium permeability of the channels. This supports the hypothesis that α7 effects on intracellular calcium may be independent of channel-mediated calcium influx.
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Affiliation(s)
- Douglas R Miller
- Departments of Neuroscience (D.R.M., H.K.) and Pharmacology and Therapeutics (C.S., R.L.P.), University of Florida, Gainesville, Florida; and Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts (S.G., L.N.C., G.T.)
| | - Habibeh Khoshbouei
- Departments of Neuroscience (D.R.M., H.K.) and Pharmacology and Therapeutics (C.S., R.L.P.), University of Florida, Gainesville, Florida; and Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts (S.G., L.N.C., G.T.)
| | - Sumanta Garai
- Departments of Neuroscience (D.R.M., H.K.) and Pharmacology and Therapeutics (C.S., R.L.P.), University of Florida, Gainesville, Florida; and Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts (S.G., L.N.C., G.T.)
| | - Lucas N Cantwell
- Departments of Neuroscience (D.R.M., H.K.) and Pharmacology and Therapeutics (C.S., R.L.P.), University of Florida, Gainesville, Florida; and Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts (S.G., L.N.C., G.T.)
| | - Clare Stokes
- Departments of Neuroscience (D.R.M., H.K.) and Pharmacology and Therapeutics (C.S., R.L.P.), University of Florida, Gainesville, Florida; and Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts (S.G., L.N.C., G.T.)
| | - Ganesh Thakur
- Departments of Neuroscience (D.R.M., H.K.) and Pharmacology and Therapeutics (C.S., R.L.P.), University of Florida, Gainesville, Florida; and Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts (S.G., L.N.C., G.T.)
| | - Roger L Papke
- Departments of Neuroscience (D.R.M., H.K.) and Pharmacology and Therapeutics (C.S., R.L.P.), University of Florida, Gainesville, Florida; and Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, Massachusetts (S.G., L.N.C., G.T.)
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Shi P, Basrai R, Cheng A, Kalaria N, Lebowitz JJ, Khoshbouei H, Sarkisian M. Abstract 6203: HDAC6 inhibitors may enhance TTFields toxicity to glioma cells by altering primary cilia. Cancer Res 2020. [DOI: 10.1158/1538-7445.am2020-6203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Tumor Treating Fields (TTFields) is the most recent FDA-approved therapy that significantly extends overall survival of patients with glioblastoma (GBM). TTFields are high frequency alternating electric fields directed at the tumor which putatively disrupt microtubule polarity and dynamics during mitosis leading to cell death. Combining TTFields with other therapies that further destabilize or alter microtubule dynamics in GBM cells may enhance TTFields efficacy. Histone deacetylase 6 (HDAC6) is an emerging regulator of glioma cell proliferation, and distinct from other HDACs through its role in deacetylating non-histone proteins such as alpha-tubulin, and promoting disassembly of microtubule-based primary cilia, an event that normally precedes mitosis. It is unclear whether inhibiting HDAC6 could enhance TTFields toxicity of GBM cells, or whether HDAC6 inhibitors have any effect on primary cilia reported in human glioblastoma. To examine this, we treated various human and mouse glioma cell lines in vitro with selective HDAC6 inhibitors (ACY1215 or ACY738) with or without 3 days of continuous 200 kHz TTFields exposure. We analyzed subsequent glioma cell proliferation and characteristics of primary cilia. Consistent with previous reports, ACY1215 and ACY738 significantly decreased glioma proliferation, in part by disrupting the G2/M transition. Notably, we found the number of non-viable human GBM cells labeled with propidium iodide was significantly increased with ACY1215 and TTFields co-treatment compared to either treatment alone. ACY1215 and ACY738 had no effect on primary cilia length, but did increase the percentage of ciliated glioma cells. Although ACY1215 and ACY738 rapidly increased levels of cytosolic acetylated alpha-tubulin, both drugs unexpectedly decreased levels of acetylated alpha- tubulin in glioma cilia which was not attributable to loss of the axoneme microtubule backbone. This indicates that the cytoplasm and cilia respond differently to HDAC6 inhibitors. ACY738 treatment in particular also led to an increase in level of ciliary Arl13b, a GTPase important for cilia stability and signaling, an effect that was not observed in normal neural cultures of mouse glia and neurons. We also observed that primary cilia are not completely ablated by TTFields, and that the viability of GBM cells engineered to lack cilia were unaffected by ACY1215 treatment. Collectively, our data raise the possibility that HDAC6 inhibitors may enhance sensitivity to TTFields therapy in part by interfering with the microtubule status or signaling pathways associated with glioma cilia.
Citation Format: Ping Shi, Reemsha Basrai, Alice Cheng, Neil Kalaria, Joseph J. Lebowitz, Habibeh Khoshbouei, Matthew Sarkisian. HDAC6 inhibitors may enhance TTFields toxicity to glioma cells by altering primary cilia [abstract]. In: Proceedings of the Annual Meeting of the American Association for Cancer Research 2020; 2020 Apr 27-28 and Jun 22-24. Philadelphia (PA): AACR; Cancer Res 2020;80(16 Suppl):Abstract nr 6203.
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Affiliation(s)
- Ping Shi
- University of Florida, Gainesville, FL
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Shaerzadeh F, Phan L, Miller D, Dacquel M, Hachmeister W, Hansen C, Bechtle A, Tu D, Martcheva M, Foster TC, Kumar A, Streit WJ, Khoshbouei H. Microglia senescence occurs in both substantia nigra and ventral tegmental area. Glia 2020; 68:2228-2245. [PMID: 32275335 DOI: 10.1002/glia.23834] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 03/19/2020] [Accepted: 03/24/2020] [Indexed: 02/06/2023]
Abstract
During aging humans lose midbrain dopamine neurons, but not all dopamine regions exhibit vulnerability to neurodegeneration. Microglia maintain tissue homeostasis and neuronal support, but microglia become senescent and likely lose some of their functional abilities. Since aging is the greatest risk factor for Parkinson's disease, we hypothesized that aging-related changes in microglia and neurons occur in the vulnerable substantia nigra pars compacta (SNc) but not the ventral tegmental area (VTA). We conducted stereological analyses to enumerate microglia and dopaminergic neurons in the SNc and VTA of 1-, 6-, 9-, 18-, and 24-month-old C57BL/J6 mice using sections double-stained with tyrosine hydroxylase (TH) and Iba1. Both brain regions show an increase in microglia with aging, whereas numbers of TH+ cells show no significant change after 9 months of age in SNc and 6 months in VTA. Morphometric analyses reveal reduced microglial complexity and projection area while cell body size increases with aging. Contact sites between microglia and dopaminergic neurons in both regions increase with aging, suggesting increased microglial support/surveillance of dopamine neurons. To assess neurotrophin expression in dopaminergic neurons, BDNF and TH mRNA were quantified. Results show that the ratio of BDNF to TH decreases in the SNc, but not the VTA. Gait analysis indicates subtle, aging-dependent changes in gait indices. In conclusion, increases in microglial cell number, ratio of microglia to dopamine neurons, and contact sites suggest that innate biological mechanisms compensate for the aging-dependent decline in microglia morphological complexity (senescence) to ensure continued neuronal support in the SNc and VTA.
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Affiliation(s)
- Fatemeh Shaerzadeh
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Leah Phan
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Douglas Miller
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Maxwell Dacquel
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - William Hachmeister
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Carissa Hansen
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Alexandra Bechtle
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Duan Tu
- Department of Mathematics, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Maia Martcheva
- Department of Mathematics, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Thomas C Foster
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Ashok Kumar
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Wolfgang J Streit
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida, USA
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Gopinath A, Collins A, Khoshbouei H, Streit WJ. Microglia and Other Myeloid Cells in Central Nervous System Health and Disease. J Pharmacol Exp Ther 2020; 375:154-160. [PMID: 32238454 DOI: 10.1124/jpet.120.265058] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 03/27/2020] [Indexed: 01/02/2023] Open
Abstract
Mononuclear macrophages derived from the bone marrow (myeloid cells) are key cellular components of the innate immune system in different organs. In this minireview, we are focused on both brain and blood macrophages, known as microglia and monocytes, respectively. We provide a succinct summary of the cells' functions under both normal and pathologic conditions, with particular reference to common neurodegenerative disorders, such as Alzheimer and Parkinson disease. SIGNIFICANCE STATEMENT: In this minireview, we aim to summarize available literature on microglial and myeloid involvement in CNS disease, directing the reader toward relevant and translatable interpretations of myeloid cell function in CNS health and neurodegeneration.
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Affiliation(s)
- Adithya Gopinath
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida
| | - Anthony Collins
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida
| | - Wolfgang J Streit
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida
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Streit WJ, Khoshbouei H, Bechmann I. Dystrophic microglia in late-onset Alzheimer's disease. Glia 2020; 68:845-854. [PMID: 31922322 DOI: 10.1002/glia.23782] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 12/23/2019] [Accepted: 12/30/2019] [Indexed: 01/08/2023]
Abstract
Here, we summarize current understanding of functional involvement of microglial cells in the most common neurodegenerative disease to affect humans, which is sporadic or late-onset Alzheimer's disease (LOAD). Our review narrowly focuses on insights obtained from post-mortem neuropathological examinations of human brains paying particular attention to microglia as these cells have long been implicated as pivotal players in the cellular processes that lead to AD-type neurodegeneration. Although complete understanding of the roles played by microglia in AD neurodegeneration remains elusive, our studies thus far have illuminated microglial involvement in LOAD, showing that microglial dystrophy, the morphological manifestation of senescence, can be integrated with other hallmark pathological features of AD, such as intraneuronal neurofibrillary degeneration (NFD) and extracellular deposits of amyloid-beta (Aβ) protein. We have demonstrated an in situ correlation between microglial dystrophy and presence of NFD suggesting that neurodegeneration is secondary to aging-related microglial deterioration, a concept founded on the notion that proper neuronal function is dependent on presence of healthy microglia. Diseased or weakened glia are detrimental for neuronal well-being because their ability to provide neuronal support may be impaired. Our most recent work also links microglial dystrophy with Aβ deposits by showing that there is a chronic, yet futile microglial reaction to insoluble amyloid deposits. This inability of microglia to remove aggregated amyloid (a foreign body) causes microglial exhaustion and thereby exacerbates already ongoing aging-dependent microglial deterioration. An eventual total loss of functional microglia in advanced LOAD promotes widespread NFD, dementia, and brain failure.
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Affiliation(s)
- Wolfgang J Streit
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida
| | - Ingo Bechmann
- Anatomical Institute, University of Leipzig, Leipzig, Germany
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Koutzoumis DN, Vergara M, Pino J, Buddendorff J, Khoshbouei H, Mandel RJ, Torres GE. Alterations of the gut microbiota with antibiotics protects dopamine neuron loss and improve motor deficits in a pharmacological rodent model of Parkinson's disease. Exp Neurol 2019; 325:113159. [PMID: 31843492 DOI: 10.1016/j.expneurol.2019.113159] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 12/02/2019] [Accepted: 12/12/2019] [Indexed: 12/18/2022]
Abstract
Parkinson's disease (PD) is a debilitating condition resulting in motor and non-motor symptoms affecting approximately 10 million people worldwide. Currently, there are no pharmacological treatments that can cure the condition or effectively halt its progression. The focus of PD research has been primarily on the neurobiological basis and consequences of dopamine (DA) neuron degeneration given that the loss of DA neurons projecting from the substantia nigra to the dorsal striatum results in the development of cardinal PD motor symptoms. Alternatively, gastrointestinal dysfunction is well recognized in PD patients, and often occurs prior to the development of motor symptoms. The gut microbiota, which contains thousands of bacterial species, play important roles in intestinal barrier integrity and function, metabolism, immunity and brain function. Pre-clinical and clinical studies suggest an important link between alterations in the composition of the gut microbiota and psychiatric and neurological conditions, including PD. Several reports have documented gut dysbiosis and alterations in the composition of the gut microbiota in PD patients. Therefore, the goal of this study was to explore the contribution of the gut microbiota to the behavioral and neurochemical alterations in a rodent toxin model of DA depletion that reproduces the motor symptoms associated with PD. We observed that chronic treatment of adult rats with non-absorbable antibiotics ameliorates the neurotoxicity of 6-hydroxydopamine (6-OHDA) in a unilateral lesion model. Specifically, immunohistochemistry against the dopaminergic neuron marker tyrosine hydroxylase (TH) showed an attenuation of the degree of 6-OHDA-induced dopaminergic neuron loss in antibiotic treated animals compared to control animals. In addition, we observed a reduction in the expression of pro-inflammatory markers in the striatum of antibiotic-treated animals. The degree of motor dysfunction after 6-OHDA was also attenuated in antibiotic-treated animals as measured by paw-rearing measurements in the cylinder test, forepaw stepping test, and ipsilateral rotations observed in the amphetamine-induced rotation test. These results implicate the gut microbiota as a potential contributor to pathology in the development of PD. Further studies are necessary to understand the specific mechanisms involved in transducing alterations in the gut microbiota to changes in dopaminergic neuron loss and motor dysfunction.
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Affiliation(s)
- Dimitri N Koutzoumis
- Department of Pharmacology and Therapeutics, University of Florida College of Medicine, 1200 Newell Drive, Gainesville, FL 32610., United States of America
| | - Macarena Vergara
- Department of Pharmacology and Therapeutics, University of Florida College of Medicine, 1200 Newell Drive, Gainesville, FL 32610., United States of America
| | - Jose Pino
- Department of Pharmacology and Therapeutics, University of Florida College of Medicine, 1200 Newell Drive, Gainesville, FL 32610., United States of America; Department of Medicine, School of Medicine, University of Atacama, 1581 Los Carrera Ave, Copiapo, Chile
| | - Julia Buddendorff
- Department of Pharmacology and Therapeutics, University of Florida College of Medicine, 1200 Newell Drive, Gainesville, FL 32610., United States of America
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, 1149 Newell Drive, Gainesville, FL 32610, United States of America
| | - Ronald J Mandel
- Department of Neuroscience, University of Florida College of Medicine, 1149 Newell Drive, Gainesville, FL 32610, United States of America
| | - Gonzalo E Torres
- Department of Molecular, Cellular, and Biomedical Sciences, City University of New York School of Medicine at City College, 160 Convent Ave, NY, New York 10031, United States of America.
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Lebowitz JJ, Khoshbouei H. Heterogeneity of dopamine release sites in health and degeneration. Neurobiol Dis 2019; 134:104633. [PMID: 31698055 DOI: 10.1016/j.nbd.2019.104633] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 09/12/2019] [Accepted: 10/02/2019] [Indexed: 02/06/2023] Open
Abstract
Despite comprising only ~ 0.001% of all neurons in the human brain, ventral midbrain dopamine neurons exert a profound influence on human behavior and cognition. As a neuromodulator, dopamine selectively inhibits or enhances synaptic signaling to coordinate neural output for action, attention, and affect. Humans invariably lose brain dopamine during aging, and this can be exacerbated in disease states such as Parkinson's Disease. Further, it is well established in multiple disease states that cell loss is selective for a subset of highly sensitive neurons within the nigrostriatal dopamine tract. Regional differences in dopamine tone are regulated pre-synaptically, with subcircuits of projecting dopamine neurons exhibiting distinct molecular and physiological signatures. Specifically, proteins at dopamine release sites that synthesize and package cytosolic dopamine, modulate its release and reuptake, and alter neuronal excitability show regional differences that provide linkages to the observed sensitivity to neurodegeneration. The aim of this review is to outline the major components of dopamine homeostasis at neurotransmitter release sites and describe the regional differences most relevant to understanding why some, but not all, dopamine neurons exhibit heightened vulnerability to neurodegeneration.
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Affiliation(s)
- Joseph J Lebowitz
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL 32610, USA
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, FL 32610, USA.
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38
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Nickoloff E, Mackie P, Runner K, Matt S, Khoshbouei H, Gaskill P. Dopamine increases HIV entry into macrophages by increasing calcium release via an alternative signaling pathway. Brain Behav Immun 2019; 82:239-252. [PMID: 31470080 PMCID: PMC6941734 DOI: 10.1016/j.bbi.2019.08.191] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 08/22/2019] [Accepted: 08/26/2019] [Indexed: 12/19/2022] Open
Abstract
Dopaminergic dysfunction has long been connected to the development of HIV infection in the CNS. Our previous data showed that dopamine increases HIV infection in human macrophages by increasing the susceptibility of primary human macrophages to HIV entry through stimulation of both D1-like and D2-like receptors. These data suggest that, in macrophages, both dopamine receptor subtypes may act through a common signaling mechanism. To define better the mechanism(s) underlying this effect, this study examines the specific signaling processes activated by dopamine in primary human monocyte-derived macrophages (hMDM). In addition to confirming that the increase in entry is unique to dopamine, these studies show that dopamine increases HIV entry through a PKA insensitive, Ca2+ dependent pathway. Further examination demonstrated that dopamine can signal through a previously defined, non-canonical pathway in human macrophages. This pathway involves both Ca2+ release and PKC phosphorylation, and these data show that dopamine mediates both of these effects and that both were partially inhibited by the Gq/11 specific inhibitor YM-254890. Studies have shown that Gq/11 preferentially couples to the D1-like receptor D5, indicating an important role of the D1-like receptors in mediating these effects. These data indicate a role for Ca2+ flux in the HIV entry process, and suggest a distinct signaling mechanism mediating some of the effects of dopamine in macrophages. Together, the data indicate that targeting this alternative dopamine signaling pathway might provide new therapeutic options for individuals with elevated CNS dopamine suffering from NeuroHIV.
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Affiliation(s)
- E.A. Nickoloff
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102
| | - P. Mackie
- Department of Neuroscience, University of Florida, Gainesville, FL, 32611
| | - K. Runner
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102
| | - S.M. Matt
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102
| | - H. Khoshbouei
- Department of Neuroscience, University of Florida, Gainesville, FL, 32611,Department of Psychiatry, University of Florida, Gainesville, FL, 32611
| | - P.J. Gaskill
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102
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Gopinath A, Doty A, Mackie PM, Hashimi B, Francis M, Saadatpour L, Saha K, Shaw G, Ramirez-Zamora A, Okun MS, Streit WJ, Khoshbouei H. A novel approach to study markers of dopamine signaling in peripheral immune cells. J Immunol Methods 2019; 476:112686. [PMID: 31634479 DOI: 10.1016/j.jim.2019.112686] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 10/11/2019] [Accepted: 10/15/2019] [Indexed: 01/01/2023]
Abstract
Human monocytes express known markers of dopamine synthesis, storage and clearance, including dopamine transporter (DAT), tyrosine hydroxylase (TH), all subtypes of dopamine receptors and vesicular monoamine transporter 2 (VMAT2). Immunohistochemical and immunofluorescent methodologies have traditionally been employed to determine DAT and TH expression in the CNS, their detection in the blood and specifically in the peripheral monocytes has not been studied by flow cytometry. Flow cytometry assays are widely used in medicine and in basic, preclinical or clinical research to quantify physical and chemical characteristics of target cell populations. Here, we have established a highly sensitive and reproducible flow cytometry panel to detect and quantify DAT and TH expression in freshly isolated or cryopreserved human peripheral monocytes. In healthy humans (n = 41 biological replicates), we show baseline DAT and TH expressing monocytes constitute ~12% of the peripheral blood mononuclear cell (PBMC) fraction when examined in fresh isolation from whole blood. Using an identical flow cytometry panel, we found that cryopreservation of PBMCs using multiple techniques resulted in altered PBMC populations as compared to fresh isolation and relative to one another. Among these, we identified an optimum cryopreservation method for detecting TH and DAT in cryopreserved PBMCs. Our data provide a sensitive and reproducible approach to examine dopamine signaling in peripheral human immune cells. This approach can be applied to study peripheral dopamine signaling under healthy and potentially under disease conditions. The use of dopamine signaling could also be explored as a technique to monitor therapeutic interventions particularly those targeting DAT and TH in the periphery.
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Affiliation(s)
- Adithya Gopinath
- Department of Neuroscience, University of Florida College of Medicine, United States of America
| | - Andria Doty
- ICBR Flow Cytometry, University of Florida, United States of America
| | - Phillip M Mackie
- Department of Neuroscience, University of Florida College of Medicine, United States of America
| | - Basil Hashimi
- Department of Neuroscience, University of Florida College of Medicine, United States of America
| | - Madison Francis
- Department of Neuroscience, University of Florida College of Medicine, United States of America
| | - Leila Saadatpour
- Department of Neuroscience, University of Florida College of Medicine, United States of America
| | - Kaustuv Saha
- Department of Neuroscience, University of Florida College of Medicine, United States of America
| | - Gerry Shaw
- Department of Neuroscience, University of Florida College of Medicine, United States of America
| | - Adolfo Ramirez-Zamora
- Department of Neurology, Fixel Institute for Neurological Diseases, Center for Movement Disorders and Neurorestoration, University of Florida College of Medicine, United States of America
| | - Michael S Okun
- Department of Neurology, Fixel Institute for Neurological Diseases, Center for Movement Disorders and Neurorestoration, University of Florida College of Medicine, United States of America
| | - Wolfgang J Streit
- Department of Neuroscience, University of Florida College of Medicine, United States of America
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, United States of America.
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40
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Miller DR, Lebowitz JJ, Guenther DT, Refowich AJ, Hansen C, Maurer AP, Khoshbouei H. Methamphetamine regulation of activity and topology of ventral midbrain networks. PLoS One 2019; 14:e0222957. [PMID: 31536584 PMCID: PMC6752877 DOI: 10.1371/journal.pone.0222957] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 09/10/2019] [Indexed: 12/16/2022] Open
Abstract
The ventral midbrain supports a variety of functions through the heterogeneity of neurons. Dopaminergic and GABA neurons within this region are particularly susceptible targets of amphetamine-class psychostimulants such as methamphetamine. While this has been evidenced through single-neuron methods, it remains unclear whether and to what extent the local neuronal network is affected and if so, by which mechanisms. Both GABAergic and dopaminergic neurons were heavily featured within the primary ventral midbrain network model system. Using spontaneous calcium activity, our data suggest methamphetamine decreased total network output via a D2 receptor-dependent manner. Over culture duration, functional connectivity between neurons decreased significantly but was unaffected by methamphetamine. However, across culture duration, exposure to methamphetamine significantly altered changes in network assortativity. Here we have established primary ventral midbrain networks culture as a viable model system that reveals specific changes in network activity, connectivity, and topology modulation by methamphetamine. This network culture system enables control over the type and number of neurons that comprise a network and facilitates detection of emergent properties that arise from the specific organization. Thus, the multidimensional properties of methamphetamine can be unraveled, leading to a better understanding of its impact on the local network structure and function.
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Affiliation(s)
- Douglas R. Miller
- Department of Neuroscience, University of Florida, Gainesville, FL, United States of America
| | - Joseph J. Lebowitz
- Department of Neuroscience, University of Florida, Gainesville, FL, United States of America
| | - Dylan T. Guenther
- Department of Neuroscience, University of Florida, Gainesville, FL, United States of America
| | - Alexander J. Refowich
- Department of Neuroscience, University of Florida, Gainesville, FL, United States of America
| | - Carissa Hansen
- Department of Neuroscience, University of Florida, Gainesville, FL, United States of America
| | - Andrew P. Maurer
- Department of Neuroscience, University of Florida, Gainesville, FL, United States of America
- McKnight Brain Institute, University of Florida, Gainesville, FL, United States of America
- Department of Biomedical Engineering, University of Florida, Gainesville, FL, United States of America
- Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL, United States of America
- * E-mail: (APM); (HK)
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida, Gainesville, FL, United States of America
- * E-mail: (APM); (HK)
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41
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Ahmari N, Santisteban MM, Miller DR, Geis NM, Larkin R, Redler T, Denson H, Khoshbouei H, Baekey DM, Raizada MK, Zubcevic J. Elevated bone marrow sympathetic drive precedes systemic inflammation in angiotensin II hypertension. Am J Physiol Heart Circ Physiol 2019; 317:H279-H289. [PMID: 31150271 DOI: 10.1152/ajpheart.00510.2018] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Increased sympathetic nervous system activity is a hallmark of hypertension (HTN), and it is implicated in altered immune system responses in its pathophysiology. However, the precise mechanisms of neural-immune interaction in HTN remain elusive. We have previously shown an association between elevated sympathetic drive to the bone marrow (BM) and activated BM immune cells in rodent models of HTN. Moreover, microglial-dependent neuroinflammation is also seen in rodent models of HTN. However, the cause-effect relationship between central and systemic inflammatory responses and the sympathetic drive remains unknown. These observations led us to hypothesize that increase in the femoral BM sympathetic nerve activity (fSNA) initiates a cascade of events leading to increase in blood pressure (BP). Here, we investigated the temporal relationship between the BM sympathetic drive, activation of the central and peripheral immune system, and increase in BP in the events leading to established HTN. The present study demonstrates that central infusion of angiotensin II (ANG II) induces early microglial activation in the paraventricular nucleus of hypothalamus, which preceded increase in the fSNA. In turn, activation of fSNA correlated with the timing of increased production and release of CD4+.IL17+ T cells and other proinflammatory cells into circulation and elevation in BP, whereas infiltration of CD4+ cells to the paraventricular nucleus marked establishment of ANG II HTN. This study identifies cellular and molecular mechanisms involved in neural-immune interactions in early and established stages of rodent ANG II HTN. NEW & NOTEWORTHY Early microglia activation in paraventricular nucleus precedes sympathetic activation of the bone marrow. This leads to increased bone marrow immune cells and their release into circulation and an increase in blood pressure. Infiltration of CD4+ T cells into paraventricular nucleus paraventricular nucleus marks late hypertension.
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Affiliation(s)
- Niousha Ahmari
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida , Gainesville, Florida.,Department of Physiology and Functional Genomics, College of Medicine, University of Florida , Gainesville, Florida
| | - Monica M Santisteban
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida , Gainesville, Florida
| | - Douglas R Miller
- Department of Neuroscience, College of Medicine, University of Florida , Gainesville, Florida
| | - Natalie M Geis
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida , Gainesville, Florida
| | - Riley Larkin
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida , Gainesville, Florida
| | - Ty Redler
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida , Gainesville, Florida
| | - Heather Denson
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida , Gainesville, Florida
| | - Habibeh Khoshbouei
- Department of Neuroscience, College of Medicine, University of Florida , Gainesville, Florida
| | - David M Baekey
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida , Gainesville, Florida
| | - Mohan K Raizada
- Department of Physiology and Functional Genomics, College of Medicine, University of Florida , Gainesville, Florida
| | - Jasenka Zubcevic
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida , Gainesville, Florida
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42
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Lin L, Sambo D, Lebowitz J, Colon‐Perez L, Marcelo F, Khoshbouei H. Blockade of nifedipine‐sensitive Ca
2+
channels decreases manganese accumulation on the dopamine neurons. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.813.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Landon Lin
- NeuroscienceUniversity of FloridaGainesvilleFL
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Gopinath A, Mackie P, Saadatpour L, Doty A, Ramirez‐Zamora A, Streit WJ, Okun M, Khoshbouei H. Dopamine transporter is dysregulated on the peripheral immune cells of drug naïve Parkinson's Disease patients. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.501.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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44
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Lin L, Khoshbouei H. The iPSC‐derived human dopamine neurons from a healthy subject and a patient with α‐synuclein triplication reveal novel therapeutic target. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.810.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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45
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Lebowitz JJ, Pino JA, Mackie PM, Lin M, Hurst C, Divita K, Collins AT, Koutzoumis DN, Torres GE, Khoshbouei H. Clustered Kv2.1 decreases dopamine transporter activity and internalization. J Biol Chem 2019; 294:6957-6971. [PMID: 30824538 DOI: 10.1074/jbc.ra119.007441] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 02/26/2019] [Indexed: 01/16/2023] Open
Abstract
The dopamine transporter (DAT) regulates dopamine neurotransmission via reuptake of dopamine released into the extracellular space. Interactions with partner proteins alter DAT function and thereby dynamically shape dopaminergic tone important for normal brain function. However, the extent and nature of these interactions are incompletely understood. Here, we describe a novel physical and functional interaction between DAT and the voltage-gated K+ channel Kv2.1 (potassium voltage-gated channel subfamily B member 1 or KCNB1). To examine the functional consequences of this interaction, we employed a combination of immunohistochemistry, immunofluorescence live-cell microscopy, co-immunoprecipitation, and electrophysiological approaches. Consistent with previous reports, we found Kv2.1 is trafficked to membrane-bound clusters observed both in vivo and in vitro in rodent dopamine neurons. Our data provide evidence that clustered Kv2.1 channels decrease DAT's lateral mobility and inhibit its internalization, while also decreasing canonical transporter activity by altering DAT's conformational equilibrium. These results suggest that Kv2.1 clusters exert a spatially discrete homeostatic braking mechanism on DAT by inducing a relative increase in inward-facing transporters. Given recent reports of Kv2.1 dysregulation in neurological disorders, it is possible that alterations in the functional interaction between DAT and Kv2.1 affect dopamine neuron activity.
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Affiliation(s)
- Joseph J Lebowitz
- From the Departments of Neuroscience and.,T32 in Movement Disorders and Neurorestoration, Fixel Center for Neurological Diseases, UF Health, Gainesville, Florida 32610
| | - Jose A Pino
- Pharmacology and Experimental Therapeutics, College of Medicine, University of Florida, Gainesville, Florida 32610 and
| | | | - Min Lin
- From the Departments of Neuroscience and
| | | | | | | | - Dimitri N Koutzoumis
- Pharmacology and Experimental Therapeutics, College of Medicine, University of Florida, Gainesville, Florida 32610 and
| | - Gonzalo E Torres
- Pharmacology and Experimental Therapeutics, College of Medicine, University of Florida, Gainesville, Florida 32610 and
| | - Habibeh Khoshbouei
- From the Departments of Neuroscience and .,T32 in Movement Disorders and Neurorestoration, Fixel Center for Neurological Diseases, UF Health, Gainesville, Florida 32610
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46
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Shaerzadeh F, Streit WJ, Heysieattalab S, Khoshbouei H. Methamphetamine neurotoxicity, microglia, and neuroinflammation. J Neuroinflammation 2018; 15:341. [PMID: 30541633 PMCID: PMC6292109 DOI: 10.1186/s12974-018-1385-0] [Citation(s) in RCA: 87] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 11/28/2018] [Indexed: 01/07/2023] Open
Abstract
Methamphetamine (METH) is an illicit psychostimulant that is subject to abuse worldwide. While the modulatory effects of METH on dopamine neurotransmission and its neurotoxicity in the central nervous system are well studied, METH’s effects on modulating microglial neuroimmune functions and on eliciting neuroinflammation to affect dopaminergic neurotoxicity has attracted considerable attention in recent years. The current review illuminates METH-induced neurotoxicity from a neuropathological perspective by summarizing studies reporting microglial activation after METH administration in rodents. Assessing microglial reactivity in terms of the cells’ morphology and immunophenotype offers an opportunity for comprehensive and objective assessment of the severity and nature of METH-induced neuronal perturbations in the CNS and can thus contribute to a better understanding of the nature of METH toxicity. We reach the conclusion here that the intensity of microglial activation reported in the majority of animal models after METH administration is quite modest, indicating that the extent of dopaminergic neuron damage directly caused by this neurotoxicant is relatively minor. Our conclusion stands in contrast to claims of excessive and detrimental neuroinflammation believed to contribute and exacerbate METH neurotoxicity. Thus, our analysis of published studies does not support the idea that suppression of microglial activity with anti-inflammatory agents could yield beneficial effects in terms of treating addiction disorders.
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Affiliation(s)
- Fatemeh Shaerzadeh
- Department of Neuroscience, University of Florida College of Medicine and McKnight Brain Institute, JHM Health Science Center, PO Box 100244, Gainesville, FL, 32610, USA
| | - Wolfgang J Streit
- Department of Neuroscience, University of Florida College of Medicine and McKnight Brain Institute, JHM Health Science Center, PO Box 100244, Gainesville, FL, 32610, USA.
| | - Soomaayeh Heysieattalab
- Cognitive Neuroscience Division, Faculty of Education and Psychology, University of Tabriz, Tabriz, Iran
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine and McKnight Brain Institute, JHM Health Science Center, PO Box 100244, Gainesville, FL, 32610, USA
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47
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Streit WJ, Braak H, Del Tredici K, Leyh J, Lier J, Khoshbouei H, Eisenlöffel C, Müller W, Bechmann I. Microglial activation occurs late during preclinical Alzheimer's disease. Glia 2018; 66:2550-2562. [PMID: 30417428 DOI: 10.1002/glia.23510] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 07/18/2018] [Accepted: 07/18/2018] [Indexed: 01/10/2023]
Abstract
Sporadic Alzheimer's disease (AD) is marked by a lengthy preclinical phase during which patients are nonsymptomatic but show pathology in variable manifestations. Whether or not neuroinflammation occurs in such nondemented individuals is unknown. We evaluated the medial temporal lobe of 66 nondemented subjects, aged 42-93, in terms of tau pathology, Aβ deposition, and microglial activation. We show that 100% of subjects had neurofibrillary degeneration (NFD), 35% had Aβ deposits, and 8% revealed microglial activation in individuals where early amyloid formation was apparent by Congo Red staining. Amyloid-induced neuroinflammatory clusters of Iba1, CD68, and ferritin-positive microglia were evident in the immediate vicinity of aggregated Aβ. Microglia in the adjacent neuropil were nonactivated. Thus, neuroinflammation in AD represents a highly localized phagocyte reaction, essentially a foreign body response, geared toward removal of insoluble Aβ. Because clustered microglia in some amyloid plaques were dystrophic and ferritin-positive, we hypothesize that these cells were exhausted by their attempts to remove the aggregated, insoluble Aβ. Our findings show that the sequence of pathologic events in AD begins with tau pathology, followed by Aβ deposition, and then by microglial activation. Because only 8% of our subjects revealed all three hallmark pathologic features, we propose that these nondemented individuals were near the threshold of transitioning from nonsymptomatic to symptomatic disease. The onset of neuroinflammation in AD may thus represent a tipping point in AD pathogenesis. Our study suggests that the role of microglia in AD pathogenesis entails primarily the attempted removal of potentially toxic, extracellular material.
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Affiliation(s)
- Wolfgang J Streit
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida
| | - Heiko Braak
- Clinical Neuroanatomy (Department of Neurology), Center for Biomedical Research, University of Ulm, Ulm, Germany
| | - Kelly Del Tredici
- Clinical Neuroanatomy (Department of Neurology), Center for Biomedical Research, University of Ulm, Ulm, Germany
| | - Judith Leyh
- Institute of Anatomy, Leipzig University, Leipzig, Germany
| | - Julia Lier
- Institute of Anatomy, Leipzig University, Leipzig, Germany
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida College of Medicine, Gainesville, Florida
| | | | - Wolf Müller
- Department of Neuropathology, Leipzig University, Leipzig, Germany
| | - Ingo Bechmann
- Institute of Anatomy, Leipzig University, Leipzig, Germany
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48
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Salvatore MF, Nejtek VA, Khoshbouei H. Prolonged increase in ser31 tyrosine hydroxylase phosphorylation in substantia nigra following cessation of chronic methamphetamine. Neurotoxicology 2018; 67:121-128. [PMID: 29782882 PMCID: PMC6088751 DOI: 10.1016/j.neuro.2018.05.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 05/14/2018] [Accepted: 05/16/2018] [Indexed: 12/13/2022]
Abstract
Methamphetamine (MA) exposure may increase the risk of motor or cognitive impairments similar to Parkinson's disease (PD) by middle age. Although damage to nigrostriatal or mesoaccumbens dopamine (DA) neurons may occur during or early after MA exposure, overt PD-like symptoms at a younger age may not manifest due to compensatory mechanisms to maintain DA neurotransmission. One possible compensatory mechanism is increased tyrosine hydroxylase (TH) phosphorylation. In the rodent PD 6-OHDA model, nigrostriatal lesion decreases TH protein in both striatum and substantia nigra (SN). However, DA loss in the SN is significantly less than that in the striatum. An increase in ser31 TH phosphorylation in the SN may increase TH activity in response to TH loss. To determine if similar compensatory mechanisms may be engaged in young mice after MA exposure, TH expression, phosphorylation, and DA tissue content were evaluated, along with dopamine transporter expression, 21 days after cessation of MA (24 mg/kg, daily, 14 days). DA tissue content was unaffected by the MA regimen in striatum, nucleus accumbens, SN, or ventral tegmental area (VTA), despite decreased TH protein in SN and VTA. In the SN, but not striatum, ser31 phosphorylation increased over 2-fold. This suggests that increased ser31 TH phosphorylation may be an inherent compensatory mechanism to attenuate DA loss against TH loss, similar to that in an established PD model. These results also indicate the somatodendritic compartments of DA neurons are more vulnerable to TH protein loss than terminal fields following MA exposure.
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Affiliation(s)
- Michael F Salvatore
- Institute for Healthy Aging, University of North Texas Health Science Center, Fort Worth, TX, United States; Department of Pharmacology, Toxicology, and Neuroscience, Louisiana State University Health Sciences Center, Shreveport, LA, United States.
| | - Vicki A Nejtek
- Institute for Healthy Aging, University of North Texas Health Science Center, Fort Worth, TX, United States
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida, Gainesville, FL, United States; Center for Addiction Research & Education, University of Florida, Gainesville, FL, United States
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49
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Seyedaghamiri F, Heysieattalab S, Hosseinmardi N, Janahmadi M, Elahi-Mahani A, Salari F, Golpayegani M, Khoshbouei H. Hippocampal glial cells modulate morphine-induced behavioral responses. Physiol Behav 2018; 191:37-46. [DOI: 10.1016/j.physbeh.2018.04.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 04/01/2018] [Accepted: 04/02/2018] [Indexed: 11/28/2022]
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50
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Sambo DO, Lebowitz JJ, Khoshbouei H. The sigma-1 receptor as a regulator of dopamine neurotransmission: A potential therapeutic target for methamphetamine addiction. Pharmacol Ther 2018; 186:152-167. [PMID: 29360540 PMCID: PMC5962385 DOI: 10.1016/j.pharmthera.2018.01.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Methamphetamine (METH) abuse is a major public health issue around the world, yet there are currently no effective pharmacotherapies for the treatment of METH addiction. METH is a potent psychostimulant that increases extracellular dopamine levels by targeting the dopamine transporter (DAT) and alters neuronal activity in the reward centers of the brain. One promising therapeutic target for the treatment of METH addiction is the sigma-1 receptor (σ1R). The σ1R is an endoplasmic reticulum-localized chaperone protein that is activated by cellular stress, and, unique to this chaperone, its function can also be induced or inhibited by different ligands. Upon activation of this unique "chaperone receptor", the σ1R regulates a variety of cellular functions and possesses neuroprotective activity in the brain. Interestingly, a variety of σ1R ligands modulate dopamine neurotransmission and reduce the behavioral effects of METH in animal models of addictive behavior, suggesting that the σ1R may be a viable therapeutic target for the treatment of METH addiction. In this review, we provide background on METH and the σ1R as well as a literature review regarding the role of σ1Rs in modulating both dopamine neurotransmission and the effects of METH. We aim to highlight the complexities of σ1R pharmacology and function as well as the therapeutic potential of the σ1R as a target for the treatment of METH addiction.
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Affiliation(s)
- Danielle O Sambo
- University of Florida, College of Medicine, Department of Neuroscience, Gainesville, FL 32611, United States
| | - Joseph J Lebowitz
- University of Florida, College of Medicine, Department of Neuroscience, Gainesville, FL 32611, United States
| | - Habibeh Khoshbouei
- University of Florida, College of Medicine, Department of Neuroscience, Gainesville, FL 32611, United States.
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