1
|
Zierath D, Mizuno S, Barker-Haliski M. Frontline Sodium Channel-Blocking Antiseizure Medicine Use Promotes Future Onset of Drug-Resistant Chronic Seizures. Int J Mol Sci 2023; 24:4848. [PMID: 36902275 PMCID: PMC10003379 DOI: 10.3390/ijms24054848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 02/25/2023] [Accepted: 02/28/2023] [Indexed: 03/06/2023] Open
Abstract
The mechanisms of treatment-resistant epilepsy remain unclear. We have previously shown that frontline administration of therapeutic doses of lamotrigine (LTG), which preferentially inhibits the fast-inactivation state of sodium channels, during corneal kindling of mice promotes cross-resistance to several other antiseizure medicines (ASMs). However, whether this phenomenon extends to monotherapy with ASMs that stabilize the slow inactivation state of sodium channels is unknown. Therefore, this study assessed whether lacosamide (LCM) monotherapy during corneal kindling would promote future development of drug-resistant focal seizures in mice. Male CF-1 mice (n = 40/group; 18-25 g) were administered an anticonvulsant dose of LCM (4.5 mg/kg, i.p.), LTG (8.5 mg/kg, i.p.), or vehicle (0.5% methylcellulose) twice daily for two weeks during kindling. A subset of mice (n = 10/group) were euthanized one day after kindling for immunohistochemical assessment of astrogliosis, neurogenesis, and neuropathology. The dose-related antiseizure efficacy of distinct ASMs, including LTG, LCM, carbamazepine, levetiracetam, gabapentin, perampanel, valproic acid, phenobarbital, and topiramate, was then assessed in the remaining kindled mice. Neither LCM nor LTG administration prevented kindling: 29/39 vehicle-exposed mice were kindled; 33/40 LTG-exposed mice were kindled; and 31/40 LCM-exposed mice were kindled. Mice administered LCM or LTG during kindling became resistant to escalating doses of LCM, LTG, and carbamazepine. Perampanel, valproic acid, and phenobarbital were less potent in LTG- and LCM-kindled mice, whereas levetiracetam and gabapentin retained equivalent potency across groups. Notable differences in reactive gliosis and neurogenesis were also appreciated. This study indicates that early, repeated administration of sodium channel-blocking ASMs, regardless of inactivation state preference, promotes pharmacoresistant chronic seizures. Inappropriate ASM monotherapy in newly diagnosed epilepsy may thus be one driver of future drug resistance, with resistance being highly ASM class specific.
Collapse
Affiliation(s)
| | | | - Melissa Barker-Haliski
- Department of Pharmacy, School of Pharmacy, University of Washington, Seattle, WA 98195, USA
| |
Collapse
|
2
|
Chronic seizures induce sex-specific cognitive deficits with loss of presenilin 2 function. Exp Neurol 2023; 361:114321. [PMID: 36634751 DOI: 10.1016/j.expneurol.2023.114321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 10/04/2022] [Accepted: 01/06/2023] [Indexed: 01/11/2023]
Abstract
Patients with early-onset Alzheimer's disease (EOAD) are at elevated risk for seizures, including patients with presenilin 2 (PSEN2) variants. Like people with epilepsy, uncontrolled seizures may worsen cognitive function in AD. While the relationship between seizures and amyloid beta accumulation has been more thoroughly investigated, the role of other drivers of seizure susceptibility in EOAD remain relatively understudied. We therefore sought to define the impact of loss of normal PSEN2 function and chronic seizures on cognitive function in the aged brain. Male and female PSEN2 KO and age- and sex-matched wild-type (WT) mice were sham or corneal kindled beginning at 6-months-old. Kindled and sham-kindled mice were then challenged up to 6 weeks later in a battery of cognitive tests: non-habituated open field (OF), T-maze spontaneous alternation (TM), and Barnes maze (BM), followed by immunohistochemistry for markers of neuroinflammation and neuroplasticity. PSEN2 KO mice required significantly more stimulations to kindle (males: p < 0.02; females: p < 0.02) versus WT. Across a range of behavioral tests, the cognitive performance of kindled female PSEN2 KO mice was most significantly impaired versus age-matched WT females. Male BM performance was generally worsened by seizures (p = 0.038), but loss of PSEN2 function did not itself worsen cognitive performance. Conversely, kindled PSEN2 KO females made the most BM errors (p = 0.007). Chronic seizures also significantly altered expression of hippocampal neuroinflammation and neuroplasticity markers in a sex-specific manner. Chronic seizures may thus significantly worsen hippocampus-dependent cognitive deficits in aged female, but not male, PSEN2 KO mice. Our work suggests that untreated focal seizures may worsen cognitive burden with loss of normal PSEN2 function in a sex-related manner.
Collapse
|
3
|
Ottonelli I, Sharma A, Ruozi B, Tosi G, Duskey JT, Vandelli MA, Lafuente JV, Nozari A, Muresanu DF, Buzoianu AD, Tian ZR, Zhang Z, Li C, Feng L, Wiklund L, Sharma HS. Nanowired Delivery of Curcumin Attenuates Methamphetamine Neurotoxicity and Elevates Levels of Dopamine and Brain-Derived Neurotrophic Factor. ADVANCES IN NEUROBIOLOGY 2023; 32:385-416. [PMID: 37480467 DOI: 10.1007/978-3-031-32997-5_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/24/2023]
Abstract
Curcumin is a well-known antioxidant used as traditional medicine in China and India since ages to treat variety of inflammatory ailments as a food supplement. Curcumin has antitumor properties with neuroprotective effects in Alzheimer's disease. Curcumin elevates brain-derived neurotrophic factor (BDNF) and dopamine (DA) levels in the brain indicating its role in substance abuse. Methamphetamine (METH) is one of the most abused substances in the world that induces profound neurotoxicity by inducing breakdown of the blood-brain barrier (BBB), vasogenic edema and cellular injuries. However, influence of curcumin on METH-induced neurotoxicity is still not well investigated. In this investigation, METH neurotoxicity and neuroprotective effects of curcumin nanodelivery were examined in a rat model. METH (20 mg/kg, i.p.) neurotoxicity is evident 4 h after its administration exhibiting breakdown of BBB to Evans blue albumin in the cerebral cortex, hippocampus, cerebellum, thalamus and hypothalamus associated with vasogenic brain edema as seen measured using water content in all these regions. Nissl attaining exhibited profound neuronal injuries in the regions of BBB damage. Normal curcumin (50 mg/kg, i.v.) 30 min after METH administration was able to reduce BBB breakdown and brain edema partially in some of the above brain regions. However, TiO2 nanowired delivery of curcumin (25 mg/kg, i.v.) significantly attenuated brain edema, neuronal injuries and the BBB leakage in all the brain areas. BDNF level showed a significant higher level in METH-treated rats as compared to saline-treated METH group. Significantly enhanced DA levels in METH-treated rats were also observed with nanowired delivery of curcumin. Normal curcumin was able to slightly elevate DA and BDNF levels in the selected brain regions. Taken together, our observations are the first to show that nanodelivery of curcumin induces superior neuroprotection in METH neurotoxicity probable by enhancing BDNF and DA levels in the brain, not reported earlier.
Collapse
Affiliation(s)
- Ilaria Ottonelli
- Te.far.t.I, Dept of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Aruna Sharma
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Surgical Sciences, Anesthesiology & Intensive Care Med., Uppsala University Hospital, Uppsala University, Uppsala, Sweden
| | - Barbara Ruozi
- Te.far.t.I, Dept of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Giovanni Tosi
- Te.far.t.I, Dept of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Jason Thomas Duskey
- Te.far.t.I, Dept of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Maria Angela Vandelli
- Te.far.t.I, Dept of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - José Vicente Lafuente
- LaNCE, Department Neuroscience, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain
| | - Ala Nozari
- Anesthesia and Critical Care, Chobanian & Avedisian School of Medicine, Boston University, Boston, MA, USA
| | - Dafin Fior Muresanu
- "RoNeuro" Institute for Neurological Research and Diagnosis, Cluj-Napoca, Romania
- Clinical Neurosciences, University of Medicine & Pharmacy, Cluj-Napoca, Romania
| | - Anca Dana Buzoianu
- Department of Clinical Pharmacology and Toxicology, "Iuliu Hatieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Z Ryan Tian
- Dept. Chemistry & Biochemistry, University of Arkansas, Fayetteville, AR, USA
| | - Zhiqiang Zhang
- Department of Neurosurgery, Chinese Medicine Hospital of Guangdong Province; The Second Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Cong Li
- Department of Neurosurgery, Chinese Medicine Hospital of Guangdong Province; The Second Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Lianyuan Feng
- Department of Neurology, Bethune International Peace Hospital, Zhongshan Road (West), Shijiazhuang, Hebei Province, China
| | - Lars Wiklund
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Surgical Sciences, Anesthesiology & Intensive Care Med., Uppsala University Hospital, Uppsala University, Uppsala, Sweden
| | - Hari Shanker Sharma
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Surgical Sciences, Anesthesiology & Intensive Care Med., Uppsala University Hospital, Uppsala University, Uppsala, Sweden.
| |
Collapse
|
4
|
Giangrasso DM, Furlong TM, Keefe KA. Characterization of striatum-mediated behavior and neurochemistry in the DJ-1 knock-out rat model of Parkinson's disease. Neurobiol Dis 2020; 134:104673. [DOI: 10.1016/j.nbd.2019.104673] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 10/16/2019] [Accepted: 11/11/2019] [Indexed: 12/27/2022] Open
|
5
|
Penrod RD, Kumar J, Smith LN, McCalley D, Nentwig T, Hughes B, Barry G, Glover K, Taniguchi M, Cowan CW. Activity-regulated cytoskeleton-associated protein (Arc/Arg3.1) regulates anxiety- and novelty-related behaviors. GENES, BRAIN, AND BEHAVIOR 2019; 18:e12561. [PMID: 30761730 PMCID: PMC6692244 DOI: 10.1111/gbb.12561] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Revised: 01/19/2019] [Accepted: 02/12/2019] [Indexed: 02/06/2023]
Abstract
The activity-regulated cytoskeleton-associated protein (Arc, also known as Arg3.1) regulates glutamatergic synapse plasticity and has been linked to neuropsychiatric illness; however, its role in behaviors associated with mood and anxiety disorders remains unclear. We find that stress upregulates Arc expression in the adult mouse nucleus accumbens (NAc)-a brain region implicated in mood and anxiety behaviors. Global Arc knockout mice have altered AMPAR-subunit surface levels in the adult NAc, and the Arc-deficient mice show reductions in anxiety-like behavior, deficits in social novelty preference, and antidepressive-like behavior. Viral-mediated expression of Arc in the adult NAc of male, global Arc KO mice restores normal levels of anxiety-like behavior in the elevated plus maze (EPM). Consistent with this finding, viral-mediated reduction of Arc in the adult NAc reduces anxiety-like behavior in male, but not female, mice in the EPM. NAc-specific reduction of Arc also produced significant deficits in both object and social novelty preference tasks. Together our findings indicate that Arc is essential for regulating normal mood- and anxiety-related behaviors and novelty discrimination, and that Arc's function within the adult NAc contributes to these behavioral effects.
Collapse
Affiliation(s)
- Rachel D. Penrod
- Departments of Neuroscience and Psychiatry & Behavioral Sciences, Medical University of South Carolina, Charleston SC 29425
- Department of Psychiatry, Harvard Medical School, McLean Hospital, Belmont MA 02478
| | - Jaswinder Kumar
- Department of Psychiatry, Harvard Medical School, McLean Hospital, Belmont MA 02478
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas TX 75390-9070
| | - Laura N. Smith
- Department of Psychiatry, Harvard Medical School, McLean Hospital, Belmont MA 02478
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas TX 75390-9070
| | - Daniel McCalley
- Departments of Neuroscience and Psychiatry & Behavioral Sciences, Medical University of South Carolina, Charleston SC 29425
| | - Todd Nentwig
- Departments of Neuroscience and Psychiatry & Behavioral Sciences, Medical University of South Carolina, Charleston SC 29425
| | - Brandon Hughes
- Departments of Neuroscience and Psychiatry & Behavioral Sciences, Medical University of South Carolina, Charleston SC 29425
| | - Gabriella Barry
- Department of Science and Mathematics, Honors College, College of Charleston, Charleston SC 29424
| | - Kelsey Glover
- Department of Science and Mathematics, Honors College, College of Charleston, Charleston SC 29424
| | - Makoto Taniguchi
- Departments of Neuroscience and Psychiatry & Behavioral Sciences, Medical University of South Carolina, Charleston SC 29425
- Department of Psychiatry, Harvard Medical School, McLean Hospital, Belmont MA 02478
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas TX 75390-9070
| | - Christopher W. Cowan
- Departments of Neuroscience and Psychiatry & Behavioral Sciences, Medical University of South Carolina, Charleston SC 29425
- Department of Psychiatry, Harvard Medical School, McLean Hospital, Belmont MA 02478
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas TX 75390-9070
| |
Collapse
|
6
|
Barger SW. Gene regulation and genetics in neurochemistry, past to future. J Neurochem 2016; 139 Suppl 2:24-57. [PMID: 27747882 DOI: 10.1111/jnc.13629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Revised: 03/01/2016] [Accepted: 03/30/2016] [Indexed: 12/14/2022]
Abstract
Ask any neuroscientist to name the most profound discoveries in the field in the past 60 years, and at or near the top of the list will be a phenomenon or technique related to genes and their expression. Indeed, our understanding of genetics and gene regulation has ushered in whole new systems of knowledge and new empirical approaches, many of which could not have even been imagined prior to the molecular biology boon of recent decades. Neurochemistry, in the classic sense, intersects with these concepts in the manifestation of neuropeptides, obviously dependent upon the central dogma (the established rules by which DNA sequence is eventually converted into protein primary structure) not only for their conformation but also for their levels and locales of expression. But, expanding these considerations to non-peptide neurotransmitters illustrates how gene regulatory events impact neurochemistry in a much broader sense, extending beyond the neurochemicals that translate electrical signals into chemical ones in the synapse, to also include every aspect of neural development, structure, function, and pathology. From the beginning, the mutability - yet relative stability - of genes and their expression patterns were recognized as potential substrates for some of the most intriguing phenomena in neurobiology - those instances of plasticity required for learning and memory. Near-heretical speculation was offered in the idea that perhaps the very sequence of the genome was altered to encode memories. A fascinating component of the intervening progress includes evidence that the central dogma is not nearly as rigid and consistent as we once thought. And this mutability extends to the potential to manipulate that code for both experimental and clinical purposes. Astonishing progress has been made in the molecular biology of neurochemistry during the 60 years since this journal debuted. Many of the gains in conceptual understanding have been driven by methodological progress, from automated high-throughput sequencing instruments to recombinant-DNA vectors that can convey color-coded genetic modifications in the chromosomes of live adult animals. This review covers the highlights of these advances, both theoretical and technological, along with a brief window into the promising science ahead. This article is part of the 60th Anniversary special issue.
Collapse
Affiliation(s)
- Steven W Barger
- Department of Geriatrics, Department of Neurobiology and Developmental Sciences, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA. .,Geriatric Research Education and Clinical Center, Central Arkansas Veterans Healthcare System, Little Rock, Arkansas, USA.
| |
Collapse
|
7
|
Barker-Haliski M, White HS. Glutamatergic Mechanisms Associated with Seizures and Epilepsy. Cold Spring Harb Perspect Med 2015; 5:a022863. [PMID: 26101204 PMCID: PMC4526718 DOI: 10.1101/cshperspect.a022863] [Citation(s) in RCA: 236] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Epilepsy is broadly characterized by aberrant neuronal excitability. Glutamate is the predominant excitatory neurotransmitter in the adult mammalian brain; thus, much of past epilepsy research has attempted to understand the role of glutamate in seizures and epilepsy. Seizures induce elevations in extracellular glutamate, which then contribute to excitotoxic damage. Chronic seizures can alter neuronal and glial expression of glutamate receptors and uptake transporters, further contributing to epileptogenesis. Evidence points to a shared glutamate pathology for epilepsy and other central nervous system (CNS) disorders, including depression, which is often a comorbidity of epilepsy. Therapies that target glutamatergic neurotransmission are available, but many have met with difficulty because of untoward adverse effects. Better understanding of this system has generated novel therapeutic targets that directly and indirectly modulate glutamatergic signaling. Thus, future efforts to manage the epileptic patient with glutamatergic-centric treatments now hold greater potential.
Collapse
Affiliation(s)
- Melissa Barker-Haliski
- Anticonvulsant Drug Development Program, Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84108
| | - H Steve White
- Anticonvulsant Drug Development Program, Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, Utah 84108
| |
Collapse
|
8
|
Barker-Haliski ML, Friedman D, French JA, White HS. Disease Modification in Epilepsy: From Animal Models to Clinical Applications. Drugs 2015; 75:749-67. [DOI: 10.1007/s40265-015-0395-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
9
|
Robinson JD, Howard CD, Pastuzyn ED, Byers DL, Keefe KA, Garris PA. Methamphetamine-induced neurotoxicity disrupts pharmacologically evoked dopamine transients in the dorsomedial and dorsolateral striatum. Neurotox Res 2014; 26:152-67. [PMID: 24562969 PMCID: PMC4071119 DOI: 10.1007/s12640-014-9459-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Revised: 01/10/2014] [Accepted: 02/04/2014] [Indexed: 11/30/2022]
Abstract
Phasic dopamine (DA) signaling, during which burst firing by DA neurons generates short-lived elevations in extracellular DA in terminal fields called DA transients, is implicated in reinforcement learning. Disrupted phasic DA signaling is proposed to link DA depletions and cognitive-behavioral impairment in methamphetamine (METH)-induced neurotoxicity. Here, we further investigated this disruption by assessing effects of METH pretreatment on DA transients elicited by a drug cocktail of raclopride, a D2 DA receptor antagonist, and nomifensine, an inhibitor of the dopamine transporter (DAT). One advantage of this approach is that pharmacological activation provides a large, high-quality data set of transients elicited by endogenous burst firing of DA neurons for analysis of regional differences and neurotoxicity. These pharmacologically evoked DA transients were measured in the dorsomedial (DM) and dorsolateral (DL) striatum of urethane-anesthetized rats by fast-scan cyclic voltammetry. Electrically evoked DA levels were also recorded to quantify DA release and uptake, and DAT binding was determined by means of autoradiography to index DA denervation. Pharmacologically evoked DA transients in intact animals exhibited a greater amplitude and frequency and shorter duration in the DM compared to the DL striatum, despite similar pre- and post-drug assessments of DA release and uptake in both sub-regions as determined from the electrically evoked DA signals. METH pretreatment reduced transient activity. The most prominent effect of METH pretreatment on transients across striatal sub-region was decreased amplitude, which mirrored decreased DAT binding and was accompanied by decreased DA release. Overall, these results identify marked intrastriatal differences in the activity of DA transients that appear independent of presynaptic mechanisms for DA release and uptake and further support disrupted phasic DA signaling mediated by decreased DA release in rats with METH-induced neurotoxicity.
Collapse
Affiliation(s)
- John D. Robinson
- School of Biological Sciences, Illinois State University, Normal, IL, USA
| | | | - Elissa D. Pastuzyn
- Interdepartmental Program in Neuroscience, University of Utah, Salt Lake City, UT, USA
| | - Diane L. Byers
- School of Biological Sciences, Illinois State University, Normal, IL, USA
| | - Kristen A. Keefe
- Interdepartmental Program in Neuroscience, University of Utah, Salt Lake City, UT, USA
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, UT, USA
| | - Paul A. Garris
- School of Biological Sciences, Illinois State University, Normal, IL, USA
| |
Collapse
|
10
|
Changes in neural circuitry regulating response-reversal learning and Arc-mediated consolidation of learning in rats with methamphetamine-induced partial monoamine loss. Neuropsychopharmacology 2014; 39:963-72. [PMID: 24150570 PMCID: PMC3924530 DOI: 10.1038/npp.2013.296] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 10/15/2013] [Accepted: 10/18/2013] [Indexed: 11/08/2022]
Abstract
Methamphetamine (METH)-induced neurotoxicity results in long-lasting depletions of monoamines and changes in basal ganglia function. We previously reported that rats with METH-induced neurotoxicity no longer engage dorsomedial striatum during a response-reversal learning task, as their performance is insensitive to acute disruption of dorsomedial striatal function by local infusion of an N-methyl-D-aspartate receptor antagonist or an antisense oligonucleotide against the activity-regulated cytoskeleton-associated (Arc) gene. However, METH-pretreated rats perform the task as well as controls. Therefore, we hypothesized that the neural circuitry involved in the learning had changed in METH-pretreated rats. To test this hypothesis, rats were pretreated with a neurotoxic regimen of METH or with saline. After 3-5 weeks, rats were trained on the reversal-learning task and in situ hybridization for Arc was performed. A significant correlation between Arc expression and performance on the task was found in nucleus accumbens shell of METH-, but not saline-, pretreated rats. Consistent with the idea that the correlation between Arc expression in a brain region and behavioral performance implicates that brain region in the learning, infusion of an antisense oligonucleotide against Arc into the shell impaired consolidation of reversal learning in METH-, but not saline-, pretreated rats. These findings provide novel evidence suggesting that METH-induced neurotoxicity leads to a shift from dorsal to ventral striatal involvement in the reversal-learning task. Such reorganization of neural circuitry underlying learning and memory processes may contribute to impaired cognitive function in individuals with METH-induced neurotoxicity or others with striatal dopamine loss, such as patients with Parkinson's disease.
Collapse
|
11
|
Riedy MD, Keefe KA. Lack of increased immediate early gene expression in rats reinstating cocaine-seeking behavior to discrete sensory cues. PLoS One 2013; 8:e72883. [PMID: 24069163 PMCID: PMC3775778 DOI: 10.1371/journal.pone.0072883] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 07/20/2013] [Indexed: 11/19/2022] Open
Abstract
Drug-seeking behavior elicited by drug-associated cues contributes to relapse in addiction; however, whether relapse elicited by drug-associated conditioned reinforcers (CR) versus discriminative stimuli (DS) involves distinct or overlapping neuronal populations is unknown. To address this question, we developed a novel cocaine self-administration and cue-induced reinstatement paradigm that exposed the same rats to distinct cocaine-associated CR and DS. Rats were trained to self-administer cocaine in separate sessions. In one, a DS signaled cocaine availability; in the other, cocaine delivery was paired with a different CR. After extinction training and reinstatement testing, where both cues were presented in separate sessions, rats were sacrificed and processed for cellular analysis of temporal activity by fluorescent in situ hybridization (CatFISH) for activity regulated cytoskeleton-associated protein (Arc) mRNA and for radioactive in situ hybridization for Arc and zif268 mRNAs. CatFISH did not reveal significant changes in Arc mRNA expression. Similar results were obtained with radioactive in situ hybridization. We have shown that while rats reinstate drug seeking in response to temporally discrete presentations of distinct drug-associated cues, such reinstatement is not associated with increased transcriptional activation of Arc or zif268 mRNAs, suggesting that expression of these genes may not be necessary for cue-induced reinstatement of drug-seeking behavior.
Collapse
Affiliation(s)
- Matthew D. Riedy
- Department of Pharmacology and Toxicology and Program in Neuroscience, The University of Utah, Salt Lake City, Utah, United States of America
| | - Kristen A. Keefe
- Department of Pharmacology and Toxicology and Program in Neuroscience, The University of Utah, Salt Lake City, Utah, United States of America
| |
Collapse
|
12
|
Howard CD, Pastuzyn ED, Barker-Haliski ML, Garris PA, Keefe KA. Phasic-like stimulation of the medial forebrain bundle augments striatal gene expression despite methamphetamine-induced partial dopamine denervation. J Neurochem 2013; 125:555-65. [PMID: 23480199 DOI: 10.1111/jnc.12234] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Revised: 02/20/2013] [Accepted: 03/04/2013] [Indexed: 11/30/2022]
Abstract
Methamphetamine-induced partial dopamine depletions are associated with impaired basal ganglia function, including decreased preprotachykinin mRNA expression and impaired transcriptional activation of activity-regulated, cytoskeleton-associated (Arc) gene in striatum. Recent work implicates deficits in phasic dopamine signaling as a potential mechanism linking methamphetamine-induced dopamine loss to impaired basal ganglia function. This study thus sought to establish a causal link between phasic dopamine transmission and altered basal ganglia function by determining whether the deficits in striatal neuron gene expression could be restored by increasing phasic dopamine release. Three weeks after pretreatment with saline or a neurotoxic regimen of methamphetamine, rats underwent phasic- or tonic-like stimulation of ascending dopamine neurons. Striatal gene expression was examined using in situ hybridization histochemistry. Phasic-like, but not tonic-like, stimulation induced immediate-early genes Arc and zif268 in both groups, despite the partial striatal dopamine denervation in methamphetamine-pretreated rats, with the Arc expression occurring in presumed striatonigral efferent neurons. Phasic-like stimulation also restored preprotachykinin mRNA expression. These results suggest that disruption of phasic dopamine signaling likely underlies methamphetamine-induced impairments in basal ganglia function, and that restoring phasic dopamine signaling may be a viable approach to manage long-term consequences of methamphetamine-induced dopamine loss on basal ganglia functions.
Collapse
|