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Čechová B, Jurčovičová J, Petríková I, Vaculín Š, Šandera Š, Šlamberová R. Impact of altered environment and early postnatal methamphetamine exposure on serotonin levels in the rat hippocampus during adolescence. Lab Anim Res 2024; 40:1. [PMID: 38308379 PMCID: PMC10835812 DOI: 10.1186/s42826-024-00192-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 01/17/2024] [Accepted: 01/30/2024] [Indexed: 02/04/2024] Open
Abstract
BACKGROUND Methamphetamine (MA) is a highly abused psychostimulant across all age groups including pregnant women. Because developing brain is vulnerable by the action of drugs, or other noxious stimuli, the aim of our study was to examine the effect of early postnatal administration of MA alone or in combination with enriched environment (EE) and/or stress of separate housing, on the levels of serotonin (5HT) in the hippocampus of male rat pups at three stages of adolescence (postnatal day (PND) 28, 35 and 45). MA (5 mg/kg/ml) was administered subcutaneously (sc) to pups (direct administration), or via mothers' milk between PND1 and PND12 (indirect administration). Controls were exposed saline (SA). Pups were exposed to EE and/or to separation from the weaning till the end of the experiment. RESULTS On PND 28, in sc-treated series, EE significantly increased the muted 5HT in SA pups after separation and restored the pronounced inhibition of 5HT by MA. No beneficial effect of EE was present in pups exposed to combination of MA and separation. 5HT development declined over time; EE, MA and separation had different effects on 5HT relative to adolescence stage. CONCLUSIONS Present study shows that MA along with environment or housing affect 5HT levels, depending on both the age and the method of application (direct or indirect). These findings extend the knowledge on the effects of MA alone and in combination with different housing conditions on the developing brain and highlight the increased sensitivity to MA during the first few months after birth.
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Affiliation(s)
- Barbora Čechová
- Department of Physiology, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Jana Jurčovičová
- Department of Physiology, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Ivana Petríková
- Department of Physiology, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Šimon Vaculín
- Department of Physiology, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Štěpán Šandera
- Department of Physiology, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Romana Šlamberová
- Department of Physiology, Third Faculty of Medicine, Charles University, Prague, Czech Republic.
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2
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Shukla M, Vincent B. Methamphetamine abuse disturbs the dopaminergic system to impair hippocampal-based learning and memory: An overview of animal and human investigations. Neurosci Biobehav Rev 2021; 131:541-559. [PMID: 34606820 DOI: 10.1016/j.neubiorev.2021.09.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 08/09/2021] [Accepted: 09/12/2021] [Indexed: 12/12/2022]
Abstract
Diverse intellectual functions including memory are some important aspects of cognition. Dopamine is a neurotransmitter of the catecholamine family, which contributes to the experience of pleasure and/or emotional states but also plays crucial roles in learning and memory. Methamphetamine is an illegal drug, the abuse of which leads to long lasting pathological manifestations in the brain. Chronic methamphetamine-induced neurotoxicity results in an alteration of various parts of the memory systems by affecting learning processes, an effect attributed to the structural similarities of this drug with dopamine. An evolving field of research established how cognitive deficits in abusers arise and how they could possibly trigger neurodegenerative disorders. Thus, the drugs-induced tenacious neurophysiological changes of the dopamine system trigger cognitive deficits, thereby affirming the influence of this addictive drug on learning, memory and executive function in human abusers. Here we present an overview of the effects of methamphetamine abuse on cognitive functions, dopaminergic transmission and hippocampal integrity as they have been validated in animals and in humans during the past 20 years.
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Affiliation(s)
- Mayuri Shukla
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, 73170, Thailand
| | - Bruno Vincent
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, 73170, Thailand; Centre National de la Recherche Scientifique, 2 Rue Michel Ange, 75016, Paris, France.
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Ferrucci M, Biagioni F, Busceti CL, Vidoni C, Castino R, Isidoro C, Ryskalin L, Frati A, Puglisi-Allegra S, Fornai F. Inhibition of Autophagy In Vivo Extends Methamphetamine Toxicity to Mesencephalic Cell Bodies. Pharmaceuticals (Basel) 2021; 14:ph14101003. [PMID: 34681227 PMCID: PMC8538796 DOI: 10.3390/ph14101003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 09/25/2021] [Accepted: 09/27/2021] [Indexed: 01/21/2023] Open
Abstract
Methamphetamine (METH) is a widely abused psychostimulant and a stress-inducing compound, which leads to neurotoxicity for nigrostriatal dopamine (DA) terminals in rodents and primates including humans. In vitro studies indicate that autophagy is a strong modulator of METH toxicity. In detail, suppressing autophagy increases METH toxicity, while stimulating autophagy prevents METH-induced toxicity in cell cultures. In the present study, the role of autophagy was investigated in vivo. In the whole brain, METH alone destroys meso-striatal DA axon terminals, while fairly sparing DA cell bodies within substantia nigra pars compacta (SNpc). No damage to either cell bodies or axons from ventral tegmental area (VTA) is currently documented. According to the hypothesis that ongoing autophagy prevents METH-induced DA toxicity, we tested whether systemic injection of autophagy inhibitors such as asparagine (ASN, 1000 mg/Kg) or glutamine (GLN, 1000 mg/Kg), may extend METH toxicity to DA cell bodies, both within SNpc and VTA, where autophagy was found to be inhibited. When METH (5 mg/Kg × 4, 2 h apart) was administered to C57Bl/6 mice following ASN or GLN, a frank loss of cell bodies takes place within SNpc and a loss of both axons and cell bodies of VTA neurons is documented. These data indicate that, ongoing autophagy protects DA neurons and determines the refractoriness of cell bodies to METH-induced toxicity.
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Affiliation(s)
- Michela Ferrucci
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Via Roma 55, 56126 Pisa, Italy; (M.F.); (L.R.)
| | - Francesca Biagioni
- I.R.C.C.S. Neuromed, Via Atinense 18, 86077 Isernia, Italy; (F.B.); (C.L.B.); (A.F.); (S.P.-A.)
| | - Carla L. Busceti
- I.R.C.C.S. Neuromed, Via Atinense 18, 86077 Isernia, Italy; (F.B.); (C.L.B.); (A.F.); (S.P.-A.)
| | - Chiara Vidoni
- Department of Health Sciences, Università del Piemonte Orientale, Via P. Solaroli 17, 28100 Novara, Italy; (C.V.); (R.C.); (C.I.)
| | - Roberta Castino
- Department of Health Sciences, Università del Piemonte Orientale, Via P. Solaroli 17, 28100 Novara, Italy; (C.V.); (R.C.); (C.I.)
| | - Ciro Isidoro
- Department of Health Sciences, Università del Piemonte Orientale, Via P. Solaroli 17, 28100 Novara, Italy; (C.V.); (R.C.); (C.I.)
| | - Larisa Ryskalin
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Via Roma 55, 56126 Pisa, Italy; (M.F.); (L.R.)
| | - Alessandro Frati
- I.R.C.C.S. Neuromed, Via Atinense 18, 86077 Isernia, Italy; (F.B.); (C.L.B.); (A.F.); (S.P.-A.)
- Neurosurgery Division, Human Neurosciences Department, Sapienza University, 00135 Rome, Italy
| | - Stefano Puglisi-Allegra
- I.R.C.C.S. Neuromed, Via Atinense 18, 86077 Isernia, Italy; (F.B.); (C.L.B.); (A.F.); (S.P.-A.)
| | - Francesco Fornai
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Via Roma 55, 56126 Pisa, Italy; (M.F.); (L.R.)
- I.R.C.C.S. Neuromed, Via Atinense 18, 86077 Isernia, Italy; (F.B.); (C.L.B.); (A.F.); (S.P.-A.)
- Correspondence: or ; Tel.: +39-050-2218601
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Holubová-Kroupová A, Šlamberová R. Perinatal Stress and Methamphetamine Exposure Decreases Anxiety-Like Behavior in Adult Male Rats. Front Behav Neurosci 2021; 15:648780. [PMID: 33994969 PMCID: PMC8116599 DOI: 10.3389/fnbeh.2021.648780] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 03/09/2021] [Indexed: 11/13/2022] Open
Abstract
Methamphetamine (MA) is an illicit synthetic psychostimulant drug, and its abuse is growing worldwide. MA has been reported as the primary drug of choice, by drug-abusing women, during pregnancy. Since MA easily crosses the placental barrier, the fetus is exposed to MA in a similar fashion to the mother. This study aimed to evaluate the effect of long-term perinatal stressors and drug exposure on anxiety-like behavior in adult male rats using the open field test (OF) and elevated plus maze (EPM). Dams were divided into three groups according to drug treatment during pregnancy: controls (C), saline-SA [subcutaneous (s.c.), 1 ml/kg], and MA (s.c., 5 mg/kg). Litters were divided into four groups according to postnatal stressors: non-stressed controls (N), maternal separation (S), maternal cold water stress (W), and maternal separation plus maternal cold water stress (SW). Forty-five minutes before testing (in both OF and EPM), one-half of adult male rats received an (s.c.) injection of MA and the other half received an SA injection. Prenatal MA/stress exposure did not affect anxiety-like behavior in adult male rats in both tests. In the OF, an acute MA dose in adulthood increased the time spent in the central disk area, decreased time spent in the corners, and decreased time spent immobile and grooming. Also, postnatal stress increased time spent in the central disk area, decreased time spent in corners, and increased mobility compared to controls. All groups of rats exposed to postnatal stressors spent significantly less time in the closed arms of the EPM compared to controls. Overall, our results indicate that early postnatal stress and a single acute MA administration in adulthood decreases the parameters of anxiety-like behavior in adult male rats regardless of prenatal MA exposure. Moreover, postnatal stress via maternal separation impacts the effect of acute MA administration in adulthood. Long-term postnatal stress may thus result in improved adaptation to subsequent stressful experiences later in life.
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Affiliation(s)
- Anna Holubová-Kroupová
- Department of Physiology, Third Faculty of Medicine, Charles University, Prague, Czechia
| | - Romana Šlamberová
- Department of Physiology, Third Faculty of Medicine, Charles University, Prague, Czechia
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Schweppe CA, Burzynski C, Jayanthi S, Ladenheim B, Cadet JL, Gardner EL, Xi ZX, van Praag H, Newman AH, Keck TM. Neurochemical and behavioral comparisons of contingent and non-contingent methamphetamine exposure following binge or yoked long-access self-administration paradigms. Psychopharmacology (Berl) 2020; 237:1989-2005. [PMID: 32388619 PMCID: PMC7974824 DOI: 10.1007/s00213-020-05513-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 03/26/2020] [Indexed: 12/22/2022]
Abstract
RATIONALE Abuse of the psychostimulant methamphetamine (METH) can cause long-lasting damage to brain monoaminergic systems and is associated with profound mental health problems for users, including lasting cognitive impairments. Animal models of METH exposure have been useful in dissecting the molecular effects of the drug on cognition, but many studies use acute, non-contingent "binge" administrations of METH which do not adequately approximate human METH use. Long-term METH exposure via long-access (LgA) self-administration paradigms has been proposed to more closely reflect human use and induce cognitive impairments. OBJECTIVE To better understand the role of contingency and patterns of exposure in METH-induced cognitive impairments, we analyzed behavioral and neurochemical outcomes in adult male rats, comparing non-contingent "binge" METH administration with contingent (LgA) METH self-administration and non-contingent yoked partners. RESULTS Binge METH (40 mg/kg, i.p., over 1 day) dramatically altered striatal and hippocampal dopamine, DOPAC, 5-HT, 5-HIAA, BDNF, and TrkB 75 days after drug exposure. In contrast, 6-h LgA METH self-administration (cumulative 24.8-48.9 mg METH, i.v., over 16 days) altered hippocampal BDNF in both contingent and yoked animals but reduced striatal 5-HIAA in only contingent animals. Neurochemical alterations following binge METH administration were not accompanied by cognitive deficits in Morris water maze, novel object recognition, or Y-maze tests. However, contingent LgA METH self-administration resulted in impaired spatial memory in the water maze. CONCLUSIONS Overall, substantial differences in neurochemical markers between METH exposure and self-administration paradigms did not consistently translate to deficits in cognitive tasks, highlighting the complexity of correlating METH-induced neurochemical changes with cognitive outcomes.
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Affiliation(s)
- Catherine A. Schweppe
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse – Intramural Research Program, National Institutes of Health, Baltimore, 333 Cassell Drive, Baltimore, MD 21224, USA,Present address: Department of Neurology, University of California Los Angeles, 635 Charles E Young Drive South, Los Angeles, CA 90095, USA
| | - Caitlin Burzynski
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse – Intramural Research Program, National Institutes of Health, Baltimore, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Subramaniam Jayanthi
- Molecular Neuropsychiatry Research Branch, National Institute on Drug Abuse – Intramural Research Program, National Institutes of Health, Baltimore, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Bruce Ladenheim
- Molecular Neuropsychiatry Research Branch, National Institute on Drug Abuse – Intramural Research Program, National Institutes of Health, Baltimore, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Jean Lud Cadet
- Molecular Neuropsychiatry Research Branch, National Institute on Drug Abuse – Intramural Research Program, National Institutes of Health, Baltimore, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Eliot L. Gardner
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse – Intramural Research Program, National Institutes of Health, Baltimore, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Zheng-Xiong Xi
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse – Intramural Research Program, National Institutes of Health, Baltimore, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Henriette van Praag
- Neuroplasticity and Behavior Unit, Laboratory of Neurosciences, National Institute on Aging – Intramural Research Program, National Institutes of Health, Baltimore, MD 21224, USA,Department of Biomedical Science, Charles E. Schmidt College of Medicine, and Brain Institute, Florida Atlantic University, Jupiter, FL 33458, USA
| | - Amy Hauck Newman
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse – Intramural Research Program, National Institutes of Health, Baltimore, 333 Cassell Drive, Baltimore, MD 21224, USA
| | - Thomas M. Keck
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse – Intramural Research Program, National Institutes of Health, Baltimore, 333 Cassell Drive, Baltimore, MD 21224, USA,Department of Chemistry & Biochemistry, Department of Molecular & Cellular Biosciences, College of Science and Mathematics, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, USA
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6
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Chen X, Qiu F, Zhao X, Lu J, Tan X, Xu J, Chen C, Zhang F, Liu C, Qiao D, Wang H. Astrocyte-Derived Lipocalin-2 Is Involved in Mitochondrion-Related Neuronal Apoptosis Induced by Methamphetamine. ACS Chem Neurosci 2020; 11:1102-1116. [PMID: 32186847 DOI: 10.1021/acschemneuro.9b00559] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Methamphetamine (METH) is a widely abused and highly addictive psychoactive stimulant that can induce neuronal apoptosis. Lipocalin-2 (LCN2) is a member of the lipocalin family, and its upregulation is involved in cell death in the adult brain. However, the role of LCN2 in METH-induced neurotoxicity has not been reported. In this study, we found that LCN2 was predominantly expressed in hippocampal astrocytes after METH exposure and that recombinant LCN2 (Re LCN2) can induce neuronal apoptosis in vitro and in vivo. The inhibition of LCN2 and LCN2R, a cell surface receptor for LCN2, reduced METH- and Re LCN2-induced mitochondrion-related neuronal apoptosis in cultures of primary rat neurons and animal models. Our study supports the role of reactive oxygen species (ROS) generation and the PRKR-like ER kinase (PERK)-mediated signaling pathway in the upregulation of astrocyte-derived LCN2 after METH exposure. Additionally, the serum and cerebrospinal fluid (CSF) levels of LCN2 were significantly upregulated after METH exposure. These results indicate that upregulation of astrocyte-derived LCN2 binding to LCN2R is involved in METH-induced mitochondrion-related neuronal apoptosis.
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Affiliation(s)
- Xuebing Chen
- School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
| | - Feng Qiu
- Department of Laboratory Medicine, Nanhai Hospital, Southern Medical University, Foshan, Guangdong 528244, China
| | - Xu Zhao
- School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
| | - Jiancong Lu
- School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
| | - Xiaohui Tan
- School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
| | - Jingtao Xu
- School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
| | - Chuanxiang Chen
- School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
| | - Fu Zhang
- Key Lab of Forensic Pathology, Guangdong Public Security Department, Guangzhou 510050, China
| | - Chao Liu
- Guangzhou Forensic Science Institute, Guangzhou 510030, China
| | - Dongfang Qiao
- School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
| | - Huijun Wang
- School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
- Department of Laboratory Medicine, Nanhai Hospital, Southern Medical University, Foshan, Guangdong 528244, China
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Lee B, Choi GM, Shim I, Lee H. Genistein Prevents Single Prolonged Stress-Induced Cognitive Impairment in a Post-Traumatic Stress Disorder Rat Model via Activation of the Serotonergic System. J Med Food 2020; 23:476-484. [PMID: 32267780 DOI: 10.1089/jmf.2019.4519] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Post-traumatic stress disorder (PTSD) is a stress-associated mental disorder characterized by an imbalance of neurotransmitters in response to traumatic events or fear. Genistein (GEN), a natural isoflavone, has been shown to exhibit neuroprotective effects. Here, we used the Morris water maze (MWM) and object recognition task (ORT) tests to examine the effects of GEN on cognitive impairment in rats after exposure to single prolonged stress (SPS), and its interaction with the serotonergic system. After exposure to SPS, male rats received GEN (2, 4, and 10 mg/kg, i.p.) for 14 days. Daily GEN administration significantly improved cognitive function in the ORT and MWM tests. GEN treatment also inhibited SPS-induced decreases in serotonin (5-HT) levels in the medial prefrontal cortex and hippocampus. These increased 5-HT concentrations in response to GEN treatment could be partially attributed to the ratio of 5-hydroxyindoleacetic acid/5-HT in the hippocampus. Our findings suggest that GEN significantly attenuates SPS-induced memory deficits in rats and may represent an effective therapeutic option for the treatment of PTSD.
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Affiliation(s)
- Bombi Lee
- Acupuncture and Meridian Science Research Center, Kyung Hee University, Seoul, Korea.,Center for Converging Humanities, Kyung Hee University, Seoul, Korea
| | - Gwang Muk Choi
- The Graduate School of Basic Science of Medicine, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Insop Shim
- Department of Physiology, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Hyejung Lee
- Acupuncture and Meridian Science Research Center, Kyung Hee University, Seoul, Korea
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Effects of intrastriatal dopamine D1 or D2 antagonists on methamphetamine-induced egocentric and allocentric learning and memory deficits in Sprague-Dawley rats. Psychopharmacology (Berl) 2019; 236:2243-2258. [PMID: 30919007 PMCID: PMC6626678 DOI: 10.1007/s00213-019-05221-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 03/06/2019] [Indexed: 10/27/2022]
Abstract
RATIONALE Methamphetamine (MA) is an abused psychostimulant that causes cognitive deficits after chronic use. Neostriatal dopamine receptors play a role in MA monoamine neurotoxicity. Blocking dopamine receptors prior to MA exposure in adult rats attenuates monoamine reductions and reactive gliosis. OBJECTIVES We tested whether blocking dopamine receptors protects against cognitive deficits. METHODS First, we determined the effects of MA alone versus MA in combination with the dopamine receptor D1 antagonist SCH-23390 or the dopamine receptor D2 antagonist sulpiride on cFos expression and monoamines at the age when rats in the cognitive experiment were to begin testing and monoamines in rats after cognitive testing. RESULTS SCH-23390 infused into the neostriatum prior to systemic administration of MA attenuated MA-induced cFos activation while sulpiride induced cFos activation. Two weeks after MA, rats had dopamine and serotonin reductions that were attenuated by each antagonist. Other rats treated the same way, were tested for egocentric learning and memory in the Cincinnati water maze, for navigational strategy in a star water maze, and spatial learning and memory in a Morris water maze. Pre-treatment with SCH-23390 or sulpiride attenuated the effects of MA on egocentric and spatial learning and memory. MA-treated rats showed a shift from an egocentric to a disorganized strategy in the star maze that was less disorganized in groups receiving MA and an antagonist. Post-behavior monoamine reductions remained but were attenuated by the antagonists but not identically to what was seen in rats not behaviorally tested. CONCLUSIONS The results show for the first time that dopamine receptors are mediators of MA-induced cognitive deficits.
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The Neuroprotective Effect of L-Stepholidine on Methamphetamine-Induced Memory Deficits in Mice. Neurotox Res 2019; 36:376-386. [PMID: 31201732 DOI: 10.1007/s12640-019-00069-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 05/27/2019] [Accepted: 05/28/2019] [Indexed: 10/26/2022]
Abstract
Repeated methamphetamine (METH) exposure can cause severe neurotoxicity to the central nervous system, and lead to memory deficits. L-Stepholidine (L-SPD) is a structurally identified alkaloid extract of the Chinese herb Stephania intermedia, which elicits dopamine (DA) D1-type receptors partial agonistic activity and D2-type receptors antagonistic activity. In this study, we investigated the effect of L-SPD on METH-induced memory deficits in mice and its underlying mechanisms. We found that repeated exposure to METH (10 mg/kg, i.p., once per day for 7 consecutive days) impaired memory functions in the novel object recognition experiment. Pretreatment of L-SPD (10 mg/kg, i.p.) significantly improved METH-induced memory deficits in mice. Meanwhile, the protein expression of dopaminergic D2 receptors in hippocampus area was significantly increased by repeated METH exposure, while the protein expression of dopamine transporter (DAT) was significantly reduced. Additionally, the protein expression of phospho-protein kinase A (p-PKA) was significantly increased by repeated METH exposure. The hyperpolarization-activated cyclic-nucleotide-gated non-selective cation 1 (HCN1) channel, which was a key regulator of memory functions and could be regulated by p-PKA, was also significantly increased by repeated METH exposure. These changes caused by METH could be prevented by L-SPD pretreatment. Therefore, our data firstly showed that pretreatment of L-SPD exhibited the protective effect against METH-induced memory deficits, possibly through reducing METH-induced upregulation of dopaminergic pathway and HCN1 channels.
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10
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A Single High Dose of Methamphetamine Reduces Monoamines and Impairs Egocentric and Allocentric Learning and Memory in Adult Male Rats. Neurotox Res 2018; 33:671-680. [PMID: 29427284 DOI: 10.1007/s12640-018-9871-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 12/29/2017] [Accepted: 01/16/2018] [Indexed: 10/18/2022]
Abstract
Methamphetamine (MA) alters dopamine markers and cognitive function in heavy users. In rodents, there are MA dosing regimens that induce concordant effects using repeated administration at spaced intervals. These regimens are effective but complicate experiments designed to disentangle the effects of the drug on different brain regions in relation to their cognitive effects because of treatment spacing. In an effort to simplify the model, we tested whether a single dose of MA could induce the same monoamine and cognitive effects as multiple, spaced dosing without affecting survival. Adult male Sprague-Dawley rats were treated with 40 mg/kg MA subcutaneously once and tested starting 2 weeks later. MA-treated rats showed deficits in egocentric navigation in Cincinnati water maze, in spatial navigation in the Morris water maze, and in choosing a consistent problem-solving strategy in the Star water maze when given the option to show a preference. MA-treated rats had persistent dopamine and serotonin reductions in the neostriatum and nucleus accumbens, and serotonin reductions in the hippocampus of the same magnitude as in repetitive treatment models. The data demonstrate that a single dose recapitulates the neurocognitive and monoamine effects of multiple-dose regimens, thereby simplifying the model of MA-induced neurotoxicity.
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Moszczynska A, Callan SP. Molecular, Behavioral, and Physiological Consequences of Methamphetamine Neurotoxicity: Implications for Treatment. J Pharmacol Exp Ther 2017; 362:474-488. [PMID: 28630283 PMCID: PMC11047030 DOI: 10.1124/jpet.116.238501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Accepted: 05/09/2017] [Indexed: 04/28/2024] Open
Abstract
Understanding the relationship between the molecular mechanisms underlying neurotoxicity of high-dose methamphetamine (METH) and related clinical manifestations is imperative for providing more effective treatments for human METH users. This article provides an overview of clinical manifestations of METH neurotoxicity to the central nervous system and neurobiology underlying the consequences of administration of neurotoxic METH doses, and discusses implications of METH neurotoxicity for treatment of human abusers of the drug.
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Affiliation(s)
- Anna Moszczynska
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan
| | - Sean Patrick Callan
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan
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