Ichiro Sora

Tohoku University, Japan

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Publications (240)814.72 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: μ-opioid receptor knockout (MOP-KO) mice display several behavioral differences from wild-type (WT) littermates including differential responses to nociceptive stimuli. Brain structural changes have been tied to behavioral alternations noted in transgenic mice with targeting of different genes. Hence, we assess the brain structure of MOP-KO mice.
    British Journal of Pharmacology 06/2014; · 5.07 Impact Factor
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    ABSTRACT: Background: Psychological stress is associated with the aggravation of asthma symptoms. Glucocorticoids (GC), which are stress hormones released upon exposure to stress, have the potential to shift immune responses towards a predominant Th2 response by priming antigen-presenting cells to produce lower levels of IL-12 as well as reducing the development of regulatory T cells. However, the involvement of GC in psychological stress-induced exacerbations of allergic asthma has not yet been clarified. Methods: Sensitized mice were exposed to restraint stress followed by forced swimming stress, during which a GC receptor antagonist or a GC synthesis inhibitor was administered, and then antigen was inhaled. Corticosterone levels in the blood were measured in stressed and nonstressed mice. After antigen inhalation, the airway responses to aerosolized methacholine, epithelial mucus secretion and airway inflammation were evaluated, and the IL-13 contents in bronchoalveolar lavage fluid were measured. Results: The exposure to stress significantly increased corticosterone levels. Allergic airway responses and the increase of IL-13 contents evoked by antigen inhalation were significantly higher in stressed mice than in nonstressed mice. The administration of a GC receptor antagonist and a GC synthesis inhibitor during stress exposure significantly reduced the exacerbation of the airway responses and the increase of IL-13 contents in stressed mice challenged with antigen. Conclusions: These results indicate that the increased release of GC upon exposure to stress has a priming effect on the aggravation of allergic airway responses following the exposure, suggesting a pathophysiological role for the neuroendocrine axis in linking psychological stress to asthma exacerbations. © 2014 S. Karger AG, Basel.
    International Archives of Allergy and Immunology 04/2014; 163(4):297-306. · 2.25 Impact Factor
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    ABSTRACT: A promoter variant of the serotonin transporter (SERT) gene is known to affect emotional and cognitive regulation. In particular, the "short" allelic variant is implicated in the etiology of multiple neuropsychiatric disorders. Heterozygous (SERT(+/-)) and homozygous (SERT(-/-)) SERT mutant mice are valuable tools for understanding the mechanisms of altered SERT levels. Although these genetic effects are well investigated in adulthood, the developmental trajectory of altered SERT levels for behavior has not been investigated. We assessed anxiety-like and cognitive behaviors in SERT mutant mice in early adolescence and adulthood to examine the developmental consequences of reduced SERT levels. Spine density of pyramidal neurons was also measured in corticolimbic brain regions. Adult SERT(-/-) mice exhibited increased anxiety-like behavior, but these differences were not observed in early adolescent SERT(-/-) mice. Conversely, SERT(+/-) and SERT(-/-) mice did display higher spontaneous alternation during early adolescence and adulthood. SERT(+/-) and SERT(-/-) also exhibited greater neuronal spine densities in the orbitofrontal but not the medial prefrontal cortices. Adult SERT(-/-) mice also showed an increased spine density in the basolateral amygdala. Developmental alterations of the serotonergic system caused by genetic inactivation of SERT can have different influences on anxiety-like and cognitive behaviors through early adolescence into adulthood, which may be associated with changes of spine density in the prefrontal cortex and amygdala. The altered maturation of serotonergic systems may lead to specific age-related vulnerabilities to psychopathologies that develop during adolescence.
    Psychopharmacology 04/2014; · 4.06 Impact Factor
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    ABSTRACT: Activation of mu-opioid receptor (MOR) disinhibits dopaminergic neurons in the ventral tegmental area (VTA) through inhibition of γ-aminobutyric acid (GABA)ergic neurons. This mechanism is thought to play a pivotal role in mediating reward behaviors. Here, we characterised VTA-projecting enkephalinergic neurons in the anterior division of the bed nucleus of the stria terminalis (BST) and investigated their targets by examining MOR expression in the VTA. In the BST, neurons expressing preproenkephalin mRNA were exclusively GABAergic, and constituted 37.2% of the total GABAergic neurons. Using retrograde tracer injected into the VTA, 21.6% of VTA-projecting BST neurons were shown to express preproenkephalin mRNA. Enkephalinergic projections from the BST exclusively formed symmetrical synapses onto the dendrites of VTA neurons. In the VTA, 74.1% of MOR mRNA-expressing neurons were GABAergic, with the rest being glutamatergic neurons expressing type-2 vesicular glutamate transporter mRNA. However, MOR mRNA was below the detection threshold in dopaminergic neurons. By immunohistochemistry, MOR was highly expressed on the extrasynaptic membranes of dendrites in GABAergic VTA neurons, including dendrites innervated by BST-VTA projection terminals. MOR was also expressed weakly on GABAergic and glutamatergic terminals in the VTA. Given that GABAA α1 is expressed at GABAergic BST-VTA synapses on dendrites of GABAergic neurons [T. Kudo et al. (2012) J. Neurosci., 32, 18035-18046], our results collectively indicate that the BST sends dual inhibitory outputs targeting GABAergic VTA neurons; GABAergic inhibition via 'wired' transmission, and enkephalinergic inhibition via 'volume' transmission. This dual inhibitory system provides the neural substrate underlying the potent disinhibitory control over dopaminergic VTA neurons exerted by the BST.
    European Journal of Neuroscience 03/2014; · 3.75 Impact Factor
  • Psychiatry research. 12/2013;
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    ABSTRACT: Genome-wide association studies (GWAS) and gene expression analyses have revealed that single nucleotide polymorphisms (SNPs) associated with multifactorial diseases, such as schizophrenia, are significantly more likely to be associated with expression quantitative trait loci (eQTL). It was recently suggested that an immune system imbalance plays an important role in the pathogenesis of schizophrenia. Interleukin-19 is a novel cytokine that may play multiple roles in immune regulation and various diseases. We selected eight tag SNPs in the eQTL of the IL-19 gene. Seven of the SNPs are putative cis-acting SNPs. Then, we conducted a case-control study using two independent samples. The first sample comprised 567 schizophrenia patients and 710 controls, and the second sample comprised 677 schizophrenia patients and 667 controls. We identified the TGAA haplotype as being significantly associated with schizophrenia (p=0.0036 and corrected p=0.0264), although a combined analysis of the TGAA haplotype with the replication samples exhibited a nominally significant difference (p=0.022 and corrected p=0.235). These results suggest that the IL-19 gene might slightly contribute to the genetic risk of schizophrenia. Thus, further research on the association of eQTL SNPs with schizophrenia is warranted.
    Progress in Neuro-Psychopharmacology and Biological Psychiatry 12/2013; · 3.55 Impact Factor
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    ABSTRACT: The present study investigated the genetic association of the disrupted-in-schizophrenia 1 (DISC1) gene with suicide using 398 Japanese completed suicides and 511 healthy controls. The functional Ser704Cys variant of DISC1 was nominally associated with completed suicide. Enhanced evidence of association was observed in a multi-marker sliding window haplotype analysis (the lowest p=0.002). These findings warrant further studies with a larger sample size to confirm the association of DISC1 with suicide.
    Psychiatry research. 11/2013;
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    ABSTRACT: Attention deficit/hyperactivity disorder (AD/HD) is characterized by significant difficulties of inattention and/or hyperactivity and impulsiveness. Dopamine transporter (DAT) knockout (KO) mice have been suggested to constitute an animal model of AD/HD. DAT KO mice exhibit persistently and profoundly elevated extracellular dopamine levels in the striatum and nucleus accumbens. These mice display numerous behavioral alterations that model aspects of AD/HD that include hyperactivity in novel environments and impulsivity. Both hyperactivity and impulsivity can be ameliorated by treatment with methylphenidate and nisoxetine. These drugs increase extracellular dopamine and norepinephrine levels in the prefrontal cortex. It is likely that methylphenidate and nisoxetine activate the prefrontal catecholamine systems by blocking the norepinephrine transporter (NET) function, thereby helping to improve AD/HD-like behavior in DAT KO mice.
    11/2013; 33(5-6):185-9.
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    ABSTRACT: The Disrupted-in-Schizophrenia 1 (DISC1) gene plays a role in the regulation of neural development. Previous evidence from genetic association and biological studies implicates the DISC1 gene as having a role in the pathophysiology of schizophrenia. In the present study, we explored the association between DISC1 missense mutation rs821616 (Ser704Cys) single nucleotide polymorphism (SNP) and four other SNPs (rs1772702, rs1754603, rs821621, rs821624) in the related haplotype block and schizophrenia in the Japanese population. We could not find a significant association of selected SNPs with schizophrenia after correction for multiple testing. We performed a meta-analysis of the Ser704Cys variant in schizophrenia using data from the present study and five previous Japanese population studies, and found no association with schizophrenia. We also examined DISC1 immunoreactivity in postmortem prefrontal cortex specimens of schizophrenia patients compared to control samples. The immunoreactivity revealed a significant decrease of DISC1 protein expression in the schizophrenia samples after ruling out potential confounding factors. However, the Ser704Cys variant did not show effects on DISC1 immunoreactivity. These results provide evidence that this functional genetic variation of DISC1 do not underlie the pathophysiology of schizophrenia in the Japanese population.
    Neuroscience Research 09/2013; · 2.20 Impact Factor
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    ABSTRACT: Dopamine (DA) is accumulated and compartmentalized by the dopamine transporter (DAT; SLC3A6) and the vesicular monoamine transporter 2 (VMAT2; SLC18A2). These transporters work at the plasma and vesicular membranes of dopaminergic neurons, respectively, and thus regulate levels of DA in neuronal compartments that include the extravesicular cytoplasmic compartment. DA in this compartment has been hypothesized to contribute to oxidative damage that can reduce the function of dopaminergic neurons in aging brains and may contribute to reductions in dopaminergic neurochemical markers, locomotor behavior and responses to dopaminergic drugs that are found in aged animals. The studies reported here examined aged mice with heterozygous deletions of VMAT2 or of DAT, which each reduce transporter expression to about 50% of levels found in wild-type (WT) mice. Aged mice displayed reduced locomotor responses under a variety of circumstances, including in response to locomotor stimulants, as well as changes in monoamine levels and metabolites in a regionally dependent manner. Several effects of aging were more pronounced in heterozygous VMAT2 knockout (KO) mice, including aging induced reductions in locomotion and reduced locomotor responses to cocaine. By contrast, some effects of aging were reduced or not observed in heterozygous DAT KO mice. These findings support the idea that altered DAT and VMAT2 expression affect age-related changes in dopaminergic function. These effects are most likely mediated by alterations in DA compartmentalization, and might be hypothesized to be more exacerbated by other factors that affect the metabolism of cytosolic DA.
    Neuropharmacology 08/2013; · 4.11 Impact Factor
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    ABSTRACT: Methamphetamine (METH) dependence show strong familial and genetic influences in family and twin studies. METH exerts its reinforcing effects by modulating monoaminergic transmission, of which dopamine is supposed to be important. Previously, experimental animals were being used to identify mechanisms of action of METH that are related to its abuse and toxicity, and genetic mouse models have also been used to define genes that may predict risk for the development of drug addiction. We found that genetic variances of dopamine transporter, dopamine receptor, micro-opioid receptor, serotonin 1A receptor, serotonin 6 receptor, and adenosine 2A adenosine receptor could be vulnerability factors for METH dependence or psychosis in the Japanese population. Genetic analysis with a genome-wide association study (GWAS)-based approach has been successful for investigating the genetic influences of METH dependence and other complex features. Collaborative studies with JGIDA and NIDA/NIH have obtained the results that the genetic vulnerability to METH dependence contributes to other major drug addiction. The genetic studies for METH dependence might help to identify the risk of individuals and to develop treatments that take advantage of individual genetic information in the future.
    08/2013; 33(4):155-60.
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    ABSTRACT: We explored the association between the brain-derived neurotrophic factor gene with suicide using 307 Japanese completed suicides, 380 healthy controls, and data from previously published samples. The meta-analyses of the valine with methionine in codon 66 (Val66Met) single nucleotide polymorphism (SNP) showed that the Met-allele tended to be associated with attempted suicide in Asian populations, but not with the completed suicide.
    Psychiatry research. 07/2013;
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    ABSTRACT: Methamphetamine (METH) use can provoke psychotic reactions requiring immediate treatment, namely METH-induced psychosis. Although the distinction between METH-induced and primary psychosis is important for understanding their clinical courses, we do not have clear diagnostic procedure by their symptoms. Not only are there similarities between the clinical features of METH-induced psychosis and schizophrenia, but there is also epidemiological evidence of a shared genetic risk between 'METH-related' disorders and schizophrenia, which makes the differentiation of these two conditions difficult. In this study, we conducted genome-wide association studies (GWAS) targeting METH-dependent patients. The METH sample group, used in the METH-dependence GWAS, included 236 METH-dependent patients and 864 healthy controls. We also included a 'within-case' comparison between 194 METH-induced psychosis patients and 42 METH-dependent patients without psychosis in a METH-induced psychosis GWAS. To investigate the shared genetic components between METH dependence, METH-induced psychosis and schizophrenia, data from our previous schizophrenia GWAS (total N=1108) was re-analyzed. In the SNP-based analysis, none of the SNPs showed genome-wide significance in either dataset. By performing a polygenic component analysis, however, we found that a large number of 'risk' alleles for METH-induced psychosis are overrepresented in individuals with schizophrenia (Pbest=0.0090). Conversely, we did not detect enrichment either between METH dependence and METH-induced psychosis or between METH dependence and schizophrenia. The results support previous epidemiological and neurobiological evidence for a relationship between METH-induced psychosis and schizophrenia. These also suggest that the overlap between genes scored as positive in these datasets can have higher probability as susceptibility genes for psychosis.Neuropsychopharmacology accepted article preview online, 17 April 2013; doi:10.1038/npp.2013.94.
    Neuropsychopharmacology: official publication of the American College of Neuropsychopharmacology 04/2013; · 8.68 Impact Factor
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    ABSTRACT: This preliminary study was performed to test the reliability and validity of the Measurement and Treatment Research to Improve Cognition in Schizophrenia (MATRICS) Consensus Cognitive Battery (MCCB), developed by the National Institute of Mental Health MATRICS initiative, as an assessment tool in a Japanese-language version (MCCB-J). The subjects for the present study were 37 patients with schizophrenia. Each subject gave written informed consent to participate in the research. In order to examine the validity of the MCCB-J, the correlation between the MCCB-J and the Japanese-language version of the Brief Assessment of Cognition in Schizophrenia (BACS) was determined. Cronbach's alpha for the MCCB-J was 0.72. The MCCB-J composite score was significantly correlated with all subtests of the MCCB-J. There was a significant correlation between the MCCB-J and the BACS composite score. This preliminary study indicates that the MCCB-J has good psychometric properties and validity.
    Psychiatry and Clinical Neurosciences 04/2013; 67(3):182-8. · 2.04 Impact Factor
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    ABSTRACT: The vesicular monoamine transporter 2 (VMAT2) translocates monoamine neurotransmitters from the neuronal cytoplasm into synaptic vesicles. Since VMAT2-/- mice die within a few days of birth, it is difficult to analyze the detailed VMAT2 functions using these mice. In this study, we generated human VMAT2 transgenic mice that expressed VMAT2 in noradrenergic neurons with the aim to rescue the lethality of VMAT2 deletion. The expression of human VMAT2 in noradrenergic neurons extended the life of VMAT2-/- mice for up to three weeks, and these mice showed severe growth deficiency compared with VMAT2+/+ mice. These results may indicate that VMAT2 expressed in noradrenergic neurons has crucial roles in survival during the first several weeks after birth, and VMAT2 functions in other monoaminergic systems could be required for further extended survival. Although VMAT2 rescue in noradrenergic neurons did not eliminate the increased morbidity and lethality associated with VMAT2 deletion, the extension of the lifespan in VMAT2 transgenic mice will enable behavioral, pharmacological and pathophysiological studies of VMAT2 function.
    Biochemical and Biophysical Research Communications 02/2013; · 2.41 Impact Factor
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    ABSTRACT: RATIONALE: Impulsivity is a key feature of disorders that include attention-deficit/hyperactivity disorder (ADHD). The cliff avoidance reaction (CAR) assesses maladaptive impulsive rodent behavior. Dopamine transporter knockout (DAT-KO) mice display features of ADHD and are candidates in which to test other impulsive phenotypes. OBJECTIVES: Impulsivity of DAT-KO mice was assessed in the CAR paradigm. For comparison, attentional deficits were also assessed in prepulse inhibition (PPI) in which DAT-KO mice have been shown to exhibit impaired sensorimotor gating. RESULTS: DAT-KO mice exhibited a profound CAR impairment compared to wild-type (WT) mice. As expected, DAT-KO mice showed PPI deficits compared to WT mice. Furthermore, the DAT-KO mice with the most impaired CAR exhibited the most severe PPI deficits. Treatment with methylphenidate or nisoxetine ameliorated CAR impairments in DAT-KO mice. CONCLUSION: These results suggest that DAT-KO mice exhibit impulsive CAR behavior that correlates with their PPI deficits. Blockade of monoamine transporters, especially the norepinephrine transporter (NET) in the prefrontal cortex (PFC), may contribute to pharmacological improvement of impulsivity in these mice.
    Psychopharmacology 02/2013; · 4.06 Impact Factor
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    ABSTRACT: Dopamine regulates the psychomotor stimulant activities of amphetamine-like substances in the brain. The effects of dopamine are mediated through five known dopamine receptor subtypes in mammals. The functional relevance of D5 dopamine receptors in the central nervous system is not well understood. To determine the functional relevance of D5 dopamine receptors, we created D5 dopamine receptor-deficient mice and then used these mice to assess the roles of D5 dopamine receptors in the behavioral response to methamphetamine. Interestingly, D5 dopamine receptor-deficient mice displayed increased ambulation in response to methamphetamine. Furthermore, dopamine transporter threonine phosphorylation levels, which regulate amphetamine-induced dopamine release, were elevated in D5 dopamine receptor-deficient mice. The increase in methamphetamine-induced locomotor activity was eliminated by pretreatment with the dopamine transporter blocker GBR12909. Taken together, these results suggest that dopamine transporter activity and threonine phosphorylation levels are regulated by D5 dopamine receptors.
    PLoS ONE 01/2013; 8(10):e75975. · 3.73 Impact Factor
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    ABSTRACT: Opioids, such as morphine and fentanyl, are widely used as effective analgesics for the treatment of acute and chronic pain. In addition, the opioid system has a key role in the rewarding effects of morphine, ethanol, cocaine and various other drugs. Although opioid sensitivity is well known to vary widely among individual subjects, several candidate genetic polymorphisms reported so far are not sufficient for fully understanding the wide range of interindividual differences in human opioid sensitivity. By conducting a multistage genome-wide association study (GWAS) in healthy subjects, we found that genetic polymorphisms within a linkage disequilibrium block that spans 2q33.3-2q34 were strongly associated with the requirements for postoperative opioid analgesics after painful cosmetic surgery. The C allele of the best candidate single-nucleotide polymorphism (SNP), rs2952768, was associated with more analgesic requirements, and consistent results were obtained in patients who underwent abdominal surgery. In addition, carriers of the C allele in this SNP exhibited less vulnerability to severe drug dependence in patients with methamphetamine dependence, alcohol dependence, and eating disorders and a lower 'Reward Dependence' score on a personality questionnaire in healthy subjects. Furthermore, the C/C genotype of this SNP was significantly associated with the elevated expression of a neighboring gene, CREB1. These results show that SNPs in this locus are the most potent genetic factors associated with human opioid sensitivity known to date, affecting both the efficacy of opioid analgesics and liability to severe substance dependence. Our findings provide valuable information for the personalized treatment of pain and drug dependence.Molecular Psychiatry advance online publication, 27 November 2012; doi:10.1038/mp.2012.164.
    Molecular psychiatry 11/2012; · 15.05 Impact Factor
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    ABSTRACT: Dopamine transporter knockout (DAT KO) mice exhibit elevated extracellular dopamine levels in brain regions that include the striatum and the nucleus accumbens, but not the prefrontal cortex. DAT KO mice model some aspects of psychiatric disorders, including schizophrenia. Smoking is more common in patients with schizophrenia, suggesting that nicotine might ameliorate aspects of the behavioral abnormalities and/or treatment side effects seen in these individuals. We report nicotine-induced normalization of effects on locomotion and prepulse inhibition of acoustic startle (PPI) in DAT KO mice that require intact serotonin 5-HT1A systems. First, we observed that the marked hyperactivity displayed by DAT KO mice was reduced by administration of nicotine. This nicotine effect was blocked by pretreatment with the non-specific nicotinic acetylcholine (nACh) receptor antagonist mecamylamine, or the 5-HT1A antagonist WAY100635. Secondly, we examined the effects of nicotine on PPI in DAT KO mice. Treatment with nicotine significantly ameliorated the PPI deficits observed in DAT KO mice. The ameliorating action of nicotine on PPI deficits in DAT KO mice was blocked by mecamylamine, the α(7) nACh receptor antagonist methyllycaconitine or WAY100635, while the α(4)β(2) nACh receptor antagonist dihydro-β-erythroidinehydrobromide (DHβE) produced only a non-significant trend toward attenuation of nicotine effects. Finally, we observed that administration of the 5-HT1A receptor agonist 8-OH-DPAT also ameliorated the deficit in PPI observed in DAT KO mice. This amelioration was antagonized by pretreatment with WAY100635. These data support the idea that nicotine might ameliorate some of the cognitive dysfunctions found in schizophrenia in a 5-HT1A-dependent fashion. This article is part of a Special Issue entitled 'Cognitive Enhancers'.
    Neuropharmacology 07/2012; 64(1):348-56. · 4.11 Impact Factor
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    ABSTRACT: Prepulse inhibition (PPI) deficits are among the most reproducible phenotypic markers found in schizophrenic patients. We recently reported that nisoxetine, a selective norepinephrine transporter (NET) inhibitor, reversed the PPI deficits that have been identified in dopamine transporter (DAT) knockout (KO) mice. However, the mechanisms underlying nisoxetine-induced PPI recovery in DAT KO mice were unclear in previous experiments. To clarify these mechanisms, PPI was tested after microinjections of nisoxetine into the medial prefrontal cortex (mPFc) or nucleus accumbens (NAc) in wildtype (WT) and DAT KO mice. c-Fos immunohistochemistry provided an indicator of neural activation. Multiple-fluorescent-labeling procedures and the retrograde tracer fluorogold were employed to identify nisoxetine-activated neurons and circuits. Systemic nisoxetine activated the mPFc, the NAc shell, the basolateral amygdala, and the subiculum. Infusions of nisoxetine into the mPFc reversed PPI deficits in DAT KO mice, but produced no changes in WT mice, while infusion of nisoxetine into the NAc had no effect on PPI in both WT and DAT KO mice. Experiments using multiple-fluorescent labeling/fluorogold revealed that nisoxetine activates presumed glutamatergic pyramidal cells that project from the mPFc to the NAc. Activated glutamatergic projections from the mPFc to the NAc appear to have substantial roles in the ability of a NET inhibitor to normalize PPI deficits in DAT KO. Thus, this data suggest that selective NET inhibitors such as nisoxetine might improve information processing deficits in schizophrenia via regulation of cortico-subcortical neuromodulation.
    Neuropsychopharmacology: official publication of the American College of Neuropsychopharmacology 07/2012; 37(11):2522-30. · 8.68 Impact Factor

Publication Stats

5k Citations
814.72 Total Impact Points

Institutions

  • 2006–2014
    • Tohoku University
      • • Graduate School of Medicine
      • • Department of Biological Psychiatry
      • • Department of Medical Genetics
      Japan
  • 2004–2013
    • Fujita Health University
      • Department of Psychiatry
      Nagoya, Aichi, Japan
    • University Hospital Medical Information Network
      Edo, Tōkyō, Japan
    • Kurume University
      • Department of Neuropsychiatry
      Kurume, Fukuoka-ken, Japan
  • 2001–2013
    • National Institutes of Health
      • Molecular Neurobiology Research Branch
      Bethesda, MD, United States
  • 2012
    • Dokkyo Medical University
      Totigi, Tochigi, Japan
  • 2011–2012
    • Tokyo Metropolitan Institute of Medical Science
      Edo, Tōkyō, Japan
    • Meijo University
      • Graduate School of Pharmacy
      Nagoya-shi, Aichi-ken, Japan
  • 2007–2011
    • Tohoku Pharmaceutical University
      Japan
    • The University of Tokyo
      • Department of Neuroscience
      Tokyo, Tokyo-to, Japan
  • 1997–2011
    • National Institute on Drug Abuse
      • Research Branch Molecular Neurobiology
      Maryland, United States
  • 2010
    • Hiroshima International University
      • Faculty of Pharmaceutical Science
      Hirosima, Hiroshima, Japan
    • Albany State University
      • Division of Psychology
      Albany, GA, United States
    • Hokkaido University
      • Graduate School of Pharmaceutical Sciences
      Sapporo-shi, Hokkaido, Japan
  • 2009
    • Tokyo Dental College
      • Department of Dental Anesthesiology
      Edo, Tōkyō, Japan
  • 2006–2009
    • Hamamatsu University School of Medicine
      • Research Center for Child Mental Development
      Hamamatsu, Shizuoka-ken, Japan
  • 2003–2009
    • Okayama University
      • Department of Neuropsychiatry
      Okayama, Okayama, Japan
  • 2008
    • Chiba University
      • Department of Psychiatry
      Chiba-shi, Chiba-ken, Japan
    • Internet Initiative Japan
      Edo, Tōkyō, Japan
  • 2004–2006
    • Medical College of Wisconsin
      • Department of Anesthesiology
      Milwaukee, WI, United States
  • 2005
    • Osaka City University
      Ōsaka, Ōsaka, Japan
  • 1998–2004
    • Johns Hopkins University
      • • Department of Anesthesiology and Critical Care Medicine
      • • Department of Neuroscience
      Baltimore, MD, United States
  • 1994
    • The University of Arizona
      • College of Medicine
      Tucson, AZ, United States