Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

Halogenated ethers, such as desflurane, sevoflurane, and isoflurane, are known to exert an array of effects besides sedation. However, the postanesthetic effects of desflurane remain undiscovered as no study has explored these effects systematically. Phenotypic screening using behavioral test batteries is a powerful method to identify such effects. In the present study, we behaviorally phenotyped desflurane-treated mice to investigate postanesthetic effects. We applied comprehensive behavioral test batteries measuring sensorimotor functions, anxiety, depression, sociability, attention, and learning abilities, starting 7 days after anesthesia performed with 8.0% desflurane for 6 h. Although our previous study revealed postanesthetic effects of isoflurane in adult mice, in the current study, desflurane-treated mice exhibited no such effects in any behavioral test. To further examine whether desflurane affect behavior in more early time point, we built up a new additional test battery, which carried out 1 day or 3 days after exposure to desflurane. Mice treated with desflurane 1 day before testing showed more slips than other two groups in the first trial, suggesting mild acute side effects of desflurane on motor coordination. These results suggest the safety of desflurane in clinical settings and imply that postanesthetic effects are unique to each halogenated ether.

DOI： 10.1097/FBP.0000000000000567

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

Psychoneuroimmunological studies have clearly demonstrated that both cellular and humoral immunity are related to major depression. Soluble ST2 is regarded as a key molecule regulating immune system as well as cell proliferation. Indeed, soluble ST2 is reported to reduce IL-33-induced IL-6 and TNF-α production in macrophages and IL-33-induced IL-5 and IL-13 production in type 2 innate lymphoid cells. Elevated serum concentrations of soluble ST2 have been reported in patients with neuropsychiatric disorders, suggesting pathophysiological roles of soluble ST2 in behavioral phenotypes. Nevertheless, the relation between soluble ST2 and depressive behavior remain to be uncovered. To complement this point, we performed broad behavioral phenotyping, utilizing transgenic mice with a high concentration of serum ST2 in the present study. Soluble ST2 overexpression mice (ST2 Tg mice) were generated on a C3H/HeJ background. ST2 Tg mice crossed onto the BALB/c genetic background were used. Before starting tests, each mouse was observed in a clean cage for a general health check and neurological screening tests. In Experiment I, comprehensive behavioral phenotyping was performed to reveal the role of soluble ST2 on sensorimotor functions, anxiety-like behaviors, depression-like behaviors, social behaviors, and learning and memory functions. In Experiment II, to confirm the role of soluble ST2 on depression-like behaviors, a depression test battery (two bottle choice test, forced swimming test, and tail suspension test) was applied. The general health check indicated good general health and normal gross appearance for ST2 Tg mice. Further, the neurological reflexes of all the mice were normal. We found that soluble ST2 overexpression resulted in decreased social interaction. Moreover, depression-like behaviors of ST2 Tg mice were observed in two well-established behavioral paradigms, the forced swimming test and the tail suspension test. Nevertheless, hedonic reaction to sucrose was observed in ST2 Tg mice similar to WT mice. These results suggest the depression in the ST2 Tg mice. In conclusion, through a series of experiments, we established the animal model for assessing role of soluble ST2 in neuropsychiatric disorders, and revealed the possible involvement of soluble ST2 in depressive behavior.

DOI： 10.1186/s13041-020-00606-4

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Orexins are hypothalamic neuropeptides that regulate feeding, energy expenditure, and sleep. Although orexin-deficient mice are susceptible to obesity, little is known about the roles of the orexin receptors in long-term energy metabolism. Here, we performed the metabolic characterization of orexin receptor-deficient mice. Ox1r-deficient mice were resistant to diet-induced obesity, and their food intake was similar between chow and high-fat food. Ox2r-deficient mice exhibited less energy expenditure than wild-type mice when fed a high-fat diet. Neither Ox1r-deficient nor Ox2r-deficient mice showed body weight gain similar to orexin-deficient mice. Although the presence of a running wheel suppressed diet-induced obesity in wild-type mice, the effect was weaker in orexin neuron-ablated mice. Finally, we did not detect abnormalities in brown adipose tissues of orexin-deficient mice. Thus, each orexin receptor signaling has a unique role in energy metabolism, and orexin neurons are involved in the interactive effect of diet and exercise on body weight gain.

DOI： 10.1016/j.isci.2019.09.003

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：NATURE PUBLISHING GROUP  

Testosterone is involved in male sexual, parental and aggressive behaviors through the androgen receptor (AR) and estrogen receptor (ER) alpha expressed in the brain. Although several studies have demonstrated that ER alpha and AR in the medial preoptic area (MPOA) are required for exhibiting sexual and aggressive behaviors of male mice, the molecular characteristics of ER alpha-and ARexpressing cells in the mouse MPOA are largely unknown. Here, we performed in situ hybridization for neurotransmitters and neuropeptides, combined with immunohistochemistry for ER alpha and AR to quantitate and characterize gonadal steroid receptor-expressing cells in the MPOA subregions of male mice. Prodynorphin, preproenkephalin (Penk), cocaine-and amphetamine-related transcript, neurotensin, galanin, tachykinin (Tac) 1, Tac2 and thyrotropin releasing hormone (Trh) have distinct expression patterns in the MPOA subregions. Gad67-expressing cells were the most dominant neuronal subtype among the ER alpha-and AR-expressing cells throughout the MPOA. The percentage of ER alpha- and AR-immunoreactivities varied depending on the neuronal subtype. A substantial proportion of the neurotensin-, galanin-, Tac2-and Penk-expressing cells in the MPOA were positive for ER alpha and AR, whereas the vast majority of the Trh-expressing cells were negative. These results suggest that testosterone exerts differential effects depending on both the neuronal subtypes and MPOA subregions.

DOI： 10.1038/s41598-017-10213-4

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The brain shows various sex differences in its structures. Various mammalian species exhibit sex differences in the sexually dimorphic nucleus of the preoptic area (SDNPOA) and parts of the extended amygdala such as the principal nucleus of the bed nucleus of the stria terminalis (BNSTpr) and posterodorsal part of the medial amygdala (MePD). The SDN-POA and BNSTpr are male-biased sexually dimorphic nuclei, and characterized by the expression of calbindin D-28K (calbindin 1). However, calbindinimmunoreactive cells are not restricted to the SDN-POA, but widely distributed outside of the SDN-POA. To find genes that are more specific to sexually dimorphic nuclei, we selected candidate genes by searching the Allen brain atlas and examined the detailed expressions of the candidate genes using in situ hybridization. We found that the strong expression of monooxygenase DBH-like 1 (Moxd1) was restricted to the SDN-POA, BNSTpr and MePD. The numbers of Moxd1-positive cells in the SDN-POA, BNSTpr and MePD in male mice were larger than those in female mice. Most of the Moxd1positive cells in the SDN-POA and BNSTpr expressed calbindin. Neonatal castration of male mice reduced the number of Moxd1-positive cells in the SDN-POA, whereas gonadectomy in adulthood did not change the expression of the Moxd1 gene in the SDN-POA in both sexes. These results suggest that the Moxd1 gene is a suitable marker for sexual dimorphic nuclei in the POA, BNST and amygdala, which enables us to manipulate sexually dimorphic neurons to examine their roles in sex-biased physiology and behaviors.

DOI： 10.3389/fnana.2017.00026

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Social separation early in life can lead to the development of impaired interpersonal relationships and profound social disorders. However, the underlying cellular and molecular mechanisms involved are largely unknown. Here, we found that isolation of neonatal rats induced glucocorticoid-dependent social dominance over nonisolated control rats in juveniles from the same litter. Furthermore, neonatal isolation inactivated the actin-depolymerizing factor (ADF)/cofilin in the juvenile medial prefrontal cortex (mPFC). Isolation-induced inactivation of ADF/cofilin increased stable actin fractions at dendritic spines in the juvenile mPFC, decreasing glutamate synaptic AMPA receptors. Expression of constitutively active ADF/cofilin in the mPFC rescued the effect of isolation on social dominance. Thus, neonatal isolation affects spines in the mPFC by reducing actin dynamics, leading to altered social behavior later in life.

DOI： 10.1073/pnas.1606351113

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Collapsin response mediator protein 2 (CRMP2) plays a key role in axon guidance, dendritic morphogenesis and cell polarization. CRMP2 is implicated in various neurological and psychiatric disorders. However, invivo functions of CRMP2 remain unknown. We generated CRMP2 gene-deficient (crmp2(-/-)) mice and examined their behavioral phenotypes. During 24-h home cage monitoring, the activity level during the dark phase of crmp2(-/-) mice was significantly higher than that of wild-type (WT) mice. Moreover, the time during the open arm of an elevated plus maze was longer for crmp2(-/-) mice than for WT mice. The duration of social interaction was shorter for crmp2(-/-) mice than for WT mice. Crmp2(-/-) mice also showed mild impaired contextual learning. We then examined the methamphetamine-induced behavioral change of crmp2(-/-) mice. Crmp2(-/-) mice showed increased methamphetamine-induced ambulatory activity and serotonin release. Crmp2(-/-) mice also showed altered expression of proteins involved in GABAergic synapse, glutamatergic synapse and neurotrophin signaling pathways. In addition, SNAP25, RAB18, FABP5, ARF5 and LDHA, which are related genes to schizophrenia and methamphetamine sensitization, are also decreased in crmp2(-/-) mice. Our study implies that dysregulation of CRMP2 may be involved in pathophysiology of neuropsychiatric disorders.

DOI： 10.1111/gtc.12403

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ObjectiveHigh-fat diet (HFD) consumption causes obesity, which is associated with well-known increased health risks. Moreover, obesity has been associated with altered sensorimotor and emotional behaviors of humans and mice. This study attempted to dissociate the influence of HFD-induced obesity on behaviors from the influence of HFD consumption itself.
MethodsC57BL male mice were randomly allocated to a low-fat diet (LFD) group, an HFD-induced obesity (DIO) group, or a pair-fed HFD-feeding nonobese (HFD) group. A comprehensive behavioral test battery was performed on all three groups to assess sensorimotor functions, anxiety- and depression-like behaviors, reward-related behaviors, social behaviors, and learning/memory functions.
ResultsBoth the DIO and HFD groups exhibited disturbed olfaction, blunted ethanol preference, and enhanced social interactions. The DIO group exhibited blunted sucrose preference, shorter latency before falling off during the rotarod test, and a lower response to mechanical stimuli.
ConclusionsThe HFD-fed nonobese mice showed altered behaviors related to olfaction, social interactions, and rewards that were similar to those of the DIO mice. This finding suggests that HFD consumption alters a variety of behaviors independent of obesity.

DOI： 10.1002/oby.21441

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Isoflurane was previously the major clinical anesthetic agent but is now mainly used for veterinary anesthesia. Studies have reported widespread sites of action of isoflurane, suggesting a wide array of side effects besides sedation. In the present study, we phenotyped isoflurane-treated mice to investigate the postanesthetic behavioral effects of isoflurane. We applied comprehensive behavioral test batteries comprising sensory test battery, motor test battery, anxiety test battery, depression test battery, sociability test battery, attention test battery, and learning test battery, which were started 7 days after anesthesia with 1.8% isoflurane. In addition to the control group, we included a yoked control group that was exposed to the same stress of handling as the isoflurane-treated animals before being anesthetized. Our comprehensive behavioral test batteries revealed impaired latent inhibition in the isoflurane-treated group, but the concentration of residual isoflurane in the brain was presumably negligible. The yoked control group and isoflurane-treated group exhibited higher anxiety in the elevated plus-maze test and impaired learning function in the cued fear conditioning test. No influences were observed in sensory functions, motor functions, antidepressant behaviors, and social behaviors. A number of papers have reported an effect of isoflurane on animal behaviors, but no systematic investigation has been performed. To the best of our knowledge, this study is the first to systematically investigate the general health, neurological reflexes, sensory functions, motor functions, and higher behavioral functions of mice exposed to isoflurane as adults. Our results suggest that the postanesthetic effect of isoflurane causes attention deficit in mice. Therefore, isoflurane must be used with great care in the clinical setting and veterinary anesthesia.

DOI： 10.1371/journal.pone.0122118

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japanese Society of Behavioral Medicine  

The Educational Commission for Foreign Medical Graduates (ECFMG) has announced that, effective in 2023, physicians applying for ECFMG Certification will be required to graduate from a medical school that has been appropriately accredited. To satisfy this requirement, the physician's medical school must be accredited through a formal process that uses criteria comparable to those established for U.S. medical schools by the Liaison Committee on Medical Education or that uses other globally accepted criteria, such as those put forth by the World Federation for Medical Education. In response to this announcement by ECFMG, we must grapple with the core-curriculum proposal of behavioral medicine which satisfy the items as follows: 1) the core-curriculum achieves the globally accepted criteria, 2) it also follows the international trends of behavioral science and medicine, and 3) it also includes the behavioral science and medicine established originally in Japan. To make the appropriate core-curriculum of behavioral medicine, we must define what behavioral science is. In this article, I proposed the framework of behavioral science and the role that Japanese Association of Behavioral Science (JABS) should achieve through the introduction of the history of JABS, the special fields of the JABS members, and the academic activities of JABS.

DOI： 10.11331/jjbm.20.52

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The demand for meta-analyses in basic biomedical research has been increasing because the phenotyping of genetically modified mice does not always produce consistent results. Melanin-concentrating hormone (MCH) has been reported to be involved in a variety of behaviors that include feeding, body-weight regulation, anxiety, sleep, and reward behavior. However, the reported behavioral and metabolic characteristics of MCH signaling-deficient mice, such as MCH-deficient mice and MCH receptor 1 (MCHR1)-deficient mice, are not consistent with each other. In the present study, we performed a meta-analysis of the published data related to MCH-deficient and MCHR1-deficient mice to obtain robust conclusions about the role of MCH signaling. Overall, the meta-analysis revealed that the deletion of MCH signaling enhanced wakefulness, locomotor activity, aggression, and male sexual behavior and that MCH signaling deficiency suppressed non-REM sleep, anxiety, responses to novelty, startle responses, and conditioned place preferences. In contrast to the acute orexigenic effect of MCH, MCH signaling deficiency significantly increased food intake. Overall, the meta-analysis also revealed that the deletion of MCH signaling suppressed the body weight, fat mass, and plasma leptin, while MCH signaling deficiency increased the body temperature, oxygen consumption, heart rate, and mean arterial pressure. The lean phenotype of the MCH signaling-deficient mice was also confirmed in separate meta-analyses that were specific to sex and background strain (i.e., C57BL/6 and 129Sv). MCH signaling deficiency caused a weak anxiolytic effect as assessed with the elevated plus maze and the open field test but also caused a weak anxiogenic effect as assessed with the emergence test. MCH signaling-deficient mice also exhibited increased plasma corticosterone under non-stressed conditions, which suggests enhanced activity of the hypothalamic-pituitary-adrenal axis. To the best of our knowledge, the present work is the first study to systematically compare the effects of MCH signaling on behavioral and metabolic phenotypes.

DOI： 10.1371/journal.pone.0099961

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Vesicular glutamate transporter isoforms, VGluT1-VGluT3, accumulate glutamate into synaptic vesicles and are considered to be important molecules in glutamatergic transmission. Among them, VGluT2 mRNA is expressed predominantly throughout the dorsal thalamus, whereas VGluT1 mRNA is expressed in a few thalamic nuclei. In the thalamic nuclei that project to the retrosplenial cortex (RSC), VGluT1 mRNA is expressed strongly in the anterodorsal thalamic nucleus (AD), is expressed moderately in the anteroventral and laterodorsal thalamic nuclei, and is not expressed in the anteromedial thalamic nucleus. Thus, it has been strongly suggested that a subset of thalamocortical projections to RSC possesses both VGluT1 and VGluT2. In this study, double-labeled neuronal somata showing both VGluT1 and VGluT2 immunolabelings were found exclusively in the ventral region of AD (vAD). Many double-labeled axon terminals were also found in two major targets of vAD, the rostral part of the reticular thalamic nucleus and layers Ia and III-IV of the retrosplenial granular b cortex (RSGb). Some were also found in layer Ia of the retrosplenial granular a cortex (RSGa). These axon terminals contain significant amounts of both VGluTs. Because the subset of thalamocortical projections to RSC has a unique molecular basis in the glutamatergic transmission system, it might play an important role in the higher cognitive functions processed in the RSC. Furthermore, double-labeled axon terminals of a different type were distributed in RSGb and RSGa. Because they are small and the immunoreactivity of VGluT2 is significantly weaker than that of VGluT1, they seemed to be a subset of corticocortical terminals. J. Comp. Neurol. 522:2089-2106, 2014. (c) 2013 Wiley Periodicals, Inc.

DOI： 10.1002/cne.23519

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To determine the developmental trajectory of hippocampal function in rats, we examined 24-h changes in extracellular acetylcholine (ACh) levels and contextual learning performance. Extracellular ACh significantly correlated with spontaneous behavior, exhibiting a 24-h rhythm in juvenile (4-week-old), pubertal (6-week-old), and adult (9- to 12-week-old) rats. Although juveniles of both sexes exhibited low ACh levels, adult males had higher ACh levels than adult females. Moreover, juveniles exhibited much more spontaneous activity than adults when they showed equivalent ACh levels. Similarly, juveniles of both sexes exhibited relatively low contextual learning performance. Because contextual learning performance was significantly increased only in males, adult males exhibited better performance than adult females. We also observed a developmental relationship between contextual learning and ACh levels. Scopolamine pretreatment blocked contextual learning and interrupted the correlation. Since long-term scopolamine treatment after weaning impaired contextual learning in juveniles, the cholinergic input may participate in the development of hippocampus.

DOI： 10.1038/srep03738

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Monoaminergic and neuropeptidergic neurons regulate a wide variety of behaviors, such as feeding, sleep/ wakefulness behavior, stress response, addiction, and social behavior. These neurons form neural circuits to integrate different modalities of behavioral and environmental factors, such as stress, maternal care, and feeding conditions. One possible mechanism for integrating environmental factors through the monoaminergic and neuropeptidergic neurons is through the epigenetic regulation of gene expression via altered acetylation of histones. Histone deacetylases (HDACs) play an important role in altering behavior in response to environmental factors. Despite increasing attention and the versatile roles of HDACs in a variety of brain functions and disorders, no reports have detailed the localization of the HDACs in the monoaminergic and neuropeptidergic neurons. Here, we examined the expression profile of the HDAC protein family from HDAC1 to HDAC11 in corticotropin-releasing hormone, oxytocin, vasopressin, agouti-related peptide (AgRP), pro-opiomelanocortin (POMC), orexin, histamine, dopamine, serotonin, and noradrenaline neurons. Immunoreactivities for HDAC1,- 2,- 3,- 5,- 6,- 7,- 9, and - 11 were very similar among the monoaminergic and neuropeptidergic neurons, while the HDAC4, - 8, and - 10 immunoreactivities were clearly different among neuronal groups. HDAC10 expression was found in AgRP neurons, POMC neurons, dopamine neurons and noradrenaline neurons but not in other neuronal groups. HDAC8 immunoreactivity was detected in the cytoplasm of almost all histamine neurons with a pericellular pattern but not in other neuropeptidergic and monoaminergic neurons. Thus, the differential expression of HDACs in monoaminergic and neuropeptidergic neurons may be crucial for the maintenance of biological characteristics and may be altered in response to environmental factors.

DOI： 10.1371/journal.pone.0058473

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General anesthesia is occasionally associated with postoperative complications such as sleep disorder, drowsiness, or mood alterations. Hippocampal acetylcholine (ACh), the extracellular level of which increases during the dark (active) phase and decreases during the light (rest) phase in rats, is thought to be associated with locomotor activity and be crucial for learning and memory. Propofol, an intravenous anesthetic, is known to shift the circadian rhythms of physiological parameters including locomotor activity and body temperature in both rodents and humans, while the effects of volatile anesthetics on the circadian rhythm largely remain unclear. The present study examined the effects of isoflurane anesthesia on the diurnal changes in hippocampal ACh release and locomotor activity in rats. Rats were divided into three groups: a light-phase anesthesia group (LA group), a dark-phase anesthesia group (DA group), and a control group. They were exposed to a 12-h light/12-h dark environment and anesthetized with 1.4% isoflurane for 4. h during the middle of the light phase (LA group) and dark phase (DA group). Simultaneous measurement of hippocampal ACh by microdialysis and locomotor activity were done for 60. h under free-moving conditions. Hippocampal ACh release and locomotor activity showed a clear circadian rhythm. In the DA group, but not in the LA group, the diurnal variation in ACh release was significantly disturbed and a more than 2-h phase-advance in locomotor activity was observed. There was a significant correlation between hippocampal ACh release and locomotor activity, and isoflurane anesthesia disrupted it even after anesthesia was discontinued. This study revealed that the levels and circadian rhythms of hippocampal ACh release and locomotor activity were more sensitive to isoflurane anesthesia when it was administered during the active phase. Our findings suggest that anesthesia exerts differential effects on the regulation of circadian rhythms depending on the circadian phase. © 2013 IBRO.

DOI： 10.1016/j.neuroscience.2013.01.062

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Intensive insulin therapy to control blood glucose level increases survival among critically ill patients in intensive care unit and hospital. Hyperglycemia is potentially harmful because it acts as a procoagulant, induces insulin resistance, causes apoptosis, impairs neutrophil function, increases the infection rate and is associated with the risk of morbidity and mortality. Hyperglycemia and insulin resistance are virtually universally in sepsis, which is the leading cause of death in critically ill patients. Initially, sepsis is characterized by a hyper-inflammatory response; but as sepsis persists, there is a shift toward an anti-inflammatory immunosuppressive state. The intensive insulin therapy also reduces the infection rate and the mortality in septic patients. Arachidonate cascade is one of the factors associated with hyperglycemia, sepsis and infection. The cascade is involved in the upregulation of proinflammtory cytokines and the dysfunction of immune cells. Especially, we focused on prostaglandin D-2 (PGD(2)), which is produced from innate and adaptive immune cells. PGD(2) is non-enzymatically metabolized to 15-deoxy-Delta(12,14)-PGJ(2), (15d-PGJ(2)). 15d-PGJ(2) is an endogenous ligand for the nuclear receptor, peroxysome proliferators-activated receptor gamma (PPAR gamma) and induces apoptosis in the both immune cells. This review presents plausible roles of arachidonate cascade in hyperglycemia-impaired immunity. Furthermore, we shed light on therapeutic potentials of PPAR gamma ligands for critically ill patients under the insulin resistant state.

File： Yagami et al., 2012.pdf

DOI： 10.2174/157018012800673074

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：1  

Adverse experiences in early life profoundly influence the developing nervous, endocrine, and immune systems, and also affect human behaviour during adult life and are considered in the pathogenesis of psychiatric disorders. Numerous studies have provided evidence that maternal deprivation in the middle of a stress hyporesponsive period (SHRP) causes multiple behavioural and physiological abnormalities that mimic positive symptoms of schizophrenia in humans. To investigate the neurochemical characteristics of maternal deprivation in the middle of the SHRP in the context of a possible animal model of the symptoms of schizophrenia, we examined calcineurin expression in the hippocampus of maternally deprived rats. To investigate other behavioural characteristics, we behaviourally phenotyped the rats by applying a comprehensive behavioural test battery. The results indicate that maternal deprivation in the middle of the SHRP has no effects on general health, neurological reflexes, sensory function, or motor function, but does have sex-specific effects on a type of anxiety-related behaviour in the open field test and male-specific effects on hippocampal calcineurin expression, social behaviour, and objective memory function. An interpretation of our results and previous studies in the context of the neurodevelopmental hypothesis of schizophrenia suggests that maternal deprivation in the middle of the SHRP in rats models some positive and negative aspects of schizophrenia. The findings regarding the sex-specific effects of maternal deprivation in the middle of the SHRP may become a strong tool for investigating sex differences in the pathogenesis and pathology of schizophrenia in humans. (C) 2012 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.bbr.2012.04.016

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER SOC CLINICAL INVESTIGATION INC  

Stressful events during early childhood can have a profound lifelong influence on emotional and cognitive behaviors. However, the mechanisms by which stress affects neonatal brain circuit formation are poorly understood. Here, we show that neonatal social isolation disrupts molecular, cellular, and circuit developmental processes, leading to behavioral dysfunction. Neonatal isolation prevented long-term potentiation and experience-dependent synaptic trafficking of alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptors normally occurring during circuit formation in the rodent barrel cortex. This inhibition of AMPA receptor trafficking was mediated by an increase of the stress glucocorticoid hormone and was associated with reduced calcium/calmodulin-dependent protein kinase type II (CaMKII) signaling, resulting in attenuated whisker sensitivity at the cortex. These effects led to defects in whisker-dependent behavior in juvenile animals. These results indicate that neonatal social isolation alters neuronal plasticity mechanisms and perturbs the initial establishment of a normal cortical circuit, which potentially explains the long-lasting behavioral effects of neonatal stress.

DOI： 10.1172/JCI63060

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Agonists of peroxisome proliferator-activated receptor gamma (PPAR gamma) have been examined as chemopreventive and chemotherapeutic agents. The aim was to investigate the cytotoxicity of troglitazone (TGZ) and its mechanisms in terms of PPAR gamma dependency and the p38 mitogen-activated protein kinase (MAPK) pathway in three human renal cell carcinoma (RCC) cell lines, 786-O, Caki-2 and ACHN cells. TGZ induced apoptosis and exerted cytotoxicity in a PPAR gamma-independent manner. We demonstrated that TGZ activated the p38 MAPK pathway and was involved in the cytotoxicity of TGZ. It was also revealed that TGZ induced G(2)/M cell cycle arrest through activation of p38 MAPK. (C) 2011 Elsevier Ireland Ltd. All rights reserved.

DOI： 10.1016/j.canlet.2011.08.010

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15-deoxy-Delta(12,14)-prostaglandin J(2) (15d-PGJ(2)) is one of factors contributed to the neurotoxicity of amyloid beta (A beta), a causative protein of Alzheimer's disease. Type 2 receptor for prostaglandin D-2 (DP2) and peroxysome-proliferator activated receptor gamma (PPAR gamma) are identified as the membrane receptor and the nuclear receptor for 15d-PGJ(2), respectively. Previously, we reported that the cytotoxicity of 15d-PGJ(2) was independent of DP2 and PPAR gamma, and suggested that 15d-PGJ(2) induced apoptosis through the novel specific binding sites of 15d-PGJ(2) different from DP2 and PPAR gamma. To relate the cytotoxicity of 15d-PGJ(2) to amyloidoses, we performed binding assay [H-3]15d-PGJ(2) and specified targets for 15d-PGJ(2) associated with cytotoxicity. In the various cell lines, there was a close correlation between the susceptibilities to 15d-PGJ(2) and fibrillar A beta. Specific binding sites of [H-3]15d-PGJ(2) were detected in rat cortical neurons and human bronchial smooth muscle cells. When the binding assay was performed in subcellular fractions of neurons, the specific binding sites of [H-3]15d-PGJ(2) were detected in plasma membrane, nuclear and cytosol, but not in microsome. A proteomic approach was used to identify protein targets for 15d-PGJ(2) in the plasma membrane. By using biotinylated 15d-PGJ(2), eleven proteins were identified as biotin-positive spots and classified into three different functional proteins: glycolytic enzymes (Enolase2, pyruvate kinase M1 (PKM1) and glyceraldehyde 3-phosphate dehydrogenase (GAPDH)), molecular chaperones (heat shock protein 8 and T-complex protein 1 subunit alpha), cytoskeletal proteins (Actin beta, F-actin-capping protein, Tubulin beta and Internexin alpha). GAPDH, PKM1 and Tubulin beta are A beta-interacting proteins. Thus, the present study suggested that 15d-PGJ(2) plays an important role in amyloidoses not only in the central nervous system but also in the peripheral tissues.

DOI： 10.1371/journal.pone.0017552

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In the central nervous system, fibroblast growth factor 2 (FGF2) is known to have important functions in cell survival and differentiation. In addition to its roles as a neurotrophic factor, we found that FGF2 caused cell death in the early primary culture of cortical neurons. FGF2-induced neuronal cell death showed apoptotic characters, e.g., chromatin condensation and DNA fragmentation. The ultrastructural morphology of FGF2-treated neurons indicated apoptotic features such as progressive cell shrinkage, blebbing of the plasma membrane, loss of cytosolic organelles, clumping of chromatin, and fragmentation of DNA. Tyrosine kinase inhibitors significantly rescued neurons from FGF2-induced apoptosis. FGF2 potentiated a marked influx of Ca(2+) into neurons before apoptosis. Both a calcium chelator and L-type voltage-sensitive Ca(2+) channel (L-VSCC) blockers attenuated FGF2-induced apoptosis, whereas other blockers of VSCCs such as N-type and P/Q-types did not. Blockers of L-VSCCs significantly suppressed FGF2-enhanced Ca(2+) influx into neurons. Moreover, FGF2 also generated reactive oxygen species (ROS) before apoptosis. Radical scavengers reduced not only the FGF2-generated ROS, but also the FGF2-induced Ca(2+) influx and apoptosis. In conclusion, we demonstrated that FGF2 caused apoptosis via L-VSCCs in the early neuronal culture. (C) 2010 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.yexcr.2010.03.023

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Other Link： http://search.jamas.or.jp/link/ui/2010130540

Language：English   Publishing type：Research paper (scientific journal)   Publisher：12  

Extracellular acetylcholine (ACh) levels in the dorsal hippocampus increases during learning or exploration, exhibiting a sex-specific 24 h release profile. To examine the activational effect of gonadal steroid hormones on the sex-specific ACh levels and its correlation with spontaneous locomotor activity, we observed these parameters simultaneously for 24 h. Gonadectomy severely attenuated the ACh levels, whereas the testosterone replacement in gonadectomized males or 17 beta-estradiol replacement in gonadectomized females successfully restored the levels. 17 beta-Estradiol-priming in gonadectomized males could not restore the ACh levels, and testosterone replacement in gonadectomized females failed to raise ACh levels to those seen in testosterone-primed gonadectomized males, revealing a sex-specific activational effect. Spontaneous locomotor activity was not changed in males by gonadectomy or the replacement of gonadal steroids, but 17 beta-estradiol enhanced the activity in gonadectomized females. Gonadectomy severely reduced the correlation between ACh release and activity levels, but the testosterone replacement in gonadectomized males or 17 beta-estradiol replacement in gonadectomized females successfully restored it. To further analyze the sex-specific effect of gonadal steroids, we examined the organizational effect of gonadal steroids on the ACh release in female rats. Neonatal testosterone or 17 beta-estradiol treatment not only increased the ACh levels but also altered them to resemble male-specific ACh release properties without affecting levels of spontaneous locomotor activity. We conclude that the activational effects of gonadal steroids maintaining the ACh levels and the high correlation with spontaneous locomotor activity are sex-specific, and that the organizational effects of gonadal steroids suggest estrogen receptor-mediated masculinization of the septo-hippocampal cholinergic system.

DOI： 10.1523/JNEUROSCI.5301-08.2009

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Acetylcholine (ACh) release in the dorsal hippocampus increases during stress, exploration or learning, exhibiting sex-specific 24-h release profile. We review the role of gonadal steroids on the ACh release in the dorsal hippocampus. In our studies, we found that male rats showed higher extracellular ACh levels than females, but gonadectomy decreased ACh levels in both sexes of rats and subsequently eliminated the sex difference. To examine the sex difference under comparable gonadal steroid levels, we implanted steroid capsules after gonadectomy. Oestradiol supplementation maintained circulating oestradiol to the levels in proestrous female rats, whereas testosterone capsules maintained circulating testosterone to the levels similar to intact male rats. Under comparable gonadal steroids levels, ACh levels were sex-specific. Testosterone replacement in orchidectomised rats clearly restored ACh levels, which were greater than ovariectomised testosterone-primed rats. Similarly, oestradiol replacement in ovariectomised rats successfully restored ACh levels, which were higher than orchidectomised oestradiol-primed rats. These results suggest sex-specific activational effects of gonadal steroids on ACh release. To further examine the organisational effect, female pups were neonatally treated with oil, testosterone, oestradiol, or dihydrotestosterone. These rats were bilaterally ovariectomised and a testosterone capsule was implanted at postnatal week 8. Neonatal treatment of either testosterone or oestradiol clearly increased ACh levels, whereas neonatal dihydrotestosterone treatment failed to change levels. These results suggest that: (i) gonadal steroids maintain the sex-specific ACh release in the dorsal hippocampus and (ii) neonatal activation of oestrogen receptors is sufficient to mediate masculinisation of the septo-hippocampal cholinergic system.

DOI： 10.1111/j.1365-2826.2009.01848.x

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：1  

The difference in visual object recognition by males and females suggests a sex-specific function in the medial prefrontal cortex (mPFC). In the present study, we performed an in vivo microdialysis study in three groups of rats (males, diestrous females, and proestrous females) to examine the potential sex difference in acetylcholine (ACh) release in the mPFC. The dialysate was automatically collected from the mPFC every 20 min for 24 In under freely moving conditions and the spontaneous locomotor activity was simultaneously monitored. Although ACh release in the mPFC during the dark phase was significantly greater than during the light phase in both sexes, the female rats consistently exhibited a significantly greater mean ACh release than the males. Spontaneous locomotor activity during the dark phase was also significantly greater than during the light phase in both sexes, but the females exhibited significantly greater spontaneous locomotor activity than the males. In addition, both sexes of rats were found to have significant positive correlations between ACh release and spontaneous locomotor activity, but females were found to have significantly greater correlation coefficients than males. Stereological methods were used to examine the number of choline acetyltransferase immunoreactive cells in the nucleus basalis magnocellularis and the horizontal diagonal band of Broca. The number of choline acetyltransferase immunoreactive cells in the nucleus basalis magnocellularis was also greater in females than males, suggesting a contribution to the higher ACh release in females. In contrast, no sex difference in the choline acetyltransferase immunoreactive cells was observed in the horizontal diagonal band of Broca. This is the first report to show a sex difference in the 24-h ACh release profile in the mPFC of behaving rats. (C) 2009 IBRO. Published by Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.neuroscience.2008.12.039

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：3  

We previously reported that feeding with powdered diet after weaning (3 weeks of age) enhanced spatial ability, and increased the amount of acetylcholine (ACh) released in the dorsal hippocampus in female rats. In the present study, to specify the time when feeding conditions caused these effects, a radial 8-arm maze task and an in vivo microdialysis study were performed in both sexes of rats. In rats fed standard laboratory diet (i.e., pelleted diet), males learned the radial 8-arm maze faster than females. Moreover, the ACh release showed a distinct diurnal rhythm which was high during the dark phase and low during the light phase, but males showed a greater amount of ACh released in the dorsal hippocampus than females. However, in rats fed powdered diet after 6 weeks of age, no significant sex differences were observed in the radial 8-arm maze task or in the amount of ACh released, since feeding with powdered diet enhanced spatial ability, and increased the amount of ACh released only in females. These results suggest that feeding conditions after 6 weeks of age may contribute to the sex difference in the spatial ability associated with the changes in the amount of ACh released in the dorsal hippocampus in rats. (C) 2007 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.physbeh.2007.10.016

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：2  

To examine the role of gonadal steroid hormones in the stress responses of acetylcholine (ACh) levels in the hippocampus and serum corticosterone levels, we observed these parameters simultaneously in intact, gonadectomized, or gonadectomized steroid-primed rats. In both sexes of rats, neither gonadectomy nor the replacement of gonadal steroid hormone affected the baseline levels of ACh. However, gonadectomy severely attenuated the stress response of ACh, whereas the replacement of corresponding gonadal hormone successfully restored the response to intact levels. The gonadal hormones affected the serum corticosterone levels in a different manner; the testosterone replacement in orchidectomized rats suppressed the baseline and the stress response of corticosterone levels, whereas the 17 beta-estradiol replacement in ovariectomized rats increased the levels. We further found that letrozole or flutamide administration in intact male rats attenuated the stress response of ACh. In addition, flutamide treatment increased the baseline levels of corticosterone, whereas letrozole treatment attenuated the stress response of corticosterone. Moreover, we found a low positive correlation between the ACh levels and corticosterone levels, depending on the presence of gonadal steroid hormone. We conclude that: 1) gonadal steroid hormones maintain the stress response of ACh levels in the hippocampus, 2) the gonadal steroid hormone independently regulates the stress response of ACh in the hippocampus and serum corticosterone, and 3) the sex-specific action of gonadal hormone on the cholinergic stress response may suggest a neonatal sexual differentiation of the septohippocampal cholinergic system in rats.

DOI： 10.1210/en.2007-0827

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

The sex differences in various motor functions suggest a sex-specific neural basis in the nonprimary or primary motor area. To examine the sex difference in the 24-h profile of acetylcholine (ACh) release in the rostral frontal cortex area 2 (rFr2), which is equivalent to the premotor/supplementary motor area in primates, we performed an in vivo microdialysis study in both sexes of rats fed pelleted or powdered diet. The dialysate was automatically collected from the rFr2 for 24 h under freely moving conditions. Moreover, the number of cholinergic neurons in the nucleus basalis magnocellularis (NBM) was examined. Further, to confirm the relation between ACh release in the rFr2 and motor function, the spontaneous locomotor activity was monitored for 24 h. Both sexes showed a distinct 24-h rhythm of ACh release, which was high during the dark phase and low during the light phase. Female rats, however, showed a greater ACh release and more cholinergic neurons in the NBM than male rats. Similarly, spontaneous locomotor activity also showed a 24-h rhythm, which paralleled the changes in ACh release in both sexes, and these changes were again greater in female rats than in male rats. In addition, feeding with powdered diet significantly increased the ACh release and spontaneous locomotor activity. The present study is the first to report the sex difference in the 24-h profile of ACh release in the rFr2 in rats. The sex specific ACh release in the rFr2 may partly contribute to the sex difference in motor function in rats. (C) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.brainres.2007.04.001

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：11  

The sex difference in the emotional response to stress suggests a sex-specific stress response in the amygdala. To examine the sex difference in extracellular levels of serotonin (5HT) and dopamine (DA) in the basolateral amygdala (BLA) and their responses to restraint stress, in vivo microdialysis studies were performed in male and female rats. In experiment I, dialysates were collected from the BLA at 15-min intervals under the freely moving condition. Mean extracellular levels of 5HT or DA in the BLA were higher in male rats than in female rats. In experiment II, rats were subjected to restraint stress for 60 min to examine the stress response of 5HT or DA levels. Although restraint stress significantly increased extracellular 5HT levels in both sexes of rats, female rats showed a greater response than male rats. Moreover, restraint stress significantly increased extracellular DA levels in female rats, but not in male rats. In experiment III, rats were subjected to restraint stress for 30 min to examine behavioral responses to restraint stress. Although no sex difference was observed in the number of audible vocalizations, male rats defecated a larger number of fecal pellets than female rats. In experiment IV, rats were tested for freezing behavior to examine contextual fear responses. Conditioned male rats showed a longer freezing time than conditioned female rats. We found sex differences in the extracellular levels of 5HT and DA in the BLA and their responses to restraint stress, which may be involved in the sex-specific emotional response to stress in rats.

DOI： 10.1111/j.1460-9568.2006.05214.x

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：2  

We have reported in the past that female rats fed a powdered diet showed better spatial learning and memory functions than female rats a fed pelleted diet. In the present study, we examined the effects of feeding with powdered diet on acetylcholine release in the hippocampus in both sexes of rats. After weaning (3 weeks of age), rats were fed either standard pelleted diet or powdered diet, and after maturation (9-12 weeks of age), they were used in an in vivo microdialysis study, in which no eserine (a cholinesterase inhibitor) was added to the perfusate. The dialysate was collected from the dorsal hippocampus at 20-min intervals underfreely moving conditions for more than 24 h. Acetylcholine in the dialysate was measured by high performance liquid chromatography. As we reported previously, the acetylcholine release showed a clear daily rhythm in both sexes, and males showed significantly greater acetylcholine release in the hippocampus than females in rats fed pelleted diet. Conversely, in rats fed powdered diet, no sex difference in the acetylcholine release was observed, since feeding with powdered diet significantly increased the acetylcholine release only in females. To further examine the number of cholinergic neurons in the medial septum and horizontal limb of the diagonal band of Broca, immunocytochemistry for choline acetyltransferase was performed in both sexes of rats fed either standard pelleted diet or powdered diet. However, neither sex nor feeding conditions affect the number of choline acetyltransferase immunoreactive cells in the areas. These results suggest that powdered diet after weaning enhances spontaneous acetylcholine release in the hippocampus in female rats without changes in the number of cholinergic neurons in the areas. It is possible that this effect of feeding contributes to improve the performance in spatial learning and memory functions in female rats fed powdered diet. (c) 2005 Published by Elsevier Ltd on behalf of IBRO.

DOI： 10.1016/j.neuroscience.2005.08.012

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：2  

We determined whether feeding with powdered diet improved the visuospatial ability in female rats by checking the expression of N-methyl-D-aspartate receptor (NMDAR) subunit 1 (NR1) mRNA in the hippocampus. In rats fed standard pelleted diet, males performed better than females in a radial 8-arm maze task as we reported previously. We found that the expression of NR1 mRNA, which may be the key mediator in visuospatial ability in the hippocampus, was also higher in males than in females. However, in rats fed powdered diet, no sex difference was seen in the radial 8-arm maze task and the expression of NR1 mRNA in the hippocampus, since feeding with powdered diet improved the visuospatial ability with increases in the expression of NR1 mRNA in the hippocampus in females. We suggest that the sex difference in visuospatial ability is at least in part due to feeding conditions. (c) 2005 Elsevier Ireland Ltd and the Japan Neuroscience Society. All rights reserved.

DOI： 10.1016/j.neures.2005.06.013

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人の知性はどう変わる？ ＡＩ（人工知能）に関し、人がどういうふうに関わり、どう使っていくのか。12人の慧眼が照らし出すＡＩ社会の甘夢あるいは悪夢。何か答えを求めるのではなく、議論して探る、それ自体が目的となる会議のありようを模索するアゴラ市民会議。その一環として2019年に実施したイベント「どんな未来を生きていく？ ～ＡＩと共生する人間とテクノロジーのゆくえ～」を電子書籍化したものです。

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File： kohyo-25-t312-1.pdf

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Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)  

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Event date： 2023.10 　 　

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File： 最前線の若手研究者と考える2040年の未来.pdf

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File： シンポジウム：サイエンスを基盤とした共創事業推進に必要な人材－研究と開発を繋ぐナレッジ＆スキルをどう備えるのか－.pdf

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Audience： High school students,　College students,　Teachers,　Guardians,　General,　Media

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File： 心のメカニズム〜自閉症ってなに？〜.pdf

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