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Indices of auditory response state characterized from the latency of local auditory evoked potentials

Indices of auditory response state characterized from the la...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Fei-Xue LIANG~(1,2),Xiao-Jun ZHENG~1,Qing-Kai DENG~2,Zhong-Ju XIAO~(1,*) 1 Department of Physiology,2 Department of bioinformatics,School of Basic Medical Sciences,Southern Medical University,Guangzhou 510515,China

The idea,auditory information might be encoded in the spike timing,rather than in neuronal firing rates, has been attracting increasing attention from the 90 s of last *** remains unclear,however,whether or not spike timing might encode the response state of auditory *** we investigated the latency characteristics of local auditory evoked potentials(LAEPs)in mice inferior colliculus during pentobarbital induced continuously change of response state of auditory *** intraperitoneal infusion of sodium pentobarbital,LAEPs evoked by different stimulus intensities were recorded as a dataset every 10 minutes(defined as a recording session).Then the latency from the beginning of sound delivery to the first negative peak(N1)of each LAEP on all the recording sessions during anesthesia was extracted and plotted as a function of stimulus *** further analysis the data,we employed a double coordinate axis fitting shift algorithm(DCAFSA)basing on Pieron's empirical law to calculate the latency shift of each latency-intensity function,which were plotted as a function of recording *** result showed that the latency shift prolonged to a plateau and then shortened smoothly with recording session after the pentobarbital ***,similar phenomenon was more clearly observed across populations of recording sites and animals. By abdominal administration,the absorption and metabolism of anesthetics would result in a reversible time-effect relationship,which will change the response state of auditory system in ***,the latency shift of LAEPs is a potential index to quantitatively encode the auditory response state.

关键词： response state of auditory system local auditory evoked potentials latency shift

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HAPl protein involved in the transport of KV2.1 in PC12 cells

HAPl protein involved in the transport of KV2.1 in PC12 cell...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Jun HE,Dan WANG,Jing-Ying PAN,Cai ZHANG,He LI~* Division of Histology and Embryology,Tongji Medical College,Huazhong University of Science and Technology, Wuhan 430030,China

Objective Huntingtin-associated protein-1(HAP1) is the first protein identified to interact with the Nterminus of huntingtin(htt).However,the function of HAP1 remains *** present study is to explore the effect of HAP1 on the membrane transport of KV2.1 in PC12 *** SiRNAs(small interfering RNAs) technique was used to silence the expression of HAP1 in PC12 *** current was recorded by whole-cell patch clamp technique and RT-PCR was used to observe the effect of HAP1 silencing on the mRNA expression of Kv2.1 in PC12 *** technique was used to observe the effects of HAP1 protein on Kv2.1 potassium channel cytoplasmic expression and membrane transport in PC12 ***(1) The silence of HAP1 inhibited the voltage-sensitive potassium current and induced slightly up-regulation of the Kv2.1 mRNA expression in PC12 cells.(2) The silence of HAP1 increased the cytoplasmic expression of Kv2.1 but inhibited the membrane transport of KV2.1. Conclusion HAP1 can regulate the membrane transport of KV2.1 expressed in PC12 cells.

关键词： HAPl voltage-sensitive K+ current patch clamp Kv2.1 PC 12 cells small interfering RNAs

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Knockdown of disrupted-in-schizophrenia-1 function specifically in adult-born dentate gyrus neurons results in schizophrenia-related phenotypes

Knockdown of disrupted-in-schizophrenia-1 function specifica...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Alcino Silva Department of Neurobiology Semel InstituteDepartment of PsychologyBrain Research Instituteand Department of UrologyUniversity of CaliforniaLos AngelesCA 90095USA

＜正＞Objective Irreversible abnormalities during brain development are thought to cause neurodevelopmental disorders such as *** processes,such as cell migration and differentiation,continue in restricted brain regions of adults,including neurogenesis in the subgranular zone of the dentate gyrus（DG）.To test the role of these adult developmental processes in phenotypes associated with schizophrenia,we specifically disrupted the expression of DISC1,an important susceptibility gene for schizophrenia,in DG newborn neurons in the adult brain. The present study is to explore whether DISC1 knockdown in DG adult-born neurons caused behavioral and cognitive deficits associated with psychiatric *** High titers of oncoretroviruses engineered to knock-down DISC1 with an shRNA approach was stereotaxically injected into the dentate gyrus of *** weeks after surgery, Morris water maze,object-place recognition task,elevated plus maze and forced swimming were carried *** （1） DISC1 regulates morphogenesis and axonal targeting of adult-born dentate gyrus neurons;（2） DISC1 knockdown in adult-born neurons impairs hippocampal-dependent learning and memory;（3） DISC1 knockdown in adult-born neurons results in other schizophrenia-related phenotypes;（4） Rapamycin rescues the deficits in the water maze and forced swimming caused by DISC1 knockdown in adult-born *** Although schizophrenia is a neurodevelopmental disorder,our findings suggest that a component of the behavioral and cognitive phenotypes associated with this and perhaps other neurodevelopmental disorders may actually be caused by adult disruptions in DG newborn ***,treatments directed at correcting these molecular and cellular deficits in adultborn DG neurons may have a significant impact on neurodevelopmental disorders such as schizophrenia.

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Involvement of spinal microglia in the anti-hyperalgesic effects of gabapentin in rat model of monoarthritis

Involvement of spinal microglia in the anti-hyperalgesic eff...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Jia-Le YANG~1,Bo XU~2,Wei-Shi ZHANG~(3*),Hua XU~2,Xiao-Ming DENG~2,Yu-Qiu ZHANG~(1,*) 1 Institute of Neurobiology,Institutes of Brain Science and State Key Laboratory of Medical Neurobiology,Fudan University,Shanghai 200032,China 2 Department of Anesthesiology,Xinhua Hospital,Shanghai Jiaotong University School of Medicine,Shanghai 200092, China 3 Department of Anesthesiology,Changhai Hospital,The Second Military Medical University,Shanghai 200433,China

This study investigated the effects of gabapentin on spinalα2/δ-l subunit of voltage-gated calcium channels (VGCCs),fractalkine,CX3CR1 expression levels and glial activation,as well as thermal hyperalgesia evoked by monoarthritis(MA).MA produced a robust upregulation of VGCCsα2/δ-l subunit,fractaline,CX3CR1 expression levels,and activation of microglia and astrocytes in the spinal cord,which was associated with the development of thermal *** showed thatα2/δ-1 subunit of VGCCs,a proposed action target of gabapentin,was wildly distributed in primary afferent fibers terminals and dorsal horn ***,a potential trigger to activate microglia,colocalized withα2/δ-1 subunit of VGCCs in superficial spinal cord,whereas its receptor CX3CR1 was mainly expressed in spinal ***(i.p.)gabapentin significantly downregulated spinalα2/δ-l subunit of VGCCs and fractalkine levels,suppressed microglial activation and blocked the development of thermal hyperalgesia in MA *** data suggest that gabapentin may diminish fractalkine release in the spinal cord via modulatingα2/δ-1 subunit of VGCCs,thereby leading to the reduction in spinal glial activation and thermal hyperalgesia.

关键词： fractalkine gabapentin glial activation monoarthritis thermal hyperalgesia α2/δ-1 subunit of voltagegated calcium channels(VGCCs)

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A Cl--regulated structural switch that controls proton sensitivity of acid-sensing ion channels

A Cl--regulated structural switch that controls proton sensi...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Wei-Guang LI~(1,2),Zhu-Dan ZHANG~(1,2),Hui CAO~1,Tian-Le XU~(1,3,*) 1 Institute of Neuroscience and State Key Laboratory of Neuroscience,Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences,Shanghai 200031 2 Graduate School of Chinese Academy of Sciences,Shanghai 200031,China 3 Institute of Medical Sciences,Shanghai Jiaotong University,Shanghai 200025

Acid-sensing ion channel（ASIC） has a prominent role in tissue pH-sensing and neuronal signaling,and participates in various pathological *** the availability of structures for chicken ASIC1 subunit, obtaining mechanistic insight into the function of these highly dynamic channel proteins using static crystallographic information is *** a series of mutational,chemical and functional approaches,we found that the extracellular CI-binding module shown in crystals of ASIC1 constitutes an indispensable component for ASIC1a *** gluconate-substitution of natural CI-binding enhanced whereas engineering a permanent anion into the CI-binding module inhibited channel activity,suggesting an essential role of CI-regulated domain flexibility but not the absolute charge state created by bound anion in channel ***-comparable anion substitution（F, Br-,or I） revealed a CI-dependent modulation of proton sensing function,supporting a structural role of dynamic association and dissociation of CI ion in coordinating conformational transition associated with proton sensing. Furthermore,charge reversal and swap as well as mutant cycle analysis of alanine substitutions of two counter-charged residues（K311,E315） in the CI-binding module show that they electrostatically interacted and energetically coupled, underpinning a structural switch controlling proton sensitivity of ASIC1a channels.

关键词： acid-sensing ion channel channel gating salt bridge

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Language specificity in the neural processing of auditory feedback during vocal production

Language specificity in the neural processing of auditory fe...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Zhao-Cong CHEN,Han-Jun LIU~* Department of Rehabilitation Medicine,The First Affiliated Hospital,Sun Yat-sen University,Guangzhou 510080, China

Objective Auditory feedback has been demonstrated to play an important role in the control of voice fundamental frequency(FO),but neural mechanisms underlying this control process are poorly *** present cross-language study was to examine whether there is a language-dependent neural processing of auditory feedback by measuring event-related potentials(ERPs) to pitch perturbations during sustained vocalizations of Cantonese and Mandarin *** Native speakers of Cantonese and Mandarin participated in this *** were asked to sustain a vocalization of a vowel sound /u/ at their comfortable habitual FO level for about 5 s,during which their voice pitch feedback was unexpectedly shifted 5 times(- 50,- 100,- 200,or - 500 cents,200 ms duration) and fed back instantaneously to them over *** ERPs to these pitch-shifted stimuli were measured and analyzed across *** Significantly larger amplitudes of P2 were produced by Cantonese speakers as compared to Mandarin speakers when voice pitch feedback was shifted from 200 to 500 cents,while no significant differences were found in P2 amplitude between them in the case of 50 and 100 cents *** addition,a systematic change of P2 amplitude across pitch perturbation magnitude was found for Cantonese speakers but not for Mandarin *** Neural representations of pitch errors in voice FO control can be modulated by subjects' exposure to different languages,and differential effects of pitch perturbation magnitude on the cortical processing of auditory feedback between Mandarin and Cantonese speakers may be related to the specific tonal features of these two languages.

关键词： auditory feedback pitch perturbation event-related potential tonal language

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Flavonoid reduces mutant huntingtin cytotoxicity through activating degradation by ubiquitin-proteasome system

Flavonoid reduces mutant huntingtin cytotoxicity through act...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： AA Mohmmed Department of Anatomy Tongji Medical CollegeHuazhong University of Science and Technology

Huntington's disease(HD) is a familial neurodegenerative disorder caused by an aberrant expansion of polyglutamine in the N-terminal region of huntingtin(Htt) and is characterized by restricted neurodegeneration and presence of misfolded huntingtin aggregates in *** is currently no effective therapy to prevent or to delay disease *** the mechanism by which the mutant Htt(mHtt) causes neuronal degeneration remains unclear,impairment of ubiquitin-proteasome system(UPS) and oxidative stress have been proved to play important roles in the pathogenesis of ***,a large group of natural compounds with antioxidant activities,have been proposed to exert beneficial effects in neurodegenerative disorders and possess *** this study,a group of flavonoid were used and their protective effects in HD cell and transgenic mouse model were *** was found that the flavonoid treatment dose-dependently inhibited the decrease in cell viability caused by transfection of *** HD transgenic mice,the life span was significantly prolonged and the neurological signs such as movement disorder were effectively improved by treatment with *** was further demonstrated that flavonoid can increase ubiquitination of proteins,the level of C-terminal Hsp70-interacting protein(CHIP) and degradation of mHtt *** also detected the increase in expression of NF-E2-related factor 2(Nrf2) and its downstream heme oxygenase 1(Homx-1) gene,which was companied by the increase in expression of Akt and decrease in expression of GSK3-β.Our results reveal for the first time that flavonoid can protect against toxicity of mHtt,which may be mediated by activating degradation of mHtt by UPS via anti-oxidation and then restoring cell survival signaling *** protective effect of flavonoid on mutant huntingtin-induced cytotoxicity provides a new perspective on treatment of HD.

关键词： Huntington's disease huntingtin cytotoxicity flavonoid anti-oxidation

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Expressions of the imprinted genes from cluster Dill-Dio3 in corticospinal projection neurons

Expressions of the imprinted genes from cluster Dill-Dio3 in...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： CS QU,YJ YANG,HP TAO,J QU,JG CHEN~* School of Ophthalmology and Optometry,Wenzhou Medical Collage,the Key Laboratory of Visual Science,Wenzhou, China

The corticospinal projection neurons(CSPN),originated from the layer V of cerebral cortex,generate neural impulses and control execution of *** of CSPN give rise to upper motor neuron(UMN) *** identify the molecules of the motor neuron related diseases,we labeled the CSPN of postnatal mice by a retrograde tracer Red Beads,and isolated them by laser capture micro-dissection(LCMD).Started with gene expression screening,we found that maternally expressed gene 3(Meg3) and Meg8 were highly enriched in CSPN during the early ***3 and Meg8 are colocalized with Ctip2,a marker of the layer ***3 and Meg8 are from a transcription unit located in the imprinted cluster Dill-Dio3,whereas a paternally expressed gene Rtll is known in the opposite *** had a minimal expression in the cortex as determined by in situ hybridization. The homologous genes Meg3 and Meg8 were also expressed in the deep cortical layer in a human brain of 27 week *** different expression pattern between Meg3 and Rtll suggests that the maternally genetic contributions may be important for the early cortical *** effect is directed to identify the micro RNAs in Dill- Dio3 that inhibit the expression of *** study may help us to better understand the human disorders due to the maternally deletion of this imprinted cluster.

关键词： CSPN LCMD imprinted gene Meg3 Rtll

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The role of extrasynaptic N-methyl-D-aspartate receptors in earlystage epileptogenesis

The role of extrasynaptic N-methyl-D-aspartate receptors in ...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Dan-Dan LIU,Jue-Gang JU,Sheng-Tian LI~* Laboratory of Synaptic Signaling and Behavioral Neurosciences,School of Life Sciences and Biotechnology,Shanghai Jiao Tong University,Shanghai 200240,China

Objective Previous reports have shown that N-methyl-D-aspartate(NMDA) receptors are extensively involved in epilepsy genesis and *** studies have shown that synaptic and extrasynaptic NMDA receptors play different,or even opposing,roles in various signaling pathways,including synaptic plasticity and neuronal ***,few studies have focused on the role of extrasynaptic NMDA receptors in epileptogenesis. Therefore,in the present study we analyzed extrasynaptic NMDA receptor-mediated currents during the early stage of *** Adult C57BL/6 mice models of pilocarpine-induced epilepsy were established,and hippocampal slices were prepared at 24 h after the onset of status *** in synaptic and extrasynaptic NMDA receptor-mediated excitatory post-synaptic currents(NMDA-EPSCs) were recorded in CA1 pyramidal neurons by whole-cell patch clamp ***(1) There were no significant differences in synaptic NMDA-EPSCs between pilocarpine(n=10) and control(n=7) groups in terms of rise time and decay time.(2) Similarly,the peak amplitudes and rise time of extrasynaptic NMDA-EPSCs were not statistically different between the 2 groups. (3) However,extrasynaptic NMDA-EPSCs decayed significantly faster in the pilocarpine-treated *** During the early stage of epileptogenesis,the channel properties of extrasynaptic but not synaptic NMDA receptors were *** data suggest that extrasynaptic NMDA receptors play an important role in epileptogenesis.

关键词： epilepsy NMDA receptor extrasynaptic synaptic

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Formaldehyde increases intracellular calcium concentration in primary hippocampus neurons

Formaldehyde increases intracellular calcium concentration i...

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Ye-Nan CHI~a,Guo-Gang XING~(a,b,*),Xu ZHANG~c,Jie CAI~a,Feng-Yu LIU~a,You WAN~(a,b,*) a Neuroscience Research Institute and Department of Neurobiology,Peking University,38 Xue-Yuan Road,Beijing 100191,China bKey Laboratory for Neuroscience of the Ministry of Education and the Ministry of Public Health,38 Xue-Yuan Road, Beijing 100191,China c Central Laboratory,Key Laboratory for Neurodegenerative Diseases of Ministry of Education,Xuanwu Hospital, Capital Medical University

It has been demonstrated that cancer tissues can secret endogenous *** the central nervous system,formaldehyde at pathological concentration can induce misfolding and aggregation of neuronal tau in hippocampus neurons,which is closely related to *** present study aims to find the involved ion channels of formaldehyde effect on hippocampus *** calcium is an important intracellular messenger,playing a key role in the whole cell *** on the changes of intracellular calcium signaling([Ca])by confocal images,we found that formaldehyde at a low concentration（1 mM）could increase[Ca] in primary cultured hippocampal neurons by one ***（2R）-amino-5-phosphonopentanoate（AP5,25μM,a selective NMDAR antagonist）and mibefradil（1μM,a blocker of T-type calcium channels）,given five minutes after formaldehyde perfusion,partially reverses the increased[Ca] of hippocampus neurons,and this effect could be reinforced when they are given *** minutes before formaldehyde perfusion,AP5（even at 50μM）could not inhibit the formaldehyde-induced[Ca] *** mibefradil（1μM）,given three minutes before formaldehyde,can significantly inhibit formaldehyde effect nearly by *** results suggest that formaldehyde at a very low pathological concentration could increase intracellular calcium concentration in hippocampal neurons;NMDA receptors and T-type calcium channels are the main potential targets of formaldehyde.

关键词： formaldehyde intracellular calcium hippocampal neurons T-type calcium channels NMDA receptors

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