2012年2月1日電 /生物谷BIOON/ -- 精神性疾病是中樞神經(jīng)系統(tǒng)發(fā)育異常引起的疾病,,它包括精神分裂癥、憂郁癥、自閉癥和強(qiáng)迫癥等,,其有著復(fù)雜的遺傳因素和對(duì)致病環(huán)境的易感性。陳永君等發(fā)現(xiàn)新穎的AMPA受體調(diào)節(jié)蛋白-Erbin,,有望加速揭開精神疾病的發(fā)病機(jī)制,。
世界衛(wèi)生組織資料顯示世界人口的25% 受到精神性疾病的侵?jǐn)_。神經(jīng)精神類疾病給家庭和社會(huì)帶來(lái)的負(fù)擔(dān),,約占全球疾病總負(fù)擔(dān)的11%,。心理精神疾病病因仍然不清,以往的研究結(jié)果提示中間神經(jīng)元在精神性疾病病理機(jī)制中發(fā)揮重要作用,。抑制性中間神經(jīng)元發(fā)育和突觸傳遞異常是近幾年被特別關(guān)注的可能病理機(jī)制之一,。
Erbin(ErbB2/Her2 結(jié)合蛋白)是近年新發(fā)現(xiàn)的一個(gè)胞內(nèi)蛋白,分子中含有富含亮氨酸的LRRs結(jié)構(gòu)域和PDZ結(jié)構(gòu)域,,屬于LAP家族,。日前,美國(guó)原喬治亞醫(yī)學(xué)院(Georgia Regents University)的科學(xué)家們?cè)诖竽X皮質(zhì),,Erbin特異表達(dá)在抑制性中間神經(jīng)元上的興奮性突觸部位,,調(diào)節(jié)AMPA受體在細(xì)胞表面的表達(dá)。論文第一作者陳永君博士,、沈程勇博士等組成的科研團(tuán)隊(duì)在Erbin基因敲除小鼠中,,parvalbumin蛋白表達(dá)陽(yáng)性的抑制性中間神經(jīng)元AMPA受體介導(dǎo)的突觸電流降低,但興奮性椎體神經(jīng)元不受影響,。他們還發(fā)現(xiàn),, AMPA受體輔助蛋白TARP的γ-2亞型在大腦皮質(zhì)的中間神經(jīng)元中特異表達(dá)。通過(guò)和TARP的γ-2相互作用,,Erbin能夠穩(wěn)定γ-2蛋白,。 在缺失γ-2相互作用結(jié)構(gòu)域的Erbin突變小鼠中,中間神經(jīng)元細(xì)胞表面的AMPA受體表達(dá)下降,,興奮性突觸傳遞減弱,。這兩種Erbin基因突變小鼠都有明顯的精神類行為學(xué)缺陷。這些研究結(jié)果首次表明,,Erbin具有調(diào)節(jié)大腦皮質(zhì)中間神經(jīng)元AMPA受體在細(xì)胞表面表達(dá)的重要功能,。
該原創(chuàng)性研究成果刊發(fā)在2013年2月Nature Neuroscience期刊上,這將有助于人類進(jìn)一步了解精神疾病的發(fā)病機(jī)制,。(生物谷Bioon.com)
了解更多信息 可與陳永君博士聯(lián)系 [email protected]
doi:10.1038/nn.3320
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Erbin interacts with TARP γ-2 for surface expression of AMPA receptors in cortical interneurons
Yanmei Tao, Yong-Jun Chen, Chengyong Shen,Zhengyi Luo, C Ryan Bates, Daehoon Lee, Sylvie Marchetto,Tian-Ming Gao,Jean-Paul Borg,Wen-Cheng Xiong& Lin Mei
Inhibitory neurons control the firing of glutamatergic neurons and synchronize brain activity. However, little is known about mechanisms of excitatory synapse formation in inhibitory neurons. Here we demonstrate that Erbin is specifically expressed in cortical inhibitory neurons. It localizes at excitatory synapses and regulates AMPA receptor (AMPAR) surface expression. Erbin mutation reduced mEPSCs and AMPAR currents specifically in parvalbumin (PV)-positive interneurons but not in pyramidal neurons. We found that the AMPAR auxiliary protein TARP γ-2 was specifically expressed in cortical interneurons. Erbin interacts with TARP γ-2 and is crucial for its stability. Deletion of the γ-2–interacting domain in Erbin attenuated surface AMPAR and excitatory transmission in PV-positive interneurons. Furthermore, we observed behavioral deficits in Erbin-null mice and in mice expressing an Erbin truncation mutant that is unable to interact with TARP γ-2. These observations demonstrate a crucial function for Erbin in AMPAR surface expression in cortical PV-positive interneurons and may contribute to a better understanding of psychiatric disorders.