生物谷報道:根廷布宜諾斯艾利斯大學(xué)和巴西南大河州天主教主教大學(xué)的科學(xué)家,,在對老鼠投喂了超劑量的蛋白質(zhì)腦源性神經(jīng)營養(yǎng)因子(BDNF)后發(fā)現(xiàn),,老鼠記憶在大腦中的持續(xù)過程從7倍提高到10倍,,也就是說,蛋白質(zhì)可以決定記憶在大腦中持續(xù)時間的長短,。相關(guān)科研成果發(fā)表在近期的《美國國家科學(xué)院刊》上,。
巴西南大河州天主教主教大學(xué)科學(xué)家馬丁.卡瑪羅達(dá)認(rèn)為,蛋白質(zhì)BDNF對大腦特定區(qū)域中的記憶支撐是關(guān)鍵性的,。在試驗中發(fā)現(xiàn),,這種蛋白質(zhì)對事前經(jīng)過藥品處理、在特定區(qū)域消除所有蛋白質(zhì)產(chǎn)生的老鼠的失憶過程有一種逆轉(zhuǎn)作用,。研究人員認(rèn)為,,他們的發(fā)現(xiàn)開辟了研制對抗損傷記憶力神經(jīng)性退化疾病藥品的道路。
卡瑪羅達(dá)表示,,目前還不能像對老鼠那樣,,將蛋白質(zhì)BDNF直接注入人的大腦,因為這存在著不確定的風(fēng)險,,但可以研究這一過程中神經(jīng)化學(xué)和神經(jīng)解剖學(xué)機理,。他認(rèn)為,根據(jù)目前的研究成果,,已經(jīng)可以對蛋白質(zhì)BDNF在人的大腦中的作用進行間接試驗,,例如使用已知的安全藥品對健康的年輕人或老年人進行試驗,就可以掌握蛋白質(zhì)BDNF在大腦中蓄積的程度,。一旦取得一定進展,,就可以將試驗擴展到罹患神經(jīng)退化性疾病的患者,如早期阿耳茨海默癥患者,。此外,,科學(xué)家認(rèn)為,還可以通過這項研究,探索記憶的持續(xù)性與強度之間的相互關(guān)系,。(生物谷援引科技日報)
生物谷推薦原始出處:
Published online on February 8, 2008
Proc. Natl. Acad. Sci. USA, 10.1073/pnas.0711863105
NEUROSCIENCE
BDNF is essential to promote persistence of long-term memory storage
Pedro Bekinschtein*, Martín Cammarota, Cynthia Katche*, Leandro Slipczuk*, Janine I. Rossato, Andrea Goldin*, Ivan Izquierdo,, and Jorge H. Medina*,
*Instituto de Biología Celular y Neurociencias and Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina; and Centro de Memória, Instituto de Pesquisas Biomédicas, Pontifical Catholic University of Rio Grande do Sul, RS 90610-1121 Porto Alegre, Brazil
Contributed by Ivan Izquierdo, December 20, 2007 (sent for review November 30, 2007)
Abstract
Persistence is a characteristic attribute of long-term memories (LTMs). However, little is known about the molecular mechanisms that mediate this process. We recently showed that persistence of LTM requires a late protein synthesis- and BDNF-dependent phase in the hippocampus. Here, we show that intrahippocampal delivery of BDNF reverses the deficit in memory persistence caused by inhibition of hippocampal protein synthesis. Importantly, we demonstrate that BDNF induces memory persistence by itself, transforming a nonlasting LTM trace into a persistent one in an ERK-dependent manner. Thus, BDNF is not only necessary, but sufficient to induce a late postacquisition phase in the hippocampus essential for persistence of LTM storage.
consolidation | hippocampus | forgetting | ERK1/2