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磷酸果糖激酶缺乏症(Ⅶ型糖原累积病、Tarui病)

Authors
William J Craigen, MD, PhD
Basil T Darras, MD
Section Editor
Sihoun Hahn, MD, PhD
Deputy Editor
Elizabeth TePas, MD, MS
Translators
赵岩, 副主任医师

引言

糖原是葡萄糖的贮存形式,当机体需要葡萄糖时起缓冲储备作用。它是α-1,4糖苷键连接的长链聚合物,每4-10个残基由α-1,6糖苷键构成支链。糖原是在饮食碳水化合物负荷期形成的,在葡萄糖需求量较大或能获得的饮食较少时进行分解(图 1)。

对于编码参与糖原合成、分解或调节的几乎所有蛋白质的基因,发生突变时都可导致多种先天性糖原代谢病。可导致糖原异常储存的疾病被称为糖原累积病(glycogen storage disease, GSD)。这类疾病主要是根据发现相关酶缺乏症的年代编号来进行分类(表 1)。发病年龄可有所差异,从胎儿到成人期不等。

在肝脏和肌肉组织中所含糖原最丰富,其也是该疾病最常累及的部位。肝脏及肌肉中某一特定酶的生理意义决定疾病的临床表现。

肝糖原的主要作用是存储葡萄糖,以便在空腹期间释放葡萄糖以供应不能大量合成葡萄糖的组织。累及肝脏的糖原代谢疾病主要表现为低血糖和肝肿大。 (参见“糖尿病患者和正常人对低血糖的生理应答”)

糖原可为ATP合成提供底物,是高强度肌肉活动的主要能量来源。累及肌肉的糖原代谢障碍的主要表现为肌肉痉挛、运动不耐受和易疲劳,以及进行性肌无力。

      

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Literature review current through: 2017-06 . | This topic last updated: 2016-08-16.
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