一个电中性/二碳酸盐共传输体 NBCn1 和相关的通道
I Choi1, C Aalkjaer, E L Boulpaep
1Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, Connecticut 06520, USA.
Nature
|June 13, 2000
概括
研究人员确定了对细胞内pH调节至关重要的新型电中性二碳酸共传输体 (NBCn1) 变体. 这些载体在哺乳动物细胞中依赖和二碳酸盐,但不依赖化物.
科学领域:
- 身体生理学 身体生理学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 细胞内pH调节对于细胞功能至关重要.
- 电子中性Na+驱动的HCO3-输送器,包括Na+驱动的Cl-/HCO3-交换器和Na+/HCO3-共输送器,发挥关键作用.
- 在哺乳动物细胞中区分这些载体的Cl-依赖是具有挑战性的.
研究的目的:
- 从老鼠光滑肌肉中克隆和特征化一种电子中性Na+/HCO3-共传输体 (NBCn1) 的变体.
- 确定克隆的NBCn1变体的功能性质,包括离子依赖性.
- 调查与NBCn1表达相关的Na+导电性的潜力.
主要方法:
- 从老鼠光滑肌肉中克隆了三种NBCn1变体.
- 在Xenopus卵细胞中表达NBCn1-B变异.
- 对NBCn1-B的功能性表征,评估Na+,HCO3-和Cl-依赖性.
- 使用电生理学和一种特定的抑制剂 (4,4-二二基亚诺乙烯-2,2'-二硫酸盐) 分析Na+电导率.
主要成果:
- 克隆了三种NBCn1变体,它们与人类骨肌肉克隆具有很高的相同性,与电源NBC和离子交换器具有较低的相同性.
- 发现表达的NBCn1-B是电子中性,依赖Na+和HCO3-,但独立于Cl-.
- 卵细胞中NBCn1-B的低水平表达诱导了缓慢且不可逆转地刺激的Na+导电性.
结论:
- NBCn1代表了一个独特的类别的电子中性Na+/HCO3-共传输体.
- 独立于化物,NBCn1在细胞pH稳态中起着重要作用.
- 通过相关的Na+导电性,NBCn1可能有助于细胞刺激.
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