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在NBCe1-B/C-Knockout小鼠中发现左心室缩功能障碍.

Clayton T Brady1, Aniko Marshall1, Lisa A Eagler2

  • 1Department of Physiology and Biophysics, Jacobs School of Medicine and Biomedical Sciences, State University of New York: The University at Buffalo, Buffalo, NY 14203, USA.

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概括

与NBCe1基因突变相关的先天近端管酸性化症 (pRTA) 损害了心脏功能. 缺乏NBCe1-B/C的小鼠表现出心脏收缩率降低和心脏节律改变,尽管没有心脏缩.

关键词:
这是NBCe1的.酸酸的基础.和是最重要的.收缩性 收缩性的心脏衰竭是因为心脏衰竭.这就是为什么 pRTARTA.

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科学领域:

  • 分子生物学分子生物学
  • 心血管生理学心血管生理学
  • 遗传学 遗传学 是一个

背景情况:

  • 先天性近位管酸性化症 (pRTA) 是一种罕见的遗传性疾病,由SLC4A4基因突变引起,影响NBCe1二碳酸共运输体.
  • NBCe1有多种变体 (NBCe1-A, -B, -C) 具有不同的组织表达;NBCe1-B对心脏功能至关重要.
  • 以前对大鼠的研究表明,NBCe1-B 缺乏导致心脏缩和延长 QT 间隔,但先天性,全球性 NBCe1 损失对心脏的影响仍然未知.

研究的目的:

  • 在具有先天性,全球缺失NBCe1-B和NBCe1-C变异的幼年小鼠 (NBCe1-B/C-null小鼠) 中研究心脏功能.
  • 评估心脏收缩性,电生理学和心肌细胞处理在没有混性酸性血症的情况下.
  • 为了确定先天性NBCe1-B/C缺陷对心脏表型的影响,独立于全身性酸性疾病.

主要方法:

  • 在生存到2个月的NBCe1-B/C-null小鼠心脏功能的表征.
  • 使用心脏重量与身体重量的比率和心肌细胞横截面积来评估心脏缩.
  • 心声学,心室内压力-体积循环分析,并使用Fura-2 AM测量隔离心肌细胞中的Ca2+过渡物.

主要成果:

  • 与对照组相比,NBCe1-B/C-null小鼠没有表现出心脏缩.
  • 心声扫描显示左心室喷射分数减少,压力-体积测量显示负载独立心脏收缩能力受损.
  • 在NBCe1-B/C-null小鼠中观察到心肌细胞中增加了QT长度变化和减少了Ca2+短暂幅度.

结论:

  • 在青少年小鼠中,先天性,全球缺少NBCe1-B/C变异导致心脏收缩能力受损和QT长度变化增加.
  • 这些小鼠的心脏表型的特点是功能缺陷,而不是结构变化,如缩.
  • 需要进一步的研究来阐明神经元和内分泌NBCe1-B/C缺失对观察到的心脏表型的影响.