基酶6型的删除通过处理受损的左心室功能下降
Tong Tang1, Mei Hua Gao, N Chin Lai
1Department of Medicine, University of California, San Diego, USA.
Circulation
|December 12, 2007
概括
在小鼠中,基酶6 (AC6) 缺失会通过减少cAMP的产生和的处理而损害心脏功能. 这突出了AC6的特点.
科学领域:
- 心血管生理学心血管生理学
- 分子心脏病学分子心脏病学
- G-蛋白结合受体信号传递
背景情况:
- 腺基环酶 (ACs) 是关键的G蛋白结合受体作用因子.
- 腺基环酶5 (AC5) 和腺基环酶6 (AC6) 在心脏肌细胞中高度表达.
- 在心脏中AC6的特定生理作用仍然未被定义.
研究的目的:
- 调查亚地尼环酶6 (AC6) 在心脏生理学中的特定作用.
- 确定AC6缺失在成人心脏中的功能后果.
- 阐明心脏功能的AC5和AC6之间的差异.
主要方法:
- 产生了转基因小鼠,有针对性地删除了腺基环酶6 (AC6).
- 评估左心室收缩功能和放松.
- 在心脏肌细胞中测量了β-上腺素受体刺激的cAMP生产和蛋白激酶A活性.
- 评估了福兰班的酸化,sarcoplasmic网膜的Ca2+-ATPase活性和的短暂形成.
主要成果:
- 删除AC6显著减少左心室收缩功能和放松.
- 缺少AC6导致cAMP生产和蛋白激酶A活性显著下降.
- 缺失AC6导致处理受损,包括减少胺的酸化和sarcoplasmic网膜Ca2+-ATPase活性.
结论:
- 由于AC6删除,心脏cAMP生成和处理受损是左心室功能异常的基础.
- 腺基环酶6在成人心脏生理学中起着关键的,非冗余的作用.
- AC6在心脏中具有独特的生物功能,与AC5不同.
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