Atrioventricular conduction and arrhythmias at the initiation of beating in embryonic mouse hearts.

Atrioventricular conduction and arrhythmias at the initiation of beating in embryonic mouse hearts.
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DOI:
10.1002/dvdy.22319
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发表时间:
2010-07
影响因子:
2.5
通讯作者:
Weiss, James N.
Weiss, James N.
中科院分区:
生物学3区
文献类型:
--
作者:
Chen, Fuhua;De Diego, Carlos;Chang, Marvin G.;McHarg, Jennifer L.;John, Scott;Klitzner, Thomas S.;Weiss, James N.

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为了研究胚胎小鼠心脏心跳开始时的心脏生理学,我们对膜电位(Vm)和/或细胞内钙(Cai)进行了光学成像。在 E8.5 时约 50% 的小鼠胚胎心脏中检测到动作电位和 Cai 瞬变,但在 E9.0 时在所有心脏中检测到动作电位和 Cai 瞬变,表明跳动通常在 E8-E9 之间开始。 Ca 通道阻滞剂硝苯地平和 If 阻滞剂 ZD7288 可消除搏动,不受河豚毒素影响,仅通过禁用肌浆 (SR) 和内质网 (ER) Ca 循环而轻度抑制。从 E8.5 到 E10,第一心室组织和心房组织的传导速度从 0.2–1 mm/s 增加到 >5 mm/s,而其他区域仍然缓慢。心律失常包括由腺苷引起的房室折返。总之,在搏动开始时,If 依赖性起搏通过激活电压依赖性 Ca 通道来驱动 AP 传播和 Cai 瞬态生成。 Na 通道和细胞内 Ca 循环的作用较小。
To investigate cardiac physiology at the onset of heart beating in embryonic mouse hearts, we performed optical imaging of membrane potential (Vm) and/or intracellular calcium (Cai). Action potentials and Cai transients were detected in ~50% of mouse embryo hearts at E8.5, but in all hearts at E9.0, indicating that beating typically starts between E8–E9. Beating was eliminated by Ca channel blocker nifedipine and the If blocker ZD7288, unaffected by tetrodotoxin and only mildly depressed by disabling sarcoplasmic (SR) and endoplasmic (ER) reticulum Ca cycling. From E8.5 to E10, conduction velocity increased from 0.2–1 mm/s to >5 mm/s in first ventricular and then atrial tissue, while remaining slow in other areas. Arrhythmias included atrioventricular reentry induced by adenosine. In summary, at the onset of beating, If dependent pacemaking drives both AP propagation and Cai transient generation through activation of voltage-dependent Ca channels. Na channels and intracellular Ca cycling have minor roles.
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