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Membrane translocation of small GTPase Rac1 and activation of STAT1 and STAT3 in pacing-induced sustained atrial fibrillation.

Heart Rhythm. 2008 Sep;5(9):1285-93. Epub 2008 May 16
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摘要


BACKGROUND:Angiotensin II and its downstream mitogen-activated protein kinase signaling pathways are involved in the pathogenesis of AF. Pro-inflammatory is another downstream signaling pathway of Angiotensin II, and its status in AF remains unknown. OBJECTIVE:The aim of this study was to characterize the status of the Janus kinase/signal transducers and activators of transcription pathways in pacing-induced sustained atrial fibrillation (AF). METHODS:AF was induced by atrial pacing at 600/min in 10 adult pigs (AF group), while 10 sham-operated pigs served as the control group. RESULTS:Significant structural and inflammatory changes were noted in the AF group. Atrial tissue angiotensin II level was elevated and and were activated in the AF group. Nuclear translocation of activated duanyu18133 and binding to duanyu18133 consensus DNA sequence were also increased in the AF group. Rac1, the molecular target of statin, which mediates the activation of duanyu18133 by angiotensin II, was also activated in the AF group. The tissue levels of interleukin-6, leukemia inhibitory factor (LIF) and cardiotrophin-1 (CT-1), which are known to activate through membrane gp130 and JAKs, were not increased in the AF group. Membrane gp130 and JAKs were also not activated in the AF group. CONCLUSION:Activated angiotensin may be associated with or perhaps contribute to the structural and inflammatory changes in pacing-induced sustained trial fibrillation. It may further imply the therapeutic option of combination of angiotensin receptor blocker and statin.

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