Abstract:
:Sympathetic innervation is critical for effective cardiac function. However, the developmental and regulatory mechanisms determining the density and patterning of cardiac sympathetic innervation remain unclear, as does the role of this innervation in arrhythmogenesis. Here we show that a neural chemorepellent, Sema3a, establishes cardiac sympathetic innervation patterning. Sema3a is abundantly expressed in the trabecular layer in early-stage embryos but is restricted to Purkinje fibers after birth, forming an epicardial-to-endocardial transmural sympathetic innervation patterning. Sema3a(-/-) mice lacked a cardiac sympathetic innervation gradient and exhibited stellate ganglia malformation, which led to marked sinus bradycardia due to sympathetic dysfunction. Cardiac-specific overexpression of Sema3a in transgenic mice (SemaTG) was associated with reduced sympathetic innervation and attenuation of the epicardial-to-endocardial innervation gradient. SemaTG mice demonstrated sudden death and susceptibility to ventricular tachycardia, due to catecholamine supersensitivity and prolongation of the action potential duration. We conclude that appropriate cardiac Sema3a expression is needed for sympathetic innervation patterning and is critical for heart rate control.
journal_name
Nat Medjournal_title
Nature medicineauthors
Ieda M,Kanazawa H,Kimura K,Hattori F,Ieda Y,Taniguchi M,Lee JK,Matsumura K,Tomita Y,Miyoshi S,Shimoda K,Makino S,Sano M,Kodama I,Ogawa S,Fukuda Kdoi
10.1038/nm1570subject
Has Abstractpub_date
2007-05-01 00:00:00pages
604-12issue
5eissn
1078-8956issn
1546-170Xpii
nm1570journal_volume
13pub_type
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