期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2019
卷号：116
期号：40
页码：20201-20209
DOI：10.1073/pnas.1902444116
出版社：The National Academy of Sciences of the United States of America
摘要：Action potential-induced vesicular exocytosis is considered exclusively Ca 2+ dependent in Katz’s Ca 2+ hypothesis on synaptic transmission. This long-standing concept gets an exception following the discovery of Ca 2+ -independent but voltage-dependent secretion (CiVDS) and its molecular mechanisms in dorsal root ganglion sensory neurons. However, whether CiVDS presents only in sensory cells remains elusive. Here, by combining multiple independent recordings, we report that [1] CiVDS robustly presents in the sympathetic nervous system, including sympathetic superior cervical ganglion neurons and slice adrenal chromaffin cells, [2] uses voltage sensors of Ca 2+ channels (N-type and novel L-type), and [3] contributes to catecholamine release in both homeostatic and fight-or-flight like states; [4] CiVDS-mediated catecholamine release is faster than that of Ca 2+ -dependent secretion at the quantal level and [5] increases Ca 2+ currents and contractility of cardiac myocytes. Together, CiVDS presents in the sympathetic nervous system with potential physiological functions, including cardiac muscle contractility..
关键词：CiVDS ; sympathetic neurons ; N;type and L;type Ca 2+ channels ; chromaffin cells ; catecholamine
