Octopaminergic innervation and a neurohaemal release site in the antennal heart of the locust Schistocerca gregaria
Octopaminergic innervation and a neurohaemal release site in the antennal heart of the locust Schistocerca gregaria
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DOI：
10.1007/s00359-017-1213-5
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发表时间：
2018-02-01
影响因子：
2.1
通讯作者：
Pflueger, Hans-Joachim
中科院分区：
文献类型：
--
作者：
Antemann, Victoria;Pass, Guenther;Pflueger, Hans-Joachim
使用各种免疫组织化学方法详细说明了 Schistocerca gregaria 触角心脏的章鱼胺能神经支配。顺行轴突充盈说明通过成对的贲门神经 III 在触角心脏泵血肌的内侧腹侧表面上进行单侧神经支配。此外，抗体染色显示该神经的上升轴突终止于触角心脏的壶腹，形成突触结构和广泛的神经血液释放位点。由于两个背侧不成对的正中神经元的神经支配，首次通过免疫细胞化学在昆虫触角心脏中观察到生物胺章鱼胺和酪胺的存在。数据表明酪胺充当前体而不是纯粹作为独立递质。虽然支配触角心脏泵送肌的章鱼胺能纤维表明了心脏调节作用，但我们得出结论，从神经血管区域释放的章鱼胺被泵入触角，并讨论了触角感觉敏感性调节的参与。
A detailed account is given by the octopaminergic innervation of the antennal heart in Schistocerca gregaria using various immunohistochemical methods. Anterograde axonal filling illustrates the unilateral innervation on the medial ventral surface of the pumping muscle of the antennal heart via the paired corpora cardiaca nerve III. In addition, antibody staining revealed that ascending axons of this nerve terminate at the ampullae of the antennal heart forming synaptoid structures and extensive neurohaemal release sites. Due to the innervation by two dorsal unpaired median neurons, the presence of the biogenic amines octopamine and tyramine could be visualized by immunocytochemistry in an insect antennal heart for the first time. The data suggest that tyramine acts as a precursor and not purely as an independent transmitter. While the octopaminergic fibers innervating the pumping muscle of the antennal heart indicate a cardioregulatory role, we conclude that octopamine released from the neurohaemal area is pumped into the antennae and an involvement in the modulation of the antennal sensory sensitivity is discussed.