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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Observations on the settlement and cementation of barnacle (Balanus amphitrite) cyprid larvae after artificial exposure to noradrenaline and the locations of adrenergic-like receptors
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Observations on the settlement and cementation of barnacle (Balanus amphitrite) cyprid larvae after artificial exposure to noradrenaline and the locations of adrenergic-like receptors

机译：人工暴露于去甲肾上腺素后藤壶（Balanus amphitrite）塞浦路斯幼虫的沉降和胶结作用的观察和肾上腺素样受体的位置

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Exploration of substrata prior to cementation and metamorphosis is a critical step in the life cycle of Cirri-pedes. To this end, barnacle cyprid larvae have evolved sophisticated sensory mechanisms to investigate chemical as well as topographical composition of the substratum. Since barnacles are major biofoulers, the sensory structures of Balanus amphitrite cyprids have been described in detail using ultrastructural techniques like SEM and TEM. Settlement assays have shown that cyprid settlement is deterred by adrenergic receptor agonists and antagonists, yet the exact location of these receptors on cyprid sensory structures is unknown. Here, using a fluorescent adrenergic receptor antagonist (Bodipy FL-Prazosin) with the aid of con-focal microscopy we describe the putative locations of adrenergic-like receptors in B. amphitrite cyprids. Our results indicate that postaxial setae 2 and 3 of the 2nd and 3rd segments respectively, the sub-terminal setae of the 4th antennular segment and the cement gland secretory cells seem to bear the adrenergic-like receptors. Using optical and electron microscopy we further studied the effects of noradrenaline (NA), an adrenergic receptor agonist, on cyprid settlement and metamorphosis. NA treated cyprids forgo the typical settlement behavior and metamorphose into juvenile barnacles without cementing to the substratum. Cyprid-barnade metamorphosis in NA treated cyprids is also prolonged as compared to untreated barnacles. The key role played by adrenergic-like receptors during surface sensing, cementation and metamorphosis is discussed.
机译：在胶结和变质之前探索地下是Cirri-pedes生命周期中的关键步骤。为此，藤壶塞浦路斯幼虫已经进化出复杂的感官机制，以研究基质的化学成分以及地形成分。由于藤壶是主要的生物污垢物，已使用超微结构技术（如SEM和TEM）详细描述了Balanus amphitrite cyprids的感官结构。沉降测定法表明，肾上腺素受体激动剂和拮抗剂阻止了塞浦路斯的沉降，但是这些受体在塞浦路斯的感觉结构上的确切位置尚不清楚。在这里，使用荧光肾上腺素能受体拮抗剂（Bodipy FL-Prazosin）在共聚焦显微镜的帮助下，我们描述了肾上腺双能杆菌cyprids中肾上腺素能受体的假定位置。我们的结果表明，第二和第三节段的后轴刚毛2和3，第四小节段的亚末端刚毛节和水泥腺分泌细胞似乎带有肾上腺素样受体。使用光学和电子显微镜，我们进一步研究了肾上腺素受体激动剂去甲肾上腺素（NA）对赛普拉斯沉降和变态的影响。 NA处理的塞浦路斯人放弃了典型的定居行为，并转变为幼年藤壶，而不会固结在基质上。与未处理的藤壶相比，NA处理的鲤鱼中的Cyrard-barnade变态也延长了。讨论了肾上腺素样受体在表面感测，胶结和变态过程中的关键作用。

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