Serotonin-immunoreactive neurons in scorpion pectine neuropils: similarities to insect and crustacean primary olfactory centres?
Serotonin-immunoreactive neurons in scorpion pectine neuropils: similarities to insect and crustacean primary olfactory centres?
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蝎子果胶神经纤维中的血清素免疫反应性神经元：与昆虫和甲壳类动物初级嗅觉中心的相似之处？
DOI：
10.1016/j.zool.2011.10.002
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发表时间：
2012
期刊：
影响因子：
2
通讯作者：
Harzsch S
中科院分区：
文献类型：
--
作者：
Wolf H;Harzsch S
蝎子的果胶是位于最后面的一对行走腿后面的腹侧的一对机械和化学感官附属物。它们被用来探测猎物跟踪和求偶等行为中的底物。果胶上的感觉传入纤维为大的节段性神经髓提供了明显的肾小球结构。因此，果胶神经毛类似于昆虫和甲壳类动物与触角相关的中脑化学感觉中心，但它们也具有特殊的特征。许多昆虫和十足类甲壳类嗅觉神经鞘的一个特征是它们由单个或极少数大型5-羟色胺能(中间)神经元支配。在其他特征中，这一特征已被提出用于支持两个节肢动物组中嗅叶的同源性。蝎子果胶神经毛的5-羟色胺能神经支配的可能性尚未被研究，尽管它具有明显的诊断和功能重要性。因此，我们研究了澳洲仙人掌和熊猫的果胶神经毛中的5-羟色胺免疫反应性。这两种蝎子产生了类似的结果。神经束的外围和肾小球之间的基质由5-羟色胺免疫反应(5-HT-ir)树枝和静脉曲张组成的致密网络供应，而肾小球本身大多没有5-HT-ir纤维。5-羟色胺-IR的供应有两个来源。第一个是身体两侧的一对神经元，直径可达30μm，因此略大于周围的体细胞。这些细胞体与生殖器和果胶节段的神经丝联系在一起。这种情况让人想起昆虫和甲壳类动物嗅觉和触角神经毛的5-羟色胺供应。第二个5-羟色胺的5-羟色胺神经支配来自10-20个稍小(15-20μm)的同侧神经元胞体。这些是一个更大的5-羟色胺-IR组的一部分，该组由70-90个体节组成。整个组位于比上述单个胞体更靠前的位置，并与最后(第4)行走腿的神经节联系在一起。与其他节肢动物的数据相比，我们的发现可能表明，肾小球组织是由节肢动物附件支配的初级化学感觉中心的祖先特征。这一想法需要进一步的审查，尽管支持证据之前可能被忽略了，因为行走的腿和减少的节段性附件中的化学感觉神经毛很小。
The pectines of scorpions are a single pair of mechano- and chemosensory appendages located ventrally behind the most posterior pair of walking legs. They are used for probing the substrate in behaviours such as prey tracking and courtship. The sensory afferents on the pectines supply large segmental neuropils with a conspicuous glomerular structure. The pectine neuropils thus bear similarities to insect and crustacean deutocerebral chemosensory centres associated with the antennae, but they also possess idiosyncratic features. One characteristic property of many insect and decapod crustacean olfactory neuropils is their innervation by single, or very few, large serotonergic (inter-) neurons. This feature, among others, has been proposed to support homology of the olfactory lobes in the two arthropod groups. A possible serotonergic innervation of the scorpion pectine neuropils has not yet been studied, despite its apparent diagnostic and functional importance. We thus examined serotonin-immunoreactivity in the pectine neuropils of Androctonus australis and Pandinus imperator. Both scorpion species yielded similar results. The periphery of the neuropil and the matrix between the glomeruli are supplied by a dense network of serotonin-immunoreactive (5-HT-ir) arborisations and varicosities, while the glomeruli themselves are mostly free of 5-HT-ir fibres. The 5-HT-ir supply of the pectine neuropils has two origins. The first is a pair of neurons on each body side, up to 30μm in diameter and thus slightly larger than the surrounding somata. These cell bodies are and associated with the neuromeres of the genital and pectine segments. The situation is reminiscent of the 5-HT supply of insect and crustacean olfactory and antennal neuropils. The second 5-HT innervation of the pectine neuropils is from a group of some 10–20 ipsilateral neuronal somata of slightly smaller size (15–20μm). These are part of a much larger 5-HT-ir group comprising 70–90 somata. The whole group is located more anteriorly than the single soma mentioned above, and associated with the neuromere of the last (4th) walking leg. When compared to data from other arthropods, our findings may suggest that glomerular organisation is an ancestral feature of primary chemosensory centres innervated by arthropod appendages. This idea needs further scrutiny, although supporting evidence may have been overlooked previously, due to the small size of chemosensory neuropils in walking legs and in reduced segmental appendages.
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影响因子：
64.8
作者：
ROMER, H
通讯作者：
ROMER, H
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影响因子：
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作者：
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通讯作者：
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作者：
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作者：
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影响因子：
3.6
作者：
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通讯作者：
K. Johansson