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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >First immunocytochemical study of echinoderm smooth muscle: the Antarctic cushionstar Odontaster validus Koehler (Echinodermata, Asteroidea)
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First immunocytochemical study of echinoderm smooth muscle: the Antarctic cushionstar Odontaster validus Koehler (Echinodermata, Asteroidea)

机译：棘皮动物平滑肌的第一个免疫细胞化学研究：南极垫星Odontaster validateus Koehler（棘皮动物，小行星）

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Our immunocytochemical observations reveal that the muscle present in the tips of the arms of the Antarctic cushionstar Odontaster validus contains caldesmon and calponin but not troponin. Thus, the muscle clearly belongs to the smooth muscle category. Distributions of contractile proteins such as actin, myosin (the latter a typical vertebrate muscle filament protein), paramyosin, and miniparamyosin (the latter two being characteristic of thick invertebrate muscle filaments) were also determined immunocytochemically. The results suggest that the thin filaments of the starfish smooth muscle are similar to those of the vertebrate muscle, but that the thick filaments differ from those of vertebrates and possess traits that are also seen in the muscle organization of invertebrates. The absence from the O. validus muscle of titin and nebulin, proteins so far known almost exclusively from the striated vertebrate muscle, comes as no surprise, but immunoreactivity to mini-titin (a protein of the same family as titin and its replacement in invertebrates) was strong and unambiguously recognizable between filaments. Odontaster validus' histochemical characteristics may be a reflection of the phylogenetic position of the echinoderms as deuterostome invertebrates or they may express an adaptation of the muscle to the harsh environmental conditions under which it has to function in the Antarctic water. [References: 33]
机译：我们的免疫细胞化学观察结果表明，南极垫星Odontaster Validus臂尖上的肌肉中含有Caldesmon和Calponin，但不含肌钙蛋白。因此，肌肉显然属于平滑肌类别。还通过免疫细胞化学方法测定了收缩蛋白的分布，例如肌动蛋白，肌球蛋白（后者是典型的脊椎动物肌肉细丝蛋白），副肌球蛋白和小副肌球蛋白（后两种是厚的无脊椎动物肌细丝的特征）。结果表明，海星平滑肌的细细丝与脊椎动物的细丝相似，但是粗细的细丝与脊椎动物的细丝不同，并且具有在无脊椎动物的肌肉组织中也可见到的特征。迄今为止，几乎没有人只知道横纹脊椎动物肌肉中存在的效蛋白O和有效蛋白O，而不是有效蛋白，但它对小蛋白（一种与蛋白相同家族的蛋白，在无脊椎动物中的替代蛋白）具有免疫反应性。 ）牢固且在细丝之间清晰可辨。齿牙don的组织化学特征可能反映了棘皮动物的氘皮无脊椎动物的系统发育位置，或者它们可能表达了肌肉适应必须在南极水中起作用的恶劣环境条件。 [参考：33]

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