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Innervation of holothurian body wall muscle: Inhibitory effects and localization of 5-HT

机译:整形人的全身肌肉的抑制作用:5-HT的抑制作用和定位

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We investigated innervation to body wall muscles as well as distribution of 5-HT (serotonin) and its effects on longitudinal muscles of body wall (LMBW) of the sea cucumber Apostichopus japonicus. With serial sections we found neural branches and fibers extending from hyponeural part of radial nerve towards LMBW and circular muscles of body wall. With the aqueous aldehyde (Faglu) method yellow fluorescence indicating indolamines was observed in LMBW and in the mesentery connecting LMBW to the body wall. With indirect immunohistochemistry 5-HT-like immunoreactivity was observed in LMBW and in mesentery. These results strongly suggested that both LMBW and mesentery contained 5-HT. The effects of monoamine neurotransmitters were studied in LMBW. Putative neurotransmitters tested were 5-HT, adrenaline, noradrenaline, dopamine, and DOPA at the concentration of 10(-6) M. The application of 5-HT caused no contraction or relaxation, but it inhibited the contraction induced by 10(-6)-10(-5) M acetylcholine (ACh). Catecholamines were ineffective by themselves and had no effects on the contraction induced by ACh. The present histological, histochemical, and pharmacological studies strongly suggested that holothurian LMBW was innervated by inhibitory serotonergic neurons of the hyponeural nervous system.
机译:我们研究了神经刺入体壁肌肉以及5-HT(5-羟色胺)的分布及其对海参刺参体壁纵向肌肉(LMBW)的影响。通过连续的切片,我们发现神经分支和纤维从radial神经的下神经部分向LMBW和体壁的环形肌肉延伸。使用水性醛(Faglu)方法时,在LMBW和将LMBW连接至体壁的肠系膜中观察到黄色荧光,表明存在吲哚胺。通过间接免疫组织化学,在LMBW和肠系膜中观察到5-HT样免疫反应性。这些结果强烈表明LMBW和肠系膜均含有5-HT。在LMBW中研究了单胺神经递质的作用。推定的神经递质为5-HT,肾上腺素,去甲肾上腺素,多巴胺和DOPA,浓度为10(-6)M。5-HT的使用不会引起收缩或松弛,但会抑制10(-6)诱导的收缩。 )-10(-5)M乙酰胆碱(ACh)。儿茶酚胺本身无效,对乙酰胆碱引起的收缩没有影响。当前的组织学,组织化学和药理学研究强烈表明,全人参LMBW受下神经系统抑制性血清素能神经元的支配。

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