急性实验条件下虹鳟鱼视前核的自发多单位活动及血压变化

Spontaneous multiple unit activity from the preoptic nucleus and changes in blood pressure in the rainbow trout Salmo gairdneri under acute experimental conditions.

作者信息

Le Mevel J C, Mabin D

出版信息

Comp Biochem Physiol A Comp Physiol. 1985;81(2):311-8. doi: 10.1016/0300-9629(85)90140-9.

Abstract

Multiple unit activity (MUA) from the preoptic nucleus (NPO) blood pressure and heart rate were recorded in 41 anaesthetized and curarized rainbow trout. Mayer waves were frequently observed in blood pressure recordings (83%). Rhythmic MUA from the NPO, recorded in 46% of the experimented trout, occurred preferentially during Mayer waves. The initiation of the period of MUA occurred during low pressure vasomotor tone and large vasomotor pulse pressure inhibited MUA. Sustained decrease in blood pressure induced proportional rise in MUA. These results suggest that cardiovascular inputs influence the electrical activity of neurosecretory cells within the NPO and so may modulate the neurohypophysial hormones secretion.

摘要

在41条麻醉并箭毒化的虹鳟鱼中记录了视前核（NPO）的多单位活动（MUA）、血压和心率。在血压记录中经常观察到迈尔氏波（83%）。在46%的实验虹鳟鱼中记录到的来自NPO的节律性MUA，优先出现在迈尔氏波期间。MUA期的起始发生在低压血管运动张力期间，而大的血管运动脉压抑制MUA。血压持续下降导致MUA成比例上升。这些结果表明，心血管输入影响NPO内神经分泌细胞的电活动，因此可能调节神经垂体激素的分泌。