首页> 外文期刊>American Journal of Physiology >Physiological role of neuropeptide Y in the regulation of the ascending phase of the peristaltic reflex.
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Physiological role of neuropeptide Y in the regulation of the ascending phase of the peristaltic reflex.

机译:神经肽Y在蠕动反射上升阶段的调节中的生理作用。

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摘要

The physiological role of neuropeptide Y (NPY) and of specific NPY receptors in regulating the intestinal peristaltic reflex was examined in three-compartment flat-sheet preparations of rat colon. Graded muscle stretch or mucosal stimulation applied to the central compartment inhibited NPY release in the orad compartment where ascending contraction was measured. NPY and the Y1-receptor agonist [Leu31, Pro34]NPY inhibited, whereas the selective Y1-receptor antagonist BIBP 3226 augmented ascending contraction and substance P (SP) release in the orad compartment induced by muscle stretch or mucosal stimulation. Neither agonist nor antagonist had any effect on descending relaxation or VIP release in the caudad compartment. The Y2-receptor agonist NPY13-36 and antagonist BIIE 0246 had no effect on peptide release or mechanical response. The results indicate that suppression of a tonic inhibitory influence of NPY neurons on excitatory neurotransmitter release contributes substantially to the orad contractilephase of the peristaltic reflex. The effect of NPY on neurotransmitter release is mediated by Y1 receptors.
机译:在大鼠肠三室平板制剂中检查了神经肽Y(NPY)和特定NPY受体在调节肠蠕动反射中的生理作用。梯度肌肉拉伸或粘膜刺激应用于中央隔室可抑制oraY隔室中NPY的释放,在该区域中可测量上升收缩。 NPY和Y1受体激动剂[Leu31,Pro34] NPY受到抑制,而选择性Y1受体拮抗剂BIBP 3226则增加了肌肉拉伸或粘膜刺激诱导的在仓室中的上升收缩和P物质(SP)释放。激动剂和拮抗剂都没有对降息室中的下降松弛或VIP释放产生任何影响。 Y 2受体激动剂NPY13-36和拮抗剂BIIE 0246对肽释放或机械反应没有影响。结果表明,抑制NPY神经元对兴奋性神经递质释放的强直抑制作用,实质上有助于蠕动反射的orad收缩期。 NPY对神经递质释放的影响由Y1受体介导。

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