CONTROL OF FOREGUT CONTRACTION IN THE BLACK FIELD CRICKET, TELEOGRYLLUS-COMMODUS WALKER (GRYLLIDAE, ORTHOPTERA)
CONTROL OF FOREGUT CONTRACTION IN THE BLACK FIELD CRICKET, TELEOGRYLLUS-COMMODUS WALKER (GRYLLIDAE, ORTHOPTERA)
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DOI：
10.1016/0022-1910(94)90120-1
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发表时间：
1994-06-01
影响因子：
2.2
通讯作者：
HE, PH
中科院分区：
文献类型：
--
作者：
COOPER, PD;HE, PH
很少有信息是关于神经和/或体液控制的前肠寄生虫与喂养昆虫。本文以长嘴油葫芦（Teleogryllus commodus步行者）为实验材料，研究了摄食和化学物质（proctolin和5-HT）对离体前肠收缩的影响。饮食和作物中存在的食物都会影响收缩的模式。在1 pmol l（-1）和1 μ mol l（-1）之间，Proctolin和5-HT以剂量依赖性方式增加收缩。比较10 nmol l（-1）和1 μ mol l（-1）的proctolin和1 μ mol l（-1）的5-HT的作用，发现5-HT的刺激作用最强。这两种化学物质之间的差异是由于5-HT对作物生长的刺激作用。肠收缩继续升高后，用生理盐水替代5-HT，虽然这种残余影响减少时，ingluvial神经节被删除。当前肠保持与中肠/后肠连接时，观察到前肠的自发收缩活动增加。将分离的中肠加入到盐水中浸泡前肠导致10 s内收缩模式的变化。这项工作表明，来自中肠的反馈和从中枢或口胃神经系统释放的化学物质影响前肠收缩。
Very little information is available regarding the nervous and/or humoral control of foregut peristalsis associated with feeding in insects. Using the cricket, Teleogryllus commodus Walker, we have examined the effect of feeding and the chemicals, proctolin and 5-hydroxytryptamine (5-HT), on contraction of isolated foreguts. Both diet and the presence of food in the crop influence the pattern of contraction. Proctolin and 5-HT increase contraction in a dose-dependent manner between 1 pmol l(-1) and 1 mu mol l(-1). Comparison of the effects of proctolin (10 nmol l(-1) and 1 mu mol l(-1)) and 5-HT (1 mu mol l(-1)) indicated that 5-HT always had the greatest stimulatory effect. The difference between the two chemicals resulted from stimulation of crop peristalsis by 5-HT. Gut contractions continued to be elevated after replacement of 5-HT by normal saline, although this residual effect was reduced when the ingluvial ganglia were removed. An increase in spontaneous contractile activity of the foregut was observed when the foregut remained connected to the midgut/hindgut. Addition of the isolated midgut to the saline bathing the foregut resulted in changes in the contraction pattern within 10 s. This work indicates that feedback from the midgut and chemicals released either from the central or stomatogastric nervous systems influence foregut contraction.