Department of Plant Protection Biology, Unit of Chemical Ecology, Swedish University of Agricultural Sciences, Box 102, 230 53, Alnarp, Sweden,
Cell Tissue Res. 2013 Nov;354(2):431-40. doi: 10.1007/s00441-013-1703-x. Epub 2013 Aug 18.
Olfaction is an important sensory modality that regulates a plethora of behavioural expressions in insects. Processing of olfactory information takes place in the primary olfactory centres of the brain, namely the antennal lobes (ALs). Neuropeptides have been shown to be present in the olfactory system of various insect species. In the present study, we analyse the distribution of tachykinin, FMRFamide-related peptides, allatotropin, allatostatin, myoinhibitory peptides and SIFamide in the AL of the male Egyptian cotton leafworm, Spodoptera littoralis. Immunocytochemical analyses revealed that most neuropeptides were expressed in different subpopulations of AL neurons. Their arborisation patterns within the AL suggest a significant role of neuropeptide signalling in the modulation of AL processing. In addition to local interneurons, our analysis also revealed a diversity of extrinsic peptidergic neurons that connected the antennal lobe with other brain centres. Their distributions suggest that extrinsic neurons perform various types of context-related modulation.
嗅觉是一种重要的感觉模态，它调节着昆虫的多种行为表达。嗅觉信息的处理发生在大脑的主要嗅觉中心，即触角叶（ALs）。已经表明，神经肽存在于各种昆虫物种的嗅觉系统中。在本研究中，我们分析了埃及棉铃虫雄虫触角叶中速激肽、FMRF 酰胺相关肽、促前胸腺激素、前胸腺抑制素、肌抑制肽和 SIFamide 的分布。免疫细胞化学分析表明，大多数神经肽在 AL 神经元的不同亚群中表达。它们在 AL 内的分支模式表明神经肽信号在调节 AL 处理中具有重要作用。除了局部中间神经元外，我们的分析还揭示了多种与其他脑中心相连的外在肽能神经元。它们的分布表明，外在神经元执行各种类型的与上下文相关的调制。
