Insect repellents: modulators of mosquito odorant receptor activity.

Insect repellents: modulators of mosquito odorant receptor activity.
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DOI:
10.1371/journal.pone.0012138
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发表时间:
2010-08-11
期刊:
影响因子:
3.7
通讯作者:
Dickens JC
Dickens JC
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bohbot JD;Dickens JC

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DEET、2-十一酮(2-U)、IR3535和Picaridin被广泛用作驱虫剂,以防止人类与包括蚊子在内的许多节肢动物之间的相互作用。它们的分子作用直到最近才被研究,产生了似乎相互矛盾的理论,包括对昆虫嗅觉感觉神经元(OSNs)和气味受体蛋白(ORs)的气味依赖性抑制和气味非依赖性兴奋活性。在这里,我们描述了这些驱避剂对两个埃及伊蚊ORs的作用,AaOR2和AaOR8,分别与共同的共同受体AaOR7在非洲爪哇卵母细胞中共同表达;这些ORs分别被气味吲哚(AaOR2)和(R)-(−)-1-辛烯-3-醇(AaOR8)激活,这两种气味用于定位产卵地点和宿主动物。在没有气味的情况下,DEET激活AaOR2但不激活AaOR8,而2-U激活AaOR8但不激活AaOR2;IR3535和Picaridin不激活这些OR。有气味时,DEET强烈抑制AaOR8,但不抑制AaOR2;2-U强烈抑制AaOR2,但不抑制AaOR8;IR3535和Picaridin强烈抑制这两种ORs。这些数据表明,驱避剂可以作为嗅觉激动剂或拮抗剂,从而调节OR活动,使相互冲突的模型保持一致。
DEET, 2-undecanone (2-U), IR3535 and Picaridin are widely used as insect repellents to prevent interactions between humans and many arthropods including mosquitoes. Their molecular action has only recently been studied, yielding seemingly contradictory theories including odorant-dependent inhibitory and odorant-independent excitatory activities on insect olfactory sensory neurons (OSNs) and odorant receptor proteins (ORs). Here we characterize the action of these repellents on two Aedes aegypti ORs, AaOR2 and AaOR8, individually co-expressed with the common co-receptor AaOR7 in Xenopus oocytes; these ORs are respectively activated by the odors indole (AaOR2) and (R)-(−)-1-octen3-ol (AaOR8), odorants used to locate oviposition sites and host animals. In the absence of odorants, DEET activates AaOR2 but not AaOR8, while 2-U activates AaOR8 but not AaOR2; IR3535 and Picaridin do not activate these ORs. In the presence of odors, DEET strongly inhibits AaOR8 but not AaOR2, while 2-U strongly inhibits AaOR2 but not AaOR8; IR3535 and Picaridin strongly inhibit both ORs. These data demonstrate that repellents can act as olfactory agonists or antagonists, thus modulating OR activity, bringing concordance to conflicting models.
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