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首页> 外文期刊>Biology Open >Royal jelly-like protein localization reveals differences in hypopharyngeal glands buildup and conserved expression pattern in brains of bumblebees and honeybees
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Royal jelly-like protein localization reveals differences in hypopharyngeal glands buildup and conserved expression pattern in brains of bumblebees and honeybees

机译：蜂王浆样蛋白的定位揭示了大黄蜂和蜜蜂脑下咽腺积聚和保守表达模式的差异

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摘要

Royal jelly proteins (MRJPs) of the honeybee bear several open questions. One of them is their expression in tissues other than the hypopharyngeal glands (HGs), the site of royal jelly production. The sole MRJP-like gene of the bumblebee, Bombus terrestris (BtRJPL), represents a pre-diversification stage of the MRJP gene evolution in bees. Here we investigate the expression of BtRJPL in the HGs and the brain of bumblebees. Comparison of the HGs of bumblebees and honeybees revealed striking differences in their morphology with respect to sex- and caste-specific appearance, number of cells per acinus, and filamentous actin (F-actin) rings. At the cellular level, we found a temporary F-actin-covered meshwork in the secretory cells, which suggests a role for actin in the biogenesis of the end apparatus in HGs. Using immunohistochemical localization, we show that BtRJPL is expressed in the bumblebee brain, predominantly in the Kenyon cells of the mushroom bodies, the site of sensory integration in insects, and in the optic lobes. Our data suggest that a dual gland-brain function preceded the multiplication of MRJPs in the honeybee lineage. In the course of the honeybee evolution, HGs dramatically changed their morphology in order to serve a food-producing function.
机译：蜜蜂的蜂王浆蛋白（MRJPs）有几个悬而未决的问题。其中之一是它们在蜂王浆产生部位下咽腺（HGs）以外的组织中的表达。大黄蜂的唯一MRJP样基因Bombus terrestris（BtRJPL）代表了蜜蜂MRJP基因进化的预多样化阶段。在这里，我们研究了BtRJPL在HG和大黄蜂大脑中的表达。比较大黄蜂和蜜蜂的HG，发现它们的形态在性别和种姓特定的外观，每个腺泡的细胞数和丝状肌动蛋白（F-肌动蛋白）环方面存在显着差异。在细胞水平上，我们在分泌细胞中发现了一个由F-肌动蛋白覆盖的临时网状结构，这表明肌动蛋白在HGs终末装置的生物发生中具有重要作用。使用免疫组织化学定位，我们显示BtRJPL在大黄蜂的大脑中表达，主要在蘑菇体的Kenyon细胞，昆虫的感官整合位点和视神经叶中表达。我们的数据表明，在蜜蜂谱系中，MRJPs的繁殖先于双重腺脑功能。在蜜蜂进化的过程中，HG显着改变了它们的形态，以发挥其食品生产功能。

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