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首页> 外文期刊>Cell and Tissue Research >The midgut of the silkmoth Bombyx mori is able to recycle molecules derived from degeneration of the larval midgut epithelium
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The midgut of the silkmoth Bombyx mori is able to recycle molecules derived from degeneration of the larval midgut epithelium

机译：家蚕Bombyx mori的中肠能够回收衍生自幼体中肠上皮变性的分子

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摘要

The midgut represents the middle part of the alimentary canal and is responsible for nutrient digestion and absorption in insect larva. Despite the growing interest in this organ for different purposes, such as studies on morphogenesis and differentiation, stem cell biology, cell death processes and transport mechanisms, basic information on midgut development is still lacking for a large proportion of insect species. Undoubtedly, this lack of data could hinder the full exploitation of practical applications that involve midgut as their primary target. This may represent in particular a significant problem for Lepidoptera, an insect order that includes some of the most important species of high economic importance. With the aim of overcoming this fragmentation of knowledge, we performed a detailed morphofunctional analysis of the midgut of the silkworm, Bombyx mori, a representative model among Lepidoptera, during its development from the larval up to the adult stage, focusing attention on stem cells. Our data demonstrate stem cell proliferation and differentiation, not only in the larval midgut but also in the pupal and adult midgut epithelium. Moreover, we present evidence for a complex trophic relationship between the dying larval epithelium and the new adult one, which is established during metamorphosis. This study, besides representing the first morphological and functional characterization of the changes that occur in the midgut of a lepidopteron during the transition from the larva to the moth, provides a detailed analysis of the midgut of the adult insect, a stage that has been neglected up to now.
机译：中肠代表消化道的中部，负责昆虫幼虫的营养消化和吸收。尽管人们出于不同目的对该器官的兴趣日益增长，例如关于形态发生和分化，干细胞生物学，细胞死亡过程和转运机制的研究，但对于大部分昆虫而言，仍缺乏中肠发育的基本信息。毫无疑问，数据的缺乏可能会阻碍以中肠为主要目标的实际应用的充分利用。对于鳞翅目而言，这尤其可能是一个重大问题，鳞翅目是一种昆虫纲，其中包括一些具有重要经济意义的最重要物种。为了克服这种知识分裂的情况，我们对家蚕的中肠，鳞翅目的代表模型，从鳞翅目幼虫到成年期进行了详细的形态功能分析，重点是干细胞。我们的数据表明，干细胞的增殖和分化不仅在幼虫中肠，而且在up和成年中肠上皮中也是如此。此外，我们提供了即将死亡的幼虫上皮与变态期间建立的新成年上皮之间复杂的营养关系的证据。这项研究除了代表了从幼虫到蛾的过渡过程中鳞翅目中肠发生的变化的第一个形态和功能特征外，还对成虫的中肠进行了详细的分析，这一阶段已被忽略。到现在。

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