Replacement of midgut epithelium in the greater wax moth, Galleria mellonela, during larval-pupal moult

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• 作者：Makiko F. Uwo ; Kumiko Ui-Tei ; Pyoyun Park and Makio Takeda
• 刊名：Cell and Tissue Research
• 出版年：2002
• 出版时间：May 2002
• 年：2002
• 卷：308
• 期：2
• 页码：319-331
• 全文大小：1,404 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Human Genetics
  Proteomics
  Molecular Medicine
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0878

文摘

The epithelium of larval midgut of the greater wax moth, Galleria mellonela, was replaced during the larval-pupal moult. The development of this moth was tentatively divided into 11 stages, from the full-grown larva of last instar to the 4-day-old pupa. The midgut at each stage was observed for (1) overall structure, (2) the position of goblet cells, and (3) the appearance of the yellow body. Light microscopy revealed that cell death in the midgut began in a cocoon-spinning larva (stage II), when pigments in the stemmata started to migrate. Before drastic remodeling started to occur, cytoplasmic projections in the goblet cavities were transformed. The larval midgut changed markedly at stage III, when the pigments left the stemmata. The epithelium of the larval midgut dropped as a whole into the lumen, transforming into the yellow body. Simultaneously, a pupal midgut epithelium developed. Electron microscopy of the columnar cells of a stage III larva showed that microvilli and mitochondria looked normal even though the nucleus with condensed heterochromatin resembled an apoptotic nucleus of vertebrate and higher plant cells. Caspase-3-like protease activity was restricted to the larval midgut and increased in parallel with the formation of the yellow body. The results indicate that the replacement of the larval midgut is facilitated by a typical apoptotic process.