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[Electron microscopic and electron histochemical study of mitochondrial inclusions in insect intestine epithelial
Abstract:
The electron microscope investigation of the midgut epithelial cells of Chaoborus obscuripes revealed special membrane formations in mitochondria. The mitochondrial inclusions (MI) look like small membranous whorls about 0.2--0.3 microns in diameter. In a certain period of functional activity, MI start leaving the mitochondria and appear in cytoplasm. Later, large multimembrane structures (MS) composed of parallel membranes in concentric or whorl--like arrangement are observed in the cytoplasm. At first MS are situated in the vicinity of mitochondria, then they gather near the base of the villus. The relationship between appearance of MI and MS in the cytoplasm and the digestion process was revealed. Treatment of ultrathin sections with H202 or H5J06 showed MI and MS to be composed mainly of lipids. This suggests that MI and MS,probably, take part in the lipids metabolism of the midgut epithelial cells of insect.
Insights
Special membrane formations, mitochondrial inclusions (MI), and multimembrane structures (MS) were observed in insect midgut cells. These structures, likely involved in lipid metabolism, originate from mitochondria during digestion.
Area of Science:
- Cell Biology
- Insect Physiology
- Lipid Metabolism
Context:
- Electron microscopy of Chaoborus obscuripes midgut epithelial cells.
- Observation of unique mitochondrial inclusions (MI) and subsequent formation of multimembrane structures (MS) in the cytoplasm.
Purpose:
- To investigate the nature and function of novel membrane formations within insect midgut epithelial cells.
- To determine the composition and potential role of mitochondrial inclusions and multimembrane structures in cellular processes.
Summary:
- Mitochondrial inclusions (MI), appearing as small membranous whorls, were observed to exit mitochondria and form larger multimembrane structures (MS) in the cytoplasm.
- These MI and MS accumulate near the base of villi and their appearance correlates with the digestion process.
- Chemical treatments indicated that MI and MS are primarily composed of lipids, suggesting a role in lipid metabolism.
Impact:
- Provides insight into the dynamic membrane structures within insect midgut cells.
- Suggests a novel mechanism for lipid handling and metabolism in these organisms.
- Highlights the specialized adaptations of insect digestive systems at the ultrastructural level.