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Localization of glycosaminoglycans in the ovarioles of the colorado potato beetle leptinotarsa decemlineata say


Localization of glycosaminoglycans in the ovarioles of the colorado potato beetle leptinotarsa decemlineata say



Annales de la Societe Royale Zoologique de Belgique 116(2): 131-136



The distribution of glycosaminoglycans in the follicles of the ovaries of Leptinotarsa decemlineata was investigated with the alcian blue staining technique. The ovariole wall and the intracellular space between follicle cells and oocyte are alcian blue positive throughout the development of the follicle. The follicle cells are weakly stained in previtellogenic follicles, unstained when vitellogenesis is proceeding and contain intensely blue secretory vesicles, probably chorionic material, at the end yolk formation. Neither the ooplasm nor the yolk bodies are able to bind the dye. Biochemical analysis of ovary extracts reveal the presence of uronic acids and N-sulphates, which are both important glycosaminoglycan constitutents. The occurrence of glycosaminoglycans in the intercellular space between the follicular epithelium and the oocyte and the affinity of the vitellogenic proteins for polyanionic polysaccharides suggest that glycosaminoglycans possibly act as a binding agent for vitellogenic proteins.

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