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Developmental changes in localization of the main ganglioside during sea urchin embryogenesis
Developmental changes in localization of the main ganglioside during sea urchin embryogenesis
- Source :
- Glycobiology. 10(11)
- Publication Year :
- 2000
-
Abstract
- Ganglioside M5 (NeuGcalpha2-6Glcbeta1-1'Cer), the main ganglioside in sea urchin and sand dollar eggs, exists mainly in the endoplasmic reticulum and yolk granules in unfertilized eggs. To study the localization of ganglioside M5 after fertilization, early embryos were stained with an anti-ganglioside M5 monoclonal antibody. Using immunofluorescent and immunoelectron microscopy, intense label was observed in the outer surface and cytoplasm of embryos. These results indicate that ganglioside M5 was secreted during embryogenesis and localized in the extracellular matrix (ECM). When living embryos were incubated in sea water containing 7-nitrobenz-2-oxa-1,3-diazole labeled-ganglioside M5 (NBD-M5), the ECM and plasma membrane were strongly stained. Since the localization of NBD-M5 in the ECM was similar to that of extracellular M5, NBD-M5 was likely to be useful to examine the fate of extracellular ganglioside M5. Interestingly, NBD-M5 was incorporated in subcortical vesicles during embryogenesis, suggesting that the extracellular ganglioside M5 is transported into the cytoplasm. When fertilized eggs were incubated with NBD-M5 and tetramethylrhodamine dextran (a marker dye for endocytotic vesicles), colocalization of the dyes was observed in the vesicles. Thus, it was concluded that NBD-M5 in the ECM and/or plasma membrane was internalized in the cells by endocytosis, suggesting that extracellular M5 is transported from the ECM to endocytotic vesicles.
- Subjects :
- Ganglioside
Microscopy, Confocal
Vesicle
Immunoelectron microscopy
Endoplasmic reticulum
Cell Membrane
Biological Transport, Active
Biology
Biochemistry
Endocytosis
Cell biology
Extracellular Matrix
Extracellular matrix
Cytoplasm
biology.animal
Gangliosides
Sea Urchins
Extracellular
Animals
lipids (amino acids, peptides, and proteins)
Sea urchin
Fluorescent Dyes
Subjects
Details
- ISSN :
- 09596658
- Volume :
- 10
- Issue :
- 11
- Database :
- OpenAIRE
- Journal :
- Glycobiology
- Accession number :
- edsair.doi.dedup.....45699cabedccbcee5a519a135bd5e0fd