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Updated: May 12, 2026
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The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions
Published on: February 16, 2017
A role for polyglucans in a model sea urchin embryo cellular interaction
Suprita Singh1, Eddie Karabidian1, Alexander Kandel1
1Center for Cancer and Developmental Biology,California State University,18111 Nordhoff Street,Northridge,California 91330-8303,USA.
Zygote (Cambridge, England)
|March 29, 2013
Summary
This study directly implicates polyglucans with specific glucose residues in sea urchin embryo cell adhesion, a process crucial for development. Beta-amylase enzyme activity was key in inhibiting this interaction.
Area of Science:
- Developmental Biology
- Biochemistry
- Cellular Adhesion
Background:
- The interaction between the archenteron tip and blastocoel roof in sea urchin embryos is a long-studied model for cellular interactions.
- Glycans have been indirectly implicated in mediating this critical developmental adhesion event.
Purpose of the Study:
- To directly investigate the role of glycans in mediating the adhesion between the archenteron tip and blastocoel roof in Lytechinus pictus embryos.
- To identify specific glycosidases that can inhibit this cellular interaction.
Main Methods:
- Commercial glycosidases were tested for enzymatic activity using direct chemical assays and sea urchin embryos.
- Active and denatured glycosidases were incubated with microdissected embryonic structures to assess inhibition of normal adhesive interactions.
- Enzyme purity and activity in the presence of embryo materials were confirmed.
Main Results:
- Beta-amylase (an exoglycosidase) significantly inhibited embryo cell adhesion immediately at low concentrations.
- Alpha-amylase (an endoglycosidase) showed no measurable effect on the interaction.
- Other tested glycosidases required prolonged incubation (12h) for substantial inhibition.
Conclusions:
- This study provides direct evidence implicating polyglucans with terminal 1,4-linked glucose residues in sea urchin embryonic cell adhesion.
- Beta-amylase is identified as a key enzyme capable of disrupting this specific developmental cell-cell interaction.
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