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Developmentally regulated protease expression during sea urchin embryogenesis

O Vafa1, D Nishioka

  • 1Department of Biology, Georgetown University, Washington, DC 20057.

Molecular Reproduction and Development
|January 1, 1995
PubMed
Summary

Two metalloproteases appear early in sea urchin development and increase during gastrulation. Their expression depends on gene transcription, suggesting a role in embryonic development and tissue remodeling.

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Area of Science:

  • Developmental Biology
  • Marine Biology
  • Biochemistry

Background:

  • Protease activity is crucial for embryonic development and tissue remodeling.
  • Understanding protease function during sea urchin gastrulation is key to developmental processes.

Purpose of the Study:

  • To investigate the temporal expression and characteristics of proteases during early sea urchin development.
  • To determine the role of specific proteases in gastrulation and blastocoelic matrix remodeling.

Main Methods:

  • SDS-PAGE gelatin substrate zymography to identify and characterize proteases.
  • In situ zymography to confirm protease localization.
  • Treatment with actinomycin D to assess transcriptional dependence.

Main Results:

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  • Two major proteases (57 and 50 kDa) identified, appearing early and increasing during gastrulation.
  • These proteases are characterized as metalloproteases, inhibited by chelators and active at neutral to basic pH.
  • Protease expression is transcriptionally dependent and localized to the blastocoel, correlating with gastrulation stages.

Conclusions:

  • The 57- and 50-kDa metalloproteases are essential for sea urchin gastrulation.
  • Their spatiotemporal expression suggests a role in blastocoelic matrix remodeling during embryonic development.