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Proteoglycans with affinity for the neuralizing factor and the vegetalizing factor (activin A homologue)

Hildegard Tiedemann1, Jochen Born1, Heinz Tiedemann1

  • 1Institut für Molekularbiologie und Biochemie, Freie Universität Berlin, Arnimallee 22, W-1000, Berlin 33, Germany.

Roux'S Archives of Developmental Biology : the Official Organ of the EDBO
|March 18, 2017
PubMed

Insights

Chicken embryo proteoglycans bind neural and vegetal inducers, forming inactive complexes. Enzymatic cleavage of proteoglycan core proteins restores inducer activity, suggesting a regulatory role in development.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Proteoglycans are key extracellular matrix components.
  • Inducing factors regulate embryonic development.
  • The interaction between proteoglycans and inducing factors is not fully understood.

Purpose of the Study:

  • To investigate the interaction between chicken embryo proteoglycans and neural/vegetal inducing factors.
  • To determine the effect of these interactions on inducing factor activity.
  • To elucidate the role of proteoglycan core proteins in this process.

Main Methods:

  • Isolation and characterization of proteoglycans from chicken embryos.
  • Binding assays to study proteoglycan-factor interactions.
  • Enzymatic cleavage of proteoglycan core proteins.
  • Assays to measure the biological activity of inducing factors and complexes.

Main Results:

  • Proteoglycans bind both neuralizing and vegetalizing inducing factors.
  • Proteoglycan-factor complexes exhibit no inherent inducing activity.
  • Enzymatic removal of proteoglycan core proteins eliminates the inhibitory effect of proteoglycans on inducing activity.

Conclusions:

  • Chicken embryo proteoglycans can sequester and inactivate developmental inducing factors.
  • The core protein of proteoglycans plays a crucial role in this inhibitory interaction.
  • These findings suggest a regulatory mechanism for controlling the availability and activity of inducing factors during embryonic development.
Keywords:
Activin AComplex formationNeuralizing inducing factorProteoglycansVegetalizing inducing factor

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