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Brain aggrecan

N B Schwartz1, M Domowicz, R C Krueger

  • 1Department of Pediatrics, University of Chicago, Illinois 60615, USA.

Perspectives on Developmental Neurobiology
|January 1, 1996
PubMed
Summary

Aggrecan, a key cartilage molecule, is also found in developing brain and notochord, suggesting broader developmental roles beyond skeletal tissue. This discovery offers new insights into gene regulation during embryonic development.

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Area of Science:

  • Developmental Biology
  • Extracellular Matrix (ECM) Biology
  • Proteoglycan Research

Background:

  • The extracellular matrix (ECM) plays a crucial role in tissue development and differentiation.
  • Aggrecan, a large chondroitin sulfate proteoglycan, was traditionally considered a marker for cartilage differentiation.
  • Recent findings indicate aggrecan's presence in non-skeletal tissues, challenging its established role.

Purpose of the Study:

  • To investigate the expression patterns of aggrecan in developing chick embryos beyond cartilage.
  • To characterize the distinct roles and regulation of aggrecan in different developing tissues.
  • To explore aggrecan's function in neural development and cell migration.

Main Methods:

  • Analysis of aggrecan expression in chick embryos at various developmental stages (cartilage, brain, notochord).
  • Biochemical, biosynthetic, and molecular characterization of aggrecan proteoglycans.
  • Utilizing animal models with defects in aggrecan biosynthesis.

Main Results:

  • Aggrecan expression was identified in chick cartilage, brain, and notochord with distinct temporal and spatial patterns.
  • In the brain, aggrecan expression correlates with neuronal migration and may be involved in arrest mechanisms.
  • In the notochord, aggrecan expression precedes chondrogenesis and correlates with neural crest cell migration inhibition.
  • Despite post-translational modifications, aggrecan species in different tissues originate from a single gene.

Conclusions:

  • Aggrecan exhibits diverse expression patterns and functions in multiple, ontogenetically unrelated developing tissues.
  • The single aggrecan gene provides a model for studying gene regulation and the impact of genetic alterations across different developmental programs.
  • These findings expand the known functional repertoire of aggrecan in embryonic development, particularly in neural and skeletal systems.

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