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Structure, expression, and activity of Tyro 3, a neural adhesion-related receptor tyrosine kinase

C Lai1, M Gore, G Lemke

  • 1Molecular Neurobiology Laboratory, Salk Institute, La Jolla, California 92037.

Oncogene
|September 1, 1994
PubMed

Insights

Researchers identified Tyro 3, a protein-tyrosine kinase (PTK), in the mouse central nervous system (CNS). This receptor is crucial for neuron development and may play a role in cancer.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Oncology

Background:

  • Tyro 3 is a receptor protein-tyrosine kinase (PTK) found in the mammalian central nervous system (CNS).
  • Its expression patterns suggest a role in neuronal development and function.

Purpose of the Study:

  • To isolate and characterize mouse cDNA clones encoding the Tyro 3 receptor.
  • To investigate the expression patterns and potential functions of Tyro 3 in the CNS.
  • To explore the potential oncogenic properties of Tyro 3.

Main Methods:

  • Isolation of mouse cDNA clones encoding Tyro 3.
  • Analysis of gene expression in different brain regions and developmental stages.
  • Protein expression analysis using immunoblot and immunoprecipitation.
  • Immunohistochemical analysis of cultured hippocampal cells.
  • Functional assays using transfected fibroblasts.

Main Results:

  • Tyro 3 gene expression is upregulated in specific brain regions (neocortex, cerebellum, hippocampus) postnatally, coinciding with synaptogenesis.
  • High Tyro 3 expression is maintained in the adult CNS.
  • The Tyro 3 protein (125 kD) is abundant in CNS synaptosomes and is a neuronal product.
  • Fibroblasts transfected with Tyro 3 gained the ability to grow in soft agar, indicating potential oncogenicity.

Conclusions:

  • Tyro 3 is a glycoprotein receptor expressed in the CNS, with structural similarities to cell recognition molecules.
  • Its expression profile suggests a significant role in neuronal development and function.
  • Tyro 3 may possess oncogenic properties, warranting further investigation.

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