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Does ciliary neurotrophic factor serve a different function in the rat versus the chicken?

T Finn1, R Nishi

  • 1Department of Cell and Developmental Biology, Oregon Health Sciences University, Portland 97201, USA.

Perspectives on Developmental Neurobiology
|January 1, 1996
PubMed
Summary

Ciliary neurotrophic factor (CNTF) supports neuron survival, while growth promoting activity (GPA) also aids neuron growth. Though structurally similar, they differ in secretion and function, suggesting distinct roles in rodents and birds.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Ciliary neurotrophic factor (CNTF) identified for supporting chick ciliary ganglion (CG) neuron survival in vitro.
  • Growth promoting activity (GPA) identified as another trophic molecule for CG neurons.
  • CNTF purified from rabbit/rat sciatic nerve; GPA purified from chicken sciatic nerve.

Purpose of the Study:

  • Compare and contrast CNTF and GPA.
  • Discuss similarities and differences in biological activities, molecular structure, receptor signaling, and cellular distribution.
  • Suggest potential distinct functions in rodents and birds.

Main Methods:

  • Purification of CNTF and GPA from nerve and eye tissues.
  • Cloning of cDNA sequences for CNTF and GPA.

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  • Structural homology analysis.
  • Review of biological activities, receptor signaling, and cellular distribution data.

    • Main Results:

    • CNTF (rabbit, rat) shows significant structural homology and is not secreted in large amounts.
    • GPA is 49% homologous to CNTF and is secreted by cells.
    • Differences in biological activities, molecular structure, receptor signaling, and cellular distribution were observed.

    Conclusions:

    • CNTF and GPA share some similarities but exhibit key differences in structure, secretion, and potentially function.
    • These neurotrophic factors may have distinct roles in different species, particularly between rodents and birds.