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Related Experiment Videos

AtT20 cells express modified forms of pp60c-src.

K L Gould1, L M Bilezikjian, T Hunter

  • 1Molecular Biology and Virology Laboratory, Salk Institute, San Diego, California 92138.

Molecular Endocrinology (Baltimore, Md.)
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

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Mouse pituitary tumor cells (AtT20) exhibit higher pp60c-src phosphotransferase activity than fibroblasts. This difference is linked to structural variations in pp60c-src, including altered phosphorylation patterns and expression of specific forms.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • pp60c-src is a proto-oncogene tyrosine kinase involved in cell growth and differentiation.
  • Variations in pp60c-src activity and structure can impact cellular functions.
  • The AtT20 cell line, derived from a mouse pituitary tumor, serves as a model for studying specific cellular processes.

Purpose of the Study:

  • To compare the properties of pp60c-src in AtT20 cells versus mouse fibroblasts.
  • To investigate the molecular basis for differences in pp60c-src activity between these cell types.

Main Methods:

  • In vitro phosphotransferase assays were used to measure enzyme activity.
  • Structural analysis of pp60c-src was performed by examining phosphorylation sites and stoichiometry.

Related Experiment Videos

  • Expression levels of different pp60c-src forms were assessed.

    • Main Results:

    • pp60c-src from AtT20 cells displayed 2- to 3-fold higher phosphotransferase activity compared to fibroblast pp60c-src.
    • AtT20 cells express lower levels of the neuronal form of pp60c-src.
    • AtT20 pp60c-src is phosphorylated at two additional N-terminal serine residues and has lower overall phosphorylation stoichiometry.

    Conclusions:

    • Structural differences in pp60c-src, particularly in phosphorylation, contribute to its elevated activity in AtT20 cells.
    • These findings highlight cell-type-specific regulation of pp60c-src activity and structure.
    • Understanding these variations is crucial for comprehending the role of pp60c-src in cellular signaling and tumorigenesis.