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Related Experiment Videos

Serum responsive gene expression mediated by Sp1

A P Kumar1, A P Butler

  • 1The University of Texas M. D. Anderson Cancer Center, Science Park-Research Division, Smithville, Texas, 78957, USA.

Biochemical and Biophysical Research Communications
|November 25, 1998
PubMed
Summary
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Serum stimulation increases Sp1 (Specificity Protein 1) DNA-binding activity in Rat2 fibroblasts, independent of Sp1 protein levels. This suggests Sp1 phosphorylation regulates its DNA-binding activity and role in mitogenic signal transduction.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Transcription Factors

Background:

  • Specificity Protein 1 (Sp1) is a transcription factor involved in gene regulation.
  • Mitogenic signals, such as serum stimulation, can alter cellular processes.
  • The regulation of Sp1 DNA-binding activity in response to mitogens is not fully understood.

Purpose of the Study:

  • To investigate the effect of serum stimulation on Sp1 DNA-binding activity in Rat2 fibroblasts.
  • To determine if changes in Sp1 protein levels contribute to altered DNA-binding activity.
  • To explore the role of Sp1 phosphorylation in its DNA-binding activity.

Main Methods:

  • Electrophoretic mobility shift assays (EMSA) using an Sp1 oligonucleotide probe.
  • Immunoblot analysis to quantify Sp1 protein levels.

Related Experiment Videos

  • Transient transfection assays with reporter constructs containing Sp1 binding sites.
  • In vitro dephosphorylation of nuclear extracts using potato acid phosphatase.

    • Main Results:

    • Serum stimulation significantly increased Sp1 DNA-binding activity in Rat2 fibroblast nuclear extracts.
    • Sp1 protein levels in the nucleus did not change upon serum stimulation.
    • Transcriptional activity of Sp1-dependent reporter constructs was enhanced by serum stimulation.
    • Dephosphorylation of nuclear extracts abolished Sp1 DNA-binding activity.

    Conclusions:

    • Sp1 DNA-binding activity is enhanced by serum stimulation in Rat2 fibroblasts.
    • The increase in Sp1 DNA-binding is likely regulated post-translationally, possibly via phosphorylation.
    • Sp1 may play a role in mediating signal transduction pathways activated by mitogenic signals.