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Related Experiment Videos

Phorbol ester-responsive H-ras1 gene promoter contains multiple TPA-inducible/AP-1-binding consensus sequence

D A Spandidos1, R A Nichols, N M Wilkie

  • 1Beatson Institute for Cancer Research, Glasgow, Scotland.

FEBS Letters
|November 21, 1988
PubMed
Summary

Researchers explored the H-ras1 promoter

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Cancer Research

Background:

  • The H-ras1 proto-oncogene plays a critical role in cell signaling pathways.
  • Understanding the transcriptional regulation of H-ras1 is crucial for cancer research.
  • Phorbol ester 12-myristate 13-acetate (TPA) is a known activator of cellular signaling.

Purpose of the Study:

  • To investigate the regulatory elements within the H-ras1 promoter.
  • To determine the role of TPA-inducible elements in H-ras1 transcription.
  • To explore the involvement of AP-1 transcription factors in H-ras1 gene expression.

Main Methods:

  • Construction of recombinant DNA plasmids containing H-ras1 promoter-linked reporter genes (CAT).
  • Transfection of plasmids into rat 208F fibroblasts and selection of stable transformants.

Related Experiment Videos

  • Assay of chloramphenicol acetyltransferase (CAT) activity following TPA treatment.

    • Main Results:

    • Stable transformants expressing the CAT gene under the control of the H-ras1 promoter showed low basal CAT activity.
    • TPA treatment significantly increased CAT activity in cells transfected with H-ras1 promoter constructs.
    • Cells transfected with a promoterless CAT gene did not exhibit TPA-induced CAT activity.
    • Analysis revealed TPA-inducible and AP-1-binding consensus sequences within the H-ras1 promoter region.

    Conclusions:

    • The H-ras1 promoter contains elements responsive to TPA.
    • AP-1-like transcription factors likely regulate H-ras1 gene transcription.
    • These findings provide insights into the molecular mechanisms controlling H-ras1 expression.