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Related Experiment Videos

Alpha-fetoprotein-derived antiestrotrophic octapeptide.

F B Mesfin1, J A Bennett, H I Jacobson

  • 1Department of Biochemistry and Molecular Biology, Mail Code 10, Albany Medical College, 47 New Scotland Ave., Albany, NY 12208, USA.

Biochimica Et Biophysica Acta
|March 23, 2000
PubMed
Summary

Alpha-fetoprotein (AFP) has antiestrotrophic properties, with a minimal active peptide fragment identified. This discovery offers potential for new estrogen-dependent breast cancer therapies.

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Area of Science:

  • Biochemistry
  • Endocrinology
  • Oncology

Background:

  • Alpha-fetoprotein (AFP) is a fetal serum protein with suggested therapeutic potential.
  • Experimental evidence indicates AFP possesses antiestrotrophic activity, relevant for estrogen-dependent breast cancer.
  • The antiestrotrophic activity was previously localized to a 34-amino acid peptide, P447.

Purpose of the Study:

  • To identify the shortest peptide analog of AFP that retains antiestrotrophic activity.
  • To evaluate the therapeutic potential of AFP-derived peptides in treating or preventing breast cancer.

Main Methods:

  • Solid-phase peptide synthesis was used to generate truncated analogs of P447.
  • An immature mouse uterine growth assay measured the inhibition of estradiol-stimulated uterine growth.

Related Experiment Videos

  • The antiestrotrophic activity of peptides was also tested on T47D human breast cancer cells in culture.

    • Main Results:

    • An 8-amino acid peptide, P472-2 (amino acids 472-479), retained significant antiestrotrophic activity.
    • Peptides shorter than eight amino acids were found to be inactive.
    • Peptide P472-2 demonstrated maximal inhibitory activity (49%) comparable to P447 (45%) and intact AFP (35-45%) in the uterine assay and inhibited breast cancer cell growth.

    Conclusions:

    • Peptide P472-2 represents the minimal sequence in AFP with retained antiestrotrophic activity.
    • The synthetic octapeptide P472-2 shows promise as a potential therapeutic agent against estrogen-driven breast cancer.
    • This minimal peptide offers a defined structure for developing novel drugs that oppose estrogen's action in breast cancer development.