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Related Experiment Videos

Identification of Cripto-1 in human milk.

C Bianco1, C Wechselberger, A Ebert

  • 1Laboratory of Tumor Immunology and Biology, National Cancer Institute, National Institute of Health, Bethesda, MD 20892, USA.

Breast Cancer Research and Treatment
|May 23, 2001
PubMed
Summary
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Cripto-1 (CR-1), a peptide crucial for mammary gland development, is found in human milk. This protein may play a role in regulating mammary gland function during lactation.

Area of Science:

  • Biochemistry
  • Developmental Biology
  • Oncology

Background:

  • Cripto-1 (CR-1) is an epidermal growth factor (EGF)-related peptide vital for mammary gland development.
  • CR-1 expression is elevated during pregnancy and lactation in mice and implicated in mammary tumorigenesis.
  • Its presence in human milk during lactation has not been previously established.

Purpose of the Study:

  • To determine if CR-1 protein is present in human milk.
  • To quantify CR-1 levels in human milk.
  • To investigate the biological activity of CR-1 purified from human milk.

Main Methods:

  • Western blot analysis to detect immunoreactive CR-1 protein in human milk samples.
  • Enzyme-linked immunosorbent assay (ELISA) to quantify CR-1 concentration.

Related Experiment Videos

  • Functional assay assessing CR-1's ability to stimulate mitogen-activated protein kinase (MAPK) phosphorylation in epithelial cells.

    • Main Results:

    • A 28 kDa immunoreactive CR-1 protein was detected in 24 out of 24 human milk samples.
    • CR-1 concentration in human milk ranged from 62 to 118 ng/ml.
    • Purified human milk CR-1 stimulated MAPK phosphorylation in NMuMG mouse mammary epithelial cells.

    Conclusions:

    • CR-1 protein is present in human milk at significant concentrations.
    • Human milk-derived CR-1 exhibits biological activity, stimulating MAPK signaling.
    • These findings suggest a potential role for CR-1 in human mammary gland development and function during lactation.