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Expression and bioactivity analysis of recombinant beta-CPP dimer.

Y J Jiang1, Q Z Li, H B Yan

  • 1Life Science and Biotechnique Research Center, Northeast Agricultural University, Harbin, Heilongjiang, 150030 China.

Journal of Dairy Science
|September 21, 2004
PubMed
Summary
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Beta-casein phosphopeptide (beta-CPP) dimer enhances calcium uptake in sperm and stimulates spleen cell proliferation. This bioactive peptide also shows potential in inducing apoptosis in malignant tumor cells.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Beta-casein phosphopeptide (beta-CPP) is a bioactive peptide known for its mineral-binding properties, particularly calcium.
  • Understanding the broader biological effects of beta-CPP requires further investigation beyond its mineral transport capabilities.

Purpose of the Study:

  • To construct a eukaryotic expression vector for a beta-CPP dimer.
  • To investigate the biological activities of the recombinant beta-CPP dimer produced in stably transfected Chinese hamster ovary (CHO) cells.

Main Methods:

  • Construction and transfection of a eukaryotic expression vector encoding a beta-CPP dimer into CHO cells.
  • Selection and identification of stable cell lines expressing the recombinant beta-CPP dimer.
  • Purification and activity assays of the recombinant beta-CPP dimer.

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Main Results:

  • Stable CHO cell lines expressing the beta-CPP dimer were successfully established.
  • The purified recombinant beta-CPP dimer demonstrated significant biological activities.
  • These activities include improved Ca(2+) uptake by sperm, stimulation of spleen cell proliferation, and induction of apoptosis in certain malignant tumor cells.

Conclusions:

  • The recombinant beta-CPP dimer possesses diverse biological functions.
  • Beta-CPP dimer shows potential therapeutic applications in improving calcium absorption, immune modulation, and cancer treatment.