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A phorbol ester-binding inhibitory factor from human placenta. Partial purification, characterization and biological

E Hamel, H Yamasaki, J L Tayot

    IARC Scientific Publications
    |January 1, 1984
    PubMed
    Summary

    A novel phorbol ester binding inhibitory factor (PEBIF) from human placenta partially purifies and inhibits cell differentiation. This factor shares some biological responses with 12-O-tetradecanoyl phorbol-13-acetate (TPA) but does not mimic all its effects.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Pharmacology

    Background:

    • Phorbol esters, like 12-O-tetradecanoyl phorbol-13-acetate (TPA), are potent modulators of cellular processes.
    • Understanding factors that regulate phorbol ester binding is crucial for deciphering their biological effects.

    Purpose of the Study:

    • To identify and characterize a factor from human placenta that inhibits phorbol ester binding.
    • To investigate the biological activities of this inhibitory factor and compare them to TPA.

    Main Methods:

    • Partial purification of the inhibitory factor from human placenta.
    • Assays for 3H-phorbol-12,13-dibutyrate (PDBu) binding inhibition on various cell types.
    • Assessment of cellular differentiation and other biological responses.

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    Main Results:

    • A phorbol ester binding inhibitory factor (PEBIF) was purified, showing sensitivity to pepsin but resistance to trypsin, heat, and acid.
    • PEBIF inhibited PDBu binding competitively or non-competitively depending on the cell type.
    • PEBIF inhibited HMBA-induced differentiation in TPA-sensitive cells and increased 2-deoxyglucose uptake in mouse fibroblasts, similar to TPA.
    • PEBIF did not induce Epstein-Barr virus, inhibit intercellular communication, or induce differentiation in HL-60 cells, unlike TPA.

    Conclusions:

    • PEBIF is a novel inhibitor of phorbol ester binding with distinct biochemical properties.
    • PEBIF shares some, but not all, biological activities with TPA, suggesting differential downstream signaling pathways.
    • This factor provides a new tool for studying the mechanisms of phorbol ester action.