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Related Experiment Videos

Eutopic and ectopic macromolecular human placental lactogen.

I S Calvert, B D Weintraub, L Panton

    American Journal of Obstetrics and Gynecology
    |May 1, 1985
    PubMed
    Summary

    Macromolecular human placental lactogen, previously overlooked, exists in various pregnancy and tumor conditions. This study shows it

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    Endocrinology·2000

    Area of Science:

    • Biochemistry
    • Endocrinology
    • Reproductive Biology

    Background:

    • Macromolecular forms of human placental lactogen (hPL) are poorly understood.
    • They were previously considered minor components or laboratory artifacts.

    Purpose of the Study:

    • To investigate the presence and significance of macromolecular hPL in various biological samples.
    • To determine if macromolecular hPL is a true biological entity or an artifact.

    Main Methods:

    • Serum and placental tissue samples from normal pregnancy, tumors, and ectopic production were analyzed.
    • Size exclusion chromatography (Sephadex G-100) was used to separate molecular forms.
    • Radioimmunoassay (RIA) quantified placental lactogen in eluted fractions.

    Main Results:

    • Macromolecular hPL (MW > 150,000 daltons) was detected in all samples at the void volume.
    • It constituted <4% of total hPL in normal third trimester and mole, but up to 19% in malignant cases.
    • In some first-trimester placental extracts, macromolecular hPL was the dominant form (>45%).
    • Macromolecular hPL from first-trimester placenta was stable and immunochemically similar to monomeric hPL, unlike third-trimester forms.

    Conclusions:

    • Macromolecular hPL is likely not an artifact.
    • It can represent a significant fraction of immunoactive hPL, particularly in specific pregnancy stages and pathological conditions.
    • Further research is warranted to elucidate its biological role.

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