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Related Experiment Videos

Placenta-bound immunoglobulins

A Jurjus, D A Wheeler, R C Gallo

    Arthritis and Rheumatism
    |November 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Human placental eluates contain immunoglobulins that neutralize retroviral reverse transcriptase (RT) activity in vitro. However, purified placental IgG did not neutralize RT but inhibited mixed lymphocyte reactions.

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    Area of Science:

    • Immunology
    • Virology
    • Biochemistry

    Background:

    • Human placental trophoblasts are a source of immunoglobulins.
    • Immunoglobulins play crucial roles in immune responses and can interact with viral components.

    Purpose of the Study:

    • To investigate the presence and function of immunoglobulins in human placental eluates.
    • To determine if placental eluates or their purified immunoglobulin fractions can neutralize retroviral reverse transcriptase (RT) activity.
    • To assess the effect of purified placental IgG on mixed lymphocyte reactions.

    Main Methods:

    • Preparation of low pH eluates from human term placental trophoblasts.
    • Qualitative analysis for immunoglobulins (IgG, IgA, IgM).
    • Isolation of IgC-rich fractions using DEAE-cellulose chromatography.

    Related Experiment Videos

  • In vitro neutralization assays for reverse transcriptase (RT) activity of various retroviruses.
  • Mixed lymphocyte reaction assays using purified placental IgG.

    • Main Results:

    • Placental eluates contained IgG, IgA, and IgM.
    • IgC-rich fractions from placental eluates neutralized the catalytic activity of RT from several retroviruses in vitro.
    • RT from baboon endogenous virus (BEV) was more susceptible to neutralization by some eluates compared to RT from feline leukemia virus (FeLV).
    • Purified IgG from placental eluates did not neutralize RT but inhibited mixed lymphocyte reactions.

    Conclusions:

    • Human placental eluates possess factors, likely immunoglobulins, capable of neutralizing retroviral RT activity.
    • Placental IgG exhibits immunomodulatory functions, inhibiting mixed lymphocyte reactions, distinct from its potential role in RT neutralization.
    • These findings highlight the complex immunological properties of placental-derived factors.