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Immune complexes and vasoactivity generated from platelets in pre-eclampsia.

R L Medcalf, R J Kuhn, J D Mathews

    Clinical and Experimental Hypertension. Part B, Hypertension in Pregnancy
    |January 1, 1982
    PubMed
    Summary
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    Immune complexes activate platelets in preeclampsia, releasing vasoactive agents that may cause hypertension. This study found higher immune complex levels in preeclampsia patients, supporting this mechanism.

    Area of Science:

    • Obstetrics and Gynecology
    • Immunology
    • Cardiovascular Research

    Background:

    • Circulating immune complexes are implicated in preeclampsia pathogenesis.
    • Platelet activation is a potential mechanism contributing to preeclampsia's hypertension.

    Purpose of the Study:

    • To investigate the role of immune complexes in platelet activation in preeclampsia.
    • To determine if immune complexes found in preeclampsia patients can induce hypertension-related effects.

    Main Methods:

    • Modified polyethylene glycol protein-A immune complex assay to quantify immune complexes.
    • Small volume bio-assay to assess platelet activation and vasoactive agent release.
    • In vitro human blood vessel constriction assay.

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    Main Results:

    • Fourteen of twenty preeclampsia patients had immune complexes exceeding 20 micrograms/ml heat aggregated IgG.
    • Only six of nineteen normal controls showed similar immune complex levels.
    • Heat aggregated IgG above 20 micrograms/ml activated platelets to release vasoactive agents causing in vitro blood vessel constriction.

    Conclusions:

    • Elevated immune complexes in preeclampsia patients suggest a role in disease pathology.
    • In vivo platelet activation by immune complexes releases vasoactive agents.
    • This mechanism contributes to the characteristic hypertension of preeclampsia.