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  • Title: Review: immunomodulatory activity of pregnancy-associated plasma protein-A.
    Author: Zhabin SG, Gorin VS, Judin NS.
    Journal: J Clin Lab Immunol; 2003; 52():41-50. PubMed ID: 15079888.
    Abstract:
    This mini-review highlights the growing number of indications for the immunological importance of pregnancy-associated plasma protein-A (PAPP-A), which is a remote member of the alpha-macroglobulin plasma protein family. PAPP-A can bind a variety of cytokines and specifically cleave a binding protein for insulin-like growth factors, thereby serving as a modulator of cytokine activity. Important immune functions, such as lymphocyte proliferation response to alloantigens and lectins and expression of HLA-DR molecules are predominantly suppressed in vitro by PAPP-A. It is likely that the immunoregulatory properties of PAPP-A are very similar to that of alpha 2-macroglobulin. The experimental data allows us to suppose that PAPP-A serves to prevent the recognition of the fetus by the maternal immune system and to suppress locally the host's immune response to the tumour.
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