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Related Experiment Videos

Synthesis of complement proteins in amnion

Y Katz1, S Gur, M Aladjem

  • 1Allergy Immunology Unit, Assaf-Harofeh Medical Center, Zerifin, Israel.

The Journal of Clinical Endocrinology and Metabolism
|July 1, 1995
PubMed
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The amnion synthesizes key complement system proteins, including C1r, C1s, C1 inhibitor, factor B, C3, and factor H. Amnion tissue shows distinct factor B synthesis regulation compared to cells, suggesting in vivo stimulation.

Area of Science:

  • Immunology
  • Cell Biology
  • Reproductive Biology

Background:

  • The amnion is recognized as a metabolically active tissue.
  • It synthesizes various biologically significant products.
  • Understanding amnion's role in the complement system is crucial.

Purpose of the Study:

  • To investigate the synthesis and secretion of complement system proteins by amnion tissue and cells.
  • To compare the synthesis patterns of these proteins in tissue versus cell cultures.
  • To explore the regulation of complement protein synthesis, particularly factor B, by interleukin-1.

Main Methods:

  • Analysis of amnion tissue explants and amnion-derived epithelial cells.
  • Detection and characterization of synthesized complement proteins (C1r, C1s, C1 inhibitor, factor B, C3, factor H, C2, C5).

Related Experiment Videos

  • Comparison of protein synthesis in tissue and cell lines (HEp2) and assessment of interleukin-1 effects.

    • Main Results:

    • Amnion synthesizes and secretes six complement proteins: C1r, C1s, C1 inhibitor, factor B, C3, and factor H.
    • Synthesis of C2 was minimal/variable; C5 was undetected.
    • Factor B synthesis was significantly higher (12-fold) in amnion tissue than in cells and was not upregulated by interleukin-1 in tissue, unlike in cells (11.7-fold increase).

    Conclusions:

    • Amnion is a significant source of complement proteins found in amniotic fluid.
    • Amnion contributes to local host defense, potentially alongside endometrial glandular epithelial cells.
    • Amnion tissue appears to be stimulated in vivo for factor B synthesis and exhibits differential regulation compared to isolated cells.