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Related Experiment Videos

Polymeric IgA are sulfated proteins.

R Boisgard1, G Charpigny, E Chanat

  • 1Institut National de la Recherche Agronomique, Station de Physiologie Animale, F-78352, Jouy-en-Josas, France.

FEBS Letters
|December 22, 1999
PubMed
Summary
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Rabbit mammary glands secrete sulfated proteins, including immunoglobulin A (IgA) and J chain. These findings indicate that polymeric IgA undergoes sulfation during its transport through epithelial cells.

Area of Science:

  • Biochemistry
  • Immunology
  • Cell Biology

Background:

  • Mammary gland secretions contain various proteins, some of which are sulfated.
  • The specific identities and functions of sulfated proteins in milk are not fully understood.

Purpose of the Study:

  • To identify and characterize the main sulfated proteins secreted by rabbit mammary gland tissue.
  • To investigate the nature of sulfation in these proteins and their potential roles.

Main Methods:

  • Protein purification and characterization using techniques like electrophoresis and molecular weight determination.
  • Identification of protein components through co-purification and established immunological methods.

Main Results:

  • Identified major sulfated proteins with molecular masses of approximately 67 kDa, 63 kDa, and 23 kDa.

Related Experiment Videos

  • The 67-63 kDa proteins were identified as heavy chains of immunoglobulin A (IgA), and the 23 kDa protein as J chain.
  • Sulfate groups were primarily linked to carbohydrates in the 67-63 kDa proteins.
  • Sulfation of alpha-chains was also observed in rat mammary and rabbit lacrimal glands.

    • Conclusions:

    • Polymeric immunoglobulin A (IgA) is sulfated in mammary gland secretions.
    • This sulfation occurs after IgA is produced by plasma cells and transported through epithelial cells.
    • The findings suggest a conserved mechanism of IgA sulfation across different secretory tissues and species.