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Related Experiment Videos

Multiple cleavage sites for polymeric immunoglobulin receptor.

Masatake Asano1, Nobuko Takenouchi-Ohkubo, Naoyuki Matsumoto

  • 1Department of Pathology, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan. asano-m@dent.nihon-u.ac.jp

Immunology
|July 24, 2004
PubMed
Summary

Investigating human polymeric immunoglobulin receptor (pIgR) cleavage in BHK cells revealed that removing the cytoplasmic region accelerated secretory component (SC) release. Domain 6 is crucial but not the sole cleavage site.

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Area of Science:

  • Molecular and Cellular Biology
  • Immunology
  • Biochemistry

Background:

  • The human polymeric immunoglobulin receptor (pIgR) plays a critical role in the transport of immunoglobulins.
  • Understanding pIgR cleavage is essential for elucidating its function and regulation.

Purpose of the Study:

  • To investigate the role of specific pIgR regions in its efficient cleavage.
  • To identify potential cleavage sites beyond the known region in domain 6.

Main Methods:

  • Expression of human pIgR in baby hamster kidney (BHK) cells using a recombinant vaccinia virus transfection system.
  • Analysis of pIgR cleavage and secretory component (SC) release in wild-type and mutant forms.
  • Utilized proteinase inhibitor (leupeptin) to assess cleavage inhibition.

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Main Results:

  • A pIgR mutant lacking the cytoplasmic region showed significantly faster release of SC into the supernatant.
  • A mutant lacking extracellular domain 6 could still be cleaved, yielding a mutant SC, indicating other cleavage sites.
  • Transport kinetics of the domain 6 mutant were comparable to wild-type pIgR.

Conclusions:

  • The cytoplasmic region of pIgR influences the rate of its cleavage and SC release.
  • While domain 6 contains a primary cleavage site, additional cleavage sites likely exist in the pIgR molecule.