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Related Experiment Videos

The complement inhibitor, CRIT, undergoes clathrin-dependent endocytosis.

Jameel Inal1, Sylvie Miot, Jürg A Schifferli

  • 1University Hospital Basel, Immunonephrology, Department of Research, 4031 Basel, Switzerland. j.inal@londonmet.ac.uk

Experimental Cell Research
|August 23, 2005
PubMed
Summary

Complement C2 receptor inhibitor trispanning (CRIT) internalizes via clathrin-coated pits, a pathway distinct from caveolae. This study reveals CRIT

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Complement C2 receptor inhibitor trispanning (CRIT) regulates complement system activation by binding C2.
  • CRIT limits C3 convertase formation on cell surfaces, preventing excessive complement cascade.
  • Understanding CRIT's cellular trafficking is crucial for its role in immune regulation.

Purpose of the Study:

  • To investigate the endocytosis mechanism of human CRIT.
  • To determine the pathway involved in CRIT internalization from the plasma membrane.
  • To elucidate CRIT's intracellular localization after endocytosis.

Main Methods:

  • Flow cytometry and immunofluorescence microscopy were employed to track CRIT.
  • Cells were treated with inhibitors of clathrin-dependent and caveolae/raft-dependent endocytosis.

Related Experiment Videos

  • CRIT association with beta-arrestin-2 and intracellular localization were analyzed.

    • Main Results:

    • Human CRIT undergoes endocytosis from the plasma membrane.
    • CRIT internalization occurs primarily via clathrin-coated pits, inhibited by hypertonic medium and chlorpromazine.
    • Nystatin and filipin did not inhibit CRIT endocytosis, suggesting no caveolae/raft involvement.
    • CRIT associates with beta-arrestin-2 and localizes to the perinuclear region, not the nucleus.

    Conclusions:

    • CRIT internalization is mediated by the clathrin pathway.
    • This is the first report of clathrin-mediated endocytosis for a complement serum protein receptor.
    • CRIT's intracellular trafficking involves the perinuclear region and beta-arrestin-2 association.