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Related Experiment Videos

An anti-inflammatory function for the complement anaphylatoxin C5a-binding protein, C5L2.

Norma P Gerard1, Bao Lu, Pixu Liu

  • 1Pulmonary Division, Department of Pediatrics, Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.

The Journal of Biological Chemistry
|October 6, 2005
PubMed
Summary
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The complement system receptor C5L2 limits inflammatory responses. Deleting C5L2 enhances the biological activity of C5a, suggesting C5L2 plays a crucial role in regulating inflammation.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • C5L2 is a serpentine receptor co-expressed with the C5a receptor (C5aR) on various cells, including neutrophils.
  • C5L2's lack of G protein coupling suggests a role in modulating C5a activity, potentially as a decoy receptor or through heteromeric complex formation with C5aR.

Purpose of the Study:

  • To investigate the in vivo and in vitro biological activity of C5a/C5a(desArg) in the absence of C5L2.
  • To elucidate the functional role of C5L2 in the context of complement-mediated inflammation.

Main Methods:

  • Utilized a mouse model with a targeted deletion of the C5L2 gene.
  • Assessed the biological activity of C5a and C5a(desArg) in both in vivo and in vitro experimental settings.

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Main Results:

  • Mice lacking C5L2 exhibited enhanced biological activity of C5a/C5a(desArg).
  • This enhancement of C5a activity was observed across both in vivo and in vitro assays.

Conclusions:

  • C5L2 functions to limit the pro-inflammatory response mediated by the anaphylatoxin C5a.
  • Upregulation of C5L2 may offer therapeutic benefits in inflammatory conditions such as sepsis, asthma, cystic fibrosis, and COPD.