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Related Experiment Videos

Isolation, characterization, and cloning of porcine complement component C7.

A Agah1, M C Montalto, C L Kiesecker

  • 1Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|July 6, 2000
PubMed
Summary

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This study characterizes porcine complement component C7, revealing high structural and functional conservation with human C7. These findings advance understanding of the complement system across species.

Area of Science:

  • Immunology
  • Complement System Biology

Background:

  • The terminal complement complex is crucial for immune responses.
  • Complement component 7 (C7) is essential for terminal complement complex assembly.
  • Porcine C7 had not been previously characterized.

Purpose of the Study:

  • To isolate and characterize porcine complement component C7.
  • To determine the structural and functional similarities between porcine and human C7.
  • To investigate the expression and cross-species reactivity of porcine C7.

Main Methods:

  • Affinity chromatography for porcine C7 isolation.
  • Molecular cloning and sequencing of porcine C7 cDNA.
  • Western blotting and mRNA expression analysis.
  • Functional assays using C7-depleted human sera and cross-species reactivity tests.

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Main Results:

  • Porcine C7 isolated as a ~90-100 kDa glycoprotein.
  • Porcine C7 shares 80% amino acid identity with human C7, including conserved structural features.
  • Porcine C7 mRNA is expressed in various tissues, excluding certain leukocytes.
  • Purified porcine C7 restored hemolytic activity in C7-depleted human sera.
  • An inhibitory antibody against porcine C7 cross-reacted with human, rabbit, and rat C7, indicating conserved epitopes.

Conclusions:

  • Porcine C7 is highly conserved structurally and functionally with human C7.
  • These findings highlight conserved C7 epitopes across species, relevant for complement research.
  • Characterization of porcine C7 provides a valuable model for studying complement system mechanisms.