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Related Experiment Videos

Characterization of complement activity in turkeys: evidence for classical and alternative complement pathways.

M G Ellis1, S J Lamont, L H Arp

  • 1Department of Animal Science, Iowa State University, Ames 50011.

Poultry Science
|May 1, 1989
PubMed
Summary
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Turkey serum exhibits two distinct complement pathways, identified using specific red blood cell lysis tests with inhibitors. These findings reveal differences in how turkey complement responds to various activators and blocking agents.

Area of Science:

  • Immunology
  • Comparative Medicine
  • Avian Biology

Background:

  • The complement system is crucial for innate immunity in vertebrates.
  • Understanding avian complement pathways is vital for disease resistance and vaccine development.
  • Mammalian complement pathways are well-characterized, but avian pathways require further elucidation.

Purpose of the Study:

  • To investigate the presence and characteristics of complement pathways in turkey serum.
  • To differentiate between the classical and alternative complement pathways in turkeys.
  • To compare the functional activity of turkey complement with mammalian systems.

Main Methods:

  • Development of hemolytic assays using antibody-sensitized sheep red blood cells (SSRBC) and unsensitized horse red blood cells (HRBC).

Related Experiment Videos

  • Treatment of turkey serum with complement inhibitors like EDTA and EGTA, and activators such as zymosan and inulin.
  • Analysis of residual hemolytic activity against SSRBC and HRBC after inhibitor/activator treatment.

    • Main Results:

    • Lysis of SSRBC was inhibited by EDTA, EGTA, and carrageenan.
    • Lysis of HRBC was inhibited by EDTA but not by EGTA or carrageenan.
    • Magnesium addition restored HRBC lysis in EGTA-treated serum, while SSRBC lysis remained blocked.
    • Zymosan and inulin treatments depleted hemolytic activity against both SSRBC and HRBC.

    Conclusions:

    • The differential inhibition and activation patterns demonstrate the existence of two distinct complement pathways in turkeys.
    • These findings suggest that turkeys possess both classical and alternative complement pathways, similar to mammals.
    • This study provides foundational insights into avian immunology and complement system function.