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The immunosuppression mechanism of hypodermin A on complement.

Ren-Jin Chen1, An-Kang Hu2, Hong-Hua Yuan3

  • 1Laboratory Animal Center, Xuzhou Medical College, Xuzhou, Jiangsu, China.

Parasitology International
|January 14, 2014
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Hypodermin A (HA), a protease from cattle grubs, degrades guinea-pig complement component 3 (C3). This suggests HA

Keywords:
Complement C3Hypodermin ASerine proteaseXenogeneic rejection

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Area of Science:

  • Immunology
  • Parasitology
  • Biochemistry

Background:

  • Hypodermin A (HA) is a serine protease from Hypoderma lineatum larvae.
  • HA influences inflammatory and immune responses in cattle.

Purpose of the Study:

  • To investigate the interaction between recombinant HA and guinea-pig complement component 3 (C3).
  • To explore HA's potential as an immunosuppressive agent.

Main Methods:

  • cDNA synthesis and sequencing of HA.
  • Co-immunoprecipitation assays to study HA-C3 interaction.
  • Cell-based assays using Cos7 cells expressing HA.
  • Electrophoretic mobility shift assay (EMSA) to detect DNA binding sites.

Main Results:

  • Recombinant HA degrades guinea-pig C3, C6, and C5b-9.
  • Cells expressing HA showed increased resistance to C3-mediated lysis.
  • A presumed DNA binding site between HA and C3 was identified.
  • Mutated HA (mHA) lost the ability to degrade C3 or inhibit complement.

Conclusions:

  • Recombinant HA effectively degrades components of the guinea-pig complement system.
  • HA possesses immunosuppressive properties by targeting the complement pathway.
  • HA shows potential as an immunosuppressive agent for preventing organ rejection in xenotransplantation.