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Related Experiment Videos

Hereditary C3 hypocomplementemia in the rabbit.

M Komatsu1, K Yamamoto, Y Nakano

  • 1Department of Animal Breeding and Genetics, National Institute of Animal Industry, Tsukuba, Ibaraki, Japan.

Immunology
|July 1, 1988
PubMed
Summary
This summary is machine-generated.

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Hereditary hypocomplementemia of the third component of complement (C3) in rabbits is a co-dominant trait. These rabbits exhibit reduced C3 levels, impacting survival and bactericidal activity.

Area of Science:

  • Immunology
  • Genetics

Background:

  • Hereditary hypocomplementemia of the third component of complement (C3) was identified in a rabbit strain.
  • This strain also exhibited hereditary C8 alpha-gamma deficiency.

Purpose of the Study:

  • To characterize the hereditary C3 hypocomplementemia in rabbits.
  • To investigate the genetic transmission and functional consequences of this condition.

Main Methods:

  • Quantification of serum C3 concentration, C3 hemolytic activity, and total hemolytic activity (CH50).
  • Functional assays involving addition of purified C3.
  • Analysis of other complement components and factors.
  • Genetic mating tests and survival studies.
  • Assessment of bactericidal activity.

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Main Results:

  • C3-hypocomplementemic (C3-hypo) rabbits showed significantly reduced C3 levels (6-12%) and hemolytic activity (8-13%), with CH50 at 27-37% of normal.
  • Hemolytic activity was restored by adding purified C3, indicating a deficiency in C3 itself.
  • Levels of factors H, properdin, C2, and C6 were normal; factors B, D, and C8 were elevated.
  • Low C3 levels were not due to conversion, inhibitors, or hypercatabolism.
  • C3 hypocomplementemia is inherited as an autosomal co-dominant trait.
  • C3-hypo rabbits had lower survival rates and reduced serum bactericidal activity.

Conclusions:

  • Hereditary C3 hypocomplementemia in rabbits is a distinct genetic trait.
  • This condition leads to impaired immune function, evidenced by reduced bactericidal activity and lower survival.
  • The C8 deficiency in this strain does not influence C3 levels or catabolism.