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Related Experiment Videos

Allelic complementation between MHC haplotypes B(Q) and B17 increases regression of Rous sarcomas.

H L Senseney1, W E Briles, H Abplanalp

  • 1Department of Animal and Nutritional Sciences, University of New Hampshire, Durham 03824, USA.

Poultry Science
|February 24, 2001
PubMed
Summary
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The study found that specific Major Histocompatibility (B) complex genotypes in chickens influenced Rous sarcoma virus (RSV) tumor growth. Heterozygous B(Q)B17 chickens showed better tumor regression at lower RSV doses, indicating a potential immune response complementation.

Area of Science:

  • Immunogenetics
  • Viral Oncology
  • Avian Biology

Background:

  • The Major Histocompatibility (B) complex plays a crucial role in immune responses.
  • Rous sarcoma virus (RSV) is a well-established model for studying tumor development and immune evasion.

Purpose of the Study:

  • To investigate the impact of specific Major Histocompatibility (B) complex haplotypes (B(Q) and B17) on the outcome of Rous sarcoma virus infection in chickens.
  • To determine if genetic complementation occurs in heterozygous B(Q)B17 chickens regarding tumor growth and regression.

Main Methods:

  • Pedigree matings were used to generate chickens with B(Q)B(Q), B(Q)B17, and B17B17 genotypes.
  • Chickens were inoculated with different doses of subgroup A Rous sarcoma virus (RSV).
  • Tumor size was monitored over 10 weeks, and a tumor profile index (TPI) was calculated.

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Main Results:

  • At a high RSV dose (30 pfu), no significant effect of B genotype on tumor growth was observed.
  • At a lower RSV dose (15 pfu), B genotype significantly affected tumor growth patterns.
  • Heterozygous B(Q)B17 chickens exhibited a lower TPI, indicating more tumor regression compared to homozygous B17B17 and B(Q)B(Q) genotypes.

Conclusions:

  • The Major Histocompatibility (B) complex genotype influences the chicken's immune response to Rous sarcoma virus.
  • Genetic complementation in B(Q)B17 heterozygotes enhances tumor regression under moderate viral challenge.
  • These findings highlight the role of MHC in modulating immune responses to viral oncogenesis.