Resistance to Marek's Disease Herpesvirus-induced Lymphoma is Multiphasic and Dependent on Host Genotype
Genotype-dependent differences in Marek's disease (MD) susceptibility were identified using 14-day-old line N and 61 (resistant) and 15I and 72 (susceptible) inbred chickens infected with HPRS-16 MD virus (MDV). All line 72 chickens developed progressive MD. Line 15I had fluctuating MD-specific...
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Published in | Veterinary pathology Vol. 38; no. 2; pp. 129 - 142 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Los Angeles, CA
SAGE Publications
01.03.2001
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Subjects | |
Online Access | Get full text |
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Summary: | Genotype-dependent differences in Marek's disease (MD) susceptibility were identified
using 14-day-old line N and 61 (resistant) and 15I and 72
(susceptible) inbred chickens infected with HPRS-16 MD virus (MDV). All line
72 chickens developed progressive MD. Line 15I had fluctuating
MD-specific clinical signs and individuals recovered. A novel histologic scoring
system enabled indices to be calculated for lymphocyte infiltration into nonlymphoid
organs. All genotypes had increased mean lesion scores (MLSs) and mean total lesion
scores after MDV infection. These differed quantitatively and qualitatively between
the genotypes. Lines 61 and 72 had a similar MLS distribution
in the cytolytic phase, although scores were greater in line 72. At the
time lymphomas were visible in line 72, histologic lesions in line
61 were regressing. AV37+ cells were present in similar
numbers in all genotypes in the cytolytic phase, suggesting that neoplastically
transformed cells were present in all genotypes regardless of MD susceptibility.
After the cytolytic phase, AV37+ cell numbers increased in lines
72 and 15I but decreased in lines 61 and N. In the cytolytic
and latent phases, in all genotypes, most infiltrating cells were CD4+.
After this time, line 72 and 15I lesions increased in size and most cells
were CD4+; line 61 and N lesions decreased in size and most
cells were CD8+. In all genotypes, AV37 immunostaining was weak in lesions
with many CD8+ cells, suggesting that AV37 antigen expression or
AV37+ cells were controlled by CD8+ cells. The rank order,
determined by clinical signs and pathology, for MD susceptibility (highest to lowest)
was 72 > 15I > 61 > N. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0300-9858 1544-2217 |
DOI: | 10.1354/vp.38-2-129 |