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J. Virol., Jun 1996, 3734-3740, Vol 70, No. 6
PG Auwaerter, H Kaneshima, JM McCune, G Wiegand and DE Griffin
Mortality from measles is caused mostly by secondary infections associated
with the depression of cellular immunity. The mechanism of immune
suppression and the role of virus strain differences on the immune system
are incompletely understood. SCID-hu mice were used to determine the
effects of virulent, wild-type (Chicago-1) and avirulent, vaccine (Moraten)
strains of measles virus (MV) on the human thymus in vivo. Chicago-1
replicated rapidly, with a 100-fold decrease in numbers of thymocytes,
whereas Moraten replicated slowly, without significant thymocyte death.
Productive MV infection occurred not in thymocytes but in thymic epithelial
and myelomonocytic cells. Wild-type MV infection of thymic stromata leads
to induction of thymocyte apoptosis and may contribute to a long-term
alteration of immune responses. The extent of thymic disruption reflects
the virulence of the virus, and therefore the SCID-hu mouse may serve as
the first small animal model for the study of MV pathogenesis.
Copyright © 1996, American Society for Microbiology
Measles virus infection of thymic epithelium in the SCID-hu mouse leads to thymocyte apoptosis
Department of Medicine, John Hopkins University School of Medicine, Baltimore, Maryland 21287, USA.
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