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Journal of Virology, December 1999, p. 10079-10085, Vol. 73, No. 12
Department of Pathology, Harvard Medical
School, Boston, Massachusetts 02115
Received 18 June 1999/Accepted 25 August 1999
Polyomavirus induces a broad array of tumors when introduced into
newborn mice of certain standard inbred strains, notably those bearing
the H-2k haplotype. Susceptibility in these
mice is conferred by an endogenous mouse mammary tumor virus
superantigen (Mtv-7 sag) that acts to delete T cells
required for polyomavirus-induced tumor immunosurveillance. In the
present study we show that mice of two wild-derived inbred strains,
PERA/Ei (PE) and CZECH II/Ei (CZ), are highly susceptible to
polyomavirus but carry no detectable Mtv sag-related sequences and show
no evidence of V
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Wild-Derived Inbred Mice Have a Novel Basis of
Susceptibility to Polyomavirus-Induced Tumors
deletion. C57BR/cdJ (BR) mice, which are
H-2k but lack the endogenous Mtv-7, are highly
resistant based on an effective anti-polyomavirus tumor immune
response. When crossed with BR, both PE and CZ mice transmit their
susceptibility in a dominant fashion, indicating a mechanism(s) that
overrides the immune response of BR. Susceptibility in PE and CZ mice
is not based on interference with antigen processing or presentation since cytotoxic T cells from BR can efficiently kill
F1-derived tumor cells in vitro. The expected precursors of
polyomavirus-specific cytotoxic T cells are present in both the wild
inbred animals and their F1 progeny. These findings
indicate a novel basis of susceptibility that operates independently of
endogenous superantigen and prevents the development of tumor immunity.
*
Corresponding author. Mailing address: Department of
Pathology, Harvard Medical School, 200 Longwood Ave., Boston, MA 02115. Phone: (617) 432-1960. Fax: (617) 277-5291. E-mail:
Thomas_Benjamin{at}hms.harvard.edu.
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