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J. Virol., 08 1997, 6044-6048, Vol 71, No. 8
Copyright © 1997, American Society for Microbiology

Both T and B cells shed infectious mouse mammary tumor virus

JL Dzuris, TV Golovkina and SR Ross
Department of Microbiology/Cancer Center, University of Pennsylvania School of Medicine, Philadelphia 19103-6142, USA.

Mouse mammary tumor virus (MMTV) infected both B and T tissue culture cells and primary B and T cells in vivo after milk-borne transmission of the virus. The infected tissue culture cells processed viral proteins, and both these and primary B and T cells shed virus when cultured in vitro. Moreover, the infected B and T tissue culture cells transmitted virus to uninfected mammary gland cells in vitro. The level of infection of these different cell types in vivo was dependent on the strain of mouse, with C3H/HeN mice showing greater B-cell infection and BALB/c mice greater T-cell infection after nursing on MMTV-infected C3H/HeN mothers. Although their B cells were less infected, BALB/c mice developed tumors more rapidly than C3H/HeN mice. These results indicate that both infected T and B cells are potential carriers of MMTV in vivo.

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