The Fv-2r Resistance Gene in Mice: Its Effect on Spleen Colony Formation by Friend Virus-Transformed Cells23

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Abstract
To determine the mechanism by which the recessive Fv-2r gene confers complete resistance to spleen focus formation and to the induction of early splenomegaly characteristic of the Friend virus (FV) disease syndrome, we compared the parameters of FV infection in susceptible DBA/2 (D2) (Fv-1n, Fv-2S) and partially congenic D2.Fv-2r (Fv-1n, Fv-2r) mice. After infecting these mice with N-tropic FV complex, we followed the replication of spleen focus-forming virus (SFFV) and the generation of SFFV-transformed tumor colony-forming cells (CFC) in their spleens. By both parameters D2.Fv-2r mice were 20- to 100-fold less susceptible than DBA/2 controls, but the inhibition was only partial. Transplantation of washed spleen cells from SFFV-infected DBA/2 mice resulted In equal growth and recovery. of tumor CFC from both D2.Fv-2r and Fv-2S mice. However, these tumor cells grew as colonies in Fv-2S mice, whereas they grew diffusely in the spleens of D2.Fv-2r hosts and did not develop into macroscopically or microscopically visible colonies. Thus the completeness of the resistance to spleen focus formation that defines the Fv-2r gene was reflected only in the complete suppression of the colonial growth of tumor cells, whereas the other parameters of infection showed no or only partial inhibition.