Isolation of paralysis-inducing murine leukemia viruses from Friend virus passaged in rats.
Four clones of murine leukemia viruses (PVC-111, PVC-211, PVC-321, and PVC-441) were isolated from a paralyzed Fischer rat which had been infected with rat-passaged Friend leukemia virus. PVC-211 and PVC-321 viruses induced hind leg paralysis in rats and killed them within 1 month, and PVC-441 did so within 2 months after infection, whereas PVC-111 did not within 4 months. PVC-321 and PVC-441 but not PVC-111 virus grew well in brain and spinal cord media. The viral antigens were found often in glia cells and rarely in neurons of the rats infected with each of these PVC viruses. All of the PVC viruses induced neuronal degeneration but neither inflammation nor leukemic infiltration in the spinal cord. The isolated viruses were all ecotropic and NB-tropic. Age dependency of the susceptibility of rats to paralysis induction was observed.
13 references, click to expand
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