title: Specificity of cell surface virus receptors on radiation leukemia virus and radiation-induced thymic lymphomas.
abstract: We have developed a system for analysis of murine leukemic virus (MuLV) receptors on the surface of thymic lymphoma cells utilizing the fluorescence-activated cell sorter. The binding of fluoresceinated or rhodaminated MuLV to target cells showed saturation kinetics and was blocked by homologous MuLV, and bound MuLV had a polypeptide profile identical to that of input MuLV. Thymic lymphomas bound specifically the MuLV which induced them, whereas only 0.5 to 2% of normal thymocytes showed equivalent MuLV binding. Simultaneous binding of excess fluoresceinated RadLV and rhodaminated MCF-247 AKR virus to radiation leukemia virus-induced or spontaneous AKR thymic lymphomas demonstrated that even in the presence of both viruses the cells bound preferentially the inducing MuLV. Examination of the C57BL/Ka endogenous viruses showed that radiation leukemia virus-induced thymic lymphomas bind only thymotropic-leukemogenic radiation leukemia virus and not eco- or xenofibrotropic MuLV's. Thus, virus binding in this system involves only leukemogenic isolates of these retroviruses and implies a central role of this receptor-ligand interaction in the processes of leukemic transformation.
mesh_terms: D002460:Cell Line; D007700:Kinetics; D009052:Leukemia Virus, Murine / Q000378:metabolism*; D008223:Lymphoma / Q000209:etiology / Q000378:metabolism / Q000382:microbiology*; D011991:Receptors, Virus / Q000378:metabolism*; D013601:T-Lymphocytes / Q000382:microbiology; D014965:X-Rays
chemical_list: D011991:Receptors, Virus