Abstract
From 40 discrete mouse tissue culture cell lines examined by electron microscopy or complement fixation, or both, for the presence of detectable virus, one (NCTC 4705), initiated and maintained on chemically defined medium, was chosen for a more extensive study. Virus-like particles (100 to 110 mμ), morphologically similar to previously reported immature and mature C-type leukemia virus particles, were found budding from the plasma membrane and free in the intracellular spaces of cells in tissue culture and in fibrosarcomas resulting from intramuscular implants of these tissue cultures. Complement-fixation tests for group reactive murine leukemia antigens were positive, with titers consistently higher to a broadly reactive anti-serum than to anti-Friend, anti-Moloney, or anti-Rauscher sera. The 4705 virus was neutralized by Gross antiserum, but not by the F-M-R antisera. When injected into DD, BALB/c, or C3H/He newborn mice, the virus thus far has manifested no leukemogenicity, though virus from tumor extracts and tissue culture medium has been shown to be capable of infecting C3H and Swiss mouse embryo tissue cultures and successfully replicating in them. The role of the virus in accelerating or inducing neoplastic transformation in NCTC 4705 is still not known. When it was introduced into NCTC [ill], a non-neoplastic cell line in other respects similar to NCTC 4705, 4823 manifested no signs of neoplastic transformation after harboring the virus more than 300 days in vitro.
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