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. 1990 Aug;64(8):3701–3711. doi: 10.1128/jvi.64.8.3701-3711.1990

Combined infection by Moloney murine leukemia virus and a mink cell focus-forming virus recombinant induces cytopathic effects in fibroblasts or in long-term bone marrow cultures from preleukemic mice.

Q X Li 1, H Fan 1
PMCID: PMC249664  PMID: 2164592

Abstract

We described previously a preleukemic state in mice inoculated with Moloney murine leukemia virus (M-MuLV) characterized by generalized hematopoietic hyperplasia in the spleen. To investigate this further, long-term bone marrow cultures (LTBMC) from preleukemic mice were established. Surprisingly, LTBMC from M-MuLV-inoculated preleukemic mice showed less hematopoiesis than LTBMC from control mice. This resulted from a quantitative defect in establishment of bone marrow stromal cells in the LTBMC. This phenomenon could also be observed in LTBMC from normal mice infected in vitro with a stock of M-MuLV containing a mink cell focus-forming virus (MCF) derivative (M-MCF), but not in LTBMC infected with M-MuLV alone. This implicated MCF derivatives in the reduction in bone marrow stromal cells. The phenomenon could also be detected in infected NIH 3T3 cells. Combined infection of M-MuLV plus M-MCF resulted in fewer cells, in comparison to uninfected cells or cells infected with either virus alone. Further studies indicated that this was predominantly due to an inhibition in cell growth rather than to cell lysis. The cytopathic effect did not appear to result from overreplication of viral DNA, as measured by Southern blots. Thus, combined infection with M-MuLV and an MCF derivative had cytostatic effects on cell growth. This phenomenon might also contribute to the leukemogenic process in vivo.

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