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. 1979 Dec;38(6):1132–1139. doi: 10.1128/aem.38.6.1132-1139.1979

In vitro production of Rauscher murine leukemia virus: influence of culture age on biological properties.

O R Robinson Jr, A Perry, G P Shibley, M de Maio
PMCID: PMC291257  PMID: 93428

Abstract

Large-scale production and concentration procedures have been standardized to study the biological properties of Rauscher leukemia virus produced from the high-passaged JLS-V9-H mouse bone marrow cell line. Virus produced early (days 4 to 6) in the harvest and refeed cycle contained higher levels of ribonucleic acid-directed deoxyribonucleic acid polymerase activity and was more infectious than Rauscher leukemia virus produced later (days 7 to 10) in the growth period. The peak of virus production as detected by physical assays (virus particle count, protein, and p30 antigen) was highest at day 6, whereas the optimum biological and ribonucleic acid-directed deoxyribonucleic acid polymerase activity occurred 24 h earlier. When product characterization values of each concentrate were adjusted to a specific activity (i.e., per milligram of protein) basis, virus particle counts averaged 4 x 10(11) through days 5 to 9, and the peak infectivity occurred at day 4, whereas ribonucleic acid-directed deoxyribonucleic acid polymerase activity was highest at day 4 (endogenous) and 5 (exogenous). Sodium dodecyl sulfate-polyacrylamide gel analysis revealed only slight differences in the polypeptide pattern of Rauscher leukemia virus harvested from cultures of varying age, although Rauscher leukemia virus produced between days 3 and 5 contained more glycoprotein than either earlier or later harvests.

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Selected References

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