Increased yield of mouse mammary tumor virus (MMTV) by cultivation of monolayer-derived mammary tumor cells in suspension |
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Authors: | Frank Maldarelli Mary Jane Yagi |
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Institution: | (1) Department of Biochemistry, Mount Sinai School of Medicine, 10029 New York, New York;(2) Department of Neoplastic Diseases, Mount Sinai School of Medicine, Room 338/BSB, One Gustave L. Levy Place, 10029 New York, New York;(3) Cancer Center, Mount Sitnai School of Medicine, 10029 New York, New York |
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Abstract: | Summary The MJY-alpha epithelial-like mammary tumor cell line was adapted for cultivation in suspension using a shaker culture technique.
Replication of suspension (MJY-beta) cells was more sensitive than monolayer cells to decreases in the concentration of serum
in the medium. Comparison of amino acid incoerporation and lactate production rates revealed additional differences between
monolayer and suspension cultures. In addition, growth in susfpension resulted in 10- to 400-fold increases in mouse mammary
tumor virus (MMTV) production by the mammary tumor cells. Incrases in MMTV yield were detected within 48 h of culture initiation
and MMTV production remained elevated throughout 20 cell passages in suspension. Exposure of MJY-beta cells to 14 μM hydrocorticone further increased MMTV yield two-to five-fold. The MJY-beta suspension cultures demonstrated that these epithelial-like
cells do not require attachment to a solid substrate for replication or for MMTV production. Loss of structural polarization
associated with growth as a monolayer resulted in stimulation of MMTV production greater than and independent of steroid exposure.
This work was supported by the T. J. Martell Foundation for Cancer and Leukemia Research and by USPHS grant 5P-30CA23102.
F. M. is a trainee on MSTP grant GM07280 from the National Institute of Health. This work was submitted in partial fullfillment
of the requirements for the Ph. D. degree (F. M.). |
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Keywords: | MMTV-production mammary tumor cells suspension culture |
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