Growth factor interactions between mouse mammary cell lines cocultured in collagen gels |
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Authors: | Steve Hamner Walis Jones Jean R Starkey Howard L Hosick |
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Institution: | (1) Department of Microbiology, Montana State University, Bozeman, Montana;(2) Department of Biochemistry, Molecular Sciences Division, Glaxo Group Research, Greenford, Middlesex, England;(3) Department of Zoology, Washington State University, 99164 Pullman, Washington |
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Abstract: | Summary Three related mouse mammary cell lines were cultured in collagen gels and assayed for growth factor responsiveness and interaction
via soluble factors. The CL-S1 cell line is nontumorigenic and grows poorly in collagen gel culture. The +SA and −SA cell
lines exhibit different degrees of malignant behavior in vivo and have different growth properties in vitro. In collagen gel
culture, +SA growth was stimulated by serum but not by epidermal growth factor (EGF), whereas both serum and EGF were required
for optimal growth of −SA cells of early passage number as well as CL-S1 cells. −SA cells of later passage repeatedly exhibited
a change so as to no longer require serum while retaining EGF responsiveness. 125I]EGF binding analyses indicated that CL-S1 cells bound EGF with less affinity than did −SA cells whereas +SA cells bound
almost to ligand. When cell lines were maintained in separate collagen gels but shared the same culture medium, growth of
+SA or −SA cells was slightly enhanced in the presence of CL-S1 cells and −SA cell growth was enhanced by the presence of
+SA cells. Using the normal rat kidney fibroblast line NRK (clone 49F) as an indicator, serum-containing conditioned media
from each cell line and from each pair of cell lines cultured in collagen gels were tested for transforming growth factor
(TGF) activity. Both the −SA and CL-S1 lines tested positive for TGF-α production and possibly released a TGF-β activity.
These results suggest mechanisms by which cell populations in and around tumors can modify one another’s growth characteristics.
The work was supported by a grant from the American Institute for Cancer Research, by American Cancer Society Institutional
grant IN-119, by funds from the Poncin Trust (Seattle-First National Bank), and by grants CA-39611 and CA46885 from the National
Institutes of Health, Bethesda, MD. |
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Keywords: | mammary cell lines collagen gel culture coculture transforming growth factors |
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