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Changes in sensitivity of human tumour cells to growth inhibition by proteinase inhibitors
Abstract:
Inhibition of a cell-surface proteinase can inhibit the growth of many normal human cell types in culture. Some tumour cells are also sensitive to proteinase inhibitors, but others are resistant, and continue to grow in the presence of these inhibitors. Here we describe two human tumour cell lines which convert from the sensitive to the resistant state. In one case, the conversion occurs during routine passaging, but, in the other, it is determined by growth conditions, and is reversible.
Insights
Certain human tumor cells can switch from being sensitive to proteinase inhibitors to resistant. This resistance can occur during cell culture or be reversible depending on growth conditions.
Area of Science:
- Cell Biology
- Cancer Research
- Biochemistry
Background:
- Cell-surface proteinase inhibition affects normal human cell growth in culture.
- Tumor cells exhibit varied sensitivity to proteinase inhibitors; some are inhibited, while others develop resistance.
Purpose of the Study:
- To investigate the mechanisms by which human tumor cell lines transition from proteinase inhibitor sensitivity to resistance.
- To characterize the conditions influencing this phenotypic conversion in vitro.
Main Methods:
- Culturing and passaging of two distinct human tumor cell lines.
- Exposure to proteinase inhibitors under varying growth conditions.
- Monitoring and assessment of cell growth and inhibitor sensitivity.
Main Results:
- Two human tumor cell lines were observed to convert from a sensitive to a resistant state regarding proteinase inhibitors.
- In one cell line, this conversion occurred spontaneously during routine passaging.
- In the second cell line, the conversion was dependent on specific growth conditions and was found to be reversible.
Conclusions:
- Human tumor cell lines can acquire resistance to proteinase inhibitors.
- The development of resistance can be influenced by cell culture conditions and may be a dynamic, reversible process.