Tumor Cell Morphology and Resistance to Cytolysis
Author Information
Author(s): M.L. Neale, N. Matthews
Primary Institution: University of Wales College of Medicine
Hypothesis
The differences in colonial morphology of tumor cell lines are related to their susceptibility to cytolysis by tumor necrosis factor.
Conclusion
The study concludes that the inability of TNF-resistant mutants to incorporate fibronectin into the extracellular matrix is responsible for their tighter colony formation.
Supporting Evidence
- TNF-susceptible cells form large, loosely packed colonies, while TNF-resistant mutants form smaller, tightly packed colonies.
- Immunofluorescence studies revealed a fibrillar network in the ECMs of 'loose' lines which was absent in 'tight' lines.
- The study identified a 300 kDa protein in the ECMs of 'loose' lines, which was shown to be cellular fibronectin.
Takeaway
Some tumor cells can be killed by a substance called TNF, but others can become resistant. This study found that the shape of the tumor cells affects how well they can be killed, and that a protein called fibronectin plays a big role in this.
Methodology
The study compared the extracellular matrices of TNF-susceptible tumor cell lines with their resistant sublines using immunofluorescence and Western blotting.
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