Related Experiment Videos
Expression of interferon-gamma receptors on bladder cancer cells: does it correlate with biological response?
S J Hawkyard1, A M Jackson, R A Hawkins
1Department of Surgery/Urology, Western General Hospital, UK.
Abstract:
Previously we have shown a differential biological response of three human bladder cancer cell lines (RT4, RT112 and MGH-U1) to gamma interferon (IFN-gamma). The present study examines the relationship between the biological response and the expression of the interferon-gamma receptor on the tumour cell surface. Using a competitive radioligand binding assay and Scatchard analysis, we measured the number and affinity of the IFN-gamma receptors on each of the above cell lines. Individual cells from each line expressed large numbers (29,100-41,800) of high-affinity receptors (kd = 2.4-3.9 x 10(10) M). There was no statistically significant difference in either of these parameters between the three lines. We therefore conclude that the biological response of these bladder lines to IFN-gamma does not relate to the number or affinity of its receptor on the plasma membrane of these tumour cells.
Insights
Bladder cancer cells respond differently to interferon-gamma (IFN-gamma). However, this study found no difference in the number or affinity of IFN-gamma receptors on these tumor cells, suggesting receptor levels do not explain varied responses.
Area of Science:
- Oncology
- Immunology
- Cell Biology
Background:
- Human bladder cancer cell lines (RT4, RT112, MGH-U1) exhibit differential biological responses to gamma interferon (IFN-gamma).
- The role of interferon-gamma receptor (IFNGR) expression in mediating these varied responses remains unclear.
Purpose of the Study:
- To investigate the relationship between the biological response of bladder cancer cell lines to IFN-gamma and the expression of IFNGR on their surface.
- To quantify the number and affinity of IFNGR on RT4, RT112, and MGH-U1 cell lines.
Main Methods:
- Competitive radioligand binding assays were employed to study IFNGR.
- Scatchard analysis was utilized to determine receptor number and affinity.
- Three human bladder cancer cell lines (RT4, RT112, MGH-U1) were analyzed.
Main Results:
- All three cell lines expressed high numbers of high-affinity IFNGR (29,100–41,800 receptors/cell, Kd = 2.4–3.9 x 10^-10 M).
- No statistically significant differences in either receptor number or affinity were observed among the three cell lines.
- The expression levels of IFNGR did not correlate with the previously observed differential biological responses to IFN-gamma.
Conclusions:
- The number and affinity of IFN-gamma receptors on the plasma membrane of these bladder cancer cells do not account for their differential biological responses to IFN-gamma.
- Further research is needed to elucidate the mechanisms underlying the varied cellular responses to IFN-gamma in bladder cancer.