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Expression of proteins correlated with the unique cisplatin-sensitivity of testicular cancer
T W de Graaf1, S de Jong, E G de Vries
1Department of Internal Medicine, University Hospital Groningen, The Netherlands.
Abstract:
Cisplatin (CDDP) has a curative effect in approximately 80%, of patients with testicular cancer, in contrast to the frequent development of resistance in patients with small cell lung cancer and ovarian cancer, and to the natural resistance of colon cancer. At present it is unknown which factors explain the unique curability of testicular cancer. Since it is very likely that the absence or presence of specific proteins plays an important role in cellular sensitivity towards CDDP, we have screened the protein patterns of various human CDDP-sensitive cell lines and cell lines with acquired or intrinsic resistance to CDDP of testicular, lung and colon origin. The expression of several proteins appeared to correlate with in vitro CDDP sensitivity. The most striking difference found was a relative increase in expression lactate dehydrogenase (LDH) H-subunit expression in the germ cell lines. In testis and colon tumour samples some of these proteins, LDH-H included, also appeared to correlate with in vivo CDDP sensitivity. In the analysis of the mechanisms of drug-resistance, screening of the protein patterns of intrinsic sensitive and resistant cell lines could be a valuable approach.
Insights
Cisplatin (CDDP) effectively treats testicular cancer, unlike other cancers where resistance is common. Researchers identified protein expression patterns, including increased lactate dehydrogenase H-subunit, linked to CDDP sensitivity in testicular germ cells.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Cisplatin (CDDP) is a cornerstone chemotherapy for testicular cancer, achieving high cure rates.
- However, resistance to CDDP is a significant challenge in small cell lung cancer, ovarian cancer, and colon cancer.
- The molecular factors underlying testicular cancer's unique sensitivity to CDDP remain largely unknown.
Purpose of the Study:
- To investigate the role of protein expression patterns in cellular sensitivity and resistance to Cisplatin (CDDP).
- To identify specific proteins that correlate with CDDP sensitivity across different cancer types, particularly testicular cancer.
Main Methods:
- Screening of protein expression profiles in human cancer cell lines with varying sensitivities to CDDP (testicular, lung, colon).
- Analysis of protein expression in tumor samples (testis, colon) to correlate with in vivo CDDP sensitivity.
- Utilizing proteomic analysis to identify differential protein expression.
Main Results:
- Several proteins showed a correlation with in vitro CDDP sensitivity.
- A notable increase in lactate dehydrogenase (LDH) H-subunit expression was observed in testicular germ cell lines.
- LDH-H and other identified proteins also correlated with in vivo CDDP sensitivity in testicular and colon tumor samples.
Conclusions:
- Protein expression patterns, particularly LDH-H, are associated with CDDP sensitivity in testicular cancer.
- Proteomic screening of cell lines is a valuable approach for understanding mechanisms of drug resistance.
- These findings may contribute to developing strategies to overcome CDDP resistance in other cancers.