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A response of Panc-1 cells to cis-platinum, assessed with a cDNA array
K M Anderson1, W A Alrefai, C A Anderson
1Department of Medicine, Rush Medical College, Chicago, IL 60612, USA. Kanderso@rush.edu
Background:
The problem posed by the lack of response of cells in most solid cancers to current chemotherapy generally remains intractable.
Materials And Methods:
The use of cDNA arrays represents one global approach to identifying reasons for this failure. A messenger RNA response of pancreatic cancer (Panc-1) cells after culture for 24 hours with 12 microM cis-platinum was analyzed with a commercial cDNA array.
Results:
Major drug-induced events included inhibition of messenger RNAs associated with cell proliferation and up-regulation of generally countervailing DNA repair, cellular stress, heat shock protein, glutathione stress-related and multiple drug resistance enzyme messenger RNAs, accompanied by a limited programmed cell death response.
Conclusion:
Induction of widespread normal stress-induced countervailing mRNAs by comparatively non-selective agents such as cis-platinum strongly biases against a successful therapeutic outcome. This paradoxical result of a therapeutic intent provides a further compelling argument for the use of specifically-targeted therapy such as growth factor receptor, tyrosine kinase and other discretely focused agents, probably employed in combinations based on expression of their targets in an individual patient's cancer, as identified by cDNA or proteonomic arrays.
Insights
Chemotherapy resistance in solid cancers is a major challenge. Cis-platinum treatment induced counteracting cellular stress responses, limiting therapeutic effectiveness and highlighting the need for targeted cancer therapies.
Area of Science:
- Oncology
- Molecular Biology
- Genomics
Background:
- Most solid cancers exhibit resistance to conventional chemotherapy, posing a significant clinical challenge.
- Understanding the molecular mechanisms underlying chemotherapy resistance is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the cellular and molecular response of pancreatic cancer cells (Panc-1) to cis-platinum treatment.
- To identify key messenger RNA (mRNA) changes associated with drug resistance using cDNA arrays.
Main Methods:
- Pancreatic cancer cells (Panc-1) were cultured with cis-platinum (12 microM) for 24 hours.
- Messenger RNA (mRNA) expression profiles were analyzed using commercial cDNA arrays.
Main Results:
- Cis-platinum treatment inhibited mRNAs related to cell proliferation.
- Upregulation of mRNAs involved in DNA repair, cellular stress, heat shock proteins, glutathione S-transferase, and multidrug resistance was observed.
- A limited programmed cell death response was detected.
Conclusions:
- Non-selective agents like cis-platinum induce countervailing stress responses, hindering therapeutic success.
- Targeted therapies, such as growth factor receptor or tyrosine kinase inhibitors, are more promising.
- Personalized combination therapies based on individual cancer's target expression, identified via cDNA or proteomic arrays, are recommended.