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Mitogenic signal transduction: a common target for oncogenes that induce resistance to ionizing radiations
M Ruggiero1, F Casamassima, L Magnelli
1Lab. of Mol. Biol., Univ. of Firenze, Italy.
Abstract:
We hypothesized that resistance to ionizing radiations accompanying neoplastic transformation caused by some oncogenes was due to common biochemical pathways affecting the mechanism of mitogenic signal transduction. In order to verify this hypothesis, we studied the formation of mitogenic second messengers in cells transformed by oncogenes that induce radioresistance. We observed an increase of diacylglycerol which activates protein kinase C, an increase of phosphatidylcholine metabolism, with a concomitant decrease of inositol lipid metabolism. Our data show that sensitivity to ionizing radiations was inversely related to the intracellular level of diacylglycerol; study of signalling alterations in spontaneous tumors could provide predictive indications about the responsiveness of neoplasia to radiation therapy.
Insights
Oncogene-induced radioresistance in cancer is linked to altered cell signaling. Increased diacylglycerol levels correlate with radiation resistance, suggesting potential predictive markers for radiation therapy effectiveness.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Neoplastic transformation driven by oncogenes can confer resistance to ionizing radiation.
- Mitogenic signal transduction pathways may play a role in this radioresistance.
- Understanding these pathways is crucial for improving cancer radiation therapy.
Purpose of the Study:
- To investigate the biochemical pathways involved in oncogene-induced radioresistance.
- To examine the role of mitogenic second messengers in radiation sensitivity.
- To determine if intracellular diacylglycerol levels can predict radiation response.
Main Methods:
- Studied mitogenic second messenger formation in oncogene-transformed cells.
- Analyzed phosphatidylcholine and inositol lipid metabolism.
- Correlated intracellular diacylglycerol levels with sensitivity to ionizing radiation.
Main Results:
- Observed increased diacylglycerol and phosphatidylcholine metabolism in radioresistant cells.
- Noted a decrease in inositol lipid metabolism.
- Found an inverse relationship between intracellular diacylglycerol levels and ionizing radiation sensitivity.
Conclusions:
- Altered mitogenic signal transduction, specifically increased diacylglycerol, contributes to oncogene-induced radioresistance.
- Intracellular diacylglycerol levels may serve as a predictive biomarker for radiation therapy responsiveness in tumors.