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Polyamine metabolism and interconversion in NIH 3T3 and ras-transfected NIH 3T3 cells
R Pakala1, M Kreisel, U Bachrach
1Department of Molecular Biology, Hebrew University-Hadassah Medical School, Jerusalem, Israel.
Cancer Research
|June 15, 1988
Summary
The human ras oncogene increases spermidine uptake and interconversion in NIH 3T3 cells. Ras-transfected cells also excrete acetylpolyamines, unlike normal cells.
Area of Science:
- Molecular Biology
- Cell Biology
- Oncology
Background:
- The ras oncogene plays a critical role in cell signaling pathways.
- Polyamines are essential for cell growth and proliferation.
- Altered polyamine metabolism is a hallmark of cancer cells.
Purpose of the Study:
- To investigate the impact of the human ras (c-Ha-ras-1) oncogene transfection on polyamine metabolism in NIH 3T3 cells.
- To analyze the effects on polyamine uptake, interconversion, and excretion.
Main Methods:
- NIH 3T3 cells were transfected with the human c-Ha-ras-1 oncogene.
- Quantification of polyamine uptake and interconversion.
- Analysis of polyamine excretion into the cell medium.
Main Results:
- Ras-transfected cells exhibited higher uptake and interconversion of spermidine compared to control NIH 3T3 cells.
- Acetylpolyamines were excreted into the medium by ras-transfected cells.
- NIH 3T3 cells retained acetylpolyamines, and ras-transfected cells showed unknown polyamine conjugates.
Conclusions:
- The c-Ha-ras-1 oncogene significantly alters polyamine metabolism in NIH 3T3 cells.
- Ras oncogene expression promotes the excretion of acetylpolyamines.
- Changes in polyamine handling by ras-transfected cells may contribute to cellular transformation.