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Altered ganglioside expression in ras-oncogene-transformed cells
Y Suzuki1, K Hidari, M Matsumoto
1Department of Biochemistry, University of Shizuoka, School of Pharmaceutical Science.
Abstract:
Alteration of ganglioside composition in mouse BALB/3T3 cells transformed either by DNA transfection with viral K-, H-, or cellular H-ras oncogene, or by infection with the K-ras oncogene-carrying murine sarcoma virus (Ki-KSV) was studied using a highly sensitive thin-layer chromatography/enzyme immunostaining method. Marked common decreases in the content of GD3 ganglioside and the increase of its metabolic precursor GM3 were bound in BALB/3T3 cell lines transformed by either K- or H-ras oncogenes. Moreover, a common decrease or loss in the contents of "A" series ganglio-tetraose gangliosides such as GM1a and GD1a was also found in all transformed cell lines, indicating that the alteration of cellular glycosphingolipids by ras oncogenes apparently does not depend on the type of ras-concogenes (K- and H-ras).
Insights
Ras oncogenes alter cellular glycosphingolipid composition. Transformed cells showed decreased GD3 ganglioside and increased GM3, alongside reduced "A" series gangliosides, regardless of ras oncogene type.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Gangliosides are crucial glycosphingolipids involved in cell signaling and growth.
- Ras oncogenes are key drivers of cellular transformation and cancer development.
- Understanding oncogene-induced cellular changes is vital for cancer research.
Purpose of the Study:
- To investigate the impact of ras oncogenes on ganglioside composition in mouse BALB/3T3 cells.
- To determine if K-ras and H-ras oncogenes induce similar or distinct alterations in glycosphingolipids.
- To identify specific ganglioside changes associated with ras-mediated cellular transformation.
Main Methods:
- Utilized a sensitive thin-layer chromatography/enzyme immunostaining method for ganglioside analysis.
- Studied BALB/3T3 cells transformed by viral K-ras, cellular H-ras, or K-ras-carrying murine sarcoma virus (Ki-KSV).
- Quantified and compared ganglioside profiles between normal and transformed cell lines.
Main Results:
- Observed significant, common decreases in GD3 ganglioside content across all ras-transformed cell lines.
- Noted a corresponding increase in the metabolic precursor GM3 ganglioside.
- Found a general decrease or loss of "A" series ganglio-tetraose gangliosides (e.g., GM1a, GD1a) in transformed cells.
Conclusions:
- Ras oncogenes induce consistent alterations in ganglioside metabolism, independent of the specific ras oncogene (K-ras vs. H-ras).
- Changes in GD3 and "A" series gangliosides are hallmarks of ras-mediated cellular transformation.
- These findings contribute to understanding the molecular mechanisms of oncogenesis driven by ras proteins.