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Differential effects of glycoprotein processing inhibition on experimental metastasis formation by T24-H-ras
M A Spearman1, J E Damen, T Kolodka
1Manitoba Institute of Cell Biology, University of Manitoba, Winnipeg, Canada.
Abstract:
Highly metastatic mouse 10T1/2 cell lines (Ciras 2, Ciras 3 and dGC2M5) which have been T24-H-ras transfected, are shown to have differential responses in metastatic properties when grown in the presence of the processing inhibitors, swainsonine, castanospermine and deoxymannojirimycin. Concanavalin A binding data indicated the inhibitors caused similar shifts in oligo-saccharide structures, resulting in more high mannose character for all cell lines. However, swainsonine inhibited the experimental metastasis of dGC2M5, but did not affect the metastatic properties of Ciras 2 and Ciras 3. Inversely, castanospermine reduced experimental metastasis of Ciras 2 and 3 and did not inhibit dGC2M5. These results show that closely related metastatic cell lines respond differently in their metastatic ability when changes occur in N-linked oligosaccharide content. This observation emphasizes the importance of oligosaccharide structure in the malignant phenotype and indicates that some caution should be used when generalizing about the effects of processing inhibitors on a complex process like metastasis.
Insights
Highly metastatic cancer cell lines exhibit varied responses to oligosaccharide processing inhibitors. This highlights the critical role of N-linked oligosaccharide structure in cancer metastasis and suggests caution when applying these inhibitors broadly.
Area of Science:
- Oncology
- Glycobiology
- Molecular Biology
Background:
- Metastasis is a complex process influenced by cell surface glycoproteins.
- N-linked oligosaccharides play a role in the malignant phenotype.
- Understanding how specific oligosaccharide structures affect metastasis is crucial.
Purpose of the Study:
- To investigate the differential effects of N-linked oligosaccharide processing inhibitors on the metastatic properties of highly metastatic mouse cell lines.
- To determine if closely related cell lines exhibit similar or distinct responses to these inhibitors.
- To elucidate the importance of specific oligosaccharide structures in mediating cancer cell metastasis.
Main Methods:
- Utilized T24-H-ras transfected 10T1/2 mouse cell lines (Ciras 2, Ciras 3, and dGC2M5) with high metastatic potential.
- Administered processing inhibitors: swainsonine, castanospermine, and deoxymannojirimycin.
- Assessed changes in oligosaccharide structure using Concanavalin A binding assays.
- Quantified experimental metastasis in vivo.
Main Results:
- All tested inhibitors induced similar shifts towards high mannose oligosaccharide structures across all cell lines.
- Swainsonine inhibited metastasis in dGC2M5 cells but not in Ciras 2 or Ciras 3 cells.
- Castanospermine inhibited metastasis in Ciras 2 and Ciras 3 cells but not in dGC2M5 cells.
- Deoxymannojirimycin's effect was not explicitly detailed but implied differential response.
Conclusions:
- Closely related metastatic cell lines can display divergent responses to N-linked oligosaccharide processing inhibitors.
- Specific N-linked oligosaccharide structures are critical determinants of metastatic capability.
- Generalizing the effects of processing inhibitors on metastasis requires careful consideration of cell-specific responses.