Co-reversion of a lectin-resistant mutation and non-metastatic phenotype in murine tumor cells
Abstract:
Three independent isolates, one obtained spontaneously and the others obtained after in vitro mutagenesis, of a WGA-resistant mutation were compared to the highly metastatic parental murine cell line MDAY-D2 for alterations in plasma membrane glycoproteins and changes in metastatic behavior. The mutants were non-metastatic from an s.c. site of injection and poor organ-colonizers when administered i.v. Each of the mutant lines had the same lesion in N-linked oligosaccharide structure, which rendered the cells hypersensitive to the N-acetylglucosamine-binding lectin BSII in vitro. The phenotypic similarities between the 3 WGA-resistant isolates indicated that the mutation was directly related to the attenuated malignant phenotype. Direct confirmation was obtained by the isolation of a BSII-resistant clone of the mutant cells that co-reverted for lectin-sensitivity, lectin binding glycoproteins and malignant aggressiveness. The results indicate a direct relationship between malignant behavior and cell-surface oligosaccharide structure.
Insights
This study reveals that changes in cell surface sugar structures, specifically N-linked oligosaccharides, directly impact cancer
Area of Science:
- Molecular Biology
- Cancer Research
- Glycobiology
Background:
- Metastasis is a complex process involving changes in cell surface glycoproteins.
- Understanding the molecular basis of metastasis is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the relationship between alterations in plasma membrane glycoproteins and metastatic behavior.
- To identify specific molecular changes associated with reduced metastatic potential.
Main Methods:
- Comparison of WGA-resistant mutant cell lines with a highly metastatic parental cell line (MDAY-D2).
- Analysis of N-linked oligosaccharide structure and lectin binding properties (BSII).
- Assessment of metastatic behavior following subcutaneous injection and intravenous administration.
Main Results:
- WGA-resistant mutants exhibited significantly reduced metastatic capabilities.
- A common defect in N-linked oligosaccharide structure was identified in all mutants.
- Mutant cells showed hypersensitivity to the lectin BSII.
- Reversion of lectin sensitivity in a BSII-resistant clone correlated with restored malignant aggressiveness.
Conclusions:
- Cell-surface oligosaccharide structure is directly linked to malignant behavior and metastatic potential.
- Specific alterations in N-linked glycosylation can attenuate cancer cell aggressiveness.
- Targeting cell-surface glycans represents a potential strategy for cancer therapy.
