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Monoclonal antibody ONS-M21 recognizes integrin alpha3 in gliomas and medulloblastomas
H Kishima1, K Shimizu, K Tamura
1Department of Neurosurgery, Osaka University Medical School, Suita, Japan.
Abstract:
The monoclonal antibody ONS-M21 recognizes an antigen found on the surface of glioma and medulloblastoma cells but does not react with the antigens of normal brain tissue. We purified and identified the 140-kDa protein by means of an antibody-binding affinity column. This 140-kDa antigen has sequences homologous to the amino-terminal region and five parts of the internal domain of integrin alpha3. When the integrin alpha3-related sequences was amplified and used to analyse the mRNA of glioma and medulloblastoma surgical specimens, the transcription level of integrin alpha3 mRNA appeared to be quantitatively correlated with the grade of malignancy. These findings suggest that the ONS-M21 antibody, which reacts with integrin alpha3, might be useful in the diagnosis of gliomas and medulloblastomas.
Insights
A new antibody, ONS-M21, targets a protein on glioma and medulloblastoma cells. This protein, integrin alpha3, correlates with tumor grade, suggesting ONS-M21
Area of Science:
- Neuro-oncology
- Molecular Biology
- Immunology
Background:
- Gliomas and medulloblastomas are primary brain tumors.
- Identifying specific biomarkers for these tumors is crucial for diagnosis and treatment.
Purpose of the Study:
- To identify and characterize a novel antigen recognized by the monoclonal antibody ONS-M21.
- To investigate the potential diagnostic utility of ONS-M21 in brain tumors.
Main Methods:
- Purification and identification of the ONS-M21 target antigen using antibody-binding affinity chromatography.
- Sequence homology analysis to identify the antigen.
- Quantitative analysis of integrin alpha3 mRNA levels in tumor specimens.
Main Results:
- The ONS-M21 antibody recognizes a 140-kDa protein expressed on glioma and medulloblastoma cells, but not normal brain tissue.
- The identified antigen shares sequence homology with integrin alpha3.
- Integrin alpha3 mRNA levels correlate with the malignancy grade of gliomas and medulloblastomas.
Conclusions:
- The ONS-M21 antibody targets integrin alpha3, a protein overexpressed in malignant brain tumors.
- Integrin alpha3 shows potential as a diagnostic marker for gliomas and medulloblastomas.
- The ONS-M21 antibody may aid in the diagnosis of these brain cancers.