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Correlation between classification of human urothelial cell lines and HLA-A,B,C expression
S S Ottesen1, V Tromholt, J Kieler
1Fibiger Institute, Danish Cancer Society, Copenhagen, Denmark.
Cancer Immunology, Immunotherapy : CII
|January 1, 1988
Summary
Tumor cells with lower expression of human leukocyte antigen (HLA) class I and beta-2 microglobulin are more likely to be tumorigenic. Neuraminidase treatment partially restored HLA expression, suggesting masking by glycoconjugates.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Major histocompatibility complex (MHC) class I antigen expression on tumor cells influences the host immune response.
- Tumorigenic human urothelial cell lines (TGrIII) exhibit reduced polymorphic HLA-A,B epitopes.
- Understanding quantitative antigen expression is crucial for cancer immunotherapy.
Purpose of the Study:
- To investigate the quantitative expression of monomorphic HLA-A,B,C and beta-2 microglobulin in human urothelial cell lines.
- To determine the correlation between tumor cell expression of these antigens and their tumorigenicity.
- To explore potential mechanisms behind altered antigen expression in tumor cells.
Main Methods:
- Quantitative analysis of HLA-A,B,C and beta-2 microglobulin expression in 3 non-tumorigenic (TGrII) and 6 tumorigenic (TGrIII) human urothelial cell lines.
- Treatment of cell lines with neuraminidase to assess its effect on antigen expression.
- Comparison of antigen expression levels between different cell lines based on their tumorigenicity.
Main Results:
- An inverse correlation was observed between tumorigenicity and the expression of HLA-A,B,C and beta-2 microglobulin.
- Neuraminidase treatment partially restored the expression of monomorphic HLA-A,B,C antigens.
- Findings suggest that sialic acid-containing glycoconjugates may mask cell surface HLA antigens.
Conclusions:
- Reduced expression of HLA class I antigens and beta-2 microglobulin is associated with increased tumorigenicity in human urothelial cells.
- Masking of HLA antigens by glycoconjugates is a potential mechanism contributing to decreased surface expression.
- These alterations in antigen presentation may impact immune surveillance and tumor evasion.