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An immunohistological study of human lymphoma
Clinical and Experimental Immunology
|May 1, 1980
Summary
Investigating immunoglobulin staining in human lymphoma, this study found mercury-based fixatives prevent masking and non-specific protein uptake. This improves accurate diagnosis of monoclonal immunoglobulin in non-Hodgkin's lymphoma.
Area of Science:
- Immunology
- Pathology
- Histology
Background:
- Immunoglobulin (Ig) staining in paraffin-embedded human lymphoma presents technical challenges.
- Formol saline fixation masks cytoplasmic Ig, leading to inaccurate staining results.
- Non-specific protein uptake can be mistaken for specific Ig labeling in lymphoma cells.
Purpose of the Study:
- To investigate and overcome problems in immunoglobulin staining of human lymphoma.
- To differentiate specific Ig labeling from non-specific protein uptake.
- To accurately characterize Ig expression in non-Hodgkin's lymphoma and Hodgkin's disease.
Main Methods:
- Comparison of mercury-based fixatives versus formol saline for Ig staining.
- Utilizing double immunoenzymatic labeling (alkaline phosphatase and peroxidase).
- Direct immunofluorescent labeling of cryostat sections for comparison.
Main Results:
- Mercury-based fixatives prevent cytoplasmic Ig masking.
- Non-specific serum protein uptake is a common artifact in lymphoma samples.
- Monoclonal Ig labeling was confirmed in 7/16 non-Hodgkin's lymphoma cases (IgM with single light chain).
- IgG in Reed-Sternberg/Hodgkin's cells was specific, supporting macrophage origin.
Conclusions:
- Mercury-based fixatives are superior for accurate Ig staining in lymphoma.
- Careful methodology is required to avoid artifacts in immunoperoxidase staining.
- Findings support the macrophage origin of Hodgkin's disease cells.