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Immunosuppressive plasma factors in malignant disease
The Australian and New Zealand Journal of Surgery
|April 1, 1985
Summary
Plasma suppressive activity (PSA) is linked to alpha-2-macroglobulin (a2M) in healthy individuals and cancer patients. While a2M levels are similar across groups, its immunosuppressive function significantly increases in malignancy, suggesting a role in tumor immune evasion.
Area of Science:
- Immunology
- Biochemistry
- Oncology
Background:
- Plasma contains substances that can suppress immune responses.
- This immunosuppressive activity is observed in healthy states, benign diseases, and malignant conditions.
- Identifying these factors is crucial for understanding immune regulation in disease.
Purpose of the Study:
- To identify the specific factors responsible for plasma's immunosuppressive activity.
- To compare plasma suppressive activity (PSA) in healthy subjects, patients with benign diseases, and patients with malignant diseases.
- To investigate the role of alpha-2-macroglobulin (a2M) in mediating PSA.
Main Methods:
- Plasma samples were fractionated using gel filtration.
- The distribution of specific proteins within fractions was determined.
- In vitro electrophoretic tests measured the suppressive activity of plasma and fractions on lymphocytes.
Main Results:
- Plasma suppressive activity (PSA) was low in healthy subjects and benign disease patients, primarily associated with alpha-2-macroglobulin (a2M).
- PSA was significantly elevated in cancer patients, mainly linked to a2M, but also involving immune complexes, IgG, and small molecules.
- Plasma a2M concentrations were comparable across all groups, but its immunosuppressive potency varied significantly.
Conclusions:
- Plasma suppressive activity can be quantitatively measured.
- Alpha-2-macroglobulin (a2M) is a key immunoregulatory protein, particularly in cancer patients.
- The findings support a novel hypothesis regarding tumor-mediated immune suppression.