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Thymosin modulation of suppressor function in mice and man.
Annals of the New York Academy of Sciences
|January 1, 1979
Summary
Thymosin therapy can reverse the immunosuppressive effects of tumor-growth-enhancing T-cells in mice and humans. This finding suggests thymosin may be a potential therapeutic agent for cancer by modulating suppressor cell function.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Tumor-bearing animals often exhibit enhanced suppressor cell activity, which can impede anti-tumor immune responses.
- Suppressor T-lymphocytes play a critical role in immune regulation and can be implicated in tumor progression.
Purpose of the Study:
- To investigate the effect of thymosin on suppressor-cell function in a murine tumor model and human lymphocytes.
- To determine if thymosin can counteract the immunosuppressive activity of tumor-associated suppressor T-cells.
Main Methods:
- In vivo studies utilized the Lewis murine tumor system to assess splenocyte and thymocyte function.
- In vitro experiments evaluated the impact of thymosin on human lymphocyte responses to various mitogens and in mixed lymphocyte cultures (MLC).
- Immunosuppressive cell activity was characterized using anti-Thy 1-2 antiserum, corticosteroids, and irradiation.
Main Results:
- Splenocytes and thymocytes from tumor-bearing mice enhanced tumor growth, an effect dependent on T-cells and sensitive to corticosteroids/irradiation, indicating suppressor T-cell activity.
- Thymosin (fraction 5) treatment abrogated the tumor-growth-enhancing effect of T-lymphocytes in mice, significantly decreasing tumor growth.
- In human systems, thymosin fraction 5 blocked the Concanavalin A (Con A)-stimulated lymphocyte-mediated suppression of normal lymphocyte responses.
Conclusions:
- Thymosin effectively modulates suppressor T-cell function, reversing their immunosuppressive effects in both murine and human systems.
- These findings highlight thymosin's potential as an immunotherapeutic agent for cancer by restoring anti-tumor immunity through the inhibition of suppressor cells.