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Published on: November 16, 2016
Interferon exerts a cytotoxic effect on primary human myeloma cells
S Einhorn1, J O Fernberg, D Grandér
1Radiumhemmet, Karolinksa Hospital, Stockholm, Sweden.
European Journal of Cancer & Clinical Oncology
|September 1, 1988
Summary
Interferon (IFN) demonstrates a cytotoxic effect on human myeloma cells, reducing their viability. This anti-myeloma activity is independent of proliferation inhibition and immune cell involvement.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Multiple myeloma is a cancer of plasma cells.
- Interferons (IFNs) are cytokines with antiviral and immunomodulatory functions.
- Understanding IFN's effect on myeloma cells is crucial for potential therapies.
Purpose of the Study:
- To investigate the sensitivity of primary human myeloma and normal bone marrow cells to various types of interferon (IFN).
- To determine the mechanism by which IFN affects myeloma cell viability, differentiating between cytotoxic and antiproliferative effects.
Main Methods:
- Dye exclusion method to assess cell viability.
- Incubation of primary human myeloma and normal bone marrow cells with natural and recombinant IFNs (alpha, beta, gamma).
- Measurement of [3H]thymidine uptake to evaluate cell proliferation.
- Depletion of immune cells (T-cells, NK-cells, macrophages) to assess their role.
Main Results:
- Natural IFN-alpha significantly reduced viable myeloma cells (>90%) in some patients, with variable sensitivity observed.
- IFNs also decreased viable non-malignant bone marrow cells (10-60%).
- IFN's effect on myeloma cells was not due to proliferation inhibition, as myeloma cells showed minimal [3H]thymidine uptake, unlike normal cells.
- Depletion of immune cells did not alter the IFN-induced reduction in myeloma cell numbers.
Conclusions:
- Interferon exhibits a direct cytotoxic effect on human myeloma cells.
- This cytotoxic effect is independent of inhibiting cell proliferation.
- IFN's anti-myeloma activity is not mediated by autologous cytotoxic T-cells, NK-cells, or macrophages.
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