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Influence of PMA on T-lymphocyte responses to mitogenic lymphokines
Abstract:
Phorbol myristate acetate (PMA), a reagent frequently used in vitro to bypass macrophage function and to elicit cytokines, has a variety of effects on the behavior of T lymphocytes in tissue culture. For example, PMA in concentrations greater than 10(-10)M is highly comitogenic with phytohemagglutinin (PHA) for C3H/HeJ thymocytes, and significantly potentiates lymphokine-induced proliferative responses of long-term MLC cells, cloned cytolytic T cells, and interleukin-2 (IL-2)-dependent T-cell lines. Since these activated T-lymphocyte populations are used to detect IL-2, PMA can interfere with accurate assessment of IL-2 concentration by quantitative bioassay. Further, if greater than 10(-10) M PMA remains as a contaminant in PMA-induced lymphokine preparations, it can mediate lymphokine-like biologic activity, and, therefore, obscure interpretation of experiments involving lymphocyte-lymphokine interactions.
Insights
Phorbol myristate acetate (PMA) can interfere with T-lymphocyte research by affecting cytokine production and proliferation. Researchers must be aware of PMA contamination in lymphokine preparations to avoid misinterpreting experimental results.
Area of Science:
- Immunology
- Cell Biology
Background:
- Phorbol myristate acetate (PMA) is a common reagent used to stimulate macrophage function and cytokine production in vitro.
- T lymphocytes play a crucial role in immune responses, and their behavior is often studied in tissue culture.
Purpose of the Study:
- To investigate the effects of PMA on T lymphocyte behavior in tissue culture.
- To highlight potential interferences of PMA in T-lymphocyte research, particularly in interleukin-2 (IL-2) bioassays and lymphokine studies.
Main Methods:
- Experiments involved using C3H/HeJ thymocytes, long-term MLC cells, cloned cytolytic T cells, and IL-2-dependent T-cell lines.
- PMA was used at concentrations greater than 10(-10)M to assess its effects on T-cell proliferation and responses.
Main Results:
- PMA at concentrations >10(-10)M acts as a comitogen with phytohemagglutinin (PHA) for thymocytes.
- PMA significantly potentiates lymphokine-induced proliferative responses in various T-cell populations.
- Contaminated PMA in lymphokine preparations can exhibit lymphokine-like activity.
Conclusions:
- PMA can interfere with the accurate quantitative bioassay of IL-2 by affecting T-lymphocyte populations used for detection.
- Unreacted PMA in lymphokine preparations can lead to misinterpretation of experimental outcomes regarding lymphocyte-lymphokine interactions.