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A PMN-derived factor that enhances DNA-synthesis in PHA or antigen-stimulated lymphocytes
Abstract:
The DNA synthesis potentiation of a mouse polymorphonuclear leukocyte (PMN) factor was studied by using phytohemagglutinin (PHA)-stimulated syngeneic thymocytes. The partially purified PMN factor was nonmitogenic and exhibited maximum potentiation of thymocytes when added within 3 hr of PHA stimulation. PHA-stimulated, but not nonstimulated thymocytes absorbed PMN potentiation factor. 125I-labeled factor binding to stimulated thymocytes was observed. Our results suggest that an acceptor site for PMN factor may be generated on the thymocyte surface only after PHA stimulation.
Insights
A mouse polymorphonuclear leukocyte (PMN) factor enhances DNA synthesis in phytohemagglutinin (PHA)-stimulated thymocytes. This PMN factor binds to stimulated thymocytes, suggesting a specific interaction is required for its effect.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Polymorphonuclear leukocytes (PMNs) play a role in immune responses.
- Thymocytes are precursor T cells crucial for adaptive immunity.
- Phytohemagglutinin (PHA) is a lectin used to stimulate lymphocytes.
Purpose of the Study:
- To investigate the effect of a PMN-derived factor on thymocyte DNA synthesis.
- To characterize the interaction between the PMN factor and thymocytes.
Main Methods:
- Partially purified PMN factor was prepared.
- The factor's effect on PHA-stimulated thymocyte DNA synthesis was assessed.
- Absorption and radioligand binding assays were used to study factor-thymocyte interaction.
Main Results:
- The PMN factor potentiated DNA synthesis in PHA-stimulated thymocytes.
- The factor was most effective when added within 3 hours of PHA stimulation.
- PHA-stimulated thymocytes, but not unstimulated ones, absorbed the PMN factor.
- Binding of 125I-labeled PMN factor to stimulated thymocytes was detected.
Conclusions:
- A PMN-derived factor can enhance thymocyte DNA synthesis.
- The interaction requires PHA stimulation, suggesting an inducible acceptor site on thymocytes.
- This finding sheds light on PMN-thymocyte communication in immune regulation.