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Microinjection of macromolecules into leukemic cells by cell fusion technique: search for intracellular
Abstract:
To investigate the intracellular molecular events during leukemic cell proliferation, we have examined the method of ghost-mediated microinjection of macromolecules into leukemic cell line cells (HL-60). Samples were packed into red cell ghosts. Microinjection was performed by the fusion of ghosts and HL-60 cells using the hemagglutinating virus of Japan (HVJ). Fusion rate was about 80-90%, when determined by the injection of FITC-labeled globulins (IgG) or diphtheria toxin fragment A into HL-60 cells. When the nuclear protein extract from normal granulocytes was injected into HL-60 cells, their growth was significantly suppressed. The injection of the nuclear protein extract from HL-60 itself into HL-60 cells did not inhibit their growth. This finding suggests that leukemic cells may be deficient in intracellular regulatory factors which have suppressive activity on cell growth.
Insights
Leukemic cell proliferation may stem from a deficiency in growth-suppressing intracellular factors. Injecting normal granulocyte nuclear proteins into leukemia cells (HL-60) inhibited their growth, unlike extracts from leukemia cells themselves.
Area of Science:
- Cell Biology
- Molecular Biology
- Hematology
Background:
- Leukemic cell proliferation involves complex intracellular molecular events.
- Understanding these events is crucial for developing targeted therapies.
- The HL-60 cell line is a widely used model for studying human myeloid leukemia.
Purpose of the Study:
- To investigate intracellular molecular mechanisms regulating leukemic cell proliferation.
- To evaluate the efficacy of ghost-mediated microinjection for delivering macromolecules into HL-60 cells.
- To identify potential regulatory factors involved in suppressing leukemic cell growth.
Main Methods:
- Ghost-mediated microinjection of macromolecules into HL-60 cells.
- Utilized hemagglutinating virus of Japan (HVJ) for efficient cell fusion (80-90% fusion rate).
- Injected nuclear protein extracts from normal granulocytes and HL-60 cells into HL-60 targets.
Main Results:
- Microinjection of normal granulocyte nuclear extracts significantly suppressed HL-60 cell growth.
- Microinjection of HL-60 nuclear extracts did not inhibit HL-60 cell growth.
- Demonstrated the feasibility of ghost-mediated microinjection for delivering functional proteins into leukemic cells.
Conclusions:
- Leukemic cells (HL-60) may lack essential intracellular regulatory factors that normally suppress cell growth.
- This deficiency in growth-suppressive factors could contribute to uncontrolled leukemic cell proliferation.
- Ghost-mediated microinjection is a viable technique for delivering regulatory molecules into leukemic cells for therapeutic research.