Enucleation of normal and transformed cells

Area of Science:

• Cell Biology
• Biophysics

Background:

• Cytochalasin-mediated enucleation is a technique used to study cellular responses.
• Understanding enucleation requirements in different cell types is crucial for cell biology research.

Purpose of the Study:

• To quantitatively analyze centrifugal force requirements for enucleation in untransformed and transformed cell lines.
• To investigate the impact of cytochalasins, cellular ATP levels, and cytoskeletal organization on enucleation efficiency.

Main Methods:

• Quantitative analysis of cell enucleation using varying centrifugal forces.
• Comparison of enucleation responses between Balb/c 3T3, Swiss 3T3, and Kirsten sarcoma virus-transformed Balb/c 3T3 (3T3-K) cell lines.
• Assessment of cytochalasin B and D efficacy, and the effects of 2-deoxyglucose and monensin on enucleation.

Main Results:

• Enucleation g-force requirements differed significantly between cell lines, with transformed 3T3-K cells needing four times more force than Swiss 3T3 cells for 50% enucleation.
• A correlation was observed between easier enucleation and a well-formed stress fiber network.
• Cytochalasin D was more effective than cytochalasin B for enucleating transformed cells.
• Decreased cellular ATP levels, induced by 2-deoxyglucose or monensin, reduced enucleation efficiency.

Conclusions:

• Cellular ATP levels and cytoskeletal organization influence the centrifugal force required for cytochalasin-mediated enucleation.
• Transformed cells exhibit distinct enucleation characteristics compared to untransformed cells, potentially due to altered cytoskeletal dynamics.