Protoplast-mediated gene transfer into human leukemia (K562) cells

Area of Science:

• Biotechnology
• Molecular Biology
• Hematology

Background:

• Gene transfer into hematopoietic cells is crucial for understanding gene function and developing therapies.
• Existing gene transfer methods face challenges in efficiency and stability.
• Protoplast fusion offers a potential alternative for genetic modification of these cells.

Purpose of the Study:

• To evaluate the efficacy of protoplast fusion for transferring cloned genes into human hematopoietic cells.
• To demonstrate the successful expression and stable integration of transferred genes.
• To establish protoplast fusion as a viable tool for studying gene function in these cells.

Main Methods:

• Preparation of protoplasts containing specific plasmids (pSV2-cat, pSV2-neo-SV-gpt).
• Fusion of these protoplasts with the human leukemic cell line K562 using polyethylene glycol.
• Assessment of gene expression (chloramphenicol acetyltransferase activity) and drug resistance (G418 resistance).
• Analysis of plasmid integration into the host cell's chromosomal DNA.

Main Results:

• Efficient expression of chloramphenicol acetyltransferase (CAT) activity in K562 cells after fusion with pSV2-cat protoplasts.
• Successful transformation of K562 cells to geneticin (G418) resistance using pSV2-neo-SV-gpt protoplasts.
• Demonstration of stable integration of the plasmid genome into the chromosomal DNA of resistant K562 cells.

Conclusions:

• Protoplast fusion is a highly effective method for delivering cloned genes into human hematopoietic cells.
• This technique facilitates the study of specific gene expression and biological activities in these cells.
• Protoplast fusion holds promise for genetic engineering applications in hematology and beyond.