Immunoglobulin gene expression in transformed lymphoid cells.

Area of Science:

• Molecular Biology
• Immunology
• Cell Biology

Background:

• Gene transfection enables the study of gene function in various cell types.
• Plasmid vectors like pSV2-gpt are crucial tools for introducing foreign genes into host cells.
• Understanding immunoglobulin synthesis is vital in immunology and cancer research.

Purpose of the Study:

• To establish a method for transfecting myeloma, hybridoma, and thymoma cell lines.
• To demonstrate the expression of the Escherichia coli xanthine-guanine phosphoribosyltransferase gene (gpt) in transfected lymphoid cells.
• To investigate the synthesis and secretion of immunoglobulin K light chains in transformed cell lines.

Main Methods:

• Transfection of cell lines (myeloma, hybridoma, thymoma) using the plasmid vector pSV2-gpt.
• Selection of transformed cells using a selective medium.
• Analysis of enzyme synthesis (gpt) and immunoglobulin light chain expression via immunoprecipitation and two-dimensional gel electrophoresis.

Main Results:

• Successful transfection and stable expression of the gpt gene in multiple lymphoid cell lines.
• Demonstrated synthesis of the bacterial enzyme 5-phospho-alpha-D-ribose-1-diphosphate:xanthine phosphoribosyltransferase (XGPRT) in transformed cells.
• Expression and secretion of S107 myeloma K light chain in transformed J558L myeloma and hybridoma cells, forming functional antibody molecules.

Conclusions:

• The pSV2-gpt vector is effective for gene transfer and expression in diverse lymphoid cell types.
• Transfected hybridoma cells can produce and secrete immunoglobulin molecules containing the introduced light chain.
• This system provides a valuable model for studying immunoglobulin gene expression and antibody production.