Purification and quantification of T and B lymphocytes by an affinity method

Area of Science:

• Immunology
• Cell Biology
• Biotechnology

Background:

• Isolating specific lymphocyte populations is crucial for immunological research.
• Surface immunoglobulin (SIg) is a key marker for B lymphocytes.
• Existing methods for lymphocyte separation can be labor-intensive and may result in cell contamination.

Purpose of the Study:

• To develop an efficient method for isolating human B lymphocytes using affinity surfaces.
• To characterize the binding mechanisms of lymphocytes to these surfaces.
• To optimize the technique for producing highly purified T lymphocyte populations.

Main Methods:

• Coupling human immunoglobulin (HGG) to tissue culture plastic using carbodiimide.
• Treating surfaces with anti-HGG antisera to create affinity surfaces.
• Centrifuging lymphocytes onto affinity surfaces and recovering unattached cells.
• Utilizing F(ab')2 fragments to confirm specific binding interactions.
• Quantifying SIg-bearing cells and assessing purity of isolated lymphocyte populations.

Main Results:

• Developed functional affinity surfaces that bind SIg-bearing B lymphocytes.
• Demonstrated that cell attachment occurs via Fc receptors and SIg, which can be blocked by F(ab')2 fragments.
• Achieved specific attachment through kappa and lambda light chains.
• Successfully produced T lymphocytes with less than 1% contaminating SIg-positive cells.

Conclusions:

• Affinity surfaces provide an effective and rapid method for isolating SIg-positive B lymphocytes.
• The technique allows for specific cell separation based on immunoglobulin light chains.
• This method is valuable for processing large numbers of lymphocytes to obtain highly purified cell populations for research.