Lymphocyte multiplication in vitro induced by mitogens and antigens

Area of Science:

• Immunology
• Cell Biology
• Biotechnology

Background:

• Assessing lymphocyte proliferation is crucial for understanding immune function.
• Existing methods can be complex or require larger sample volumes.
• A simple, sensitive assay is needed for routine immune response evaluation.

Purpose of the Study:

• To develop and validate a simple whole blood assay for measuring lymphocyte proliferation.
• To quantify immune responses using a cell multiplication index.
• To assess the utility of this method in various immune states.

Main Methods:

• A novel technique using 0.2 ml whole blood to culture lymphocytes with mitogens and antigens.
• Quantification of lymphocyte response by comparing cell numbers with and without stimulation.
• Calculation of a cell multiplication index to represent the increment in cell numbers.

Main Results:

• Healthy subjects showed significant lymphocyte proliferation to phytohemagglutinin (PHA), pokeweed mitogen (PWM), and concanavalin A (Con A).
• Positive responses to purified protein derivative (PPD) and Candida extract were observed in skin-test positive individuals.
• Patients with immune deficiencies and skin-test negative individuals exhibited reduced or absent in vitro responses.

Conclusions:

• The developed cell multiplication index assay is a precise and sensitive method for measuring lymphocyte responses.
• The assay requires only a small blood volume (0.2 ml) and is suitable for routine use.
• This technique effectively differentiates immune responses in healthy individuals, those with immune deficiencies, and in response to specific antigens.