Specificity and structural analysis of a guinea pig transfer factor-like activity.

Area of Science:

• Immunology
• Molecular Biology

Background:

• Immune responses can be transferred between individuals using cell-free extracts.
• Transfer factors are hypothesized to carry antigen-specific information.

Purpose of the Study:

• To characterize the biochemical nature of a transfer factor-like activity from guinea pigs.
• To determine the components responsible for antigen-specific immune modulation.

Main Methods:

• Preparation of transfer factor-like activity from immune guinea pig leukocyte lysates using Sephadex G-25 chromatography.
• Assessing activity via antigen-dependent migration inhibition and thymidine uptake in nonimmune lymphoid cells.
• Biochemical characterization including heat, alkali, pronase, and phosphodiesterase treatments, followed by further purification (DEAE-cellulose chromatography).

Main Results:

• The transfer factor-like activity demonstrated antigen-dependent, donor-specific immune modulation in vitro.
• The activity was sensitive to heat, alkali, pronase, and phosphodiesterase, with differential inhibition by traysylol.
• Purified material contained polymerized amines and phosphate, suggesting a complex molecular structure.

Conclusions:

• The guinea pig transfer factor-like activity exhibits characteristics consistent with a molecule containing both peptide and phosphate moieties.
• These findings support the hypothesis that transfer factors are complex molecules capable of transferring antigen-specific immune information.