Transfer factor preparations: some physico-chemical and biological properties

Area of Science:

• Immunology
• Biochemistry
• Biotechnology

Background:

• Transfer factor (TF) is an immune-modulating substance derived from leukocyte extracts.
• Characterizing TF's biological and physico-chemical properties is crucial for understanding its therapeutic potential and ensuring product consistency.

Purpose of the Study:

• To assess the biological and physico-chemical properties of 50 lots of transfer factor (TF).
• To evaluate the impact of production methods (Amicon vs. Sartorius filters) on TF characteristics, including cytotoxicity and pyrogenicity.

Main Methods:

• Physico-chemical analyses included optical density (260/280 nm), peptide content (Lowry method), and ribose content (orcinol method).
• Biological assays involved testing lymphocyte cytotoxicity (chromium release) and pyrogenicity.
• Chromatographic techniques (Sephadex G-10 and G-25) were used to analyze TF composition.

Main Results:

• TF lots exhibited consistent optical densities and defined peptide/ribose content per unit.
• Cytotoxicity was observed in a majority of tested TF lots, particularly those produced using Amicon ultrafiltration.
• Pyrogenicity was more prevalent in TF produced with Amicon filters compared to Sartorius filters.
• Chromatography revealed reproducible peak patterns for TF, indicating consistent molecular profiles.

Conclusions:

• Transfer factor (TF) exhibits reproducible physico-chemical properties but variable biological activities like cytotoxicity and pyrogenicity.
• Production methodology, specifically filtration type, significantly influences TF's pyrogenic potential.
• Further research is warranted to optimize TF production for enhanced safety and efficacy.