Dialyzable transfer factor in experimental Chagas' disease: in vitro studies

Area of Science:

• Immunology
• Molecular Biology
• Parasitology

Background:

• Trypanosoma cruzi infection elicits immune responses crucial for host defense.
• Cellular immunity plays a key role in controlling parasitic infections.
• The nature of molecules mediating cellular immune transfer remains an area of investigation.

Purpose of the Study:

• To investigate the ability of dialyzable transfer factor (TF) from normal (TFn) and Trypanosoma cruzi-infected (TFi) mice to transfer cellular immunity.
• To determine the antigen specificity of this immune transfer.
• To explore the potential composition of the active component in TFi.

Main Methods:

• Preparation of dialyzable transfer factor (TF) from spleen and lymph node cells of normal and T. cruzi-infected mice.
• Assessment of cellular immunity transfer using macrophage migration inhibition assay.
• Evaluation of lymphocyte transformation test to assess immune response.
• Analysis of free amino acid content in TFn and TFi preparations.

Main Results:

• Only TFi demonstrated the ability to transfer cellular immune responses to T. cruzi antigens.
• The immune transfer was found to be antigen-specific.
• TFi exhibited a higher content of free amino acids compared to TFn.
• Stimulation of lymphocyte transformation by TFi required the presence of T. cruzi antigens.
• The observed lymphocyte stimulation was not attributed to increased glycine or serine levels.

Conclusions:

• Dialyzable transfer factor (TFi) from T. cruzi-infected mice effectively transfers antigen-specific cellular immunity.
• The findings support the hypothesis that TFi is derived from immune RNA.
• This suggests a potential mechanism for non-genetic transfer of immunological memory.