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Effects of human transfer factor on the migration of guinea-pig macrophages: is there an antigen-specific activity?
Abstract:
Dialysable transfer factor (TF) prepared from the buffy-coat cells of tuberculin-positive human donors exerted antigen (PPD)-dependent inhibition of migration of guinea-pig peritoneal exudate cells (PEC) provided that migration of the cells was not strongly affected by PPD alone. TF from tuberculin-negative donors did not do this. The effect could be better demonstrated with tuberculin-sensitive than with normal PEC. Differences in the actions of 'tuberculin-positive' and 'negative' TF may also be seen in the absence of antigen. In a similar but more restricted series of experiments with diphtheria toxoid (DT) as antigen, DT-dependent inhibition was observed only with 'DT-positive' TF. The findings concerning antigen-dependent inhibition in both the tuberculin and toxoid systems are compatible with the concept of an antigen-specific TF, but it is argued that they should not be taken as strong evidence of such specificity. In the tuberculin system the results suggest an alternative explanation, namely that 'tuberculin-positive' TF contains a higher level of a non-specific activity. Whether specific or not, the antigen-dependent activity probably involves a stimulatory action on antigen-induced lymphocyte activation leading to enhanced production of macrophages migration inhibition factor, and it could be related to the 'transfer' phenomenon in vivo.
Insights
Dialysable transfer factor (TF) from tuberculin-positive donors inhibited guinea-pig cell migration in response to antigen. This antigen-dependent activity, observed in both tuberculin and toxoid systems, may involve non-specific factors.
Area of Science:
- Immunology
- Cell Biology
Background:
- Dialysable transfer factor (TF) is derived from buffy-coat cells and plays a role in immune responses.
- Antigen-specific immune modulation is a key area of immunological research.
Purpose of the Study:
- To investigate the antigen-dependent and independent effects of dialysable transfer factor (TF) on cell migration.
- To explore the specificity of TF activity in immune responses.
Main Methods:
- Preparation of TF from human donors with known tuberculin or diphtheria toxoid (DT) sensitivity.
- Assay of TF's effect on guinea-pig peritoneal exudate cells (PEC) migration in the presence and absence of specific antigens (PPD and DT).
Main Results:
- TF from tuberculin-positive donors demonstrated PPD-dependent inhibition of PEC migration, particularly in tuberculin-sensitive cells.
- Similar antigen-dependent inhibition was observed with DT-positive TF and DT.
- Differences in TF activity were noted between positive and negative donors, even without antigen.
Conclusions:
- Findings suggest antigen-dependent inhibition by TF, but strong evidence for antigen specificity is lacking.
- An alternative explanation involves higher non-specific activity in TF from positive donors.
- The antigen-dependent activity likely enhances lymphocyte activation and macrophage migration inhibition factor production, potentially linking to in vivo transfer phenomena.