Summary
As an approach to the elucidation of the essential steps in the immune pathway, the uptake and retention of immunogenic and non-immunogenic analogs of a monofunctional antigen by guinea pig macrophages and the efficiency of macrophages pulsed with the compounds to present antigen to sensitized T lymphocytes were compared. L-Tyrosine-azobenzene-p-arsonate (RAT) and its non-immunogenic analog, 4-hydroxyphenyl-n-propane-3-azobenzene-p-arsonate (RAN), react similarly with antiarsonate antibody, but RAN, unlike RAT, is unable to induce cellular immunity in guinea pigs. The uptake and retention patterns of the two compounds by macrophages differed in that, at a given time, more RAN than RAT was retained and detectable on cell surfaces by anti-arsonate antibody. Equivalent numbers of T lymphocytes from guinea pigs sensitized to RAT formed antigen-dependent clusters with macrophages pulsed with either RAT or RAN after 24 hr in culture, but not with macrophages pulsed with an azobenzenoid compound of unrelated specificity. On the other hand, T lymphocytes from guinea pigs immunized with RAN showed no significant capacity to bind to macrophages which had been pulsed with any of the compounds. The number of lymphocytes from RAT-sensitized animals which bound to RAT-pulsed macrophages remained relatively stable over a 48 hr period, whereas clusters of the same lymphocytes with RAN-pulsed macrophages dissocitated to background levels within that time. Early cluster formation mediated by RAN, as well as its ability to induce transient specific T cell unresponsiveness to RAT in vivo, indicate that T cells are capable of recognizing (binding) the non-immunogen. However, such early, and perhaps weak, interaction with RAN-pulsed macrophages did not induce DNA synthesis by T cells. Anti-Ia serum completely blocked cluster formation mediated by either RAT or RAN. Thus, the only significant distinction disclosed by these studies between the immunogenic and non-immunogenic compounds was the stability of macrophage-T cell interaction as determined by the persistence of antigen mediated cell clusters in culture, suggesting that this may be a factor in immunogenic discrimination.
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Abbreviations
- ABA:
-
azobenzenearsonate
- BSA:
-
bovine serum albumin
- CFA:
-
complete Freund's adjuvant
- IFA:
-
incomplete Freund's adjuvant
- KLH:
-
keyhole limpet hemocyanin
- LNC:
-
Lymph node cells
- MHC:
-
major histocompatibility complex
- PEC:
-
peritoneal exudate cells
- PEL:
-
peritoneal exudate lymphocytes
- RAN:
-
4-hydroxyphenyl-n-propane-3-azobenzene-p-arsonate
- RAT:
-
L-tyrosine-azobenzene-p-arsonate
- TAT:
-
L-tyrosine-azobenzene-p-trimethylammonium chloride
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Aided by USPHS Grant AI 05664.
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Fong, S., Chen, P., Nitecki, D.E. et al. Macrophage-T cell interaction mediated by immunogenic and non-immunogenic forms of a monofunctional antigen. Mol Cell Biochem 25, 131–142 (1979). https://doi.org/10.1007/BF00235363
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DOI: https://doi.org/10.1007/BF00235363