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The role of I-J in the suppressor T-cell circuit which influences the effector stage of contact sensitivity: antigen together with syngeneic I-J region determinants induces and activates T suppressor cells.
- Source :
- Immunology; May83, Vol. 49 Issue 1, p191-199, 9p
- Publication Year :
- 1983
-
Abstract
- One of the T suppressor circuits induced by picrylsulphonic acid includes the T suppressor cell (Ts-eff) which acts at the efferent stage of the contact sensitivity reaction and produces antigen-specific T suppressor factor (TsF). This factor does not act directly but arms a T acceptor cell (Tacc). This Tacc liberates a non-specific inhibitor when it is armed with TsF and then exposed to picrylated cells sharing the I-J genotype of the source of the TsF. This paper investigates the role of I-J region gene products in this T suppressor circuit. Two approaches were used. Syngeneic CBA (H-2<superscript>k</superscript>) lymphocytes were separated into I-J<superscript>+</superscript> and I-J<superscript>-</superscript> cells by treatment with anti-I-J<superscript>k</superscript> serum followed by panning on anti-immunoglobulin plates. The cells were then picrylated and used as a source of antigen. Alternatively, B10.A congeneic mice syngeneic (SR) or allogeneic (3R) with CBA at the I-J locus were picrylated and used similarly. The main findings were as follows. (i) The intravenous injection of picrylated I-J<superscript>+</superscript> spleen cells but not a similar number of I-J<superscript>-</superscript> cells induced Ts-eff which blocked the transfer of contact sensitivity. Picrylated unseparated cells syngeneic, but not allogeneic, at the I-J locus were also effective. (ii) It is known that the lymphocytes of mice injected with picrylsulphonic acid and then re-exposed to antigen by painting with picryl chloride liberate TsF in vitro. The re-exposure to antigen can be replaced by the intravenous injection of picrylated I-J<superscript>+</superscript> cells or by cells syngeneic at the I-J locus the day before harvesting the spleen cells. (iii) The release of non-specific inhibitor by Tacc armed with TsF requires exposure to picrylated I-J<superscript>+</superscript> cells or cells syngeneic at the I-J locus. The requirement for antigen on a cell bearing syngeneic I-J suggests that antigen together with I-J is an activation signal in this T-cell circuit. The simplest explanation is that the receptor of the pristine Ts and of the mature Ts-eff is similar to T suppressor factor. [ABSTRACT FROM AUTHOR]
- Subjects :
- T cells
SUPPRESSOR cells
VASCULAR endothelium
CELLS
BLOOD vessels
ANTIGENS
Subjects
Details
- Language :
- English
- ISSN :
- 00192805
- Volume :
- 49
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Immunology
- Publication Type :
- Academic Journal
- Accession number :
- 13954538