| Autor: |
Simpson E; Clinical Research Centre, Harrow, Middlesex, U.K., Robinson PJ, Chandler P, Millrain MM, Pircher HP, Brändle D, Tomlinson P, Antoniou J, Mellor A |
| Jazyk: |
angličtina |
| Zdroj: |
Immunology [Immunology] 1994 Jan; Vol. 81 (1), pp. 132-6. |
| Abstrakt: |
Participation of transmembrane (TM) and glycosyl-phosphatidylinositol (GPI) anchored H-2Db molecules in antigen presentation and thymic selection events was investigated using transgenic mice. Both GPI-Db and TM-Db can efficiently present H-Y antigen, influenza and lymphocytic choriomeningitis virus (LCMV) peptides to primed cytotoxic, H-2Db-restricted T cells. Transgenic mice expressing GPI-Db, although unable to reject TM-Db skin grafts, nevertheless generate secondary CTL responses which can lyse TM-Db-bearing targets, indicating that GPI-Db mice fail to delete all TM-Db-reactive T cells. Furthermore, double-transgenic mice bearing GPI-Db and a T-cell receptor (TcR) for H-2Db+LCMV do not positively select receptor positive, CD8+CD4- T cells. This paradoxical behaviour of GPI-Db molecules suggests that the structural requirements for antigen presentation and thymic selection by class I molecules are different and may explain why GPI-linked class I molecules, such as Qa-2, do not appear to function as restriction elements in vivo. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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