| Autor: |
Ishida Y; Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, Rockville, Maryland 20852., Chused TM, Murakami S, Abe R |
| Jazyk: |
angličtina |
| Zdroj: |
Cellular immunology [Cell Immunol] 1994 May; Vol. 155 (2), pp. 414-27. |
| DOI: |
10.1006/cimm.1994.1134 |
| Abstrakt: |
T lymphocyte recognition of cell-associated minor lymphocyte stimulation (Mls) superantigen was studied by simultaneous flow cytometric measurement of T cell free ionized intracellular calcium ([Ca2+]i) with the fluorescent probe indo-1 and T cell binding to antigen-presenting cells stained with a long-chained, membrane-fixed cyanine dye. Cloned T cell-B lymphocyte antigen-presenting cell conjugate formation and increased T cell [Ca2+]i were antigen specific and tightly linked in four Mls-reactive T cell clones. The T cell-antigen-presenting cell conjugates were extremely stable and, like T cell [Ca2+]i elevation, were maintained for more than 2 hr. Three ligand-receptor pairs, (i) T cell receptor/antigen+class II, (ii) CD4/class II, and (iii) LFA-1/ICAM-1, were obligatory participants in T cell recognition of cell-bound superantigen since monoclonal antibodies to any of them blocked formation of cell conjugates. Despite previous reports, Mls recognition occurred by the conventional T cell recognition pathway with easily detected phosphoinositide hydrolysis. B cell activation greatly enhances their recognition by Mls-specific T cells. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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