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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ramarli, D. Milanese, C. Reinherz, E. L. Fox, D. A. |
| Abstract | Considerable evidence now exists to support the notion that the 50-kDa sheep erythrocyte-binding protein, T11, represents an essential cell surface component of a human T-cell lineage activation pathway. Furthermore, it is known that the human T3-Ti T-cell antigen/major histocompatibility complex receptor complex is capable of regulating cell growth mediated by the T11 structure. Here we show that, within the T3+ thymocyte compartment, T3-Ti crosslinking rapidly inhibits T11-initiated interleukin 2 (IL-2) gene transcription and translation. This inhibition is restricted to the IL-2 gene (IL2) as transcription of both the IL-2-receptor gene (IL2R) and the Ti beta-chain gene (TCRB) are not affected (human gene designations are in parentheses). Perhaps more importantly, T3-Ti-mediated IL-2 inhibition of this type is not operational in peripheral T lymphocytes. The results imply that the majority of T3+ thymocytes are functionally distinct from peripheral T lymphocytes despite their T3+ phenotype and must possess a unique endogenous regulatory component for suppressing IL-2 gene activity. Moreover, since IL-2 is likely rate-limiting for growth within the thymus, the findings provide one plausible mechanism for thymic selection--namely, T3-Ti crosslinking of thymocytes upon interaction with self-major histocompatibility complex inhibits clonal expansion of high-affinity autoreactive cells. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 18 |
| Volume Number | 83 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1986-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antigens, Surface Physiology Interleukin-2 Genetics Major Histocompatibility Complex Receptors, Antigen, T-Cell T-Lymphocytes Immunology Antigens, Differentiation, T-Lymphocyte Biosynthesis Lymphocyte Activation Tetradecanoylphorbol Acetate Pharmacology Transcription, Genetic Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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