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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Brot, N. Elkon, K. B. Drappa, J. |
| Description | Author Affiliation: Drappa J ( Hospital for Special Surgery, Cornell University Medical College, New York, NY 10021.); |
| Abstract | The lymphoproliferation (lpr) mutation in the MRL strain of mice is caused by the insertion of the early transposable element ETn in the Fas gene. The insertion causes a striking decrease in Fas mRNA expression and is associated clinically with marked acceleration of the lupus-like disease. To further explore the role of the Fas protein in T-cell selection in the thymus and tolerance in the peripheral immune system, we produced a monospecific polyclonal anti-murine Fas antibody that binds to a polymorphic region of the protein. Fas protein expression was detected on approximately 90% of BALB/c and MRL +/+ thymocytes, and the expression was highest on CD4+CD8+ thymocytes, the stage at which most thymocytes die by apoptosis. In contrast to the high level of expression of Fas on thymocytes, Fas was detected on < 10% of normal splenic T cells. After activation of splenic T cells with Con A or anti-CD3 and interleukin 2, Fas expression increased approximately 10-fold. Fas expression on splenic B cells was also markedly up-regulated after activation with lipopolysaccharide or anti-mu antibodies. The Fas protein was not detected on resting or activated lymphocytes obtained from MRL lpr/lpr mice. Together, these findings suggest that Fas plays a role in both thymic selection and T-cell survival in the periphery and that the accelerated autoimmunity in MRL lpr/lpr mice results from a defect in both of these pathways. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 21 |
| Volume Number | 90 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1993-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antigens, CD4 Immunology Antigens, CD8 Antigens, Surface Biosynthesis Lupus Erythematosus, Systemic Lymphocyte Activation T-Lymphocyte Subsets Metabolism Amino Acid Sequence Animals Antigens, CD95 Cells, Cultured Flow Cytometry Genetics Mice Mice, Inbred BALB C Mice, Inbred CBA Mice, Mutant Strains Mice, SCID Molecular Sequence Data Polymerase Chain Reaction Protein Biosynthesis RNA, Messenger Spleen Transcription, Genetic Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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