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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ben-yehuda, A. Dyall, R. Szabo, P. Weksler, M. E. |
| Description | Author Affiliation: Ben-Yehuda A ( Division of Geriatrics and Gerontology, Cornell University Medical College, New York, NY 10021.); |
| Abstract | The rearrangement of immunoglobulin genes in B-lymphocyte precursors requires the expression of the recombination activating genes (Rag), which leads to the generation of a highly diverse B-cell repertoire. We can use the level of Rag-1 mRNA in the bone marrow as an index of its capacity to support the maturation of B lymphocytes as all detectable bone marrow Rag-1 mRNA is expressed by B-cell precursors. In mouse bone marrow, Rag-1 mRNA increases during the first 2 months of life to reach its maximal level at 2 months of age. This level is maintained until 5 months of age and thereafter declines to a minimum level by 10 months of age. Thus, bone marrow Rag-1 mRNA is highest at the time when thymic function is maximal in euthymic mice. An association between thymic activity and bone marrow Rag-1 gene expression was supported by showing a low level of bone marrow Rag-1 mRNA in athymic nude mice at an age when this gene is maximally expressed in euthymic mice. Another characteristic of B cells in nude mice is their preferential rearrangement of diversity region (D)-proximal heavy-chain variable region (VH) genes. We demonstrated that injection of syngeneic splenic T cells into nude mice not only stimulates an increase in Rag-1 mRNA in their bone marrow B-cell precursors but also restores their random use of VH genes. Most interestingly, injection of supernatant medium from phytohemagglutinin-activated splenic T-cell cultures from young euthymic mice also induces both Rag-1 mRNA in bone marrow B-cell precursors and random use of VH genes. These findings suggest that thymic function can regulate both Rag-1 gene expression and VH gene use by bone marrow B-cell precursors. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 25 |
| Volume Number | 91 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1994-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Aging Immunology B-Lymphocytes Bone Marrow Physiology Hematopoietic Stem Cells Homeodomain Proteins Protein Biosynthesis Thymus Gland Growth & Development Animals Cytology DNA Primers Gene Expression Gene Rearrangement Lymphocyte Transfusion Mice Mice, Inbred BALB C Mice, Inbred C57BL Mice, Nude Molecular Sequence Data Polymerase Chain Reaction Proteins Genetics RNA, Messenger Biosynthesis Transplantation, Isogeneic Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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