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Clonal populations of T cells in normal elderly humans: the T cell equivalent to "benign monoclonal gammapathy".
Open accessAbstract
To determine whether T cells, like B cells, can become clonally expanded in normal individuals as a function of age, we compared the T cell V beta repertoire of cord blood to that of peripheral blood from normal donors over 65 yr of age. T cells from elderly subjects contained expanded subsets (greater than the mean+three standard deviations) of T cell receptor (TCR) V beta populations. These expanded subsets were observed primarily among CD8, but not CD4 cells, represented up to 37.5% of all CD8 cells, and were present in most elderly subjects. An expanded V beta 5.2/3 CD8 subset and a V beta 6.7a CD8 subset from separate donors were analyzed by reverse transcriptase-polymerase chain reaction, cloning and sequencing of the TCR beta chain VDJ junction. In both cases the expanded subsets were mono- or oligoclonal while control CD4 populations were polyclonal. Using two-color flow cytometry it was possible to identify the expanded V beta 6.7a subset as CD8+ CD28-CD11b+ cells. In three of five random old subjects similar expansions of V beta subsets were found specifically in the CD8+ CD28- subpopulation, an interesting subset of cytotoxic T lymphocytes, known to lack proliferative responses to TCR stimuli. It is common practice to use the demonstration of clonality as a diagnostic indicator for T cell lymphoma/leukemia. In view of the high frequency of expanded T clones of T cells in normal elderly subjects the diagnostic usefulness of this test should be reexamined.
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Metadata
- Authors
- Posnett, D. N., Sinha, R., Kabak, S., & Russo, C.
- Venue
- The Journal of experimental medicine
- Publisher
- Rockefeller University Press
- Published
- 1994-02-01
- Volume
- 179
- Issue
- 2
- Pages
- 609-618
- ISSN
- 0022-1007 (ISSN-L)
- 1540-9538
- OpenAlex
- W2133908456
- Cited by
- 760
- References
- 0
- FWCI
- 15.92
- Type
- journal article
- Language
- en
- Open access
- green
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