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. 1996 Dec;89(4):569–572. doi: 10.1046/j.1365-2567.1996.d01-770.x

The influence of IL-7 V(D)J recombination.

U Döbbeling 1
PMCID: PMC1456594  PMID: 9014823

Abstract

The influence of interleukin-7 (IL-7) on V(D)J recombination was investigated directly in the V(D)J recombination competent pre-B-cell line 38B9. The addition of IL-7 to the medium reduced the V(D)J recombination rate by 52-64%. This reduction was insensitive to the addition of cyclosporin A, indicating that the repression by IL-7 is not mediated by phosphatase 2B. The repression mechanism of IL-7 did not synergize with those of the protein kinase C activator 12-O-Tetradecanoylphorbol-13-acetate (TPA) and the intracellular Ca2+ mobilizer thapsigargin. The actin of IL-7 blocked by the addition of the protein kinase A stimulator caffeine and the synthetic glucocorticoid dexamethasone. IL-7 did not change the m-RNA levels of the V(D)J recombination activating genes RAG-1 and RAG-2, therefore IL-7 must exert its influence on V(D)J recombination either by post-transcriptional regulation of the RAG genes or by the regulation of other genes that are involved in V(D)J recombination. Although IL-7 may be necessary for the induction of and maintenance of V(D)J recombination during some stages of lymphocyte precursor development, it reduces the V(D)J recombination activity in pre-B cells.

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Selected References

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