Abstract
Interleukin-2 (IL-2)-induced transcription of the J chain gene was used as a model for analyzing cytokine regulation during B cell development. To determine whether IL-2 signals are targeted to a J chain gene enhancer as well as to its promoter, the sequences flanking the J chain gene were first examined for DNase I hypersensitivity. Of six sites identified, two strong ones, 7.5 kb upstream of the J chain gene, were found to be associated with an enhancer that is active only during the antigen-driven stages of B cell development. Further analyses of the enhancer in the IL-2-responsive presecretor BCL1 cells showed that the enhancer is activated at this stage by an IL-2 signal that functions by opening the enhancer chromatin and stimulating STAT5 to bind to a STAT5 element critical for the enhancer induction. Moreover, after this early induction stage, the enhancer was shown to be constitutively open and active in terminally differentiated plasma cells.
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