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TRANSCRIPTIONAL REGULATION OF THE GERMLINE IMMUNOGLOBULIN C-ALPHA AND C-EPSILON GENES - IMPLICATIONS FOR COMMITMENT TO AN ISOTYPE SWITCH


GAFF, C; Grumont, RJ; Gerondakis, S
1992-10
INTERNATIONAL IMMUNOLOGY
Journal Article
4
10
1145-1151
Lymphokine directed isotype switching is preceded by the induced expression of the corresponding germline Ig heavy chain constant region (C(H)) gene. This association favors a model in which lymphokine induced germline C(H) gene expression promotes switch recombination by increasing the accessibility of the switch region to a recombinase(s). An important prediction of this model is that the induction of germline C(H) RNAs represents increased specific de novo transcription. To test if this prediction is fulfilled by the switch commitment factors, IL-4 and transforming growth factor-beta (TGF-beta), we have utilized a B cell line, 1.29, that switches from IgM to IgE and IgA in vitro. In this cell line, IL-4 and TGF-beta increase germline C(epsilon) and C(alpha) RNA levels respectively, predominantly by elevating transcription of these genes. Transcription of germline C(epsilon) and C(alpha) genes appears to be independently regulated and is not affected by lipopolysaccharide or IL-5. These results are discussed in the context of the molecular events necessary to commit a B cell to an isotype switch.
OXFORD UNIV PRESS UNITED KINGDOM
HEAVY-CHAIN TRANSCRIPTS; GROWTH FACTOR-BETA; B-CELLS; IGA PRODUCTION; LYMPHOCYTES-B; EXPRESSION; INTERLEUKIN-4; LIPOPOLYSACCHARIDE; RECOMBINATION; INDUCTION
10.1093/intimm/4.10.1145
Refer to copyright notice on published article.

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Creation Date 1992-10-01 12:00:00