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Analysis of gamma4 germline transcription in human B cells.

Abstract：

BACKGROUND:Allergic reactions occur rarely in patients with chronic helminth infections, although FcepsilonRI-bearing cells are sensitized with anti-parasite IgE and are exposed to antigen. The inhibition of allergic reactivity is due to 'blocking antibodies', predominantly IgG4. IgG4 antibodies represent 50-95% of anti-filarial IgG, and have blocking activity because they compete with cell-bound IgE for allergen binding. Blocking IgG4 antibodies have also been detected in patients treated with immunotherapy. However, the molecular mechanisms of IgG4 regulation have remained unexplored. We address this issue starting with the IL-4-dependent induction of gamma4 germline transcription, an essential step in the commitment to isotype switching. RESULTS:gamma4 germline transcripts were cloned and shown to contain Igamma4 spliced to the 5' portion of Cgamma4 using the splice donor site shared by gamma1 and gamma3 germline transcripts. Sequence analysis located the human Igamma4 exon thick approximate0.6 kb upstream of the Sgamma4 region. Four major transcription start sites located 547-583 bp upstream of the Igamma4 splice donor site were identified by primer extension analysis. A HindIII/NaeI construct (-413/+466) had the highest activity in reporter assays. Transcription was induced 4.6-fold by IL-4, 2.1-fold by CD40 engagement, and 14.5-fold by a combination of the two signals. Thus CD40 crosslinking enhanced IL-4-dependent transcription by 3.1-fold, showing that the two stimuli act synergistically. CONCLUSION:As we understand more about IgG4 regulation, our hope is to apply to allergy the lesson we learnt from helminth infections.

journal_name

Int Arch Allergy Immunol

journal_title

International archives of allergy and immunology

authors

Agresti A,Vercelli D

doi

10.1159/000024099

keywords:

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

279-81

issue

2-4

eissn

1018-2438

issn

1423-0097

pii

24099

journal_volume

118

pub_type

杂志文章

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