Abstract:
:The humoral response against the bacterial polysaccharide antigen alpha(1-->3) dextran (Dex) is controlled by J558 idiotype-(Id) specific T cells. These T cells of which the cell clone 178-4 Ts is a representative by all relevant criteria, recognize J558 Id-bearing B cells in an I-Ed-restricted manner. Costimulation via CD28/B7-1 but not via CD40/CD40L leads to T-cell activation. These T cells do not only suppress B cells producing the immunoglobulin (Ig)G3 isotype but also support the survival and clonal expansion of J558 Id positive B cells both in vivo and in vitro. This T-cell mediated dominance of the J558 idiotype limits the appearance of antibodies carrying other more diverse idiotypes which appear in immunized BALB/c nu/nu mice where no regulatory T cells occur. This T-cell mediated antibody invariance could be a strategy of the immune system responding to highly conserved antigens like polysaccharides, different from those against protein antigens, where diversity is assumed to be the basis for a successful response.
journal_name
Scand J Immunoljournal_title
Scandinavian journal of immunologyauthors
Rademaekers A,Specht C,Kölsch Edoi
10.1046/j.1365-3083.2001.00864.xkeywords:
subject
Has Abstractpub_date
2001-03-01 00:00:00pages
240-4issue
3eissn
0300-9475issn
1365-3083pii
sji864journal_volume
53pub_type
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