Format:
Online-Ressource
ISSN:
1521-4141
Content:
Abstract: Major histocompatibility complex (MHC) class II deficiency (bare lymphocyte syndrome, BLS) is a rare primary immunodeficiency classified as a subgroup of severe combined immunodeficiency. We studied T and B lymphocyte function by examining the CD40 ligand/CD40 system in three BLS patients from two unrelated families. CD40 ligand expression by maximally activated BLS T cells was diminished. This abnormality may represent immunological naïveté rather than a general T cell defect, since expression of activation marker CD69 and proliferative responses to PHA or anti‐CD3 were normal, and BLS T cells primed and restimulated in vitro expressed normal amounts of CD40 ligand. BLS B cells proliferated and produced IgE if stimulated with anti‐CD40 or soluble CD40 ligand and IL‐4. Activation of BLS B cells with soluble CD40 ligand and IL‐4 induced normal expression of activation markers, although MHC class II expression remained absent. Depressed antibody titers, lack of amplification and failure to undergo isotype switching in response to immunization with bacteriophage ϕ × 174 demonstrated defective T cell help. We conclude that BLS B cells are functionally normal if appropriately stimulated, and that the defective humoral immunity observed may be related to diminished expression of CD40 ligand on BLS T cells.
In:
volume:28
In:
number:2
In:
year:2006
In:
pages:589-598
In:
extent:10
In:
European journal of immunology, Weinheim : Wiley-VCH, 1971-, 28, Heft 2 (2006), 589-598 (gesamt 10), 1521-4141
Language:
English
DOI:
10.1002/(SICI)1521-4141(199802)28:02〈589::AID-IMMU589〉3.0.CO;2-J
URN:
urn:nbn:de:101:1-2023120512200987045490
URL:
https://doi.org/10.1002/(SICI)1521-4141(199802)28:02〈589::AID-IMMU589〉3.0.CO;2-J
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2023120512200987045490
URL:
https://d-nb.info/1312225076/34
URL:
https://doi.org/10.1002/(SICI)1521-4141(199802)28:02〈589::AID-IMMU589〉3.0.CO;2-J
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