Revertant T lymphocytes in a patient with Wiskott-Aldrich syndrome: analysis of function and distribution in lymphoid organs.
J Allergy Clin Immunol
; 125(2): 439-448.e8, 2010 Feb.
Article
em En
| MEDLINE
| ID: mdl-20159256
ABSTRACT
BACKGROUND:
The Wiskott-Aldrich syndrome (WAS) is a rare genetic disease characterized by thrombocytopenia, immunodeficiency, autoimmunity, and hematologic malignancies. Secondary mutations leading to re-expression of WAS protein (WASP) are relatively frequent in patients with WAS.OBJECTIVE:
The tissue distribution and function of revertant cells were investigated in a novel case of WAS gene secondary mutation.METHODS:
A vast combination of approaches was used to characterize the second-site mutation, to investigate revertant cell function, and to track their distribution over a 18-year clinical follow-up.RESULTS:
The WAS gene secondary mutation was a 4-nucleotide insertion, 4 nucleotides downstream of the original deletion. This somatic mutation allowed the T-cell-restricted expression of a stable, full-length WASP with a 3-amino acid change compared with the wild-type protein. WASP(+) T cells appeared early in the spleen (age 10 years) and were highly enriched in a mesenteric lymph node at a later time (age 23 years). Revertant T cells had a diversified T-cell-receptor repertoire and displayed in vitro and in vivo selective advantage. They proliferated and produced cytokines normally on T-cell-receptor stimulation. Consistently, the revertant WASP correctly localized to the immunologic synapse and to the leading edge of migrating T cells.CONCLUSION:
Despite the high proportion of functional revertant T cells, the patient still has severe infections and autoimmune disorders, suggesting that re-expression of WASP in T cells is not sufficient to normalize immune functions fully in patients with WAS.
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Base de dados:
MEDLINE
Assunto principal:
Síndrome de Wiskott-Aldrich
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Linfócitos T
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Proteína da Síndrome de Wiskott-Aldrich
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Tecido Linfoide
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article