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J Allergy Clin Immunol. 2017 Nov;140(5):1394-1403.e8. doi: 10.1016/j.jaci.2016.12.968. Epub 2017 Feb 7.

Cytotoxic T-lymphocyte-associated protein 4-Ig effectively controls immune activation and inflammatory disease in a novel murine model of leaky severe combined immunodeficiency.

Author information

1
VIB Center for Brain & Disease Research, Leuven, Belgium; KU Leuven, Department of Microbiology and Immunology, Leuven, Belgium.
2
GIGA I(3) and Department of Hematology, University of Liege, Liege, Belgium.
3
VIB Center for Brain & Disease Research, Leuven, Belgium; KU Leuven, Department of Microbiology and Immunology, Leuven, Belgium. Electronic address: adrian.liston@vib.be.

Abstract

BACKGROUND:

Severe combined immunodeficiency can be caused by loss-of-function mutations in genes involved in the DNA recombination machinery, such as recombination-activating gene 1 (RAG1), RAG2, or DNA cross-link repair 1C (DCLRE1C). Defective DNA recombination causes a developmental block in T and B cells, resulting in high susceptibility to infections. Hypomorphic mutations in the same genes can also give rise to a partial loss of T cells in a spectrum including leaky severe combined immunodeficiency (LS) and Omenn syndrome (OS). These patients not only experience life-threatening infections because of immunodeficiency but also experience inflammatory/autoimmune conditions caused by the presence of autoreactive T cells.

OBJECTIVE:

We sought to develop a preclinical model that fully recapitulates the symptoms of patients with LS/OS, including a model for testing therapeutic intervention.

METHODS:

We generated a novel mutant mouse (Dclre1cleaky) that develops a LS phenotype. Mice were monitored for diseases, and immune phenotype and immune function were evaluated by using flow cytometry, ELISA, and histology.

RESULTS:

Dclre1cleaky mice present with a complete blockade of B-cell differentiation, with a leaky block in T-cell differentiation resulting in an oligoclonal T-cell receptor repertoire and enhanced cytokine secretion. Dclre1cleaky mice also had inflammatory symptoms, including wasting, dermatitis, colitis, hypereosinophilia, and high IgE levels. Development of a preclinical murine model for LS allowed testing of potential treatment, with administration of cytotoxic T-lymphocyte-associated protein 4-Ig reducing disease symptoms and immunologic disturbance, resulting in increased survival.

CONCLUSION:

These data suggest that cytotoxic T-lymphocyte-associated protein 4-Ig should be evaluated as a potential treatment of inflammatory symptoms in patients with LS and those with OS.

KEYWORDS:

Artemis; Leaky severe combined immunodeficiency; cytotoxic T-lymphocyte-associated protein 4; immune dysregulation; regulatory T cell

PMID:
28185879
DOI:
10.1016/j.jaci.2016.12.968
[Indexed for MEDLINE]
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