Article ; Online: A partial human LCK defect causes a T cell immunodeficiency with intestinal inflammation.
The Journal of experimental medicine
2023 Volume 221, Issue 1
Abstract: Lymphocyte-specific protein tyrosine kinase (LCK) is essential for T cell antigen receptor (TCR ... mediated signal transduction. Here, we report two siblings homozygous for a novel LCK variant (c.1318C>T ... P440S) characterized by T cell lymphopenia with skewed memory phenotype, infant-onset recurrent ...
Abstract | Lymphocyte-specific protein tyrosine kinase (LCK) is essential for T cell antigen receptor (TCR)-mediated signal transduction. Here, we report two siblings homozygous for a novel LCK variant (c.1318C>T; P440S) characterized by T cell lymphopenia with skewed memory phenotype, infant-onset recurrent infections, failure to thrive, and protracted diarrhea. The patients' T cells show residual TCR signal transduction and proliferation following anti-CD3/CD28 and phytohemagglutinin (PHA) stimulation. We demonstrate in mouse models that complete (Lck-/-) versus partial (LckP440S/P440S) loss-of-function LCK causes disease with differing phenotypes. While both Lck-/- and LckP440S/P440S mice exhibit arrested thymic T cell development and profound T cell lymphopenia, only LckP440S/P440S mice show residual T cell proliferation, cytokine production, and intestinal inflammation. Furthermore, the intestinal disease in the LckP440S/P440S mice is prevented by CD4+ T cell depletion or regulatory T cell transfer. These findings demonstrate that P440S LCK spares sufficient T cell function to allow the maturation of some conventional T cells but not regulatory T cells-leading to intestinal inflammation. |
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MeSH term(s) | Infant ; Humans ; Animals ; Mice ; CD28 Antigens ; CD4-Positive T-Lymphocytes ; Immunologic Deficiency Syndromes ; Lymphocyte Specific Protein Tyrosine Kinase p56(lck)/genetics ; Receptors, Antigen, T-Cell/genetics ; Inflammation/genetics ; Lymphopenia/genetics |
Chemical Substances | CD28 Antigens ; Lymphocyte Specific Protein Tyrosine Kinase p56(lck) (EC 2.7.10.2) ; Receptors, Antigen, T-Cell |
Language | English |
Publishing date | 2023-11-14 |
Publishing country | United States |
Document type | Journal Article |
ZDB-ID | 218343-2 |
ISSN | 1540-9538 ; 0022-1007 |
ISSN (online) | 1540-9538 |
ISSN | 0022-1007 |
DOI | 10.1084/jem.20230927 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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