Abstract
We present the case of a 28-year-old Caucasian female with common variable immunodeficiency (CVID) since age 5 who had a long history of hospitalizations for unexplained fevers and pulmonary infiltrates. The patient developed mild lymphocytosis 7 months prior to our evaluation. Flow cytometry of peripheral blood revealed an expansion of γδ T lymphocytes, mild CD4 T lymphocytopenia, and a reduced CD4/CD8 ratio (0.2). Two subpopulations of γδ T lymphocytes were found (CD3+/CD4−/CD8+, 47%; CD3+/CD4−/CD8−, 53%), the vast majority of which expressed V-δ1. An infectious cause for the patient's γδ T lymphocytosis could not be found. The sputum was chronically colonized with Staphylococcus aureus, and the organism produced TSST-1 in vitro. A bronchoalveolar lavage (BAL) revealed marked lymphocytosis, but γδ T lymphocytes were not overrepresented in the BAL. Lymphocyte functional studies revealed poor proliferative responses to mitogens and staphylococcal superantigens and diminished cytokine production. V-δ1 T lymphocytes from the patient's blood were not expanded in vitro in response to staphylococcal superantigens. TCR gene rearrangement studies confirmed the presence of Jγ and Jβ1 clonal rearrangements accounting for only a small subpopulation of the γδ T lymphocytes. These studies were repeated 5 months later and were unchanged. A bone marrow biopsy was negative for leukemia. Hence, the cause of the patient's γδ T lymphocytosis could not be determined despite evaluation for underlying malignancy, occult infection, or superantigen-driven stimulation. The patient ultimately died of progressive respiratory insufficiency. The state of current knowledge regarding γδ T lymphocytosis, decreased production of αβ T lymphocytes, and a low CD4/CD8 ratio in association with CVID is discussed.
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Katial, R.K., Lieberman, M.M., Muehlbauer, S.L. et al. γδ T Lymphocytosis Associated with Common Variable Immunodeficiency1 . J Clin Immunol 17, 34–42 (1997). https://doi.org/10.1023/A:1027384311897
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DOI: https://doi.org/10.1023/A:1027384311897