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CD4/Leu7 and CD8/Leu7 large granular lymphocytosis: comparative studies between NK cells and T cells
Insights
Large granular lymphocytes (LGLs) in two patients with indolent lymphocytosis were studied. Both CD4/Leu7 and CD8/Leu7 LGLs showed reduced NK activity and IL-2 production, but differed in immunoglobulin and ADCC influence.
Area of Science:
- Immunology
- Hematology
Background:
- Investigating the functional characteristics of large granular lymphocytes (LGLs) in patients with indolent lymphocytosis.
- Comparing CD4/Leu7 and CD8/Leu7 LGL subsets from two patients with distinct T cell phenotypes.
Observation:
- Both LGL subsets exhibited acid phosphatase positivity and beta-glucuronidase activity in cytoplasmic granules.
- CD4/Leu7 and CD8/Leu7 LGLs demonstrated a lack of Natural Killer (NK) cell activity.
- Reduced Interleukin-2 (IL-2) production and low IL-2 receptor expression were observed in both LGL types, independent of T cell phenotype.
Findings:
- CD4/Leu7 and CD8/Leu7 LGLs influenced immunoglobulin production in vitro differently, correlating with their T cell phenotype.
- Antibody-Dependent Cell-Mediated Cytotoxicity (ADCC) activity varied between the subsets, linked to Fc receptor expression.
- Case 2 LGLs potentially possessed altered Fc receptors, effective for ADCC despite being undetectable by Leu11 antibody.
Implications:
- The study highlights the distinct functional roles of CD4/Leu7 and CD8/Leu7 LGLs in indolent lymphocytosis.
- Understanding these functional differences is crucial for managing patients with large granular lymphocytosis.
- Further research into altered Fc receptor expression in LGLs may reveal new therapeutic targets.
Abstract:
Lymphocytes, co-expressing CD4/Leu7 and CD8/Leu7 markers respectively, taken from two patients having large granular lymphocytosis taking an indolent clinical course have been comparatively studied for function as NK cells and T cells. Both large granular lymphocytes (LGLs) were acid phosphatase positive and showed a beta-glucuronidase reaction in their cytoplasmic granules. Studies on case 1 indicated that the CD4/Leu7 lymphocytosis with LGL morphology takes a benign clinical course with mild neutropenia as well as those of CD8/Leu7 LG lymphocytosis. Both CD4/Leu7 and CD8/Leu7 LGLs behave similarly in their lack of NK activity, and manifest decreased IL-2 production in vitro and show a low IL-2 receptor expression unrelated to their T cell phenotype, but behave differently in influencing the immunoglobulin production in vitro and the ADCC activity, depending on their T cell phenotype and on the expression of Fc receptor, respectively. Furthermore, the altered Fc receptors which were undetectable by the Leul 1 antibody but were still effective for ADCC activity might be present in case 2 LGLs.
