Objectives: Large granular lymphocyte (LGL) leukemia is a rare type of lymphoproliferative disease caused by clonal antigenic stimulation of T cells and natural killer (NK) cells.
Methods: In this review, we focus on the current knowledge of the immunological dysfunctions associated with LGL leukemia and the associated disorders coexistent with this disease. Novel therapeutic options targeting known molecular mechanisms are also discussed.
Results And Discussion: The pathogenesis of LGL leukemia involves the accumulation of gene mutations, dysregulated signaling pathways and immunological dysfunction. Mounting evidence indicated that dysregulated survival signaling pathways may be responsible for the immunological dysfunction in LGL leukemia including decreased numbers of neutrophils, dysregulated signal transduction of NK cells, abnormal B-cells, aberrant CD8+ T cells, as well as autoimmune and hematological abnormalities.
Conclusion: A better understanding of the immune dysregulation triggered by LGL leukemia will be beneficial to explore the pathogenesis and potential therapeutic targets for this disease.
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http://dx.doi.org/10.1080/10245332.2018.1535294 | DOI Listing |
Intern Med
January 2025
Department of Hematology, Suita Municipal Hospital, Japan.
A 51-year-old woman with persistent proliferation of natural killer (NK) cells in her peripheral blood was diagnosed with NK-large granular lymphocytic leukemia (NK-LGLL). During follow-up, computed tomography revealed multiple infiltrative pulmonary lesions. A flow cytometric analysis of bronchoalveolar lavage fluid showed infiltration of NK cells, resulting in a diagnosis of pulmonary infiltration by NK-LGLL.
View Article and Find Full Text PDFDiscov Oncol
December 2024
Laboratory of Hematology-Oncology, European Institute of Oncology IRCCS, Via Ripamonti 435, 20141, Milan, MI, Italy.
The clinical presentation of T-cell large granular lymphocytic leukemia (T-LGLL) is extremely variable: 30% of patients have neutropenia with no associated symptoms, others present with bacterial infections and sepsis may occur. Tools to predict patient outcome are lacking. Stemming from preliminary results obtained by single cell-RNAseq we investigated by qPCR HSP and IFIT gene families in 27 LGLL patients (23T-LGLL and 4 NK-LGLL), including 11 with neutropenia and/or thrombocytopenia and 16 asymptomatic for the disease.
View Article and Find Full Text PDFArthritis Res Ther
December 2024
Medizinisches Versorgungszentrum Rheumatologie und Autoimmunmedizin Hamburg GmbH, Mönckebergstraße 27, D-20095, Hamburg, Germany.
Background: Clonal T cell populations are frequently detected in patients with rheumatic diseases. The relevance of this finding is often uncertain, as the clinical spectrum can range from being asymptomatic to T cell leukemia. Former studies suggested that certain anti-rheumatic drugs might influence the course of the clonal T cell populations.
View Article and Find Full Text PDFBackground: Chronic NK-cell lymphoproliferative disease (CLPD-NK) is a very rare lymphoproliferative disorder in which patients often have an elevated lymphocyte population without clinical symptoms.
Methods: In this particular case, a middle-aged woman presented with a consistent elevation in her lymphocyte proportion over a span of four consecutive years during physical examinations, without manifesting any other notable clinical symptoms. The underlying cause of this phenomenon was ultimately identified through a comprehensive evaluation that encompassed peripheral blood cell morphology analysis, lymphocyte subset profiling, and peripheral blood immunophenotyping.
Hematology Am Soc Hematol Educ Program
December 2024
Service d'Hématologie Clinique, Centre Hospitalier Universitaire de Rennes, Rennes, France.
Large granular lymphocyte (LGL) leukemia is a rare lymphoproliferative disorder characterized by an expansion of clonal T or natural killer lymphocytes. Neutropenia-related infections and anemia represent the main manifestations. LGL leukemia is frequently associated with autoimmune disorders such as rheumatoid arthritis, Sjögren's syndrome, autoimmune endocrinopathies, vasculitis, or autoimmune cytopenia.
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