Natural killer (NK) cell large granular lymphocyte leukemia

INTRODUCTION

Large granular lymphocyte (LGL) leukemia is characterized by peripheral blood and marrow lymphocytic infiltration with clonal LGLs, splenomegaly, and cytopenias, most commonly neutropenia. LGL leukemia arises most frequently (85 percent) from a T cell lineage or, less commonly (15 percent), from a natural killer (NK) cell lineage [1,2]. The etiology, clinical features, diagnosis, and treatment of natural killer (NK) cell LGL disorders will be discussed here. T cell LGL leukemia is discussed separately. (See "Clinical manifestations, pathologic features, and diagnosis of T cell large granular lymphocyte leukemia" and "Treatment of large granular lymphocyte leukemia".)

THE LARGE GRANULAR LYMPHOCYTE

The large granular lymphocyte (LGL) is a morphologically distinct lymphoid subset comprising 10 to 15 percent of normal peripheral blood mononuclear cells (picture 1). The absolute number of LGLs in the peripheral blood of normal subjects is 200 to 400/microL. LGLs arise from two major lineages:

CD3 positive, CD 57 positive, CD56 negative T cells, representing in vivo antigen-activated cytotoxic effector T cells

CD3-, CD56+ natural killer (NK) cells. It had been postulated that such NK cells mediate non-major histocompatibility complex (MHC)-restricted cytotoxicity. It is now established that NK cells possess specific receptors for MHC class I molecules named "killer-cell Ig-like inhibitory receptor" (KIR) and "killer-cell activating receptor" (KAR). Interactions between these receptors and MHC class I molecules on target cells may inhibit or activate NK cell-mediated cytotoxicity.

Secondary benign (nonclonal) LGL expansions have been reported in the following clinical situations:

                      

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Literature review current through: Jun 2014. | This topic last updated: Apr 16, 2014.
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