PMID: 6169660Mar 15, 1981Paper

Deficiency of natural killer cell activity in patients with chronic lymphocytic leukemia

International Journal of Cancer. Journal International Du Cancer
H W ZieglerJ Zarling

Abstract

Natural killer (NK)6 cell activity of peripheral blood lymphocytes against human leukemia cell lines was measured in patients with chronic B-cell lymphocytic leukemia (CLL) and age- and sex-matched controls. In order to remove the leukemia cells that interfere with the in vitro assay we (1) isolated lymphocytes that form rosettes with sheep red blood cells (SRBC) or (2) lysed the CLL cells with a monoclonal anti-B cell antibody and complement. NK activity in either lymphocyte preparation from nine of 10 patients with advanced disease was not detectable and, when calculated in terms of lytic units per ml of blood, as at least seven times lower than in controls; only one of these patients exhibited activity within the control range. Two patients with early disease had measurable, but low, NK-cell activity. Prolongation of the NK cell assay from 6 to 18h gave rise to significant killing in the CLL patients lacking NK cell activity in the 6-h assay; however, the activity still was six times lower than in controls. Treatment of leukemia cell-depleted lymphocytes from CLL patients with human fibroblast interferon or the interfeon inducer poly 1:C enhanced NK-cell activity in the two early stage patients but this treatment was ineffec...Continue Reading

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