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Cancer Immunology, Immunotherapy : CII logoLink to Cancer Immunology, Immunotherapy : CII
. 1990 Jan;31(1):53–59. doi: 10.1007/BF01742496

Addition of interleukin-2in vitro augments detection of lymphokine-activated killer activity generatedin vivo

Jacquelyn A Hank 1,, Gilda Weil-Hillman 1, Jean E Surfus 1, Jeffrey A Sosman 1, Paul M Sondel 1,3,4
PMCID: PMC11038065  PMID: 2306756

Abstract

Thein vivo administration of repetitive weekly cycles of interleukin-2 (IL-2) to patients with cancer enhances the ability of freshly obtained peripheral blood lymphocytes (PBL) to lyse both the natural-killer(NK)-susceptible K562 and the NK-resistant Daudi targets. Lysis of both targets is significantly augmented by inclusion of IL-2 in the medium during the cytotoxicity assay. This boost is much greater for cells obtained following thein vivo IL-2 therapy than for cells obtained prior to the initiation of therapy or for cells from healthy control donors. In addition to direct lytic activity, the PBL obtained followingin vivo IL-2 show a rapid increase in lymphokine-activated killer (LAK) activity with more prolongedin vitro IL-2 exposure, indicating that LAK effectors primedin vivo respond with “secondary-like” kinetics to subsequent IL-2in vitro. Lymphocytes from healthy control individuals, cultured in IL-2 under conditions attempting to simulate thein vivo IL-2 exposure, function similarly to PBL obtained from patients following IL-2, in that low-level LAK activity was significantly boosted by inclusion of IL-2 during the cytotoxic assay and the cells also responded with secondary-like kinetics to subsequent IL-2in vitro. The augmentation of the LAK effect was also dependent on the dose of IL-2 added during the 4-h51Cr-release cytotoxicity assay, with higher doses of IL-2 having a more pronounced effect. While continuous infusion of IL-2 induces a greater cytotoxic potential per milliliter of blood obtained from patients, the peak serum IL-2 levels attained are greater with bolus IL-2 infusions. These pharmacokinetic results, together with the IL-2 dose dependence of LAK activity generatedin vivo shown in this report, suggest that a combination of treatment with bolus IL-2 infusions superimposed on continuous IL-2 infusion may transiently expose IL-2 dependent LAK cells, activatedin vivo, to higher concentrations of IL-2, facilitating theirin vivo cytotoxic potential.

Keywords: Peripheral Blood Lymphocyte, Cytotoxic Potential, Healthy Control Individual, Healthy Control Donor, Daudi Target

Footnotes

This work was supported by NIH contract NO1 CM-47669-02, NIH grants CA-32685, RR-031086, NO1 CM-47669-03, and American Cancer Society grant CH-237

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